FORM 2
THE PATENTS ACT, 1970 (39 of 1970) & THE PATENTS RULES, 2003
COMPLETE SPECIFICATION
(See section 10, rule 13)
1. Title of the invention: COMPOSITION COMPRISING A POLYMER COMPRISING AT
LEAST ONE CATIONIC (METH)ACRYLAMIDE UNIT, A PARTICULAR SILICONE AND A CHEMICAL OXIDIZING AGENT AND/OR AN OXIDATION DYE
2. Applicant(s)

NAME NATIONALITY ADDRESS
L'OREAL French 14, Rue Royale 75008 PARIS, France
3. Preamble to the description
COMPLETE SPECIFICATION
The following specification particularly describes the invention and the manner in which it
is to be performed.

The present invention relates to a cosmetic composition for treating keratin fibres, and in particular human keratin fibres such as hair, which comprises one or more polymers comprising one or more cationic or quaternized acrylamide and/or methacrylamide unit(s), a specific oil-in-water-type silicone emulsion, and one or more chemical oxidizing agent(s) and/or one or more oxidation dye(s).
The invention also relates to a cosmetic treatment process, especially for dyeing and/or lightening keratin fibres using this composition. In particular, the present invention also relates to a particular process for dyeing keratin fibres. The present invention also relates to a particular process for lightening keratin fibres.
The invention also relates to the use of such a composition for dyeing and/or lightening keratin fibres.
Finally, the invention relates to a kit comprising at least two compartments, a first compartment comprising a first composition comprising one or more oxidation dye(s), a second compartment comprising a second composition comprising one or more chemical oxidizing agent(s), one or more polymers comprising one or more cationic or quaternized acrylamide and/or methacrylamide unit(s), being comprised in the first and/or second composition, and a specific oil-in-water-type silicone emulsion being comprised in the first and/or second composition.
It is a known practice to dye and/or lighten keratin fibres, and in particular human hair, with oxidizing compositions or dye compositions containing oxidation dye precursors, which are generally known as “oxidation bases”, in particular ortho- or para-phenylenediamines, ortho- or para-aminophenols and heterocyclic bases.
Oxidation dye precursors are compounds that are initially uncoloured or sparingly coloured, which develop their dyeing power on the hair in the presence of oxidizing agents, leading to the formation of

coloured compounds. The formation of these coloured compounds results either from an oxidative condensation of the “oxidation bases” with themselves, or from an oxidative condensation of the “oxidation bases” with coloration-modifying compounds, or “couplers”, which are generally present in the dye compositions used in oxidation dyeing and are represented more particularly by meta-phenylenediamines, meta-aminophenols, meta-diphenols and certain heterocyclic compounds.
The variety of molecules used, consisting on the one hand of the “oxidation bases” and on the other hand of the “couplers”, allows a very rich palette of colours to be obtained.
But these treatments can damage hair and their cosmetic
properties. So, there is a need to provide to consumers hair dyeing
and/or lightening products that confer good lightening performances
and/or dyeing performances such as intensity, chromaticity, s electivity
with a high level of cosmetic properties of said fibres, such as softness,
smoothness, manageability and disentangling. These cosmetic
properties may also be long-lasting.
The compositions should give satisfactory silicone deposit on the keratin fibres.
The Applicant has now discovered that a cosmetic composition comprising one or more polymers comprising at least one cationic or quaternized (meth)acrylamide unit, a specific oil-in-water-type silicone emulsion, and one or more chemical oxidizing agent and/or one or more oxidation dyes makes it possible to achieve the objectives outlined above.
Thus, the subject of the invention is a cosmetic composition comprising:
a. one or more polymers comprising one or more cationic or
quaternized acrylamide and/or methacrylamide unit(s);
b. an oil-in-water emulsion having D50 particle size of less than
350 nm and comprising:
- a silicone mixture comprising (i) one or more trialkylsilyl terminated dialkylpolysiloxane(s) having a viscosity of from 40,000 to less than 100,000 mPa.s at 25°C and (ii) one or more amino silicone(s)

having a viscosity of from 1,000 to 15,000 mPa.s at 25°C and an amine value of from 2 to 10 mg of KOH per gram of amino silicone,
- a mixture of emulsifiers comprising one or more nonionic emulsifiers, wherein the mixture of emulsifiers has a HLB value of from 10 to 16, and
- water;
c. one or more chemical oxidizing agent and/or one or more
oxidation dyes;
d. optionally one or more cationic polymers different from the
polymers comprising one or more cationic or quaternized acrylamide
and/or methacrylamide unit(s).
This cosmetic composition, when applied on keratin fibres, in particular human keratin fibres such as hair, provides good lightening performances and/or good dyeing performances such as intensity, chromaticity, selectivity, and leads to an improvement of the condition and quality of hair, in terms of hair feel (e.g. smooth feel, soft feel, conditioned feel) and hair manageability (e.g., no or less frizz, styleability/shapeability, combing, detangling, desirable volume) .
This cosmetic composition allows increasing the silicone deposition on hair when compared to a similar composition which does not contain the specific polymer a.
The present invention also relates to a cosmetic treatment process, in particular for dyeing and/or lightening keratin fibres, preferably human keratin fibres such as the hair, using this composition. In particular, the present invention also relates to a particular process for dyeing keratin fibres. The present invention also relates to a particular process for lightening keratin fibres.
Another subject-matter of the invention is the use of the composition according to the invention for dyeing and/or lightening keratin fibres.
The present invention also relates to a kit comprising at least two compartments, a first compartment comprising a first composition comprising one or more oxidation dye(s), a second compartment comprising a second composition comprising one or more chemical

oxidizing agent(s), the first and/or second composition comprising one or more polymers comprising one or more cationic or quaternized acrylamide and/or methacrylamide unit(s) as defined above, and the specific oil-in-water emulsion as defined above.
Other subject-matters, characteristics, aspects and advantages of the invention will emerge even more clearly on reading the description and the example that follows.
In the text herein below, unless otherwise indicated, the limits of a range of values are included in that range, for example in the expressions "between" and "ranging from ... to ...".
Moreover, the expression "at least one" used in the present description is equivalent to the expression "one or more".
Polymer(s) comprising at least one cationic or quaternized (meth)acrylamide unit
The first essential component of the cosmetic composition according to the present invention is one or more polymer(s) comprising one or more cationic or quaternized (meth)acrylamide unit(s). These polymers are non-silicones, i.e. they do not contain any silicon (Si) atom.
Polymers comprising one or more cationic or quaternized (meth)acrylamide unit(s) can be cationic and/or amphoteric polymers.
By “cationic and/or amphoteric polymer(s)”, it is understood one or more cationic polymers, one or more amphoteric polymers or the mixture of one or more cationic polymers, and of one or more amphoteric polymers.
The polymer(s) comprising one or more cationic or quaternized (meth)acrylamide units may be chosen from cationic polymers, amphoteric polymers and mixtures thereof. Most preferably, they are chosen from cationic polymers.
The cationic charge density of the polymers comprising one or more cationic or quaternized (meth)acrylamide units may preferably be lower than or equal to 6 meq/g, more preferentially lower than or equal to 5 meq/g, and better still lower than or equal to 4 meq/g. This cationic

charge density advantageously ranges from 0.5 to 6 meq/g, better still from 1 to 5 meq/g, and even more preferably from 1.5 to 4 meq/g.
The term "cationic polymer" means any polymer comprising cationic groups and/or groups that can be ionized to cationic groups, and not comprising anionic groups and/or groups that can be ionized to anionic groups. Preferably, the cationic polymer is hydrophilic or amphiphilic. The preferred cationic polymers are chosen from those that contain units comprising primary, secondary, tertiary and/or quaternary amine groups that may either form part of the main polymer chain or may be borne by a side substituent directly connected thereto.
The polymers comprising one or more cationic or quaternized (meth)acrylamide units that can be used in the present invention are preferably chosen from homopolymers or copolymers comprising at least one of the units of the following formulae:

in which:
- R1, which may be identical or different, denotes a hydrogen atom or a CH3 radical;
- R, which may be identical or different, denotes a linear or branched C1-C12 alkyl radical, preferably a linear C1-C6 alkyl radical, optionally substituted by one or more hydroxyl radicals;
- R5, R6 and R7, which may be identical or different, denote a linear or branched C1-C18 alkyl radical or a benzyl radical, preferably a linear or branched C1-C6 alkyl radical;

- R8 and R9, which may be identical or different, denote a hydrogen atom or a linear or branched C 1-C6 alkyl radical, preferably methyl or ethyl; and
- Y- denotes an anion derived from a mineral or organic acid or a halide, preferably bromide, chloride, acetate, borate, citrate, tartrate, bisulfate, bisulfite, methosulfate, sulfate or phosphate anion.
The polymers comprising one or more cationic or quaternized
(meth)acrylamide unit(s) may further contain one or more units derived
from comonomers that may be selected from the families of acrylamides,
methacrylamides, diacetone acrylamides, acrylic or methacrylic acids or
esters thereof, vinyllactams such as vinylpyrrolidone or
vinylcaprolactam, and vinyl esters, preferably selected from the families of acrylamide and methacrylamides, and more preferentially acrylamide or methacrylamide.
Among these homo- or co- polymers, mention may be made of:
- homopolymers of acrylamidopropyltrimonium halides, preferable Chloride, such as the product N-DURHANCE A-1000 from ASHLAND,
- copolymers of acrylamidopropyltrimonium halides, preferably chloride and acrylamide, such as the product sold under the name Salcare® SC 60 by the company BASF or sold under the name N-Hance SP 100 or N-Durhance AA2000 by the company Ashland, or the product sold under the name of N-Hance 4572 (ex Aqualon aqua 4572 conditioning polymer) by the company Ashland, that is a mixture of
- guar hydroxypropyltrimonium chloride and of acrylamidepropyl-trimonium chloride/acrylamide copolymer,
- vinylpyrrolidone/methacrylamidopropyldimethylamine copolymers, such as those sold under the name STYLEZE CC 10 by ISP,
- quaternized vinylpyrrolidone/dimethylaminopropylmethacrylamide copolymers such as the product sold under the name GAFQUAT HS 100 by the company ISP.
The polymers comprising one or more cationic or quaternized (meth)acrylamide units that can be used in the present invention can also be chosen from amphoteric polymers.

The term "amphoteric polymer" means any polymer comprising cationic groups and/or groups that can be ionized to cationic groups, and comprising anionic groups and/or groups that can be ionized to anionic groups.
Amphoteric polymers can be chosen more particularly from amphoteric polymers comprising a repetition of:
(i) one or more units derived from a monomer of (meth)acrylamide type,
(ii) one or more units derived from a monomer of
(meth)acrylamidoalkyltrialkylammonium type, and
(iii) one or more units derived from an acidic monomer of (meth)acrylic acid type.
Preferably, the units derived from a monomer of
(meth)acrylamide type (i) are units of structure (VI) below:
)
in which:
- R1 denotes a hydrogen atom or CH3 radical; and
- R2 denotes a NR3R4 radical, wherein R3 and R4, which may be identical or different, denote a hydrogen atom or a linear or branched C1-C12 alkyl radical, optionally substituted by one or more hydroxyl radicals, preferably R2 denotes an amino, a dimethylamino, a tert-butylamino, a dodecylamino or a -NH-CH2OH radical.
Preferably, the said amphoteric polymer comprises a repetition of only one unit of formula (VI).
The unit derived from a monomer of (meth)acrylamide type of formula (VI) in which R1 denotes a hydrogen atom and R2 is an amino radical (NH2) is particularly preferred. It corresponds to the acrylamide monomer per se.
Preferably, the units derived from a monomer of
(meth)acrylamidoalkyltrialkylammonium type (ii) are units of structure (VII) below:


in which:
- R1 denotes a hydrogen atom or CH3 radical;
- R5, R6 and R7, which may be identical or different, denote a linear or branched C1-C6 alkyl radical, preferably a linear or branched C1-C4 alkyl radical;
- n denotes an integer ranging from 1 to 6, preferably from 1 to 4; and
- Y- denotes an anion derived from a mineral or organic acid or a halide, preferably bromide, chloride, acetate, borate, citrate, tartrate, bisulfate, bisulfite, methosulfate, sulfate or phosphate anion.
Preferably, the said amphoteric polymer comprises a repetition of only one unit of formula (VII).
Among these units derived from a monomer of
(meth)acrylamidoalkyltrialkylammonium type of formula (VII), the
ones that are preferred are those derived from the
methacrylamidopropyltrimethylammonium chloride monomer, for
which R1 denotes a methyl radical, n is equal to 3, R 5, R6 and R7 denote a methyl radical, and Y- denotes a chloride anion.
Preferably, the units derived from a monomer of (meth)acrylic acid type (iii) are units of formula (VIII):


in which:
- R1 denotes hydrogen atom or CH3 radical; and
- R2 denotes a hydroxyl radical or a NR3R4 radical, wherein R3 and R4, which may be identical or different, denote a hydrogen atom or a linear or branched C1-C12 alkyl radical optionally substituted by a sulfonic group (-SO3H), preferably R2 denotes a –NH-C(CH3)2-CH2-SO3H radical.
The preferred units of formula (VIII) correspond to the acrylic acid, methacrylic acid and 2-acrylamino-2-methylpropanesulfonic acid monomers.
Preferably, the unit derived from a monomer of (meth)acrylic acid type of formula (VIII) is that derived from acrylic acid, for which R1 denotes a hydrogen atom and R2 denotes a hydroxyl radical.
The acidic monomer(s) of (meth)acrylic acid type may be non-neutralized or partially or totally neutralized with an organic or mineral base.
Preferably, the said amphoteric polymer comprises a repetition of only one unit of formula (VIII).
According to a preferred embodiment of the invention, the amphoteric polymer(s) of this type comprise at least 30 mol% of units derived from a monomer of (meth)acrylamide type (i). Preferably, they comprise from 30 mol% to 70 mol% and more preferably from 40 mol% to 60 mol% of units derived from a monomer of (meth)acrylamide type.
The content of units derived from a monomer of
(meth)acrylamidoalkyltrialkylammonium type (ii) may advantageously be from 10 mol% to 60 mol% and preferentially from 20 mol% to 55 mol%.
The content of units derived from an acidic monomer of (meth)acrylic acid type (iii) may advantageously be from 1 mol% to 20 mol% and preferentially from 5 mol% to 15 mol%.
According to a particularly preferred embodiment of the invention, the amphoteric polymer of this type comprises:
- from 30 mol% to 70 mol% and more preferably from 40 mol% to 60
mol% of units derived from a monomer of (meth)acrylamide type (i),

