Hardeners for photographic materials

Details Hardeners for photographic materials Hardeners for photographic materials

1998-05-01

2000-02-22

Davis, Zinna Northington

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

546330, C07D21170

Patent

active

060281995

ABSTRACT:
Hardeners for photographic materials, the binders of which substantially consist of gelatine, wherein the hardeners are carbamoylpyridinium salts, the amine components of which are derived from secondary amines, which amines are converted into photographically inert products by an intramolecular cyclisation reaction, improve photographic properties, even when the material is stored under extreme conditions.

REFERENCES:
patent: 3880665 (1975-04-01), Himmelmann et al.
patent: 4063952 (1977-12-01), Himmelmann et al.
patent: 4865940 (1989-09-01), Schranz et al.
patent: 5229260 (1993-07-01), Takamuki et al.

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