US 12,214,582 B2
On-press development type lithographic printing plate precursor,method of preparing lithographic printing plate, and lithographic printing method
Kazuaki Enomoto, Shizuoka (JP); Akira Yamamoto, Shizuoka (JP); Yusuke Namba, Shizuoka (JP); and Keisuke Nogoshi, Shizuoka (JP)
Assigned to FUJIFILM Corporation, Tokyo (JP)
Filed by FUJIFILM Corporation, Tokyo (JP)
Filed on Nov. 28, 2022, as Appl. No. 18/059,256.
Application 18/059,256 is a continuation of application No. PCT/JP2021/019462, filed on May 21, 2021.
Claims priority of application No. 2020-095076 (JP), filed on May 29, 2020; and application No. 2020-124464 (JP), filed on Jul. 21, 2020.
Prior Publication US 2023/0127702 A1, Apr. 27, 2023
Int. Cl. B41C 1/10 (2006.01); G03F 7/004 (2006.01); G03F 7/029 (2006.01); G03F 7/031 (2006.01); G03F 7/033 (2006.01)
CPC B41C 1/1016 (2013.01) [G03F 7/0045 (2013.01); G03F 7/029 (2013.01); G03F 7/031 (2013.01); G03F 7/033 (2013.01); B41C 2210/22 (2013.01); B41C 2210/24 (2013.01)] 17 Claims
OG exemplary drawing
 
1. An on-press development type lithographic printing plate precursor, comprising, in the following order:
a support;
an image-recording layer; and
an outermost layer,
wherein the image-recording layer comprises an infrared absorber, an electron-accepting polymerization initiator, and a polymerizable compound,
LUMO of the electron-accepting polymerization initiator-LUMO of the infrared absorber is 0.45 eV or more,
the outermost layer comprises a discoloring compound, and
the infrared absorber comprises a compound represented by Formula 1,

OG Complex Work Unit Chemistry
in Formula 1, R1 and R2 each independently represent a hydrogen atom or an alkyl group, R1 and R2 may be linked to each other to form a ring, R3 to R6 each independently represent a hydrogen atom or an alkyl group, R7 and R8 each independently represent an alkyl group or an aryl group, Y1 and Y2 each independently represent an oxygen atom, a sulfur atom, —NR0—, or a dialkylmethylene group, R0 represents a hydrogen atom, an alkyl group, or an aryl group, Ar1 and Ar2 each independently represent a group forming a benzene ring or a naphthalene ring which may have a group represented by Formula 2 that will be described later, at least one of Ar1 or Ar2 comprises a bromine atom, A1 represents —NR9R10, —X1-L1, or a group represented by Formula 2 that will be described later, R9 and R10 each independently represent an alkyl group, an aryl group, an alkoxycarbonyl group, or an arylsulfonyl group, X1 represents an oxygen atom or a sulfur atom, L1 represents a hydrocarbon group, a heteroaryl group, or a group that undergoes bond cleavage from X1 by heat or exposure to infrared, Za represents a counterion that neutralizes charge, and at least one of Ar1 or Ar2 has a group represented by Formula 2,
—X  Formula 2
in Formula 2, X represents a halogen atom, —C(═O)—X2—R11, —C(═O)—NR12R13, —O—C(═O)—R14, —CN, —SO2NR15R16, or a perfluoroalkyl group, X2 represents a single bond or an oxygen atom, R11 and R14 each independently represent an alkyl group or an aryl group, and R12, R13, R15, and R16 each independently represent a hydrogen atom, an alkyl group, or an aryl group.