LAUNDRY TREATMENT COMPOSITION COMPRISING BIS-AZO SHADING DYES
Field of Invention
The present invention concerns laundry shading dye
compositions .
Background of the Invention
WO2005/003274 (Unilever) and WO2005/014769 (Ciba) discloses
specific anionic bis-azo direct dyes in laundry formulations
for improving garment whiteness. Direct Violet 9 , direct
violet 51, direct violet 99 and direct violet 35 are
examples of such dyes.
WO2007/003524 (Ciba) discloses anionic bis-azo direct dyes,
with oxyalkylene groups, and their use in production of
white paper.
Summary of the Invention
The bis-azo oxyalkylene dyes as used in the present
invention provide improved performance from laundry
formulations. The dyes have higher water solubility, high
whitening performance and higher light fastness in domestic
laundry applications than comparable dyes of the prior art.
In another aspect the present invention provides a laundry
treatment composition comprising:
(i) from 2 to 70 wt% of a surfactant; and,
(ii) from 0.00001 to 0.5 wt%, preferably 0.00005 to 0.001
wt%, of a bis-azo oxyalkylene dye, wherein the bis-azo
oxyalkylene dye is selected from structure (I) and structure
(ID :
wherein :
n is selected from: 0 ; 1 ; and, 2;
Ri is H ; and C¾; preferably H
R2 is selected from: COCH 3; COC2H5; H ; and, Ph;
R 3 and R are independently selected from: H ; Me; and, Et;
P is selected from: Cl-C4-alkyl; OCl-C4-alkyl ; and, an
oxyalkylene group having one or more repeating units; and,
G is an oxyalkylene group having 1 or more repeating units.
In a further aspect the present invention provides a method
of treating a laundry textile, the method comprising the
steps of:
(i) treating a textile with an aqueous solution of the
bis-azo oxyalkylene dye, the aqueous solution comprising
from 0.1 ppb to 500 ppm of the bis-azo oxyalkylene dye
(preferably 1 to lOOOppb, most preferably 2 to lOOppb) ; and,
from 0.0 g/L to 3 g/L, preferably 0.3 to 2 g/L, of a
surfactant ;
(ii) optionally rinsing; and,
(iii) drying the textile.
Preferably the method is domestic and performed in a front
loading automatic washing machine, top loading automatic
washing machine, or by hand.
Preferably the laundry treatment composition is granular and
preferably the granular composition contains sodium
carbonate, with predominately anionic surfactants, most
preferably LAS.
DETAILED DESCRIPTION OF THE INVENTION
The bis-azo oxyalkylene dye, as indicated by the dashed
structures, may have naphthyl rings instead of the phenyl
rings. The sulphonate, R 3 and R substituent may be attached
to the phenyl ring or the naphthyl ring.
When R 2 is a Ph group, the Ph group may be substituted by
further organic groups. When the Ph group is substituted the
following are preferred groups: halogen, N¾, N02, C1-C4
alkyl, and OC1-C4 alkyl.
The preferred embodiments of the bis-azo oxyalkylene dye are
discussed below.
Preferably, G is an oxyalkylene group having from 1 to 2 0
repeating units.
Preferably, G is an oxyalkylene group selected from:
[(CH2CR5HO) (CH2CR6HO) yR7] wherein x+y < 5 , wherein y > 1 and
z = 0 to 5 , R5 is selected from: H ; CH3; CH20 (CH2CH20 )ZH and
mixtures thereof; R is selected from: H ; CH20 (CH2CH20 )ZH and
mixtures thereof; and, R 7 is selected from: H ; and, C¾ . Most
preferably x+y £ 2 , wherein y > 1 and z = 0 to 2 .
Preferably, the oxyalkylene group is selected from: ethylene
oxide; propylene oxide; glycidol oxide; butylene oxide; and,
mixtures thereof.
Preferably, P is C¾ .
Preferably, G is: (CH2CH20 )mH wherein m = 1 to . Most
preferably m = 1 .
Preferably, n is selected from: 1 or 2 .
Preferably, the dye is of structure (I) .
