Patent ID: 6235205
Filing Date: 2001-05-22
Classification: C08F

Abstract:
A method for dewatering or clarifying a process stream comprising a suspension with a substance dispersed therein from the group consisting of food solids, biotechnological solids and oily waste, the method comprising (a) intermixing aqueous dispersion of polymers, or an aqueous admixture prepared by intermixing said aqueous dispersion with water, in an amount effective for dewatering or clarifying, with the suspension of dispersed substance, and (b) dewatering or clarifying the suspension of dispersed substance, said aqueous dispersion being comprised of (i) a discontinuous phase containing polymer that is comprised of a first cationic water-soluble or water-swellable polymer having at least one first recurring unit of the formula (I), ##STR4##wherein R.sub.1 is H or CH.sub.3, A is O or NH, B is an alkylene or branched alkylene or oxyalkylene group having from 1 to 5 carbons, R.sub.2 is a methyl, ethyl, or propyl group, R.sub.3 is a methyl, ethyl, or propyl group, R.sub.4 is a methyl, ethyl or propyl group, X is a counterion, and R.sub.2, R.sub.3, and R.sub.4 together contain a total of at least 4 carbon atoms; and (ii) a polyamine.