Patent ID: 6300275
Filing Date: 2001-10-09
Classification: A61L,B01J,C08F,C08J

Abstract:
A process, the process comprising dry blending a polymer with at least 0.5 percent of a multivalent metal salt, based on the weight of the mixture of the polymer and the salt, then intimately contacting the mixture with from 0.1 to 10 percent binder, based on the weight of the polymer and multivalent metal salt mixture, said binder being selected from the group consisting of water and an organic compound having a boiling point of at least 150.degree. C., wherein the contacting is conducted in the substantial absence of a volatile alcohol and in the substantial absence of a monovalent metal salt or ammonium salt of an oxyacid selected from sulfurous acid and thiosulfuric acid; and wherein the polymer is a polymer selected from saponification products of vinyl acetate acrylic ester copolymers, derivatives of copolymers of isobutylene and maleic anhydride, hydrolyzates of acrylonitrile copolymers, cross-linked products of hydrolyzates of acrylonitrile copolymers, polyaspartate hydrolyzates of acrylamide copolymers, cross-linked products of hydrolyzates of acrylamide copolymers, partially neutralized products of polyacrylic acids and cross-linked products of partially neutralized acids.