When P is an oxyalkylene group it is preferably selected
from: [(CH2CR5HO) x (CH2CR6HO) yR7] wherein x+y < 5 , wherein y >
1 and z = 0 to 5 , R5 is selected from: H ; CH3; CH20 (CH2CH20 )ZH
and mixtures thereof; R is selected from: H ; CH20 (CH2CH20 )ZH
and mixtures thereof; and, R 7 is selected from: H ; and, C¾ .
The oxyalkylene group is terminated (chain capped) is H or
Me, preferably H .
P&G groups are preferably different.
The dyes show lower spotting to textiles.
Preferred examples of such dyes are:
OTHER DYES
In a preferred embodiment of the invention, other shading
colourants may be present. They are preferably selected from
hydrophobic dyes more preferably solvent and disperse dyes
such as solvent violet 13, disperse violet 27, disperse
violet 2 8 and alkoxylated thiophene dyes.
A hydrophobic dye is uncharged pH = 8 .
Even more preferred is the presence of acid azine dyes as
described in WO 2008/017570; the level of the acid azine
dyes should be in the range from 0.0001 to 0.1 wt%. The acid
azine dyes provide benefit predominately to the pure cotton
garments and the cationic phenazine dyes to the polycotton
garments. Preferred acid azine dyes are acid violet 50, acid
blue 59 and acid blue 98. Blue and Violet cationic phenazine
dyes may also be present as discussed in WO2009/141172 and
WO2009/141173 .
Photobleaches such as sulphonated Zn/Al phthalocyanins may
be present.
SURFACTANT
The laundry composition comprises between 2 to 70 wt percent
of a surfactant, most preferably 10 to 30 wt % . In general,
the nonionic and anionic surfactants of the surfactant
system may be chosen from the surfactants described "Surface
Active Agents" Vol. 1 , by Schwartz & Perry, Interscience
1949, Vol. 2 by Schwartz, Perry & Berch, Interscience 1958,
in the current edition of "McCutcheon 's Emulsifiers and
Detergents" published by Manufacturing Confectioners Company
or in "Tenside-Taschenbuch" , H . Stache, 2nd Edn., Carl
Hauser Verlag, 1981. Preferably the surfactants used are
saturated.
Suitable nonionic detergent compounds which may be used
include, in particular, the reaction products of compounds
having a hydrophobic group and a reactive hydrogen atom, for
example, aliphatic alcohols, acids, amides or alkyl phenols
with alkylene oxides, especially ethylene oxide either alone
or with propylene oxide. Specific nonionic detergent
compounds are C to C22 alkyl phenol-ethylene oxide
condensates, generally 5 to 25 EO, i.e. 5 to 25 units of
ethylene oxide per molecule, and the condensation products
of aliphatic C to C i s primary or secondary linear or
branched alcohols with ethylene oxide, generally 5 to 40 EO.
Suitable anionic detergent compounds which may be used are
usually water-soluble alkali metal salts of organic
sulphates and sulphonates having alkyl radicals containing
from about 8 to about 22 carbon atoms, the term alkyl being
used to include the alkyl portion of higher acyl radicals.
Examples of suitable synthetic anionic detergent compounds
are sodium and potassium alkyl sulphates, especially those
obtained by sulphating higher C to C i s alcohols, produced
for example from tallow or coconut oil, sodium and potassium
alkyl C 9 to C 2 0 benzene sulphonates, particularly sodium
linear secondary alkyl C 10 to C15 benzene sulphonates; and
sodium alkyl glyceryl ether sulphates, especially those
ethers of the higher alcohols derived from tallow or coconut
oil and synthetic alcohols derived from petroleum. The
preferred anionic detergent compounds are sodium C to C15
alkyl benzene sulphonates and sodium C12 to Cis alkyl
sulphates. Also applicable are surfactants such as those
described in EP-A-328 177 (Unilever) , which show resistance
to salting-out, the alkyl polyglycoside surfactants
described in EP-A-070 074, and alkyl monoglycosides .
Preferred surfactant systems are mixtures of anionic with
nonionic detergent active materials, in particular the
groups and examples of anionic and nonionic surfactants
pointed out in EP-A-346 995 (Unilever). Especially preferred
is surfactant system that is a mixture of an alkali metal
salt of a Ci6 to Cis primary alcohol sulphate together with a
C12 to Cis primary alcohol 3 to 7 EO ethoxylate.
