Combination of two timing layers for photographic products
AssigneeEastman Kodak Company
InventorsDavid Eugene Hannie, Gerald Louis Ducharme
Life of this patent
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Abstract
A temporary barrier between reactants in photographic products and especially for color diffusion transfer film units comprises two contiguous layers, one layer comprising a polymeric timing layer and having an activation energy of penetration of the layer by an aqueous alkaline solution of less than 18 kcal/mole and the second layer comprising a coalesced or partially coalesced polymeric latex and having an activation energy for the process of penetration of the layer by an aqueous alkaline solution of greater than 18 kcal/mole.
Claims32
A photographic element comprising a support, at least one silver halide emulsion layer, a dye image receiving layer and a neutralizing layer, said element containing a temporary barrier between said neutralizing layer and said silver halide emulsion layer, said barrier comprising a combination of two layers wherein the first layer comprises a polymeric latex comprising a polymer of from about 5 to about 35 percent by weight of polymerized ethylenically unsaturated monomer, from about 2 to about 10 percent by weight of polymerized ethylenically unsaturated carboxylic acid and from about 55 to about 85 percent by weight of polymerized vinylidene chloride and has an activation energy of penetration of the layer by an aqueous alkaline solution of greater than 18 kcal/mole and the second layer comprises a polymer material and has an activation energy of penetration of the layer by an aqueous alkaline solution of less than 18 kcal/mole.
In a photographic film unit 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 in contact with said photosensitive layer;
- d. a neutralizing layer for neutralizing said alkaline processing composition;
- and
- e. a barrier which is permeable by said alkaline processing composition after a predetermined time located between said neutralizing layer and said photosensitive silver halide emulsion;
- said film unit containing a silver halide developing agent, the improvement wherein said barrier comprises two contiguous timing layers, one layer comprising a polymeric latex comprising a polymer of from about 5 to about 35 percent by weight of polymerized ethylenically unsaturated monomer, from about 2 to about 10 percent by weight of polymerized ethylenically unsaturated carboxylic acid and from about 55 to about 85 percent by weight of polymerized vinylidene chloride, said one layer having an activation energy to penetration from aqueous alkaline solution of greater than 18 kcal/mole and the second layer comprising a polymeric material and having an activation energy to penetration from aqueous alkaline solution of less than 18 kcal/mole.
In a photographic film unit 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 in contact with said photosensitive layer;
- d. a neutralizing layer for neutralizing said alkaline processing composition;
- and
- e. a barrier which is permeable by said alkaline processing composition after a predetermined time located between said neutralizing layer and all of said photosensitive silver halide emulsions;
- said film unit containing a silver halide developing agent, the improvement wherein said barrier comprises two contiguous timing layers, one layer comprising a polymeric material comprising a polymer of from about 5 to about 35 percent by weight of polymerized ethylenically unsaturated monomer, from about 2 to about 10 percent by weight of polymerized ethylenically unsaturated carboxylic acid and from about 55 to about 85 percent by weight of polymerized vinylidene chloride, said one layer having an activation energy to penetration from aqueous alkaline solution of greater than 18 kcal/mole and the second layer comprising a polymeric material and having an activation energy to penetration from aqueous alkaline solution of less than 18 kcal/mole.
In a photographic film unit 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 barrier located between said photosensitive silver halide emulsion layer and said neutralizing layer and which is permeable by said alkaline processing composition after a predetermined time;
- said film unit containing a silver halide developing agent, the improvement wherein said barrier comprises two layers, one layer having an activation energy of penetration of the layer by an aqueous alkaline solution of less than 18 kcal/mole, said one layer comprising a mixture of cellulose acetate and a maleic anhydride copolymer, said mixture comprising about 5 to about 50 percent by weight of said copolymer, and the second layer having an activation energy to penetration from aqueous alkaline solution of greater than 18 kcal/mole comprising a polymeric latex comprising a polymer of from about 5 to about 35 percent by weight of polymerized ethylenically unsaturated monomer, from about 2 to about 10 percent by weight of polymerized ethylenically unsaturated carboxylic acid and from about 55 to about 85 percent by weight of polymerized vinylidene chloride.
In a photographic film unit comprising:
- a. a transparent 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 located between said transparent support and said silver halide emulsion;
- and
- c. means for discharging an alkaline processing composition within said film unit;
- said film unit containing a silver halide developing agent, the improvement wherein said film unit includes a transparent cover sheet over the layer outermost from said support, said transparent cover sheet being coated sequentially with a neutralizing layer for neutralizing said alkaline processing composition, a layer having an activation energy to penetration from aqueous alkaline solution of less than 18 kcal/mole comprising a mixture of cellulose acetate and a maleic anhydride copolymer, said mixture comprising about 5 to about 50% by weight of said copolymer, and a layer comprising a polymeric latex having an activation energy to penetration from aqueous alkaline solution of greater than 18 kcal/mole respectively said polymeric latex comprising a polymer of from about 5 to about 35 percent by weight of polymerized ethylenically unsaturated monomer, from about 2 to about 10 percent by weight of polymerized ethylenically unsaturated carboxylic acid and from about 55 to about 85 percent by weight of polymerized vinylidene chloride.
