发明授权
- 专利标题： Process for the preparation of concentrated dyestuff solutions
- 专利标题（中）： 浓缩染料溶液的制备方法
-
申请号： US626477申请日： 1975-10-28
-
公开(公告)号： US4163012A公开(公告)日： 1979-07-31
- 发明人: Erich Kramer , Horst Nickel , Fritz Puchner
- 申请人： Erich Kramer , Horst Nickel , Fritz Puchner
- 申请人地址： DE Leverkusen
- 专利权人： Bayer Aktiengesellschaft
- 当前专利权人： Bayer Aktiengesellschaft
- 当前专利权人地址： DE Leverkusen
- 优先权： DE2451257 19741029
- 主分类号： C09B41/00
- IPC分类号： C09B41/00 ; C09B67/44 ; C09B67/54 ; D21H21/28 ; C09B35/16
摘要：
The invention relates to the preparation of concentrated solutions of azo dyestuffs containing ionic groups, by precipitating during the diazotization and/or coupling reaction and/or after the coupling reaction the foreign ions which lower the solubility of the dyestuffs and separating off these ions as sparingly soluble salts.In this way dyestuff solutions which are stable to storage at room temperature and have a dyestuff content of 10 to 50 percent by weight are obtained.
公开/授权文献
- US5765594A Hydraulic control valve 公开/授权日：1998-06-16
信息查询
