Back to results
US 4,543,324 AGranted
Process for hardening photographic gelatin with vinyl sulfones containing sulfonyl ethyl sulfate groups
AssigneeAgfa-Gevaert
InventorWolgang Himmelmann
Life of this patent
Estimating the term…
Abstract
The difficulties in the casting process of photographic gelatin containing layers caused by increases in the viscosity of the casting solution due to the premature cross-linking of gelatin can be prevented if a compound containing at least one vinyl sulfone group and at least one sulfonyl ethyl sulfate group in the form of their salts is incorporated in the casting composition of the gelatin-containing layer(s) or in the gelatin-containing layer(s) applied to the layer support.
Claims4
A process of hardening a photographic material consisting of a layer support and at least one gelatin-containing layer applied to this support,
- comprising incorporating in the casting composition of a gelatin-containing layer applied to the layer support or in a gelatin-containing layer applied to the layer support
- a cross-linking agent which is reactive with the amino groups of the gelatin
- wherein the cross-linking agent is a compound containing at least one sulfone group and at least one vinyl sulfonyl ethylsulfate group as a water-solubilizing group in the form of their salts
- and wherein the cross-linking activity of the compound with the gelatin is carried out after drying said gelatin-containing layer and at a Ph value of from 6 to 7.
1 more element
Dependencies are inferred from the claim text.