Patent Number: 6,166,112

Title: Cement admixture and cement composition

Abstract: The invention provides: a cement admixture which has excellent cement dispersibility and can afford high slump retainability; and a cement composition which has excellent cement dispersibility and high slump retainability. The cement admixture comprises a polycarboxylic acid as an effective component, wherein the polycarboxylic acid is obtained by a process including the steps of: charging "a" parts by weight of a polyalkylene glycol (A) and "b" parts by weight of a (meth)acrylic acid monomer (B) into a reactor in the range of {(a/n.sup.1/2)/b}.times.100.ltoreq.200, wherein n is an average molar number of the added oxyalkylene groups in the polyalkylene glycol (A) and is a number of 1 to 300; carrying out an esterification reaction of the resultant mixture in the reactor, thus obtaining a polyalkylene glycol (meth)acrylate (C); and copolymerizing the resultant polyalkylene glycol (meth)acrylate (C) and the (meth)acrylic acid monomer (B), thus obtaining the polycarboxylic acid.

Inventors: Hirata; Tsuyoshi (Kobe, JP), Yuasa; Tsutomu (Osaka, JP), Nagare; Koichiro (Suita, JP)

Assignee: Nippon Shokubai Co., Ltd.

International Classification: C04B 24/32 (20060101); C04B 24/26 (20060101); C04B 24/00 (20060101); C08G 65/332 (20060101); C08G 65/00 (20060101); C08F 222/10 (20060101); C08F 290/14 (20060101); C08F 222/00 (20060101); C08F 290/00 (20060101); C08F 220/06 (20060101); C08F 220/00 (20060101); C08L 71/00 (20060101); C08F 290/06 (20060101); C08L 71/02 (20060101); C08K 003/00 ()

Expiration Date: 12/26/2017