Global Patent Index - EP 0531582 A1

EP 0531582 A1 19930317 - Stabilized ascorbic acid developer.

Title (en)

Stabilized ascorbic acid developer.

Title (de)

Stabilisierte Ascorbinsäureentwicklerlösung.

Title (fr)

Développateur stabilisé de l'acide ascorbique.

Publication

EP 0531582 A1 19930317 (EN)

Application

EP 91202333 A 19910912

Priority

EP 91202333 A 19910912

Abstract (en)

A silver halide developing solution is provided characterized by a pH of at least 12.0 and containing : (a) a sugar derivative or an alkali metal salt thereof, present in a concentration of more than 0.4 mole/liter and corresponding to following general formula (I) : <CHEM> wherein X represents an oxygen atom or an imino group, and n represents a positive integer from 1 to 4, and R represents a hydroxy group when n is 1, and R represents a hydroxy group or a hydrogen atom when n is 2 to 4. (b) a compound corresponding to general formula (II), or an alkali metal salt thereof : <CHEM> wherein Z represents the necessary atoms to form a benzocondensed ring, m = 0 or 1, and n = 1, 2 or 3. Preferred sugar derivatives corresponding to general formula (I) are l-ascorbic acid and iso-ascorbic acid. A preferred compound according to general formula (II) is salicylic acid.

IPC 1-7

G03C 5/30; G03C 5/305

IPC 8 full level

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

CPC (source: EP)

G03C 5/30 (2013.01); G03C 5/305 (2013.01)

Citation (search report)

Designated contracting state (EPC)

BE DE FR GB NL

DOCDB simple family (publication)

EP 0531582 A1 19930317; EP 0531582 B1 19970115; DE 69124237 D1 19970227; DE 69124237 T2 19970626; JP H05210220 A 19930820

DOCDB simple family (application)

EP 91202333 A 19910912; DE 69124237 T 19910912; JP 26934892 A 19920910