Patent ID: 9624130
Date: 2017-04-18
CPC Classifications: C04B

Claim:
1. A method for modifying a cementitious composition, comprising introducing into a hydratable cementitious composition three different carboxylate polymers, identified herein as Polymer I, Polymer II, and Polymer III, each of said polymers being obtained from Components A, B, and C, wherein: Component A is an unsaturated carboxylic acid monomer represented by structural formula 1, Component B is a polyoxyalkylene monomer represented by structural formula 2: Component C is an unsaturated carboxylate ester or amide monomer represented by structural formula 3: wherein R Y represents —(CH Z represents —O—, —COO—, —OCO—, —COHN—, or —NHCO—; -(AO) “n” represents the average number of repeating -(AO) groups and is an integer of from 10 to 250; W represents an oxygen atom or an —NH— group, and R wherein, in Polymer I, the Components A, B, and C are present in a molar ratio (A:B:C) in the range of 2:1:0 to 5:1:0; and further wherein, in Polymer II, the Components A, B, and C are present in a molar ratio (A:B:C) in the range of 0.1:1:0 to 2:1:0; and and further wherein, in Polymer III, the molar ratio of Component A to the sum of Components B and C is in the range (A:B+C) of 0.3:1 to 3:1.