Photographic material with temporary barrier layer comprising a mixture of vinylidene chloride terpolymer and polymeric carboxy-ester-lactone and photographic transfer process therefor
AssigneeEastman Kodak Company
InventorEdward P. Abel
Life of this patent
Estimating the term…
Abstract
A composition comprising a mixture of (1) from 5 to 95 percent by weight of a copolymer comprising from 55 to 85 percent by weight of vinylidene chloride, 5 to 35 percent by weight of an ethylenically unsaturated monomer, and 0 to 20 percent by weight of an ethylenically unsaturated carboxylic acid, and (2) from 5 to 95 percent by weight of a polymeric carboxy-ester-lactone, is useful as a temporary barrier between reactants in photographic products. The barrier is particularly useful as a process timing layer in color image transfer film units.
Claims29
In a photographic element comprising a support, at least one silver halide emulsion layer, a dye image-providing layer, a dye image-receiving layer and a neutralizing layer, said element containing a single temporary barrier layer coated from an organic solvent coating solution, said barrier layer having an activation energy of penetration by an aqueous alkaline solution of greater than 18 keal/mole and being between said neutralizing layer and said silver halide emulsion layer, said neutralizing layer providing a pH of 11 or less to the silver halide emulsion layer upon breakdown of said barrier layer, the improvement wherein said barrier layer comprises a mixture of (1) from 5 to 95 percent by weight of a copolymer comprising from 55 to 85 percent by weight of vinylidene chloride, 5 to 35 percent by weight of an ethylenically unsaturated monomer, which is different from the other monomers of the copolymer, 0 to 20 percent by weight of a ethylenically unsaturated carboxylic acid, and (2) from 5 to 95 percent by weight of a polymeric carboxy-ester-lactone.
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 layer;
- (b) a dye image-receiving layer;
- (c) alkaline processing composition and means for discharging same within said film unit in contact with said photosensitive layer;
- (d) a neutralizing layer for neutralizing said alkaline processing composition;
- and
- (e) a single barrier layer coated from an organic solvent coating solution, said barrier layer having an activation energy of penetration by an aqueous alkaline solution of greater than 18 keal/mole and being 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, said neutralizing layer providing a pH of 11 or less to the silver halide emulsion layer upon breakdown of said barrier layer, the improvement wherein said barrier layer comprises a mixture of (1) from 5 to 95 percent by weight of a copolymer comprising from 55 to 85 percent by weight of vinylidene chloride, 5 to 35 percent by weight of an ethylenically unsaturated monomer, which is different from the other monomers of the copolymer, 0 to 20 percent by weight of an ethylenically unsaturated carboxylic acid, and (2) from 5 to 95 percent by weight of a polymeric carboxy-ester-lactone.
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 and a single barrier layer coated from an organic solvent coating solution, said barrier layer having an activation energy of penetration by an aqueous alkaline solution of greater than 18 keal/mole and being comprising a mixture of (1) from 5 to 95 percent by weight of a copolymer comprising from 55 to 85 percent by weight of vinylidene chloride, 5 to 35 percent by weight of an ethylenically unsaturated monomer, which is different from the other monomers of the copolymer, and 0 to 20 percent by weight of an ethylenically unsaturated carboxylic acid, and (2) from 5 to 95 percent by weight of a polymeric carboxy-ester-lactone;
- said neutralizing layer providing a pH of 11 or less to the silver halide emulsion layer upon breakdown of said barrier layer.
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 single barrier layer coated from an organic solvent coating solution, said barrier layer having an activation energy of penetration by an aqueous alkaline solution of greater than 18 keal/mole and being associated with the 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, said neutralizing layer providing a pH of 11 or less to the silver halide emulsion layer upon breakdown of said barrier layer, said process comprising:
- (a) imagewise exposing said photographic element;
- (b) treating said element with 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 said 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 layer comprises a mixture of (1) from 5 to 95 percent by weight of a copolymer comprising 55 to 85 percent by weight of vinylidene chloride, from 5 to 35 percent by weight of an ethylenically unsaturated monomer, which is different from the other monomers of the copolymer, and 0 to 20 percent by weight of an ethylenically unsaturated carboxylic acid, and (2) from 5 to 95 percent by weight of a polymeric carboxy-ester-lactone.
Dependencies are inferred from the claim text.