Abstract: The polymerization of a monomer component that comprises vinyl chloride in an aqueous medium in the presence of a free radical generating polymerization initiator is terminated by introducing into the polymerization reaction mixture when from 70% to 95% of the monomer component has been polymerized from 0.01% to 0.10% by weight, based on the weight of the monomer component, of a chain-terminating agent that is an alkyl-substituted trisphenol, such as 1,1,3-tris(2-methyl-4-hydroxy-5-tert.butylphenyl)butane.

Abstract: Stable aqueous dispersions of free radical-generating polymerization initiators that are solid at temperatures above 0.degree. C. are prepared safely and efficiently by homogenizing a suspension of the initiator in an aqueous system that contains small amounts of a suspending agent and a wetting agent.

Abstract: An aqueous dispersion of a free radical-generating polymerization initiator that is a shelf-stable liquid at temperatures at which the initiator can be stored safely comprises 10% to 50% by weight of a liquid free radical-generating polymerization initiator, 0.8% to 3% by weight of a suspending agent, 0.1% to 1.0% by weight of a wetting agent, and 0 to 50% by weight of an antifreeze additive.

Abstract: Heat-stable vinyl halide resin compositions comprise (a) a vinyl halide resin prepared by the polymerization of a vinyl halide-containing monomer component in an aqueous medium in the presence of a free radical generating polymerization initiator and a chain-terminating agent that is an ortho-dihydric phenol and (b) a liquid antimony stabilizer composition.

Abstract: Shelf-stable liquid antimony stabilizer compositions for vinyl halide resin compositions comprise a liquid antimony organic sulfur- and/or oxygen-containing compound, such as antimony tris-(isooctyl thioglycolate), and a stabilizing amount of an acidic organic compound that may be a mercaptoacid ester, mercaptan, mercaptoacid, mercaptoalcohol, monocarboxylic acid, or a mixture thereof.

Abstract: Partial (2,2,4-trimethylpentane-1,3-diol monoisobutyrate) esters of polycarboxylic acids and water-soluble salts of these esters are useful in the manufacture of vinyl halide resins that have excellent optical properties.

Abstract: Organotin esters from acid esters of di or poly carboxylic acids are made by adding a base to a mixture of an organotin halide and the acid ester in the presence of water, and reacting to form the organotin ester, the amount of base and acid ester being to provide 0.9-1.3 equivalents and at least 0.9 equivalents respectively per g. atom of halogen in the organotin halide, and the conditions being such as not to cause substantial hydrolysis.

Abstract: Stabilizer systems for vinyl halide resin compositions comprise(a) a liquid, oil-soluble, epoxidized vegetable oil-compatible overbased barium salt complex that is the product obtained by contacting a reaction mixture that consists essentially of a basic barium compound, an alkylphenol, and an inert liquid organic diluent, in the amounts of at least 0.75 mole of alkylphenol per mole of barium compound and 10% to 50% by weight of the diluent, based on the weight of the reaction mixture, with carbon dioxide while the reaction mixture is maintained at a temperature of at least 180.degree. C.;(b) a polyvalent metal salt component;(c) an organic phosphite component; and(d) a hydrocarbon solventIn the amounts of 0.1 part to 5 parts by weight of the polyvalent metal salt component, 0.1 part to 5 parts by weight of the organic phosphite component, and 0.1 part to 5 parts by weight of the hydrocarbon solvent per part by weight of the overbased barium salt complex.

Abstract: Vinyl halide resin compositions that are characterized by excellent early color and color hold, excellent long term heat and light stability, and good processability contain a liquid stabilizer system that comprisesA. 40% to 90% by weight of an organotin ethanol mercaptide having the structural formula ##STR1## WHEREIN EACH R represents an alkyl group having 1 to 8 carbon atoms, R' represents --SCH.sub.2 CH.sub.2 OH, --SCH.sub.2 COOR", or --SR",R" represents an alkyl group having 6 to 18 carbon atoms,a, b, m, and n each represents 1 or 2,X represents 0 or 1,When X is 0, m + n + b = 4, andWhen X is 1, m + n = 3 and a + b = 3;B. 10% to 60% by weight of a liquid alcohol component comprising a glycol having 2 to 10 carbon atoms; andC. 0.1% to 1% by weight of an alkyl acid phosphate.

Abstract: Stable solutions that contain at least 7.5% by weight of dissolved chromium comprise an organic solvent and a mixture of chromium salts that contains at least one chromium salt of a straight-chain aliphatic monocarboxylic acid having 5 to 10 carbon atoms and at least one chromium salt of a branched-chain aliphatic monocarboxylic acid having 5 to 10 carbon atoms.