Double-sided adhesive tape

Patent metadata

Field	Value
Publication number	US-12398295-B2
Application number	US-202117908405-A
Country	US
Kind code	B2
Filing date	Apr 16, 2021
Priority date	Apr 22, 2020
Publication date	Aug 26, 2025
Grant date	Aug 26, 2025

Abstract

Provided is a double-sided pressure-sensitive adhesive tape excellent in impact-absorbing property in the entirety of a wide temperature range, in particular, in a low-temperature region. The double-sided pressure-sensitive adhesive tape of the present invention includes: a base material layer; and pressure-sensitive adhesive layers arranged on both surface sides of the base material layer, wherein an entirety of the double-sided pressure-sensitive adhesive tape has a storage modulus of elasticity E′ in a range of from 1.0×105 Pa to 1.0×108 Pa, which is measured at from −25° C. to 120° C. and a frequency of 1 Hz.

First claim

The invention claimed is:

1. A double-sided pressure-sensitive adhesive tape, comprising:
a base material layer that contains at least one polar functional group-containing polymer selected from a condensation-type polymer and a polyaddition-type polymer, wherein
the at least one polar functional group-containing polymer is a polyurethane and has a carbonyl group in its polymer main chain as a polar functional group, and wherein
the base material layer is a non-foamed layer; and
pressure-sensitive adhesive layers arranged on both surface sides of the base material layer,
wherein an entirety of the double-sided pressure-sensitive adhesive tape has a storage modulus of elasticity E′ in a range of from 5.0×10 5 Pa to 1.0×10 8 Pa, which is measured at from −25° C. to 120° C. and a frequency of 1 Hz.

2. The double-sided pressure-sensitive adhesive tape according to claim 1 , wherein the base material layer has a storage modulus of elasticity E′ in a range of from 1.0×10 5 Pa to 1.0×10 8 Pa, which is measured at from −25° C. to 120° C. and a frequency of 1 Hz.

3. The double-sided pressure-sensitive adhesive tape according to claim 1 , wherein the pressure-sensitive adhesive layers each have a maximum of a storage modulus of elasticity G′ of 1.0×10 10 Pa or less, which is measured at from −25° C. to 120° C. and a frequency of 1 Hz.

4. The double-sided pressure-sensitive adhesive tape according to claim 1 , wherein the pressure-sensitive adhesive layers each have a pressure-sensitive adhesive strength to a SUS plate of 5 N/20 mm or more at 23° C. and 50% RH, a tensile rate of 300 mm/min, and a peel angle of 180°.

5. The double-sided pressure-sensitive adhesive tape according to claim 1 , wherein the polar functional group-containing polymer has at least one kind selected from an ether bond and an ester bond.

6. The double-sided pressure-sensitive adhesive tape according to claim 1 , wherein the pressure-sensitive adhesive layers each contain at least one kind selected from an acrylic pressure-sensitive adhesive, a rubber-based pressure-sensitive adhesive, a silicone-based pressure-sensitive adhesive, and a urethane-based pressure-sensitive adhesive.

7. The double-sided pressure-sensitive adhesive tape according to claim 1 , wherein the double-sided pressure-sensitive adhesive tape is an impact-absorbing tape for a display.

Assignees

• Nitto Denko Corp

Inventors

• Iseki Toru
• Yamanari Yusuke
• Saito Makoto
• Kanada Mitsuhiro

Classifications

• C09J2400/226

  in the substrate · CPC title

• C09J2301/302

  the adhesive being pressure-sensitive, i.e. tacky at temperatures inferior to 30°C · CPC title

• C09J2301/124

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

• C09J2301/312

  parameters being the characterizing feature · CPC title

• C09J7/25 Primary

  based on macromolecular compounds obtained otherwise than by reactions involving only carbon-to-carbon unsaturated bonds · CPC title