Patent ID: 8754264

Claim:
A (poly)alkylene glycol chain-containing polymer composition, comprising a polyalkylene glycol chain-containing polymer and an isomer of an unsaturated polyalkylene glycol ether monomer, wherein said isomer is defined by the following formula (6): B 2 —O—(R 1 O) n 2 —R 3 (6) wherein, B 2 is an organic group defined by the following general formula: R 4 may be the same or different and denotes a hydrogen atom or a hydrocarbon group having 1 to 20 carbon atoms; R 5 denotes a monovalent hydrocarbon group containing 1 to 20 carbon atoms; R 7 denotes a trivalent hydrocarbon group having 1 to 20 carbon atoms; R 1 O may be the same or different and denotes an oxyalkylene group having 2 to 18 carbon atoms; n 2 denotes an average addition mole number of the oxyalkylene group and is a numeral of 50 to 300; and R 3 denotes a hydrogen atom or a hydrocarbon group having 1 to 20 carbon atoms, and the polyalkylene glycol chain-containing polymer composition includes 0.01 to 10 parts by mass of the isomer to 100 parts by mass of the polyalkylene glycol chain-containing polymer, and wherein said (poly)alkylene glycol chain-containing polymer comprises a constituent unit derived from an unsaturated (poly)alkylene glycol ether monomer component is defined by the following general formula: wherein, R 1 O may be the same or different and denotes an oxyalkylene group having 2 to 18 carbon atoms; c denotes an average addition mole number of the oxyalkylene group and is a numeral of 50 to 300, and R 3 denotes a hydrogen atom or a hydrocarbon group having 1 to 20 carbon atoms, and wherein the unsaturated (poly)alkylene glycol ether monomer contains a polyalkylene glycol in an amount of 0.5 to 50% by mass in the unsaturated (poly)alkylene glycol ether monomer; wherein the polyalkylene glycol chain-containing polymer is obtained by polymerizing monomer components containing the unsaturated (poly)alkylene glycol ether monomer (monomer (i)) and an unsaturated carboxylic acid (monomer (ii)), wherein the unsaturated carboxylic acid contains acrylic acid or a salt thereof, and wherein the mixing ratios of the monomer (i), monomer (ii), and a monomer (iii) copolymerizable with the monomer (i) or the monomer (ii) or both are in a range in % by mass of monomer (i) /monomer (ii) /monomer (iii) of 45 to 97/3 to 25/0 to 30 and the total of monomer (i), monomer (ii) and monomer (iii) is 100% by mass.