Negative-working lithographic printing plate precursors with IR dyes

US8632941B2 · kind B2 · utility

Assignee

• EASTMAN KODAK COMPANY · US

Inventors

• Domenico Balbinot · Osterode, DE
• Harald Baumann · Tuttlingen, DE
• Udo Dwars · Herzberg, DE
• Mathias Jarek · Northeim, DE
• James Matz · Fairport, US
• Christopher D. Simpson · Osterode, DE

Key dates

• Filing date: Sep 22, 2011
• Grant date: Jan 21, 2014
• Expiry date: Feb 6, 2032

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B41C2210/22
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

A lithographic printing plate precursor comprises an imageable layer comprising a free radically polymerizable component, an initiator composition capable of generating free radicals upon exposure to imaging infrared radiation, an infrared radiation absorbing dye that is defined by Structure (I) shown in the disclosure, which dyes comprise one or more ethylenically unsaturated polymerizable groups in an organic group that is attached to the methine chain. These infrared radiation absorbing dyes exhibit a reduced tendency to crystallize in the imageable layers in the presence of tetraaryl borate counter anions and therefore provide improved shelf life.