Photographic material with a temporary barrier layer comprising a chill-gelable polymer
AssigneeEastman Kodak Company
InventorsEdward P. Abel, Wayne A. Bowman
Life of this patent
Estimating the term…
Abstract
A polymer comprising polymerized N-alkyl substituted acrylamide and a polymerized crosslinking monomer wherein the polymer has a solubility parameter from about 13 to 16 at 25.degree. C., is useful as a temporary barrier layer between reactants in photographic products. The barrier layer is particularly useful as a process timing layer in color image transfer film units.
Claims22
A photographic element having thereon at least one dye imaging layer, a neutralizing layer, and a chill-gelable temporary barrier layer separating said dye imaging reactant layer from said neutralizing layer, said chill-gelable barrier layer comprising a chill-gelable polymer comprising about 30 to 97 weight percent of polymerized N-alkyl-substituted acrylamide, about 3 to about 25 weight percent of polymerized crosslinking monomer having at least two addition-polymerizable groups per molecule and about 0 to about 60 weight percent of one or more other polymerized addition-polymerizable monomers, said polymer having a solubility parameter .delta. from about 13 to 16 at 25.degree. C. with the proviso that said monomers comprise less than 5 weight percent of cationic monomers, less than 15 weight percent of free acid monomers, and less than 3 weight percent of metal or ammonium salts of acid monomers.
In a photographic element comprising a support, at least one silver halide layer, at least one dye imaging layer, at least one neutralizing layer, and a temporary barrier layer separating said dye imaging layer from said neutralizing layer, the improvement wherein said barrier layer is chill-gelable and comprises a chill-gelable polymer comprising about 30 to 97 weightpercent of polymerized N-alkyl-substituted acrylamide, about 3 to about 25 weight percent of polymerized crosslinking monomer having at least two addition-polymerizable groups per molecule and about 0 to about 60 weight percent of one or more other polymerized addition-polymerizable monomers, said polymer having a solubility parameter .delta. from about 13 to 16 at 25.degree. C. with the proviso that said monomers comprise less than 5 weight percent of cationic monomers less than 15 weight percent of free acid monomers, and less than 3 weight percent of metal or ammonium salts of acid monomers.
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 temporary barrier layer having a negative activation energy and being located 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, the improvement wherein said barrier layer is chill-gelable and comprises a chill-gelable polymer comprising about 30 to 97 weight percent of polymerized N-alkyl-substituted acrylamide, about 3 to about 25 weight percent of polymerized crosslinking monomer having at least two addition-polymerizable groups per molecule and about 0 to about 60 weight percent of one or more other polymerized addition-polymerizable monomers, said polymer having a solubility parameter .delta. from about 13 to 16 at 25.degree. C. with the proviso that said monomers comprise less than 5 weight percent of cationic monomers, less than 15 weight percent of free acid monomers, and less than 3 weight percent of metal or ammonium salts of acid monomers.
In a photographic film unit comprising:
- (a) a support having thereon at least one photosensitive silver halide emulsion layer having associated herewith 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 layerfo rneutralizing said alkaline processing composition;
- and
- (e) a barrier layer having a negative activation energy of penetration by an aqueous alkaline solution, and 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 is chill-gelable and comprises a chill gelable polymer comprising about 30 to 97 weight percent of polymerized N-alkyl-substituted acrylamide, about 3 to about 25 weight percent of polymerized crosslinking monomer having at least two addition-polymerizable groups per molecule and about 0 to about 60weight percent of one or more other polymerized addition-polymerizable monomers, said polymer having a solubility parameter .delta. from about 13 to 16 at 25.degree. C. with the proviso that said monomers comprise less than 5 weight percent of cationic monomers, less than 15 weight percent of free acid monomers, and less than 3 weight percent of metal or ammonium salts of acid monomers.
Dependencies are inferred from the claim text.