Water-soluble polymer, manufacturing method thereof, and detergent composition containing the water-soluble polymer

摘要

PCT No. PCT/JP96/00222 Sec. 371 Date Sep. 24, 1996 Sec. 102(e) Date Sep. 24, 1996 PCT Filed Feb. 2, 1996 PCT Pub. No. WO96/23822 PCT Pub. Date Aug. 8, 1996A water-soluble polymer is obtained by, for example, a polymerization reaction of a polyether compound with a number-average molecular weight of not less than 250 and not more than 1,900 containing at least 50 mole percent of ethylene oxide as a unit structure with 25 percent by weight to 40 percent by weight of a monomer component composed of 50 mole percent to 80 mole percent of ethylenically unsaturated monomer and 20 mole percent to 50 mole percent of ethylenically unsaturated dicarboxylic acid monomer. The described water-soluble polymer shows a specific optimal range of calcium ion capturing ability and anti-gelation properties. Furthermore, when adopting such water-soluble polymer as the detergent builder, significantly improved detergency and satisfactory performances can be obtained.