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CN-116209954-B - Photosensitive resin printing plate precursor and method for producing printing plate using same

CN116209954BCN 116209954 BCN116209954 BCN 116209954BCN-116209954-B

Abstract

The purpose of the present invention is to provide a photosensitive resin printing plate precursor which can inhibit peeling of a photosensitive resin layer. The photosensitive resin printing plate precursor is a photosensitive resin printing plate precursor comprising at least a support and a photosensitive resin layer, wherein the photosensitive resin layer comprises at least a polymer (A) having an olefinic double bond, a compound (B) having an olefinic double bond, and a photopolymerization initiator (C), the photosensitive resin layer comprises at least a first photosensitive resin layer comprising a printing surface and a second photosensitive resin layer comprising the inside of the photosensitive resin layer, and the equivalent F1 (g/eq) of the olefinic double bond of the component (A) in the first photosensitive resin layer is larger than the equivalent F2 (g/eq) of the olefinic double bond of the component (A) in the second photosensitive resin layer.

Inventors

  • DOBORI KENJI
  • You Nu
  • Guan Jiaoren

Assignees

  • 东丽株式会社

Dates

Publication Date
20260508
Application Date
20210726
Priority Date
20200914

Claims (15)

  1. 1. A photosensitive resin printing plate precursor having at least a support and a photosensitive resin layer, The photosensitive resin layer contains at least: A polymer (A) having an olefinic double bond, a compound (B) having an olefinic double bond, and a photopolymerization initiator (C); The photosensitive resin layer at least comprises a first photosensitive resin layer comprising a printing surface and a second photosensitive resin layer comprising the inside of the photosensitive resin layer; The first photosensitive resin layer and the second photosensitive resin layer each contain a polymer (A) having an olefinic double bond, a compound (B) having an olefinic double bond, and a photopolymerization initiator (C); The olefinic double bond equivalent F1 (g/eq) of the component (A-1) in the first photosensitive resin layer is greater than the olefinic double bond equivalent F2 (g/eq) of the component (A-2) in the second photosensitive resin layer.
  2. 2. The photosensitive resin printing plate precursor according to claim 1, wherein F1 is 1,000 (g/eq) or more and 19,000 (g/eq) or less.
  3. 3. The photosensitive resin printing plate precursor according to claim 1 or 2, wherein the ratio of F1 to F2 (F1/F2) is greater than 1.0 and 5.0 or less.
  4. 4. The photosensitive resin printing plate precursor according to claim 1 or 2, wherein the weight average molecular weight M1 of (a-1) is equal to or greater than the weight average molecular weight M2 of (a-2).
  5. 5. The photosensitive resin printing plate precursor according to claim 4, wherein M1 is 20,000 or more and 200,000 or less.
  6. 6. The photosensitive resin printing plate precursor according to claim 4, wherein the ratio of M1 to M2 (M1/M2) is 1.0 or more and 6.5 or less.
  7. 7. The photosensitive resin printing plate precursor according to claim 5, wherein the ratio of M1 to M2 (M1/M2) is 1.0 or more and 6.5 or less.
  8. 8. The photosensitive resin printing plate precursor according to claim 1 or 2, wherein the first photosensitive resin layer is adjacent to the second photosensitive resin layer.
  9. 9. The photosensitive resin printing plate precursor according to claim 1 or 2, wherein the thickness of the first photosensitive resin layer is 5 μm or more and 100 μm or less.
  10. 10. The photosensitive resin printing plate precursor according to claim 1 or 2, wherein the thickness of the second photosensitive resin layer is 100 μm or more and 2.0 mm or less.
  11. 11. The photosensitive resin printing plate precursor according to claim 1 or 2, which contains, as the component (a), polyvinyl alcohol, partially saponified polyvinyl alcohol and/or polyamide containing a tertiary nitrogen atom.
  12. 12. A method for producing a printing plate by using the photosensitive resin printing plate precursor according to any one of claims 1 to 11, comprising the steps of: an exposure step of irradiating at least the photosensitive resin layer of the photosensitive resin printing plate precursor with ultraviolet rays to photocuring an exposed portion of the photosensitive resin layer, and And a developing step of removing an uncured portion of the photosensitive resin layer using at least water and/or an organic solvent.
  13. 13. The method for producing a printing plate according to claim 12, wherein in the developing step, the uncured portion is eluted by a brush cleaner.
  14. 14. The method of manufacturing a printing plate according to claim 12 or 13, which is a printing plate for dry offset printing.
  15. 15. A dry offset printing process wherein two metal cans are printed using a printing plate obtained by the process of claim 14.

