Patent
Biphenyltetracarboxylic acid dianhydride and process for producing the same, and polyimide formed from the same and process for producing the same (US Patent 7842824)
Mitsubishi Chemical Corporation · Granted Nov 30, 2010 · Filed Jun 28, 2005
Patent number: 7842824 Kind code: B2 Granted: 2010-11-30 Filed: 2005-06-28 Inventors: Hiroshi Mikami (Kitakyushu, JP); Makoto Nitta (Kitakyushu, JP); Naoki Noguchi (Kitakyushu, JP) Assignees: Mitsubishi Chemical Corporation (Tokyo, JP)
Abstract
To provide a process for producing BPDA whereby high productivity is attained while high purity is maintained. A process for producing biphenyltetracarboxylic acid dianhydride,
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