Polyimide and a method of preparing polyamide from tetracarboxyl

Details Polyimide and a method of preparing polyamide from tetracarboxyl Polyimide and a method of preparing polyamide from tetracarboxyl

1995-03-30

1997-03-25

Seidleck, James J.

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

Synthetic resins

From carboxylic acid or derivative thereof

528 69, 528125, 528128, 528172, 528173, 528179, 528185, 528188, 528220, 528229, 528350, C08G 7310

Patent

active

056146078

ABSTRACT:
The invention provides a method of preparing a polyimide by reacting together a dianhydride and a diisocyanate or equivalent, the polyimide having repeating units of the general formula (I): ##STR1## in which D is a group comprising one or more aromatic rings, to which the imide carbon atoms are directly bonded, and
E is a group comprising one or more cycloaliphatic or aromatic rings, to which the imide nitrogen atoms are bonded directly or via an aliphatic group, provided that the imide nitrogen atoms are not bonded directly to an aromatic ring. Such polyimide is colourless or of low colour.

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