Tenneco Chemicals, Inc.

Tenneco Polymers, Inc.

Olin Corporation

Donald Goodman

Marvin Koral

Robert S Miller

Robert J Stanaback

Samuel Hoch

Mario Q Ceprini

Martin L Feldman

William Frederick Cordes, Iii

Edwin T Chesler

Zaev Sharaby

Milton Lapkin

Vinyl chloride polymers are prepared by polymerizing a monomer component that comprises vinyl chloride in an aqueous medium in the presence of a free radical-generating polymerization initiator and 0.01% to 2% by weight, based on the weight of the monomer component, of a chain-transfer agent that is a mercapto organic compound having at least one beta-ether linkage. The process can be used to produce low molecular weight vinyl chloride polymers.

Process for the production of vinyl chloride polymers in the presence of

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.

Process for the production of vinyl halide polymers that uses an

Conductive molding compositions comprise a vinyl chloride-vinyl ether copolymer that contains as comonomer a vinyl ether having the structural formula

Conductive molding compositions comprising vinyl chloride-vinyl ether

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.

Process for the production of aqueous dispersions of solid free

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.

Aqueous dispersions of free radical-generating polymerization initiators

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 a dialkylhydroxyphenylalkanoic acid ester of a neopentyl polyhydric alcohol, such as pentaerythritol tetrakis-[3-(3,5-di-tert.butyl-4-hydroxyphenyl)propionate].

Production of vinyl halide polymers with dialkyl, hydroxy phenyl

Vinyl chloride is removed from aqueous slurries prepared by the suspension polymerization of a monomer component that comprises vinyl chloride by heating the slurries at a temperature between 70.degree. C. and the boiling point of water at a pressure in the range of 30 mm Hg absolute to 3 atmospheres and removing the evolved vinyl chloride until the aqueous slurry contains less than 50 ppm and preferably less than 0.1 ppm of vinyl chloride, based on the weight of polymer in the slurry. The polymers that are recovered from the purified aqueous slurries contain less than 10 ppm, and in most cases less than 0.1 ppm of vinyl chloride.

Process for the removal of vinyl chloride from aqueous slurries of vinyl

Vinyl chloride is removed from polyvinyl chloride dispersions, latexes, and slurries by sparging them with an inorganic gas, such as air or ammonia, while they are maintained at subatmospheric pressure.

Process for the removal of vinyl chloride from polyvinyl chloride

Vinyl chloride is removed from polyvinyl chloride dispersions and latexes by adding to them from 2% to 8% by weight of a polar water-soluble organic compound that has a boiling point between about 50.degree. C. and 150.degree. C. and sparging the resulting mixtures with a gas, such as nitrogen, while they are maintained at subatmospheric pressure.

Vinyl chloride is removed from polyvinyl chloride dispersions, latexes, and slurries by sparging them with a gaseous organic compound, such as methane, while they are maintained at subatmospheric pressure.

An improved method for preparing polyvinyl chloride resins by suspension polymerization wherein the reaction vessel is placed under a limited, selected atmosphere of air, oxygen or nitrogen gas prior to charging starting vinyl chloride monomer material.

Vinyl chloride polymerization using selected amounts of air, oxygen or

Vinyl chloride is removed from wet cakes that comprise a vinyl chloride polymer, vinyl chloride, and water by contacting the wet cakes with steam, preferably at atmospheric pressure and at a temperature in the range of 100.degree. to 125.degree.C.

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Flemington, NJ, United States of America

Donald Goodman