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US 3,964,389 AGranted
Printing plate by laser transfer
AssigneeScott Paper Company
InventorJohn O. H. Peterson
Life of this patent
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Abstract
Material is transferred by a laser beam from a transparent carrier film to a lithographic surface, thereby producing a planographic printing plate and a film having clear areas corresponding to the image on the plate.
Claims1
The method of making an imaged printing plate comprising the steps of:
- providing a transparent substrate having thereon a coating comprising
- a. particles which absorb laser energy
- b. a self-oxidizing binder and
- c. a cros-linking agent or a cross-linking agent in combination with a cross-linkable resin
- placing said coating in intimate contact with a lithographic printing surface,
- selectively transferring the coating to said lithograhic printing surface by directing laser energy through the film to the surface,
- and cross-linking the binder or resin by heating.
4 more elements
Dependencies are inferred from the claim text.