Copolyimide ODPA/BPDA/4,4'-ODA or P-PDA

Details Copolyimide ODPA/BPDA/4,4'-ODA or P-PDA Copolyimide ODPA/BPDA/4,4'-ODA or P-PDA

1991-08-05

1992-12-15

Foelak, Morton

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

Synthetic resins

From carboxylic acid or derivative thereof

528125, 528126, 528128, 528170, 528171, 528172, 528173, 528184, 528185, 528188, 528220, 528229, 528350, 528351, 525432, 428355, 428343, 428379, 428458, 4284735, C08G 6926, C08G 802, C08G 7310

Patent

active

051718286

ABSTRACT:
Polyimide copolymers are disclosed having the recurring structure ##STR1## wherein AR is AR.sub.1 or AR.sub.2, wherein AR.sub.1 is ##STR2## and wherein AR.sub.2 is ##STR3## provided that the molar ratio of AR.sub.1 to AR.sub.2 is 3:1 to 1:3, and wherein AR.sub.3 is ##STR4## These polyimides have unexpected properties which are useful in various electronic applications.

REFERENCES:
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patent: 3528950 (1970-09-01), Rogers
patent: 3959350 (1976-05-01), Lubowitz
patent: 4063993 (1977-12-01), Burns
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patent: 4290936 (1981-09-01), Sasaki et al.
patent: 4537947 (1985-08-01), D'Alelio
patent: 5077382 (1991-12-01), Meterko et al.

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