Patent ID: 9315645
Filing Date: 2016-04-19
CPC Classification: C01P,C08F,C08K,C09C,C09D

Claim Text:
1. An aqueous poly(meth)acrylic acid and/or salt thereof solution comprising a poly(meth)acrylic acid and/or salt thereof having a weight average molecular weight of 1000 to 10000 polymerized in the presence of a phosphorus compound containing a hypophosphorous acid and/or salt thereof, wherein the phosphorus compound contains a phosphorous acid and/or salt thereof and a total amount of the phosphorous acid and salt thereof is greater than 0% by mass to 0.3% by mass based on 100% by mass of the phosphorus compound, and the aqueous poly(meth)acrylic acid and/or salt thereof solution contains 0 to 10000 ppm of an inorganic anion.