Abstract: This invention relates to a polymerization reaction vessel having a coating on the inner surfaces thereof resulting from applying thereto an aqueous coating composition containing an unneutralized lightly crosslinked interpolymer of one or more carboxylic acid monomers with a polyunsaturated compound having a plurality of terminally unsaturated polymerizable groups whereby polymer buildup on said inner surfaces is substantially eliminated. Optionally, there is employed in the coating composition a water-soluble surfactant which contains polyether-type hydrophilic segments, such as, for example, polyoxyethylene (20) sorbitan monooleate. Multiple charges or batches of polymer can be made in said internally-coated reaction vessel without opening the same between charges, thus preventing the escape of unreacted monomer to the surrounding atmosphere.

Abstract: Polyvinyl chloride resin in particulate form characterized by said resin particles being spherical in shape and said resin having low amounts of glassy content. Extrudates, such as pipe, formed from the novel resin of this invention have high impact strength. The novel resin of this invention has high bulk density and fast extrusion rates.

Abstract: Polyvinyl chloride resin in particulate form characterized by said resin particles being spherical in shape and said resin having low amounts of glassy content. Extrudates, such as pipe, formed from the novel resin of this invention have high impact strength. The novel resin of this invention has high bulk density and fast extrusion rates.

Abstract: Process for making porous, substantially spherical particles having high bulk density of vinyl polymers or resins by the use of the suspension polymerization technique. In the polymerization there is employed a water-insoluble dispersant comprised of a substantially unneutralized crosslinked interpolymer of one or more carboxylic acid monomers with a polyunsaturated compound having a plurality of terminally unsaturated polymerizable groups and a surfactant system comprising at least one surfactant selected from the group consisting of a polyethylene oxide containing surfactant and a non-polyethylene oxide containing surfactant. Excellent results are obtained when both a polyethylene oxide and a non-polyethylene oxide containing surfactant are used in the process of the invention. Rapid stirring or high agitation is used while employing a monomer-soluble free radical yielding polymerization catalyst.

Abstract: Process for making porous, substantially spherical particles of vinyl polymers or resins by the use of the suspension polymerization technique. In the polymerization there is employed a water-insoluble dispersant comprised of a substantially unneutralized crosslinked interpolymer of one or more carboxylic acid monomers with a polyunsaturated compound having a plurality of terminally unsaturated polymerizable groups and optionally a water-soluble surfactant with a polyether type hydrophilic segment using rapid stirring or high agitation while employing a monomer-soluble free radical yielding polymerization catalyst. When using the new process, the polymer buildup in the reactor is substantially reduced.

Abstract: Improved thermoset or vulcanized polyurethane elastomers are obtained by adding to liquid polyurethane reactants, prior to reaction to form the polyurethane, organic peroxides having a half-life value of greater than one hour at 100.degree. C. Such mixtures may be heated to form the polyurethane article and thereafter thermoset or vulcanized, or the polyurethane containing the unactivated peroxide may be provided in sheet, crumbs, granules or otherwise and then formed and heated to thermoset or vulcanize the polyurethane.

Abstract: Viscosity stable polyurethane solutions in polar solvents as N,N-dimethylformamide are obtained when such solutions contain small amounts of ammonium salts of strong acids, such salts include ammonium chloride and nitrate.