Patent Number: 6,166,149

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

Abstract: 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--CH.sub.2 --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.

Inventors: Yamaguchi; Shigeru (Yao, JP), Takagi; Masahito (Ibaraki, JP), Saeki; Takuya (Suita, JP)

Assignee: Nippon Shokubai Co., Ltd.

International Classification: C02F 5/10 (20060101); C08F 283/00 (20060101); C08L 51/00 (20060101); C08L 51/08 (20060101); C08F 283/06 (20060101); C08F 283/06 (); C02F 005/10 ()

Expiration Date: 12/26/2013