UV-curable ink composition, method for producing bezel pattern of display substrate using same, and bezel pattern produced thereby

Patent metadata

Field	Value
Publication number	US-10227498-B2
Application number	US-201515514306-A
Country	US
Kind code	B2
Filing date	Sep 30, 2015
Priority date	Sep 26, 2014
Publication date	Mar 12, 2019
Grant date	Mar 12, 2019

Abstract

The present invention relates to a UV-curable ink composition, a method for producing a bezel pattern of a display substrate using same, and a bezel pattern produced thereby, the UV-curable ink composition comprising a colorant, an epoxy compound, an oxetane compound and a photopolymerization initiator, wherein a content ratio of the epoxy compound to the oxetane compound is 1:0.5 to 1:6, a taper angle after being cured is 0° to 30°, and optical density (OD) value is 0.05 to 2.5 per a film thickness of 1.0 μm.

First claim

The invention claimed is:

1. A UV-curable ink composition for forming a bezel pattern comprising a colorant, an epoxy compound, an oxetane compound, a photopolymerization initiator, and a surfactant,
wherein a content ratio of the epoxy compound to the oxetane compound is 1:3.45 to 1:6, a taper angle after being cured is 0° to 10°, and an optical density (OD) value after being cured is 0.25 to 2.5 per a film thickness of 1.0 μm.

2. The UV-curable ink composition of claim 1 , further comprising one or more selected from the group consisting of an adhesion promoter, a diluent, and a photosensitizer.

3. The UV-curable ink composition of claim 1 , wherein the oxetane compound comprises an oxetane compound having one oxetane ring and an oxetane compound having two oxetane rings.

4. The UV-curable ink composition of claim 3 , wherein a content ratio of the oxetane compound having one oxetane ring to the oxetane compound having two oxetane rings is from 1:16 to 1:3.

5. The UV-curable ink composition of claim 1 , wherein a content of the epoxy compound is 5 to 50 wt % with respect to the total weight of the UV-curable ink composition.

6. The UV-curable ink composition of claim 1 , wherein a content of the oxetane compound is 15 to 75 wt % with respect to the total weight of the UV-curable ink composition.

7. The UV-curable ink composition of claim 1 , wherein the photopolymerization initiator is an iodonium salt or a sulfonium salt.

8. The UV-curable ink composition of claim 1 , wherein a content of the photopolymerization initiator is 1 to 15 wt % with respect to the total weight of the UV-curable ink composition.

9. The UV-curable ink composition of claim 1 , wherein a content of the colorant is 1 to 15 wt % with respect to the total weight of the UV-curable ink composition.

10. The UV-curable ink composition of claim 2 , wherein a content of the diluent is 0 to 30 wt % with respect to the total weight of the UV-curable ink composition.

11. The UV-curable ink composition of claim 1 , wherein the surfactant is a fluorine-based surfactant.

12. The UV-curable ink composition of claim 11 , wherein the fluorine-based surfactant is contained in an amount of 0.1 to 5.0 wt % with respect to the total weight of the UV-curable in composition.

13. The UV-curable ink composition of claim 2 , wherein the photosensitizer is contained in an amount of 1 to 200 parts by weight with respect to 100 parts by weight of the photopolymerization initiator.

14. The UV-curable ink composition of claim 2 , wherein the adhesion promoter is an epoxy silane-based compound.

15. The UV-curable ink composition of claim 2 , wherein the adhesion promoter is contained in an amount of 0.1 to 15 wt % with respect to the total weight of the UV-curable ink composition.

16. The UV-curable ink composition of claim 1 , wherein a dose for curing the UV-curable ink composition is 1 to 10,000 mJ/cm 2 .

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

18. The UV-curable ink composition of claim 17 , wherein the UV-curable ink composition has a viscosity of 3 cP to 45 cP at 25° C.

19. The UV-curable ink composition of claim 1 , wherein the UV-curable ink composition is for forming a bezel pattern.

20. A method for producing a bezel pattern for a display substrate, comprising:
a) forming a bezel pattern on a substrate by using the UV-curable ink composition of claim 1 ; and
b) curing the bezel pattern.

21. The method of claim 20 , further comprising cleaning and drying the substrate prior to a) the forming of the bezel pattern.

22. The method of claim 21 , wherein the cleaning and drying of the substrate is carried out by one or more treatments selected from the group consisting of a wet surface treatment, a UV ozone treatment, and a normal pressure plasma treatment.

23. The method of claim 20 , wherein the method of forming the bezel pattern on the substrate in Step a) is a method selected from an inkjet printing, a gravure coating, and a reverse offset coating.

24. The method of claim 20 , wherein Step a) is carried out at a process temperature of 10° C. to 100° C.

25. The method of claim 24 , wherein Step a) is carried out at a process temperature of 20 ° C. to 70° C.

26. The method of claim 20 , wherein the bezel pattern has a thickness of 0.1 μm to 20 μm.

27. The method of claim 26 , wherein the bezel pattern has a thickness of 0.5 μm to 5 μm.

28. A bezel pattern for a display substrate, which is formed on a substrate by curing the UV-curable ink composition of claim 1 .

29. The bezel pattern of claim 28 , wherein the bezel pattern has a thickness of 0.1 μm to 20 μm.

30. The bezel pattern of claim 29 , wherein the bezel pattern has a thickness of 0.5 μm to 5 μm.

Assignees

• Lg Chemical Ltd

Inventors

• Park Sung-Eun
• Goo Yong-Sung
• Back Seung-A
• Kim Joon-Hyung

Classifications

• B41F17/006

  for printing on curved surfaces not otherwise provided for · CPC title

• C09D171/00

  Coating compositions based on polyethers obtained by reactions forming an ether link in the main chain (based on polyacetals C09D159/00; based on epoxy resins C09D163/00; based on polythioether-ethers C09D181/02; based on polyethersulfones C09D181/06); Coating compositions based on derivatives of such polymers · CPC title

• H05K1/092

  Dispersed materials, e.g. conductive pastes or inks · CPC title

• G09F9/00

  Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements (in which the variable information is permanently attached to a movable support G09F11/00; abacus G06C1/00; slide-rules G06G1/00) · CPC title

• C09D11/00

  Inks · CPC title