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classificationIPCInventive http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07D307-89
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filingDate 2005-09-28-04:00^^<http://www.w3.org/2001/XMLSchema#date>
inventor http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_d557aea179ca1e8ac1853103aa2ac092
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publicationDate 2006-12-07-04:00^^<http://www.w3.org/2001/XMLSchema#date>
publicationNumber JP-2006328040-A
titleOfInvention Process for producing 2,3,3 ', 4'-biphenyltetracarboxylic dianhydride
abstract An object of the present invention is to provide a method for producing high-purity 2,3,3 ′, 4′-biphenyltetracarboxylic dianhydride (a-BPDA) suitable for polyimide production. SOLUTION: 2,3,3 ′, 4′-biphenyltetracarboxylic acid is dehydrated by heating at 180 to 195 ° C. in an inert gas atmosphere for a time sufficient to complete dehydration. A process for producing a powdery 2,3,3 ′, 4′-biphenyltetracarboxylic dianhydride characterized by the following. [Selection figure] None
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Total number of triples: 41.