Cosmetic composition comprising 4-(3-ethoxy-4-hydroxyphenyl)-2-
butanone and a lipophilic solvent
The present invention relates to a cosmetic composition containing 4-(3-ethoxy-
4-hydroxyphenyl)-2-butanone and a particular organic solvent.
4-(3-Ethoxy-4-hydroxyphenyl)-2-butanone is an interesting substance as a
preserving agent for cosmetic compositions, for protecting the compositions
against microbial contamination.
However, this compound, which is in solid form at room temperature, is very
sparingly soluble in water or glycerol, or alternatively in 2-octyldodecanol.
Now, it is necessary for this compound to be formulated in a solubilized form in
order to fully exploit its activity, and it is also preferable for its solubilization to be
maintained over time in order to avoid any recrystallization during storage of
compositions comprising such a compound.
The object of the present invention is, precisely, to propose a novel galenical
formulation of 4-(3-ethoxy-4-hydroxyphenyl)-2-butanone that overcomes the
abovementioned drawbacks, and thus enables this compound to be incorporated
in a long-lasting solubilized form.
Specifically, the inventors have discovered, unexpectedly, that the combination of
4-(3-ethoxy-4-hydroxyphenyl)-2-butanone with at least one particular organic
solvent enables this compound to be solubilized while avoiding its
recrystallization, especially after storage for two months at room temperature
(25°C).
More precisely, a subject of the invention is a composition, especially a cosmetic
composition, comprising, in a physiologically acceptable oily medium,
4-hydroxyphenyl)-2-butanone and an organic solvent with solubility parameters in
the Hansen solubility space such that 4.5 < a < 7 and 14 < < 22.
A further subject of the invention is a process for the non-therapeutic cosmetic
treatment of keratin materials, comprising the application to the keratin materials
of a composition as described previously. The process may be a cosmetic
process for caring for, making up or cleansing keratin materials.
As specified hereinbelow, 4-(3-ethoxy-4-hydroxyphenyl)-2-butanone is
advantageously present in the compositions in accordance with the invention in a
solubilized form.
4-(3-Ethoxy-4-hydroxyphenyl)-2-butanone is a compound of formula:
The compound 4-(3-ethoxy-4-hydroxyphenyl)-2-butanone may be present in the
composition according to the invention in a content ranging from 0.01 % to 10%
by weight, better still from 0.1 % to 7% by weight, from 0.5% to 7% by weight,
from 0.75% to 5% by weight and preferably ranging from 1% to 5% by weight,
relative to the total weight of the composition.
The composition according to the invention comprises an effective amount of at
least one organic solvent with solubility parameters in the Hansen solubility
space such that 4.5 < a < 7 and 14 < < 22.
The global solubility parameter d according to the Hansen solubility space is
defined in the article "Solubility parameter values" by Eric A. Gruike in the book
"Polymer Handbook", 3rd Edition, Chapter VII, pp. 5 19-559, by the relationship:
d = (d2 = dϋ
2 + dr
2 +d 2) 2
in which:
- characterizes the London dispersion forces derived from the formation of
dipoles induced during molecular impacts,
- dr characterizes the Debye interaction forces between permanent dipoles, and
- 8 characterizes the specific interaction forces (such as hydrogen bonding,
acid/base, donor/acceptor, etc.). The definition of solvents in the Hansen threedimensional
solubility space is described in the article by CM. Hansen: "The
three-dimensional solubility parameters", J . Paint Technol. 39, 105 (1967).
The parameter d is defined by the following relationship: d 2 = dr
2 + = d2 - ¾2
The parameters ¾, dr, 0 h and d are expressed in (J/cm ) 2.
Preferably, the organic solvent has solubility parameters such that
4.5 < d < 7 and 4 < < 17
Preferentially, the organic solvent has solubility parameters such that
6 < d < 7 and 16 < < 17
The organic solvent used according to the invention may be chosen from
isopropyl N-lauroyl sarcosinate (d = 4.91 ; = 14.9), capric/caprylic acid
triglycerides (d = 6.7; = 16.60) such as the product sold by the company
Stearineries Dubois or the product sold under the name Miglyol 812 N by the
company Sasol; 2-phenylethyl benzoate (X-Tend 226 from ISP) ( a = 6.36; =
2 1.48), isopropyl palmitate ( a = 4.74; d = 16.1 0), isopropyl myristate ( a = 5.00;
= 16.00).
