POLYBLENDS OF A COPOLYMER OF A VINYL AROMATIC MONOMER AND AN UNSATURATED DICARBOXYLIC ACID ANHYDRIDE WITH A METHYL METHACRYLATE HOMOPOLYMER OR COPOLYMER

摘要

A polyblend which has a high heat distortion temperature and good impact strength, and which may be transparent, is produced by blending 20 to 95 percent by weight of an anhydride polymer of a vinyl aromatic monomer, such as styrene or p-methylstyrene, with an unsaturated dicarboxylic acid anhydride, such as maleic anhydride, with 80 to 5 percent by weight of a methyl methacrylate homopolymer or copolymer, where at least one of the anhydride polymer or the methyl methacrylate polymer are rubber modified. Various other polymers or resins may be added to the blend, such as 10 to 60 weight percent of a vinyl chloride resin, or rubber modified vinyl chloride resin up to 20 percent of an ungrafted rubber, or up to 40 percent of a graft copolymer of a vinyl aromatic monomer and methyl methacrylate, methacrylonitrile, or acrylonitrile or mixtures, grafted onto 10-60 percent of a substrate rubber.