Chemistry of carbon compounds – Miscellaneous organic carbon compounds
Patent
1976-05-19
1978-05-09
Marquis, Melvyn I.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
260 23AR, 260 23S, 260 285AV, 260 285R, 526329, C08L 9100
Patent
active
040886174
ABSTRACT:
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.
REFERENCES:
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patent: 3427275 (1969-02-01), Davis et al.
patent: 3640977 (1972-02-01), Gozenbach et al.
patent: 3917552 (1975-11-01), Bischoff et al.
patent: 3922255 (1975-11-01), Koestler et al.
patent: 3953408 (1976-04-01), Hosoi et al.
Alsberg Henry
Meisenhelder William C.
Skalla Dale
Marquis Melvyn I.
The Richardson Company
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