Timing layer for color transfer assemblages comprising a mixture of cellulose acetate and maleic anhydride copolymer
AssigneeEastman Kodak Company
InventorEdward P. Abel
Life of this patent
Estimating the term…
Abstract
Timing layer for color diffusion transfer assemblages comprises a mixture of cellulose acetate and a maleic anhydride copolymer with 2 to 20% by weight of the mixture being said copolymer.
Claims24
In a photographic assemblage comprising:
- a. a support having thereon at least one photosensitive silver halide emulsion layer having associated therewith a dye image-providing material;
- b. a dye image-receiving layer;
- c. means for discharging an alkaline processing composition within said film unit;
- d. a neutralizing layer for neutralizing said alkaline processing composition;
- and
- e. a timing layer disposed between said neutralizing layer and said photosensitive siler halide emulsion layer so that said processing composition must first permeate said timing layer before contacting said neutralizing layer;
- said film unit containing a silver halide developing agent, the improvement wherein said timing layer comprises a compatible mixture of cellulose acetate and a maleic anhydride copolymer to provide a clear layer, said mixture comprising about 2 to about 20% by weight of said copolymer.
In a process for producing a photographic transfer image in color comprising:
- a. imagewise exposing a photographic element comprising a support having thereon at least one photosensitive silver halide emulsion layer having associated therewith a dye image-providing material;
- b. treating said element with an alkaline processing composition in the presence of a silver halide developing agent to effect development of each of said exposed silver halide emulsion layers, said processing composition contacting said emulsion layer prior to contactig a neutralizing layer;
- c. an imagewise distribution of dye image-providing material being formed as a function of development;
- d. at least a portion of said imagewise distribution of dye image-providing material diffusing to a dye image-receiving layer;
- e. permeating a timing layer associated with a neutralizing layer with said alkaline processing composition after a predetermined time, said timing layer being disposed between said neutralizing layer and said photosensitive silver halide emulsion layer so that said processing composition must first permeate said timing layer before contacting said neutralizing layer;
- f. neutralizing said alkaline processing composition by means of said neutralizing layer associated with said photographic element after said predetermined time;
- the improvement comprising employing as said timing layer a compatible mixture of cellulose acetate and a maleic anhydride copolymer to provide a clear layer, said mixture comprising about 2 to about 20% by weight of said copolymer.
In a dye image-receiving element comprising a support having thereon in sequence a neutralizing layer, a timing layer and a dye image-receiving layer, the improvement comprising employing as said timing layer a compatible mixture of cellulose acetate and a maleic anhydride copolymer to provide a clear layer, said mixture comprising about 2 to about 20% by weight of said copolymer.
Dependencies are inferred from the claim text.