Inventors:
Robert Smith - Harleysville PA, US
Katherine Rice - Glenside PA, US
Kirk Moyer - Yardley PA, US
Richard Ketz - Princeton NJ, US
Eugene Dougherty - Langhorne PA, US
Patricia Lesko - Ottsville PA, US
International Classification:
C08F002/22
US Classification:
524/458000, 525/902000, 523/201000, 526/087000, 526/091000, 526/093000
Abstract:
An improved process for preparing an aqueous dispersion of plastics additive polymer particles using emulsion polymerization of one or more ethylenically unsaturated monomers in an aqueous medium in the presence of a free radical redox initiator system is described. The free radical redox initiator system uses an oxidizing agent, a reducing agent, and a combination of metal ion species. The plastics additive polymer particles are useful as processing aids and impact modifiers in PVC articles.