Lithographic printing plate comprising hydrophilic layer of polyvinylacetate crosslinked with tetraethylorthosilicate
AssigneeEastman Kodak Company
InventorHenry C. Staehle
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Abstract
A method of providing a printing plate comprises coating on a support a layer having a hydrophilic surface comprising the homogeneous reaction product of hydrolyzed polyvinyl acetate and hydrolyzed tetraethyl orthosilicate. The coating may also contain pigments such as titanium dioxide and the like. A printing plate is provided having a support having thereon a layer having a hydrophilic surface and over the layer a silver precipitating layer, preferably comprising nickel sulfide and silver iodide. An image is provided in the silver precipitating layer by diffusion transfer and treated with a thiol or similar sulfur-containing material to improve the ink-water balance of the plate.
Claims16
A lithographic element comprising a support having thereon a layer having a hydrophilic surface, said layer comprising a crosslinked material that is substantially free from discrete particles and comprises hydrolyzed polyvinyl acetate crosslinked with hydrolyzed tetraethylorthosilicate, said element having thereon an image-bearing layer or an image forming layer.
A lithographic element comprising a support having thereon a layer having a hydrophilic surface, the layer comprising (a) a crosslinked material that is substantially free from discrete particles and comprises hydrolyzed polyvinyl acetate crosslinked with hydrolyzed tetraethylorthosilicate and (b) a pigment, the element further comprising a silver precipitant located in a layer contiguous to said crosslinked material or located in said crosslinked material.
Dependencies are inferred from the claim text.