Patent ID: 6762220
Filing Date: 2004-07-13
Classification: C04B

Abstract:
A cement additive comprising:(a) a polycarboxylic acid copolymer and/or a salt thereof and a polyalkylene glycol compound, wherein said polycarboxylic acid copolymer contains at least one species of copolymer derived from at least an unsaturated polyalkylene glycol ether monomer (A) and an unsaturated mono- or dicarboxylic acid monomer (B) as its monomer component; or (b) a polycarboxylic acid copolymer and/or a salt thereof and a polyalkylene glycol compound, wherein said polycarboxylic acid copolymer contains at least one species of copolymer derived from at least an unsaturated polyalkylene glycol ether monomer (A) and an unsaturated mono- or dicarboxylic acid monomer (B) as its monomer component and said polycarboxylic add copolymer is additionally derived from an unsaturated polyalkylene glycol ester monomer (C) and/or monomer (D), which is copolyermerizable with monomers (A) and (B), or with monomers (A), (B) and (C); wherein for (a) and (b), the monomer (A) is a compound according to general formula (1) wherein R1, R2 and R3 are each independently hydrogen or methyl, provided that not all are methyl; R4 is â€”CH2Oâ€”, â€”(CH2)2Oâ€”, â€”C(CH3)2Oâ€” or â€”Oâ€”; the total carbon number of R1, R2, R3 and R4 is 3; R5O is one or more species of C2-C4 oxyalkylene groups, and, in the case of two or more species is optionally block or random; R8 is hydrogen or a C1-C22 alky, phenyl or C1-C18 alkylphenyl group; p is an integer from on average 1 to 100, the monomer (B) is a compound according to general formula (2): wherein R7 and R8 are each independently hydrogen or methyl; R9 is hydrogen, methyl or â€”(CH2)qCOOM2; R10 is â€”(CH2)râ€”, q and r are each independently an integer from 0 to 2, M1 and M2 are a monovalent metal, a divalent metal, ammonium or an organic amine; the monomer (C) is a compound according to general formula (3); wherein R11 and R12 are each independently hydrogen, methyl or (CH2)uCOOM3, u is an integer from 0 to 2, M3 is a monovalent metal, a divalent metal, ammonium or an organic amine; R13O is one or more species of C2-C4 oxyalkylene groups, and, in the case of two or more species, is optionally block or random; R14 is a C1-C22 hydrogen or an alkyl, phenyl or C1-C22 alkylphenyl group; s is an integer from 0 to 2; t is an integer an average from 1 to 300; and the monomer (D) is a compound according to the following general formula (4): wherein R15, R16, R16 and R19 are each independently hydrogen or methyl, provided that not all are methyl; R17O is one or more species of C2-C4oxyalkylene groups, and in the case of two or more species, is optionally block or random; w is an integer an average from 1 to 300; v and x are each independently an integer from 0 to 2; which contains 100 weight parts of polycarboxylic acid copolymer and 10-50 weight parts of polyalkylene glycol in mixing proportion.