Stauffer Chemical Company

Adam F Kopacki

Paul Kraft

John H Deatcher

Kenneth L Eilers

Robert H Brunner

An interpolymer which contains a crosslinked acrylate component formed by emulsion polymerization and a polyvinyl chloride component formed by suspension polymerization also comprises an effective amount for improved impact resistance of a plasticizer which is compatible with the acrylate component and which is incompatible with the polyvinyl chloride component.

Suspension-emulsion interpolymer containing tris(2-ethylhexyl) phosphate

A process is disclosed for preparing a polyacrylate-modified polyvinyl chloride processing aid for polyvinyl chloride by sequentially polymerizing the vinyl chloride and the desired acrylate ester monomer. Thus, a conventional vinyl chloride suspension polymerization is conducted at a controlled rate of agitation and in the presence of a specified concentration of suspending agent and is then halted at or near its completion; unreacted vinyl chloride monomer is removed, a minor proportion of an acrylate ester monomer, e.g., methyl methacrylate, which has been pre-mixed with a fresh supply of a free radical initiating catalyst is added and polymerization is resumed and continued until the acrylate ester monomer polymerizes in and/or on the particles of the previously polymerized polyvinyl chloride. The polyacrylate-modified PVC thereby recovered is an effective aid for processing conventional PVC, or it can be processed per se since it is suitable for calendering or extruding.

Polymer composition containing processing aid

There is disclosed a low temperature blending process for preparing formulations comprising a polyvinyl chloride resin intimately admixed with a polyacrylate-modified PVC process aid, these formulations being particularly suited for use in various forming processes such as extrusion, calendering and injection molding which result in the manufacture of shaped articles such as pipes, rods, sheets and films whose surfaces are characterized by their high degree of smoothness and glossiness.

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Westwood, NJ, United States of America

Adam F Kopacki