Preferably, the organic solvent is chosen from isopropyl N-lauroyl sarcosinate,
capric/caprylic acid triglycerides (60/40); 2-phenylethyl benzoate (X-Tend 226
from ISP).
Preferentially, the organic solvent is chosen from isopropyl N-lauroyl sarcosinate
and capric/caprylic acid triglycerides.
The solvent may be present in the composition according to the invention in a
content ranging from 0.05% to 30% by weight, better still from 0.05% to 10% by
weight, preferably ranging from 0.1 % to 5% by weight and preferentially ranging
from 0.1 % to 2.5% by weight, relative to the total weight of the composition.
According to one embodiment, the organic solvent in accordance with the
invention and the 4-(3-ethoxy-4-hydroxyphenyl)-2-butanone (referred to as the
compound) may be present in a solvent/compound mass ratio of less than or
equal to 10 , especially less than or equal to 5 , better still less than or equal to 4 ,
especially ranging from 0.5 to 4 and preferably ranging from 0.5 to 1.5.
The compositions used according to the invention contain a physiologically
acceptable medium, i.e. a medium that is compatible with human keratin
materials such as the skin, the scalp, the hair and the nails.
The composition may comprise at least one additional oil. As oils that may be
used, examples that may be mentioned include:
- hydrocarbon-based oils of plant origin, such as liquid triglycerides of fatty acids
containing from 4 to 10 carbon atoms, for instance heptanoic or octanoic acid
triglycerides, or alternatively, for example, sunflower oil, maize oil, soybean oil,
marrow oil, grapeseed oil, sesame seed oil, hazelnut oil, apricot oil, macadamia
oil, arara oil, castor oil, avocado oil, jojoba oil and shea butter oil;
- synthetic esters and ethers, especially of fatty acids, for instance the oils of
formulae R1COOR2 and R1OR2 in which Ri represents a fatty acid residue
containing from 8 to 29 carbon atoms and R2 represents a branched or
unbranched hydrocarbon-based chain containing from 3 to 30 carbon atoms, for
instance Purcellin oil, isononyl isononanoate, 2-ethylhexyl palmitate, 2-
octyldodecyl stearate, 2-octyldodecyl erucate or isostearyl isostearate;
hydroxylated esters, for instance isostearyl lactate, octyl hydroxystearate,
octyldodecyl hydroxystearate, diisostearyl malate or triisocetyl citrate; fatty
alcohol heptanoates, octanoates or decanoates; polyol esters, for instance
propylene glycol dioctanoate, neopentyl glycol diheptanoate and diethylene
glycol diisononanoate; and pentaerythritol esters, for instance pentaerythrityl
tetraisostearate;
- linear or branched hydrocarbons of mineral or synthetic origin, such as volatile
or non-volatile liquid paraffins, and derivatives thereof, petroleum jelly,
polydecenes, and hydrogenated polyisobutene such as Parleam oil;
- fatty alcohols containing from 8 to 26 carbon atoms, for instance cetyl alcohol,
stearyl alcohol and a mixture thereof (cetylstearyl alcohol), octyldodecanol, 2-
butyloctanol, 2-hexyldecanol, 2-undecylpentadecanol, oleyl alcohol or linoleyl
alcohol;
- silicone oils, for instance volatile or non-volatile polymethylsiloxanes (PDMS)
with a linear or cyclic silicone chain, which are liquid or pasty at room
temperature, especially cyclopolydimethylsiloxanes (cyclomethicones) such as
cyclohexasiloxane; polydimethylsiloxanes comprising alkyl, alkoxy or phenyl
groups, which are pendent or at the end of a silicone chain, these groups
containing from 2 to 24 carbon atoms; phenylsilicones, for instance phenyl
trimethicones, phenyl dimethicones, phenyltrimethylsiloxydiphenylsiloxanes,
diphenyl dimethicones, diphenylmethyldiphenyltrisiloxanes or 2-phenylethyl
trimethylsiloxy silicates, and polymethylphenylsiloxanes;
- mixtures thereof.
