Patent ID: 7323510
Filing Date: 2008-01-29
Classification: C08J

Abstract:
1. A method for manufacturing a water-in-water polymer dispersion containing a water-soluble and/or water-swellable polymer A and at least one polymeric dispersant B, comprising: a) dispersing monomers in an aqueous phase containing the water-soluble dispersant B to form a monomer dispersion, wherein said monomers consist of one or more of the monomers (i), (ii), and (iii): b) adding a water-soluble salt; c) subjecting the monomer dispersion formed in b) to a radical polymerization to form a dispersion of the water-soluble or water-swellable polymer A, and, after polymerization; d) adding a water-soluble acid to the dispersion of the water-soluble and/or water-swellable polymer A; wherein the polymeric dispersant B is a cationic polymer comprising at least 30% by weight of polymerized cationic monomer, and the acid is added in an amount of from 0.1 to 5% by weight and the salt is added in an amount of up to 3% by weight, where the total quantity of salt and acid is a maximum of 5% by weight; wherein % by weight is based on the total weight of the dispersion.