Plastics additives: improved process, products, and articles containing same
OwnerRobert Julian Smith, Katherine Sue Rice +4inventors
InventorsRobert Julian Smith, Katherine Sue Rice, Kirk Harold Moyer, Richard John Ketz JR., Eugene Patrick Dougherty, Patricia Marie Lesko
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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.
Claims11
A process for preparing an aqueous dispersion of plastics additive polymer particles, comprising the steps of
- emulsion polymerizing one or more ethylenically unsaturated monomers in an aqueous medium in the presence of a free radical redox initiator system, wherein the free radical redox initiator system comprises an oxidizing agent, a reducing agent, and from 0.01 to 5.00 ppm based on monomer weight total iron and copper metal ion species.
A polymeric composition for use in modifying the properties of thermoplastic resins, the composition comprising polymer particles prepared by emulsion polymerizing one or more ethylenically unsaturated monomers in an aqueous medium in the presence of a free radical redox initiator system, wherein the free radical redox initiator system comprises an oxidizing agent, a reducing agent, and from 0.01 to 5.00 ppm based on monomer weight total iron and copper metal ion species.
A thermoplastic resin blend comprising
- (a) from 1 to 99 weight percent of a thermoplastic resin;
- and
- (b) from 99 to 1 weight percent of a polymeric composition for use in modifying the properties of thermoplastic resins, the composition comprising polymer particles prepared by emulsion polymerizing one or more ethylenically unsaturated monomers in an aqueous medium in the presence of a free radical redox initiator system, wherein the free radical redox initiator system comprises an oxidizing agent, a reducing agent, and from 0.01 to 5.00 ppm based on monomer weight total iron and copper metal ion species.
Dependencies are inferred from the claim text.