Diphenylmethane-containing dianhydride and polyimides prepared t

Details Diphenylmethane-containing dianhydride and polyimides prepared t Diphenylmethane-containing dianhydride and polyimides prepared t

1991-08-26

1993-06-08

Kight, III, John

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528125, 528126, 528128, 528172, 528173, 528179, 528182, 528185, 528220, 528229, 528351, 528352, 528353, C08G 7310, C08G 6926, C08G 802

Patent

active

052180778

ABSTRACT:
A high-temperature stable, highly optically transparent-to-colorless, low dielectric linear aromatic polyimide is prepared by reacting an aromatic diamine with 3,3'bis(3,4-dicarboxyphenoxy)diphenylmethane dianhydride in an amide solvent to form a linear aromatic polyamic acid. This polyamic acid is then cyclized to form the corresponding polyimide, which has the following general structural formula: ##STR1## wherein Ar is any aromatic or substituted aromatic group, and n is 10-100.

REFERENCES:
patent: 4595548 (1987-06-01), St. Clair et al.
patent: 4634760 (1987-01-01), Takekoshi et al.
patent: 4895972 (1990-01-01), Stoakley et al.
patent: 5061783 (1991-10-01), St. Clair

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