US 12,187,025 B2
On-machine development type planographic printing plate precursor, method for preparing planographic printing plate, and planographic printing method
Kazuaki Enomoto, Shizuoka (JP); Natsumi Yokokawa, Shizuoka (JP); Akinori Fujita, Shizuoka (JP); Akira Sakaguchi, Shizuoka (JP); Yusuke Namba, Shizuoka (JP); and Ichiro Koyama, Shizuoka (JP)
Assigned to FUJIFILM Corporation, Tokyo (JP)
Filed by FUJIFILM Corporation, Tokyo (JP)
Filed on Dec. 23, 2021, as Appl. No. 17/561,004.
Application 17/561,004 is a continuation of application No. PCT/JP2020/025414, filed on Jun. 26, 2020.
Claims priority of application No. 2019-122479 (JP), filed on Jun. 28, 2019; application No. 2019-158812 (JP), filed on Aug. 30, 2019; application No. 2019-169808 (JP), filed on Sep. 18, 2019; application No. 2019-180573 (JP), filed on Sep. 30, 2019; and application No. 2020-015682 (JP), filed on Jan. 31, 2020.
Prior Publication US 2022/0111629 A1, Apr. 14, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. B41C 1/10 (2006.01)
CPC B41C 1/1016 (2013.01) [B41C 2201/02 (2013.01); B41C 2201/14 (2013.01); B41C 2210/04 (2013.01); B41C 2210/08 (2013.01); B41C 2210/22 (2013.01); B41C 2210/24 (2013.01)] 30 Claims
OG exemplary drawing
 
1. An on-machine development type planographic printing plate precursor, comprising:
a support; and
an image-recording layer on the support,
wherein the image-recording layer contains an initiator, an infrared absorber capable of donating electrons to the initiator, and a color-developing substance precursor having a lactone, lactam, sultone, or spiropyran skeleton,
in a case where the image-recording layer is exposed to an infrared laser with a wavelength of 830 nm at an energy density of 110 mJ/cm2, a brightness change ΔL of the image-recording layer before and after the exposure is 3.0 or more,
a molar light absorption coefficient e of a color-developing substance generated from the color-developing substance precursor is 35,000 or more,
a ring-opening rate of the color-developing substance precursor calculated by the following equation is 40 mol % to 99 mol %,
ring-opening rate=molar light absorption coefficient of the color-developing substance precursor to which 1 molar equivalent of acid is added/molar light absorption coefficient ε of a color-developing substance generated from the color-developing substance precursor×100,
a color-developing substance generated from the color-developing substance precursor has a maximum absorption wavelength of 500 nm to 650 nm in a wavelength range of 380 nm to 750 nm.