发明授权
- 专利标题： Biphenyltetracarboxylic acid dianhydride and process for producing the same, and polyimide formed from the same and process for producing the same
- 专利标题（中）： 联苯四羧酸二酐及其制造方法，以及由其制造的聚酰亚胺及其制造方法
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申请号： US11570812申请日： 2005-06-28
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公开(公告)号： US07842824B2公开(公告)日： 2010-11-30
- 发明人: Hiroshi Mikami , Makoto Nitta , Naoki Noguchi
- 申请人： Hiroshi Mikami , Makoto Nitta , Naoki Noguchi
- 申请人地址： JP Tokyo
- 专利权人： Mitsubishi Chemical Corporation
- 当前专利权人： Mitsubishi Chemical Corporation
- 当前专利权人地址： JP Tokyo
- 代理机构： Oblon, Spivak, McClelland, Maier & Neustadt, L.L.P.
- 优先权： JP2004-189465 20040628
- 国际申请： PCT/JP2005/011812 WO 20050628
- 国际公布： WO2006/001443 WO 20060105
- 主分类号： C07D307/89
- IPC分类号： C07D307/89 ; C08G69/32
摘要：
To provide a process for producing BPDA whereby high productivity is attained while high purity is maintained.A process for producing biphenyltetracarboxylic acid dianhydride, which comprises heating biphenyltetracarboxylic acid to produce biphenyltetracarboxylic acid dianhydride, characterized in that the heating is carried out at a pressure of from 1×102 Pa to 1.1×105 Pa to a maximum temperature in a range of from 210° C. to 250° C. in such a manner that the temperature rising rate is higher than 50° C./hr for a period of at least ¼ of the time for the temperature rise from 60° C. to 210° C., and the temperature is maintained to be from 150° C. to 250° C. for from 0.5 to 10 hours.
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