Patent ID: 9139671
Filing Date: 2015-09-22
Classification: C08F,C09K

Abstract:
1. A cross-linked polymer which is a polymer of a water-soluble ethylenically unsaturated monomer, the cross-linked polymer being cross-linked by a water-soluble crosslinking agent, wherein an aqueous liquid with a pH of 6.8 to 7.0 consisting of water and 1.0% by mass of the cross-linked polymer has an equilibrium compliance at 25° C. of 5.2×10 wherein the water-soluble ethylenically unsaturated monomer consists of at least one compound selected from the group consisting of acrylic acid and a salt thereof, methacrylic acid and a salt thereof, 2-acrylamide-2-methylpropane sulfonic acid and a salt thereof, acrylamide, methacrylamide, and N,N-dimethylacrylamide, and wherein the water-soluble crosslinking agent comprises a water-soluble sucrose allyl ether, and wherein an amount of the water-soluble crosslinking agent is in a range of 0.1 to 2.0% by mass with respect to the water-soluble ethylenically unsaturated monomer.