Ink composition

Abstract

The present application relates to an ink composition comprising a glycidyl ether compound and a method for forming an organic layer using the same, and provides an ink composition capable of forming an organic layer and adjusting haze in a curing process for an intended use, and a method of forming an organic layer using the same.

Claims

1. An ink composition comprising a glycidyl ether compound in an amount of 7 to 38 wt % of the total composition, wherein haze of the ink composition is adjusted by UV irradiation, and wherein the haze of the ink composition is increased by increasing UV light quantity.

2. The ink composition according to claim 1, wherein a haze value for the ink composition at a time point f after being irradiated with UV rays at a UV light quantity of 7600 mJ/cm.sup.2 or more from a random time point i is larger than a haze value for the ink composition at the time point i.

3. The ink composition according to claim 1, wherein a haze value H.sub.300 upon irradiation at a light quantity of 300 mJ/cm.sup.2 is smaller than a haze value H.sub.8000 upon irradiation at a light quantity of 8000 mJ/cm.sup.2.

4. The ink composition according to claim 1, further comprising an epoxy compound having cyclic structures.

5. The ink composition according to claim 4, wherein the epoxy compound having cyclic structures is at least bifunctional.

6. The ink composition according to claim 4, wherein the epoxy compound having cyclic structures has three to ten constituent atoms of a ring.

7. The ink composition according to claim 4, wherein the epoxy compound having cyclic structures is included in an amount of 40 to 150 parts by weight relative to 100 parts by weight of the glycidyl ether compound.

8. The ink composition according to claim 1, further comprising a compound having an oxetane group.

9. The ink composition according to claim 8, wherein the compound having an oxetane group has a weight average molecular weight in a range of 150 to 1,000 g/mol.

10. The ink composition according to claim 8, wherein the compound having an oxetane group is included in an amount of 150 to 300 parts by weight relative to 100 parts by weight of the glycidyl ether compound.

11. The ink composition according to claim 1, further comprising a photoinitiator.

12. The ink composition according to claim 1, wherein the composition is solventless.

13. The ink composition according to claim 1, wherein the haze value measured according to JIS K7105 standard in cured state is in a range of 0.1 to 50%.

14. The ink composition according to claim 1, wherein the composition is applied to an encapsulating layer of an organic electronic element or a light extraction layer of an organic electronic element.

15. The ink composition according to claim 3, wherein the ratio (H.sub.8000/H.sub.300) of the H.sub.8000 haze value to the H.sub.300 haze value is in a range of 15 to 100.

16. A method for forming an organic layer comprising irradiating the ink composition of claim 1 with UV rays.

17. The method for forming an organic layer according to claim 16, wherein the UV rays have a light quantity in a range of 20 mJ/cm.sup.2 to 15,000 mJ/cm.sup.2.

18. The ink composition according to claim 1, wherein the glycidyl ether compound includes aliphatic glycidyl ether, benzyl glycidyl ether, 1,4-butanediol diglycidyl ether, ethylene glycol diglycidyl ether, 1,6-hexanediol diglycidyl ether, propylene glycol diglycidyl ether, diethylene glycol diglycidyl ether, n-butyl glycidyl ether, 2-ethylhexyl glycidyl ether, or neopentyl glycol diglycidyl ether.

Description

BEST MODE

(1) Hereinafter, the present invention will be described in more detail through Examples according to the present invention and Comparative Examples not complying with the present invention, but the scope of the present invention is not limited by the following examples.

(2) Preparation of Ink Composition

(3) A benzyl glycidyl ether compound and an n-butyl glycidyl ether compound were used as glycidyl ether compounds, an alicyclic epoxy compound (Celloxide 2021P from Daicel) was used as an epoxy compound having cyclic structures in the molecular structure, and OXT-221 from TOAGOSEI Co., Ltd. was used as an oxetane group-containing compound. A photoinitiator having a triphenylsulfonium salt (UV693 from TETRA CHEM) was used as a photoinitiator, 9,10-dibutoxyanthracene was used as a photosensitizer, and 2,6-di-tert-butyl-p-cresol (BHT from SIGMA aldrich) was used as a heat stabilizer.

Examples 1 to 3 and Comparative Examples 1 to 4

(4) The respective components were put into a mixing container in the weight ratios shown in Table 1 below, and in the mixing container, a uniform ink composition was prepared using a planetary mixer (KK-250s from Kurabo).

(5) TABLE-US-00001 TABLE 1 Example Comparative Example 1 2 3 1 2 3 4 Benzyl glycidyl ether 25 — — — — 5 40 n-Butyl glycidyl ether — 25 20 — — — — Celloxide 2021P 15 15 20 20 30 15 15 OXT-221 55.95 55.95 55.95 75.95 65.95 79.95 40.95 UV693 3 3 3 3 3 3 3 9,10- 1 1 1 1 1 1 1 Dibutoxyanthracene BHT 0.05 0.05 0.05 0.05 0.05 0.05 0.05

(6) 1. Haze Measurement

(7) The ink compositions prepared in Examples and Comparative Examples above were each spin-coated on a 50 mm×50 mm LCD glass to form an organic layer having a thickness of 8 μm. Thereafter, the light quantity was adjusted with time using Pheseon UV 395 nm LED.

(8) It was irradiated with UV rays in a state where the curing atmosphere was maintained in an N.sub.2 purged state and 10% relative humidity.

(9) The light quantity was measured using ETT UV Power Puck II and it was irradiated with light quantities from 300 mJ/cm.sup.2 to 8000 mJ/cm.sup.2 according to the irradiation time after being fixed at a light intensity of 1000 mW/cm.sup.2.

(10) For the organic layer cured through the above process, the haze was measured according to JIS K7105 standard by using HM-150 and using air as a reference, and the results were shown in Table 2 below. The unit of haze is %, which was omitted in Table 2.

(11) TABLE-US-00002 TABLE 2 Light quantity Example Comparative Example (mJ/cm.sup.2) 1 2 3 1 2 3 4 300 0.17 0.15 0.12 0.12 0.18 0.17 Not 500 0.34 0.22 0.11 0.12 0.15 0.16 measurable 1000 0.5 0.7 0.85 0.14 0.13 0.18 2000 1.05 1.02 0.15 0.13 0.15 0.12 4000 5.29 1.31 0.88 0.15 0.16 0.19 8000 13.28 3.05 3.15 0.12 0.17 0.16

(12) In Comparative Example 4, measurement of haze was impossible due to insufficient curing.