发明名称 |
Method for preparing an acid salt of p-phenylenediamine-type photographic color developers |
摘要 |
A process for purifying p-phenylenediamine color developers in their free-base form. The process includes subjecting a solution containing p-phenylenediamine-type free base color developer to short path distillation which includes at least one of falling film evaporator, thin film evaporator, wiped film evaporator, or short-path evaporator.Another aspect is a method for preparing an acid salt from a p-phenylenediamine free base color developer. The method includes the steps of: a) dissolving a purified p-phenylenediamine free base derived from the short path distillation process in an organic solvent; b) contacting the dissolved free base distillate with an appropriate mineral acid; and c) crystallizing the color developer in the acid salt form.
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申请公布号 |
US6623914(B2) |
申请公布日期 |
2003.09.23 |
申请号 |
US20020235969 |
申请日期 |
2002.09.05 |
申请人 |
EASTMAN CHEMICAL COMPANY |
发明人 |
BOLDEA LUCIAN;HUDNALL PHILLIP MONTGOMERY |
分类号 |
C07C209/84;C07C211/51;C07C213/10;C07C215/16;C07C303/44;C07C311/05;G03C7/413;(IPC1-7):G03C7/413 |
主分类号 |
C07C209/84 |
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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