Global Patent Index - EP 1191395 A1

EP 1191395 A1 20020327 - Ascorbic acid developing compositions and methods of use

Title (en)

Ascorbic acid developing compositions and methods of use

Title (de)

Ascorbinsäureentwicklerzusammensetzungen und Verfahren zu ihrer Verwendung

Title (fr)

Compositions de développement photographique à l'acide ascorbique et leurs procédés d'utilisation

Publication

EP 1191395 A1 20020327 (EN)

Application

EP 01203043 A 20010809

Priority

US 64305600 A 20000821

Abstract (en)

A black-and-white photographic developing composition has improved stability and is more compatible with the environment when discarded. The composition includes one or more ascorbic acid developing agents and is essentially free of hydroquinone and similar derivatives. It comprises a sulfur-containing compound represented by one of the following Structures I, II, III and IV: M1S-R-CH(NH2)-COOM2 M1S-R1-COOM2 R2-S-S-R2 R3HN-R4-SM1 wherein R is a divalent aliphatic linking group having at least 1 carbon atom in the chain, R1 is phenylene or an unsubstituted alkylene having 1 or 2 carbon atoms, R2 is a monovalent aliphatic group having at least 2 carbon atoms and comprising a -CH(NHR3)-COOM2 or -(C1-C3)alkylene-CH(NHR3)-COOM2 group, R3 is hydrogen, an alkyl group having 1 to 3 carbon atoms or phenyl, R4 is an alkylene group, a cyclohexylene group, or a phenylene group, and M1 and M2 are independently hydrogen, an alkali metal or ammonium ion or methyl group. <IMAGE>

IPC 1-7

G03C 5/305

IPC 8 full level

G03C 5/30 (2006.01); G03C 5/305 (2006.01); G03C 5/26 (2006.01)

CPC (source: EP)

G03C 5/305 (2013.01); G03C 1/34 (2013.01); G03C 5/26 (2013.01); G03C 5/264 (2013.01); G03C 5/30 (2013.01); G03C 5/3035 (2013.01); G03C 2005/3007 (2013.01); G03C 2200/52 (2013.01)

Citation (search report)

Designated contracting state (EPC)

DE FR GB

DOCDB simple family (publication)

EP 1191395 A1 20020327; JP 2002072425 A 20020312

DOCDB simple family (application)

EP 01203043 A 20010809; JP 2001250196 A 20010821