Cover sheets for integral imaging receiver elements

Claim 2

In a photographic film unit comprising: (a) an integral imaging receiver element comprising a support having thereon at least one photosensitive silver halide emulsion layer having associated therewith a dye image providing material and a dye image receiving layer containing a dye mordant; and having adjacent to said intergral imaging receiver element; (b) a cover sheet comprising, in order, starting with the layer adjacent to said integral imaging receiver element, a barrier timing layer, a neutralizing layer for neutralizing an alkaline processing composition and a support; and (c) an aqueous alkaline processing composition and means for discharging same between said integral imaging receiver element and said cover sheet; the improvement comprising an alkali permeable hydrophilic layer which is substantially free of dye mordant coated over said barrier timing layer on said cover sheet so as to be between said barrier timing layer and said integral imaging receiver element.

Claim 3

The photographic film unit of claim 1 wherein said alkali permeable hydrophilic layer comprises a material selected from the group consisting of gelatin, poly(vinyl alcohol), poly(ethyl methacrylate-co-methacrylic acid), poly(methyl methacrylate-co-methacrylic acid), poly(methyl vinyl ether-co-maleic anhydride), casein, carboxymethyl cellulose, cellulose phthalate and hydroxyethylcellulose and grafted starch copolymers.

Claim 4

The photographic film unit of claim 1 further comprising an alkali permeable adhesion promoting layer coated on said hydrophilic layer, said adhesion promoting layer being adjacent to said integral imaging receiver element.

Claim 5

The photographic film unit of claim 3 wherein said adhesion-promoting layer further comprises a matting agent.

Claim 6

The photographic film unit of claim 1 wherein said alkali permeable hydrophilic layer is the outermost layer of said cover sheet and wherein said alkali-permeable hydrophilic layer further comprises a matting agent.

Claim 7

The photographic film unit of either claim 5 or 4 wherein said matting agent comprises methyl methacrylate beads.

Claim 8

The photographic film unit of claim 1 wherein said barrier timing layer has an activation energy of penetration of the layer by aqueous alkaline solution of greater than 18 kcal/mole and comprises polymer latex comprising a terpolymer 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 a polymerized unsaturated carboxylic acid and from about 55 to about 85 percent by weight of polymerized vinylidene chloride.

Claim 9

The photographic film unit of claim 1 wherein said alkali permeable hydrophilic layer comprises gelatin.

Claim 10

The photographic film unit of claim 8 wherein said gelatin alkali permeable hydrophilic layer is coated at a coverage of from 3 to 4 grams per square meter of cover sheet.

Claim 11

The photographic film unit of claim 9 wherein said gelatin alkali permeable hydrophilic layer further comprises 0.5 to 2.0 weight percent of hardener.

Claim 12

The photographic film unit of claim 1 wherein said alkali permeable hydrophilic layer is coated at a coverage of from 2 to 5.5 grams per square meter of cover sheet.

Claim 13

The photographic film unit of claim 10 wherein said hardener is bis(vinylsulfonylmethyl) ether present at about 1.0 weight percent.

Claim 14

The photographic film unit of claim 1 having a first and a second barrier timing layer wherein said first layer is adjacent to said neutralizing layer and comprises a polymer and has an activation energy of penetration of the layer by an aqueous alkaline solution of less than 18 kcal/mole and wherein said second layer is coated over said first layer and comprises a polymer latex and has an activation energy of penetration of the layer by aqueous alkaline solution of greater than 18 kcal/mole and comprises a terpolymer 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 a polymerized unsaturated carboxylic acid and from about 55 to about 85 percent by weight of polymerized vinylidene chloride.

Claim 15

The photographic film unit of claim 13 wherein said first barrier timing layer comprises a mixture of cellulose acetate and a maleic anhydride copolymer, said mixture comprising about 5 to about 50 percent by weight of said copolymer.

Claim 16

The photographic film unit of claim 13 wherein said second barrier layer comprises from about 5 to about 35 percent by weight of acrylonitrile, from about 4 to about 10 percent by weight of an ethylenically unsaturated carboxylic acid selected from the group consisting of acrylic acid and itaconic acid, and from about 55 to about 85 percent by weight of vinylidene chloride.

Claim 17

The photographic film unit of claim 1 wherein (a) said support for said integral image receiving element is transparent; (b) said dye image receiving layer is adjacent to said transparent support and separated from said silver halide emulsion layer by an alkaline solution permeable reflective opaque layer; (c) said support for said cover sheet is transparent; and (d) said discharging means is a rupturable container containing said alkaline processing composition and an opacifying agent.

Claim 18

The film unit of claim 1 wherein (a) said integral imaging receiver element comprises a transparent support having thereon, in order, an image-receiving layer; an alkaline solution-permeable, light-reflective layer; an alkaline solution-permeable opaque layer, a red-sensitive silver halide emulsion layer having a ballasted redox cyan dye releaser associated therewith; a green-sensitive silver halide emulsion layer having a ballasted redox magenta dye releaser associated therewith; and a blue-sensitive silver halide emulsion layer having a ballasted redox yellow dye releaser associated therewith; (b) said cover sheet comprises, in order, an alkali permeable adhesion promoting layer; an alkali permeable hydrophilic layer which is substantially free of dye mordant coated at a coverage of between 2 and 5.5 grams per square meter of cover sheet; a barrier layer which comprises a polymeric latex and has an activation energy of penetration of the layer by an aqueous alkaline solution of greater than 18 kcal/mole and comprises a terpolymer 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 a polymerized unsaturated carboxylic acid and from about 55 to about 85 percent by weight of polymerized vinylidene chloride; a polymeric barrier timing layer having an activation energy of penetration of the layer by an aqueous alkaline solution of less than 18 kcal/mole; a neutralizing layer for neutralizing an aqueous alkaline processing composition; and a transparent support.

Claim 19

The film unit of claim 17 wherein each said redox dye releaser is a nondiffusible sulfonamido compound which is alkali-cleavable upon oxidation to release a diffusible colorproviding moiety from the benzene nucleus, said compound having the formula: ##STR5## wherein: (a) col is a dye or dye precursor moiety; (b) Ball is an organic ballasting group which renders said compound nondiffusible in a photographic element during development in an alkaline processing composition having a pH of at least 11; (c) Y represents the carbon atoms necessary to complete a carrier moiety; and (d) G is OR or NHR 1 wherein R is hydrogen or a hydrolyzable moiety and R 1 is hydrogen or an alkyl group of 1 to 22 carbon atoms.