Copolyimides and a process for the preparation thereof

Details Copolyimides and a process for the preparation thereof Copolyimides and a process for the preparation thereof

1994-06-30

1995-09-26

Michl, Paul R.

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

Synthetic resins

From carboxylic acid or derivative thereof

528125, 528128, 528172, 528173, 528176, 528183, 528188, 528220, 528229, 528350, 528351, 524600, 524606, 4284735, C08G 7310, C08G 6926

Patent

active

054534844

ABSTRACT:
A diamine compound of the general formula ##STR1## wherein the arrows denote isomerism, R.sub.1 is a divalent aromatic group selected from the group consisting of ##STR2## R.sub.2 is a tetravalent aromatic group selected from the group consisting of ##STR3## and R.sub.4 is a monovalent aliphatic group selected from the group consisting of ethyl and isopropyl; and, a process for preparing same.

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T. Kaneda et al., "High-Strength-High Modulus Polyimide Fiber II" Journal of Applied Polymer Sciences, V 32, 3151-3186, 1986, the month of publication is not available.

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