Patent ID: 6139623
Filing Date: 2000-10-31
Classification: C04B,C08J

Abstract:
An emulsion admixture composition for hydraulic cement compositions, comprising:(a) a comb polymer operative as a plasticizer in hydratable cementitious compositions, said comb polymer having a carbon-containing backbone to which are attached pendant cement-anchoring members and oxyalkylene members, said oxyalkylene members comprising ethylene oxide groups, propylene oxide groups, or a mixture thereof, said comb polymer being in the amount of 80-98.9 dry wt. % dry based on solids content of the emulsion admixture;(b) an antifoaming agent emulsified with said comb polymer, said antifoaming agent in the amount of 1-15 dry wt. % based on solids content of the emulsion admixture, said antifoaming agent being selected from the group consisting of (i) a phosphate ester having the formula P(O)(O--R).sub.3 wherein P represents phosphorus, O represents oxygen, and R represents a C.sub.2 -C.sub.20 alkyl group; (ii) a borate ester; and (iii) and a polyoxyalkylene copolymer having defoaming properties;(c) at least one surfactant in the amount of 0.05-10.0 dry wt. % based on solids content of the emulsion admixture, said at least one surfactant operative to stabilize said emulsion mixture, said surfactant comprising (i) an esterified fatty acid ester of a carbohydrate selected from the group consisting of a sugar, sorbitan, a disaccharide, and a polysaccharide; (ii) a C.sub.2 -C.sub.20 alcohol having polyoxyalkylene groups; or (iii) a mixture thereof; and(d) water in the amount of 40 90 wt. % of the emulsion admixture.