Abstract: A suspending agent system, a polymerizable reaction mixture, and a polymerization reaction process for producing high bulk density resin on a consistent basis by incorporating in the reaction mixture prior to initiation of the reaction about 1-250 parts per million by weight of polymerization inhibitor and also including about 0.001-0.1 parts by weight based on the weight of VCM of a highly hydrolyzed PVA. Preferred PVA's have a 4 weight percent aqueous solution viscosity of 30-100 centipoise and an effective polymerization inhibitor is diethylhydroxylamine. Bulk densities may be increased from about 3-10% depending upon the size of the reaction and the particular ingredients chosen.

Abstract: A polyvinyl chloride composition having superior processing and thermal stability properties is prepared by blending with the polyvinyl chloride a copolymer of an .alpha.-olefin and an unsaturated epoxy monomer, or a terpolymer of an .alpha.-olefin, an unsaturated epoxy monomer and an epoxy-free monomer, such as an acrylate ester.

Abstract: A high bulk density/low porosity polyvinyl chloride resin which is highly processable and thermally stable is prepared by suspension polymerization wherein a vinyl chloride monomer is polymerized in the presence of: hydroxyethyl cellulose; an internal lubricant-type long chain compound such as butyl stearate; and a water insoluble/monomer soluble initiator such as lauryl peroxide, and wherein the polymerization is performed under low shear conditions in the presence of a minimum amount of oxygen.

Abstract: A polyvinyl chloride composition having superior processing and thermal stability properties is prepared by blending with the polyvinyl chloride a copolymer of an .alpha.-olefin and an unsaturated epoxy monomer, or a terpolymer of an .alpha.-olefin, an unsaturated epoxy monomer and an epoxy-free monomer, such as an acrylate ester.