Gravure printing plate of photocurable material

Claim 1

THe process of forming a gravure printing plate which comprises filling the cells of a grid-etched metal cylinder with a composition consisting essentially of (1) 98 to 2 percent by weight of said composition of a polyene containing at least 2 reactive unsaturated carbon to carbon bonds per molecule, (2) 2 to 98 percent by weight of said composition of a polythiol containing at least 2 thiol groups per molecule, the total combined functionality of (a) the reactive unsaturated carbon to carbon bonds per molecule in the polyene and (b) the thiol groups per molecule in the polythiol being greater than 4, and (3) 0.0005 to 50 percent by weight of said composition of a photosensitizer, covering the thus filled cells with a film transparent to actinic radiation exposing said composition to actinic radiation through an image-bearing continuous tone negative transparency thereby causing portions of the composition exposed to actinic radiation to adhere to the film, and form a solidified cured reverse image relative to said transparency, stripping the film and the adhering cured composition from the cylinder and exposing the residual portion of the composition in the cells of the cylinder to actinic radiation.