US 5,183,723 AGranted

Colored image on a degradable sheet material and method of formation

AssigneeHoechst Celanese Corporation

InventorsStephan J. W. Platzer, Arthur E. Procter, Thomas Dunder

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Abstract

This invention relates to a method for forming a colored image on a degradable sheet material. As a result, a negative- or positive-working color proofing sheet can be produced on a variety of printing paper stocks. Upon exposure to an actinic radiation source through a screened image and development, it can accurately reproduce the image on the degradable sheet. The construction is useful as a color proof which can be employed to accurately predict the image quality from a lithographic printing process on a variety of printing surfaces.

Claims22

Dependent claims

A photosensitive article which comprises a colored image on a degradable sheet material, said article prepared by

a. providing a receiver sheet composite formed by adhering two self-supporting, transparent, heat, pressure and developer resistant polymeric films having transparent, pressure or heat sensitive adhesive layers on only one side of the polymeric films to opposite sides of a degradable sheet material via the adhesive layers;
and
b. providing a photosensitive element which comprises in order:
i) a substrate having a release surface;
and
ii) a photosensitive layer on said release surface, which photosensitive layer comprises a light sensitive component selected from the group consisting of negative working, polymeric diazonium compounds or positive working quinone diazide compounds or photopolymerizable compositions in an amount sufficient to photosensitive the layer;
and a resinous binder composition in an amount sufficient to bind the layer components into a uniform film;
and at least one colorant in an amount sufficient to uniformly color the layer;
and
iii) an optional, nonphotosensitive, colorless adhesive layer directly adhered to said colored photosensitive layer, which adhesive layer has a softening point in the range of from about 60.degree. C. to about 180.degree. C.;
and
c. either
i) laminating said photosensitive element with heat and pressure via said photosensitive or adhesive layer of the photosensitive element to one side of said receiver sheet composite;
and removing said substrate by the application of peeling forces;
and imagewise exposing said photosensitive layer to actinic radiation to thereby produce image areas in either the exposed or unexposed areas and oppositely non-image areas in either the unexposed or exposed areas;
or
ii) imagewise exposing said photosensitive layer to actinic radiation to thereby produce image areas in either the exposed or unexposed areas and oppositely non-image areas in either the unexposed or exposed areas;
and laminating said photosensitive element with heat and pressure via said photosensitive or adhesive layer of the photosensitive element to one side of said receiver sheet composite;
and removing said substrate by the application of peeling forces;
or
iii) laminating said photosensitive element with heat and pressure via said photosensitive or adhesive layer of the photosensitive element to one side of said receiver sheet composite;
and imagewise exposing said photosensitive layer to actinic radiation to thereby produce image areas in either the exposed or unexposed areas and oppositely nonimage areas in either the unexposed or exposed areas;
and removing said substrate by the application of peeling forces;
and thereafter
d. removing the nonimage areas of said photosensitive layer produced in step (c) with a liquid developer, which removing is conducted at a temperature at which said photosensitive element is substantially nontacky;
wherein the image areas are in the exposed areas and the non-image areas are in the unexposed areas when the light sensitive component is a negative working, polymeric diazonium compound or a photopolymerizable composition, and the image areas are in the unexposed areas and the non-image areas are in the exposed areas when the light sensitive component is a positive working quinone diazide compound;
and thereafter
e. optionally repeating steps (b) through (d) at least once whereby another photosensitive element produced according to step (b) having at least one different colorant is laminated onto the nonremoved image portions of the previously processed photosensitive layer or layers on the receiver sheet composite;
and
f. optionally repeating steps (b) through (e) with other photosensitive elements produced according to step (b) which are laminated, exposed, and developed on the other side of the receiver sheet composite.

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Dependencies are inferred from the claim text.

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Abstract

A photosensitive article which comprises a colored image on a degradable sheet material, said article prepared by

a. providing a receiver sheet composite formed by adhering two self-supporting, transparent, heat, pressure and developer resistant polymeric films having transparent, pressure or heat sensitive adhesive layers on only one side of the polymeric films to opposite sides of a degradable sheet material via the adhesive layers;
and
b. providing a photosensitive element which comprises in order:
i) a substrate having a release surface;
and
ii) a photosensitive layer on said release surface, which photosensitive layer comprises a light sensitive component selected from the group consisting of negative working, polymeric diazonium compounds or positive working quinone diazide compounds or photopolymerizable compositions in an amount sufficient to photosensitive the layer;
and a resinous binder composition in an amount sufficient to bind the layer components into a uniform film;
and at least one colorant in an amount sufficient to uniformly color the layer;
and
iii) an optional, nonphotosensitive, colorless adhesive layer directly adhered to said colored photosensitive layer, which adhesive layer has a softening point in the range of from about 60.degree. C. to about 180.degree. C.;
and
c. either
i) laminating said photosensitive element with heat and pressure via said photosensitive or adhesive layer of the photosensitive element to one side of said receiver sheet composite;
and removing said substrate by the application of peeling forces;
and imagewise exposing said photosensitive layer to actinic radiation to thereby produce image areas in either the exposed or unexposed areas and oppositely non-image areas in either the unexposed or exposed areas;
or
ii) imagewise exposing said photosensitive layer to actinic radiation to thereby produce image areas in either the exposed or unexposed areas and oppositely non-image areas in either the unexposed or exposed areas;
and laminating said photosensitive element with heat and pressure via said photosensitive or adhesive layer of the photosensitive element to one side of said receiver sheet composite;
and removing said substrate by the application of peeling forces;
or
iii) laminating said photosensitive element with heat and pressure via said photosensitive or adhesive layer of the photosensitive element to one side of said receiver sheet composite;
and imagewise exposing said photosensitive layer to actinic radiation to thereby produce image areas in either the exposed or unexposed areas and oppositely nonimage areas in either the unexposed or exposed areas;
and removing said substrate by the application of peeling forces;
and thereafter
d. removing the nonimage areas of said photosensitive layer produced in step (c) with a liquid developer, which removing is conducted at a temperature at which said photosensitive element is substantially nontacky;
wherein the image areas are in the exposed areas and the non-image areas are in the unexposed areas when the light sensitive component is a negative working, polymeric diazonium compound or a photopolymerizable composition, and the image areas are in the unexposed areas and the non-image areas are in the exposed areas when the light sensitive component is a positive working quinone diazide compound;
and thereafter
e. optionally repeating steps (b) through (d) at least once whereby another photosensitive element produced according to step (b) having at least one different colorant is laminated onto the nonremoved image portions of the previously processed photosensitive layer or layers on the receiver sheet composite;
and
f. optionally repeating steps (b) through (e) with other photosensitive elements produced according to step (b) which are laminated, exposed, and developed on the other side of the receiver sheet composite.

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