Process of hardening protein-containing photographic layers with a mixture of a carboxyl group-activating, low molecular weight compound and a carboxyl group-activating polymer
AssigneeAgfa-Gevaert
InventorsWalter Frans De Winter, Daniel Maurice Timmerman
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Abstract
A process is described for the hardening of a protein-aceous layer or layers, more especially of gelatin layers, e.g. gelatin layers in a photographic material, by the application on this layer or layers of a coating composition comprising a low molecular weight, fast-acting, carboxyl group-activating hardening agent in combination with a film-forming, hydrophilic, polymeric, fast-acting hardening agent carrying one or more carboxyl group-activating substituents.
Claims11
A process for treating silver halide photographic materials which include a protein-containing layer to harden such layer which comprises the step of applying over such layer a layer comprising a mixture of a low molecular weight, fast-acting, carboxyl group-activating hardening agent with a larger amount of a film-forming, hydrophilic, polymeric, fast-acting hardening agent carrying at least one carboxyl group-activating carbodiimide substituent, said low molecular weight hardening agent being selected from the group consisting of carbamoylpyridinium salts, carbamoyloxypyridinium salts, isoxazolium salts, dihydroquinoline compounds, and carbodiimides.
A process according to claim 7, wherein the polymeric, fast-acting hardening agent corresponds to the structural formula:
- ##STR39## wherein x, y, z, and w are 26.2, 52.6, 7.2, and 14.0 mole % respectively.
A silver halide photographic material containing at least one protein-containing layer and a superposed contacting layer comprising a mixture of a low molecular weight, fast-acting, carboxyl group-activating hardening agent with a larger amount of a film-forming, hydrophilic, polymeric, fast-acting hardening agent carrying at least one carboxyl group-activating carbodiimide substituent, said low molecular weight hardening agent being selected from the group consisting of carbamoylpyridinium salts, carbamoyloxypyridinium salts, isoxazolium salts, dihydroquinoline compounds, and carbodiimides.
Dependencies are inferred from the claim text.