High chloride emulsion having high sensitivity and low fog
US6740482B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 22, 1994 |
| Grant date | May 25, 2004 |
| Priority date | — |
| Expiry date | Dec 22, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C1/346
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The invention provides a radiation sensitive emulsion comprised of a dispersing medium and silver iodochloride grainsWHEREIN the silver iodochloride grainsare partially bounded by {100} crystal faces satisfying the relative orientation and spacing of cubic grains andcontain from 0.05 to 1 mole percent iodide, based on total silver, with maximum iodide concentrations located nearer the surface of the grains than their centerand wherein said emulsion further comprises a thiosulfonate of Formula I and a sulfinate of Formula IIwherein Formula I isZ1SO2SM1  (I)whereinZ1 is alkyl, aryl, heteroaryl, arylalkyl, substituted aryl or a polymeric backbone wherein the thiosulfonate group is repeated andM1 is a monovalent metal or a tetraalkylammonium cation, andFormula II isZ2SO2M2  (II)whereinZ2 is alkyl, aryl, heteroaryl, arylalkyl, substituted aryl or a polymeric backbone wherein the sulfinate group is repeated andM2 is a monovalent metal or a tetraalkylammonium cation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.