发明授权
US5078794A Process for preparing 4,4'-diamino-1,1'-dianthraquinonyl pigments
失效
制备4,4'-二氨基-1,1'-二氨基乙酸染料的方法
- 专利标题： Process for preparing 4,4'-diamino-1,1'-dianthraquinonyl pigments
- 专利标题（中）： 制备4,4'-二氨基-1,1'-二氨基乙酸染料的方法
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申请号： US573522申请日： 1990-08-27
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公开(公告)号： US5078794A公开(公告)日： 1992-01-07
- 发明人: Detlef-Ingo Schutze , Werner Steinbeck , Anton Adams
- 申请人： Detlef-Ingo Schutze , Werner Steinbeck , Anton Adams
- 申请人地址： DEX Leverkusen
- 专利权人： Bayer Aktiengesellschaft
- 当前专利权人： Bayer Aktiengesellschaft
- 当前专利权人地址： DEX Leverkusen
- 优先权： DEX3718519 19870603; DEX3800683 19880113
- 主分类号： C09B1/16
- IPC分类号： C09B1/16 ; B01F17/08 ; C09B1/00 ; C09B67/14
摘要：
Process for preparing 4,4'-diamino-1,1'-dianthraquinonyl pigments by desulphonation of 4,4'-diamino-1,1'-dianthraquinonyl-3,3'-disulphonic acid in sulphuric acid, characterized in that after the desulphonation water is added to the sulphuric acid solution, 4,4'-diamino 1,1'-dianthraquinonyl is isolated as sulphate, the sulphate is hydrolysed, if necessary by redissolving it in sulphuric acid and adding the solution to water, and the pigment is isolated, if necessary, after treatment with an organic solvent.
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