In the list of oils mentioned above, the term "hydrocarbon-based oil" means any
oil mainly comprising carbon and hydrogen atoms, and possibly ester, ether,
fluoro, carboxylic acid and/or alcohol groups.
The composition according to the invention may comprise substances that are
solid at room temperature (25°C), for instance fatty acids comprising from 8 to 30
carbon atoms, such as stearic acid, lauric acid, palmitic acid and oleic acid;
waxes such as lanolin, beeswax, carnauba wax or candelilla wax, paraffin waxes,
microcrystalline waxes, ceresin or ozokerite, and synthetic waxes such as
polyethylene waxes and Fischer-Tropsch waxes.
These fatty substances may be chosen in a varied manner by a person skilled in
the art so as to prepare a composition having the desired properties, for example
in terms of consistency or texture.
The composition according to the invention may comprise an aqueous phase.
The composition may comprise water, which may be present in a content ranging
from 5% to 80% by weight and preferably ranging from 35% to 75% by weight
relative to the total weight of the composition.
The composition may also comprise a polyol that is water-miscible at room
temperature (25°C) chosen especially from polyols especially containing from 2
to 20 carbon atoms, preferably containing from 2 to 10 carbon atoms and
preferentially containing from 2 to 6 carbon atoms, such as glycerol, propylene
glycol, butylene glycol, pentylene glycol, hexylene glycol, dipropylene glycol and
diethylene glycol. This polyol is different from the organic solvents in accordance
with the invention.
The compositions according to the invention may be in the form of oil-in-water
(O/W) emulsions, water-in-oil (W/O) emulsions or multiple emulsions (triple:
W/O/W or 0/W/O), oily solutions or oily gels. These compositions are prepared
according to the usual methods.
According to one particular embodiment of the invention, the composition
according to the invention is a water-in-oil (W/O) or oil-in-water (O/W) emulsion.
The proportion of the oily phase of the emulsion may range from 5% to 80% by
weight and preferably from 5% to 50% by weight relative to the total weight of the
composition.
The emulsions generally contain at least one emulsifier chosen especially from
amphoteric, anionic, cationic and nonionic emulsifiers, used alone or as a
mixture, and optionally a co-emulsifier. The emulsifiers are appropriately chosen
according to the emulsion to be obtained (W/O or O/W). The emulsifier and the
co-emulsifier are generally present in the composition in a proportion ranging
from 0.3% to 30% by weight and preferably from 0.5% to 20% by weight relative
to the total weight of the composition.
For W/O emulsions, examples of emulsifiers that may be mentioned include
dimethicone copolyols, such as the mixture of cyclomethicone and dimethicone
copolyol sold under the trade name DC 5225 C by the company Dow Corning,
and alkyl dimethicone copolyols such as the lauryl dimethicone copolyol sold
under the name Dow Corning 5200 Formulation Aid by the company Dow
Corning, and the cetyl dimethicone copolyol sold under the name Abil EM 90® by
the company Goldschmidt. A crosslinked elastomeric solid organopolysiloxane
comprising at least one oxyalkylene group, such as those obtained according to
the procedure of Examples 3 , 4 and 8 of patent US-A-5 412 004 and of the
examples of patent US-A-5 8 11 487, especially the product of Example 3
(synthesis example) of patent US-A-5 412 004, such as the product sold under
the reference KSG 2 1 by the company Shin-Etsu, may also be used as
surfactants for W/O emulsions.
