Timing layer for color transfer film units comprising copolymer with activation energy to penetration greater than 18 kcal/mole
AssigneeEastman Kodak Company
InventorDavid Eugene Hannie
Life of this patent
Estimating the term…
Abstract
A temporary barrier between reactants in photographic products and especially for color diffusion transfer film unit comprises a polymeric layer of at least partially coalesced latex, said layer having an activation energy of penetration by an aqueous alkaline solution of greater than 18 kcal/mole.
Claims22
A photographic element containing a support having coated thereon, in order, a neutralizing layer and a temporary barrier layer, said barrier comprising a layer comprising a polymeric latex and having an activation energy of penetration from aqueous alkaline solution of greater than 18 kcal/mole, said polymeric latex comprising a polymer comprising 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 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 layer 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 a latex comprising a terpolymer having 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 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 located between said neutralizing layer and said silver halide emulsion layer, said timing layer being permeable by said alkaline processing composition after a predetermined time;
- said film unit containing a silver halide developing agent, the improvement wherein said timing layer comprises a polymeric latex comprising from about 5 to about 35 percent by weight of acrylonitrile, from about 2 to about 10 percent by weight of a member selected from the group consisting of itaconic acid and acrylic acid and from about 55 to about 85 percent by weight of vinylidene chloride.
In a process of 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, a receiving layer and a barrier layer associated with a neutralizing layer being permeable by said alkaline processing composition and which is located between said photosensitive silver halide emulsion layer and said neutralizing layer to light;
- 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-producing material being so 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;
- said film unit containing a silver halide developing agent, the improvement wherein said barrier layer comprises 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 comprising 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 a terpolymer latex comprising 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 said timing layer comprising a terpolymer latex comprising 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.