- from 10 mol% to 60 mol% and preferentially from 20 mol% to 55 mol% of units derived from a monomer of (meth)acrylamidoalkyltrialkylammonium type (ii), and
- from 1 mol% to 20 mol% and preferentially from 5 mol% to 15 mol% of units derived from a monomer of (meth)acrylic acid type (iii).
Amphoteric polymers of this type may also comprise additional
units, other than the units derived from a monomer of (meth)acrylamide
type, of (meth)acrylamidoalkyltrialkylammonium type and of
(meth)acrylic acid type as described above.
However, according to a preferred embodiment of the invention,
the said amphoteric polymers consist solely of units derived from
monomers (i) of (meth)acrylamide type, (ii) of
(meth)acrylamidoalkyltrialkylammonium type and (iii) of (meth)acrylic acid type.
As examples of amphoteric polymers that are particularly
preferred, mention may be made of acrylamide/
methacrylamidopropyltrimethylammonium chloride/ acrylic acid
terpolymers. Such polymers are listed in the CTFA Dictionary (International Cosmetic Ingredient Dictionary) under the name Polyquaternium 53. Corresponding products are especially sold under the names Merquat 2003 and Merquat 2003 PR by the company Nalco.
Another preferred type of amphoteric polymers is the polymer comprising a repetition of:
(i) one or more non ionic units derived from a monomer of (meth)acrylate type,
(ii) one or more units derived from a monomer of
(meth)acrylamidoalkyltrialkylammonium type, and
(iii) one or more units derived from an acidic monomer of (meth)acrylic acid type.
The monomer of (meth)acrylamidoalkyltrialkylammonium type and the acidic monomer of (meth)acrylic acid type (monomers (ii) and (iii) respectively) are as described above.

The non ionic monomers (i) of (meth)acrylate type are preferably chosen from C1-C4 alky acrylates and methacrylates. A preferred monomer is methyl acrylate.
As particularly preferred examples of such amphoteric polymers,
mention may be made of acrylic acid/
methylacrylamidopropyltriméthylammonium chloride/ methyl acrylates terpolymers. Such polymers are listed in the CTFA International Cosmetic Ingredient Dictionary under the name polyquaternium 47. Corresponding products are especially sold under the names Merquat 2001 and Merquat 2001N by the company Nalco.
The polymer(s) comprising one or more cationic or quaternized (meth)acrylamide units are preferably chosen from:
- (meth)acrylamido(C1-C6 alkyl)tri(C1-C4 alkyl) ammonium halide/
(meth)acrylamide copolymers, preferably
(meth)acrylamidopropyltrimonium chloride/ (meth)acrylamide
copolymers, and more preferably acrylamidopropyltrimonium chloride/ acrylamide copolymers,
- (meth)acrylamido(C1-C6 alkyl)tri(C1-C4 alkyl) ammonium halide
/(meth)acrylamide/(meth)acrylic acid terpolymers, preferably (meth)acrylamidopropyltrimonium chloride / (meth)acrylamide / (meth)acrylic acid terpolymers, more preferably acrylamide/ methacrylamidopropyltrimethylammonium chloride/ acrylic acid terpolymers,
- (meth)acrylamido(C1-C6 alkyl)tri(C1-C4 alkyl) ammonium halide/ (C1-C6 alkyl) (meth)acrylate / (meth)acrylic acid terpolymers, preferably (meth)acrylamidopropyltrimonium chloride / (C 1-C6 alkyl) (meth)acrylate / (meth)acrylic acid terpolymers; more preferably acrylic acid/ methylacrylamidopropyltrimethyl-ammonium chloride/ methyl acrylates terpolymers,
- and mixtures thereof.
More preferably, the polymer(s) comprising one or more cationic or quaternized (meth)acrylamide units are preferably chosen from:

- (meth)acrylamido(C1-C6 alkyl)tri(C1-C4 alkyl) ammonium halide/
(meth)acrylamide copolymers, preferably (meth)acrylamide-
propyltrimonium chloride/ (meth)acrylamide copolymers, and most preferably acrylamidopropyltrimonium chloride/ acrylamide copolymers.
The total amount of polymer(s) comprising one or more cationic or quaternized (meth)acrylamide units present in the cosmetic composition of the present invention advantageously ranges from 0.01 to 5% by weight, preferably from 0.015 to 4% by weight, more preferentially from 0.02 to 2% by weight, better still from 0.03 to 1% by weight, and even more preferentially from 0.04 to 0.5% by weight, relative to the total weight of the cosmetic composition. Silicone(s) in the form of an oil-in-water emulsion
The cosmetic composition according to the invention comprises an oil-in-water (or silicone-in-water) emulsion having D50 particle size of less than 350 nm and comprising:
- a silicone mixture comprising (i) a trialkylsilyl terminated
dialkylpolysiloxane having a viscosity of from 40,000 to less than
100,000 mPa.s at 25°C and (ii) an amino silicone having a viscosity of
from 1,000 to 15,000 mPa.s at 25°C and an amine value of from 2 to 10
mg of KOH per gram of amino silicone;
- a mixture of emulsifiers comprising one or more nonionic emulsifiers, wherein the mixture of emulsifiers has a HLB value of from 10 to 16; and
- water.
In the oil-in-water emulsion, or silicone-in-water emulsion, one liquid phase (the dispersed phase) is dispersed in the other liq uid phase (the continuous phase); in the present invention, the silicone mixture, or silicone phase, is dispersed in the continuous aqueous phase.
The silicone mixture comprises one or more trialkylsilyl terminated dialkylpolysiloxanes, that are preferably of formula (IX):
R’3SiO(R’2SiO)pSiR’3 (IX),
wherein:

- R’, identical or different, is a monovalent hydrocarbon radical having from 1 to 18 carbon atoms, preferably from 1 to 6 carbon atoms, even better from 1 to 3 carbon atoms, more preferably methyl, and
- p is an integer of from 500 to 2,000, preferably of from 1,000 to 2,000.
The trialkylsilyl terminated (or end-blocked or α,ω-position) dialkylpolysiloxanes according to the invention have a viscosity of from 40,000 to less than 100,000 mPa.s (100,000 excluded) at 25°C, preferably a viscosity of from 40,000 to 70,000 mPa.s at 25°C, more preferably a viscosity of from 51,000 to 70,000 mPa.s at 25°C.
The trialkylsilyl terminated dialkylpolysiloxanes according to the invention are preferably linear but may contain additionally to the R’2SiO2/2 units (D-units) in formula (IX), RSiO3/2 units (T-units) and/or SiO4/2 units (Q-units), wherein R’, same or different, is a monovalent hydrocarbon radical having from 1 to 18 carbon atoms.
Preferably, R’, identical or different, are alkyl radicals, preferably C1-C18 alkyl radicals, such as the methyl, ethyl, n-propyl, isopropyl, 1-n-butyl, 2-n-butyl, isobutyl, tert-butyl, n-pentyl, isopentyl, neopentyl and tert-pentyl radicals, hexyl radicals, such as the n-hexyl radical, heptyl radicals such as the n-heptyl radical, octyl radicals such as the n-octyl radical and isooctyl radicals, such as the 2,2,4-trimethylpentyl radical, nonyl radicals, such as the n-nonyl radicals, decyl radicals, such as the n-decyl radical, dodecyl radicals, such as the n-dodecyl radical, and octadecyl radicals, such as the n-octadecyl radical; alkenyl radicals such as the vinyl and ally radical; cycloalkyl radicals, such as the cyclopentyl, cyclohexyl, cycloheptyl and methylcyclohexyl radicals; aryl radicals, such as the phenyl, naphthyl, anthryl and phenanthryl radical; alkaryl radicals, such as the o-, m- and p-tolyl radicals, xylyl radicals and ethylphenyl radicals; and aralkyl radicals such as the benzyl radical and the a- and the b-phenylethyl radical. Most preferred is the methyl radical.
Preferably, the trialkylsilyl terminated dialkylpolysiloxanes are trimethylsilyl terminated PDMS (polydimethylsiloxanes or dimethicones).

The silicone mixture comprises one or more amino silicones, that are preferably of formula (X):
XR2Si(OSiAR)n(OSiR2)mOSiR2X (X), wherein:
- R, identical or different, is a monovalent hydrocarbon radical having from 1 to 18 carbon atoms, preferably from 1 to 6 carbon atoms, even better from 1 to 3 carbon atoms, more preferably methyl;
- X, identical or different, is R or a hydroxyl (OH) or a C1-C6-alkoxy group; preferably X is R, i.e. a monovalent hydrocarbon radical having from 1 to 18 carbon atoms, preferably from 1 to 6 carbon atoms, even better from 1 to 3 carbon atoms, more preferably methyl;
- A is an amino radical of the formula -R1-[NR2-R3-]xNR22, or the protonated amino forms of said amino radical, wherein R1 is a C1-C6-alkylene radical, preferably a radical of the formula -CH2CH2CH2-or -CH2CH(CH3)CH2-, R2, same or different, is a hydrogen atom or a C1-C4-alkyl radical, preferably a hydrogen atom, R3 is a C1-C6-alkylene radical, preferably a radical of the formula -CH2CH2-, and x is 0 or 1; and
- m+n is an integer from 50 to about 1000, preferably from 50 to 600.
Preferably, A is an amino radical of the formula -R1-[NR2-R3-]xNR22, or the protonated amino forms of said amino radical, wherein R1 is -CH2CH2CH2- or -CH2CH(CH3)CH2-, R2 are hydrogen atoms, R3 is -CH2CH2-, and x is 1.
Preferably, R, identical or different, are alkyl radicals, preferably C1-C18 alkyl radicals, such as the methyl, ethyl, n-propyl, isopropyl, 1-n-butyl, 2-n-butyl, isobutyl, tert-butyl, n-pentyl, isopentyl, neopentyl and tert-pentyl radicals, hexyl radicals, such as the n-hexyl radical, heptyl radicals such as the n-heptyl radical, octyl radicals such as the n-octyl radical and isooctyl radicals, such as the 2,2,4 -trimethylpentyl radical, nonyl radicals, such as the n-nonyl radicals, decyl radicals, such as the n-decyl radical, dodecyl radicals, such as the n-dodecyl radical, and octadecyl radicals, such as the n-octadecyl radical; alkenyl radicals such as the vinyl and ally radical; cycloalkyl

