Adhesive film and optical device including the same

Patent metadata

Field	Value
Publication number	US-11267921-B2
Application number	US-201816135228-A
Country	US
Kind code	B2
Filing date	Sep 19, 2018
Priority date	Nov 16, 2017
Publication date	Mar 8, 2022
Grant date	Mar 8, 2022

Abstract

An adhesive film includes an upper protective layer, a lower protective layer, and an adhesive layer between the upper protective layer and the lower protective layer. The adhesive layer includes an acrylic resin, a photoinitiator, and a fluorinated monomer. The fluorinated monomer includes an amount of 0.1 parts by weight or more based on 100 parts by weight of the acrylic resin.

First claim

What is claimed is:

1. An adhesive film, comprising:
an upper protective layer;
a lower protective layer; and
an adhesive layer between the upper protective layer and the lower protective layer,
wherein the adhesive layer includes an acrylic resin, a photoinitiator, and a fluorinated monomer,
wherein the fluorinated monomer includes an amount of 0.1 to 1.0 parts by weight based on 100 parts by weight of the acrylic resin,
wherein the fluorinated monomer is formed of one or more of: monomers having a straight-chain fluoroalkyl group, a branched fluoroalkyl group, and an alicyclic fluoroalkyl group,
wherein a thickness of a silicone adhesive applied to one surface of the upper protective layer, which is a surface attached to the adhesive layer, is larger than that of a silicone adhesive applied to one surface of the lower protective layer, which is a surface bonded or attached to the adhesive layer, such that the adhesive strength between the upper protective layer and the adhesive layer is larger than the adhesive strength between the lower protective layer and the adhesive layer, and
wherein the adhesive strength between the upper protective layer and the adhesive layer is reduced by UV irradiation.

2. The adhesive film of claim 1 , wherein the photoinitiator includes an amount of 3 to 5 parts by weight based on 100 parts by weight of the acrylic resin.

3. The adhesive film of claim 1 , wherein the UV irradiation is performed at 1 kW for 10 seconds or less.

4. An optical device, comprising:
a lower device;
an upper device; and
an adhesive layer between the upper device and the upper device,
wherein the adhesive layer includes an acrylic resin, a photoinitiator, and a fluorinated monomer,
wherein the fluorinated monomer includes an amount of 0.1 to 1.0 parts by weight based on 100 parts by weight of the acrylic resin,
wherein the fluorinated monomer is formed of one or more of: monomers having a straight-chain fluoroalkyl group, a branched fluoroalkyl group, and an alicyclic fluoroalkyl group, and
wherein a density of the fluorinated monomer differs in a thickness direction of the adhesive layer.

5. The optical device of claim 4 , wherein the photoinitiator includes an amount of 3 to 5 parts by weight based on 100 parts by weight of the acrylic resin.

6. The optical device of claim 4 , wherein the lower device includes at least one of a substrate, a light-emitting element, and a protective layer.

7. The optical device of claim 4 , wherein the upper device includes at least one of a polarizer, a cover window, and a touch panel.

Assignees

• Lg Display Co Ltd

Inventors

• Choi Wonjin
• Kim Junghan
• Chae Geesung

Classifications

• C08K5/095

  Carboxylic acids containing halogens · CPC title

• C09J2301/312

  parameters being the characterizing feature · CPC title

• C08K5/11

  of acyclic polycarboxylic acids · CPC title

• C08K5/101

  of monocarboxylic acids · CPC title

• C08K5/132

  Phenols containing keto groups {, e.g. benzophenones} · CPC title