Patent ID: 8177905
Filing Date: 2012-05-15
Classification: C04B,C08K

Abstract:
1. A method of imparting flow to a cementitious composition, comprising the addition thereto of an admixture comprising: (1) 2-phosphonobutane-1,2,4-tricarboxylic acid; (2) optionally, citric acid or citric acid monohydrate; and (3) at least one polymer derived from ethylenically-unsaturated mono- or dicarboxylic acids, and characterised in that the polymer comprises: a) 51-95 mole % of moieties of formula 1a and/or 1b and/or 1c wherein b) 1-48.9 mole % of moieties of the general formula II wherein c) 0.1-5 mole % of moieties of Formulae IIIa or IIIb wherein wherein d) 0-47.9 mole % of moieties of the general formula IVa and/or IV b: wherein a, M, X and Y have the meanings defined above.