radicals, such as the cyclopentyl, cyclohexyl, cycloheptyl and methylcyclohexyl radicals; aryl radicals, such as the phenyl, naphthyl, anthryl and phenanthryl radical; alkaryl radicals, such as the o -, m- and p-tolyl radicals, xylyl radicals and ethylphenyl radicals; and aralkyl radicals such as the benzyl radical and the a- and the b-phenylethyl radical. Most preferred is the methyl radical.
The amino silicones according to the invention have a viscosity of from 1,000 to 15,000 mPa.s at 25°C, preferably of from 1,500 to 15,000 mPa.s.
The amino silicones according to the invention have an amine value of from 2 to 10 mg of KOH per gram of amino silicone, preferably of from 3.5 to 8 mg.
The mole percent of amine functionality is preferably in the range of from about 0.3 to about 8%.
Examples of amino silicones useful in the silicone mixture according to the invention include trialkylsilyl terminated amino silicone.
Most preferably, amino silicones are trimethylsilyl terminated aminoethylaminopropylmethylsiloxane, most preferably trimethylsilyl terminated aminoethylaminopropylmethylsiloxane - dimethylsiloxane copolymers. The amino radical A can be protonated partially or fully by adding acids to the amino silicone, wherein the salt forms of the amino radical are obtained. Examples of acids are carboxylic acids with 3 to 18 carbon atoms which can be linear or branched, such as formic acid, acetic acid, propionic acid, butyric acid, pivalic acid, sorbic acid, benzoic acid, salicylic acid. The acids are preferably used in amounts of from 0.1 to 2.0 mol per 1 mol of amino radical A in the amino silicone of formula (X).
The silicone mixture preferably comprises (i) one or more trialkylsilyl terminated dialkylpolysiloxanes having a viscosity of from 40,000 to less than 100,000 mPa.s at 25°C in a quantity of from 70 to 90% by weight, preferably from 75 to 85% by weight, relative to the total weight of the silicone mixture, and (ii) one or more amino silicones having a viscosity of from 1,000 to 15,000 mPa.s at 25°C and an amine

value of from 2 to 10 mg of KOH per gram of amino silicone, in a quantity of from 10 to 30% by weight, preferably from 15 to 25% by weight, relative to the total weight of the silicone mixture.
The oil-in-water emulsion further comprises a mixture of emulsifiers that comprises one or more nonionic emulsifiers. It could optionally comprise one or more cationic surfactants.
The mixture of emulsifiers has a HLB value from 10 to 16.
The nonionic emulsifiers can be chosen among the nonionic surfactants as described hereunder.
Mention may be made of alcohols, α-diols and
(C1-20)alkylphenols, these compounds being polyethoxylated and/or polypropoxylated and/or polyglycerolated, the number of ethylene oxide and/or propylene oxide groups possibly ranging from 1 to 100, and the number of glycerol groups possibly ranging from 2 to 30 ; or alternatively these compounds comprising at least one fatty chain comprising from 8 to 30 carbon atoms and especially from 16 to 30 carbon atoms.
Mention may also be made of condensates of ethylene oxide and
of propylene oxide with fatty alcohols; polyethoxylated fatty amides
preferably having from 2 to 30 ethylene oxide units, polyglycerolated
fatty amides comprising on average from 1 to 5, and in particular from
1.5 to 4, glycerol groups; ethoxylated fatty acid esters of sorbitan
preferably containing from 2 to 40 ethylene oxide units, fatty acid esters
of sucrose, polyoxyalkylenated and preferably polyoxyethylenated fatty
acid esters containing from 2 to 150 mol of ethylene oxide, including
oxyethylenated plant oils, N-(C6-24 alkyl)glucamine derivatives, amine
oxides such as (C10-14 alkyl)amine oxides or N-(C10-14
acyl)aminopropylmorpholine oxides.
Mention may also be made of nonionic surfactants of alkyl(poly)glycoside type, represented especially by the following general formula:
R1O-(R2O)t-(G)v, in which:

- R1 represents a linear or branched alkyl or alkenyl radical comprising 6 to 24 carbon atoms and especially 8 to 18 carbon atoms, or an alkylphenyl radical whose linear or branched alkyl radical comprises 6 to 24 carbon atoms and especially 8 to 18 carbon atoms;
- R2 represents an alkylene radical comprising 2 to 4 carbon atoms,
- G represents a sugar unit comprising 5 to 6 carbon atoms,
- t denotes a value ranging from 0 to 10 and preferably 0 to 4,
- v denotes a value ranging from 1 to 15 and preferably 1 to 4.
Preferably, the alkylpolyglycoside surfactants are compounds of the formula described above in which:
- R1 denotes a linear or branched, saturated or unsaturated alkyl radical comprising from 8 to 18 carbon atoms,
- R2 represents an alkylene radical comprising 2 to 4 carbon atoms,
- t denotes a value ranging from 0 to 3 and preferably equal to 0,
- G denotes glucose, fructose or galactose, preferably glucose;
- the degree of polymerization, i.e. the value of v, possi bly ranging from 1 to 15 and preferably from 1 to 4; the mean degree of polymerization more particularly being between 1 and 2.
The glucoside bonds between the sugar units are generally of 1-6 or 1-4 type and preferably of 1-4 type. Preferably, the alkyl(poly)glycoside surfactant is an alkyl(poly)glucoside surfactant. C8/C16 alkyl(poly)glycosides 1,4, and especially decyl glucosides and caprylyl/capryl glucosides, are most particularly preferred.
Among the commercial products, mention may be made of the products sold by the company COGNIS under the names PLANTAREN® (600 CS/U, 1200 and 2000) or PLANTACARE® (818, 1200 and 2000); the products sold by the company SEPPIC under the names ORAMIX CG 110 and ORAMIX NS 10; the products sold by the company BASF under the name LUTENSOL GD 70, or else the products sold by the company CHEM Y under the name AG10 LK.
The nonionic emulsifiers can preferably be chosen among ethoxylated aliphatic alcohols, polyoxyethylene surfactants, carboxylic esters, polyethylene glycol esters, sorbitol ester and their ethoxylated

derivatives, glycol esters of fatty acids, carboxylic amides, monoalkanolamine condensates, polyoxyethylene fatty acid amides.
Preferably, nonionic emulsifiers are selected from: (i) polyoxyalkylene alkyl ethers, especially (poly)ethoxylated fatty alcohols of formula:
R3-(OCH2CH2)cOH, with:
- R3 representing a linear or branched C 8-C40 alkyl or alkenyl group, preferably C8-C30 alkyl or alkenyl group, optionally substituted with one or more hydroxyl groups, and
- c being an integer between 1 and 200 inclusive, preferentially between 2 and 150 and more particularly between 4 and 50, most preferably between 8 and 20.
The (poly)ethoxylated fatty alcohols are more particularly fatty alcohols comprising from 8 to 22 carbon atoms, oxyethylenated with 1 to 30 mol of ethylene oxide (1 to 30 OE);
(ii) polyoxyalkylene (C8-C32)alkylphenyl ethers,
(iii) polyoxyalkylene sorbitan (C8-C32) fatty acid esters, especially polyethoxylated fatty acid esters of sorbitan preferably containing from 2 to 40 ethylene oxide units, most preferably from 2 to 20 ethylene oxide units; preferably polyoxyethylenated sorbitan (C 10-C24) fatty acid esters preferably containing from 2 to 40 ethylene oxide units, most preferably from 2 to 20 ethylene oxide units; and
(iv) polyoxyethylenated (C8-C32) fatty acid esters containing for example from 2 to 150 mol of ethylene oxide; preferably polyoxyethylenated (C10-C24) fatty acid esters containing for example from 2 to 150 mol of ethylene oxide.
Preferably, the nonionic emulsifiers could be selected from alkyl ether of polyalkyleneglycol and alkyl esters of polyalkyleneglycol; preferably of polyethyleneglycol (PEG).
Some useful emulsifiers are:
- polyethyleneglycol octyl ether; polyethyleneglycol lauryl
ether; polyethyleneglycol tridecyl ether; polyethyleneglycol cetyl ether;

polyethyleneglycol stearyl ether; among these, mention may be made more particularly of trideceth-3, trideceth-10 and steareth-6.
- polyethyleneglycol nonylphenyl ether; polyethyleneglycol
dodecylphenyl ether; polyethyleneglycol cetylphenyl ether;
polyethyleneglycol stearylphenyl ether;
- polyethyleneglycol sorbitan monostearate, polyethyleneglycol
sorbitan monooleate.
- polyethyleneglycol stearate, and especially PEG-100 stearate.
Most preferably, the nonionic emulsifiers are chosen among
steareth-6, PEG-100 stearate, trideceth-3 and trideceth-10 and their mixture; preferably, all these emulsifiers are present in the mixture of emulsifiers.
The mixture of emulsifiers could comprise one or more cationic emulsifiers that could be selected among tetraalkylammonium halides, tetraarylammonium halides, tetraalkylarylammonium halides, and their salts; quaternary ammonium compounds including salts; preferably, the cationic emulsifiers could be chosen among cetrimonium halides or behentrimonium halides, such as chloride.
The oil-in-water emulsion preferably comprises the mixture of emulsifiers in a total amount of from 5 to 15% by weight, preferably of from 8 to 15% by weight, most preferably of from 10 to 12% by weight, relative to the total weight of the emulsion.
The oil-in-water emulsion preferably comprises nonionic emulsifiers in a total amount of from 5 to 15% by weight, preferably of from 8 to 15% by weight, most preferably of from 10 to 12% by weight, relative to the total weight of the emulsion.
The oil-in-water emulsion preferably comprises cationic emulsifiers, when present, in a total amount of from 0.5 to 1.5% by weight, relative to the total weight of the emulsion.
The oil-in-water emulsion preferably comprises the silicone mixture in a total amount of from 40 to 60% by weight, preferably of from 45 to 55% by weight, relative to the total weight of the emulsion.
The oil-in-water emulsion preferably comprises the trialkylsilyl terminated dialkylpolysiloxane(s) in a total amount of from 35 to 45%

by weight, preferably of from 38-42% by weight, relative to the total weight of the emulsion.
The oil-in-water emulsion preferably comprises the amino silicone(s) in a total amount of from 5 to 15% by weight, preferably of from 8-12% by weight, relative to the total weight of the emulsion.
The oil-in-water emulsion comprises water preferably in an amount of from 25 to 50% by weight, preferably of from 30 to 45% by weight, most preferably of from 35 to 42% by weight, relative to the total weight of the emulsion.
The oil-in-water emulsion could additionally comprise a biocide, such as phenoxyethanol, that could be present in the emulsion in a quantity of from 0.5 to 1% by weight, relative to the total weight of the emulsion.
A method of preparation of the oil-in-water emulsion preferably comprises:
- a step of mixing one or more trialkylsilyl terminated
dialkylpolysiloxanes of viscosity of from 40,000 to less than
100,000 mPa.s at 25°C and one or more amino silicones of viscosity of
from 1,000 to 15,000 mPa.s at 25°C and an amine value of from 2 to 10
mg of KOH per gram of amino silicone, at a temperature of from 15°C
to 40°C, preferably at 25°C, to obtain a mixed silicone fluid, then
- a step of adding a mixture of emulsifiers comprising one or
more nonionic emulsifiers, wherein the mixture of emulsifiers has a
HLB value from 10 to 16, to the mixed silicone fluid to obtain a silicone-
emulsifier-mixture, then
- a step of homogenizing the silicone-emulsifier-mixture
followed by
- a step of adding, preferably step-wise, water, preferably
demineralized water, to obtain an oil-in-water emulsion having D50
particle size of less than 350 nm.
The method of preparation of the oil-in-water emulsion could further comprise an additional step of adding a biocide. Biocide could be added for preserving the emulsion against microbial contamination. The biocide could be added at the level of for preserving emulsion

against microbial contamination and obtaining the said emulsion. The quantity of the biocide depends on the type of biocide and as recommended by the manufacturer.
The preparation of the mixture of emulsifiers could be made by mixing one or more nonionic emulsifiers.
The pH of the oil-in-water emulsion after neutralization (i.e. after addition of the biocide) is preferably of from 4 to 6.
The oil-in-water emulsion has D50 particle size of less than 350 nm, preferably of from 100 to 300 nm, more preferably from 150 to 250 nm, more preferably from 150 to 225 nm, and most preferably from 160 to 200 nm. It corresponds to the average hydrodynamic particle diameter. The D50 particle size is expressed in volume. The D50 particle size could be measured by using a device ZetaSizer from Malvern, UK, model Nano-ZS, which is based on the Photon Correlation Spectroscopy (PCS) method.
Particle size measurement
Emulsion particle size is measured by using a device ZetaSizer from Malvern, UK, model Nano-ZS which is based on the Photon Correlation Spectroscopy (PCS) method. The D50 value of particle size (average hydrodynamic particle diameter) is measured, wherein the evaluating algorithm is “cumulants analysis”.
Take 0.5 g of the emulsion sample in a 250 ml beaker, 100 ml of demineralized water is poured into it and then mixed properly to get the sample test solution. The sample test solution is poured in the cuvette cell and is put into the slot of the instrument to measure the particle size of the emulsion. D50 is defined as the value of the particle diameter at 50% in the cumulative distribution. For example, if D50=170 nm, then 50% of the particles in the sample are larger than 170 nm, and 50% smaller than 170 nm or about 50% by volume of all droplets in said emulsion is 170 nm.

