Cosmetic formulation containing a non water-soluble amphiphilic copolymer as thickening agent
AssigneeCoatex
InventorsRenaud Souzy, Jean-Marc Suau, Yves Kensicher, Olivier Guerret
Life of this patent
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Abstract
The present invention concerns formulations containing one or more comb structure amphiphilic copolymers that are both rich in hydrophobic monomers and in polyalkylene glycol monomers. Cosmetic formulations. Methods of thickening.
Claims14
A formulation comprising an aqueous phase, a non-aqueous phase, and an amphiphilic non-water-soluble comb copolymer, wherein said amphiphilic non-water-soluble comb copolymer consists of, as expressed in % by weight of each of its comonomers:
- a) from 30% to 60% of at least one hydroxy and/or methoxy polyalkylene glycol monomer with the formula R-(EO)m-(PO)n-R′, with:
- m and n designating integers that are less than or equal to 150, with at least one of them being non-zero,
- EO and PO respectively designating ethylene oxide and propylene oxide,
- R designating the methacrylate or methacrylurethane function,
- R′ designating a hydroxy or methoxy, group,
- b) from 20% to 60% of at least one hydrophobic monomer chosen from styrene and paratertiobutylstyrene, and the (meth)acrylic esters with 1 to 4 carbon atoms on the ester group,
- c) from 0.1% to 10% of at least one monomer which is acrylic and/or methacrylic acid,
- d) from 0 to 15% of an associative monomer with the formula R-(EO)m-(PO)n-R′, with:
- m and n designating integers that are less than or equal to 150, with at least one of them being non-zero,
- EO and PO respectively designating ethylene oxide and propylene oxide,
- R designating a polymerizable function, preferentially the methacrylate or methacrylurethane function,
- R′ designating an alkyl or aryl or alkylaryl group with 8 to 36 carbon atoms, linear or branched,
- e) from 0 to 5% of a monomer with at least two ethylenic unsaturations,
- and wherein the sum of the percentages a), b), c), d) and e) being equal to 100%.
A process for thickening a formulation, comprising introducing a thickening amount of an amphiphilic non-water soluble comb copolymer into said formulation, wherein said amphiphilic non-water-soluble comb copolymer consists of, as expressed in % by weight of each of its comonomers:
- f) from 30% to 60% of at least one hydroxy and/or methoxy polyalkylene glycol monomer with the formula R-(EO)m-(PO)n-R′, with:
- m and n designating integers that are less than or equal to 150, with at least one of them being non-zero,
- EO and PO respectively designating ethylene oxide and propylene oxide,
- R designating the methacrylate or methacrylurethane function,
- R′ designating a hydroxy or methoxy, group,
- g) from 20% to 60% of at least one hydrophobic monomer chosen from styrene and paratertiobutylstyrene, and the (meth)acrylic esters with 1 to 4 carbon atoms on the ester group,
- h) from 0.1% to 10% of at least one monomer which is acrylic and/or methacrylic acid,
- i) from 0 to 15% of an associative monomer with the formula R-(EO)m-(PO)n-R′, with:
- m and n designating integers that are less than or equal to 150, with at least one of them being non-zero,
- EO and PO respectively designating ethylene oxide and propylene oxide,
- R designating a polymerizable function, preferentially the methacrylate or methacrylurethane function,
- R′ designating an alkyl or aryl or alkylaryl group with 8 to 36 carbon atoms, linear or branched,
- j) from 0 to 5% of a monomer with at least two ethylenic unsaturations,
- and wherein the sum of the percentages a), b), c), d) and e) being equal to 100%.
The process according to claim 13, wherein said formulation has a pH less than or equal to 7.
Dependencies are inferred from the claim text.