Patent ID: 6589539
Filing Date: 2003-07-08
Classification: A61K,A61Q

Abstract:
A process of preparing cosmetic and/or dermatological compositions, which comprise at least one amphoteric copolymer that is crosslinked and/or branched, wherein said process comprises the copolymerization of a mixture, which comprises:1) at least one monomer selected from the monomers of formulae (Ia) and (Ib): wherein R1 and R2, which are identical or different, are each selected from a hydrogen atom and a methyl radical; R3, R4, and R5, which are identical or different, are each selected from linear and branched alkyl radicals having from 1 to 30 carbon atoms; Z is selected from an NH group and an oxygen atom; n is an integer ranging from 2 to 5; and Aâˆ’ is an anion selected from anions derived from organic and inorganic acids;2) from 25 mol % to 75 mol % of at least one monomer of formula (II): wherein R6 and R7, which are identical or different, are each selected from a hydrogen atom and a methyl radical; and Z1 is selected from an OH group and a NHC(CH3)2CH2SO3H group;3) at least one monomer of formula (III): wherein R6 and R7, which are identical or different, are each selected from a hydrogen atom and a methyl radical; X is selected from an oxygen atom and a nitrogen atom; and R8 is selected from linear and branched alkyl radicals having from 1 to 30 carbon atoms; and4) at least one agent selected from crosslinking and branching agents; wherein at least one of the monomers of formulae (Ia), (Ib), and (III) comprises at least one fatty chain having from 8 to 30 carbon atoms; and wherein said monomers of formulae (Ia), (Ib), (I), and (III) may be quaternized.