Patent ID: 6486260
Filing Date: 2002-11-26
Classification: C04B,C08F

Abstract:
A composition for using as a cement additive, which comprises, as a main component, a polycarboxylic acid polymer (X) which has;a repeating unit (A) represented by the general formula (1); wherein R1 and R2 are the same or different and each represents a hydrogen atom or a univalent hydrocarbon group containing 1 to 30 carbon atoms and optionally R1 and R2 together are a divalent hydrocarbon group; R3 represents a hydrogen atom, a phenyl group, an alkylphenyl group, a sulfonated phenyl group, an alkyl group containing 1 to 30 carbon atoms, an alkenyl group containing 2 to 30 carbon atoms, or a univalent organic group selected from the group consisting of â€”OR4, â€”OCOR5, â€”X1OR6, â€”O(R7O)aR8 and â€”CN; R4 and R5 each represents a univalent hydrocarbon group containing 1 to 30 carbon atoms; X1 represents a bivalent hydrocarbon group containing 1 to 3 carbon atoms; R6 and R8 each represents a hydrogen atom or a univalent hydrocarbon group containing 1 to 30 carbon atoms; R7 represents an alkylene group containing 2 to 30 carbon atoms; a represents the average number of oxyalkylene groups and is a positive number of 1 to 300; and S1 represents the mole ratio of the repeating unit in the polycarboxylic acid polymer (X),a repeating unit (B) represented by the general formula (2); wherein M1 and M2 are the same or different and each represents a hydrogen atom, a metal atom, an ammonium group or a protonated organic amine; and T1 represents the mole ratio of the repeating unit in the polycarboxylic acid polymer (X),a repeating unit (C) represented by the general formula (3); wherein M3 represents a hydrogen atom, a metal atom, an ammonium group or a protonated organic amine; R9 represents a univalent hydrocarbon group containing 1 to 30 carbon atoms; the RX groups are the same or different and each represents an alkylene group containing 2 to 18 carbon atoms, the majority of which are ethylene groups; n represents the average number of oxyalkylene groups and is a positive number; and E1 represents the mole ratio of the repeating unit in the polycarboxylic acid polymer (X), under the conditions that none of S1, T1 and E1 is equal to 0, that n is not less than 110, and that the weight average molecular weight Mw of said polycarboxylic acid polymer is not less than 10000 and not more than 500,000, and that T1 and E1 satisfy the relation;0.03&lE;E1/(T1+E1)&lE;0.3.