For O/W emulsions, examples of emulsifiers that may be mentioned include
nonionic emulsifiers such as oxyalkylenated (more particularly
polyoxyethylenated) fatty acid esters of glycerol; oxyalkylenated fatty acid esters
of sorbitan; oxyalkylenated (oxyethylenated and/or oxypropylenated) fatty acid
esters; oxyalkylenated (oxyethylenated and/or oxypropylenated) fatty alkyl
ethers; sugar esters such as sucrose stearate; and mixtures thereof, such as the
mixture of glyceryl stearate and PEG-40 stearate (polyethylene glycol stearate
containing 40 ethylene glycol units).
In a known manner, the composition according to the invention may also contain
adjuvants that are common in cosmetics or dermatology, such as gelling agents,
film-forming polymers, preserving agents, fragrances, fillers, UV-screening
agents, bactericides, odour absorbers, dyestuffs, plant extracts, cosmetic and
dermatological active agents, and salts. The amounts of these various adjuvants
are those conventionally used in the field under consideration, for example from
0.01 % to 20% of the total weight of the composition.
The invention is illustrated in greater detail in the example that follows. The
amounts of the ingredients are expressed as weight percentages.
Example 1: Solubility test
The solubility tests were performed with 4-(3-ethoxy-4-hydroxyphenyl)-2-
butanone.
The test solvent was poured into a beaker, an amount of the compound was
added with magnetic stirring and the mixture was left to stand for between 1 hour
and 24 hours. The mixture was then heated to 50°C and then cooled to room
temperature (25°C) over 24 hours. The system was then observed to see if the
amount of compound introduced recrystallized or remained dissolved.
The amount of compound that can be dissolved in the test solvent was
determined in this manner. The maximum value corresponds to the amount at
and above which the ester compound stops dissolving in the evaluated solvent.
The following results were obtained in several evaluated solvents:
Solvent Degree of solubilization
(weight%)
Water * < 1
2-Ethylhexyl palmitate * 10
2-Octyldodecanol * 10
Isopropyl N-lauroyl > 20
sarcosinate
Capric/caprylic acid > 20
triglycerides ( 1 )
2-Phenylethyl benzoate > 20
* solvent not forming part of the invention
( 1 ) 70/30 C8-C1 0 Triglycerides (Dub MCT 7030) from Stearineries Dubois
It was thus found that the solvents such as 2-phenylethyl benzoate, isopropyl Nlauroyl
sarcosinate and capric/caprylic acid triglycerides dissolved the active
agent, whereas 2-ethylhexyl palmitate ( a = 4.23; = 16.20) and 2-
octyldodecanol ( a = 7.70; = 16.40) dissolved the active agent less well.
Example 2:
A facial care cream (oil-in-water emulsion) having the following composition was
prepared:
Xanthan gum (Rhodicare XC from Rhodia) 0.1 5
Mixture of glyceryl stearate and PEG-1 00 stearate
(Arlacel® 165 FL from Uniqema) 2.5
1,3-Butylene glycol 0.525
Stearyl alcohol 1
Stearic acid 1.2
Capric/caprylic acid triglycerides
(70/30 C8-C1 0 Triglycerides (Dub MCT 7030)
from Stearineries Dubois) 5
Acrylamide/sodium acrylamido-2-methylpropanesulfonate
copolymer as a reverse emulsion at 40% in isoparaffin/water
(Sepigel 305 from SEPPIC) 1.7
Sodium hyaluronate (Cristalhyal from Soliance) 0.05
4-(3-Ethoxy-4-hydroxyphenyl)-2-butanone 2
Glycerol
Cetyl alcohol
Tocopheryl acetate
Cyclopentasiloxane
Water
The composition is stable and homogeneous after storage for 2 months at 45°C.
Example 3:
A body milk having the following composition was prepared:
2-Ethylhexyl palmitate 7
Citric acid 0.06
Glycerol 3
Xanthan gum (Keltrol CG-T from CP Kelco) 0.1
Polymerized acrylic acid/stearyl methacrylate copolymer
in an ethyl acetate/cyclohexane mixture
(Pemulen TR-1 Polymer from Noveon) 0.1
4-(3-Ethoxy-4-hydroxyphenyl)-2-butanone 2
Mixture of corn oil, rice bran oil, sesame oil and
wheatgerm oil (29/40/20/1 0) 5
Triethanolamine 0.4
Carboxyvinyl polymer (Synthalen K from 3V) 0.3
Acrylamide/sodium acrylamido-2-methylpropanesulfonate
copolymer as a reverse emulsion at 40% in isoparaffin/water
(Sepigel 305 from SEPPIC) 0.5
Water qs 100
The composition is stable and homogeneous after storage for 2 months at 45°C.
