Drug – bio-affecting and body treating compositions – Preparations characterized by special physical form – Cosmetic – antiperspirant – dentifrice
Reexamination Certificate
1999-06-14
2001-07-17
Dodson, Shelley A. (Department: 1616)
Drug, bio-affecting and body treating compositions
Preparations characterized by special physical form
Cosmetic, antiperspirant, dentifrice
C424S059000, C424S070100, C424S070110, C424S070130, C424S070160, C424S070900
Reexamination Certificate
active
06261578
ABSTRACT:
The present invention relates to cosmetic compositions containing, in combination, at least one polysaccharide and an acrylic terpolymer, as well as to the use of these compositions for the treatment of keratinous material, in particular the skin and the hair.
The polymers of polysaccharide type give a very good styling effect on the hair. However, most are not thickeners or, if they are, they give gels of insufficient viscosity or of runny texture.
It is then necessary, when it is desired to present them in the form of a styling gel or a care gel, to combine them with a thickener which gives them an adequate texture while at the same time retaining the good cosmetic performance of these products.
The thickeners most commonly used are generally based on crosslinked acrylic polymers, such as the products sold under the name “Carbopol” by the company Goodrich and those sold under the name “Synthalen K” by the company 3V. When used in combination with polysaccharides, these polymers usually lead to gels of unsatisfactory texture which are also unsatisfactory in terms of the cosmetic results since they do not give the hair good disentangling or softness properties; they do not have good fixing power either. Other thickening and/or gelling polymers are known which contain in their chain a hydrophilic part and a hydrophobic part consisting of a fatty chain, such as the product “Pemulen TR
1
” sold by the company Goodrich or the “Acrysol” polymers sold by the company Rohm & Haas. The polymer “Pemulen TR
1
”, used in combination with polysaccharides, does not lead to a gel of satisfactory texture and does not give satisfactory cosmetic results, in particular as regards the fixing power. The polymer “Acrysol 44”, in combination with a polysaccharide, leads to a very fluid and cloudy product.
The Applicant has discovered, surprisingly, that by using a novel family of thickening and/or gelling polymers and by combining them with polysaccharides, it is possible to obtain cosmetic formulations which have a satisfactory viscosity at a relatively low pH, which are not pasty, which spread well on the skin and hair and which give the hair good properties of softness and easy disentangling while at the same time having good fixing properties.
The subject of the present invention is thus cosmetic compositions containing, in a cosmetically acceptable aqueous support, at least one polysaccharide and an acrylic terpolymer which will be defined in greater detail later in the description.
This polymer makes it possible in particular to prepare leave-in or rinse-out, aqueous-organic or aqueous compositions containing cosmetically acceptable solvents, ranging from lightly gelled products to sticks or solid tubes.
The advantages of this terpolymer are that it is stable in electrolytic medium and has very good thickening power at a pH equal to or above 5.5, making it possible to achieve a good level of viscosity and to be able to use high concentrations of alcohol.
When used in combination with at least one polysaccharide, this polymer makes it possible to prepare gelled, non-pasty products which are easy to spread, soft to apply and have good fixing power. I This polymer also makes it possible to improve the conditioning effect of the polysaccharides on the hair, in particular its feel.
The acrylic terpolymer used in accordance with the invention is soluble or swellable in alkalis. It is characterized in that it comprises:
a) about 20 to 70% by weight, preferably 25 to 55% by weight, of a carboxylic acid containing a, &bgr;-monoethylenic unsaturation;
b) about 20 to 80% by weight, preferably 30 to 65% by weight, of a non-surfactant monomer containing monoethylenic unsaturation, which is different from a), and
c) about 0.5 to 60% by weight, preferably 10 to 50% by weight, of a nonionic urethane monomer which is the product of reaction of a monohydric nonionic surfactant with a monoisocyanate containing monoethylenic unsaturation.
