Printing plates from polymer with terminal unsaturation
AssigneeHercules Incorporated
InventorRudolph L. Pohl
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Abstract
It has been found that excellent quality photopolymer printing plates having hardness, flexibility, resilience, abrasion resistance and resistance to alcohol-based inks can be prepared from photopolymer compositions comprising a liquid polymer containing at least two terminal olefin groups attached to the polymer through a combination of at least two ether, thioether, ester, keto or amide groups, from about 1 to about 50% by weight based on the polymer of at least one ethylenically unsaturated monomer, from about 0.1 to about 10% by weight of a photoinitiator and about 0.01 to about 2% of a stabilizer.
Claims10
A photopolymer composition comprising (1) a liquid terminal olefinically unsaturated linear polymer having a molecular weight in the range of from 1,000 to 20,000, selected from polymers having the structure ##STR18## where X is selected from --O--, --S--, ##STR19## and --NH-- groups;
- Y is selected from --O--CH.sub.2 --CH.dbd.CH.sub.2 and ##STR20## R' is selected from --H and --CH.sub.3 groups;
- Z is selected from ##STR21## where R" is selected from --H, --CH.sub.3 and ##STR22## and P is a polymer residue selected from homopolymers of butadiene, isoprene, chloroprene, styrene, isobutylene, ethylene, and copolymers of butadiene with acrylonitrile, butadiene with styrene, butadiene with isoprene, ethylene with neohexene, isobutylene with styrene, isobutylene with acrylonitrile, and the corresponding saturated residues;
- (2) from about 1 to about 50% by weight based on the weight of the polymer of at least one ethylenically unsaturated monomer selected from acrylonitrile, methacrylonitrile, styrene, methyl substituted styrene, N-vinyl pyrrolidone, and monomers containing one or more ##STR23## wherein R is hydrogen or a C.sub.1 -C.sub.3 alkyl group;
- (3) from about 0.1 to about 10% by weight based on the weight of the polymer of a photoinitiator;
- and (4) from about 0.01 to about 2% by weight based on the weight of the polymer of a stabilizer.
Dependencies are inferred from the claim text.