Viscosity measurement
The viscosity, especially of the silicones or of the emulsion, is measured at 25°C, at atmospheric pressure .
For viscosities between 1000 to 40,000 mPa.s at 25ºC: the viscosity could be measured with an Anton Paar Rheometer; model MCR101, geometry single gap cylinder: CC27 spindle and shear rate of 1 s-1 for 2 minutes, at 25°C.
For viscosities between 40,000 to 100,000 mPa.s at 25ºC: the viscosity could be measured with an Anton Paar Rheometer; model MCR101, 25-6 cone (Cone-plate geometry: 25 mm dia. / 6° cone); the “Zero gap” setting being made and with a shear rate of 1 s-1 for 2 minutes, at 25°C.
Three measurements are made for each sample and the viscosity value is taken at 60 seconds. MCR Rheometer Series products work as per USP (US Pharmacopeia Convention) 912 – Rotational Rheometer methods.
Amine value measurement
The amine value is determined by acid-base titration using a potentiometer [Make: Veego; Model: VPT-MG]. 0.6 g of sample is taken in a 500 ml beaker and a toluene-butanol 1:1 mixture is added and stirred to mix the sample thoroughly; then the sample solution is titrated with a 0.1(N) HCl solution. A determination of the blank value with the toluene-butanol 1:1 mixture is also done. The calculation of the amine value is done by the above mentioned potentiometer.
The amine value is calculated according to the formula:
56.11 × (V - V Blank) × N / W mg KOH/ g of sample, where V= Volume of HCl required in ml, VBlank= Volume of HCl for blank value (without sample) with the toluene-butanol 1:1 mixture in ml; N= Normality of HCl, i.e. 0.1 N, W= weight of the sample taken in gram.
HLB Value

The term HLB is well known to those skilled in the art, and denotes the hydrophilic-lipophilic balance of a surfactant or emulsifier. In the present invention, HLB values refer to the values at 25°C.
The HLB can be measured by experimental determination or can be calculated.
Calculation of HLB value of nonionic surfactants is calculated according to the equation: HLB = (E + P)/5, with E being the weight percentage of oxyethylenecontent and P being the weight percentage of polyhydric alcohol content, described in to the publication Griffin, J. Soc. Cosm. Chem. 1954 (vol.5, n°4), pp.249-256.
It can also experimentally be determined according to the book of F. Puisieux and M. Seiller, entitled "Galenica 5: Les systèmes disperses - Tome I - Agents de surface et émulsions - Chapitre IV -Notions de HLB et de HLB critique, pp.153-194 - paragraph 1.1.2. Determination de HLB par voie experimentale [Experimental determination of HLB], pp.164-180".
The calculated HLB is the preferred HLB values that should be taken into account.
Said calculated HLB could be defined as being the following:
“calculated HLB = 20 × molar mass of the hydrophilic part/total molar mass.”
For an oxyethylenated fatty alcohol, the hydrophilic part corresponds to the oxyethylene units condensed onto the fatty alcohol and the “calculated HLB” then corresponds to the “Griffin HLB” as defined hereabove.
For an ester or an amide, the hydrophilic part is naturally defined as being beyond the carbonyl group, starting from the fatty chain(s).
For ionic surfactants/emulsifiers, the HLB value of individual
surfactant/emulsifier can be calculated applying the Davies formula as
described in Davies JT (1957), "A quantitative kinetic theory of
emulsion type, I. Physical chemistry of the emulsifying agent",
Gas/Liquid and Liquid/Liquid Interface (Proceedings of the
International Congress of Surface Activity): 426-438.

According to the formula, the HLB is derived by summing the hydrophilic/hydrophobic contribution afforded by the structural components of the emulsifier: HLB = (hydrophilic groups numbers) – n(group number per CH2 group) +7.
Approximate HLB values for some cationic emulsifiers are given in Table IV, in “Cationic emulsifiers in cosmetics”, GODFREY, J. Soc. Cosmetic Chemists (1966) 17, pp17-27.
When two emulsifiers A and B of known HLB are blended for use, the HLBMix is said to be the required HLB for the mixture. This is expressed by the equation (WAHLBA + WBHLBB)/ (WA + WB) = HLBMix, where WA = the amount (weight) of the first emulsifier (A) used, and WB = the amount (weight) of the second emulsifier (B); HLBA, HLBB = the assigned HLB values for emulsifiers A and B; HLB Mix = the HLB of the mixture.
Said oil-in-water emulsion is for example described in WO 2017/108824.
The cosmetic composition according to the invention may comprise the oil-in-water emulsion b in an amount ranging from 0.1% to 20% by weight, preferably from 0.3 % to 10% by weight and better still from 0.4% to 10% by weight, better from 0.5 to 8%, even more preferentially from 1 to 5% by weight relative to the total weight of the composition.
The composition according to the invention preferably comprises the trialkylsilyl terminated dialkylpolysiloxane(s) having a viscosity of from 40,000 to less than 100,000 mPa.s at 25°C in a total amount ranging from 0.05 % to 8% by weight, more preferably from 0.1 % to 5% by weight, even more preferably from 0.2 % to 4% by weight, better from 0,3 to 3% by weight, relative to the total weight of the composition.
The composition according to the invention preferably comprises the amino silicone(s) having a viscosity of from 1,000 to 15,000 mPa.s at 25°C and an amine value of from 2 to 10 mg of KOH per gram of amino silicone, in a total amount ranging from 0.01% to 5% by weight,

more preferably from 0.05 % to 3% by weight, even more preferably from 0.075 % to 2% by weight, better from 0.1 to 1% by weight, relative to the total weight of the composition.
The composition according to the invention comprises one or more chemical oxidizing agent and/or one or more oxidation dyes.
Chemical oxidizing agent
The term "chemical oxidizing agent" is intended to mean an oxidizing agent other than atmospheric oxygen.
Preferably, the chemical oxidizing agent(s) is (are) selected from hydrogen peroxide, urea peroxide, alkali metal bromates, persalts such as perborates and persulphates, in particular sodium persulphate, potassium persulphate and ammonium persulphate, peracids and oxidase enzymes (with possible co-factors) such as peroxidases, 2-electron oxidoreductases such as uricases and 4-electron oxygenases such as laccases, and mixtures thereof.
More preferably, the chemical oxidizing agent(s) is (are) selected from hydrogen peroxide, persalts, and mixtures thereof, and better still is hydrogen peroxide.
When it is present in the cosmetic composition according to the present invention, said chemical oxidizing agent advantageously is present in an amount ranging from 0.1% to 20% by weight, preferably from 0.5% to 15% by weight, more preferably from 1% to 15% by weight, better still from 2% to 10% by weight, relative to the total weight of the cosmetic composition.
When it is present in the cosmetic composition according to the present invention, hydrogen peroxide advantageously is present in an amount ranging from 0.1 % to 20% by weight, preferably from 0,5% to 15% by weight, more preferably from 1% to 15% by weight, still better from 2% to 10% by weight relative to the total weight of the cosmetic composition.
Oxidation dyes

The oxidation dyes may be chosen from one or more oxidation bases, optionally in combination with one or more couplers. Preferably, the oxidation dyes comprise at least one oxidation base and at least one coupler.
By way of example, the oxidation bases are chosen from para-phenylenediamines, bis(phenyl)alkylenediamines, para-aminophenols, ortho-aminophenols and heterocyclic bases, and addition salts thereof.
Among the para-phenylenediamines, examples that may be
mentioned include para-phenylenediamine, para-tolylenediamine, 2-
chloro-para-phenylenediamine, 2,3-dimethyl-para-phenylenediamine,
2,6-dimethyl-para-phenylenediamine, 2,6-diethyl-para-
phenylenediamine, 2,5-dimethyl-para-phenylenediamine, N,N-
dimethyl-para-phenylenediamine, N,N-diethyl-para-phenylenediamine,
N,N-dipropyl-para-phenylenediamine, 4-amino-N,N-diethyl-3-
methylaniline, N,N-bis(β-hydroxyethyl)-para-phenylenediamine, 4-
N,N-bis(β-hydroxyethyl)amino-2-methylaniline, 4-N,N-bis(β-
hydroxyethyl)amino-2-chloroaniline, 2-β-hydroxyethyl-para-
phenylenediamine, 2-fluoro-para-phenylenediamine, 2-isopropyl-para-
phenylenediamine, N-(β-hydroxypropyl)-para-phenylenediamine, 2-
hydroxymethyl-para-phenylenediamine, N,N-dimethyl-3-methyl-para-
phenylenediamine, N,N-(ethyl-β-hydroxyethyl)-para-
phenylenediamine, N-(β,γ-dihydroxypropyl)-para-phenylenediamine,
N-(4'-aminophenyl)-para-phenylenediamine, N-phenyl-para-
phenylenediamine, 2-β-hydroxyethyloxy-para-phenylenediamine, 2-β-
acetylaminoethyloxy-para-phenylenediamine, N-(β-methoxyethyl)-
para-phenylenediamine, 4-aminophenylpyrrolidine, 2-thienyl-para-phenylenediamine, 2-β-hydroxyethylamino-5-aminotoluene and 3-hydroxy-1-(4'-aminophenyl)pyrrolidine, and the addition salts thereof with an acid.
Among the para-phenylenediamines mentioned above, para-
phenylenediamine, para-tolylenediamine, 2-isopropyl-para-
phenylenediamine, 2-β-hydroxyethyl-para-phenylenediamine, 2-β-
hydroxyethyloxy-para-phenylenediamine, 2,6-dimethyl-para-
phenylenediamine, 2,6-diethyl-para-phenylenediamine, 2,3-dimethyl-

para-phenylenediamine, N,N-bis(β-hydroxyethyl)-para-
phenylenediamine, 2-chloro-para-phenylenediamine and 2-β-acetylaminoethyloxy-para-phenylenediamine, and the addition salts thereof with an acid, are particularly preferred.
Among the bis(phenyl)alkylenediamines, examples that may be
mentioned include N,N'-bis(β-hydroxyethyl)-N,N'-bis(4'-
aminophenyl)1,3-diaminopropanol, N,N'-bis(β-hydroxyethyl)-N,N'-
bis(4'-aminophenyl)ethylenediamine, N,N'-bis(4-
aminophenyl)tetramethylenediamine, N,N'-bis(β-hydroxyethyl)-N,N'-
bis(4-aminophenyl)tetramethylenediamine, N,N'-bis(4-
methylaminophenyl)tetramethylenediamine, N,N'-bis(ethyl)-N,N'-
bis(4'-amino-3'-methylphenyl)ethylenediamine, 1,8-bis(2,5-
diaminophenoxy)-3,6-dioxaoctane and the addition salts thereof.
Among the para-aminophenols, examples that may be mentioned
include para-aminophenol, 4-amino-3-methylphenol, 4-amino-3-
fluorophenol, 4-amino-3-chlorophenol, 4-amino-3-
hydroxymethylphenol, 4-amino-2-methylphenol, 4-amino-2-
hydroxymethylphenol, 4-amino-2-methoxymethylphenol, 4-amino-2-aminomethylphenol, 4-amino-2-(β-hydroxyethylaminomethyl)phenol and 4-amino-2-fluorophenol, and the addition salts thereof with an acid.
Among the ortho-aminophenols, examples that may be mentioned include 2-aminophenol, 2-amino-5-methylphenol, 2-amino-6-methylphenol and 5-acetamido-2-aminophenol, and addition salts thereof.
Among the heterocyclic bases, examples that may be mentioned include pyridine derivatives, pyrimidine derivatives and pyrazole derivatives.
Among the pyridine derivatives, mention may be made of the compounds described for example in patents GB 1 026 978 and GB 1 153 196, for instance 2,5-diaminopyridine, 2-(4-methoxyphenyl)amino-3-aminopyridine and 3,4-diaminopyridine, and addition salts thereof.
Other pyridine oxidation bases that are useful in the present invention are the 3-aminopyrazolo[1,5-a]pyridine oxidation bases or addition salts thereof described, for example, in patent application FR

