| 摘要 |
A phonograph record molding composition formed by copolymerizing a vinyl aromatic monomer with an acrylic ester monomer in the presence of one or more waxes which composition is especially suitable for injection and compression molding and which is characterized by substantially improved wear resistance, particularly when compared to conventional polystyrene record molding materials. The compositions of this invention comprise about 90 to 98, preferably 94 to 97, weight percent of vinyl aromatic/acrylic ester copolymer (with the weight ratio of vinyl aromatic to acrylic ester of from about 10:1 to 40:1), about 1 to 9, preferably 3 to 6, weight percent of the wax component and about 0.1 to 3, preferably 0.1 to 0.8, weight percent of a suitable lubricant. Preferred copolymers are styrene/2-ethylhexyl acrylate and styrene/stearyl methacrylate copolymers.
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