US2008214841A1PendingUtilityA1

High-purity biphenyltetracarboxylic dianhydride and process for producing the same

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Assignee: MITSUBISHI CHEM CORPPriority: Mar 13, 2002Filed: Apr 10, 2008Published: Sep 4, 2008
Est. expiryMar 13, 2022(expired)· nominal 20-yr term from priority
Inventors:Hiroshi MikamiTakeshi SanoMakoto Nitta
C07C 63/331C07C 51/42
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Claims

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.

Claims

exact text as granted — not AI-modified
1 . Purified biphenyltetracarboxylic dianhydride containing biphenyltetracarboxylic monoanhydride in an amount of not more than 0.4%. 
     
     
         2 . (canceled) 
     
     
         3 . (canceled) 
     
     
         4 . Biphenyltetracarboxylic dianhydride particles according to  claim 1  having a particle size of 1 to 500 μm. 
     
     
         5 . Biphenyltetracarboxylic dianhydride particles according to  claim 4  having a particle size of 1 to 200 μm.

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