发明名称 |
Purification of photographic image-forming sulfonamido compounds employing immiscible solvents |
摘要 |
A process for purifying a photographic image-forming sulfonamido compound comprises the steps of: a. preparing a first solution by dissolving an unpurified image-forming sulfonamido compound in an aprotic solvent; b. removing impurities from said first solution by, at least once: i. mixing said first solution with an immiscible nonpolar, low-boiling organic solvent to form a mixture of said first solution and a second solution comprising said immiscible nonpolar, low-boiling organic solvent and at least a portion of said impurities; and ii. separating said first solution from said second solution; and c. recovering purified image-forming sulfonamido compound from said first solution. The process is useful in the purification of a nondiffusible sulfonamido compound which is alkali-cleavable upon oxidation to release a diffusible sulfonamido color-providing moiety.
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申请公布号 |
US4228070(A) |
申请公布日期 |
1980.10.14 |
申请号 |
US19790015972 |
申请日期 |
1979.02.28 |
申请人 |
EASTMAN KODAK COMPANY |
发明人 |
MILNER, NIGEL E.;PAYNE, CHRISTINE C. |
分类号 |
C09B29/28;G03C8/10;(IPC1-7):C09B46/00 |
主分类号 |
C09B29/28 |
代理机构 |
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