US 5,175,073 A · Nucleated contact film for use in graphic arts

Abstract

A high-contrast room-light-handleable black-and-white silver halide photographic film especially adapted for use as a dry-dot-etchable contact film in the graphic arts is comprised of a support having in order on one side thereof (1) a radiation-sensitive layer comprising silver halide grains, a hydrophilic colloid and a polymer latex, (2) an interlayer comprising a hydrophilic colloid and a polymer latex, and (3) an overcoat layer comprising a hydrophilic colloid, a matting agent and a light-scattering agent, wherein the interlayer has a refractive index in the range of from about 1.4 to about 1.7 and a thickness which is in the range of from about 0.5 to about 5 microns and is at least twice that of the overcoat layer, and wherein the film contains in the radiation-sensitive layer, or a layer contiguous thereto, a hydrazine compound which functions as a nucleating agent. The combination of the light-scattering agent in the overcoat layer and the thick interlayer facilitates optical spreading of the image during contact exposure, and thereby enhances the performance of the contact film in use with multi-layer originals and in processes of dry dot etching. Futher improvement in performance is provided by the hydrazine compound which provides chemical image spread to supplement the optical image spread.

Claims17

Dependent claims

A high-contrast room-light-handleable black-and-white silver halide photographic film which is especially adapted for use as a dry-dot-etchable contact film in the graphic arts by its ability to provide both optical spread and chemical spread;

said film comprising a support having in order on one side thereof:
(1) a radiation-sensitive layer comprising silver halide grains, a hydrophilic colloid and a polymer latex,
(2) an interlayer consisting essentially of a hydrophilic colloid and a polymer latex, and
(3) an overcoat layer consisting essentially of a hydrophilic colloid, a matting agent having an average particle size in the range of from about 1 to about 5 microns and a light-scattering agent having an average particle size in the range of from about 0.1 to about 5 microns;
said interlayer having a refractive index in the range of from aobut 1.4 to about 1.7 and a thickness which is at least twice that of said overcoat layer and is in the range of from about 0.5 to about 5 microns;
said film additionally comprising an effective amount of a hydrazine compound which functions as a nucleating agent and is present in said radiation-sensitive layer or a layer contiguous thereto.

3 more elements

said film comprising a support having in order on one side thereof:
(1) a radiation-sensitive layer comprising gelatin, a hydrazine compound which functions as a nucleating agent, a polymer latex and silver halide grains doped with a doping agent in an amount sufficient to provide a level of photosensitivity which permits room-light-handling of said film, said doping agent being a transition metal coordination complex of the formula:
[M(NX)(L).sub.5 ].sub.n
wherein M is a ruthenium, rhenium, chromium, osmium or iridium transition metal,
X is oxygen or sulfur,
L is a ligand, and
n is -1, -2, or -3;
and said radiation-sensitive layer having a thickness in the range of from aobut 2 to about 4 microns;
(2) an interlayer consisting essentially of gelatin, and a polymer latex and having a refractive index in the range of from about 1.55 to about 1.65 and a thickness of about 1 micron;
and
(3) an overcoat layer consisting essentially of gelatin, a matting agent having an average particle size in the range of from about 1 to about 5 microns and a light-scattering agent having an average particle size in the range of from about 0.1 to about 5 microns, said overcoat layer having a thickness of about 0.4 microns.

8 more elements

Dependencies are inferred from the claim text.

Nucleated contact film for use in graphic arts

Life of this patent

Nucleated contact film for use in graphic arts

Life of this patent

Abstract

Claims17