Patent ID: 8404784
Filing Date: 2013-03-26
Classification: C08G,C08L

Abstract:
1. A process of making cross-linked polyallylamine carbonate salt comprising: (a) reacting homopolymer of polyallylamine hydrochloride with carbonate and/or bicarbonate ions to form polyallylamine carbonate and/or bicarbonate salt, wherein the ratio of amine group of the polyallylamine hydrochloride to the carbonate and/or bicarbonate ions is about 1:0.2 to about 1:0.6; (b) cross-linking the polyallylamine carbonate and/or bicarbonate salt obtained in step (a) with a cross-linking agent, in the presence of sodium hydroxide to form a wet gel; (c) reducing the particle size of the wet gel obtained in step (b); (d) purifying the wet gel particles obtained in the step (c) with water or an aqueous solvent mixture to significantly remove the ionic impurities; and (e) drying the purified gel particles obtained in step (d).