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US 4,170,687 AGranted
Planographic printing plate for dry printing
AssigneeGestetner Limited
InventorsLeonard A. Spicer, Derek J. McGee, Ian H. Elson
Life of this patent
Estimating the term…
Abstract
Planographic printing plates for use without fountain solution, and especially suitable for imaging with an electrophotographic toner, have a surface containing a fluorinated polyurethane. In use only the image areas accept ink.
Claims13
A planographic printing plate comprising a support sheet having an ink-repellent coating containing 0.5 to 15%, by weight of the said coating, of a fluorinated polyurethane obtained by reaction of a fluorinated polyol and a non-fluorinated polyol with a polyisocyanate, and the balance to 100% of a non-fluorinated film-forming synthetic resinous material.
Dependencies are inferred from the claim text.