Patent ID: 11964466
Assignee: EASTMAN KODAK COMPANY
Field: Textile and paper machines (Mechanical engineering)
Classification: CPC B  C  G | IPC B  G

Claim 0:
1. A lithographic printing plate precursor comprising:
a substrate having a planar surface, and
an on-press developable radiation-sensitive imageable layer disposed over the planar surface of the substrate,
wherein the substrate comprises:
an aluminum-containing plate having a gained and etched planar surface;
an inner aluminum oxide layer disposed on the grained and etched planar surface, the inner aluminum oxide layer having an average dry thickness (Ti) of at least 650 nm and up to and including 3,000 nm, and comprising a multiplicity of inner micropores having an average inner micropore diameter (Di) of less than 15 nm;
an outer aluminum oxide layer disposed over the inner aluminum oxide layer, the outer aluminum oxide layer comprising a multiplicity of outer micropores having an average outer micropore diameter (Do) of at least 15 nm and up to and including 30 nm, and having an a:verage dry thickness (To) of at least 130 nm and up to and including 650 nm; and
a hydrophilic layer disposed on the outer aluminum oxide layer at a dry coverage of at least 0.0002 g/m2 and up to and including 0.1 g/m2, and which hydrophilic layer comprises one or more hydrophilic polymers, at least one of which hydrophilic polymers is a hydrophilic copolymer that comprises at least (a) recurring units comprising an amide group, and (b) recurring units comprising an —OM group that is directly connected to a phosphorus atom, wherein M represents a hydrogen, sodium, potassium, or aluminum atom.