Negative working color proofing process comprising diazo compound and polyvinyl acetal/polyvinyl alcohol/polyvinyl acetate resin
First Claim
Patent Images
1. 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
space="preserve" listing-type="equation">--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°
C. and 90°
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.
3 Assignments
0 Petitions
Accused Products
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.
-
Citations
23 Claims
-
1. 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
space="preserve" listing-type="equation">--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°
C. and 90°
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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
-
Specification