2 801 308. Examples that may be mentioned include pyrazolo[1,5-
a]pyrid-3-ylamine, 2-(acetylamino)pyrazolo[1,5-a]pyrid-3-ylamine, 2-
(morpholin-4-yl)pyrazolo[1,5-a]pyrid-3-ylamine, 3-aminopyrazolo[1,5-
a]pyridine-2-carboxylic acid, 2-methoxypyrazolo[1,5-a]pyrid-3-
ylamine, (3-aminopyrazolo[1,5-a]pyrid-7-yl)methanol, 2-(3-
aminopyrazolo[1,5-a]pyrid-5-yl)ethanol, 2-(3-aminopyrazolo[1,5-
a]pyrid-7-yl)ethanol, (3-aminopyrazolo[1,5-a]pyrid-2-yl)methanol, 3,6-
diaminopyrazolo[1,5-a]pyridine, 3,4-diaminopyrazolo[1,5-a]pyridine,
pyrazolo[1,5-a]pyridine-3,7-diamine, 7-(morpholin-4-yl)pyrazolo[1,5-
a]pyrid-3-ylamine, pyrazolo[1,5-a]pyridine-3,5-diamine, 5-(morpholin-
4-yl)pyrazolo[1,5-a]pyrid-3-ylamine, 2-[(3-aminopyrazolo[1,5-a]pyrid-
5-yl)(2-hydroxyethyl)amino]ethanol, 2-[(3-aminopyrazolo[1,5-a]pyrid-
7-yl)(2-hydroxyethyl)amino]ethanol, 3-aminopyrazolo[1,5-a]pyridin-5-
ol, 3-aminopyrazolo[1,5-a]pyridin-4-ol, 3-aminopyrazolo[1,5-
a]pyridin-6-ol, 3-aminopyrazolo[1,5-a]pyridin-7-ol and the addition
salts thereof.
Among the pyrimidine derivatives, mention may be made of the
compounds described, for example, in patents DE 2359399, JP 88-
169571, JP 05-63124 and EP 0770375 or patent application WO
96/15765, such as 2,4,5,6-tetraaminopyrimidine, 4-hydroxy-2,5,6-
triaminopyrimidine, 2-hydroxy-4,5,6-triaminopyrimidine, 2,4-
dihydroxy-5,6-diaminopyrimidine, 2,5,6-triaminopyrimidine and the
addition salts thereof, and the tautomeric forms thereof, when a
tautomeric equilibrium exists.
Among the pyrazole derivatives, mention may be made of the
compounds described in the patents DE 3843892, DE 4133957 and
patent applications WO 94/08969, WO 94/08970, FR-A-2 733 749 and
DE 195 43 988, such as 4,5-diamino-1-methylpyrazole, 4,5-diamino-1-
(β-hydroxyethyl)pyrazole, 3,4-diaminopyrazole, 4,5-diamino-1-(4'-
chlorobenzyl)pyrazole, 4,5-diamino-1,3-dimethylpyrazole, 4,5-
diamino-3-methyl-1-phenylpyrazole, 4,5-diamino-1-methyl-3-
phenylpyrazole, 4-amino-1,3-dimethyl-5-hydrazinopyrazole, 1-benzyl-
4,5-diamino-3-methylpyrazole, 4,5-diamino-3-tert-butyl-1-
methylpyrazole, 4,5-diamino-1-tert-butyl-3-methylpyrazole, 4,5-

diamino-1-(β-hydroxyethyl)-3-methylpyrazole, 4,5-diamino-1-ethyl-3-
methylpyrazole, 4,5-diamino-1-ethyl-3-(4'-methoxyphenyl)pyrazole,
4,5-diamino-1-ethyl-3-hydroxymethylpyrazole, 4,5-diamino-3-
hydroxymethyl-1-methylpyrazole, 4,5-diamino-3-hydroxymethyl-1-
isopropylpyrazole, 4,5-diamino-3-methyl-1-isopropylpyrazole, 4-
amino-5-(2'-aminoethyl)amino-1,3-dimethylpyrazole, 3,4,5-
triaminopyrazole, 1-methyl-3,4,5-triaminopyrazole, 3,5-diamino-1-
methyl-4-methylaminopyrazole, 3,5-diamino-4-(β-hydroxyethyl)amino-
1-methylpyrazole, and the addition salts thereof. Use may also be made
of 4,5-diamino-1-(β-methoxyethyl)pyrazole.
A 4,5-diaminopyrazole will preferably be used, and even more preferentially 4,5-diamino-1-(β-hydroxyethyl)pyrazole and/or a salt thereof.
Pyrazole derivatives that may also be mentioned include
diamino-N,N-dihydropyrazolopyrazolones and especially those
described in patent application FR-A-2 886 136, such as the following
compounds and the addition salts thereof: 2,3-diamino-6,7-dihydro-
1H,5H-pyrazolo[1,2-a]pyrazol-1-one, 2-amino-3-ethylamino-6,7-
dihydro-1H,5H-pyrazolo[1,2-a]pyrazol-1-one, 2-amino-3-
isopropylamino-6,7-dihydro-1H,5H-pyrazolo[1,2-a]pyrazol-1-one, 2-
amino-3-(pyrrolidin-1-yl)-6,7-dihydro-1H,5H-pyrazolo[1,2-a]pyrazol-
1-one, 4,5-diamino-1,2-dimethyl-1,2-dihydropyrazol-3-one, 4,5-
diamino-1,2-diethyl-1,2-dihydropyrazol-3-one, 4,5-diamino-1,2-di(2-
hydroxyethyl)-1,2-dihydropyrazol-3-one, 2-amino-3-(2-
hydroxyethyl)amino-6,7-dihydro-1H,5H-pyrazolo[1,2-a]pyrazol-1-one,
2-amino-3-dimethylamino-6,7-dihydro-1H,5H-pyrazolo[1,2-a]pyrazol-
1-one, 2,3-diamino-5,6,7,8-tetrahydro-1H,6H-pyridazino[1,2-
a]pyrazol-1-one, 4-amino-1,2-diethyl-5-(pyrrolidin-1-yl)-1,2-
dihydropyrazol-3-one, 4-amino-5-(3-dimethylaminopyrrolidin-1-yl)-
1,2-diethyl-1,2-dihydropyrazol-3-one, 2,3-diamino-6-hydroxy-6,7-
dihydro-1H,5H-pyrazolo[1,2-a]pyrazol-1-one.
Use will preferably be made of 2,3-diamino-6,7-dihydro-1H,5H-pyrazolo[1,2-a]pyrazol-1-one and/or a salt thereof.

Heterocyclic bases that will preferentially be used include 4,5-diamino-1-(β-hydroxyethyl)pyrazole and/or 2,3-diamino-6,7-dihydro-1H,5H-pyrazolo[1,2-a]pyrazol-1-one and/or a salt thereof.
Preferably, the oxidation bases are chosen from para-
phenylenediamine, 1-methyl-2,5-diaminobenzene, para-aminophenol, 1-
hydroxyethyl-4,5-diaminopyrazole sulfate and 2,3-
diaminodihydroxypyrazolone dimethosulfonate, the addition salts thereof and mixtures thereof.
When it is present in the cosmetic composition according to the present invention, said oxidation base advantageously is present in an amount ranging from 0.001% to 10% by weight, preferably from 0.005% to 10% by weight, relative to the total weight of the cosmetic composition.
The coupler(s) are advantageously chosen from those conventionally used for the dyeing of keratin fibres.
Among these couplers, mention may be made especially of meta-phenylenediamines, meta-aminophenols, meta-diphenols, naphthalene-based couplers and heterocyclic couplers, and also the addition salts thereof.
Examples that may be mentioned include 2-methyl-5-
aminophenol, 5-N-(β-hydroxyethyl)amino-2-methylphenol, 3-
aminophenol, 1,3-dihydroxybenzene, 1,3-dihydroxy-2-methylbenzene,
4-chloro-1,3-dihydroxybenzene, 2,4-diamino-1-(β-
hydroxyethyloxy)benzene, 2-amino-4-(β-hydroxyethylamino)-1-
methoxybenzene, 1,3-diaminobenzene, 1,3-bis(2,4-
diaminophenoxy)propane, 3-ureidoaniline, 3-ureido-1-
dimethylaminobenzene, sesamol, 1 -β-hydroxyethylamino-3,4-
methylenedioxybenzene, α-naphthol, 2-methyl-1-naphthol, 6-
hydroxyindole, 4-hydroxyindole, 4-hydroxy-N-methylindole, 2-amino-
3-hydroxypyridine, 6-hydroxybenzomorpholine, 3,5-diamino-2,6-
dimethoxypyridine, 1-N-(β-hydroxyethyl)amino-3,4-
methylenedioxybenzene, 2,6-bis(β-hydroxyethylamino)toluene, 6-
hydroxyindoline, 2,6-dihydroxy-4-methylpyridine, 1-H-3-

methylpyrazol-5-one, 1-phenyl-3-methylpyrazol-5-one, 2,6-
dimethylpyrazolo[1,5-b]-1,2,4-triazole, 2,6-dimethyl[3,2-c]-1,2,4-
triazole and 6-methylpyrazolo[1,5-a]benzimidazole, the addition salts thereof with an acid, and mixtures thereof.
In general, the addition salts of the oxidation bases and couplers that may be used in the context of the invention are especially chosen from the addition salts with an acid, such as hydrochlorides, hydrobromides, sulfates, citrates, succinates, tartrates, lactates, tosylates, benzenesulfonates, phosphates and acetates.
Preferably, the coupler(s) are chosen from resorcinol, 2-
methylresorcinol, 5-N-(β-hydroxyethyl)amino-2-methylphenol, 2-
methyl-5-aminophenol, 1-β-hydroxyethyloxy-2,4-diaminobenzene
dihydrochloride and 3-aminophenol, the addition salts thereof, and
mixtures thereof.
When it is present in the cosmetic composition according to the present invention, said coupler advantageously is present in an amount ranging from 0.001% to 10% by weight, preferably from 0.005% to 10% by weight, relative to the total weight of the cosmetic composition.
When it is present in the cosmetic composition according to the present invention, said oxidizing dye advantageously is present in an amount ranging from 0.001% to 20% by weight, preferably from 0.01% to 5% by weight, relative to the total weight of the cosmetic composition.
The cosmetic composition may optionally also comprise one or more alkaline agents.
The alkaline agents may be chosen from carbonates,
alkanolamines such as monoethanolamine, diethanolamine,
triethanolamine and derivatives thereof, oxyethylenated and/or oxypropylenated ethylenediamines, mineral or organic hydroxides, alkali metal silicates such as sodium metasilicates, amino acids, preferably basic amino acids such as arginine, lysine, ornithine, citrulline and histidine, and the compounds of formula (I) below:


in which:
- W is a divalent (C1-C8)alkylene group, preferably a propylene group, optionally substituted especially with a hydroxyl group or a C 1-C4 alkyl radical;
- Ra, Rb, Rc and Rd, which may be identical or different, represent a hydrogen atom or a C1-C4 alkyl or C1-C4 hydroxyalkyl radical.
The mineral or organic hydroxides, particularly the mineral or organic hydroxides are preferably chosen from i) hydroxides of an alkali metal, ii) hydroxides of an alkaline-earth metal, for instance sodium hydroxide or potassium hydroxide, iii) hydroxides of a transition metal, such as hydroxides of metals from groups III, IV, V and VI, iv) hydroxides of lanthanides or actinides, quaternary ammonium hydroxides and guanidinium hydroxide.
The hydroxide may be formed in situ, for instance guanidine hydroxide, formed by reacting calcium hydroxide with guanidine carbonate.
Preferably, the alkaline agents are chosen from alkanolamines, in particular monoethanolamine, diethanolamine and triethanolamine, and ammonium hydroxide, and their mixtures.
Said cosmetic composition may optionally also comprise one or more organic solvents.
Organic solvents that may be mentioned include linear or branched and preferably saturated monoalcohols or diols, comprising 2 to 6 carbon atoms, such as ethyl alcohol, isopropyl alcohol, hexylene glycol (2-methyl-2,4-pentanediol), neopentyl glycol and 3-methyl-1,5-pentanediol, butylene glycol, dipropylene glycol and propylene glycol; aromatic alcohols such as benzyl alcohol or phenylethyl alcohol; polyols containing more than two hydroxyl functions, such as glycerol; polyol ethers, for instance ethylene glycol or propylene glycol monomethyl,

monoethyl or monobutyl ethers; and also diethylene glycol alkyl ethers, especially C1-C4 alkyl ethers, for instance diethylene glycol monoethyl ether or monobutyl ether.
The composition according to the invention may further comprise one or more cationic polymers different from the polymers comprising one or more cationic or quaternized acrylamide and/or methacrylamide unit(s) described above. These optional additional cationic polymers do not contain any cationic/quaternized acrylamide and/or methacrylamide unit. Preferably, these optional additional cationic polymers are non silicone polymers.
The additional cationic polymers that may be used preferably have a weight-average molar mass (Mw) of between 500 and 5×106 approximately and preferably between 103 and 3×106 approximately.
Among the additional cationic polymers, mention may be made more particularly of:
(1) Cationic polysaccharides, especially cationic celluloses and galactomannan gums. Among the cationic polysaccharides, mention may be made more particularly of cellulose ether derivatives comprising quaternary ammonium groups, cationic cellulose copolymers or cellulose derivatives grafted with a water-soluble quaternary ammonium monomer and cationic galactomannan gums.
The cellulose ether derivatives comprising quaternary
ammonium groups are especially described in French patent 1 492 597,
and mention may be made of the polymers sold under the name UCARE
POLYMER “JR” (JR 400 LT, JR 125 and JR 30M) or “LR” (LR 400 or
LR 30M) by the company Amerchol. These polymers are also defined in
the CTFA dictionary as quaternary ammoniums of
hydroxyethylcellulose that have reacted with an epoxide substituted with a trimethylammonium group.
Cationic cellulose copolymers or cellulose derivatives grafted with a water-soluble quaternary ammonium monomer are described especially in US patent 4 131 576, and mention may be made of hydroxyalkylcelluloses, for instance hydroxymethyl-, hydroxyethyl- or

