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US 8,133,651 B2Granted
Lithographic printing plate comprising alkaline soluble and alkaline insoluble polymeric binders
OwnerGary Ganghui Tenginventor
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Abstract
Negative lithographic printing plate having on a substrate a photosensitive layer comprising an alkaline soluble polymeric binder, an alkaline insoluble polymeric binder, a polymerizable monomer, and an initiator is described. The photosensitive layer is imagewise exposed with a radiation to cause hardening in the exposed areas, and then developed to remove the non-hardened areas. The combination of both alkaline soluble polymeric binder and alkaline insoluble polymeric binder in a photosensitive layer can give excellent combined durability, developability, and coatability.
Claims9
A negative lithographic printing plate comprising (i) a substrate;
- and (ii) a photosensitive layer comprising an alkaline soluble polymeric binder, an alkaline insoluble polymeric binder, a polymerizable monomer, and an initiator;
- wherein said photosensitive layer is capable of hardening upon exposure to a radiation having a wavelength selected from 200 to 1200 nm, said alkaline soluble polymeric binder has an acid number of at least 40 mg KOH/g, and said alkaline insoluble polymeric binder has an acid number of less than 35 mg KOH/g and is selected from the group consisting of polymethylmethacrylate, a copolymer of methyl methacrylate and butyl acrylate, and a copolymer of styrene and methyl methacrylate.
Dependencies are inferred from the claim text.