Patent ID: 6843845

Claim:
A hydraulic composition admixture, comprising (A) a nonionic water-soluble hydroxyethyl cellulose and/or nonionic water-soluble hydroxyethyl ethyl cellulose having a viscosity of at least 500 mPa·s as measured in a 1 wt % aqueous solution at 20° C. by a Brookfield viscometer at 12 rpm, and (B) at least one cellulose ether selected from the group consisting of nonionic water-soluble alkyl celluloses, nonionic water-soluble hydroxyalkyl celluloses other than the hydroxyethyl cellulose, and nonionic water-soluble hydroxyalkyl alkyl celluloses other than the hydroxyethyl ethyl cellulose, having a viscosity of at least 1,500 mPa·s as measured in a 1 wt % aqueous solution at 20° C. by a Brookfield viscometer at 12 rpm wherein the hydroxyethyl cellulose and/or hydroxyethyl ethyl cellulose (A) and the other nonionic water-soluble cellulose ether (B) are present in a weight ratio from 95:5 to 50:50.