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US 5,368,974 AGranted
Lithographic printing plates having a hydrophilic barrier layer comprised of a copolymer of vinylphosphonic acid and acrylamide overlying an aluminum support
AssigneeEastman Kodak Company
InventorsJohn E. Walls, Paul R. West
Life of this patent
Estimating the term…
Abstract
Improved lithographic printing plates are comprised of an aluminum support, a hydrophilic barrier layer comprised of a copolymer of about 40 to about 90 mole percent vinylphosphonic acid and about 10 to about 60 mole percent acrylamide overlying said support, and an image-forming layer capable of providing a lithographic printing surface overlying said barrier layer.
Claims10
A lithographic printing plate comprising:
- (1) an aluminum support;
- (2) a hydrophilic barrier layer;
- and
- (3) an image-forming layer that is capable of providing a lithographic printing surface;
- said hydrophilic barrier layer being in direct contact with said aluminum support and interposed between said aluminum support and said image-forming layer and being comprised of a copolymer of about 40 to about 90 mole percent vinylphosphonic acid and about 10 to about 60 mole percent acrylamide.
2 more elements
A method for the manufacture of a lithographic printing plate, which method comprises:
- providing an aluminum support material;
- forming on the surface of said aluminum support material a hydrophilic barrier layer comprising a copolymer of about 40 to about 90 mole percent vinylphosphonic acid and about 10 to about 60 mole percent acrylamide;
- and coating the surface of said hydrophilic barrier layer with a radiation-sensitive coating composition which is capable of forming a lithographic printing surface.
A method for the manufacture of a lithographic printing plate, which method comprises:
- providing a grained and anodized aluminum support material;
- forming on the grained and anodized surface of said aluminum support material by an electrochemical process a hydrophilic barrier layer comprising a copolymer of about 40 to about 90 mole percent vinylphosphonic acid and about 10 to about 60 mole percent acrylamide;
- and coating the surface of said hydrophilic barrier layer with a radiation-sensitive coating composition which is capable of forming a lithographic printing surface.
Dependencies are inferred from the claim text.