High purity crystals of biphenyltetracarboxylic dianhydride and

Details High purity crystals of biphenyltetracarboxylic dianhydride and High purity crystals of biphenyltetracarboxylic dianhydride and

1988-06-27

1990-09-18

Kight, III, John

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

Synthetic resins

From carboxylic acid or derivative thereof

528170, 528172, 549241, C08G 6926, C07D30777

Patent

active

049580027

ABSTRACT:
High purity crystals of a biphenyltetracarboxylic dianhydride produced by dehydration of a biphenyltetracarboxylic acid, which contain almost no biphenyltricarboxylic acid or its anhydride, or a small amount such as an amount of not more than 0.2 wt. %, are of value to produce an aromatic polyamic acid or polyimide having an increased high molecular weight. The high purity crystals of a biphenyltetracarboxylic dianhydride can be prepared from a biphenyltetracarboxylic acid by a dehydration process wherein the biphenyltetracarboxylic acid is heated under carefully controlled conditions.

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