The nonionic detergent is preferably present in amounts less
than 50wt%, most preferably less than 20wt% of the
surfactant system. Anionic surfactants can be present for
example in amounts in the range from about 50% to 100 wt %
of the surfactant system.
In another aspect which is also preferred the surfactant may
be a cationic such that the formulation is a fabric
conditioner.
CATIONIC COMPOUND
When the present invention is used as a fabric conditioner
it needs to contain a cationic compound.
Most preferred are quaternary ammonium compounds.
It is advantageous if the quaternary ammonium compound is a
quaternary ammonium compound having at least one C12 to C22
alkyl chain.
It is preferred if the quaternary ammonium compound has the
following formula:
R2
R1-N-R3 X
I
R4
in which R is a C12 to C22 alkyl or alkenyl chain; R2, R3 and
R4 are independently selected from C i to C alkyl chains and
X~ is a compatible anion. A preferred compound of this type
is the quaternary ammonium compound cetyl trimethyl
quaternary ammonium bromide.
A second class of materials for use with the present
invention are the quaternary ammonium of the above structure
in which R and R2 are independently selected from C12 to C22
alkyl or alkenyl chain; R3 and R4 are independently selected
from C i to C alkyl chains and X~ is a compatible anion.
A detergent composition according to claim 1 in which the
ratio of (ii) cationic material to (iv) anionic surfactant
is at least 2:1.
Other suitable quaternary ammonium compounds are disclosed
in EP 0 239 910 (Proctor and Gamble) .
It is preferred if the ratio of cationic to nonionic
surfactant is from 1:100 to 50:50, more preferably 1:50 to
20:50.
The cationic compound may be present from 1.5 wt % to 50 wt
% of the total weight of the composition. Preferably the
cationic compound may be present from 2 wt % to 25 wt % , a
more preferred composition range is from 5 wt % to 2 0 wt % .
The softening material is preferably present in an amount of
from 2 to 60% by weight of the total composition, more
preferably from 2 to 40%, most preferably from 3 to 30% by
weight .
The composition optionally comprises a silicone.
BUILDERS OR COMPLEXING AGENTS
Builder materials may be selected from 1 ) calcium
sequestrant materials, 2 ) precipitating materials,
3 ) calcium ion-exchange materials and 4 ) mixtures thereof.
Examples of calcium sequestrant builder materials include
alkali metal polyphosphates, such as sodium tripolyphosphate
and organic sequestrants , such as ethylene diamine tetraacetic
acid.
Examples of precipitating builder materials include sodium
orthophosphate and sodium carbonate.
Examples of calcium ion-exchange builder materials include
the various types of water-insoluble crystalline or
amorphous aluminosilicates , of which zeolites are the best
known representatives, e.g. zeolite A , zeolite B (also known
as zeolite P ) , zeolite C , zeolite X , zeolite Y and also the
zeolite P-type as described in EP-A-0, 384, 070 .
The composition may also contain 0-65 % of a builder or
complexing agent such as ethylenediaminetetraacetic acid,
diethylenetriamine-pentaacetic acid, alkyl- or
alkenylsuccinic acid, nitrilotriacetic acid or the other
builders mentioned below. Many builders are also bleachstabilising
agents by virtue of their ability to complex
metal ions.
Zeolite and carbonate (carbonate (including bicarbonate and
sesquicarbonate) are preferred builders.
The composition may contain as builder a crystalline
aluminosilicate, preferably an alkali metal aluminosilicate,
more preferably a sodium aluminosilicate. This is typically
present at a level of less than 15%w. Aluminosilicates are
materials having the general formula:
0.8-1.5 M20 . A1203 . 0.8-6 Si02
where M is a monovalent cation, preferably sodium. These
materials contain some bound water and are required to have
a calcium ion exchange capacity of at least 50 mg CaO/g.
The preferred sodium aluminosilicates contain 1.5-3.5 S1O 2
units in the formula above. They can be prepared readily by
reaction between sodium silicate and sodium aluminate, as
amply described in the literature. The ratio of surfactants
to alumuminosilicate (where present) is preferably greater
than 5:2, more preferably greater than 3:1.
