Lithographic process involving on press development

Details Lithographic process involving on press development Lithographic process involving on press development

2004-06-02

2008-10-28

Chu, John S (Department: 1795)

Radiation imagery chemistry: process, composition, or product th

Microcapsule, process, composition, or product

C430S270100, C430S281100, C430S302000, C101S467000

Reexamination Certificate

active

07442485

ABSTRACT:
A lithographic printing process comprises the steps of: imagewise exposing to infrared light a presensitized lithographic plate which comprises a hydrophilic support and an image-forming layer containing an infrared absorbing agent, a polymerization initiator and a binder polymer to polymerize the polymerizable compound within the exposed area; removing the image-forming layer within the unexposed area while mounting the lithographic plate on a cylinder of a printing press; and then printing with the lithographic plate while mounting the lithographic plate on the cylinder of the printing press. The polymerization initiator is a salt of an anion with a sulfonium ion. According to the present invention, a specific anion or a specific sulfonium ion is used in the polymerization initiator.

REFERENCES:
patent: 6171748 (2001-01-01), Tanaka et al.
patent: 6576401 (2003-06-01), Teng
patent: 7090957 (2006-08-01), Shimada et al.
patent: 2003/0022095 (2003-01-01), Kai et al.

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