Patent ID: 8415440
Filing Date: 2013-04-09
Classification: C08F,C08L

Abstract:
1. A plasticization modifying agent for polyvinyl chloride processing in the form of a high molecular weight polymer of an intrinsic viscosity of 7.8 to 13 dl/g, obtained from a monomer composition consisting of 60 to 95 parts by weight of C 1-8 alkyl methacrylate and 5 to 40 parts by weight of C 2-8 alkyl acrylate with a total of 100 parts, wherein the high molecular weight polymer is obtained by the following steps: adding 100 to 250 parts by weight of water into a reactor, and then adding the monomer composition consisting of 60 to 95 parts by weight of the C 1-8 alkyl methacrylate and 5 to 40 parts of weight of the C 2-8 alkyl acrylate with a total of 100 weight parts, 0.1 to 1.5 parts by weight of a surfactant and 0.001 to 0.2 parts by weight of a free-radical initiator into the same reactor one, two, or three times, wherein stirring resulting mixture solution at 50-500 round/min and heating the solution to 40-60° C. and maintaining temperature of the solution under 65° C., wherein after reacting 10-25 hours, obtaining a polymer emulsion, and drying the polymer emulsion to give the plasticization modifying agent for polyvinyl chloride processing, wherein the radical initiator is selected from the group consisting of potassium persulfate and ammonium persulfate, and wherein the intrinsic viscosity is measured in chloroform by an ubbelohde viscometer.