发明名称 |
Process for preparing purified dyestuffs |
摘要 |
<p>The invention relates to a process for the preparation of a purified version of a solvent-soluble dyestuff, comprising the steps of (a) mixing an aqueous presscake of the dyestuff into a water-miscible liquid; and (b) distilling off the water until a water content of 5 % by weight maximum is attained; and (c) filtering the dyestuff composition comprising solvent-soluble dyestuff and water-miscible liquid, thereby removing all insoluble contaminants and (d) diluting the dyestuff composition comprising solvent-soluble dyestuff and water-miscible organic solvent in de-ionized water, thereby performing the precipitation of the solvent-soluble dyestuff which is then isolated after filtration and washing with de-ionized water. This ink jet grade version has the important advantage of being virtually salt-free and solvent-free.</p> |
申请公布号 |
EP1057874(A2) |
申请公布日期 |
2000.12.06 |
申请号 |
EP20000810473 |
申请日期 |
2000.05.30 |
申请人 |
CLARIANT FINANCE (BVI) LIMITED |
发明人 |
PFLIEGER, DOMINIQUE;MACHOLDT, HANS TOBIAS |
分类号 |
B41M5/00;C09B67/48;C09B67/54;C09D11/00;(IPC1-7):C09B67/54;C09B67/44 |
主分类号 |
B41M5/00 |
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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