ADMIXTURE FOR HYDRAULIC MATERIAL

Japanese Patent JP3877831

B2

PROBLEM TO BE SOLVED: To reduce slump loss and to improve the hardening characteristics, water-reducing property, etc., of a hydraulic material by copolymerizing a monomer having a polymerizable C-C double bond with an acrylic acid monomer.
SOLUTION: This admixture is made of a copolymer having a mol.wt. of 500-500,000 obtd. by bringing 0.5-30 wt.% monomer of formula I [where R1 is H or methyl, R2 is ethylene or carbonyl, R3 is hydrocarbon, R4 is hydrocarbon or acyl, X is H, hydrocarbon or a hydrophilic group and (n) is 0 or ≥1] and 1-80 wt.% monomer or formula II (where R5 is H or methyl and M1 is H, a metallic atom or ammonium) into reaction at room temp. to 150°C under atmospheric pressure to 5 kg/cm2 pressure for 1-10 hr. At this time, 1-80 wt.% monomer of formula III [where R6 is H or methyl, R7 is hydrocarbon, R8 is H or hydrocarbon and (m) is 0 or ≥1] and 5-30 wt.% monomer of formula IV [where each of R9 and R10 is H or methyl and each of M2 and M3 is H, a metallic atom, ammonium or a group of the formula -(R11-O)p-R12 (where R11 is hydrocarbon, R12 is H or hydrocarbon and (p) is 0 or ≥1)] are allowed to take part in the reaction.

Yutaka Nakahara
Naminami justice
Yuji Hagiwara
Horinouchi Masatoshi

JP8667497A

February 07, 2007

April 04, 1997

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ADEKA CORPORATION

C04B24/26; C08F220/06; C08F290/06; C04B103/32; (IPC1-7): C04B24/26; C08F220/06; C08F290/06; //C04B103:32

JP8041112A
JP58074552A
JP7053249A
JP7267705A
JP7215746A
JP9040446A
JP10120712A

Michiteru Soga
Yoshio Kobayashi
Yutaka Ikeya
Hidetoshi Furukawa
Suzuki Kenchi
Masahisa Hase
Tetsuo Kuroiwa

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