Alternatively, or additionally to the aluminosilicate
builders, phosphate builders may be used. In this art the
term phosphate' embraces diphosphate, triphosphate, and
phosphonate species. Other forms of builder include
silicates, such as soluble silicates, metasilicates , layered
silicates (e.g. SKS-6 from Hoechst) .
Preferably the laundry detergent formulation is a nonphosphate
built laundry detergent formulation, i.e.,
contains less than 1 wt% of phosphate. Preferably the
laundry detergent formulation is carbonate built.
FLUORESCENT AGENT
The composition preferably comprises a fluorescent agent
(optical brightener) . Fluorescent agents are well known and
many such fluorescent agents are available commercially.
Usually, these fluorescent agents are supplied and used in
the form of their alkali metal salts, for example, the
sodium salts. The total amount of the fluorescent agent or
agents used in the composition is generally from 0.005 to 2
wt % , more preferably 0.01 to 0.1 wt % . Preferred classes of
fluorescer are: Di-styryl biphenyl compounds, e.g. Tinopal
(Trade Mark) CBS-X, Di-amine stilbene di-sulphonic acid
compounds, e.g. Tinopal DMS pure Xtra and Blankophor (Trade
Mark) HRH, and Pyrazoline compounds, e.g. Blankophor SN.
Preferred fluorescers are: sodium 2 (4-styryl-3-
sulfophenyl )-2H-napthol [1,2-d] triazole, disodium 4,4'-
bis {[(4-anilino-6- (N methyl-N-2 hydroxyethyl ) amino 1,3,5-
triazin-2-yl) ]amino }stilbene-2-2 ' disulfonate, disodium
4,4 '-bis {[(4-anil ino- 6-morpholino-l ,3,5-triazin-2-yl) ]amino }
stilbene-2-2' disulfonate, and disodium 4 ,4 '-bis (2-
sulfostyryl) biphenyl .
It is preferred that the aqueous solution used in the method
has a fluorescer present. When a fluorescer is present in
the aqueous solution used in the method it is preferably in
the range from 0.0001 g/1 to 0.1 g/1, preferably 0.001 to
0.02 g/1.
PERFUME
Preferably the composition comprises a perfume. The perfume
is preferably in the range from 0.001 to 3 wt % , most
preferably 0.1 to 1 wt % . Many suitable examples of perfumes
are provided in the CTFA (Cosmetic, Toiletry and Fragrance
Association) 1992 International Buyers Guide, published by
CFTA Publications and OPD 1993 Chemicals Buyers Directory
80th Annual Edition, published by Schnell Publishing Co.
It is commonplace for a plurality of perfume components to
be present in a formulation. In the compositions of the
present invention it is envisaged that there will be four or
more, preferably five or more, more preferably six or more
or even seven or more different perfume components.
In perfume mixtures preferably 15 to 25 wt% are top notes.
Top notes are defined by Poucher (Journal of the Society of
Cosmetic Chemists 6(2): 80 [1955]). Preferred top-notes are
selected from citrus oils, linalool, linalyl acetate,
lavender, dihydromyrcenol , rose oxide and cis-3-hexanol .
Perfume and top note may be used to cue the whiteness
benefit of the invention.
It is preferred that the laundry treatment composition does
not contain a peroxygen bleach, e.g., sodium percarbonate,
sodium perborate, and peracid.
POLYMERS
The composition may comprise one or more further polymers.
Examples are carboxymethylcellulose, poly (ethylene glycol) ,
poly (vinyl alcohol), polycarboxylates such as polyacrylates ,
maleic/acrylic acid copolymers and lauryl
methacrylate/acrylic acid copolymers.
Polymers present to prevent dye deposition, for example
poly (vinylpyrrolidone) , poly (vinylpyridine-N-oxide) , and
poly (vinylimidazole) , are preferably absent from the
formulation.
ENZYMES
One or more enzymes are preferred present in a composition
of the invention and when practicing a method of the
invention .
Preferably the level of each enzyme is from 0.0001 wt% to
0.1 wt% protein.
Especially contemplated enzymes include proteases, alphaamylases,
cellulases, lipases, peroxidases/oxidases, pectate
lyases, and mannanases, or mixtures thereof.
