Method for producing silver salt of organic acid and photothermographic material utilizing the same
US6630293B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 20, 2000 |
| Grant date | Oct 7, 2003 |
| Priority date | — |
| Expiry date | Oct 20, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C1/49809
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A method for producing a silver salt of an organic acid, which comprises steps of reacting (1) a solution containing silver ions in water or in a mixture of an organic solvent and water, with (2) a solution or suspension containing an alkali metal salt of an organic acid in water, in a mixture of an organic solvent and water, or in an organic solvent to prepare a silver salt of an organic acid, and removing a byproduct salt by a desalting operation, wherein a dispersing agent having a molecular weight of 3000 or less is added and dispersed during a time period of from before the reaction to before the desalting operation. There is provided a method for producing a silver salt of an organic acid, which can provides low fog, high sensitivity and high concentration of blackening when it is used for photothermographic materials, and is suitable for the production of photothermographic materials having low haze and less image degradation after storage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.