Method for thickening a cosmetic formulation using an alkali swellable emulsion of a polymer with amps and which is rich in acrylic acid
AssigneeCoatex
InventorsRenaud Souzy, Jean-Marc Suau, Yves Kensicher, Olivier Guerret
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Abstract
Process for thickening a composition, through the use of a direct emulsion in water, which is alkali-swellable, of a polymer of the ASE or HASE type, which is both rich in acrylic acid and which has a certain quantity of AMPS. The use of such emulsions simultaneously allows there to be no obligation to use surfactants and organic solvents other than water, and allows the thickening phenomenon to be activated for pHs of less than 7: this latter characteristic is particularly advantageous for formulations intended to be used in contact with skin.
Claims20
A method for thickening a formulation, the method comprising:
- contacting the formulation with a direct aqueous emulsion of a polymer, followed by
- regulating a pH of the formulation to a value between 5 and 7, thereby forming a thickened formulation,
- wherein the emulsion is free from surfactants and organic solvents other than water and
- the polymer consists, expressed as a content by weight of monomers therein, of:
- a) from 20% to 60% by weight of acrylic acid and, optionally, methacrylic acid, wherein a content by weight of acrylic acid compared to a total weight of acrylic and methacrylic acid is at least 50%,
- b) from 40% to 80% by weight of ethyl acrylate, butyl acrylate, methyl methacrylate, or any combination thereof,
- c) from 0.05% to 22% by weight of 2-acrylamido-2-methylpropane sulfonic acid, and
- d) from 0 to 1% by weight of at least one cross-linked monomer.
Dependencies are inferred from the claim text.