Back to results
US 5,328,799 AGranted
Thermographic and photothermographic imaging materials
AssigneePolaroid Corporation
InventorsJames R. Freedman, Stephen R. Sofen, Kent M. Young
Life of this patent
Estimating the term…
Abstract
Photothermographic and thermographic diffusion transfer image-recording materials are provided wherein an auxiliary ligand for silver ions is employed to enhance transfer image density and discrimination.
Claims38
A heat-processed color image-recording material comprising
- (a) a support carrying in one or more layers a dye-providing material capable of releasing a diffusible dye upon cleavage in the presence of silver ions and/or a soluble silver complex, a thermal solvent, an organic silver salt oxidizing material, and a binder and,
- (b) on the same or a second support an image-receiving layer capable of receiving the diffusible dye released from said dye-providing material,
- said image-recording material additionally includes an auxiliary ligand capable of complexing with the silver ions of said silver salt oxidizing material, said ligand dissolving sufficient silver salt oxidizing material to provide a total concentration of mobile silver species greater than or equal to twice the concentration obtained in the absence of the auxiliary ligand.
A method of thermal imaging comprising heating in an imagewise manner a heat-processed image recording material comprising
- (a) a support carrying in one or more layers a dye-providing material capable of releasing a diffusible dye upon cleavage in the presence of silver ions and/or a soluble silver complex, a thermal solvent, a silver salt oxidizing material, and a binder and,
- (b) on the same or a second support an image-receiving layer capable of receiving the diffusible dye released from said dye-providing material,
- said image-recording material additionally includes an auxiliary ligand capable of complexing with the silver ions of said silver salt oxidizing material, said ligand dissolving sufficient silver salt oxidizing material to provide a total concentration of silver species greater than or equal to twice the concentration obtained in the absence of the auxiliary ligand.
A method of photothermographic imaging including the steps of exposing a photosensitive image-recording material comprising
- (a) a support carrying in one or more layers a dye-providing material capable of releasing a diffusible dye upon cleavage in the presence of silver ions and/or a soluble silver complex, a thermal solvent, an organic silver salt oxidizing material, a binder, a photosensitive silver halide, and a reducing agent, and
- (b) on the same or a second support an image-receiving layer capable of receiving the diffusible dye released from said dye-providing material,
- said image-recording material additionally includes an auxiliary ligand capable of complexing with the silver ions of said silver salt oxidizing material, said ligand dissolving sufficient silver salt oxidizing material to provide a total concentration of mobile silver species greater than or equal to twice the concentration obtained in the absence of the auxiliary ligand,
- and either simultaneously with exposure or subsequently to exposure heating said photosensitive material.
1 more element
A heat-processed color image-recording material comprising:
- (a) a support carrying in one or more layers a dye-providing material capable of releasing a diffusible dye upon cleavage in the presence of silver ions and/or a soluble silver complex, a thermal solvent, a silver salt oxidizing material, a binder;
- and
- (b) on the same or a second support an image-receiving layer capable of receiving diffusible dye released from said dye-providing material,
- said image-recording layer additionally includes an auxiliary ligand capable of complexing with silver ions of said silver salt oxidizing material, said ligand dissolving sufficient silver salt oxidizing material to provide a total concentration of mobile silver species greater than or equal to twice the concentration obtained in the absence of said auxiliary ligand;
- and said thermal solvent and said auxiliary ligand consisting of the same material.
2 more elements
A method of photothermographic imaging including the steps of exposing a photosensitive image-recording material comprising:
- (a) a support carrying in one or more layers a dye-providing material capable of releasing a diffusible dye upon cleavage in the presence of silver ions and/or a soluble silver complex, a thermal solvent, a silver salt oxidizing material, a binder, a photosensitive silver halide, and a reducing agent;
- and
- (b) on the same or a second support an image-receiving layer capable of receiving diffusible dye released from said dye-providing material,
- said image-recording layer additionally includes an auxiliary ligand capable of complexing with silver ions of said silver salt oxidizing material, said ligand dissolving sufficient silver salt oxidizing material to provide a total concentration of mobile silver species greater than or equal to twice the concentration obtained in the absence of said auxiliary ligand,
- said thermal solvent and said auxiliary ligand consisting of the same material;
- and either simultaneously with exposure or subsequently to exposure heating said photosensitive material.
3 more elements
Dependencies are inferred from the claim text.