The carboxylic acid containing &agr;, &bgr;-monoethylenic unsaturation a) can be chosen from many acids and in particular acrylic acid, methacrylic acid, itaconic acid and maleic acid. Methacrylic acid is preferred. A large proportion of acid is essential in order to give a polymer structure which dissolves and gives a thickening effect by reaction with an alkaline compound such as sodium hydroxide, alkanolamines, aminomethylpropanol or aminomethyl-propanediol.
The terpolymer should also contain a large proportion, indicated above, of a monomer b) containing monoethylenic unsaturation which has no surfactant properties. The preferred monomers are those which give polymers that are water-insoluble when they are homopolymerized and are illustrated by C
1
-C
4
alkyl acrylates and methacrylates such as methyl acrylate, ethyl acrylate and butyl acrylate, or corresponding methacrylates. The monomers more particularly preferred are methyl and ethyl acrylates. Other monomers which can be used are styrene, vinyltoluene, vinyl acetate, acrylonitrile and vinylidene chloride. Non-reactive monomers are preferred, such monomers being those in which the single ethylenic group is the only group which is reactive under the polymerization conditions. However, monomers which contain groups that are reactive under the action of heat can be used in certain situations, such as hydroxyethyl acrylate.
The monohydric nonionic surfactants used to obtain the nonionic urethane monomer c) are well known and are generally alkoxylated hydrophobic compounds containing an alkylene oxide forming the hydrophilic part of the molecule. The hydrophobes generally consist of an aliphatic alcohol or an alkylphenol in which a carbon chain containing at least six carbon atoms constitutes the hydrophobic part of the surfactant.
The preferred monohydric nonionic surfactants have the formula:
in which R is a C
6
-C
30
alkyl or C
8
-C
30
aralkyl group, R′ is a C
1
-C
4
alkyl group, n is an average number ranging approximately from 5 to 150 and m is an average number ranging approximately from 0 to 50, with the condition that n is at least as large as m and that n+m=5-150.
As preferred C
6
-C
30
alkyl groups, mention may be made of dodecyl and C
18
-C
26
alkyl radicals. As aralkyl groups, mention may be made more particularly of (C
8
-C
13
)alkylphenyl groups. The preferred group R′ is the methyl group.
The monoisocyanate containing monoethylenic unsaturation which is used to form the nonionic urethane monomer c) can be chosen from a wide variety of compounds. A compound containing any copolymerizable unsaturation such as acrylic or methacrylic unsaturation can be used. An allylic unsaturation imparted by allyl alcohol can also be used. The preferred monoethylenic monoisocyanate is &agr;,&agr;-dimethyl-m-isopropenyl-benzylisocyanate.
The acrylic terpolymer defined above is obtained by aqueous emulsion copolymerization of the components a), b) and c) which is entirely common and described in patent application EP-A-0,173,109.
As terpolymers which can be used according to the invention, mention may be made of the products of reaction of methacrylic acid as component a), of ethyl acrylate as component b) and of a nonionic urethane macromonomer as component c), having the following structure:
in which p′ ranges from 6 to 150 and is preferably equal to 30 and R
2
is a C
8
-C
13
alkyl radical, such as that described in Example 3 of patent application EP-A-0,173,109.
The preferred acrylic terpolymer used according to the invention is obtained from methacrylic acid as component a), methyl acrylate as component b) and a nonionic urethane macromonomer as component c), having the following structure:
in which p ranges from 6 to 150 and R
1
is a C
18
-C
26
alkyl radical, preferably C
20
-C
24
linear, of plant origin, such as the docosyl radical.
The acrylic terpolymer is present in the cosmetic compositions of the invention in concentrations ranging from 0.01 to 20% by weight relative to the total weight of the composition, and preferably from 0.1 to 10% by weight.
According to the present inv
Dodson Shelley A.
Jacobson Price Holman & Stern PLLC
L'Oreal
Lamm Marina
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