Suitable lipases include those of bacterial or fungal
origin. Chemically modified or protein engineered mutants
are included. Examples of useful lipases include lipases
from Humicola (synonym Thermomyces) , e.g. from H . lanuginosa
(T. lanuginosus) as described in EP 258 068 and EP 305 216
or from H . insolens as described in WO 96/13580, a
Pseudomonas lipase, e.g. from P . alcaligenes or P .
pseudoalcaligenes (EP 218 272), P . cepacia (EP 331 376), P .
stutzeri (GB 1,372,034), P . fluorescens, Pseudomonas sp .
strain SD 705 (WO 95/06720 and WO 96/27002), P .
wisconsinensis (WO 96/12012), a Bacillus lipase, e.g. from
B . subtilis (Dartois et al . (1993), Biochemica et Biophysica
Acta, 1131, 253-360), B . stearothermophilus
(JP 64/744992) or B . pumilus (WO 91/16422) .
Other examples are lipase variants such as those described
in WO 92/05249, WO 94/01541, EP 407 225, EP 260 105, WO
95/35381, WO 96/00292, WO 95/30744, WO 94/25578,
WO 95/14783, WO 95/22615, WO 97/04079 and WO 97/07202, WO
00/60063.
Preferred commercially available lipase enzymes include
Lipolase™ and Lipolase Ultra™, Lipex™ (Novozymes A/S) .
The method of the invention may be carried out in the
presence of phospholipase classified as EC 3.1.1.4 and/or
EC 3.1.1.32. As used herein, the term phospholipase is an
enzyme which has activity towards phospholipids.
Phospholipids, such as lecithin or phosphatidylcholine,
consist of glycerol esterified with two fatty acids in an
outer (sn-1) and the middle (sn-2) positions and esterified
with phosphoric acid in the third position; the phosphoric
acid, in turn, may be esterified to an amino-alcohol .
Phospholipases are enzymes which participate in the
hydrolysis of phospholipids. Several types of phospholipase
activity can be distinguished, including phospholipases i
and A 2 which hydrolyze one fatty acyl group (in the sn-1 and
sn-2 position, respectively) to form lysophospholipid; and
lysophospholipase (or phospholipase B ) which can hydrolyze
the remaining fatty acyl group in lysophospholipid.
Phospholipase C and phospholipase D (phosphodiesterases)
release diacyl glycerol or phosphatidic acid respectively.
The enzyme and the shading dye may show some interaction and
should be chosen such that this interaction is not negative.
Some negative interactions may be avoided by encapsulation
of one or other of enzyme or shading dye and/or other
segregation within the product.
Suitable proteases include those of animal, vegetable or
microbial origin. Microbial origin is preferred. Chemically
modified or protein engineered mutants are included. The
protease may be a serine protease or a metallo protease,
preferably an alkaline microbial protease or a trypsin-like
protease. Preferred commercially available protease enzymes
include Alcalase™, Savinase™, Primase™, Duralase™, Dyrazym™,
Esperase™, Everlase™, Polarzyme™, and Kannase™, (Novozymes
A/S), Maxatase™, Maxacal™, Maxapem™, Properase™, Purafect™,
Purafect OxP™, FN2™, and F 3™ (Genencor International Inc.).
The method of the invention may be carried out in the
presence of cutinase. classified in EC 3.1.1.74. The
cutinase used according to the invention may be of any
origin. Preferably cutinases are of microbial origin, in
particular of bacterial, of fungal or of yeast origin.
Suitable amylases (alpha and/or beta) include those of
bacterial or fungal origin. Chemically modified or protein
engineered mutants are included. Amylases include, for
example, alpha-amylases obtained from Bacillus, e.g. a
special strain of B . lichen! formis , described in more detail
in GB 1,296,839, or the Bacillus sp . strains disclosed in WO
95/026397 or WO 00/060060. Commercially available amylases
are Duramyl™, Termamyl™, Termamyl Ultra™, Natalase™,
Stainzyme™, Fungamyl™ and BAN™ (Novozymes A/S), Rapidase™
and Purastar™ (from Genencor International Inc.).
