Auxiliary development agents photographic materials incorporatin

Details Auxiliary development agents photographic materials incorporatin Auxiliary development agents photographic materials incorporatin

1999-02-23

1999-10-26

Le, Hoa Van

Radiation imagery chemistry: process, composition, or product th

Nonradiation sensitive image processing compositions or...

Developer

430480, G03C 530

Patent

active

059725842

ABSTRACT:
A class of pyrazolidone compounds suitable for use as electron transfer agents in photographic development comprises pyrazolidones substituted in the 1-position by an aromatic group that is substituted in the ortho, meta or para position by --O--CO--R, wherein R is a monovalent organic group having up to 24 carbon atoms. This ester group is hydrolyzable in an alkaline developer solution, thereby deactivating the electron transfer agents after a period of time and reducing the contamination effect of seasoning into the developer solution. Photographic recording materials can be developed in reactive association with the electron transfer agent. The electron transfer agent can be present in the photographic recording materials, or in develper solutions.

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patent: 5474879 (1995-12-01), Fitterman et al.
patent: 5618652 (1997-04-01), Ueda et al.

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