hydroxypropylcelluloses grafted, in particular, with a [(meth)acrylic units] dimethyldiallylammonium salt. The commercial products corresponding to this definition are more particularly the products sold under the names CELQUAT L 200 and CELQUAT H 100 by the company National Starch.
The cationic galactomannan gums are described more particularly in US patents 3 589 578 and 4 031 307, and mention may be made of guar gums comprising cationic trialkylammonium groups. Use is made, for example, of guar gums modified with a 2,3-epoxypropyltrimethylammonium salt (for example, chloride). Such products are especially sold under the names JAGUAR C13 S, JAGUAR C 15, JAGUAR C 17 or JAGUAR C162 by the company Rhodia.
(2) Polymers formed from piperazinyl units and divalent
alkylene or hydroxyalkylene radicals containing straight or branched
chains, optionally interrupted with oxygen, sulfur or nitrogen atoms or
with aromatic or heterocyclic rings, and also the oxidation and/or
quaternization products of these polymers.
(3) Water-soluble polyamino amides prepared in particular by
polycondensation of an acidic compound with a polyamine; these
polyamino amides can be crosslinked with an epihalohydrin, a
diepoxide, a dianhydride, an unsaturated dianhydride, a bis-unsaturated
derivative, a bis-halohydrin, a bis-azetidinium, a bis-haloacyldiamine,
a bis-alkyl halide or alternatively with an oligomer resulting from the
reaction of a difunctional compound which is reactive with a bis-
halohydrin, a bis-azetidinium, a bis-haloacyldiamine, a bis-alkyl halide,
an epihalohydrin, a diepoxide or a bis-unsaturated derivative; the
crosslinking agent being used in proportions ranging from 0.025 to 0.35
mol per amine group of the polyamino amide; these polyamino amides
can be alkylated or, if they comprise one or more tertiary amine
functions, they can be quaternized.
(4) Polyamino amide derivatives resulting from the condensation
of polyalkylene polyamines with polycarboxylic acids followed by
alkylation with bifunctional agents. Mention may be made, for example,
of adipic acid/dialkylaminohydroxyalkyldialkylenetriamine polymers in

which the alkyl radical comprises from 1 to 4 carbon atoms and
preferably denotes methyl, ethyl or propyl. Among these derivatives,
mention may be made more particularly of the adipic
acid/dimethylaminohydroxypropyl/diethylenetriamine polymers sold under the name CARTARETINE F, F4 or F8 by the company Sandoz.
(5) Polymers obtained by reacting a polyalkylene polyamine
comprising two primary amine groups and at least one secondary amine
group with a dicarboxylic acid chosen from diglycolic acid and saturated
aliphatic dicarboxylic acids containing from 3 to 8 carbon atoms; the
mole ratio between the polyalkylene polyamine and the dicarboxylic
acid preferably being between 0.8:1 and 1.4:1; the resulting polyamino
amide being reacted with epichlorohydrin in a mole ratio of
epichlorohydrin relative to the secondary amine group of the polyamino
amide preferably of between 0.5:1 and 1.8:1. Polymers of this type are
sold in particular under the name HERCOSETT 57 by the company
Hercules Inc. or alternatively under the name PD 170 or DELSETTE 101
by the company Hercules in the case of the adipic
acid/epoxypropyl/diethylenetriamine copolymer.
(6) Cyclopolymers of alkyldiallylamine or of
dialkyldiallylammonium, such as the homopolymers or copolymers
containing, as main constituent of the chain, units corresponding to
formula (XXX) or (XXXI):



in which:
- k and t are equal to 0 or 1, the sum k + t being equal to 1;
- R12 denotes a hydrogen atom or a methyl radical;
- R10 and R11, independently of each other, denote a C 1-C6 alkyl group, a hydroxyl(C1-C5)alkyl group, a C1-C4 amidoalkyl group; or alternatively R10 and R11 may denote, together with the nitrogen atom to which they are attached, an heterocyclic group such as piperidinyl or morpholinyl; R10 and R11, independently of each other, preferably denote a C1-C4 alkyl group; and
- Y- is an anion such as bromide, chloride, acetate, borate, citrate,
tartrate, bisulfate, bisulfite, sulfate or phosphate.
Mention may be made more particularly of homo or copolymers
of dimethyldiallylammonium halides, preferably homo or copolymers of
dimethyldiallylammonium chloride, still better homopolymer of
dimethyldiallylammonium chloride, such as homopolymer of
dimethyldiallylammonium chloride with corresponding INCI name Polyquaternium-6 sold for example under the name MERQUAT 100 by the company Nalco.
(7) Quaternary diammonium polymers comprising repeating units of formula:

in which:

- R13, R14, R15 and R16, which may be identical or different,
represent aliphatic, alicyclic or arylaliphatic radicals comprising from
1 to 20 carbon atoms, or C1-C12 hydroxyalkylaliphatic radicals,
or else R13, R14, R15 and R16, together or separately, constitute, with the nitrogen atoms to which they are attached, heterocycles optionally comprising a second non-nitrogen heteroatom,
or else R13, R14, R15 and R16 represent a linear or branched C 1-C6 alkyl radical substituted with a nitrile, ester, acyl, amide or -CO-O-R17-D or -CO-NH-R17-D group in which R17 is an alkylene and D is a quaternary ammonium group;
- A1 and B1 represent divalent polymethylene groups comprising from 2 to 20 carbon atoms, linear or branched, saturated or unsaturated, and which may contain, linked to or intercalated in the main chain, one or more aromatic rings or one or more oxygen or sulfur atoms or sulfoxide, sulfone, disulfide, amino, alkylamino, hydroxyl, quaternary ammonium, ureido, amide or ester groups, and
- X- denotes an anion derived from a mineral or organic acid;
it being understood that A1, R 13 and R15 can form, with the two nitrogen atoms to which they are attached, a piperazine ring;
in addition, if A1 denotes a linear or branched, saturated or unsaturated alkylene or hydroxyalkylene radical, B1 may also denote a group (CH2)n-CO-D-OC-(CH2)p- wherein n and p, which may be identical or different, denote an integer from 2 to 20, and wherein D denotes:
a) a glycol residue of formula -O-Z-O-, in which Z denotes a
linear or branched hydrocarbon-based radical, or a group corresponding
to one of the following formulae: -(CH2-CH2-O)x-CH2-CH2- and -[CH2-
CH(CH3)-O]y-CH2-CH(CH3)-, where x and y denote an integer from 1
to 4, representing a defined and unique degree of polymerization or any
number from 1 to 4 representing an average degree of polymerization;
b) a bis-secondary diamine residue such as a piperazine
derivative;
c) a bis-primary diamine residue of formula: -NH-Y-NH-,
where Y denotes a linear or branched hydrocarbon-based radical, or else

the divalent radical
-CH2-CH2-S-S-CH2-CH2-;
d) a ureylene group of formula: -NH-CO-NH-;
Preferably, X- is an anion such as chloride or bromide. These polymers have a number-average molar mass (Mn) generally of between 1000 and 100 000.
Mention may be made more particularly of polymers that are composed of repeating units corresponding to the formula:

in which R1, R2, R3 and R4, which may be identical or different, denote an alkyl or hydroxyalkyl radical containing from 1 to 4 carbon atoms, n and p are integers ranging from 2 to 20, and X- is an anion derived from an organic or mineral acid.
A particularly preferred compound of formula (XXXIII) is that for which R1, R2, R3 and R4 represent a methyl radical and n = 3, p = 6 and X = Cl, known as Hexadimethrine chloride according to the INCI (CTFA) nomenclature.
(8) Polyquaternary ammonium polymers comprising units of formula (XXXIV):

in which:
- R18, R19, R20 and R21, which may be identical or different, represent a
hydrogen atom or a methyl, ethyl, propyl, p-hydroxyethyl, p-
hydroxypropyl or
-CH2CH2(OCH2CH2)pOH group, in which p is equal to 0 or to an integer

between 1 and 6, with the proviso that R 18, R19, R20 and R21 do not simultaneously represent a hydrogen atom,
- r and s, which may be identical or different, are integers between 1 and 6,
- q is equal to 0 or to an integer between 1 and 34,
- X- denotes an anion such as a halide,
- A denotes a dihalide radical or preferably represents -CH2-CH2-O-CH2-CH2-.
Examples that may be mentioned include the products Mirapol® A15, Mirapol® AD1, Mirapol® AZ1 and Mirapol® 175 sold by the company Miranol.
(9) Quaternary polymers of vinylpyrrolidone and of
vinylimidazole, for instance the products sold under the names
Luviquat® FC 905, FC 550 and FC 370 by the company BASF.
(10) Polyamines such as Polyquart® H sold by Cognis, referred to under the name Polyethylene glycol (15) tallow polyamine in the CTFA dictionary.
(11) Polymers comprising in their structure:
(a) one or more units corresponding to formula (A) below:

(b) optionally, one or more units corresponding to formula (B) below:

In other words, these polymers may be chosen especially from homopolymers or copolymers comprising one or more units derived from vinylamine and optionally one or more units derived from vinylformamide.
Preferably, these cationic polymers are chosen from polymers comprising, in their structure, from 5 mol% to 100 mol% of units

corresponding to formula (A) and from 0 to 95 mol% of units corresponding to formula (B), preferentially from 10 mol% to 100 mol% of units corresponding to formula (A) and from 0 to 90 mol% of units corresponding to formula (B).
These polymers may be obtained, for example, by partial hydrolysis of polyvinylformamide. This hydrolysis may be performed in an acidic or basic medium.
The weight-average molecular mass of the said polymer, measured by light scattering, may range from 1,000 to 3 000 000 g/mol, preferably from 10,000 to 1,000,000 g/mol and more particularly from 100,000 to 500,000 g/mol.
The polymers comprising units of formula (A) and optionally units of formula (B) are sold especially under the name Lupamin by the company BASF, for instance, and in a non-limiting manner, the products sold under the names Lupamin 9095, Lupamin 5095, Lupamin 1095, Lupamin 9030 (or Luviquat 9030) and Lupamin 9010.
Other additional cationic polymers that may be used in the
context of the invention are cationic proteins or cationic protein
hydrolysates, polyalkyleneimines, in particular polyethyleneimines,
polymers comprising vinylpyridine or vinylpyridinium units,
condensates of polyamines and of epichlorohydrin, quaternary polyureylenes and chitin derivatives.
The additional cationic polymers, different from the polymers comprising one or more cationic or quaternized acrylamide and/or methacrylamide unit(s) described above, are preferably chosen from cyclopolymers of alkyldiallylamine or of dialkyldiallylammonium corresponding to the general family (6).
More preferentially, the additional cationic polymers are chosen from homo or copolymers of dimethyldiallylammonium halides, preferably homo or copolymers of dimethyldiallylammonium chloride, still better homopolymer of dimethyldiallylammonium chloride, such as homopolymer of dimethyldiallylammonium chloride with corresponding INCI name Polyquaternium-6.

According to a preferred embodiment of the present invention, the composition can comprise:
- one or more polymer(s) comprising one or more cationic or
quaternized (meth)acrylamide units, preferably chosen from
(meth)acrylamido(C1-C6 alkyl)tri(C1-C4 alkyl) ammonium halide
/(meth)acrylamide copolymers, (meth)acrylamido(C1-C6
alkyl)tri(C1-C4 alkyl) ammonium halide / (meth)acrylamide /
(meth)acrylic acid terpolymers, (meth)acrylamido(C 1-C6
alkyl)tri(C1-C4 alkyl) ammonium halide / (C1-C6 alkyl)
(meth)acrylate / (meth)acrylic acid terpolymers; and mixtures thereof, and
- one or more additional cationic polymers, different from the polymers
comprising one or more cationic or quaternized (meth)acrylamide
units described above, preferably chosen from cyclopolymers of
alkyldiallylamine or of dialkyldiallylammonium corresponding to
the general family (6); more preferentially chosen from homo or
copolymers of dimethyldiallylammonium halides, preferably homo
or copolymers of dimethyldiallylammonium chloride, still better
homopolymer of dimethyldiallylammonium chloride with
corresponding INCI name Polyquaternium-6.
The amount of additional cationic polymer(s), different from the
polymers comprising one or more cationic or quaternized
(meth)acrylamide units, when they are present in the cosmetic composition of the present invention, preferably ranges from 0.01 to 10% by weight, more preferentially from 0.02 to 5% by weight, and better still from 0.04 to 1% by weight, and even more preferably 0.05 to 0.5% by weight, relative to the total weight of the cosmetic composition.
Optional additive(s)
The cosmetic composition of the invention may also contain various additives conventionally used in hair compositions.
As additives that may be used in accordance with the invention, mention may be made of anionic or non-ionic polymers, additional

