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US 6,632,584 B1Granted
Laser-imageable printing members and methods for wet lithographic printing
AssigneeCreo Inc.
InventorDavid A. Morgan
Life of this patent
Estimating the term…
Abstract
A thermosensitive composition consisting of a mixture of polyacrylic acid, a salt of a long chain fatty acid such as silver behenate, an infra-red absorbent and modifiers such as additional polymers and fillers. Both the water solubility and affinity to water and oil changed when composition is heated.
Claims27
A negative working wet printing member imageable by laser radiation, said member comprising:
- (a) a hydrophilic surface layer comprising one or more polymers and an absorber, said absorber being characterized by absorption of said laser radiation and said surface layer being characterized by non-ablative absorption of said laser radiation;
- (b) a substrate underlying said surface layer;
- wherein said surface layer comprises metal salts of organic acids, and poly(meth)acryloyl polymer binder.
A process for forming a negative working wet printing member imageable by laser radiation, said member comprising:
- a hydrophilic surface layer comprising one or more polymers and an absorber, said absorber being characterized by absorption of said laser radiation and said surface layer being characterized by non-ablative absorption of said laser radiation;
- a substrate underlying said surface layer;
- wherein the surface layer comprises metal salts of organic acids, polymer binder, and an acryloyl composition and the member is addressed by a laser to alter the properties of the surface layer.
A negative working wet printing member imageable by laser radiation, said member comprising:
- (d) a hydrophilic surface layer comprising one or more polymers and an absorber, said absorber being characterized by absorption of said laser radiation and said surface layer being characterized by non-ablative absorption of said laser radiation;
- (b) a substrate underlying said surface layer;
- wherein said surface layer comprises metal salts of organic acids, polymer binder, and an acryloyl compound.
Dependencies are inferred from the claim text.