Light-diffusing barrier film

Patent metadata

Field	Value
Publication number	US-11508937-B2
Application number	US-201917047508-A
Country	US
Kind code	B2
Filing date	Apr 17, 2019
Priority date	Apr 17, 2018
Publication date	Nov 22, 2022
Grant date	Nov 22, 2022

Abstract

Provided is a light-diffusing barrier film. The film is an integral film comprising a barrier layer, a base layer and a light-diffusing layer, sequentially. The film can prevent moisture penetration into a device such as an organic light emitting device, and also imparts a light-diffusing function to the device. In particular, the film can have excellent moisture blocking properties even after a roll-to-roll process.

First claim

The invention claimed is:

1. A light-diffusive barrier film comprising a light-diffusing layer, a base layer and a barrier layer sequentially,
wherein a first side (S 1 ) opposite to a second side of the light-diffusing layer facing the base layer has irregularities with surface roughness (Rt) in a range of 0.1 to 6 μm,
wherein the light-diffusing layer is formed from a coating composition comprising 10 parts by weight or more of particles relative to 100 parts by weight of a curable resin,
wherein the size of the particles is 500 nm or more,
wherein the surface roughness (Rt) means a distance between the highest point (H1) and the lowest point (H2), that is, a height difference (ΔH=H1−H2), when a layer, which is intended to measure the surface roughness, is observed in the direction normal to the surface,
wherein a water vapor transmission change rate calculated by the following equation satisfies 30% or less:
Water vapor transmission change rate (%)={( B−A )/ A}× 100  <Equation>

wherein:
A is a water vapor transmission rate of the light-diffusive barrier film (F 1 );
B is another water vapor transmission rate of the light-diffusive barrier film (F 1 ) measured after applying a constant load on the surface of the barrier layer of the light-diffusive barrier film (F 1 ) so that the light-diffusing layer irregularity surface of another light-diffusive barrier film (F 2 ) meets each other, to stack the two film and holding the constant load for 24 hours; the light-diffusive barrier films (F 1 , F 2 ) have the same configuration; and
the water vapor transmission rates (A, B) is measured using AQUATRAN 2 (MOCON) under conditions of 38° C. and 100% relative humidity.

2. A light-diffusive barrier film comprising a light-diffusing layer, a base layer and a barrier layer sequentially,
wherein a first side (S 1 ) opposite to a second side of the light-diffusing layer facing the base layer has surface roughness (Rt) of 0.02 μm or more to less than 0.1 μm, and the first side (S 1 ) of the light-diffusing layer with the surface roughness has a sheet resistance of 10 10 Ω/sq or less,
wherein the light-diffusing layer is formed from a coating composition comprising 0.1 parts by weight or more of particles relative to 100 parts by weight of a curable resin,
wherein the surface roughness (Rt) means a distance between the highest point (H1) and the lowest point (H2), that is, a height difference (ΔH=H1−H2), when a layer, which is intended to measure the surface roughness, is observed in the direction normal to the surface,
wherein a water vapor transmission change rate calculated by the following equation satisfies 30% or less:
Water Vapor Transmission Change Rate (%)={( B−A )/ A}× 100  <Equation>

wherein:
A is a water vapor transmission rate of the light-diffusive barrier film (F 1 );
B is another water vapor transmission rate of the light-diffusive barrier film (F 1 ) measured after applying a constant load on the surface of the barrier layer of the light-diffusive barrier film (F 1 ) so that the light-diffusing layer irregularity surface of another light-diffusive barrier film (F 2 ) meets each other, to stack the two film and holding the constant load for 24 hours; the light-diffusive barrier films (F 1 , F 2 ) have the same configuration; and
the water vapor transmission rates (A, B) is measured using AQUATRAN 2 (MOCON) under conditions of 38° C. and 100% relative humidity.

3. The light-diffusive barrier film according to claim 2 , wherein the light-diffusing layer comprises an antistatic agent.

4. The light-diffusive barrier film according to claim 1 , wherein the barrier layer comprises one or more sub-barrier layers.

