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
Application
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
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)
- [A] US 3964912 A 19760622 - PRICE HARRY J
- [A] US 3826654 A 19740730 - WEISS G, et al
- [A] US 3386824 A 19680604 - ALAN MILLER
- [A] US 4569904 A 19860211 - OKUTSU EIICH [JP], et al
- [A] US 3790383 A 19740205 - SHIMAMURA I, et al
- [A] GB 1182198 A 19700225 - EASTMAN KODAK CO [US]
- [A] PATENT ABSTRACTS OF JAPAN vol. 5, no. 21 (P-48)(693) 7 February 1981 & JP-A-55 149 936 ( FUJI SHASHIN FILM KK ) 21 November 1980
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