Imageable articles having dye selective interlayers
AssigneeMinnesota Mining and Manufacturing Company
InventorsGlenn S. Prementine, Takuzo Ishida
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Abstract
The use of copolymers of vinylidene chloride and vinyl pyrrolidone as selective diffusion media in dye-diffusive photothermographic imaging constructions is disclosed. Unoxidized phenolic leuco dye molecules diffuse into a film of these copolyers but do not readily diffuse out. In contrast, their oxidized dye forms, which are quinoidal in nature, readily diffuse through these interlayers resulting in improved image stability and color separation.
Claims14
An imageable article comprising:
- (a) an image-forming layer comprising a light-insensitive, reducible silver source;
- a light-sensitive silver halide;
- a polymeric binder;
- a sensitizer;
- and a phenolic leuco dye which generates a quinoidal dye upon oxidation;
- (b) an image-receiving layer, and (c) a polymeric interlayer interposed between said image-forming and image-receiving layers, said polymeric interlayer comprising a vinyl pyrrolidone-vinylidene chloride copoylmer.
A dry silver photothermographic element comprising a substrate coated on one side thereof with an image-receiving layer, said image-receiving layer having coated thereon at least one image-forming layer separated from said image receiving layer by a polymeric interlayer, said polymeric interlayer comprising a vinyl pyrrolidone-vinylidene chloride copolymer and said image-forming layer comprising a light-insensitive, reducible silver source;
- a light-sensitive silver halide;
- a polymeric binder;
- a sensitizer;
- and a phenolic leuco dye that forms a quinoidal dye upon oxidation.
Dependencies are inferred from the claim text.