High contrast negative image-forming process

Details High contrast negative image-forming process High contrast negative image-forming process

1988-06-30

1990-05-29

Schilling, Richard L.

Radiation imagery chemistry: process, composition, or product th

Silver halide colloid tanning process, composition, or product

430265, 430268, 430448, 430487, 430601, 430949, G03C 106, G03C 524

Patent

active

049295357

ABSTRACT:
This invention is a process of quickly forming high contrast negative images, which are useful for photomechanical process, by development-processing a silver halide photographic material containing a hydrazine derivative in at least one of silver halide emulsion layer(s) and other hydrophilic colloid layer(s) after imagewise exposure in the existence of a compound represented by general formula (A); ##STR1## wherein R.sub.1, R.sub.2 and R.sub.3 each represents an alkyl group, a cycloalkyl group, an aryl group, an alkenyl group, a cycloalkenyl group, or a heterocyclic ring residue, these groups may have a substituent; m represents an integer; L represents an m-valent organic group bonded to the P atom through a carbon atom; n represents an integer of 1 to 3; and X represents an n-valent anion; said X may be bonded to L; using a stable processing solution. Furthermore, the invention is a high contrast negative type silver halide photographic material containing the compound of the above-described general formula (A) in at least one of the silver halide emulsion layer(s) and other hydrophilic colloid layer(s) thereof.

REFERENCES:
patent: 3523023 (1970-08-01), Lowe et al.
patent: 3706562 (1972-12-01), Herz et al.
patent: 4247620 (1981-01-01), Nagatani et al.
patent: 4329417 (1982-05-01), Nagatani et al.
patent: 4569904 (1986-02-01), Okutsu et al.
patent: 4699873 (1987-10-01), Takahashi et al.

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