In a process of producing a photographic transfer image in a photographic element comprising a support having thereon at least one photosensitive silver halide emulsion layer having associated therewith a dye image-providing material, a receiving layer, a barrier associated with a neutralizing layer being permeable by said alkaline processing composition after a predetermined time and which is located between said photosensitive silver halide emulsion layer and said neutralizing layer, comprising:
- a. imagewise exposing said photographic element;
- 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;
- i. an imagewise distribution of dye image-providing material being formed as a function of development and
- ii. at least a portion of said imagewise distribution of dye image-providing material diffusing to said dye image-receiving layer;
- and
- c. neutralizing said alkaline processing composition by means of said neutralizing layer associated with said photographic element after said predetermined time;
- the improvement wherein said barrier comprises two timing layers, one layer comprising a polymer having an activation energy to penetration from aqueous alkaline solution of less than 18 kcal/mole and the second layer comprising a polymeric latex having an activation energy to penetration from aqueous alkaline solution of greater than 18 kcal/mole, said polymeric latex comprising a polymer of from about 5 to about 35 percent by weight of polymerized ethylenically unsaturated monomer, from about 2 to about 10 percent by weight of polymerized ethylenically unsaturated carboxylic acid and from about 55 to about 85 percent by weight of polymerized vinylidene chloride.
In a process of producing a photographic transfer image in color in a photographic element comprising a support having thereon at least one photosensitive silver halide emulsion layer having associated therewith a dye image-providing material, a receiving layer, a barrier associated with a neutralizing layer being permeable by said alkaline processing composition after a predetermined time and which is located between said photosensitive silver halide emulsion layer and said neutralizing layer comprising:
- a. imagewise exposing said photographic element;
- 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;
- i. an imagewise distribution of dye image-providing material being formed as a function of development and
- ii. at least a portion of said imagewise distribution of dye image-providing material diffusing to said dye image-receiving layer;
- and
- c. 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 barrier two contiguous timing layers, one layer having an activation energy to penetration from aqueous alkaline solution of less than 18 kcal/mole, said one layer comprising a mixture of cellulose acetate and a maleic anhydride copolymer, said mixture comprising about 5 to about 50 percent by weight of said copolymer, and the second layer comprising a polymeric latex having an activation energy to penetration from aqueous alkaline solution of greater than 18 kcal/mole, said polymeric latex comprising a polymer of from about 5 to about 35 percent by weight of polymerized ethylenically unsaturated monomer, from about 2 to about 10 percent by weight of polymerized ethylenically unsaturated carboxylic acid and from about 55 to about 85 percent by weight of polymerized vinylidene chloride.
In a dye image-receiving element comprising a support having thereon, in order, a neutralizing layer, a timing layer and a dye image-receiving layer, the improvement comprising employing as said timing layer two contiguous layers, one layer having an activation energy of penetration from aqueous alkaline solution of less than 18 kcal/mole, said one layer comprising a mixture of cellulose acetate and a maleic anhydride copolymer, said mixture comprising about 5 to about 50 percent by weight of said copolymer, and the second layer comprising a polymeric latex having an activation energy to penetration from aqueous alkaline solution of greater than 18 kcal/mole, said polymeric latex comprising a polymer of from about 5 to about 35 percent by weight of polymerized ethylenically unsaturated monomer, from about 2 to about 10 percent by weight of polymerized ethylenically unsaturated carboxylic acid and from about 55 to about 85 percent by weight of polymerized vinylidene chloride.
In a cover sheet for use with a color diffusion transfer assemblage comprising a transparent support having thereon, in order, a neutralizing layer and a timing layer, the improvement comprising applying as said timing layer two contiguous layers comprising one layer having an activation energy to penetration from aqueous alkaline solution of less than 18 kcal/mole, said one layer comprising a mixture of cellulose acetate and a maleic anhydride copolymer, said mixture comprising about 5 to about 50 percent by weight of said copolymer, and the second layer comprising a polymeric latex having an activation energy to penetration from aqueous alkaline solution of greater than 18 kcal/mole, said polymeric latex comprising a polymer of from about 5 to about 35 percent by weight of polymerized ethylenically unsaturated monomer, from about 2 to about 10 percent by weight of polymerized ethylenically unsaturated carboxylic acid and from about 55 to about 85 percent by weight of polymerized vinylidene chloride.
Dependencies are inferred from the claim text.