EP 0738919 A3 19970115 - Stabilised peroxide bleaching solutions and their use for processing of photographic elements
Title (en)
Stabilised peroxide bleaching solutions and their use for processing of photographic elements
Title (de)
Stabilisierte Peroxid-Bleichlösungen und deren Verwendung zur Verarbeitung von photographischen Elementen
Title (fr)
Solutions de blanchiment à base de peroxyde stabilisées et leur utilisation pour le traitement d'éléments photographiques
Publication
Application
Priority
- US 42246895 A 19950417
- US 42325795 A 19950417
Abstract (en)
[origin: EP0738919A2] Color photographic elements are bleached after exposure and development by using a hydrogen peroxide bleaching solution. This solution comprises a hydrogen peroxide bleaching agent, chloride ions in an amount of at least 0.35 mol/l, a first acidic compound which is an organic phosphonic acid or a salt thereof, and a second acidic compound which is either a 2-pyridinecarboxylic acid or 2,6-pyridinedicarboxylic acid (or a salt thereof), or a polyaminocarboxylic acid having one or more secondary amines at a pH of 8 to 11 (or a salt thereof). The bleaching solution is stabilized by the presence of the two acidic compounds. <IMAGE>
IPC 1-7
IPC 8 full level
G03C 7/00 (2006.01); C11D 7/54 (2006.01); G03C 7/42 (2006.01)
CPC (source: EP)
G03C 7/421 (2013.01); G03C 7/42 (2013.01)
Citation (search report)
- [DA] EP 0428101 A1 19910522 - FUJI PHOTO FILM CO LTD [JP]
- [A] DATABASE WPI Week 9303, Derwent World Patents Index; AN 93-022251, XP002017618
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
EP 0738919 A2 19961023; EP 0738919 A3 19970115; EP 0738919 B1 19981230; DE 69601244 D1 19990211; DE 69601244 T2 19990708; JP H08292534 A 19961105
DOCDB simple family (application)
EP 96200947 A 19960415; DE 69601244 T 19960415; JP 9437196 A 19960416