Double-sided tape and display device including the same

Patent metadata

Field	Value
Publication number	US-11499077-B2
Application number	US-201816233169-A
Country	US
Kind code	B2
Filing date	Dec 27, 2018
Priority date	Dec 27, 2017
Publication date	Nov 15, 2022
Grant date	Nov 15, 2022

Abstract

A double-sided tape including: a first adhesive layer including about 100 parts by weight of an acrylic polymer, about 1 to about 2 parts by weight of a silane coupling agent, and about 0.1 to about 0.18 parts by weight of carbon black; a foamed polymer layer disposed on the first adhesive layer, including a urethane foam; an interlayer polymer layer disposed on the foamed polymer layer, including a polyolefin (PO), polyethylene terephthalate (PET), a polyester, or a combination thereof; and a second adhesive layer disposed on the interlayer polymer layer, including about 100 parts by weight of an acrylic polymer, about 1 to about 2 parts by weight of a silane coupling agent, and about 0.1 to about 0.18 parts by weight of carbon black, wherein an overall thickness of the double-sided tape is in a range of about 0.4 millimeters to about 1.3 millimeters.

First claim

What is claimed is:

1. A double-sided tape in combination with a curved display panel having a curvature in at least one direction and a curved mold frame having a shape corresponding to the display panel, the display panel having a curvature in a range of about 600 R to about 4,000 R, wherein the double-sided tape is configured to fix the display panel to the mold frame, the double-sided tape comprising:
a first adhesive layer comprising about 100 parts by weight of an acrylic polymer, about 1 to about 2 parts by weight of a silane coupling agent, and about 0.1 to about 0.18 parts by weight of carbon black, the first adhesive layer having a degree of crosslinking of about 40% to about 49% by weight and an optical density of about 5 or greater;
a foamed polymer layer directly disposed on and in contact with the first adhesive layer, the foamed polymer layer comprising a urethane foam, the foamed polymer layer having an optical density of about 5 or greater and a thickness of about 0.3 millimeters to about 1.15 millimeters;
an interlayer polymer layer directly disposed on and in contact with the foamed polymer layer, the interlayer polymer layer comprising a polyolefin, a polyethylene terephthalate, a polyester, or a combination thereof, the foamed polymer layer having an optical density of about 5 or greater and a thickness of about 0.045 millimeters to about 0.055 millimeters; and
a second adhesive layer directly disposed on and in contact with the interlayer polymer layer, the second adhesive layer comprising about 100 parts by weight of an acrylic polymer, about 1 to about 2 parts by weight of a silane coupling agent, and about 0.1 to about 0.18 parts by weight of carbon black, the second adhesive layer having a degree of crosslinking of about 40% to about 49% by weight and an optical density of about 5 or greater,
wherein an overall thickness of the double-sided tape is in a range of about 0.4 millimeters to about 1.3 millimeters.

2. The double-sided tape of claim 1 , wherein the silane coupling agent comprises a compound represented by Formula 1:
Y′—Si—(OR) 3   Formula 1

wherein, in Formula 1, Y′ represents an amino group, an epoxy alkyl group, a mercapto group, or an allyl group, and each OR independently represents an alkoxy group or an acetyloxy group.

3. The double-sided tape of claim 1 , wherein the first adhesive layer, the second adhesive layer, or a combination thereof further comprises an isocyanate curing agent.

4. The double-sided tape of claim 3 , wherein the isocyanate curing agent comprises toluene-2,4-diisocyanate or a derivative thereof.

5. The double-sided tape of claim 3 , wherein the first adhesive layer, the second adhesive layer, or the combination thereof comprise about 6 to about 7 parts by weight of the isocyanate curing agent, based on the 100 parts by weight of the acrylic polymer.

6. The double-sided tape of claim 1 , wherein the foamed polymer layer has a density of about 0.36 grams per cubic centimeter to about 0.6 grams per cubic centimeter.

7. The double-sided tape of claim 1 , wherein the double-sided tape has a vertical ultimate tensile strength of about 15.47 kilogram-force per square inch or greater, when measured 24 hours after the double-sided tape is attached to a mold frame and a display panel.

8. The double-sided tape of claim 1 , wherein the double-sided tape has a horizontal ultimate tensile strength of about 12.8 kilogram-force per square inch or greater, when measured 30 minutes after the double-sided tape is attached to a mold frame and a display panel.

9. A double-sided tape in combination with a curved display panel having a curvature in at least one direction and a curved mold frame having a shape corresponding to the display panel, the display panel having a curvature in a range of about 600 R to about 4,000 R, wherein the double-sided tape is configured to fix the display panel to the mold frame, the double-sided tape comprising:
a first adhesive layer comprising about 100 parts by weight of an acrylic polymer, about 1 to about 2 parts by weight of a silane coupling agent, and about 0.1 to about 0.18 parts by weight of carbon black;
a foamed polymer layer directly disposed on and in contact with the first adhesive layer, the foamed polymer layer comprising a urethane foam, the foamed polymer layer having a thickness of about 0.3 millimeters to about 1.15 millimeters;
an interlayer polymer layer directly disposed on and in contact with the foamed polymer layer, the interlayer polymer layer comprising a polyolefin, a polyethylene terephthalate, a polyester, or a combination thereof, the interlayer polymer layer with a thickness of about 0.045 millimeters to about 0.055 millimeters; and
a second adhesive layer directly disposed on and in contact with the interlayer polymer layer, the second adhesive layer comprising about 100 parts by weight of an acrylic polymer, about 1 to about 2 parts by weight of a silane coupling agent, and about 0.1 to about 0.18 parts by weight of carbon black,
wherein an overall thickness of the double-sided tape is in a range of about 0.4 millimeters to about 1.3 millimeters.

10. The double-sided tape of claim 9 , wherein the first adhesive has a degree of crosslinking of about 40% to about 49% by weight.

11. The double-sided tape of claim 9 , wherein the second adhesive layer has a degree of crosslinking of about 40% to about 49% by weight.

12. The double-sided tape of claim 9 , wherein the first adhesive layer, and the foamed polymer layer, have an optical density of about 5 or greater.

13. The double-sided tape of claim 12 , wherein the interlayer polymer layer, and the second adhesive layer, have an optical density of about 5 or greater.

14. The double-sided tape of claim 9 , wherein the foamed polymer layer has a density in a range of about 0.36 g/cm 3 to about 0.6 g/cm 3 .

Assignees

• Samsung Display Co Ltd
• Sekisui Chemical Co Ltd

Inventors

• Park Se Ki
• Yeom Dong Yeol
• Noda Mariko
• Doi Satoshi
• Matsuki Shigeki
• Iwai Yuki
• Kawamoto Tomoya

Classifications

• C09J2301/124

  the adhesive layer being present on both sides of the carrier, e.g. double-sided adhesive tape · CPC title

• C08K5/54

  Silicon-containing compounds {(C08K5/0091 takes precedence)} · CPC title

• C09J2301/312

  parameters being the characterizing feature · CPC title

• B32B27/32

  comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)} · CPC title

• C09J7/30

  characterised by the adhesive composition · CPC title