Drug – bio-affecting and body treating compositions – Preparations characterized by special physical form – Cosmetic – antiperspirant – dentifrice
Reexamination Certificate
1999-06-14
2004-03-09
Dodson, Shelley A. (Department: 1616)
Drug, bio-affecting and body treating compositions
Preparations characterized by special physical form
Cosmetic, antiperspirant, dentifrice
C424S059000, C424S400000, C514S861000, C514S863000, C514S864000, C514S937000
Reexamination Certificate
active
06703026
ABSTRACT:
The present invention relates to cosmetic compositions containing, in combination, at least one polyorganosiloxane and an acrylic terpolymer, as well as to the use of these compositions for treating keratinous material.
Silicones are cosmetic products which are particularly sought for their conditioning properties and their softening and disentangling properties, in particular in hair formulations.
When certain silicones are used, such as those which are insoluble in aqueous medium, it is often necessary to introduce them in a thickened or gelled support in order to keep them in suspension and to obtain a stable composition.
It is also important to have available non-pasty, non-greasy compositions which spread well on the skin and the hair.
With the aim of obtaining a thickened or gelled support, thickening and/or gelling polymers are used. 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 TR1” sold by the company Goodrich or the “Acrysol” polymers sold by the company Rohm & Haas. The polymer “Pemulen TR1” gives formulations of pasty texture which do not spread well. The polymer “Acrysol” does not have good gelling power and gives cloudy, unstable formulations.
The Applicant has discovered, surprisingly, that by using a novel family of thickening and/or gelling polymers and by combining them with polyorganosiloxanes, cosmetic formulations which have a satisfactory viscosity at a relatively low pH, which are stable, non-greasy, non-pasty and which spread well on the skin and the hair can be obtained.
The subject of the present invention is thus cosmetic compositions containing, in a cosmetically acceptable aqueous support, at least one polyorganosiloxane and an acrylic terpolymer which will be defined in greater detail later in the description.
This polymer makes it possible in particular to prepare rinse-out or leave-in, aqueous or aqueous-organic compositions containing cosmetically acceptable solvents, ranging from slightly gelled products to solid sticks or 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, which allows a good level of viscosity to be achieved and allows high concentrations of alcohol to be used.
When used in combination with at least one polyorganosiloxane, this polymer makes it possible to prepare gelled, non-pasty products which are easy to spread, feel soft when applied and are stable on storage.
It also makes it possible to improve the conditioning effect of silicones on the hair, in particular their feel, their softness and their disentangling ability.
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 &agr;,&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;-mono-ethylenic 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 aminomethylpropanediol.
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 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.
The modified or non-modified polyorganosiloxanes used in the compositions according to the present invention are polyorganosiloxane oils or polyorganosiloxane gums or resins, in their natural state or in the form of solutions in organic solvents, or alternatively in the form of emulsions or microemulsions.
Among the polyorganosiloxanes used in accordance with the present invention, mention may be made, in a non-limiting manner, of:
I. Volatile Silicones
These have a boiling point of between 60° C. and 260° C. They are chosen from cyclic silicones containing from 3 to 7 and preferably 4 to 5 silicon atoms. They are, for example,
Dodson Shelley A.
L'Oreal
Nixon & Vanderhye P.C.
LandOfFree
Cosmetic composition containing a polyorganosiloxane and an... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Cosmetic composition containing a polyorganosiloxane and an..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Cosmetic composition containing a polyorganosiloxane and an... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3223074