Patent ID: 8859702
Filing Date: 2014-10-14
Classification: C04B,C08F

Abstract:
1. A method of producing a polymer-containing composition for dispersants for cement, the composition comprising a polymer comprising a repeating unit derived from an unsaturated polyalkylene glycol ether monomer (I) and a repeating unit derived from an unsaturated carboxylic acid monomer (II), wherein the unsaturated polyalkylene glycol ether monomer (I) is represented by the following formula (1): wherein AO is a C2-C18 oxyalkylene group; and m is an average addition number of moles of the oxyalkylene groups and is 40 to 250, the unsaturated carboxylic acid monomer (II) is represented by the following formula (2): wherein R 3 and R 4 , which are the same or different, each are a hydrogen atom, a methyl group, or —COOM 2 and are not both —COOM 2 ; R 5 is a hydrogen atom, a methyl group, or —CH 2 COOM 3 ; R 3 and R 4 , which are the same or different, each are a hydrogen atom or a methyl group when R 5 is —CH 2 COOM 3 ; M 1 , M 2 , and M 3 each are a hydrogen atom, a monovalent metal, a divalent metal, ammonium, or an organic amine, the method comprising a step of polymerizing an unsaturated polyalkylene glycol ether monomer (I)-containing composition and the unsaturated carboxylic acid monomer (II), wherein the unsaturated polyalkylene glycol ether monomer (I)-containing composition comprises 1 to 5% by mass of a polyalkylene glycol (A) and 1 to 5% by mass of an isomer (B) of the unsaturated polyalkylene glycol ether monomer (I) in which the double bond is transferred, based on 100% by mass of the unsaturated polyalkylene glycol ether monomer (I).