EP 0699944 B1 20000607 - Tabular grain emulsions with sensitization enhancements
Title (en)
Tabular grain emulsions with sensitization enhancements
Title (de)
Emulsionen aus tafelförmigen Körnern mit verbesserter Empfindlichkeit
Title (fr)
Emulsions aux grains tabulaires à sensibilité améliorée
Publication
Application
Priority
- US 29743094 A 19940826
- US 29656294 A 19940826
- US 29719594 A 19940826
- US 35925194 A 19941219
- US 44149195 A 19950515
Abstract (en)
[origin: EP0699944A1] A chemically and spectrally sensitized tabular grain emulsion is disclosed including tabular grains (a) having ä111ü major faces, (b) containing greater than 70 mole percent bromide and at least 0.25 mole percent iodide, based on silver, (c) accounting for greater than 90 percent of total grain projected area, (d) exhibiting an average equivalent circular diameter of at least 0.7 mu m, and (f) exhibiting an average thickness in the range of from less than 0.3 mu m to at least 0.07 mu m. It has been observed that increased speed, lower granularity, increased contrast and faster rates of development can be realized when (1) the tabular grains contain less than 10 mole percent iodide and (2) the surface chemical sensitization sites include epitaxially deposited silver halide protrusions of a face centered cubic crystal lattice structure of the rock salt type forming epitaxial junctions with the tabular grains, the protrusions (a) being restricted to those portions of the tabular grains located nearest peripheral edges of and accounting for less than 50 percent of the ä111ü major faces of the tabular grains, (b) containing a silver chloride concentration at least 10 mole percent higher than that of the tabular grains, and (c) including at least 1 mole percent iodide.
IPC 1-7
IPC 8 full level
G03C 1/00 (2006.01); G03C 1/005 (2006.01); G03C 1/015 (2006.01); G03C 1/035 (2006.01); G03C 1/12 (2006.01)
CPC (source: EP)
G03C 1/0051 (2013.01)
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
EP 0699944 A1 19960306; EP 0699944 B1 20000607; DE 69517372 D1 20000713; DE 69517372 T2 20010215; JP H08171164 A 19960702
DOCDB simple family (application)
EP 95420233 A 19950821; DE 69517372 T 19950821; JP 21783795 A 19950825