Method of producing planographic printing plate, and planographic printing plate

Abstract

The present invention provides a method of producing a planographic printing plate, including ejecting a photo-polymerizable ink composition containing at least one polymerization-initiating substance having a molar extinction coefficient of 1,000 M−1cm−1 or more in a wavelength range of 400 nm to 700 nm on a support, and polymerizing and hardening the ink deposited on the support by irradiation of the ink with light from a light source having an output of 1,000 W or less, and a planographic printing plate obtained by the method.

Description

Claims

1. A method of producing a planographic printing plate, comprising ejecting a photo-polymerizable ink composition containing a polymerization-initiating substance having a molar extinction coefficient of 1,000 M−1cm−1 or more in a wavelength range of 400 nm to 700 nm on a support, and polymerizing and hardening ink deposited on the support by irradiation of the ink with light from a light source having an output of 1,000 W or less.

2. The method of claim 1, wherein the molar extinction coefficient of the polymerization-initiating substance in a wavelength range of 400 nm to 450 nm is 3,000 M−1cm−1 or more.

3. The method of claim 1, wherein the molar extinction coefficient of the polymerization-initiating substance in a wavelength range of 400 nm to 450 nm is 5,000 M−1cm−1 or more.

4. The method of claim 1, wherein the molar extinction coefficient of the polymerization-initiating substance at a wavelength of 405 nm is 5,000 M−1cm−1 or more.

5. The method of claim 1, wherein the polymerization-initiating substance comprises a 2,4,6-substituted-1,3,5-triazine compound represented by the following Formula (I):

6. The method of claim 1, wherein the polymerization-initiating substance comprises a diazonium salt represented by the following Formula (II): Ar21—N+≡N Z21−  (II)wherein Ar21 represents an aryl group that has 20 or fewer carbon atoms and that may have at least one substituent; and Z21− represents a counter ion selected from the group consisting of halide, perchlorate, tetrafluoroborate, hexafluorophosphate, and sulfonate ions.

7. The method of claim 1, wherein the polymerization-initiating substance comprises a compound represented by the following Formula (III):

8. The method of claim 1, wherein the polymerization-initiating substance comprises a compound represented by the following Formula (IV):

9. A planographic printing plate, comprising an image prepared by ejecting a photo-polymerizable ink composition containing a polymerization-initiating substance having a molar extinction coefficient of 1,000 M−1cm−1 or more in a wavelength range of 400 nm to 700 nm on a support, and polymerizing and hardening the ink composition deposited on the support by irradiation of the ink composition with light from a light source having an output of 1,000 W or less.

10. The planographic printing plate of claim 9, wherein the molar extinction coefficient of the polymerization-initiating substance in a wavelength range of 400 nm to 450 nm is 3,000 M−1cm−1 or more.

11. The planographic printing plate of claim 9, wherein the molar extinction coefficient of the polymerization-initiating substance in a wavelength range of 400 nm to 450 nm is 5,000 M−1cm−1 or more.

12. The planographic printing plate of claim 9, wherein the molar extinction coefficient of the polymerization-initiating substance at a wavelength of 405 nm is 5,000 M−1cm−1 or more.

13. The planographic printing plate of claim 9, wherein the polymerization-initiating substance comprises a 2,4,6-substituted-1,3,5-triazine compound represented by the following Formula (I):

14. The planographic printing plate of claim 9, wherein the polymerization-initiating substance comprises a diazonium salt represented by the following Formula (II): Ar21—N+≡N Z21 −  (II)wherein Ar21 represents an aryl group that has 20 or fewer carbon atoms and that may have at least one substituent; and Z21− represents a counter ion selected from the group consisting of halide, perchlorate, tetrafluoroborate, hexafluorophosphate, and sulfonate ions.

15. The planographic printing plate of claim 9, wherein the polymerization-initiating substance comprises a compound represented by the following Formula (III):

16. The planographic printing plate of claim 9, wherein the polymerization-initiating substance comprises a compound represented by the following Formula (IV):