# US 11,898,070 B2 · Adhesive tape and electronic device

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- Number: US 11,898,070 B2
- Document ID: US11898070B2
- Status: Granted
- Kind: B2
- Application number: 17/848,657
- Filed: 2022-06-24
- Published: 2023-01-26
- Granted: 2024-02-13
- Earliest claimed: 2021-07-08
- Assignees: DIC Corporation
- Applicants: DIC Corporation
- Inventors: Yoshimi Furukawa; Yuuya Kitade; Yuusuke Takahashi; Takeshi Iwasaki
- Web page: https://patentgrep.com/patent/US11898070B2

## CPC

- C09J 7/26: Porous or cellular plastics
- C09J 7/385: {Acrylic polymers}
- C09J 2301/312: parameters being the characterizing feature
- C09J 2433/00: Presence of (meth)acrylic polymer
- C09J: ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES (preparation of glue or gelatine C09H)

## Abstract

Provided are an adhesive tape having high flex resistance that can withstand repeated bending by folding operations and the like while maintaining high impact resistance, and an electronic device including the adhesive tape. The adhesive tape has an adhesive layer on one side or both sides of a foam base directly or with another layer interposed, in which the foam base contains an elastomer resin as a main component. The foam base has a tensile stress of 150 N/cm2 or less at 100% strain based on a stress-strain curve and a foam density of 0.2 g/cm3 to 2.0 g/cm3.

## Claims

### Claim 1

An adhesive tape comprising an adhesive layer on one side or both sides of a foam base directly or with another layer interposed therebetween, wherein:
the foam base contains an elastomer resin as a main component, and
the foam base has a tensile stress of 68 N/cm2 or more and 150 N/cm2 or less at 100% strain based on a stress-strain curve and a foam density of 0.2 g/cm3 to 2.0 g/cm3.

### Claim 2 (depends on 1)

The adhesive tape according to claim 1, wherein the foam base has a compressive strength at 25% of 1 kPa to 300 kPa.

### Claim 3 (depends on 1)

The adhesive tape according to claim 1, wherein the foam base has an elongation at break of 550% to 800%.

### Claim 4 (depends on 1)

The adhesive tape according to claim 1, wherein the foam base has a thickness of 50 μm to 500 μm.

### Claim 5 (depends on 1)

The adhesive tape according to claim 1, wherein the adhesive layer is formed of an acrylic adhesive.

### Claim 6 (depends on 1)

An electronic device comprising the adhesive tape according to claim 1.

### Claim 7 (depends on 1)

The adhesive tape according to claim 1, wherein the elastomer resin that constitutes the foam base comprises a styrenic thermoplastic elastomer.

### Claim 8 (depends on 1)

The adhesive tape according to claim 1, wherein the elastomer resin that constitutes the foam base comprises a non-crosslinked elastomer.