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1. (WO2018160379) LITHOGRAPHIC PRINTING PLATE PRECURSORS AND METHOD OF USE

Pub. No.:    WO/2018/160379    International Application No.:    PCT/US2018/018662
Publication Date: Sat Sep 08 01:59:59 CEST 2018 International Filing Date: Wed Feb 21 00:59:59 CET 2018
IPC: B41N 3/03
B41N 1/08
C25D 11/12
B41C 1/10
Applicants: EASTMAN KODAK COMPANY
Inventors: MERKA, Oliver
KEMMLING, Jan-Phillip
BLUM, Oliver, Richard
UHL, Benedikt
Title: LITHOGRAPHIC PRINTING PLATE PRECURSORS AND METHOD OF USE
Abstract:
Lithographic printing plate precursors are prepared with a unique substrate and one or more radiation-sensitive imageable layers. The inventive substrate is prepared by two separate anodizing processes to provide an inner aluminum oxide layer having an average dry thickness (Ti) of 650-3,000 nm and a multiplicity of inner micropores having an average inner micropore diameter (Di) of ≤ 15 nm. A formed outer aluminum oxide layer comprises a multiplicity of outer micropores having an average outer micropore diameter (Do) of 15-30 nm; an average dry thickness (To) of 130-650 nm; and a micropore density (Co) of 500-3,000 micropores/μm2. The ratio of D0 to Di is greater than 1.1 : 1, and Do in nanometers and the outer aluminum oxide layer micropore density (Co) in micropores/μm2, are further defined by the outer aluminum oxide layer porosity (Po) according to the following equation: 0.3 ≤ Po ≤ 0.8 wherein Po is 3.14(Co)(Do2)/4,000,000.