Cosmetic kaolin-containing preparation

Details Cosmetic kaolin-containing preparation Cosmetic kaolin-containing preparation

1997-05-09

1998-02-10

Owens, Amelia Averill

Drug, bio-affecting and body treating compositions

Effervescent or pressurized fluid containing

Organic pressurized fluid

514951, A61K 700

Patent

active

057165998

DESCRIPTION:

BRIEF SUMMARY
This application is a 371 of PCT/DE95/01801 filed Dec. 6, 1995 published as WO96/17588 Jun. 13, 1996.
The invention pertains to new preparations containing kaolin which may be employed in cosmetics in the form of emulsions or gels.
It is known that inflammation may be inhibited to a degree through the addition of kaolin to certain dermatological preparations. Previously, kaolin additives of up to 2% by weight were possible while maintaining a consistently pleasant sensation on the skin; the emulsion tended to clot severely above this limit. The addition of a greater proportion also led to the dulling of the emulsion, an effect that cannot be tolerated in cosmetics.
Substrates in platelet form of a certain size, e.g. of zeolite, mica or glass, containing a proportion of spherical particles for the prevention of agglomeration are known from EP-B-406657. A composite powder coated with aluminum metasilicate which may also contain kaolin and which has improved adsorption properties is known from U.S. Pat. No. 5,182,103.
The objective of this invention is the development of new cosmetic preparations which, in addition to their skin care effects, provide an increased inhibitive effect with regard to inflammation as well as providing a particularly pleasant sensation on the skin.
According to the invention, the cosmetic preparation containing kaolin consists of over 85% by weight, in particular over 95% by weight, modified with spherical inorganic particles with a particle size of less than 5 .mu.m in a proportion of 0.5 to 10 by weight of the kaolin mixture and group for lotions, creams and masks; gels and gel bases for lotions, creams and masks in which the proportion of the kaolin/spherical particle mixture, based on the overall composition, is in the range of over 2 to 65% by weight; and in which the viscosity of the overall composition including the proportion of kaolin/spherical particles remain under that of the same composition with kaolin but without spherical particles by 2000 to over 15,000 cps and in which the difference in viscosity increases with the proportion of kaolin/spherical particles.
A further characteristic of the invention is that the cosmetic preparations mentioned above provide a particularly pleasant sensation on the skin and have a non-sticky, non-plasticized consistency.
Kaolin mixtures with a proportion of spherical particles of 0.5 to 5% by weight are particularly favorable. In addition, it is advantageous if the size of the spherical particles is in the range of 0.1 to 3 .mu.m, especially in the range of 0.1 to 1 .mu.m.
The proportion of modified kaolin mixture (kaolin/spherical particles) is usable in the entire range from approx. 2 to approx. 65% by weight; it is particularly favorable if the proportion of the modified kaolin mixture lies in the range from 5 to 30% by weight, although still higher proportions are possible, especially in powders.
Surprisingly, not only can an improvement of the agglomeration within the kaolin suspension be achieved through the formulation of a kaolin mixture with a low proportion of spherical inorganic particles such as amorphous silicon dioxide, but the introduction of kaolin in cosmetic compositions such as emulsions becomes possible in such high proportions as would not have been expected by a specialist. The employed kaolin, with a platelet diameter in the range of 0.2 to 1 .mu.m, does not form a superordinate macrostructure with the roughly equally-sized SiO.sub.2 particles, thus avoiding the known condition of plasticity of clays and resulting in a lower viscous dispersion as opposed to the usual mixtures of kaolin and aqueous cosmetic additives, which lead to mixtures with signs of plasticity.
A further synergistic effect is the hitherto unachieved sensation of softness of the complete preparation on the skin; the cosmetic effect of comparable products is surpassed and a significant inhibitive effect with regard to inflammation is simultaneously achieved.
An additional surprising effect may be observed with gels, in that the addition of modi

REFERENCES:
patent: 5182103 (1993-01-01), Nakane et al.

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