Patent ID: 6730764
Filing Date: 2004-05-04
Classification: C04B,Y10T

Abstract:
A concrete retarder having the ability to retard a set of concrete upon contact with unset concrete comprising, three components (i), (ii) and (iii), wherein component(i) is a main component and is an adhesive component comprising a polymer (A), wherein the polymer (A) comprises a hydrophobic component with a low glass transition temperature (Tg) not higher than âˆ’5Â° C. as a structural unit, and a surface tension of not higher than 35 mN/m, and wherein said hydrophobic component comprises at least one member selected from the group consisting of an acrylic acid C6-12alkyl ester and a methacrylic acid C6-14alkyl ester; component (ii) is a concrete set retardative component having or generating a carboxyl group selected from a group consisting of (meth)acrylic acid; polycarboxylic acid or esters and anhydrides thereof; and polyesters; and component (iii) comprises a hydrophilic group including hydroxyl groups and (poly)oxyalkylene groups introduced by polymerization.