Thickener for cosmetic composition
AssigneeCrosfield Limited
InventorsPamela E. Baines, Peter W. Stanier
Life of this patent
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Abstract
A thickening system containing an amorphous silica and xanthan gum in a silica/xanthan gum weight ratio from 160:1 to 2:1, preferably 100:1 to 5:1, most preferably 30:1 to 6.5:1 can be used to stabilise and thicken cosmetic compositions containing alpha-hydroxy carboxylic acids.
Claims12
Cosmetic composition comprising:
- I) from about 0.01 to 20% by weight of at least one member of the group consisting of C.sub.1 -C.sub.25 alpha-hydroxy carboxylic acids and their salts and mixtures thereof;
- ii) from about 0.05 to 0.5% by weight of than gum;
- iii) from about 0.5 to 8% by weight of an amorphous silica;
- iv) a cosmetically acceptable carrier,
- v) wherein the amorphous silica and xantham gum are present in a silica/xanthan gum weight ration from 160:1 to 2:1.
Cosmetic composition comprising:
- i) from about 0.01 to 20% by weight of at least one member of the group consisting of C.sub.1 -C.sub.25 alpha-hydroxy carboxlylic acids and their salts and mixtures thereof;
- ii) from about 0.05 to 0.5% by weight of xanthan gum;
- iii) from about 0.5 to 8% by weight of an amorphous silica;
- iv) a cosmetically acceptable carrier
- wherein the amorphous silica comprises an amorphous silica having a pore size distribution wherein 90% of the pores have a diameter above 15 nanometers, and less than 20% of the pore volume is in pores having a pore diameter between 10 and 30 nanometers, the amorphous silica having a CTAB surface area of less than 100 m.sup.2 /g.
A thickened cosmetic composition comprising:
- i) from about 0.01 to 20% by weight of at least one member of the group consisting of C.sub.1 -C.sub.25 alpha-hydroxy carboxylic acids and their salts and mixtures thereof;
- ii) from about 0.05 to 0.15% by weight of xanthan gum;
- iii) from about 0.5 to 80% by weight of an amorphous silica;
- iv) a cosmetically acceptable carrier, said composition having a pH within the range of 3 to 5.
In a thickened cosmetic composition comprising from about 0.01 to 20% by weight of at least one member of the group consisting of C.sub.1 -C.sub.25 alpha hydroxy carboxylic acids, salts thereof and mixtures thereof, together with a thickener and a cosmetically acceptable carrier, the improvement wherein the thickener comprises the combination of from about 0.05 to 0.5% by weight of xanthum gum and from about 0.5 to 8% by weight of an amorphous silica, based on the composition weight:
- wherein the amorphous silica and xanthan gum are present in a silica/xanthan gum weight ration from 160:1 to 2:1:
- the composition being characterized by its storage stability at 45.degree. C. and freedom from syneresis.
Dependencies are inferred from the claim text.