Method for forming bezel pattern using inkjet printing

Patent metadata

Field	Value
Publication number	US-10807396-B2
Application number	US-201716061323-A
Country	US
Kind code	B2
Filing date	Feb 24, 2017
Priority date	Apr 8, 2016
Publication date	Oct 20, 2020
Grant date	Oct 20, 2020

Abstract

The present invention relates to a method for forming a bezel pattern using inkjet printing, and according to the present invention, there is an advantage in that it is possible to form a bezel pattern which is smooth without a curing shrinkage when the bezel pattern is formed and has excellent adhesion strength to a base material, and accordingly it is possible to provide a bezel pattern which has excellent performance, durability, and chemical resistance and a display substrate including the same.

First claim

The invention claimed is:

1. A method for forming a bezel pattern using inkjet printing, the method comprising:
a) forming a bezel pattern on a substrate by inkjet printing on the substrate a UV-curable ink composition comprising;
a pigment dispersion;
a melamine acrylate oligomer;
an adhesion strength enhancer;
a binder solution; and

a photoinitiator;
b) rear surface curing the bezel pattern by irradiating the bezel pattern with a UV ray; and
c) heat-treating the rear surface-cured bezel pattern at a temperature between 150° C.-250° C. for 5-30 minutes.

2. The method of claim 1 , further comprising a step b′) surface curing the bezel pattern before carrying out the step c) after the step b).

3. The method of claim 1 , wherein the pigment dispersion comprises a pigment, a dispersing agent, and a first reactive monomer; and is comprised in an amount of 45 to 70 parts by weight based on 100 parts by weight of the UV-curable ink composition.

4. The method of claim 3 , wherein the pigment is comprised in an amount of 25 to 35 parts by weight based on 100 parts by weight of the pigment dispersion.

5. The method of claim 3 , wherein the first reactive monomer is one selected from the group consisting of 1,6-hexanediol diacrylate (HDDMA), hydroxypivalic acid neopentyl glycol diacrylate (HPNDA), trimethylolpropane triacrylate (TMPTA), pentaerythritol triacrylate, trimethylene propane triacrylate, pentaerythritol triacrylate, trimethylene propyl triacrylate, propoxylated glycerol triacrylate, and a mixture of two or more thereof.

6. The method of claim 1 , wherein the adhesion strength enhancer is 3-glycidoxypropyl trimethoxysilane.

7. The method of claim 1 , wherein the binder solution is composed of an epoxy-based resin and a second reactive monomer; and is comprised in an amount of 10 to 30 parts by weight based on 100 parts by weight of the UV-curable ink composition.

8. The method of claim 7 , wherein the second reactive monomer is an acrylate-based monomer, and is one selected from the group consisting of 2-hydroxyethyl acrylate (2-HEA), trimethylolpropane triacrylate (TMPTA), hydroxyethyl methacrylate (HEMA), hexanediol diacrylate (HDDA), hydroxypivalic acid neopentyl glycol diacrylate (HPNDA), tripropyleneglycol diacrylate (TPGDA), and a mixture of two or more thereof.

9. The method of claim 1 , wherein the oligomer is comprised in an amount of 5 to 15 parts by weight based on 100 parts by weight of the UV-curable ink composition.

10. The method of claim 1 , wherein the photoinitiator is one selected from the group consisting of 2-methyl-1-[4-(methylthio)phenyl]-2-(4-morpholinyl)-1-propanone (Irgacure® 907), isopropyl thioxanthone (Darocur® ITX), and a mixture thereof.

11. The method of claim 1 , wherein the UV-curable ink composition further comprises one or more selected from the group consisting of a surfactant and a polymerization inhibitor.

12. The method of claim 1 , wherein the UV-curable ink composition is cured by absorbing a UV ray with a wavelength range of 360 nm to 410 nm at a curing dose of 1,000 to 20,000 mJ/cm 2 .

13. The method of claim 1 , wherein the UV-curable ink composition has a viscosity of 1 cP to 50 cP at 25° C.

14. The method of claim 1 , wherein the polymerization inhibitor is monomethylether hydroquinone (MEHQ).

Assignees

• Lg Chemical Ltd

Inventors

• Yoo Jae-Hyun
• Kim Mi-Kyoung

Classifications

• B41M5/0023 Primary

  Digital printing methods characterised by the inks used (inks per se C09D11/00) · CPC title

• B41M7/0081 Primary

  using electromagnetic radiation or waves, e.g. ultraviolet radiation, electron beams · CPC title

• C09D11/38

  characterised by non-macromolecular additives other than solvents, pigments or dyes · CPC title

• C09D11/322

  Pigment inks · CPC title

• C09D11/326

  characterised by the pigment dispersant · CPC title