# US 11,078,388 B2 · Adhesive composition, sealing sheet, and sealed body

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- Number: US 11,078,388 B2
- Document ID: US11078388B2
- Status: Granted
- Kind: B2
- Application number: 16/331,117
- Filed: 2017-09-07
- Published: 2019-07-18
- Granted: 2021-08-03
- Earliest claimed: 2016-09-07
- Assignees: Lintec Corporation
- Applicants: Lintec Corporation
- Inventors: Kenta Nishijima; Tatsuki Hasegawa
- Web page: https://patentgrep.com/patent/US11078388B2

## CPC

- C09J 151/06: grafted on to homopolymers or copolymers of aliphatic hydrocarbons containing only one carbon-to-carbon double bond
- B32B 27/00: Layered products comprising {a layer of} synthetic resin {(fibrous or filamentary layer made of a synthetic resin B32B5/02; particulate layer made of a synthetic resin B32B5/16; foamed layer made of a synthetic resin B32B5/18)}
- B32B 27/32: comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)}
- B32B 27/38: comprising epoxy resins
- C09J 7/00: Adhesives in the form of films or foils
- C09J 7/30: characterised by the adhesive composition
- C09J 11/06: organic
- C09J 11/08: Macromolecular additives
- C09J 123/26: modified by chemical after-treatment
- C09J 163/00: Adhesives based on epoxy resins; Adhesives based on derivatives of epoxy resins
- G02F 1/1339: Gaskets; Spacers; Sealing of cells
- H05B 33/04: Sealing arrangements {, e.g. against humidity}
- H10F 19/80: Encapsulations or containers for integrated devices, or assemblies of multiple devices, having photovoltaic cells
- C09J 2203/318: for the production of liquid crystal displays
- C09J 2203/322: for the production of solar panels
- C09J 2423/00: Presence of polyolefin
- C09J 2463/00: Presence of epoxy resin
- H10K 50/844: Encapsulations
- Y02E 10/50: Photovoltaic [PV] energy
- 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)
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H10F: INORGANIC SEMICONDUCTOR DEVICES SENSITIVE TO INFRARED RADIATION, LIGHT, ELECTROMAGNETIC RADIATION OF SHORTER WAVELENGTH OR CORPUSCULAR RADIATION
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

Provided is an adhesive composition containing component (A) (a modified polyolefin-based resin) and component (B) (a polyfunctional epoxy compound), wherein as a result of measuring a storage elastic modulus of a solid content, a storage elastic modulus at 23° C. is 0.1 to 600 MPa, and a storage elastic modulus at 80° C. is 0.1 MPa or lower. Also provided are: a sealing sheet having an adhesive layer formed using the adhesive composition, and a sealed body comprising a seal object that is sealed with the sealing sheet. The adhesive composition is easy to form into a sheet and excellent in unevenness followability. The sealing sheet has an adhesive layer which is formed of this adhesive composition and is excellent in unevenness followability, and a sealed body has a seal object sealed with the sealing sheet.

## Claims

### Claim 1

An adhesive composition containing the following components (A) and (B),
wherein the content of the component (B) is 50 to 150 parts by mass based on 100 parts by mass of the component (A), and as a result of measuring a storage elastic modulus of a solid content, a storage elastic modulus at 23° C. is 0.1 to 600 MPa, and a storage elastic modulus at 80° C. is 0.1 MPa or lower:
Component (A): modified polyolefin-based resin
Component (B): polyfunctional epoxy compound.

### Claim 2 (depends on 1)

The adhesive composition according to claim 1, wherein the component (A) is an acid-modified polyolefin-based resin.

### Claim 3 (depends on 1)

The adhesive composition according to claim 1, which further contains the following component (C):
Component (C): tackifier having a softening point of 80° C. or higher.

### Claim 4 (depends on 3)

The adhesive composition according to claim 3, wherein the content of the component (C) is 1 to 200 parts by mass based on 100 parts by mass of the component (A).

### Claim 5 (depends on 1)

The adhesive composition according to claim 1, which further contains the following component (D):
Component (D): imidazole-based curing catalyst.

### Claim 6 (depends on 5)

The adhesive composition according to claim 5, wherein the content of the component (D) is 0.1 to 10 parts by mass based on 100 parts by mass of the component (A).

### Claim 7 (depends on 1)

The adhesive composition according to claim 1, which further contains the following component (E):
Component (E): silane coupling agent.

### Claim 8 (depends on 7)

The adhesive composition according to claim 7, wherein the content of the component (E) is 0.01 to 10 parts by mass based on 100 parts by mass of the component (A).

### Claim 9 (depends on 1)

A sealing sheet composed of two release films and an adhesive layer sandwiched between the release films, wherein the adhesive layer is formed of the adhesive composition according to claim 1.

### Claim 10 (depends on 9)

A sealed body, wherein a seal object is sealed with the sealing sheet according to claim 9.

### Claim 11 (depends on 1)

A sealing sheet composed of a release film, a gas barrier film, and an adhesive layer sandwiched between the release film and the gas barrier film, wherein the adhesive layer is formed of the adhesive composition according to claim 1.

### Claim 12 (depends on 11)

The sealing sheet according to claim 11, wherein the gas barrier film is a metal foil, a resin film or a thin film glass.

### Claim 13 (depends on 9)

The sealing sheet according to claim 9, wherein the adhesive layer has a thickness of 5 to 25 μm.

### Claim 14 (depends on 10)

The sealed body according to claim 10, wherein the seal object is an organic EL element, an organic EL display element, a liquid crystal display element or a solar cell element.