| abstract |
Vinyl halide polymers characterized by superior mill roll release at high temperature and resistance to ''''plate out,'''' are attained by modifying the polymers with a multiphase acrylic composite polymer comprising (A) a first non-crosslinked phase of molecular weight of up to 450,000 polymerized from a first monomer emulsion or solution of at least 25 weight percent of at least one alkyl acrylate, wherein said alkyl group has 1 to 18 carbon atoms, 0 to 75 weight percent of another acrylic monomer and 0 to 75 percent of another copolymerizable ethylenically unsaturated monomer, and (B) a final, rigid thermoplastic phase polymerized in the presence of the first phase from an emulsion or solution of about 35 to 100 weight percent of at least one monomer which is a methacrylate, acrylate, styrene or substituted styrene, 0 to 65 weight percent of another acrylic monomer, and 0 to 65 weight percent of another copolymerizable ethylenically unsaturated monomer, wherein the rigid thermoplastic phase has a molecular weight of from about 400,000 to about 5 X 10.hu 6. |