Patent ID: 6706679
Filing Date: 2004-03-16
Classification: A61K,A61Q,C11D,H04N

Abstract:
A method of conserving foams generated be a foam forming formulation, comprising the step of adding to said formulation, an effective foam conserving amount of a copolymer or a mixture of copolymers comprising:at least one monomer (I) which is a C3-C5 unsaturated acid, a diacid or an anhydride, at least one monomer (II) which is ethylene oxide or propylene oxide, at least one monomer (III) which is a linear or branched C4-C8 hydrocarbon comprising at least one ethylenic unsaturation, at least one monomer (IV) which is vinyl acetate; alkyl acrklate; alkyl methacrylate; alkyl methacrylate or acrylate bearing a sulfoalkyl group, in the form of an acid or of an alkali metal salt or ammonium salt of formula: â€”N(R3)3+, wherein R3, which are identical or different, represent a hydrogen atom or C1-C4 hydrocarbon radical, optionally substituted with a hydroxyl group; hydroxyalkyl acrylate; or hydroxyalkyl methacrylate, said alkyl radical being methyl, ethyl, propyl, prropyl isomer, butyl, or butyl isomer,said copolmer comprising at least one monomer (I) and at least one monomer (IV), and having the following composition: 1-15% of monomer (I); 50-85% of vinyl acetate; 5-20% of alkyl acrylate or methacrylate; 0.5-5% of sodium sulfoalkyl acrylate or methacrylate; and the sum of each of the monomers used being equal to 100% relative to the weight of the copolymer.