发明名称 |
Process for preparing quinacridone pigments |
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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申请公布号 |
US6241814(B1) |
申请公布日期 |
2001.06.05 |
申请号 |
US19990351223 |
申请日期 |
1999.07.12 |
申请人 |
CLARIANT GMBH |
发明人 |
URBAN MANFRED;BOEHMER MARTIN;SCHNAITMANN DIETER;WEBER JOACHIM |
分类号 |
C09B67/20;B01F17/32;C09B48/00;C09B67/22;(IPC1-7):C09B48/00;C09B67/10;C09B67/52 |
主分类号 |
C09B67/20 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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