US 11,294,279 C1 (13,381st)
Lithographic printing plate precursor, and method for producing lithographic printing plate
Yohei Ishiji, Shizuoka (JP); Keisuke Nogoshi, Shizuoka (JP); and Takeshi Inasaki, Shizuoka (JP)
Filed by FUJIFILM Corporation, Tokyo (JP)
Assigned to FUJIFILM Corporation
Reexamination Request No. 90/015,548, Sep. 26, 2025.
Reexamination Certificate for Patent 11,294,279, issued Apr. 5, 2022, Appl. No. 16/599,394, Oct. 11, 2019.
Application 90/015,548 is a continuation of application No. PCT/JP2018/026239, filed on Jul. 11, 2018.
Claims priority of application No. 2017-137249 (JP), filed on Jul. 13, 2017.
Ex Parte Reexamination Certificate issued on Sep. 22, 2026.
Int. Cl. G03F 7/027 (2006.01); B41C 1/10 (2006.01)
CPC G03F 7/027 (2013.01) [B41C 1/1041 (2013.01); B41C 2201/10 (2013.01)]
AS A RESULT OF REEXAMINATION, IT HAS BEEN DETERMINED THAT:
The patentability of claims 1-9, 11-14, and 16-18 is confirmed.
Claims 10, 15, and 19 were not reexamined.
1. A method of preparing a lithographic printing plate, comprising
imagewise exposing a lithographic printing plate precursor, thereby forming an exposed portion and an unexposed portion, and
feeding at least one of printing ink or dampening water, thereby removing the unexposed portion, wherein
the lithographic printing plate precursor comprises an image recording layer on a hydrophilic support,
the image recording layer comprises a polymerization initiator, an infrared absorbent, a polymerizable compound, a polymer particle, and an acid color former,
the infrared absorbent comprises a compound represented by the following Formula 1, and
the difference between the highest occupied molecular orbital (HOMO) of the compound represented by Formula 1 and the highest occupied molecular orbital of the polymerization initiator is 0.57 eV or less:

OG Complex Work Unit Chemistry
wherein R1 and R2 each independently represents a hydrogen atom or an alkyl group, R1 and R2 are optionally mutually linked to form a ring, R3 to R6 each independently represents a hydrogen atom or an alkyl group, R7 and R8 each independently represents an alkyl group or an aryl group, Y1 and Y2 each independently represents 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 represents a group that forms a benzene ring or a naphthalene ring optionally having —X described below, A1 represents —NR9R10, —X1—L1, or—X described below, 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 where a bond with X1 is to be cleaved by heat or infrared exposure, Za represents a counter ion that neutralizes charge, and at least one of Ar1 or Ar2 has —X, X represents a halogen atom, —C(═O)—X2—R11, —C(═O)—NR12R13, —O—C(═O)—R14, —CN, —SO2NR15R16, or a per-fluoroalkyl group, X2 represents a single bond or an oxygen atom, R11 and R14 each independently represents an alkyl group or an aryl group, and R12, R13, R15 and R16 each independently represents a hydrogen atom, an alkyl group, or an aryl group.