Example 4 :
A facial care cream (water-in-oil emulsion) having the following composition was
prepared:
Ethanol 5
Polydimethylsiloxane 10 cSt 6.75
Mixture of acetylated ethylene glycol stearate and glyceryl
tristearate (Unitwix from United Guardian) 0.5
Aluminium salt of corn starch esterified with
octenylsuccinic anhydride
(Dry Flo Plus 28-1 160 from National Starch) 3
Liquid fraction of shea butter (Shea Olein from Olvea) 4
Polyglyceryl-4 isostearate (Gl 34 from Goldschmidt) 0.5
4-(3-Ethoxy-4-hydroxyphenyl)-2-butanone 2
Apricot kernel oil 1.4
Vinylidene chloride/acrylonitrile/methyl methacrylate
copolymer microspheres expanded with isobutane
(Expancel 551 DE 40 D42 from Expancel) 0.1
Magnesium sulfate 0.7
Hydrogenated polyisobutene
(Parleam from NOF Corporation) 10
Capric/caprylic acid triglycerides
(70/30 C8-C1 0 Triglycerides (Dub MCT 7030)
from Stearineries Dubois) 5
Cetyl dimethicone copolyol
(Abil EM 90 from Goldschmidt) 1.5
Water qs 100
The composition is stable and homogeneous after storage for 2 months at 45°C.
CLAIMS
1. Composition comprising, in a physiologically acceptable oily medium,
4-(3-ethoxy-4-hydroxyphenyl)-2-butanone and an organic solvent with solubility
parameters in the Hansen solubility space such that 4.5 < a < 7 and
14 < d < 22.
2 . Composition according to the preceding claim, characterized in that the
organic solvent is chosen from isopropyl N-lauroyl sarcosinate, capric/caprylic
acid triglycerides, 2-phenylethyl benzoate, isopropyl palmitate and isopropyl
myristate.
3 . Composition according to either of the preceding claims, characterized in that
the organic solvent is chosen from isopropyl N-lauroyl sarcosinate and
capric/caprylic acid triglycerides.
4 . Composition according to any one of the preceding claims, characterized in
that the organic solvent is present in a content ranging from 0.05% to 30% by
weight, better still from 0.05% to 10% by weight, preferably ranging from 0.1 % to
5% by weight and preferentially ranging from 0.1 % to 2.5% by weight relative to
the total weight of the composition.
5 . Composition according to any one of the preceding claims, characterized in
that the 4-(3-ethoxy-4-hydroxyphenyl)-2-butanone is present in a content ranging
from 0.01 % to 10% by weight, better still from 0.1 % to 7% by weight, from 0.5%
to 7% by weight, from 0.75% to 5% by weight and preferably ranging from 1% to
5% by weight, relative to the total weight of the composition.
6 . Composition according to any one of the preceding claims, characterized in
that the said organic solvent and the 4-(3-ethoxy-4-hydroxyphenyl)-2-butanone
are present in an organic solvent/4-(3-ethoxy-4-hydroxyphenyl)-2-butanone mass
ratio of less than or equal to 10 , especially less than or equal to 5 and better still
less than or equal to 4 , especially ranging from 0.5 to 4 and preferably ranging
from 0.5 to 1.5.
7 . Composition according to any one of the preceding claims, characterized in
that it comprises an additional oil.
8 . Composition according to any one of the preceding claims, characterized in
that it is in the form of a water-in-oil or oil-in-water emulsion, preferably an oil-inwater
emulsion.
9 . Non-therapeutic cosmetic treatment process for caring for and/or making up
and/or cleansing keratin materials, comprising the application to the said keratin
materials of a composition according to any one of the preceding claims.