Photopolymerizable coating composition and lithographic printing plate produced therefrom
AssigneeAnocoil Corporation
InventorsRobert F. Gracia, Shek C. Hong, William J. Ryan
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Abstract
The present invention provides photopolymerizable coating compositions comprising (a) a photosensitive compound selected from the group consisting of photoinitiators and negative-working photosensitive substances which are present in an amount effective to render the compositions sensitive to radiant energy, and (b) an ethylenically unsaturated, urethane-containing, self-crosslinkable grafted cellulose ester polymer; imaging elements for use in offset printing processes prepared therefrom; and processes employing said imaging elements.
Claims18
A photopolymerizable coating composition comprising
- (a) a diazonium salt condensation product of a condensible aromatic diazonium compound with an aldehyde;
- (b) an ethylenically unsaturated, urethane-containing, self-crosslinkable cellulose ester polymer of the formula ##STR9## wherein R.sup.1 is a (meth)acrylate moiety of the formula ##STR10## R.sup.2 is a .alpha.-methylstyrene moiety of the formula ##STR11## R.sup.3 is independently H, ##STR12## x is 0.1 to 2.5 y is 0.1 to 2.0
- z is 0.1 to 2.0 and
- n is 30-250, provided that (x+y+z) is in the range of 0.3 to 3.0 and
- (c) a dye.
A printing plate comprising a lithographic substrate coated with a photopolymerizable coating composition comprising
- (a) one or more ethylenically unsaturated acrylic polymerizable monomers or oligomers;
- (b) a dye or pigment;
- (c) a photoinitiator;
- (d) a stabilizer;
- and
- (e) an ethylenically unsaturated urethane-containing, self-crosslinkable grafted cellulose ester polymer of the formula:
- ##STR13## wherein R.sup.1 is a (meth)acrylate moiety of the formula ##STR14## R.sup.2 is a .alpha.-methylstyrene moiety of the formula ##STR15## R.sup.3 is independently H, ##STR16## x is 0.1 to 2.5 y is 0.1 to 2.0
- z is 0.1 to 2.0 and
- n is 30-250, provided that (x+y+z) is in the range of 0.3 to 3.0.
A printing plate comprising a lithographic substrate coated with a photopolymerizable coating composition comprising
- (a) one or more ethylenically unsaturated polymerizable monomers or oligomers;
- (b) a dye or pigment;
- (c) a photoinitiator;
- (d) a diazonium salt;
- and
- (e) an ethylenically unsaturated, urethane-containing self-crosslinkable grafted cellulose ester polymer of the formula ##STR17## wherein R.sup.1 is a (meth)acrylate moiety of the formula ##STR18## R.sup.2 is a .alpha.-methylstyrene moiety of the formula ##STR19## R.sup.3 is independently H, ##STR20## x is 0.1 to 2.5 y is 0.1 to 2.0
- z is 0.1 to 2.0 and
- n is 30-250, provided that (x+y+z) is in the range of 0.3 to 3.0.
Dependencies are inferred from the claim text.