Direct positive films

Details Direct positive films Direct positive films

1989-05-05

1990-11-20

Michl, Paul R.

Radiation imagery chemistry: process, composition, or product th

Radiation sensitive product

Silver compound sensitizer containing

430597, 430598, 430600, 430603, 430411, 430412, G03C 1485, G03C 110

Patent

active

049718991

ABSTRACT:
Direct positive photographic films are disclosed having novel density enhancers of the formula ##STR1## wherein A is oxygen or sulfur, and B is selected from the group consisting of hydrogen, alkyl haloalkyl, hydroxyalkyl, alkylamino and alkoxy. Photographic materials coated with emulsions having these density enhancers display good optical density while maintaining high speed capability.

REFERENCES:
patent: 4221863 (1980-09-01), Overman et al.
patent: 4770991 (1988-09-01), Kojima et al.
patent: 4857445 (1989-08-01), Yoshida et al.

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