Patent ID: 7217499
Filing Date: 2007-05-15
Classification: B41C,B41N,C25D

Abstract:
1. A base plate for a lithographic printing plate, the base plate comprising a aluminum support, and a photosensitive layer for infrared laser on the aluminum support, wherein the photosensitive layer comprises: (A) an acid-decomposable compound obtainable by the addition reaction of a resinous polymer having one or more phenolic hydroxyl groups with a silane coupling agent of the following general formula (1) or (2), wherein X 1 represents a trimethoxysilyl or triethoxysilyl group; G 1 represents O or COO; R 1 and R 2 each independently represents a hydrogen atom or a methoxy group, but both of them are not hydrogen atoms at the same time; R 1 and R 2 may also be combined together to form a ring through an alkylenedioxy group; R 3 represents (CH 2 ) m , which may have a hydrocarbon side chain, wherein m is an integer of 3 or greater; X 2 represents a trimethoxysilyl, triethoxysilyl, chiorodimethylsilyl, dichloromethylsilyl or trichlorosilyl group; G 2 represents O or COO; R 4 represents a hydrogen atom or a straight-chain or branched alkyl group; and R 5 represents (CH 2 ) n which may have a hydrocarbon side chain, wherein n is an integer of 3 or greater; (B) an acid generator; (C) an infrared absorber; and (D) an alkali-soluble resin, wherein the aluminum support comprises an anodized aluminum plate and particles formed by treating a surface of the anodized aluminum plate with a treatment liquid comprising at least one metal fluoride compound, at least one metal phosphate salt, and at least one perchlorate.