Rohm and Haas Company

James Szkolnick Kempner

Morris C Wills

Hsing-Yeh Parker

Janis C Stevenson

Judith L Allison

Richard Shu-Hua Wu

Jill Ann Wudarski

A continuous process for preparing polymers is disclosed. The continuous process includes the steps of continuously feeding a reaction mixture containing a monomer into a non-cylindrical channel, continuously controlling the temperature of the non-cylindrical channel by exposing the surface of the non-cylindrical channel not exposed to the monomer to a temperature control medium, polymerizing the monomer in the non-cylindrical channel, and continuously removing the polymer from the non-cylindrical channel. The continuous process is suitable for the preparation of polymers containing ethylenically unsaturated monomers as polymerized units by emulsion polymerization, solution polymerization, and suspension polymerization.

Continuous polymerization in a non-cylindrical channel with temperature control

Core/shell additives, useful in modifying the processing and/or physical properties of poly(vinyl chloride) and other thermoplastic matrix polymers, are prepared separately at small particle sizes by emulsion polymerization, co-agglomerated, further encapsulated by a final shell, and isolated by spray-drying or coagulation. The isolated powders are readily re-dispersed to their original particle sizes in the matrix polymer.

Process for making encapsulated micro-agglomerated core/shell additives

Encapsulated micro-agglomerated core/shell additives in poly(vinyl

Co-microagglomeration of emulsion polymers (encapsulated core/shell

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Southampton, PA, United States of America

James Szkolnick Kempner