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Use as thickeners in cosmetics of neutralized copolymers comprising weak acid units and strong acid units, and cosmetic compositions comprising same
Use as thickeners in cosmetics of neutralized copolymers comprising weak acid units and strong acid units, and cosmetic compositions comprising same
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机译:包含弱酸单元和强酸单元的中和共聚物在化妆品中的增稠剂,以及包含该增稠剂的化妆品组合物
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摘要
This invention relates to a cosmetic, dermatologic, pharmaceutical, or veterinary composition comprising at least one thickening and/or emulsifying polymer for an aqueous medium, such composition being obtained by polymerization: at least one unsaturated weak acid and at least one unsaturated strong acid such as AMPS, in the presence of a cross-linking or branching agent and optionally of a transfer agent and characterized by ;a water-soluble polymer fraction ranging from 5 to 50 percent by weight, preferably 8 to 35 percent. ;These acids are partially neutralized at the time of polymerization. ;The composition obtained surprisingly exhibits optimal cosmetic characteristics, in particular very high stability in the presence of electrolytes over a very wide pH range (1-13) as a result of selection of suitable polymerization conditions for the thickening and/or emulsifying polymer (neutralization rate, active matter concentration, strong/weak acid molar ratio).
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