Suitable cellulases include those of bacterial or fungal
origin. Chemically modified or protein engineered mutants
are included. Suitable cellulases include cellulases from
the genera Bacillus , Pseudomonas , Humicola , Fusarium,
Thielavia, Acremonium, e.g. the fungal cellulases produced
from Humicola insolens , Thielavia terrestris , Myceliophthora
thermophila , and Fusarium oxysporum disclosed in US
4,435,307, US 5,648,263, US 5,691,178, US 5,776,757, WO
89/09259, WO 96/029397, and WO 98/012307. Commercially
available cellulases include Celluzyme™, Carezyme™,
Endolase™, Renozyme™ (Novozymes A/S), Clazinase™ and Puradax
HA™ (Genencor International Inc.), and KAC-500(B)™ (Kao
Corporation) .
Suitable peroxidases/oxidases include those of plant,
bacterial or fungal origin. Chemically modified or protein
engineered mutants are included. Examples of useful
peroxidases include peroxidases from Coprinus, e.g. from C .
cinereus , and variants thereof as those described in WO
93/24618, WO 95/10602, and WO 98/15257. Commercially
available peroxidases include Guardzyme™ and Novozym™ 51004
(Novozymes A/S) .
Further enzymes suitable for use are discussed in
WO2009/087524, W02 009/09057 6, WO2009/107091, W02 009/111258
and WO2009/148983 .
ENZYME STABILIZERS
Any enzyme present in the composition may be stabilized
using conventional stabilizing agents, e.g., a polyol such
as propylene glycol or glycerol, a sugar or sugar alcohol,
lactic acid, boric acid, or a boric acid derivative, e.g.,
an aromatic borate ester, or a phenyl boronic acid
derivative such as 4-formylphenyl boronic acid, and the
composition may be formulated as described in e.g. WO
92/19709 and WO 92/19708.
Where alkyl groups are sufficiently long to form branched or
cyclic chains, the alkyl groups encompass branched, cyclic
and linear alkyl chains. The alkyl groups are preferably
linear or branched, most preferably linear.
The indefinite article "a" or "an" and its corresponding
definite article "the" as used herein means at least one, or
one or more, unless specified otherwise.
Dye weights refer to the sodium or chloride salts unless
otherwise stated.
Preferably the laundry treatment composition is in a plastic
bag or a cardboard box.
For ease of use it is preferred that the laundry treatment
composition is present in 0.5 to 5kg packs.
EXPERIMENTAL
Example 1
A wash solution was created in demineralised water which
contained 3.0 g/L of a laundry treatment composition
comprising 33.3wt% Linear Alkyl Benzene Sulfonate as a
Surfactant (LAS), 33.3wt% of Na2C03, and 33wt% of Na2S0 . The
dyes were added at 0.008wt% to the laundry treatment
composition. The solution was used to wash a piece of
bleached, non-mercerized, white, woven Egyptian cotton cloth
at a liquor to cloth ratio of 30:1. Washes consisted of
agitating the cloth in solution for 30 minutes, then rinsing
the cloth twice in water and drying in the air. The
experiment was repeated with the addition of dyes to the
laundry treatment composition.
The dye structures and results are summarized in Table 1
below:
Example 2
The woven cotton clothes whitened with El, E2 and Direct
Violet 9 were irradiated in a weatherometer for 2 hours with
simulated sunlight (385 /m2 300-800nm) . The relative level
of dye on the cloth before and after irradiation was
measured using a ref lectometer and expressing the spectra as
K/S = (1-R2)/2R, where R is the %ref lectance/100 . The
relative dye loss for:
Direct Violet 9 : E l : E2
was
1.0 : 0.8 : 0.6
E l and E2 are more photostable than Direct Violet
applied to cotton cloth under wash conditions.
