| abstract |
PURPOSE: To provide a cement admixture capable of providing excellent fluidity without occurrence of hardening retardation, comprising a reaction product of a water-soluble prepolymer having a specific composition and a compound capable of reacting with the functional group of the prepolymer. n CONSTITUTION: (A) 1-99.9wt.% (poly)alkylene glycol mono(meth)acrylic acid ester-based monomer shown by formula I (R 1 is H or methyl; R 2 is 2-4C alkylene; R 3 is H or 1-5C alkyl; n is 1-100) is reacted with (B) 99-0.1wt.% (meth) acrylic acid-based monomer shown by formula II (R 4 is H or methyl; X is H, monovalent metal, bivalent metal, trivalent metal, etc.) to give a water-soluble prepolymer having a 500-100,000 molecular weight. Then, the prepolymer is reacted with a compound (e.g. acryl glycidyl ether) capable of reacting with the functional group of the prepolymer in the ratio of functional group of 0.1-100mol % based on the functional group of the prepolymer. Then the prepared hydrophilic resin is used as a main component to produce a cement admixture. n COPYRIGHT: (C)1991,JPO&Japio |