High-refractive adhesive film and touch panel including the same

Patent metadata

Field	Value
Publication number	US-11091671-B2
Application number	US-201414917269-A
Country	US
Kind code	B2
Filing date	Oct 20, 2014
Priority date	Oct 23, 2013
Publication date	Aug 17, 2021
Grant date	Aug 17, 2021

Abstract

A high-refractive adhesive film includes: a thermosetting resin matrix; and high refractive particles dispersed in the thermosetting resin matrix. The refraction index of the high-refractive particles is higher than that of the thermosetting resin matrix.

First claim

The invention claimed is:

1. A touch panel, comprising:
a conductive plastic film including a plastic base layer and a conductive layer having a first and a second surface, such that the second surface of the conductive layer is directly on a surface of the plastic base layer, wherein the conductive layer is indium tin oxide; and
a high-refractive adhesive film, the high-refractive adhesive film is attached on the first surface of the conductive layer, wherein the high-refractive film comprises:
a thermosetting resin matrix; and
high refractive particles dispersed in the thermosetting resin matrix,
wherein a refraction index of the high refractive particles is higher than that of the thermosetting resin matrix,
wherein the refraction index of the high refractive particles is in the range of 1.75 to 2.18,
wherein a refractive index of the high-refractive adhesive film is in the range of 1.49 to 1.53, and
wherein a thickness of the high-refractive adhesive film is in the range of 55 μm to 250 μm.

2. The touch panel of claim 1 , wherein the high refractive particles are present in the amount of 0.1 to 10 parts by weight based on 100 parts by weight of the thermosetting resin matrix.

3. The touch panel of claim 1 , wherein an average diameter of the high refractive particles is in the range of 0.01 μm to 10 μm.

4. The touch panel of claim 1 , wherein the high refractive particles include one selected from the group consisting of: zirconium oxide (ZrO 2 ), titanium oxide (TiO 2 ), 3-vinylaniline, barium titanate, fluorene epoxy modified acrylate, niobium oxide, cerium oxide, zinc sulfide and a combination thereof.

5. The touch panel of claim 1 , wherein the thermosetting resin matrix is formed by curing an epoxy acrylate photo-curable resin composition or an acrylic photo-curable resin composition that includes one selected from the group consisting of: 2-ethylhexyl acylate (2-EHA), isobornyl acrylate (IBOA), hydroxy ethyl acrylate (HEA), hydroxy butyl acrylate (HBA), hydroxy propyl acrylate (HPA), hexyl methacrylate (HMA) and a combination thereof.

6. The touch panel of claim 1 , wherein a functional group exists on a surface of the high-refractive adhesive film,
wherein the functional group is selected from the group consisting of: a hydroxy group, a carbonyl group, an aldehyde group, a halo formyl group, a carbonate ester group, a carboxylate group, a carboxyl group, an ester group, a hydroperoxide group, peroxide group, an ether group, a hemiketal group, an acetal group, an ortho ester group, an ortho carbonate ester group, a carboxylic acid group, an amide group, an amine group, an imine group, an azide group, an azo compound group, a cyanate group, a nitrate group, a nitrile group, a nitro compound group, a nitroso compound group, a thiol group, a sulfonic acid group and a combination thereof.

7. The touch panel of claim 1 , wherein a release film is stacked on one surface of the high-refractive adhesive film.

8. The touch panel of claim 7 , wherein the release film includes a layer formed from a material selected from the group consisting of polyethylene terephthalate, silicone, and a combination thereof.

9. The touch panel of claim 1 , wherein the plastic base layer is a polyethylene terephthalate (PET) film.

10. A touch panel, comprising:
a conductive plastic film including a plastic base layer and a conductive layer having a first and a second surface, such that the second surface of the conductive layer is directly on a surface of the plastic base layer, wherein the conductive layer is indium tin oxide; and
a high-refractive adhesive film, the high-refractive adhesive film is attached on the first surface of the conductive layer, wherein the high-refractive film comprises:
a thermosetting resin matrix; and
high refractive particles dispersed in the thermosetting resin matrix,
wherein a refraction index of the high refractive particles is higher than that of the thermosetting resin matrix,
wherein the refraction index of the high refractive particles is in the range of 1.75 to 2.18,
wherein a refractive index of the high-refractive adhesive film is in the range of 1.49 to 1.56, and
wherein a thickness of the high-refractive adhesive film is in the range of greater than 100 μm to 250 μm.

Assignees

• Lg Chemical Ltd

Inventors

• Yoon Chan-Oh
• Park Sung-Chan
• Kim Jang-Soon
• Park Eun-Kyung
• Jung Bu-Gi
• Kim Won-Ho

Classifications

• C09J133/08

  Homopolymers or copolymers of acrylic acid esters · CPC title

• C09J2301/408

  additives as essential feature of the adhesive layer · CPC title

• C08K2003/2244

  of zirconium · CPC title

• C09J2203/318

  for the production of liquid crystal displays · CPC title

• C09J7/10 Primary

  without carriers · CPC title