5. The light-diffusive barrier film according claim 4 , wherein the sub-barrier layer has a thickness in a range of 20 to 400 nm.

6. The light-diffusive barrier film according to claim 4 , wherein the barrier layer or the sub-barrier layer is a polysilazane layer or a cured layer of the polysilazane layer.

7. The light-diffusive barrier film according to claim 6 , wherein the polysilazane has a unit of the following Formula 1:

wherein, R 1 , R 2 and R 3 are each independently hydrogen, an alkyl group, an alkenyl group, an alkynyl group, an aryl group, an alkylsilyl group, an alkylamide group or an alkoxy group.

8. The light-diffusive barrier film of claim 1 , wherein the light-diffusing layer has a thickness of 20 μm or less.

9. The light-diffusive barrier film of claim 1 , wherein the light-diffusing layer, the base layer and the barrier layer are in direct contact with each other.

10. An electric or electronic device comprising the light-diffusive barrier film of claim 1 .

11. A method for producing a light-diffusive barrier film of claim 1 , comprising:
providing a laminate comprising a base layer and a light-diffusing layer, wherein a first side (S 1 ) opposite to a second side of the light-diffusing layer facing the base layer has surface roughness (Rt) in a range of 0.1 to 6 μm; and
applying a barrier layer coating composition on the first side opposite to the second side of the base layer, on which the light-diffusing layer is formed, and then drying it to form a polysilazane layer.

12. A method for producing a light-diffusive barrier film of claim 2 , comprising:
providing a laminate comprising a base layer and a light-diffusing layer, wherein a first side (S 1 ) opposite to a second side of the light-diffusing layer facing the base layer has surface roughness (Rt) of 0.02 μm or more and less than 0.1 μm and the first side (S 1 ) of the light-diffusing layer with the surface roughness has a sheet resistance of 10 10 Ω/sq or less; and
applying a barrier layer coating composition on the first side opposite to the second side of the base layer, on which the light-diffusing layer is formed, and then drying it to form a polysilazane layer.

13. The method of claim 11 , wherein a light-diffusing layer coating composition comprising 10 parts by weight or more of particles relative to 100 parts by weight of a curable resin is coated on one side of the base layer and then cured to form the light-diffusing layer.

14. The method of claim 11 , wherein the barrier layer coating composition comprises a polysilazane of Formula 1:

wherein, R1, R2 and R3 are each independently a hydrogen atom, an alkyl group, an alkenyl group, an alkynyl group, an aryl group, an alkylsilyl group, an alkylamide group or an alkoxy group.

15. The method for producing a light-diffusive barrier film according to claim 14 , wherein a roll-to-roll process is used, and
the method further comprises winding the laminate provided in the first step onto a roll (R 1 ) before applying the barrier layer coating composition.

16. The method of claim 15 , wherein the wound laminate is unwound from the roll (R 1 ) for applying the barrier layer coating composition and further comprises winding the light-diffusive barrier film after applying the barrier layer coating composition on a roll (R 2 ) and holding the wound state for 1 hour or longer.

17. The method of claim 16 , further comprising unwinding the wound light-diffusive barrier film from the roll (R 2 ) and curing the polysilazane of the barrier layer coating composition and the curing of the polysilazane is performed by plasma treatment or UV light irradiation.

Assignees

• Lg Chemical Ltd

Inventors

• Jeong Hee Joon
• Hwang Jang Yeon
• Park Bo Ra
• Shin Sung Jin
• Yang Hee Wang

Classifications

• C09D133/14

  of esters containing halogen, nitrogen, sulfur or oxygen atoms in addition to the carboxy oxygen · CPC title

• B32B2307/538

  Roughness · CPC title

• B32B2307/40

  having particular optical properties · CPC title

• G02B1/16

  having an anti-static effect, e.g. electrically conducting coatings · CPC title

• C09D183/16

  in which all the silicon atoms are connected by linkages other than oxygen atoms · CPC title