Direct positive image forming method

Details Direct positive image forming method Direct positive image forming method

1989-08-15

1991-02-19

Michl, Paul R.

Radiation imagery chemistry: process, composition, or product th

Radiation sensitive product

Silver compound sensitizer containing

430264, 430379, 430409, 430410, 430411, 430596, 430611, 430613, 430940, G03C 550

Patent

active

049943642

ABSTRACT:
A direct positive image forming method comprising development processing an imagewise exposed direct positive photographic light-sensitive material which comprises a support having thereon at least one layer containing internal latent image type silver halide grains not having been previously fogged after fogging treatment or while fogging treatment, wherein the fogging treatment is conducted in the presence of a compound represented by the following general formula (I): ##STR1## wherein A.sub.1 and A.sub.2 both represent a hydrogen atom or one of A.sub.1 and A.sub.2 represents a hydrogen atom and the other represents a sulfonyl group or an acyl group; G.sub.1 represents a carbonyl group, a sulfonyl group, a sulfoxy group, ##STR2## or an iminomethylene group; L.sub.1 represents a divalent linkage group; X.sub.1 represents --O-- or ##STR3## wherein R.sub.4 represents a hydrogen atom, an alkyl group or an aryl group); Y.sub.1 represents ##STR4## R.sub.1 and R.sub.2 each represents an aliphatic group, an aromatic group, a heterocyclic group, --OR.sub.5 or --NR.sub.5 R.sub.6 (wherein R.sub.5 represents an aliphatic group, an aromatic group or a heterocyclic group; and R.sub.6 represents a hydrogen atom, an aliphatic group, an aromatic group or a heterocyclic group); and R.sub.3 represents a hydrogen atom, an alkyl group, an aryl group, an alkoxy group, an aralkyl group, an aryloxy group or an amino group.
In accordance with the method of the present invention direct positive images having a high maximum image density and a low minimum image density and being stable even when preserved under high temperature and high humidity conditions.

REFERENCES:
patent: 4835091 (1989-05-01), Inoue et al.

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