US 4,808,508 AGranted

Negative working color proofing process comprising diazo compound and polyvinyl acetal/polyvinyl alcohol/polyvinyl acetate resin

AssigneeHoechst Celanese Corporation

InventorStephan J. W. Platzer

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Abstract

This invention relates to negative photosensitized 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 predict the image quality from a lithographic printing process.

Claims23

Dependent claims

A method for forming a colored image which comprises:

(A.) 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, negative working, polymeric diazonium compound;
a resinous binder composition, which composition contains at least 20% of a resin having the general formula
--A--B--C--
wherein a plurality of each of components A, B, and C occur in ordered or random sequence in the resin and wherein A is present in said resin at about 5% to about 20% by weight and comprises groups of he formula ##STR7## B is present in said resin at about 4% to about 30% by weight and comprises groups of the formula ##STR8## and C is present in said resin at about 50% to about 91% by weight and comprises acetal groups consisting of groups of the formulae ##STR9## wherein R is lower alkyl or hydrogen, and wherein said group I. is present in component C from about 75% to about 85%;
group II. is present in component C from about 3 to about 5%;
and group III. is present in component C from about 10% to about 22%;
and at least one colorant;
and
(iii) an adhesive layer in direct contact with said photosensitive layer, which adhesive layer comprises a thermoplastic polymer and which adhesive layer is nontacky at room temperature, thermally activated and can be transferred at temperatures between 60.degree. C. and 90.degree. C.;
and
(B.) either
(i) laminating said element with heat and pressure via said adhesive layer to a developer resistant receiver sheet;
and removing said substrate by the application of peeling forces;
and imagewise exposing said photosensitive layer to actinic radiation;
or
(ii) imagewise exposing said photosensitive layer to actinic radiation;
and laminating said element with heat and pressure via said adhesive layer to a developer resistant receiver sheet;
and removing said substrate by the application of peeling forces;
or
(iii) laminating said element with heat and pressure via said adhesive layer to a developer resistant receiver sheet;
and imagewise exposing said photosensitive layer to actinic radiation;
and removing said substrate by the application of peeling forces;
and
(C.) removing the nonexposed areas of said photosensitive layer with a suitable liquid developer, which removing is conducted at a temperature at which said adhesive layer is substantially nontacky.

24 more elements

Dependencies are inferred from the claim text.

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Abstract

A method for forming a colored image which comprises:

(A.) 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, negative working, polymeric diazonium compound;
a resinous binder composition, which composition contains at least 20% of a resin having the general formula
--A--B--C--
wherein a plurality of each of components A, B, and C occur in ordered or random sequence in the resin and wherein A is present in said resin at about 5% to about 20% by weight and comprises groups of he formula ##STR7## B is present in said resin at about 4% to about 30% by weight and comprises groups of the formula ##STR8## and C is present in said resin at about 50% to about 91% by weight and comprises acetal groups consisting of groups of the formulae ##STR9## wherein R is lower alkyl or hydrogen, and wherein said group I. is present in component C from about 75% to about 85%;
group II. is present in component C from about 3 to about 5%;
and group III. is present in component C from about 10% to about 22%;
and at least one colorant;
and
(iii) an adhesive layer in direct contact with said photosensitive layer, which adhesive layer comprises a thermoplastic polymer and which adhesive layer is nontacky at room temperature, thermally activated and can be transferred at temperatures between 60.degree. C. and 90.degree. C.;
and
(B.) either
(i) laminating said element with heat and pressure via said adhesive layer to a developer resistant receiver sheet;
and removing said substrate by the application of peeling forces;
and imagewise exposing said photosensitive layer to actinic radiation;
or
(ii) imagewise exposing said photosensitive layer to actinic radiation;
and laminating said element with heat and pressure via said adhesive layer to a developer resistant receiver sheet;
and removing said substrate by the application of peeling forces;
or
(iii) laminating said element with heat and pressure via said adhesive layer to a developer resistant receiver sheet;
and imagewise exposing said photosensitive layer to actinic radiation;
and removing said substrate by the application of peeling forces;
and
(C.) removing the nonexposed areas of said photosensitive layer with a suitable liquid developer, which removing is conducted at a temperature at which said adhesive layer is substantially nontacky.

24 more elements