Photographic processing composition and film unit
AssigneePolaroid Corporation
InventorsFariza B. Hasan, Daniel D. Huang
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Abstract
The present invention relates to a photographic processing composition comprising an aqueous alkaline medium including titanium dioxide particles and a stabilizing agent comprising a polymer polymerized from repeating units of styrene and an acrylic acid. The presence of the stabilizing agent substantially reduces the settling out of the titanium dioxide particles in the subject processing composition, and maintains the substantially uniform distribution of titanium dioxide particles therein. The subject processing compositions are useful in photographic diffusion transfer film units and processes.
Claims5
A diffusion transfer photographic film unit comprising a photosensitive element comprising a support carrying at least one silver halide emulsion layer associated with an image dye-providing material;
- a second sheet-like element which is in superposed relationship or adapted to be placed in superposed relationship with said photosensitive element;
- an image-receiving layer positioned in one of said photosensitive and second sheet-like elements;
- and
- means providing an aqueous alkaline processing composition for distribution between predetermined layers of said elements, said aqueous alkaline processing composition comprising an aqueous alkaline medium having a pH in excess of 10 and including titanium dioxide particles and a stabilizing agent therein, said stabilizing agent comprising a polymer polymerized from a monomer system comprising:
- repeating units of styrene and repeating units of an acrylic acid.
Dependencies are inferred from the claim text.