Patent ID: 6384111
Filing Date: 2002-05-07
Classification: C04B,C08F

Abstract:
A mineral building material, comprising:as an additive at least one water-soluble or water-dispersible polymer containing a carboxyl group, and a side chain of the formula 1: â€”Xâ€”Yâ€”O&Parenopenst;Alk-O)nâ€”Râ€ƒâ€ƒ(I) â€ƒwherein Y is a C1-C4-alkylene unit; X is â€ƒor Y is a single bond and X is a carbonyl group; wherein Râ€² is hydrogen; Alk is C2-C4-alkylene; n is a number from 15 to 60; R is hydrogen or C1-C20-alkyl; wherein said water-soluble or water-dispersible polymer is obtained by free-radical copolymerization of methacrylic acid as monomer A and an ethylenically unsaturated monomer B having said side chain of the formula I and, optionally, a monomer C; wherein said polymerization is carried out in the presence of at least one polymerization initiator and from 1 to 10% by weight of a phosphorus-containing compound based on a total weight of the monomers; wherein said phosphorus-containing compound is selected from the group consisting of phosphinic acid, phosphonic acid and salts thereof; wherein a weight ratio of said monomer A to said monomer B is from 1:9 to 4:6; and wherein the monomer B is selected from the group consisting of a) an ester of a monoethylenically unsaturated C3-C6-monocarboxylic acid with an alcohol of formula II: â€ƒH&Parenopenst;O&Parenclosest;pâ€”Yâ€”O&Parenopenst;Alk-O&Parenclosest;nâ€”Râ€ƒâ€ƒ(II)wherein Y, Alk, n and R are as defined above, p=0 if Y is a single bond and p=1 if Y is C1-C4-alkylene, and b) an amide of a monoethylenically unsaturated C3-C6-monocarboxylic acid with an amine of the formulae III or IlIa: H2N-Alkâ€²-O&Parenopenst;Alk-O)nâ€”Râ€ƒâ€ƒ(III) H2N&Parenopenst;Alk-O&Parenclosest;nâ€”Râ€ƒâ€ƒ(Illa) â€ƒwherein Alkâ€² is C1-C4-alkylene and Alk, n and R are as defined above.