Negative-working imaging elements and methods of use

US8354216B2 · kind B2 · utility

Assignee

• EASTMAN KODAK COMPANY · US

Inventors

• Harald Baumann · Tuttlingen, DE
• Udo Dwars · Herzberg, DE
• Christopher D. Simpson · Osterode, DE
• Bernd Strehmel · Berlin, DE
• Michael Flugel · Osterode, DE

Key dates

• Filing date: Jul 15, 2008
• Grant date: Jan 15, 2013
• Expiry date: Jun 22, 2030

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B41C2210/266
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

Negative-working imageable elements such as lithographic printing plate precursors, include a free-radically polymerizable component, an initiator composition that is capable of generating free radicals sufficient to initiate polymerization of the free-radically polymerizable component upon exposure to imaging radiation in the presence of a radiation absorbing compound, a radiation absorbing compound, an aerobic free radical inhibitor, optionally a polymeric binder that is not a free radically polymerizable component, and an anaerobic free radical inhibitor. The molar ratio of the anaerobic free radical inhibitor to the aerobic free radical inhibitor is at least 1:1. This combination of inhibitors provides increased shelf life and good latent image stability particularly when the element includes a polymeric topcoat layer that functions as an oxygen barrier.