Polystyrene phonograph record injection molding compositions of

Details Polystyrene phonograph record injection molding compositions of Polystyrene phonograph record injection molding compositions of

1978-07-07

1979-11-27

Schofer, Joseph L.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260 326R, 264328, C08L 2506, C08F 244

Patent

active

041761049

ABSTRACT:
Phonograph record molding compositions having polystyrene as the major constituent are formulated to have wear resistance properties superior to other polystyrene injection molded compositions while generally retaining the transparency of unmodified polystryene. Ethylene-bis-stearamide or a homolog or analog thereof is dissolved within styrene monomer and then the monomer is polymerized to obtain a polystryene matrix having a molecular distribution of ethylene-bis-stearamide or the like within and throughout the matrix. Preferably, the ethylene-bis-stearamide or the like is combined with a wax such as an olefin-based wax or a microcrystalline wax.

REFERENCES:
patent: 2132388 (1938-10-01), Berchet
patent: 2267685 (1941-12-01), Kyrides
patent: 2752315 (1956-06-01), Kuettel
patent: 3751388 (1973-08-01), Tabona et al.
patent: 3888894 (1975-06-01), Thompson

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