Patent ID: 7723283
Filing Date: 2010-05-25
Classification: C08L,C11D

Abstract:
1. A water-soluble amphoteric copolymer produced by a copolymerization of a monomer component comprising a cationic monomer (a), an anionic monomer (b), and an unsaturated polyalkylene glycol monomer (c), wherein the monomer (b) comprises a carboxyl group-containing monomer and optionally a sulfonic acid group-containing monomer (d), and the carboxyl group-containing monomer is more than 60% by mole relative to 100% by mole of a total amount of the monomers (a), (b), and (c), and the sulfonic acid group-containing monomer (d) is 3 to 30% by mole relative to 100% by mole of a total amount of the monomers (a), (d), and (c) if the anionic monomer (b) also comprises the sulfonic acid group-containing monomer (d), and the water-soluble amphoteric copolymer is produced by using a polymerization initiator and a chain transfer agent, and the chain transfer agent is 30 to 300% by weight relative to 100% by weight of the polymerization initiator.