Iodochloride emulsions containing iodonium salts having high sensitivity and low fog
US5605789A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 22, 1994 |
| Grant date | Feb 25, 1997 |
| Priority date | — |
| Expiry date | Dec 22, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C1/34
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The invention provides a radiation sensitive emulsion comprised of a dispersing medium and silver iodochloride grains PA1 WHEREIN the silver iodochloride grains PA2 are partially bounded by {100} crystal faces satisfying the relative orientation and spacing of cubic grains and PA2 contain 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 center PA1 and wherein said emulsion further comprises an iodonium salt represented by formula (I) [R.sub.1 I.sup.+ R.sub.2 ] Q.sup.- PA1 wherein R.sub.1, R.sub.2, may be independently substituted or non-substituted alkyl, aryl, alkylaryl, but not oxygen, or together R.sub.1 and R.sub.2 may form carbocyclic, heterocyclic, aromatic, or heteroaromatic rings and Q is an anion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.