C - Chemistry – Metallurgy – 09 – B
Patent
C - Chemistry, Metallurgy
09
B
260/178
C09B 29/00 (2006.01)
Patent
CA 1117523
PURIFICATION PROCESS FOR PHOTOGRAPHIC IMAGE-FORMING SULFONAMIDO COMPOUNDS ABSTRACT OF THE DISCLOSURE 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 sulfonamdio compound which is alkali-cleavable upon oxidation to release a diffusible sulfonamido color-providing moiety.
322808
Milner Nigel E.
Payne Christine C.
Eastman Kodak Company
Gowling Lafleur Henderson Llp
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