Molding compositions and diaphragms, arm pipes and head shells m

Details Molding compositions and diaphragms, arm pipes and head shells m Molding compositions and diaphragms, arm pipes and head shells m

1980-05-08

1983-09-13

Jacobs, Lewis T.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

524524, 524527, 524495, 524496, C08L 3104, C08L 3504, C08L 2704

Patent

active

044043155

ABSTRACT:
A molding composition is obtained by blending flaky graphite with a resin component comprising a mixture of a thermoplastic resin having a glass transition temperature higher than room temperature and another thermoplastic resin having a glass transition temperature lower than room temperature. The composition is kneaded and rolled into a sheet to orient the graphite flakes parallel to the surface of the sheet. The rolled sheet is then molded into an article, for example, speaker diaphragm, arm pipe and head shell, which may be optionally be carbonized or graphitized. The resulting article exhibits improved physical properties, especially high specific modulus of elasticity comparable to aluminum and beryllium as well as good internal loss comparable to paper.

REFERENCES:
patent: 2550139 (1951-04-01), Daly
patent: 3275716 (1966-09-01), Wiggins
patent: 3316327 (1967-04-01), Baer et al.
patent: 3399103 (1968-08-01), Salyer et al.
patent: 3399104 (1968-08-01), Ball et al.
patent: 3419511 (1968-12-01), Condo et al.
patent: 3642954 (1972-02-01), Turner
patent: 4088625 (1978-05-01), Gubisch et al.
patent: 4173596 (1979-11-01), DeWitt
patent: 4259460 (1981-03-01), Schwarz

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