Drug – bio-affecting and body treating compositions – Preparations characterized by special physical form – Cosmetic – antiperspirant – dentifrice
Patent
1998-10-27
2000-09-19
Venkat, Jyothsan
Drug, bio-affecting and body treating compositions
Preparations characterized by special physical form
Cosmetic, antiperspirant, dentifrice
424 59, 424 61, 424 701, 424 705, 424 707, 514844, 514845, 514937, 514944, A61K 748
Patent
active
061207802
DESCRIPTION:
BRIEF SUMMARY
This application is 371 of PCT/FR97/01098 filed Jun. 18, 1997.
The present application relates to the use, as a cosmetic product, of crosslinked, at least 90% neutralized, poly(2-acrylamido-2-methylpropanesulphonic acid) polymers and to cosmetic or dermatological compositions containing them.
Cosmetic or dermatological compositions generally have a high viscosity and are mostly formulated in a thickened liquid form such as a milk, a cream, a gel or a paste. This type of presentation is greatly favoured by consumers; it is usually an issue which is a practical preoccupation for the formulator: facilitating the removal of the product from its packaging without any significant loss, limiting the diffusion of the product to the local area of treatment and being able to use it in sufficient amounts to obtain the desired cosmetic or dermatological effect.
This objective is important for formulations such as those of make-up, hygiene or care products which should spread well, homogeneously over the local surface to be treated, as well as hair compositions, which should spread well and distribute themselves uniformly along the keratin fibres and should not run down the forehead, the nape of the neck or the face or into the eyes.
In order to satisfy these conditions, the viscosity of the compositions is increased by adding thickening and/or gelling polymers.
Poly(2-acrylamido-2-methylpropanesulphonic acid) homopolymers such as the commercial products Cosmedia HSP1160 and Rheotik 8011 from the company Henkel are known in the prior art. They are used as thickeners and/or gelling agents in many cosmetic formulations. These polymers do not make it possible to obtain stable and homogeneous compositions which can reach high viscosities over a wide pH range. They usually lead to heterogeneous, stringy and sticky fluid gels.
The applicant has discovered, surprisingly, a novel family of thickening and/or gelling polymers which makes it possible to obtain a very large number of cosmetic and dermatological formulations which may contain supports of different nature.
The subject of the invention is the use, as cosmetic products, of crosslinked and at least 90% neutralized poly(2-acrylamido-2-methylpropanesulphonic acid) polymers which will be defined in greater detail in the rest of the description.
The invention relates, in particular, to their use as thickeners and/or gelling agents in cosmetic and/or dermatological compositions.
These polymers make it possible in particular to prepare many aqueous compositions, over a wide pH range, the viscosity of which remains stable over time at room temperature or at higher temperatures.
They also make it possible to produce transparent, homogeneous, non-runny, non-stringy aqueous gels which are soft and slippery when applied and stable on storage.
The crosslinked and totally or almost totally neutralized poly(2-acrylamido-2-methylpropanesulphonic acid) polymers in accordance with the invention are water-soluble or swellable in water. They are generally characterized in that they comprise, distributed randomly: ##STR2## in which X.sup.+ denotes a cation or a mixture of cations, not more than 10 mol % of the cations X.sup.+ being able to be protons H.sup.+ ; one monomer having at least two olefinic double bonds; the weight proportions being defined relative to the total weight of the polymer.
Preferably, the polymers of the invention contain a number of units of formula (1) in an amount which is sufficiently high to obtain polymer particles whose hydrodynamic volume in solution in water has a radius ranging from 10 to 500 nm and whose distribution is homogeneous and unimodal.
The polymers according to the invention more particularly preferred comprise from 98 to 99.5% by weight of units of formula (1) and from 0.2 to 2% by weight of crosslinking units.
X.sup.+ represents a cation or a mixture of cations chosen in particular from a proton, an alkali metal cation, a cation equivalent to that of an alkaline-earth metal or the ammonium ion.
More particularly, 90 to 100 mol % of the cations
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Dupuis Christine
Hansenne Isabelle
Lorant Raluca
Maubru Mireille
Sebillotte-Arnaud Laurence
"L'Oreal"
Venkat Jyothsan
LandOfFree
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