发明授权
- 专利标题： Process for preparing quinacridone pigments
- 专利标题（中）： 制备喹吖啶酮颜料的方法
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申请号： US09351223申请日： 1999-07-12
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公开(公告)号： US06241814B1公开(公告)日： 2001-06-05
- 发明人: Manfred Urban , Martin Boehmer , Dieter Schnaitmann , Joachim Weber
- 申请人： Manfred Urban , Martin Boehmer , Dieter Schnaitmann , Joachim Weber
- 优先权： DE19831097 19980710
- 主分类号： C09B4800
- IPC分类号： C09B4800
摘要：
Linear unsubstituted and substituted quinacridone pigments and quinacridone mixed-crystal pigments are obtained by cyclizing dianilinoterephthalic acid with polyphosphoric acid and then hydrolyzing the ring closure mixture, said mixture being metered into an amount of water or orthophosphoric acid which is such that the final orthophosphoric acid concentration is greater than or equal to 50% by weight in the hedrolysis mixture.
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