Oily cosmetic composition containing, as a thickener, an associa

Details Oily cosmetic composition containing, as a thickener, an associa Oily cosmetic composition containing, as a thickener, an associa

1993-05-10

1996-05-21

Mullis, Jeffrey

Drug, bio-affecting and body treating compositions

Designated organic nonactive ingredient containing other...

Solid synthetic organic polymer

5147726, 514844, 514938, 525203, A61K 748, A61K 706

Patent

active

055190634

DESCRIPTION:

BRIEF SUMMARY
This invention relates to the use in association, as a thickening agent for an oily cosmetic composition, of two copolymers having distinct units.
Numerous cosmetic compositions are known which are intended, principally, to be applied to the skin, lips, eyelashes and hair, and which are provided in the form of oily solutions or in the form of emulsions. The preparation of these compositions generally requires thickening the oily phase principally to facilitate their application.
It is also necessary to thicken the oily phase when it is desired to obtain a composition in the form of a gel, for example, an anhydrous gel. The formulation, in the form of an anhydrous gel, is employed when the substances present in the composition are sensitive to humidity and/or to the oxygen of the air. Moreover, it is known that oils have very interesting cosmetic properties (principally cleansing, makeup removal and emollient properties), but that their use is not convenient because they are too fluid. In fact, their application is only slightly satisfactory when they are provided in the form other than a thick oily composition or gel.
A known method of thickening oily compositions consists in incorporating a wax in the oily phase. However, compositions thickened with a wax have a feel which is generally considered disagreeable.
There has also been employed oil thickening techniques based on the incorporation of silicas, bentones or metallic salts of fatty acids, (for example aluminum salts) or of esterification derivatives of sugars, (for example dextrine palmitate) etc.
However, none of these procedures provides a composition possessing both the transparency and consistency of a gel.
It has now been discovered that it is possible to obtain a thickening, which is principally capable of reconciling these requirements, in the production of cosmetic compositions, notwithstanding the nature of the oil or mixture of oils employed.
It has also been discovered that the rheologic and cosmetic properties of the compositions thus obtained can be modified and improved, if desired, by using a rheologic corrector agent, and principally certain amphiphilic agents, as detailed more fully below.
The gels obtained in accordance with the invention do not have a brittle texture, that is to say, that they can be removed easily with the finger by adherence to it and they do not have a stringy texture, that is to say, they do not flow in a viscous stream as does, for example, liquid honey.
One of the advantages of the use of polymers for thickening cosmetic compositions is that they do not pass through the cutaneous barrier, so that there is no need to fear systemic toxicity.
Another advantage of the use of polymers is that it is possible to obtain significant thickening with a relatively small amount of the thickening agent.
Moreover, the advantage of the use of a system based on the combination of two polymers is that each of the polymers, before mixing, gives fluid solutions, which facilitate preparation techniques, by avoiding principally significant dissolution times and by avoiding the presence of insoluble impurities in the medium after mixing.
The present invention thus relates to a thickening agent for oils in a cosmetic composition comprising an oily phase, the said thickening agent comprising at least a first copolymer comprising units derived from at least one lipophilic monomer and units A derived from at least one hydrophilic monomer comprising at least one carboxylic or sulfonic acid group, and at least a second copolymer comprising units derived from at least one lipophilic monomer and units B derived from at least one hydrophilic monomer comprising at least an amine, amide, alcohol, or ether group, the said first and second copolymers having a molecular mass not lower than about 100,000.
In particular embodiments, the use of the thickening agent according to the invention can also exhibit the following characteristics, taken singly or, the case being, in combination: from the lipophilic monomer is at least equal to 50%; and the

REFERENCES:
patent: 4839166 (1989-06-01), Grollier et al.
patent: 4842849 (1989-06-01), Grollier et al.

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