Patent ID: 7612133
Filing Date: 2009-11-03
Classification: C08K

Abstract:
1. A process for preparing a stabilized suspension/emulsion PVC polymer comprising (1) adding a polymer thermal stabilizer mixture compatible with the polymerization medium prior to, during or directly after the polymerization, prior to the isolation of the polymer from the polymerization medium, wherein the polymer thermal stabilizer mixture comprises: a) a perchlorate compound or salt thereof, and b) an alkanolamine of the formula (I) where x=1, 2 or 3; y=1, 2, 3, 4, 5 or 6; n=from 1 to 10; R R R R or salt thereof: and (2) adding to the pre-stabilized PVC polymer, after isolation of the polymer from the polymerization medium, one or more additives selected from the group consisting of heat-stabilizers, UV stabilizers, lubricants, plasticizers, pigments, fillers, metal soaps, antioxidants, wetting agents, optical brighteners, and antisettling agents.