Photographic direct positive material containing a masked benzot

Details Photographic direct positive material containing a masked benzot Photographic direct positive material containing a masked benzot

1992-07-21

1993-10-19

Baxter, Janet C.

Radiation imagery chemistry: process, composition, or product th

Post imaging processing

430487, 430567, 430598, 430600, 430614, G03C 529, G03C 134

Patent

active

052544435

ABSTRACT:
A photographic direct positive material is disclosed comprising a support and one or more radiation sensitive emulsion layers containing internal latent image-forming silver halide grains characterized in that at least one of said emulsion layers further contains a masked stabilizer corresponding to general formula (I): ##STR1## wherein Z represents a lower alkyl group, a nitro group or a halogen atom, n=0 to 4, and M represents a positive counterion.
Preferred compounds are 1-(2-sulphonatobenzoyl)-5-methyl-benzotriazole, 1-(2-sulphonatobenzoyl)-6-methyl-benzotriazole or a mixture of both.
The masked stabilizer is preferably incorporated in the emulsion layer(s). The material preferably further contains a nucleating agent. Improved direct positive sensitometric properties and wider exposure latitude before encountering rereversal are obtained.

REFERENCES:
patent: 4572892 (1986-02-01), Hoyen

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