amphoteric polymers different from the polymers comprising one or more cationic or quaternized (meth)acrylamide units previously described, antidandruff agents, anti-seborrhoea agents, agents for preventing hair loss and/or for promoting hair regrowth, fatty substances, vitamins and provitamins including panthenol, sunscreens, mineral or organic pigments, sequestrants, plasticizers, solubilizers, acidifying agents, mineral or organic thickeners, especially polymeric thickeners, opacifiers or nacreous agents, antioxidants, hydroxy acids, fragrances and preserving agents, and mixtures thereof.
The above additives are generally present in an amount for each of them of between 0.01% and 40% by weight, and preferably between 0.1% and 20% by weight relative to the weight of the cosmetic composition of the invention.
Needless to say, a person skilled in the art will take care to select this or these optional additive(s) such that the advantageous properties intrinsically associated with the cosmetic composition in accordance with the invention are not, or are not substantially, adversely affected by the envisaged addition(s).
The present invention also relates to a cosmetic treatment process, especially for dyeing and/or lightening keratin fibres, and in particular human keratin fibres, wherein a composition as described above, is applied to said keratin fibres, and after an optional leave-on time, optionally removing it by rinsing.
The leave-on time of the composition on the keratin fibres may range from 1 minute to 60 minutes, better still from 5 minutes to 45 minutes and even better still from 10 minutes to 30 minutes.
The composition may be applied to wet or dry keratin fibres.
Preferably, the composition as previously described is obtained from the mixture of at least two compositions:
- a first composition comprising one or more oxidation dye(s) as previously described;
- a second composition comprising one or more chemical oxidizing agent(s) as previously defined,

one or more polymers comprising one or more cationic or quaternized
acrylamide and/or methacrylamide unit(s) as previously defined, being
comprised in the first and/or second composition;
at least one oil-in-water emulsion as previously defined, being
comprised in the first and/or second composition,
said polymers comprising one or more cationic or quaternized
acrylamide and/or methacrylamide unit(s) and said oil-in-water
emulsion being preferably in the second composition.
The present invention may also relate to a process for dyeing keratin fibres, which consists in applying to the said keratin fibres a composition comprising:
a. one or more polymers comprising one or more cationic or
quaternized acrylamide and/or methacrylamide unit(s);
b. an oil-in-water emulsion having D50 particle size of less than
350 nm and comprising:
- a silicone mixture comprising (i) one or more trialkylsilyl terminated dialkylpolysiloxane(s) having a viscosity of from 40,000 to less than 100,000 mPa.s at 25°C and (ii) one or more amino silicone(s) having a viscosity of from 1,000 to 15,000 mPa.s at 25°C and an amine value of from 2 to 10 mg of KOH per gram of amino silicone,
- a mixture of emulsifiers comprising one or more nonionic emulsifiers, wherein the mixture of emulsifiers has a HLB value of from 10 to 16, and
- water;
c. one or more chemical oxidizing agent and one or more
oxidation dyes;
d. optionally one or more cationic polymers different from the
polymers comprising one or more cationic or quaternized acrylamide
and/or methacrylamide unit(s).
The invention may also relate to a process for lightening keratin fibres, which consists in applying to the said keratin fibres a composition comprising:

a. one or more polymers comprising one or more cationic or
quaternized acrylamide and/or methacrylamide unit(s);
b. an oil-in-water emulsion having D50 particle size of less than
350 nm and comprising:
- a silicone mixture comprising (i) one or more trialkylsilyl terminated dialkylpolysiloxane(s) having a viscosity of from 40,000 to less than 100,000 mPa.s at 25°C and (ii) one or more amino silicone(s) having a viscosity of from 1,000 to 15,000 mPa.s at 25°C and an amine value of from 2 to 10 mg of KOH per gram of amino silicone,
- a mixture of emulsifiers comprising one or more nonionic emulsifiers, wherein the mixture of emulsifiers has a HLB value of fr om 10 to 16, and
- water;
c. one or more chemical oxidizing agent;
d. optionally one or more cationic polymers different from the
polymers comprising one or more cationic or quaternized acrylamide
and/or methacrylamide unit(s).
The present invention also relates to the use of the composition according to the invention as described above for the cosmetic treatment of keratin fibres, in particular dyeing and/or lightening keratin fibres, and in particular human keratin fibres.
Finally, the invention relates to a kit comprising at least two compartments:
- a first compartment comprising a first composition comprising
one or more oxidation dye(s) as defined above;
- a second compartment comprising a second composition
comprising one or more chemical oxidizing agent(s) as defined above;
one or more polymers comprising one or more cationic or quaternized
acrylamide and/or methacrylamide unit(s) as defined above, being
comprised in the first and/or second composition;
at least one oil-in-water emulsion as defined above being comprised in the first and/or second composition,

said polymers comprising one or more cationic or quaternized acrylamide and/or methacrylamide unit(s) and said oil-in-water emulsion being preferably in the second composition.
In the present invention, the term “keratin fibres” denotes human keratin fibres, and in particular human hair such as hair.
In the above description, all the preferred embodiments with regard to the components may be used individually or in combination.
The examples that follow serve to illustrate the invention.
Examples
In the examples that follow and unless otherwise indicated, the amounts are given as weight percentages of active material (AM) relative to the total weight of the composition.
Example 1: Preparation of an oil-in-water emulsion
450 g of amino silicone fluid (trimethylsilyl-terminated aminoethyl-aminopropylmethylsiloxane - dimethylsiloxane copolymer with amine value of 7.2 mg of KOH/g sample, and a viscosity of 5,600 mPa.s at 25°C) were introduced in an emulsion tank. Stirring was started and 1,800 g of trimethylsilyl terminated dimethylsiloxane polymer fluid of viscosity 61,500 mPa.s at 25°C were introduced under stirring in the same tank. Both fluids were mixed for 2 hours at room temperature.
In a separate tank, 49 g of steareth-6 and 62 g of PEG-100 stearate were introduced and heated to 60°C. The temperature was maintained till both emulsifiers became liquid. Then 31 g of trideceth-3 and 350 g of trideceth-10 (80% of active material) were added. These nonionic emulsifiers mixture had an HLB value = 11.25.
Then 80 g water and 6.2 g glacial acetic acid were added to the
tank and the mixing started. The mixing was continued till whole mass
became a creamy paste. The whole paste was introduced in the emulsion
tank. Homogenization was carried out for 30 minutes at room
temperature. 79.6 g demineralized water were added and
homogenization was carried out for 60 minutes. 72.7 g demineralized

water were added and homogenization was carried out for 50 minutes. 197.4 g demineralized water were added and homogenization was carried out for 5 minutes. 294.3 g demineralized water were added and homogenization was carried out for 5 minutes. 180 g demineralized water were added and homogenization was carried out for 5 minutes. 180 g demineralized water were added and homogenization was carried out for 5 minutes. 197.4 g demineralized water were added and homogenization was carried out for 5 minutes. 197.4 g demineralized water were added and homogenize for 3 minutes. 228.5 g demineralized water were added and homogenization was carried out for 3 minutes. Lastly 40.5 g 2-phenoxyethanol were added as a biocide and homogenization was carried out for 3 minutes.
A stable oil-in-water emulsion having D50 particle size of 170 nm was obtained.
Example 2
The following composition A was prepared from the ingredients indicated in table 1 below (wt. % of AM).

Table 1
Composition A
p-Phenylenediamine 2
Resorcinol 1.71
m-Aminophenol 0.15
2,4-Diaminophenoxyethanol HCl 0.54
Sodium metabisulfite 0.5
Ascorbic acid 0.25
Ethanolamine 4.7
Sodium laureth sulfate 1.4
Prunus amygdalus dulcis (sweet almond) oil / Prunus dulcis 0.01
Carbomer 1
Glycerin 5
EDTA 0.1
Argania spinosa kernel oil 0.01
Acrylates/Beheneth-25 Methacrylate copolymer 0.33
Fragrance / Parfum 0.5
Water Qs 100
Then, the following comparative compositions 1 and 2 and the composition 3 according to the invention were prepared from the ingredients indicated in table 2 below (wt. % of AM).

Table 2
Composition 1 2 3
(Comparati (Comparati (Invention)
ve) ve)
Cetearyl alcohol (and) 2.85 2.85 2.85
ceteareth-25
Trideceth-2 carboxamide 0.85 0.85 0.85
mea
glycerin 0.5 0.5 0.5
Tetrasodium pyrophosphate 0.02 0.02 0.02
Sodium stannate 0.04 0.04 0.04
Pentasodium pentetate 0.06 0.06 0.06
Hydrogen peroxide 6 6 6
Phosphoric acid Qs pH 2 ± Qs pH 2 ± Qs pH 2 ±
0.2 0.2 0.2
Acrylamidopropyltrimonium - - 0.09
chloride/acrylamide
copolymer (= APTAC/AA)
Poly - 0.12 0.12
Diallyldimethylammonium
chloride (in water 40%)
(Polyquaternium-6)
Dimethicone (and) 3 % of 3% of 3% of
Amodimethicone (and) emulsion, emulsion, emulsion,
Trideceth-10 (and) PEG-100 i.e. 0.3% i.e. i.e.
stearate (and) Steareth-6 AM SiA + 0.3%AM 0.3%AM
(and) Trideceth-3 1.2% AM SiA +1.2% SiA + 1.2%
(of example 1) of Si AM of Si AM of Si
Water Qs 100 100 100
*AM = active material SiA: amodimethicone Si: PDMS

The compositions were applied to the hair.
At the time of use, composition A is mixed with oxidizing compositions 1, 2 and 3, respectively, with a mixing ratio 1:1.
Each mixture is then applied on locks of natural 90% grey hair with 10g of mixture for 1g of hair.
After 15 minutes at ambient temperature (around 27°C), the locks are rinsed, shampooed and dried.
Hair locks show a very good color delivery and very good conditioning.
The silicone deposition of product above, namely composition A with compositions 1, 2 and 3, respectively, has been evaluated on locks of natural hair.
The evaluation has been performed with the WDXRF Optim’s Thermofisher (Wavelenght Dispersion) XRF system. The principle is based on radiation emission characteristic of the chemical element, produced by the impact of high energy photons dispensed by an X-ray tube.
The operational parameters are the following:
- Gas Flow Helium – Argon/Methane (90/10)
- X-ray tube (Rh), Crystal PET and detector FPC
- Tension 25 kv – 2 mA
- 3 measurements/lock = 60 s/measurement
- 10 g of product is applied per lock from the root to the end
- Minimum sample size 250 mg (2 mm pieces)
The results appear in the table 3 below: Table 3
Mixture Average silicone deposition (ppm)
A + 1 (comparative) Not detectable
A + 2 (comparative) Not detectable
A + 3 (invention) 451

The mixture according to the invention allows a significant deposition on hair compared to the comparative mixtures.

I/We Claim:
1. Cosmetic composition comprising:
a. one or more polymers comprising one or more cationic or
quaternized acrylamide and/or methacrylamide unit(s);
b. an oil-in-water emulsion having D50 particle size of less than
350 nm and comprising:
- a silicone mixture comprising (i) one or more trialkylsilyl terminated dialkylpolysiloxane(s) having a viscosity of from 40,000 to less than 100,000 mPa.s at 25°C and (ii) one or more amino silicone(s) having a viscosity of from 1,000 to 15,000 mPa.s at 25°C and an amine value of from 2 to 10 mg of KOH per gram of amino silicone,
- a mixture of emulsifiers comprising one or more nonionic emulsifiers, wherein the mixture of emulsifiers has a HLB value of from 10 to 16, and
- water;
c. one or more chemical oxidizing agent and/or one or more
oxidation dyes;
d. optionally one or more cationic polymers different from the
polymers comprising one or more cationic or quaternized acrylamide
and/or methacrylamide unit(s).
2. Cosmetic composition according to claim 1, wherein the
polymer(s) comprising one or more cationic or quaternized acrylamide
and/or methacrylamide unit(s) is(are) chosen from homopolymers or
copolymers comprising at least one of the units of the following
formulae:


In which:
- R1, which may be identical or different, denote a hydrogen atom or a CH3 radical;
- R, which may be identical or different, denote a linear or branched C1-C12 alkyl radical, preferably a linear C1-C6 alkyl radical, optionally substituted by one or more hydroxyl radicals;
- R5, R6 and R7, which may be identical or different, denote a linear or branched C 1-C18 alkyl radical or a benzyl radical, preferably a linear or branched C 1-C6 alkyl radical;
- R8 and R9, which may be identical or different, denote a hydrogen atom or a linear or branched C1-C6 alkyl radical, preferably methyl or ethyl; and
- Y- denotes an anion derived from a mineral or organic acid or a halide, preferably bromide, chloride, acetate, borate, citrate, tartrate, bisulfate, bisulfite, methosulfate, sulfate or phosphate anion.

