Method for forming a direct positive image

Details Method for forming a direct positive image Method for forming a direct positive image

1990-06-21

1991-02-26

Michl, Paul R.

Radiation imagery chemistry: process, composition, or product th

Color imaging process

Using identified radiation sensitive composition in the...

430406, 430409, 430410, 430547, 430567, 430598, G03C 524

Patent

active

049961373

ABSTRACT:
A method for forming a direct positive image composed of the step of developing with a surface developer an imagewise exposed photosensitive material compose of support having thereon at least one photosensitive emulsion layer containing unprefogged silver halide grains capable of forming an internal latent image; the at least the photosensitive emulsion layer composed of hexagonal tabular silver halide grains in an amount of at least 30 wt %, based on the total silver amount of silver halide grains therein; the hexagonal tabular grains having two parallel hexagonal faces, the ratio of the longest side to the shortest side of the hexagon being at most 2; the aspect ratio of the hexagonal tabular grains being from 2 to 8; and the hexagonal tabular grains having a monodisperse size distribution. The method provides increases in processing speed, maximum density, and contrast in the toe portion, and an improvement in graininess, even when exhausted processing solutions are used.

REFERENCES:
patent: 3935014 (1976-01-01), Klotzer et al.
patent: 4594317 (1986-06-01), Sasaki et al.
patent: 4789627 (1988-12-01), Inone et al.
patent: 4797354 (1989-01-01), Saiton et al.

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