Polymer foam adhesive tape and pressure-sensitive type touch panel comprising the same

Patent metadata

Field	Value
Publication number	US-10908748-B2
Application number	US-201716344549-A
Country	US
Kind code	B2
Filing date	Oct 27, 2017
Priority date	Oct 27, 2016
Publication date	Feb 2, 2021
Grant date	Feb 2, 2021

Abstract

A polymer foam adhesive tape including: a substrate film; a polymer foam layer provided on one surface of the substrate film; a first adhesive layer provided on the polymer foam layer; and a second adhesive layer provided on the other surface of the substrate film, in which the polymer foam layer has a density of 0.3 g/cm 3 or less, and a thickness ratio of the substrate film to the polymer foam layer is 1:3 to 1:10.

First claim

The invention claimed is:

1. A polymer foam adhesive tape comprising:
a substrate film;
a polymer foam layer provided directly on one surface of the substrate film;
a first adhesive layer provided on the polymer foam layer; and
a second adhesive layer provided on the other surface of the substrate film,
wherein the polymer foam layer has a density of 0.3 g/cm3 or less, and
a thickness ratio of the substrate film to the polymer foam layer is 1:3 to 1:10, and wherein the polymer foam adhesive tape has a maximum compression rate of 30% to 70% and a minimum compression load of 30 g to 300 g.

2. The polymer foam adhesive tape of claim 1 , wherein the polymer foam adhesive tape has a dielectric constant of 2.5 to 4.5 at a frequency of 105 Hz.

3. The polymer foam adhesive tape of claim 1 , wherein the substrate film has a thickness of 10 μm to 250 μm.

4. The polymer foam adhesive tape of claim 1 , wherein the polymer foam layer has a thickness of 75 μm to 1,000 μm.

5. The polymer foam adhesive tape of claim 1 , wherein the substrate film and the polymer foam layer have a total thickness of 100 μm to 1,000 μm.

6. The polymer foam adhesive tape of claim 1 , wherein the polymer foam adhesive tape has a compression recovery rate of 90% or more, and a compression recovery time to reach 90% of a thickness before compression is within 0.1 second.

7. The polymer foam adhesive tape of claim 1 , wherein the polymer foam adhesive tape has a final compression recovery rate of 99% or more, and a compression recovery time to reach 99% of a thickness before compression is within 1.0 second.

8. A pressure-sensitive type touch panel comprising the polymer foam adhesive tape according to claim 1 .

9. The polymer foam adhesive tape of claim 1 , wherein a total thickness of the substrate film and the polymer foam layer is from 100 μm to 150 μm, and a thickness ratio of the substrate film to the polymer foam layer is from 1:3 to 1:10.

10. The polymer foam adhesive tape of claim 9 , wherein the thickness ratio is from 1:4 to 1:6.

11. The polymer foam adhesive tape of claim 1 , wherein a total thickness of the substrate film and the polymer foam layer is from 150 μm to 1,000 μm, and a thickness ratio of the substrate film to the polymer foam layer is from 1:4 to 1:10.

12. The polymer foam adhesive tape of claim 11 , wherein the thickness ratio is from 1:7 to 1:10.

13. The polymer foam adhesive tape of claim 1 , wherein the density is from 0.15 g/cm3 to 0.3 g/cm3.

14. The polymer foam adhesive tape of claim 1 , wherein the polymer foam layer is urethane-based foam layer, a silicone-based foam layer, an acrylic foam layer or a polyolefin-based foam layer.

15. The polymer foam adhesive tape of claim 1 , wherein the substrate film is a polymer film prepared from a material selected from the group consisting of polypropylene, polyethylene, polyvinyl chloride, polyethylene terephthalate, polyethylene naphthalate, polycarbonate, polymethyl(meth)acrylate (PMMA), cellulose acetate, cellulose triacetate, and ethyl cellulose.

16. The polymer foam adhesive tape of claim 1 , wherein the first adhesive layer and the second adhesive layer is each independently prepared by curing an adhesive agent, wherein the adhesive agent includes at least one resin of an acrylic polymer, a silicone-based polymer, or a rubber-based polymer.

Assignees

• Lg Chemical Ltd

Inventors

• Han Woo Joo
• Pyo Min Kyeong
• Choi Hong Jun
• Kim Jang Soon
• Yoon Kyung Jun

Classifications

• C09J2400/243

  in the substrate · CPC title

• C09J7/26 Primary

  Porous or cellular plastics · CPC title

• G06F3/0416

  Control or interface arrangements specially adapted for digitisers · CPC title

• G06F3/0412

  Digitisers structurally integrated in a display · CPC title

• B32B2457/208

  Touch screens · CPC title