Polyimide precursor, cured product thereof, and processes for pr

Details Polyimide precursor, cured product thereof, and processes for pr Polyimide precursor, cured product thereof, and processes for pr

1991-10-21

1993-12-21

Kight, III, John

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

Synthetic resins

From carboxylic acid or derivative thereof

528125, 528128, 528170, 528172, 528173, 528176, 528183, 528185, 528188, 528220, 528229, 528322, 528342, 528345, 528350, 528351, C08G 6926, C08G 7310

Patent

active

052722473

ABSTRACT:
The present invention provides a polyimide having all of small dielectric constant, small thermal expansion coefficient, high heat resistance, high glass transition temperature and high mechanical properties, a precursor of the polyimide, and processes for producing them. A polyimide precursor whose molecular chain comprises repeating units represented by the following general formula (1) and repeating units represented by the following general formula (2): ##STR1## wherein R.sup.1 is at least one kind of tetravalent organic group selected from the group consisting of ##STR2## R.sup.2 is at least one kind of divalent organic group having a linear structure which is selected from the group consisting of ##STR3## m is an integer of 1 to 4, and R.sup.3 is a divalent organic group having a non-linear structure which contains at least two aromatic rings.

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