Printing plate, method of manufacturing the same, and method of manufacturing printed matter using the same

Patent metadata

Field	Value
Publication number	US-11466165-B2
Application number	US-201916982249-A
Country	US
Kind code	B2
Filing date	Apr 17, 2019
Priority date	Apr 19, 2018
Publication date	Oct 11, 2022
Grant date	Oct 11, 2022

Abstract

The present invention relates to a printing plate including a first silicone layer and a second silicone layer which have different ink acceptabilities on a support. An object of the present invention is to provide a printing plate that dispenses with a development step and that has excellent image reproducibility, ink repellency, ink acceptability, and printing durability.

First claim

The invention claimed is:

1. A printing plate comprising an ink repellent first silicone layer and an ink acceptive second silicone layer in this order on a support, wherein
the first silicone layer and the second silicone layer comprise 60% by mass or more of a cross-linked siloxane compound,
the mean modulus of elasticity of the first silicone layer is 0.001 to 10 MPa, and
the mean modulus of elasticity of the second silicone layer is 60 to 2,000 MPa.

2. The printing plate according to claim 1 , wherein the difference between the mean modulus of elasticity of the first silicone layer and the mean modulus of elasticity of the second silicone layer is 50 to 1,900 MPa.

3. The printing plate according to claim 1 , wherein when 12 μl of dimethyl silicone oil with a liquid viscosity of 20 cSt is contacted with the surface of the second silicone layer, the spot diameter 10 minutes after the contact is 20 to 37 mm.

4. The printing plate according to claim 1 , wherein the mean film thickness of the second silicone layer is 0.1 to 5 μm.

5. The printing plate according to claim 1 , wherein the silicon concentration in the second silicone layer is 25 to 50% by mass.

6. The printing plate according to claim 1 , wherein the mean film thickness of the first silicone layer is 3 to 30 μm.

7. The printing plate according to claim 1 , wherein the first silicone layer comprises a compound having a vinyl group.

8. The printing plate according to claim 1 , wherein the first silicone layer comprises 5 to 40% by mass of a liquid having a surface tension at 25° C. of 30 mN/m or less.

9. A method of manufacturing the printing plate according to claim 1 , comprising:
applying a composition for forming a second silicone layer on the entire surface of the first silicone layer provided on a support to provide a second silicone layer;
irradiating the resultant from the side of the second silicone layer with a laser beam; and
ablating the second silicone layer, or the second silicone layer and the upper portion of the first silicone layer, in the laser-irradiated area.

10. The method of manufacturing the printing plate according to claim 9 , wherein the laser is a carbon dioxide gas laser or a high-power UV laser.

11. A method of manufacturing printed matter on a printing object medium, which comprises the step of applying an ink on the surface of the printing plate of claim 1 , and transferring the ink from the printing plate to the printing object medium directly or via a blanket.

12. The method of manufacturing printed matter according to claim 11 , wherein the ink is an active energy ray curing ink.

13. The method of manufacturing printed matter according to claim 11 , wherein the ink is a water-soluble ink.

14. The method of manufacturing printed matter according to claim 11 , wherein the printing object medium is non-absorptive for the ink component.

15. The method of manufacturing printed matter according to claim 11 , wherein the printing object medium is a food packaging base material.

Assignees

• Toray Industries

Inventors

• Iihara Akihiro
• Inoue Takejiro

Classifications

• B41C1/1016

  characterised by structural details, e.g. protective layers, backcoat layers or several imaging layers · CPC title

• B41C1/1033 Primary

  by laser or spark ablation · CPC title

• B41C2201/02

  Cover layers; Protective layers · CPC title

• C09D11/102

  containing macromolecular compounds obtained by reactions other than those only involving unsaturated carbon-to-carbon bonds · CPC title

• C09D11/037

  characterised by the pigment · CPC title