Process of making a diaphragm of carbonaceous materials for a sp

Details Process of making a diaphragm of carbonaceous materials for a sp Process of making a diaphragm of carbonaceous materials for a sp

1988-02-19

1989-08-08

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Carbonizing to form article

In specific atmosphere

264211, 423448, 423449, 524 87, 524 92, 524 98, 524495, C01B 3102, C08K 534

Patent

active

048550930

ABSTRACT:
A process for producing a diaphragm for a speaker of carbonaceous materials which includes the steps of mixing carbon powder in a binder mainly containing chlorine-containing vinyl resin to be carbonized after calcining, applying high shearing force to a mixture composition obtained by uniformly mixing and dispersing the resultant mixture to sufficiently knead the mixture, then preliminarily molding the resultant mixture in a sheet shape, molding the preliminarily molded sheet into a diaphragm, insolubilizing, infusibilizing the diaphragm and calcining the diaphragm in an inert atmosphere, wherein the mixture composition contains at least 0.1 to 5 percentage by weight of 1.8-diazobicyclo (5, 4, 0) undecene-7 or that in which its salt is chlorine-containing vinyl chloride. Thus, the process can simply and inexpensively produce a diaphragm having a high hardness, a high elasticity, a high strength, a light weight, an adequate internal loss, and thus less deformation by an external force, small distortion of sound, wide reproducing sound range, distinct sound quality and suitable for digital audio applications.

REFERENCES:
patent: 3171816 (1965-03-01), Peter et al.
patent: 4343376 (1982-08-01), Tsukagoshi et al.
patent: 4755337 (1988-07-01), Takahashi et al.
The Merck Index (9th. ed. 1976) at pp. 1252 & CI-254.

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