Flame-retarded acoustic diaphragm

Details Flame-retarded acoustic diaphragm Flame-retarded acoustic diaphragm

1982-06-24

1984-05-29

Griffin, Ronald W.

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...

181169, 428530, 524702, 524733, 524877, G10K 1300, H04R 700

Patent

active

044516096

ABSTRACT:
A flame-retarded speaker diaphragm is prepared by making a cone from cellulose fibers, impregnating the cellulosic cone with a solution of a trimethylol melamine monomer, an organic phosphorus- and nitrogen-containing compound, and a trialkyl amine catalyst in an alcohol solvent, and heating the impregnated cone until the solvent is removed and the melamine resin is cured. Flame retardancy is imparted to the cellulose cone-shaped diaphragm without the sacrifice of its frequency response.

REFERENCES:
patent: 1927902 (1933-09-01), Rose
patent: 2376200 (1945-05-01), Smidth
patent: 3865783 (1975-02-01), Clutter
patent: 3907063 (1975-09-01), Nakazawa et al.

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