Description

Photosensitive resin printing plate precursor and method for producing printing plate using same Technical Field The present invention relates to a photosensitive resin printing plate precursor and a method for manufacturing a printing plate using the same. Background As a method of forming a relief on a photosensitive resin printing plate precursor, a method of selectively curing an image portion by irradiating ultraviolet rays to a photosensitive resin layer through an image mask or an original image film and removing an uncured portion by using a developer is generally used. As a technique for improving the printing durability of a photosensitive resin printing plate on which a relief is formed, a photosensitive resin printing plate precursor has been proposed which has at least a support and a photosensitive resin layer containing a partially saponified polyvinyl alcohol compound, a polyamide having basic nitrogen, a compound having an olefinic double bond, and a photopolymerization initiator, the photosensitive resin layer containing at least a lower layer and a print surface layer, the support, the lower layer, and the print surface layer being provided in this order, and the partially saponified polyvinyl alcohol compound having an average polymerization degree of 1200 to 2600 in the print surface layer and the partially saponified polyvinyl alcohol compound having an average polymerization degree of 400 to 800 in the lower layer (for example, see patent document 1). Prior art literature Patent literature Patent document 1 International publication No. 2017/038970 Disclosure of Invention Problems to be solved by the invention As is clear from the study of the present inventors, although printing durability is improved by the photosensitive resin printing plate precursor described in patent document 1, there is a problem that interlayer peeling is likely to occur locally or entirely in the photosensitive resin layer in the plate making step of forming the relief. This is considered to be because the partially saponified polyvinyl alcohol compound in the print surface layer has a high crosslinking density, and thus the photo-curing of the partially saponified polyvinyl alcohol compound in the lower layer becomes difficult due to the preferential progress of the photo-curing of the partially saponified polyvinyl alcohol compound in the print surface layer with each other by exposure. In this case, if the developer penetrates between the printing surface layer and the lower layer by development, the printing surface layer is easily peeled into a film shape, and interlayer peeling occurs. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a photosensitive resin printing plate precursor capable of suppressing peeling of a photosensitive resin layer. Means for solving the problems In order to achieve the above object, the present invention mainly has the following. A photosensitive resin printing plate precursor having at least a support and a photosensitive resin layer, The photosensitive resin layer contains at least: a polymer (A) having an olefinic double bond, a compound (B) having an olefinic double bond, and a photopolymerization initiator (C), The photosensitive resin layer has at least a first photosensitive resin layer having a printing surface and a second photosensitive resin layer having an inner portion of the photosensitive resin layer, The olefinic double bond equivalent F1 (g/eq) of the component (A-1) in the first photosensitive resin layer is greater than the olefinic double bond equivalent F2 (g/eq) of the component (A-2) in the second photosensitive resin layer. Effects of the invention According to the photosensitive resin printing plate precursor of the present invention, peeling of the photosensitive resin layer can be suppressed. Detailed Description The photosensitive resin printing plate precursor of the present invention (hereinafter, sometimes referred to as "printing plate precursor") has at least a support and a photosensitive resin layer. Here, the photosensitive resin layer is a layer containing a polymer (a) having an olefinic double bond, a compound (B) having an olefinic double bond, and a photopolymerization initiator (C), which will be described later. By providing the photosensitive resin layer, for example, ultraviolet rays can be imagewise irradiated, and a desired relief can be formed on the support. The photosensitive resin layer may have 2 or more layers. The support has a function of holding the photosensitive resin layer and the relief. In the printing plate precursor of the present invention, the photosensitive resin layer contains at least a polymer (a) having an olefinic double bond (hereinafter, sometimes referred to as "a component"), a compound (B) having an olefinic double bond (hereinafter, sometimes referred to as "B component"), and a photopolymerization initiator (C) (hereinafte