Photographic products and processes
AssigneePolaroid Corporation
InventorHoward G. Rogers
Life of this patent
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Abstract
This invention relates to photographic processes and products for forming an image in dye from a colorless precursor of a preformed image dye which is substituted with a moiety comprising a 1,3-sulfur-nitrogen group that undergoes cleavage in the presence of silver ion and/or soluble silver complex, which moiety maintains said precursor in its colorless form at least until the 1,3-sulfur-nitrogen group undergoes cleavage imagewise to correspond to the imagewise distribution of silver ion and/or soluble silver complex made available as a function of development.
Claims18
A photographic color process which provides a dye image, said process comprising photoexposing a photosensitive element containing a silver halide emulsion, said silver halide emulsion having associated therewith a colorless precursor of a preformed image dye;
- developing said exposed silver halide emulsion to form an image in developed silver and an imagewise distribution of silver ion and/or soluble silver complex in the partially developed and undeveloped areas of said emulsion;
- and forming as a function of said development a color image on dye from said colorless precursor, said colorless precursor of a preformed dye being substituted with a moiety comprising a 1,3-sulfur-nitrogen group that maintains said precursor in its colorless form until said 1,3-sulfur-nitrogen group undergoes cleavage in the presence of said silver ions and/or soluble silver complex formed as a function of development, said 1,3-sulfur-nitrogen group possessing a carbon atom in the 2-position intermediate said sulfur and nitrogen atoms.
A photographic product comprising a photosensitive element comprising a plurality of layers including a support;
- a silver halide emulsion in a layer on said support;
- and in a layer on the same side of said support as said silver halide emulsion, a colorless precursor of a preformed image dye substituted with a moiety comprising a 1,3-sulfur-nitrogen group that undergoes cleavage in the presence of silver ions and/or soluble silver complex, said moiety maintaining said precursor in its colorless form until said 1,3-sulfur-nitrogen group undergoes said cleavage, said 1,3-sulfur-nitrogen group possessing a carbon atom in the 2-position intermediate said sulfur and nitrogen atoms.
Dependencies are inferred from the claim text.