COMPOSICAO POLIMERICA

1491332 Compositions containing vinyl chloride polymers and polycarbonates BAYER AG 14 Jan 1975 [17 Jan 1974] 1525/75 Headings C3G C3P and C3R A moulding composition comprises (a) 20 to 90% of polyvinyl chloride or copolymer of vinyl chloride with up to 30% by weight of at least one vinyl comonomer (b) 10 to 80% by weight of a polycarbonate containing at least 50% by weight of units of the formula where X is a single bond, O, CO, SO 2 , C 1 -C 10 alkylene, C 2 -C 10 alkylidene, C 5 -C 15 cycloalkylene, C 5 -C 15 cycloalkylidene, C 5 -C 20 cycloalkyl-alkylidene or the group and (c) 0 to 100% by weight of a rubber or a mixture of a rubber and a thermoplastic resin other than a vinyl chloride polymer a graft copolymer or a vinyl monomer on a rubber or a mixture of said graft copolymer and said thermoplastic resin; the percentages of (a), (b) and (c) being based on the combined weight of (a) and (b). The exemplified compositions are prepared by mixing polyvinyl chloride having a Fiktenscher k value of 68 stabilized with a mixture of stearyl stearate, montanic acid ester, distearyl phthalate, polyethylene wax and di-n-octyl tin dithioglycollic acid ester and a polycarbonate based on 2,2-bis(3,5-dimethyl-4-hydroxyphenyl) propane as solids or in solution in cyclopentanone and methylene chloride respectively or by dry mixing said polymers with a graft copolymer of styrene and acrylonitrile or methylmethacrylate and polybutadiene.