Hydrophilic graft polymer, production process therefor, composition containing the polymer, and use thereof

摘要

The invention provides: 1) a composition comprising a hydrophilic graft polymer of 60 to 98 wt%, a polyether compound of 20 to 40 wt%, and an unsaturated carboxylic acid type polymer of 0 to 5 wt%; 2) a polymer which is obtained by graft-polymerizing a monoethylenically unsaturated monomer onto a polyether compound having a repeating unit of -RCH-CH2-O- of 30 mol% or more of the polyether compound, and has a purity of at least 75%; and 3) a scale inhibitor comprising a polymer which is obtained by graft-polymerizing a monoethylenically unsaturated monomer onto a polyether compound having ethylene oxide of 80 mol% or more as a structural unit, and has a hydroxyl group value of 30 mgKOH/g or more and an acid value of 200 mgKOH/g or more.