Direct positive silver halide emulsion and color diffusion trans

Details Direct positive silver halide emulsion and color diffusion trans Direct positive silver halide emulsion and color diffusion trans

1993-08-10

1995-05-30

Schilling, Richard L.

Radiation imagery chemistry: process, composition, or product th

Radiation sensitive product

Identified radiation sensitive composition with color...

430217, 430569, 430599, 430600, 430603, 430627, 430628, 430629, 430630, G03C 1053, G03C 1485, G03C 810

Patent

active

054200040

ABSTRACT:
An internal latent image type positive silver halide emulsion has improved sensitivity reduction in low illuminance exposures. A color diffusion transfer light-sensitive material incorporates the emulsion and has reduced sensitivity reduction. The internal latent image type positive silver halide emulsion is prepared using a polymer having a repetitive unit derived from an ethylenically unsaturated monomer having at least one thioether structure on a side chain as a deflocculating agent to form silver halide grains and subjecting the grain surfaces to a chemical sensitization in the presence of a polymer having a repetitive unit represented by the following Formula (I): ##STR1## wherein R.sup.1 represents a hydrogen atom or a substituted or unsubstituted alkyl group and Q represents a group selected from the group consisting of groups represented by the following Formula (1) to Formula (4): ##STR2## wherein q represents an integer of 2 to 4; ##STR3## wherein R.sup.2 and R.sup.3 each independently represents a hydrogen atom or a substituted or unsubstituted alkyl group; ##STR4## wherein Z.sup.1 represents a group of atoms necessary to form a substituted or unsubstituted lactam ring, a substituted or unsubstituted oxazolidone ring, or a substituted or unsubstituted pyridone ring; and A represents a single bond, a --C(.dbd.O)-- group, or a group represented by the following Formula (3a): ##STR5## wherein B represents an --O-- group or an --N(R.sup.4)-- group, in which R.sup.4 represents a hydrogen atom or a substituted or unsubstituted alkyl group; and k represents an integer of 1 to 6; ##STR6## wherein A has the same meaning as A in the above Formula (3); D represents a single bond, an --O-- group or an --N(R.sup.5)-- group; m and n each represents an integer of 1 to 6, which satisfy the relationship of m+n.dbd.4 to 7, in which R.sup.5 represents a hydrogen atom, a substituted or unsubstituted alkyl group, or a group represented by the following Formula (4a): ##STR7## wherein R.sup.6 represents a substituted or unsubstituted alkyl group.

REFERENCES:
patent: 3615624 (1971-10-01), Smith et al.
patent: 3690888 (1972-09-01), Bacon et al.
patent: 3860428 (1975-01-01), Ponticello et al.
patent: 4400463 (1983-08-01), Maskasky
patent: 4431730 (1984-02-01), Urabe et al.
patent: 4431731 (1984-02-01), Sugimoto et al.

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