Exemplary Base Powder Formulations A , B , C and D
Formulation A B C D
NaLAS 25 10 12 14
N I (7EO) 2 10
SDS 5 10
Soap 2
SLES (2EO) 2 2
Na tripolyphosphate 15
Zeolite A24 2 17
Sodium silicate 15 4 5 1
Sodium carbonate 35 2 0 30 2 0
Sodium sulphate 10 33 40 22
Carboxymethylcellul 0.2 0.3 0.5
ose
Polyacrylate M 0.5
4500
Sodium chloride 5
lipase 0 .005 0 .01 0 .005
Protease 0 .005 0 .01 0 .005
Amylase 0 .001 0 .003
Cellulase 0 .003
Acid Violet 50 0 .0025 0 .002 0 .0012
E l 0 .0001 0 .0003
E 2 0.0005
E 5 0 .00015
Disperse violet 2 8 0.0002 0 .0010
Fluorescer 0 .1 0.15 0 .05 0.3
Water/ impurities/ remainder remainder remainder remainder
minors
Formulations were made using Lipex as the lipase, Savinase
and Polarzyme as the protease, Carezyme as the cellulose and
Stainzyme as the amylase.
Disperse violet 2 8 is included as a post dosed 50 micron
spray dried granule containing 10% dye and 90% lignin
sulfonate .
Acid Violet 50 is added via a post dosed 75 micron spray
dried granule contain 50wt% dye, 45wt% N a 2 S C and 5 wt%
sodium carboxymethylcellulose .
The bis azo dye of the invention was added either via
addition to the detergent slurry before spray drying or a
post-dosed granule containing 0.05wt% dye on sodium
carbonate or zeolite.
Exemplary Base Liquid Formulations A , B , C and D
For both powder and liquids formulations, enzyme levels are
given as percent pure enzyme. N I (7EO) refers to R(
OCH2CH2 ) nOH , where R is an alkyl chain of C12 to C15, and n
is 7 . NaLAS is linear alkyl benzene sulphonate (LAS) and
(SLES(3EO)) is C12 -C18 alkyl polyethoxylate (3.0) sulphate,
SDS is sodium dodecyl sulphate.
We Claim:
1 . A laundry treatment composition comprising:
(i) from 2 to 70 wt% of a surfactant; and,
(ii) from 0.00001 to 0.5 wt%, of a bis-azo oxyalkylene dye,
wherein the bis-azo oxyalkylene dye is selected from
structure (I) and structure (II):
wherein :
n is selected from: 0 ; 1 ; and, 2;
Ri is H ; and C¾;
R2 is selected from: COCH 3; COC2H5; H ; and, Ph;
R 3 and R are independently selected from: H ; Me; and, Et;
P is selected from: Cl-C4-alkyl; OCl-C4-alkyl ; and, an
oxyalkylene group having one or more repeating units; and,
G is an oxyalkylene group having 1 or more repeating units.
2 . A laundry treatment composition according to claim 1 ,
wherein G is an oxyalkylene group having from 1 to 2 0
repeating units.
3 . A laundry treatment composition according to claim 1 ,
wherein the G is an oxyalkylene group selected from:
[(CH2CR5HO) (CH2CR6HO) yR7] wherein x+y < 5 , wherein y > 1 and
z = 0 to 5 , R5 is selected from: H ; CH3; CH20 (CH2CH20 )ZH and
mixtures thereof; R is selected from: H ; CH20 (CH2CH20 )ZH and
mixtures thereof; and, R 7 is selected from: H ; and, C¾ .
4 . A laundry treatment composition according to claim 1 ,
wherein the oxyalkylene group is selected from: ethylene
oxide; propylene oxide; glycidol oxide; butylene oxide; and,
mixtures thereof.
5 . A laundry treatment composition according to claim 1 ,
wherein P is Me.
6 . A laundry treatment composition according to claim 1 ,
wherein G is: (CH2CH20 )mH wherein m = 1 to 4 .
7 . A laundry treatment composition according to claim 1 ,
wherein n is selected from: 1 or 2 ;
8 . A laundry treatment composition according to any
preceding claim, wherein the dye is of structure (I) .
9 . A laundry treatment composition according to any
preceding claim, wherein laundry treatment composition
comprises a perfume in the range from 0.001 to 3 wt % ,
10. A method of treating a laundry textile, the method
comprising the steps of:
(i) treating a textile with an aqueous solution of the bis-azo oxyalkylene dye as defined in any one of the preceding claims, the aqueous solution comprising from 0.1 ppb to 500 ppm of the bis-azo oxyalkylene dye and, from 0.0 g/L to 3 g/L of a surfactant;
(ii) optionally rinsing; and,
(iii) drying the textile.