EP0127787A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Hydrolyzable diffusion control layers in photographic products
Assignee: Polaroid Corp
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Filing: 1984-05-04
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Granted: —
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Expires: 2004-05-04
Abstract
Abstract Photographic diffusion transfer film units including polymeric diffusion control layers are disclosed. The diffusion control layers comprise polymers which are hydrolyzable in an alkaline medium so as to convert a layer comprising one or more of the polymers from a condition of impermeability to alkali or materials soluble in or solubilized by an aqueous alkaline processing composition to a condition of substantial permeability thereto.
Inventors
- 👤 Stanley J. Jasne
- 👤 William C. Schwarzel
- 👤 Charles I. Sullivan
- 👤 Lloyd D. Taylor
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-28 18:40
CPC Classifications
G; G03; G03C; G03C8/00; G03C8/42; G03C8/52; G03C8/54
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
176 words
A photographic product comprising: a support layer; at least one photosensitive silver halide layer having associated therewith a diffusion transfer process image-providing material; , an alkaline processing composition permeable image-receiving layer; and at least one diffusion control layer including a polymer adapted to conversion from a condition of impermeability to alkali or materials soluble in or solubilized by an alkaline processing composition to a condition of substantial permeability thereto, characterized in that said layer includes a polymer hydrolyzable under the alkaline conditions of an alkaline photographic processing composition to said condition of substantial permeability, the hydrolyzable polymer comprising repeating units having the formula wherein R is hydrogen, halogen or lower alkyl; A and D are each independently hydrogen, alkyl, alkoxy, aryl, alkaryl or aralkyl; and Z represents an electron-withdrawing group which, upon contact of the polymer with alkali, activates the hydrolytic degradation of the polymer with accompanying formation of an acrylate anion, or represents an electron-withdrawing group which, upon contact of the polymer with alkali, is itself hydrolyzed with accompanying formation of a residual carboxylate anion.
Claim 2
Dependent Claim
176 words
A photographic product comprising: a support layer; at least one photosensitive silver halide layer having associated therewith a diffusion transfer process image-providing material; , an alkaline processing composition permeable image-receiving layer; and at least one diffusion control layer including a polymer adapted to conversion from a condition of impermeability to alkali or materials soluble in or solubilized by an alkaline processing composition to a condition of substantial permeability thereto, characterized in that said layer includes a polymer hydrolyzable under the alkaline conditions of an alkaline photographic processing composition to said condition of substantial permeability, the hydrolyzable polymer comprising repeating units having the formula wherein R is hydrogen, halogen or lower alkyl; A and D are each independently hydrogen, alkyl, alkoxy, aryl, alkaryl or aralkyl; and Z represents an electron-withdrawing group which, upon contact of the polymer with alkali, activates the hydrolytic degradation of the polymer with accompanying formation of an acrylate anion, or represents an electron-withdrawing group which, upon contact of the polymer with alkali, is itself hydrolyzed with accompanying formation of a residual carboxylate anion.
Claim 3
Dependent Claim
44 words
Photographic product according to claim 1 characterized in that said electron-withdrawing group Z is a group which, upon contact of the polymer with alkaline processing composition, activates the hydrolytic degradation of pendant ester groups of the polymer with accompanying formation of carboxylic anion groups.
Claim 4
Dependent Claim
37 words
Photographic product according to claim 2 characterized in that said Z group is a group having the formula where Y is - R 2 of - OR 2 and R 2 is alkyl, aryl, alkaryl or aralkyl.
Claim 5
Dependent Claim
17 words
Photographic product according to any preceding claim characterized in that each of A and D is hydrogen.
Claim 6
Dependent Claim
42 words
Photographic product according to any preceding claim characterized in that said diffusion control layer including said hydrolyzable polymer is a layer permeable to alkali but substantially impermeable to processing composition soluble and diffusible dye image-forming material until hydrolysis of said hydrolyzable polymer.
Claim 7
Dependent Claim
35 words
Photographic product according to any of claims 1 to 4 characterized in that said diffusion control layer including said hydrolyzable polymer is a layer substantially impermeable to processing composition until hydrolysis of said hydrolyzable polymer.
Claim 8
Dependent Claim
25 words
Photographic product according to any preceding claim characterized in that said diffusion control layer includes a matrix polymer in which is polymerized said hydrolyzable polymer.
Claim 9
Dependent Claim
45 words
Photographic product according to claim 7 characterized in that said matrix polymer is a copolymer comprising recurring comonomeric units selected from the group consisting of acrylic acid; methacrylic acid; methylmethacrylate; 2-acrylamido-2-methylpropane sulfonic acid; acrylamide; methacrylamide; N,N-dimethylacrylamide; ethylacrylate; butylacrylate; diacetone acrylamide; acrylamido acetamide; and methacrylamido acetamide.
Claim 10
Dependent Claim
72 words
Photographic product according to any of claims 1 to 5, 7 and 8 characterized by at least two selectively sensitized silver halide emulsion layers, each associated with an image dye-providing material which provides an image dye possessing spectral absorption characteristics substantially complementary to the predominant sensitivity range of its associated emulsion, wherein said diffusion control layer is an interlayer positioned between said silver halide emulsion layers, and their associated image dye-providing materials.
Claim 11
Dependent Claim
41 words
Photographic product according to any of claims 1 to 4 and 6 to 8 characterized in that said diffusion control layer including said hydrolyzable polymer is a neutralization timing layer substantially impermeable to processing composition until hydrolysis of said hydrolyzable polymer.
Claim 12
Dependent Claim
24 words
Photographic product according to any preceding claim characterized in that it includes an image-receiving layer adapted for forming a visible image by diffusion transfer.
Claim 13
Dependent Claim
40 words
Photographic product according to claim 11 characterized in that said support and silver halide layer with associated image-providing material comprises a photosensitive element and said image-receiving layer is contained on an image-receiving element including a support for said image-receiving layer.
Claim 14
Dependent Claim
17 words
Photographic product according to any preceding claim characterized in that said image-providing material is a dye developer.
Claim 15
Dependent Claim
27 words
Photographic product according to claim 12 characterized in that said image-receiving element comprises a support layer, a neutralizing layer, a neutralization timing layer and said image-receiving layer.
Claim 16
Dependent Claim
20 words
Photographic product according to claim 14 characterized in that said timing layer includes said hydrolyzable polymer having the recited formula.
References Cited (Backward Citations)
No citation records indexed.
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