Grafted acrylic polymers for use in hydraulic cement compositions as liquefying and-or water reducing agent, optionally comprise alkyl esters of acrylic or methacrylic acids and acid groups esterified with polyethylene glycol monoether

摘要

Grafted acrylic polymer contains: (A) 91-99.4 mol.% of ethylenically unsaturated carboxylic acid (or its salt) derivative, (B) 0.1-4 mol.% of pentaerythritol tetrakis mercapto- propionate (B1) or -acetate (B2) derivative, and (C) 0.5-5 mol.% of alkyl ester of ethylenically unsaturated carboxylic acid derivative (optionally), with (D) 30-60% of carboxylic acid groups esterified with polyethylene glycol monoether. Independent claims are also included for (1) aqueous solution of acrylic polymer as claimed; (2) use of acrylic polymer as claimed or its aqueous solution as claimed as high efficiency liquefying and/or water reducing agent in compositions based on hydraulic cement