High-purity biphenyltetracarboxylic dianhydride and process...

Details High-purity biphenyltetracarboxylic dianhydride and process... High-purity biphenyltetracarboxylic dianhydride and process...

2004-01-09

2008-12-02

Keys, Rosalynd (Department: 1621)

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C549S239000

Reexamination Certificate

active

07459570

ABSTRACT:
There is provided biphenyltetracarboxylic dianhydride containing biphenyltetracarboxylic monoanhydride in an amount of not more than 0.4%. By using the biphenyltetracarboxylic dianhydride as a raw material, it is possible to produce polyimide or polyamic acid having an increased molecular weight.

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Richard J. Lewis, Sr., Hawley's Condensed Chemical Dictionary, twelfth edition, 1993, pp. 300, 301, 960 and 961.

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