Patent ID: 7390855

Claim:
A process for manufacturing a concrete admixture additive, comprising the steps of: (a) preparing a first reagent containing 1-75% by weight of a polymer having the formula: wherein R 11 is hydrogen or methyl; R 12 is hydrogen or methyl; X′ is selected from the group consisting of C 6 -C 10 aromatic group, C 6 -C 10 sulfonated aromatic group, C 5 -C 6 cyclic aromatic group, and C 1-10 alkoxy group; Y′ is selected from the group consisting of C 2 -C 5 saturated aliphatic group, C 2 -C 5 unsaturated aliphatic group, wherein R 15 and R 16 are respectively selected from the group consisting of hydrogen, halogen, C 1-10 alkyl group, C 6-10 aromatic group, C 6-10 fluoroaromatic group, C 1-10 alkoxy group, C 2-10 alkenyl group, C 7-11 aromatic alkyl group, C 8-12 aromatic alkenyl group and C 7-11 alkyl aromatic group; r is an integer from 0 to 25; s is an integer from 0 to 25; and t is an integer from 0 to 50; provided at least two of r, s and t are not zero; (b) reacting the first reagent with a second reagent at a temperature between 20 and 180° C., wherein the second reagent contains 1-75% by weight of at least one oxyalkene or polyoxyalkene having the formula H 2 N(Z′O) q R 18 or HO(Z′O) q R 18 , wherein Z′ is a C 2 -C 5 aliphatic group; q is an integer from 5 and 100; and R 18 is a C 1 -C 5 aliphatic group or C 6 -C 10 aromatic group; (c) reacting the resultant mixture of (b) with an acidic reagent to form a carboxylated polymeric product, wherein the acidic reagent contains 1-10% by weight of an inorganic acid or sulfuric organic acid; and (d) treating the carboxylated polymeric product with an alkaline reagent, wherein the alkaline reagent contains 1-10% by weight of a compound having the formula M(OR 19 ) v , wherein M is an alkaline metal cation, alkaline earth metal cation, or ammonium; v is the valence of M; and R 19 is selected from the group consisting of hydrogen, C 1-10 alkyl group, C 6-10 aromatic group, C 1-10 alkoxy group, C 7-11 aromatic alkyl group, C 8-12 aromatic alkenyl group and C 7-11 alkyl aromatic group.