Patent ID: 7265191

Claim:
A multi-functional admixture for hydraulic cement compositions, said admixture comprising one or more selected from the group consisting of specified reaction mixtures obtained by Process 1 and Process 2 and partially or completely neutralized substances obtained by said Process 1, said Process 2 and further Process 3 wherein said Process 1 is a process of initiating a radical copolymerization process of a radical polymerizable monomer mixture containing maleic anhydride and a monomer shown by Formula 1 by 97 molar % or more at a molar ratio of 50/50-70/30 in a non-aqueous system in the presence of a non-aqueous radical initiator, said Process 2 is a process of stopping the radical copolymerization reaction initiated in said Process 1 in the midst of the reaction while the inversion rate of polymerization defined by {(TM−UM)/TM}×100 becomes 50-90% by adding water to the reaction system and thereby obtaining a reaction mixture containing a copolymer thus produced and residual monomers, TM indicating the total weight of the radical polymerizable monomer mixture at the start of the radical polymerization reaction in said Process 1 and UM indicating the total weight of the residual monomers when the radical copolymerization reaction is stopped in said Process 2, said Process 3 is a process of partially or completely neutralizing the reaction mixture obtained in said Process 2 by one or two selected from the group consisting of alkali metal hydroxides, alkali earth metal hydroxides and amines, and said Formula 1 is given by CH 2 ═CH—CH 2 —O-A-O—R where R is methyl group, acetyl group or hydrogen atom and A is a residual group obtained by removing all hydroxyl groups from (poly)alkyleneglycol having (poly)oxyalkylene groups formed with 1-150 oxyethylene units or a total of 2-150 oxyethylene and oxypropylene units.