US 4,425,421 AGranted

Process for the production of a laminar article and such article containing information in a hydrophilic colloid stratum

AssigneeAgfa-Gevaert

InventorsAntonius A. Rutges, Ludovicus M. Mertens, Maurits W. Van Grasdorff

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Abstract

A process for the production of a sealed laminate especially a security document comprising a support sheet, an image layer containing a photographic image present in a hardened hydrophilic diffusion transfer reversal image-receiving colloid medium made from an image receiving layer containing photosensitive iron(III) compound, and a protective cover sheet is described wherein: (1) the support sheet is of a polymeric heat meltable material, (2) the image layer is disposed adherently on the support sheet to cover the support area only partly and to leave uncovered at least one edge area thereof, (3) the protective sheet is of a heat-meltable material which in the melted state is capable of forming a homogeneous mass with melted support sheet material, and (4) the protective cover sheet is heat sealed to the support sheet in the uncovered areas thereof to form the homogeneous mass, whereby said image layer is sealed between the support sheet and the protective sheet.

Claims14

Dependent claims

Process for the production of a sealed laminate comprising a support layer of a heat-meltable material, an image layer containing a photographic image present in a hydrophilic colloid binder and a protective sheet, characterized by the steps comprising:

(1) disposing adherently on a polymeric meltable support layer an image layer for receiving an image and containing development nuclei acting as a catalyst for development of silver complexes to silver or a mordant suited for the mordanting of dyes applied in a dye diffusion transfer imaging process, said image layer containing also a photosensitive iron(III) compound capable of forming iron(II) ions on exposure to actinic radiation, and a hydrophilic colloid that undergoes a reduction in water-solubility on oxidization of said iron(II) ions with hydrogen peroxide,
(2) pattern-wise photo-exposing said hydrophilic colloid binder layer,
(3) treating the exposed hydrophilic colloid binder layer with an aqueous peroxide solution to reduce thereby the water-solubility of said binder in the exposed areas,
(5) removing the unexposed, unhardened and still water-soluble areas of said hydrophilic colloid binder layer by wash-off to leave on the support image layer regions corresponding with the exposed areas,
(6) forming a silver or dye diffusion transfer image in the remaining image layer regions either immediately after step (2) or immediately after step (5),
(7) providing a protective sheet formed of a heat-meltable polymeric material which in the melted state is capable of fusing into a homogeneous mass with melted support layer material, and
(8) heat-sealing said protective sheet to said support layer in the areas of the support free of said image layer to form in said areas a homogeneous mass, whereby said image layer is sealed between said support layer and said protective sheet and peeling apart of said support layer and protective sheet material is prevented.

4 more elements

Process for the production of a sealed laminar article comprising a support sheet, an image layer containing a photographic image contained in a hydrophilic colloid binder and a protective sheet, characterized in that said process comprises the steps of

(1) Removably disposing on a temporary support material an image layer which is an image receiving layer containing development nuclei acting as a catalyst for development of silver complexes to silver or as a mordant suited for the mordanting of dyes applied in a dye diffusion transfer imaging process, and said layer containing also a photosensitive iron (III) compound, by means of which iron (II) ions are produced on exposure to actinic radiation, and a hydrophilic colloid binder that undergoes a reduction in water-solubility on oxidizing said iron (II) ions with hydrogen peroxide,
(2) pattern-wise photo-exposing said hydrophilic colloid binder layer,
(3) treating the exposed hydrophilic colloid binder layer with an aqueous peroxide solution reducing thereby the water-solubility of said binder in the exposed areas,
(4) removing the unexposed, unhardened and still water-soluble portions of said hydrophilic colloid binder layer by wash-off leaving on the support (an) image layer stratum(s) of said hydrophilic colloid binder layer corresponding with the exposed areas,
(5) forming a silver or dye diffusion transfer image in said image layer stratum(s) either immediately after step (2) or immediately after step (4),
(6) transferring said image layer stratum containing the silver or dye diffusion image therein onto a permanent polymeric meltable support material,
(7) providing over said transferred stratum a protective sheet formed of a heat-meltable polymeric material which in the melted state is capable of forming a homogeneous mass with melted support sheet material, and
(8) heat-sealing said protective sheet to said support sheet in the areas of the support free of said image layer to form in said areas a homogeneous mass, whereby said image layer is sealed between said support sheet and said protective sheet preventing thereby peeling apart of said support sheet and protective sheet material.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 06/421,419Filed 22 Sep 1982
Priority: GB 81305579 Oct 1981
Granted: 10 Jan 1984
Term ends: Not estimatedThe source records don’t support an estimate.

Classification27 codes

B32B 27/304
Comprising vinyl polymers; comprising acrylic polymers: comprising vinyl halide polymers, e.g. PVC, PVDC, PVF, PVDF
B32B 27/06
Layered products comprising a layer of synthetic resin: as the main or only constituent of a layer, which is next to another layer of the same or…
B32B 27/36
Layered products comprising a layer of synthetic resin: comprising polyesters
B32B 37/1207
Characterised by using adhesives: heat-activated adhesive