Patent ID: 6811952
Filing Date: 2004-11-02
Classification: G03F

Abstract:
A photopolymerization process which comprises exposing a photosensitive lithographic printing plate containing at least one of sensitizing dyes represented by the following general formula (I) to laser beam having a wavelength of not greater than 450 nm: wherein T represents OR, SR, N(R)2 or SO2R and at least one T is present in the ortho or para position of the vinyl group, with the proviso that when the site at which Y is connected to the phenyl ring is an oxygen atom, sulfur atom or nitrogen atom, T may not be present; X represents an oxygen atom, sulfur atom or NR; Y represents a nonmetallic atom group which forms a ring with the adjacent carbon atoms; and R's each represent a hydrogen atom or nonmetallic atom group and may be connected to each other; and then developing the photosensitive lithographic printing plate thus exposed with a non-silicate-based developer containing a nonionic compound represented by the following general formula (III):A-Wâ€ƒâ€ƒ(III) wherein A represents a hydrophobic organic group log P of which is not smaller than 1.5 as determined in the form of A-H; and W represents a nonionic hydrophilic organic group log P of which falls below 1.0 as determined in the form of W-H.