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

1980-03-24

1982-07-27

Jacobs, Lewis T.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Physical dimension specified

428402, 428408, 523220, 524525, 524567, B32B 2730

Patent

active

043418384

ABSTRACT:
A molding composition comprising a thermoplastic resin in admixture with flaky graphite and carbon black is molded into an acoustic article which shows a high specific modulus of elasticity due to graphite and an increased internal loss due to carbon black. Preferred molding compositions contain 10-90 wt % of polyvinyl chloride or a vinyl chloride-vinyl acetate copolymer and 90-10 wt % of graphite flakes plus carbon black submicron particles. Carbon black is present in an amount of 0.1-2 parts per part of flaky graphite. Speaker diaphragms, arm pipes and head shells are fabricated from the molding composition. The composition is kneaded and rolled to orient the graphite flakes, and subsequently molded into an article, which is then optionally carbonized or graphitized.

REFERENCES:
patent: 3399103 (1968-08-01), Salyer et al.
patent: 3399104 (1968-08-01), Ball et al.
patent: 3775359 (1973-11-01), Georgiana et al.
patent: 3918722 (1975-11-01), Nakajima et al.
patent: 4221773 (1980-09-01), Tsukagoshi et al.
patent: 4228050 (1980-10-01), Martin et al.

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