Patent ID: 6093764
Filing Date: 2000-07-25
Classification: C01P,C08F,C08K,C09C

Abstract:
A method of dispersing mineral substances in aqueous media, comprising combining: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,(b) optionally, at least one ethylenically unsaturated monomer having at least one sulphonic function and/or phosphoric function,(c) optionally, at least one ethylenically unsaturated monomer having no carboxyl function, 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 which is acrylurethane methacrylurethane .alpha.,.alpha.' dimethyl-m-isopropenyl-benzylurethane or allylurethane,R' is a tristyrylphenyl group or a linear or branched alkyl, alkylaryl, 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.