# US 12,006,452 B2 · Adhesive sheet

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- Number: US 12,006,452 B2
- Document ID: US12006452B2
- Status: Granted
- Kind: B2
- Application number: 17/262,811
- Filed: 2019-07-25
- Published: 2021-09-02
- Granted: 2024-06-11
- Earliest claimed: 2018-07-31
- Assignees: 3M Innovative Properties Company
- Applicants: 3M Innovative Properties Company
- Inventors: Haruyuki Mikami
- Web page: https://patentgrep.com/patent/US12006452B2

## CPC

- C09J 7/10: without carriers
- C09J 7/38: Pressure-sensitive adhesives [PSA]
- C09J 2301/10: characterized by the structural features of the adhesive tape or sheet
- C09J 2301/206: the adhesive layer comprising non-adhesive protrusions
- C09J 2301/208: the adhesive layer being constituted by at least two or more adjacent or superposed adhesive layers, e.g. multilayer adhesive
- C09J 2301/40: characterized by the presence of essential components
- 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

A pressure sensitive adhesive surface that does not adhere to the adherend and can be positioned by sliding it under low pressure, while it can exert a sufficient adhesive force under a pressure above a certain level. The adhesive sheet includes an adhesive layer with a fine structure on a surface thereof. The fine structure includes a plurality of cone or frustum structures, with the cones or frustums having two or more parts joined to each other via an interface. A first part is present on a top of the cones or frustums and is formed from a non-adhesive or a weak adhesive material, and a second part is present below the first part and is formed from a strong adhesive material.

## Claims

### Claim 1

An adhesive sheet comprising an adhesive layer with a structure on a surface thereof, wherein
the structure comprises a plurality of cone or frustum structures,
the cones or frustums have two or more parts joined to each other via an interface,
a first part present on a top of the cones or frustums is formed from a non-adhesive or a weak adhesive material, wherein the weak adhesive material is an adhesive having a storage modulus of elasticity of 3×105 Pa or greater as measured at a frequency of 1 Hz, and
a second part present below the first part is formed from a strong adhesive material, wherein the strong adhesive material is an adhesive having a storage modulus of elasticity of less than 3×105 Pa as measured at a frequency of 1 Hz,
wherein the first part and the second part of the cones or frustums are adjacent to each other, and a difference between a refractive index of the first part and a refractive index of the second part is within 1%.

### Claim 2 (depends on 1)

The adhesive sheet according to claim 1, wherein an angle θ formed between a side surface and a bottom surface of the cones or frustums is 8° or greater.

### Claim 3 (depends on 1)

The adhesive sheet according to claim 1, wherein a height of the first part is in a range from 10% to 90% of the cones or frustums when a height of the cones or frustums is 100%.

### Claim 4 (depends on 1)

The adhesive sheet according to claim 1, wherein in the fie structure, the longest distance between centers of two adjacent cones or frustums is 300 μm or less.

### Claim 5 (depends on 1)

The adhesive sheet according to claim 1, wherein the adhesive sheet comprises 16 or more of the cones or frustums per 1 mm2 of the surface of the adhesive layer.

### Claim 6 (depends on 1)

The adhesive sheet according to claim 1, wherein the first parts of the cones or frustums contain polyurethane, poly(meth)acrylate, cellulose, silicone, an amine-based resin, a fluororesin, or polyvinyl chloride.

### Claim 7 (depends on 1)

The adhesive sheet according to claim 1, wherein the first part of the cones or frustums comprises a material having a storage modulus of elasticity (G′) of 3×105 Pa or greater as measured at a frequency of 1 Hz at normal temperature.

### Claim 8 (depends on 1)

The adhesive sheet according to claim 1, wherein the adhesive sheet has a dynamic friction coefficient of 1.10 or less, when tested according to JIS K 7125.

### Claim 9 (depends on 1)

The adhesive sheet according to claim 1, wherein the adhesive sheet has a 180° peel adhesion strength of 1.0 N/10 mm or greater after 48 hours of adhesion, when tested under conditions of a temperature of 23° C. and a tensile speed of 200 mm/minute.

### Claim 10 (depends on 1)

The adhesive sheet according to claim 1, wherein the first part and second part are joined so as to be in contact with each other via a distinct interface.

### Claim 11 (depends on 1)

The adhesive sheet according to claim 1, wherein the non-adhesive material has a strength of adhesiveness to the same adherend that is weaker than that of the weak adhesive material, and the weak adhesive material has a strength of adhesiveness to the same adherend that is weaker than that of the strong adhesive material.

### Claim 12 (depends on 1)

The adhesive sheet according to claim 1, wherein an angle θ formed between a side surface and a bottom surface of the cones or frustums is 8° or greater, a height of the first part is in a range from 10% to 90% of the cones or frustums when a height of the cones or frustums is 100%, in the structure, the longest distance between centers of two adjacent cones or frustums is 300 μm or less, and the adhesive sheet comprises 16 or more of the cones or frustums per 1 mm2 of the surface of the adhesive layer.