Drug – bio-affecting and body treating compositions – Preparations characterized by special physical form – Cosmetic – antiperspirant – dentifrice
Patent
1994-08-19
1997-02-18
Sweet, Mark D.
Drug, bio-affecting and body treating compositions
Preparations characterized by special physical form
Cosmetic, antiperspirant, dentifrice
424450, 424 45, 424 59, 424 61, 524460, A61K 600
Patent
active
056039395
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to new film-forming cosmetic compositions containing, in a suitable vehicle, a chlorinated graft copolymer resulting from the grafting of a chlorinated polyolefin and acrylic, styrene and/or vinyl type unsaturated monomers.
Synthetic polymers and copolymers constitute essential ingredients of a large number of film-forming cosmetic compositions, such as hair fixing compositions, for example lacquers and setting lotions, or nail varnishes.
A very large number of polymers and copolymers have already been proposed, but few of them are capable of being used equally well in cosmetic compositions as different as hair-care products for fixing the hair and nail varnishes.
It has now been discovered that a certain class of copolymers resulting from the grafting of chlorinated polyolefins with unsaturated monomers yields cosmetic compositions of very diverse kinds, and that the latter bring about an improvement in the cosmetic properties, especially a better adhesion and sheen on keratinous substances such as eyelashes and hair, or alternatively on the nails.
It was established, more especially, that the adhesion of varnish was improved especially significantly by the use of such copolymers in nail varnishes.
The subject of the present invention is hence a film-forming cosmetic composition containing, in a suitable cosmetic vehicle, at least one chlorinated graft copolymer resulting from the grafting of 5 to 20% of a chlorinated polyolefin with 80 to 95% of acrylic, styrene and/or vinyl type unsaturated monomers, it being possible for the monomers to be chosen from oleophilic monomers, taken separately or mixed in a proportion of 0 to 95%, and hydrophilic monomers, also taken separately or mixed in a proportion of 0 to 40%.
According to the invention, the chlorinated polyolefins leading to the production of the chlorinated graft copolymer are characterized by an average molecular weight of between 8,000 and 140,000, and a chlorine content of between 15 and 40%.
Among unsaturated monomers, those of the oleophilic type are, more especially, styrene and alkyl, especially butyl, acrylates and methacrylates. Among unsaturated monomers of hydrophilic type, acrylic acid, methacrylic acid and 2-hydroxyethyl or 2-hydroxypropyl acrylates or methacrylates may be mentioned.
When the chlorinated graft copolymer is, more especially, intended for the production of a cosmetic composition in the form of nail varnish, the unsaturated monomers are of the oleophilic type, whereas when the chlorinated graft copolymer is intended for a hair-care cosmetic composition, the unsaturated monomers are of the hydrophilic type and more especially acrylic or methacrylic acid.
According to a preferred embodiment, the unsaturated monomers are in the form of a mixture consisting of styrene, butyl methacrylate, methacrylic acid and 2-hydroxyethyl methacrylate.
The chlorinated graft copolymers as defined above, present in the cosmetic compositions according to the invention, are obtained according to traditional polymer grafting processes, which consist in subjecting a chlorinated polyolefin dissolved in an organic solvent, for example xylene, to a grafting reaction using a suitable catalyst in the presence of at least one unsaturated monomer. After reaction has been allowed to proceed at the appropriate temperature, a secondary catalyst is optionally introduced, reaction is continued and the chlorinated graft copolymer is then isolated.
The grafting catalyst may be chosen, for example, from peroxides such as benzoyl peroxide, perbenzoates such as tert-butyl perbenzoate, hydroperoxides such as dicumyl hydroperoxide and diazo compounds such as 2,2'-azobis(isobutyronitrile) or 2,2'-azobis(2-methylbutyronitrile).
The secondary catalyst optionally used in the process is preferably chosen from dicumyl peroxide and di-tert-butyl peroxide.
The temperature of the grafting reaction is generally above 120.degree. C., but preferably does not exceed 140.degree. C.
The chlorinated graft copolymers obtained by the process as described
REFERENCES:
patent: 4283384 (1981-08-01), Jacquet et al.
patent: 4683007 (1987-07-01), Horowitz et al.
patent: 5057312 (1991-10-01), Langla et al.
patent: 5143723 (1992-09-01), Calvo et al.
"L'Oreal"
Sweet Mark D.
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