Patent ID: 6057398
Filing Date: 2000-05-02
Classification: C08F,D21H

Abstract:
An aqueous suspension, comprising:water,at least one mineral substance, anda copolymer which comprises the following monomers in polymerized form:(a) at least one ethylenically unsaturated monomer having at least one carboxyl function, selected from the group consisting of acrylic acid, methacrylic acid, crotonic acids, isocrotonic acid, cinnamic acid, itaconic acid, fumaric acid, maleic acid, citraconic acid, maleic anhydride, the C.sub.1 to C.sub.4 monoesters of maleic acid, and the C.sub.1 to C.sub.4 monoesters of itaconic acid,(b) optionally, at least one ethylenically unsaturated monomer having at least one sulphonic function and/or phosphoric function, selected from the group consisting of acrylamido-methyl propane-sulphonic acid, sodium methallylsulphonate, vinyl sulphonic acids, the styrene sulphonic acids, ethylene glycol methacrylate phosphate, propylene glycol methacrylate phosphate, ethylene glycol acrylate phosphate, propylene glycol acrylate phosphate and their ethoxylates,(c) optionally, at least one ethylenically unsaturated monomer having no carboxyl function, selected from the group consisting of the esters of acrylic or methacrylic acids, acrylonitrile, methacrylonitrile, vinyl acetate, styrene, methylstyrene, diisobutylene, vinylpyrrolidone, vinylcaprolactam, unsaturated amides, the acrylic or methacrylic esters of glycol, methacrylamido-propyl-trimethyl-ammonium chloride or sulphate, the methacrylate of trimethyl-ammonium-ethyl chloride or sulphate and their acrylate and quarternized acrylamide counterparts, and dimethyldiallylammonium chloride, and(d) at least one ethylenically unsaturated oxyalkylated monomer terminating with a hydrophobic chain represented by the general formula (I): ##STR4## wherein m is at most 100,p is at most 100,n is at most 100,q is a number at least equal to 1 and such that 0.ltoreq.q (n+m+p).ltoreq.100.R.sub.1 is hydrogen or a methyl or ethyl radical,R.sub.2 is hydrogen or a methyl or ethyl radical,R is a polymerizable unsaturated radical derived from an acrylic, methacrylic, maleic, itaconic, crotonic, or vinylphthalic ester or an unsaturated urethane, wherein the unsaturated urethane is acrylurethane, methacrylurethane, .alpha.,.alpha.'dimethyl-m-isopropenyl-benzylurethane or allylurethane.R' is a hydrophobic radical, selected from the group consisting of a tristyrylphenyl group or a linear or branched alkyl, alkylalkyl, arylalkyl, aryl group having at least 8 carbon atoms, a dialkyl amine having at least 8 carbon atoms when R represents the unsaturated urethane, or R' is a tristyrylphenyl radical, a linear or branched alkyl alkylaryl, arylalkyl, aryl group having more than 30 carbon atoms or a dialkylamine having more than 22 carbon atoms when R represents polymerizable unsaturated radical derived from an acrylic, methacrylic, maleic, itaconic, crotonic, or vinylphthalic ester.wherein the sum of the weight percent of (a), (b), (c) and (d) in the copolymer is 100%, andthe copolymer has a specific viscosity of at most 50.