US 5,294,515 AGranted

Photopolymerizable, negative working, peel developable, single sheet color proofing system

AssigneeHoechst Celanese Corporation

InventorsWojciech A. Wilczak, Timothy Hannigan

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Abstract

This invention relates to negative working photopolymerizable sheet constructions which, upon exposure to an actinic radiation source through a screened image, can accurately reproduce said image. The construction is useful as a color proofing film which can be employed to accurately predict the image quality from a lithographic printing process. Image development is by peel apart processing.

Claims31

Dependent claims

A method for forming a colored image which comprises, in order:

(A) providing a photosensitive element which comprises, in order:
(i) a transparent support having a release surface;
and
(ii) a photosensitive composition layer on said release surface, which photosensitive layer comprises an organic binding resin, a colorant, a photoinitiator, and a free radical polymerizable acrylate or methacrylate component having at least two ethylenically unsaturated groups, wherein said binding resin is present in sufficient amount to bind the composition components into a uniform film, and wherein said colorant is present in sufficient amount to uniformly color the composition, and wherein said photoinitiator is present in sufficient amount to initiate the free radical polymerization of said polymerizable component upon exposure to sufficient actinic radiation, and wherein said polymerizable component is present in sufficient amount to provide image differentiation when the composition is imagewise exposed to actinic radiation;
and
(iii) an thermoplastic adhesive layer adhered to said colored, photosensitive layer, which adhesive layer comprises a thermoplastic resin which has a T.sub.g in the range of from about 25.degree. C. to about 100.degree. C.;
and
(B) providing a receiver base to which said adhesive layer is laminated at elevated temperature and pressure;
and then imagewise exposing said photosensitive composition through the transparent support to actinic radiation;
and
(C) stripping away said transparent support and said release layer from said photosensitive composition layer thereby transferring the adhesive layer and the entire colored, photosensitive composition layer to the receiver base;
and
(D) providing a transparent cover sheet having an adhesion promoted surface, and laminating said transparent cover sheet with heat and pressure, to said photosensitive composition layer with the adhesion promoted surface between the transparent cover sheet and said photosensitive composition layer;
and
(E) overall exposing said photosensitive composition through the transparent cover sheet to actinic radiation;
and
(F) peeling apart said transparent cover sheet with its adhesion promoted surface and said receiver base, thereby transferring the imagewise exposed portions of the colored, photosensitive composition from step (B) to the receiver base while the imagewise nonexposed portions of the colored, photosensitive composition from step (B) are transferred to the adhesion promoted surface of the transparent cover sheet.

14 more elements

Dependencies are inferred from the claim text.

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Abstract

A method for forming a colored image which comprises, in order:

(A) providing a photosensitive element which comprises, in order:
(i) a transparent support having a release surface;
and
(ii) a photosensitive composition layer on said release surface, which photosensitive layer comprises an organic binding resin, a colorant, a photoinitiator, and a free radical polymerizable acrylate or methacrylate component having at least two ethylenically unsaturated groups, wherein said binding resin is present in sufficient amount to bind the composition components into a uniform film, and wherein said colorant is present in sufficient amount to uniformly color the composition, and wherein said photoinitiator is present in sufficient amount to initiate the free radical polymerization of said polymerizable component upon exposure to sufficient actinic radiation, and wherein said polymerizable component is present in sufficient amount to provide image differentiation when the composition is imagewise exposed to actinic radiation;
and
(iii) an thermoplastic adhesive layer adhered to said colored, photosensitive layer, which adhesive layer comprises a thermoplastic resin which has a T.sub.g in the range of from about 25.degree. C. to about 100.degree. C.;
and
(B) providing a receiver base to which said adhesive layer is laminated at elevated temperature and pressure;
and then imagewise exposing said photosensitive composition through the transparent support to actinic radiation;
and
(C) stripping away said transparent support and said release layer from said photosensitive composition layer thereby transferring the adhesive layer and the entire colored, photosensitive composition layer to the receiver base;
and
(D) providing a transparent cover sheet having an adhesion promoted surface, and laminating said transparent cover sheet with heat and pressure, to said photosensitive composition layer with the adhesion promoted surface between the transparent cover sheet and said photosensitive composition layer;
and
(E) overall exposing said photosensitive composition through the transparent cover sheet to actinic radiation;
and
(F) peeling apart said transparent cover sheet with its adhesion promoted surface and said receiver base, thereby transferring the imagewise exposed portions of the colored, photosensitive composition from step (B) to the receiver base while the imagewise nonexposed portions of the colored, photosensitive composition from step (B) are transferred to the adhesion promoted surface of the transparent cover sheet.

14 more elements