Photolithographic element containing a silver-receptive polyaldehyde-containing receiving layer
AssigneeMinnesota Mining and Manufacturing Company
InventorsGerard H. Kinderman, James F. Sanders
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Abstract
A photolithographic sheet capable of forming a lithographic printing plate upon imaging via silver salt diffusion transfer comprising a support, a silver halide emulsion, and a receptor layer overlying the emulsion, the receptor layer comprising a high molecular weight hydrophilic polymer and catalytic nuclei for silver salt diffusion transfer development, the major proportion of the polymer being a dialdehyde polysaccharide.
Claims18
A photolithographic light-sensitive sheet capable of providing a lithographic plate after imaging by diffusion transfer comprising a support, a silver halide emulsion layer overlying said support, and a receptor layer overlying said emulsion, said receptor layer comprising at least one high molecular weight hydrophilic polymer and catalytic nuclei for silver salt diffusion transfer development, the major proportion of said polymer being a dialdehyde polysaccharide.
A lithographic plate comprising a support, a silver halide emulsion layer over said support, and a receptor layer over said emulsion layer having ink receptive image areas on the surface thereof, said receptor layer comprising a high molecular weight hydrophilic polymer and catalytic nuclei for silver salt diffusion transfer development, the major proportion of said polymer being a dialdehyde polysaccharide, and said image areas comprising silver metal produced by silver salt diffusion transfer development in said receptor layer.
A process for forming a lithographic plate comprising the steps of:
- (1) exposing a photolithographic element comprising a support having a silver halide emulsion thereon to actinic radiation;
- (2) developing said silver halide emulsion by silver salt diffusion transfer in the presence of a diffusion transfer receptor layer, said receptor layer comprising a high molecular weight hydrophilic polymer and catalytic nuclei for silver salt diffusion transfer development, the major proportion of said polymer being a dialdehyde polysaccharide.
Dependencies are inferred from the claim text.