Patent ID: 8821630

Claim:
A cementitious composition, comprising: a hydratable cementitious binder and a carboxylated-carboxylic polyglycerol polymer having a number average molecular weight of 800 to 20,000, the carboxylated-carboxylic polyglycerol polymer being formed by (a) providing mono-glycerols having hydroxide groups capable of forming ether linkages; (b) forming ether linkages from and between some of said mono-glycerol hydroxide groups, to obtain polyglycerol homopolymers; (c) carboxylating said obtained polyglycerol homopolymers with at least one or both of the following polycarboxylic acid compounds represented by the following structures or R 1 O(O)C—Y—C(O)OR 2 wherein X and Y each independently represent C 1 -C 10 saturated or unsaturated aliphatic or aromatic groups, said groups optionally containing a nitrogen atom or one or more carboxylic or sulfonic groups; and R 1 and R 2 each independently represent hydrogen or C 1 -C 3 alkyl groups.