EP 0949536 A1 19991013 - Light-sensitive emulsion having (100) tabular grains rich in silver chloride and method for preparing said grains
Title (en)
Light-sensitive emulsion having (100) tabular grains rich in silver chloride and method for preparing said grains
Title (de)
Lichtempfindliche Emulsion, die chloridreiche (100)-Tafelkörner enthält und Verfahren zur Herstellung dieser Körner
Title (fr)
Emulsion sensible à la lumière ayant des grains tabulaires (100) riche en chlorure et procédé pour préparer les mêmes
Publication
Application
Priority
EP 98201093 A 19980407
Abstract (en)
A light-sensitive silver halide photographic emulsion has been described, said emulsion comprising a colloidally stabilizing binder and ä100ü tabular silver halide grains containing at least 50 mole % of silver chloride, wherein at least 70 % by number of all grains is provided by said tabular grains, exhibiting an average aspect ratio of at least 5 and an average equivalent circular grain diameter of at least 0.3 mu m, wherein said tabular grains have an average thickness of less than 0.25 mu m for at least 75 % by number of all tabular grains. In order to prepare said emulsion a method has been disclosed comprising performing at least three distinct precipitation steps in an aqueous medium in a reaction vessel, followed by desalting by means of washing after flocculation or by means of ultrafiltration, wherein said three distinct precipitation steps consist of a nucleation step followed by a first and a second growth step, said method being further characterized by introducing in the said reaction vessel, after the first growth step, of a block-copolymer according to the formula (I) as described in the detailed description and in the claims.
IPC 1-7
IPC 8 full level
G03C 1/015 (2006.01); G03C 1/005 (2006.01); G03C 1/025 (2006.01); G03C 1/035 (2006.01); G03C 1/04 (2006.01); G03C 1/46 (2006.01); G03C 5/16 (2006.01)
CPC (source: EP)
G03C 1/0053 (2013.01); G03C 1/46 (2013.01); G03C 5/16 (2013.01); G03C 2200/01 (2013.01)
Citation (search report)
- [Y] US 5707793 A 19980113 - OYAMADA TAKAYOSHI [JP]
- [Y] EP 0518066 A1 19921216 - EASTMAN KODAK CO [US]
- [Y] EP 0762192 A1 19970312 - KONISHIROKU PHOTO IND [JP]
- [A] EP 0672940 A2 19950920 - EASTMAN KODAK CO [US] & US 5413904 A 19950509 - CHANG YUN C [US], et al
Designated contracting state (EPC)
BE DE FR GB
DOCDB simple family (publication)
DOCDB simple family (application)
EP 98201093 A 19980407; JP 9722399 A 19990405