3. Cosmetic composition composition according to claim 1 or 2, wherein the polymer(s) comprising one or more cationic or quaternized acrylamide and/or methacrylamide unit(s) further contain one or more units derived from comonomers that are selected from the families of acrylamides, methacrylamides, diacetone acrylamides, acrylic or methacrylic acids or esters thereof, vinyllactams such as vinylpyrrolidone or vinylcaprolactam, and vinyl esters, preferably selected from the families of acrylamide and methacrylamides, and more preferentially acrylamide or methacrylamide.
4. Cosmetic composition according to any one of the preceding claims, wherein the polymer(s) comprising one or more cationic or quaternized acrylamide and/or methacrylamide unit(s) is(are) chosen from amphoteric polymers, and preferably from amphoteric polymers comprising a repetition of:
(i) one or more units derived from a monomer of (meth)acrylamide type,
(ii) one or more units derived from a monomer of
(meth)acrylamidoalkyltrialkylammonium type, and
(iii) one or more units derived from an acidic monomer of (meth)acrylic acid type.

5. Cosmetic composition according to any one of the preceding
claims, wherein the polymer(s) comprising one or more cationic or
quaternized acrylamide and/or methacrylamide unit(s) is(are) chosen
from:
- (meth)acrylamido(C1-C6 alkyl)tri(C1-C4 alkyl) ammonium halide/
(meth)acrylamide copolymers, preferably
(meth)acrylamidopropyltrimonium chloride/ (meth)acrylamide
copolymers, and more preferably acrylamidopropyltrimonium chloride/ acrylamide copolymers,
- (meth)acrylamido(C1-C6 alkyl)tri(C1-C4 alkyl) ammonium halide
/(meth)acrylamide/(meth)acrylic acid terpolymers, preferably
(meth)acrylamidopropyltrimonium chloride / (meth)acrylamide /
(meth)acrylic acid terpolymers, more preferably acrylamide/
methacrylamidopropyltrimethylammonium chloride/ acrylic acid
terpolymers,
- (meth)acrylamido(C1-C6 alkyl)tri(C1-C4 alkyl) ammonium halide/ (C1-
C6 alkyl) (meth)acrylate / (meth)acrylic acid terpolymers, preferably
(meth)acrylamidopropyltrimonium chloride / (C1-C6 alkyl)
(meth)acrylate / (meth)acrylic acid terpolymers; more preferably acrylic
acid/ methylacrylamidopropyltrimethylammonium chloride/ methyl
acrylates terpolymers,
- and mixtures thereof.
6. Cosmetic composition according to any one of the preceding claims, wherein the amount of polymers comprising one or more cationic or quaternized acrylamide and/or methacrylamide unit(s) ranges from 0.01 to 5% by weight, preferably from 0.015% to 4% by weight, and more preferably from 0.02 to 2% by weight, better still from 0.03 to 1% by weight, and even more preferentially from 0.04 to 0.5% by weight, relative to the total weight of the cosmetic composition.
7. Cosmetic composition according to any one of the preceding claims, wherein the trialkylsilyl terminated dialkylpolysiloxanes are of
formula (IX): R’3SiO(R’2SiO)pSiR’3 (IX),

wherein:
- R’, identical or different, is a monovalent hydrocarbon radical having from 1 to 18 carbon atoms, preferably from 1 to 6 carbon atoms , and
- p is an integer of from 500 to 2,000, preferably of from 1,000 to 2,000; and preferably are trimethylsilyl terminated PDMS (polydimethylsiloxanes or dimethicones).

8. Cosmetic composition according to any one of the preceding claims, wherein the trialkylsilyl terminated dialkylpolysiloxanes have a viscosity of from 40,000 to 70,000 mPa.s at 25°C, preferably of from 51,000 to 70,000 mPa.s at 25°C.
9. Cosmetic composition according to any one of the preceding claims, wherein the amino silicones are of formula (X): XR2Si(OSiAR)n(OSiR2)mOSiR2X (X),
wherein:
- R, identical or different, is a monovalent hydrocarbon radical having
from 1 to 18 carbon atoms, preferably from 1 to 6 carbon atoms,
- X, identical or different, is R or a hydroxyl (OH) or a C 1-C6-alkoxy
group; preferably X is R,
- A is an amino radical of the formula -R1-[NR2-R3-]xNR22, or the
protonated amino forms of said amino radical, wherein R1 is a C1-C6-
alkylene radical, preferably a radical of the formula -CH2CH2CH2- or -
CH2CH(CH3)CH2-, R2, identical or different, is a hydrogen atom or a
C1-C4-alkyl radical, preferably a hydrogen atom, R3 is a C1-C6-alkylene
radical, preferably a radical of the formula -CH2CH2-, and x is 0 or 1;
and
- m+n is an integer from 50 to about 1000, preferably from 50 to 600;
preferably A is an amino radical of the formula -R1-[NR2-R3-]xNR22, or the protonated amino forms of said amino radical, wherein R1 is -CH2CH2CH2- or -CH2CH(CH3)CH2-, R2 are hydrogen atoms, R3 is -CH2CH2-, and x is 1.
10. Cosmetic composition according to any one of the preceding
claims, wherein the silicone mixture preferably comprises (i) one or
more trialkylsilyl terminated dialkylpolysiloxanes having a viscosity of

from 40,000 to less than 100,000 mPa.s at 25°C in a quantity of from 70 to 90% by weight, preferably from 75 to 85% by weight, relative to the total weight of the silicone mixture, and (ii) one or more amino silicones having a viscosity of from 1,000 to 15,000 mPa.s at 25°C and an amine value of from 2 to 10 mg of KOH per gram of amino silicone, in a quantity of from 10 to 30% by weight, preferably from 15 to 25% by weight, relative to the total weight of the silicone mixture.
11. Cosmetic composition according to any one of the preceding
claims, wherein the mixture of emulsifiers comprises one or more
emulsifiers chosen from:
(i) polyoxyalkylene alkyl ethers, especially (poly)ethoxylated fatty alcohols of formula: R 3-(OCH2CH2)cOH with:
- R3 representing a linear or branched C8-C40 alkyl or alkenyl group,
preferably C8-C30 alkyl or alkenyl group, optionally substituted with one
or more hydroxyl groups, and
- c being an integer between 1 and 200 inclusive, preferentially between
2 and 150;
and more particularly fatty alcohols comprising from 8 to 22 carbon atoms, oxyethylenated with 1 to 30 mol of ethylene oxide (1 to 30 OE); (ii) polyoxyalkylene (C8-C32)alkylphenyl ethers;
(iii) polyoxyalkylene sorbitan (C8-C32) fatty acid esters, especially polyethoxylated fatty acid esters of sorbitan preferably containing from 2 to 40 ethylene oxide units, most preferably from 2 to 20 ethylene oxide units; preferably polyoxyethylenated sorbitan (C 10-C24) fatty acid esters preferably containing from 2 to 40 ethylene oxide units, most preferably from 2 to 20 ethylene oxide units; and
(iv) polyoxyethylenated (C8-C32) fatty acid esters containing for example from 2 to 150 mol of ethylene oxide; preferably polyoxyethylenated (C10-C24) fatty acid esters containing for example from 2 to 150 mol of ethylene oxide.
12. Cosmetic composition according to any one of the preceding
claims, wherein the oil-in-water emulsion comprises:

- the mixture of emulsifiers in a total amount of from 5 to 15% by weight, preferably of from 8 to 15% by weight, most preferably of from 10 to 12% by weight, relative to the total weight of the emulsion; and/or
- nonionic emulsifiers in a total amount of from 5 to 15% by weight, preferably of from 8 to 15% by weight, most preferably of from 10 to 12% by weight, relative to the total weight of the emulsion; and/or
- cationic emulsifiers in a total amount of from 0,5 to 1,5% by weight, relative to the total weight of the emulsion; and/or
- the silicone mixture in a total amount of from 40 to 60% by weight, preferably of from 45 to 55% by weight, relative to the total weight of the emulsion; and/or
- the trialkylsilyl terminated dialkylpolysiloxane(s) in a total amount of from 35 to 45% by weight, preferably of from 38-42% by weight, relative to the total weight of the emulsion; and/or
- the amino silicone(s) in a total amount of from 5 to 15% by weight, preferably of from 8-12% by weight, relative to the total weight of the emulsion; and/or
- water in an amount of from 25 to 50% by weight, preferably of from 30 to 45% by weight, most preferably of from 35 to 42% by weight, relative to the total weight of the emulsion.

13. Cosmetic composition according to any one of the preceding claims, wherein the oil-in-water emulsion has D50 particle size of from 100 to 300 nm, preferably from 150 to 250 nm, more preferably from 150 to 225 nm, and most preferably from 160 to 200 nm, expressed in volume.
14. Cosmetic composition according to any one of the preceding claims, wherein the oil-in-water emulsion is present in an amount ranging from 0.1% to 20% by weight, preferably from 0.3% to 10% by weight and better still from 0.4 % to 10% by weight, better from 0.5 to 8% by weight relative to the total weight of the composition.
15. Cosmetic composition according to any one of the preceding claims, wherein the chemical oxidizing agent(s) is(are) chosen from hydrogen peroxide, urea peroxide, alkali metal bromates, persalts such as perborates and persulphates, in particular sodium persulphate,

potassium persulphate and ammonium persulphate, peracids and oxidase enzymes, such as peroxidases, 2-electron oxidoreductases such as uricases and 4-electron oxygenases such as laccases, and mixtures thereof, preferably hydrogen peroxide, persalts, and mixtures thereof, and better still is hydrogen peroxide.
16. Cosmetic composition according to any one of the preceding claims, wherein the oxidation dye(s) is(are) chosen from oxidation bases and optionally couplers and preferably comprise(s) at least one oxidation base and at least one coupler.
17. Cosmetic composition according to any one of the preceding claims, wherein the cationic polymer(s) different from the polymers comprising one or more cationic or quaternized acrylamide and/or methacrylamide unit(s) are chosen from homo or copolymers of dimethyldiallylammonium halides, preferably homo or copolymers of dimethyldiallylammonium chloride, still better homopolymer of dimethyldiallylammonium chloride.
18. Cosmetic treatment process, especially for dyeing and/or
lightening keratin fibres, and in particular human keratin fibres, wherein
a composition according to any one of the preceding claims is applied
to said keratin fibres.
19. Process for dyeing keratin fibres, consisting in applying to
the said keratin fibres a composition comprising:
a. one or more or more polymers comprising one or more cationic
or quaternized acrylamide and/or methacrylamide unit(s);
b. an oil-in-water emulsion having D50 particle size of less than
350 nm and comprising:
- a silicone mixture comprising (i) one or more trialkylsilyl terminated dialkylpolysiloxane(s) having a viscosity of from 40,000 to less than 100,000 mPa.s at 25°C and (ii) one or more amino silicone(s) having a viscosity of from 1,000 to 15,000 mPa.s at 25°C and an amine value of from 2 to 10 mg of KOH per gram of amino silicone,
- a mixture of emulsifiers comprising one or more nonionic emulsifiers, wherein the mixture of emulsifiers has a HLB value of from 10 to 16, and

- water;
c. one or more chemical oxidizing agent(s) and one or more
oxidation dyes;
d. optionally one or more cationic polymers different from the
polymers comprising one or more cationic or quaternized acrylamide
and/or methacrylamide unit(s).
20. Process for lightening keratin fibres, consisting in applying
to the said keratin fibres a composition comprising:
a. one or more or more polymers comprising one or more cationic
or quaternized acrylamide and/or methacrylamide unit(s);
b. an oil-in-water emulsion having D50 particle size of less than
350 nm and comprising:
- a silicone mixture comprising (i) one or more trialkylsilyl terminated dialkylpolysiloxane(s) having a viscosity of from 40,000 to less than 100,000 mPa.s at 25°C and (ii) one or more amino silicone(s) having a viscosity of from 1,000 to 15,000 mPa.s at 25°C and an amine value of from 2 to 10 mg of KOH per gram of amino silicone,
- a mixture of emulsifiers comprising one or more nonionic emulsifiers, wherein the mixture of emulsifiers has a HLB value of fr om 10 to 16, and
- water;
c. one or more chemical oxidizing agent(s);
d. optionally one or more cationic polymers different from the
polymers comprising one or more cationic or quaternized acrylamide
and/or methacrylamide unit(s).
21. Use of the composition as defined in any of claims 1 to 17 for the cosmetic treatment of keratin fibres, in particular dyeing and/or lightening keratin fibres, and in particular human keratin fibres.
22. Kit comprising at least two compartments:

- a first compartment comprising a first composition comprising one or more oxidation dye(s) as defined in any one of claims 1 to 17;
- a second compartment comprising a second composition comprising one or more chemical oxidizing agent(s) as defined in any one of claims 1 to 17;

one or more polymers comprising one or more cationic or quaternized acrylamide and/or methacrylamide unit(s) as defined in any one of claims 1 to 17, being comprised in the first and/or second composition; a oil-in-water emulsion as defined in any one of claims 1 to 17, being comprised in the first and/or second composition,
said polymers comprising one or more cationic or quaternized acrylamide and/or methacrylamide unit(s) and said oil-in-water emulsion being preferably in the second composition.