# US 8,569,437 B2 · Encapsulating material for solar cell

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- Number: US 8,569,437 B2
- Document ID: US8569437B2
- Status: Granted
- Kind: B2
- Application number: 13/732,683
- Filed: 2013-01-02
- Published: 2013-05-23
- Granted: 2013-10-29
- Earliest claimed: 2004-12-28
- Assignees: Du Pont-Mitsui Polychemicals Co., Ltd.; Mitsui Chemicals Tohcello, Inc.
- Applicants: Du Pont-Mitsui Polychemicals Co., Ltd.; Mitsui Chemicals Tohcello, Inc.
- Inventors: Koichi Nishijima; Akira Yamashita
- Web page: https://patentgrep.com/patent/US8569437B2

## CPC

- H10F 19/804: {Materials of encapsulations}
- C08K 5/14: Peroxides
- C08K 5/34924: {containing cyanurate groups; Tautomers thereof}
- C08L 23/02: not modified by chemical after-treatment
- C08L 23/0815: {with aliphatic 1-olefins containing one carbon-to-carbon double bond}
- C08L 23/10: Homopolymers or copolymers of propene
- H10F 19/80: Encapsulations or containers for integrated devices, or assemblies of multiple devices, having photovoltaic cells
- C08L 23/14: Copolymers of propene (C08L23/16 takes precedence)
- C08L 2203/206: use in coating or encapsulating of electronic parts
- C08L 2205/02: containing two or more polymers of the same C08L -group
- C08L 2312/00: Crosslinking
- Y02E 10/50: Photovoltaic [PV] energy
- H10F: INORGANIC SEMICONDUCTOR DEVICES SENSITIVE TO INFRARED RADIATION, LIGHT, ELECTROMAGNETIC RADIATION OF SHORTER WAVELENGTH OR CORPUSCULAR RADIATION
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

A solar cell encapsulated with an encapsulating material which is a non-crystalline or low-crystalline α-olefin-based copolymer or its composition (I). The composition (C) can contain 50 to 100 parts by weight of non-crystalline α-olefin polymer (A) which meets the following requirements: (a) the α-olefin having 3 to 20 carbon atoms is not less than 20 mol %, (b) practically no melt peak as measured by a differential scanning calorimeter is observed, and (c) the Mw/Mn is not more than 5, and 50 to 0 parts by weight of crystalline α-olefin polymer (B) (the total of (A) and (B) being 100 parts by weight). The non-crystalline or low-crystalline α-olefin copolymer may also have a crystallinity of not higher than 40% as measured by use of X rays.

## Claims

### Claim 1

A solar cell module which is obtained by using a solar cell encapsulating material comprising a copolymer of ethylene and α-olefin containing 50 to 90 mol % of ethylene polymerization unit and 50 to 10 mol % of polymerization unit of α-olefin other than ethylene, and having a crystallinity of 1 to 40% as measured by use of X rays, a melt flow rate (MFR) of 0.1 to 50 g/10 minutes and Shore D hardness of not higher than 60.

### Claim 2 (depends on 1)

The solar cell module according to claim 1, wherein at least one selected from the group consisting of cross-linking agents, cross-linking accelerators, silane-coupling agents, antioxidants, ultraviolet absorbers and light stabilizers is compounded to the copolymer.

### Claim 3 (depends on 1)

The solar cell module according to claim 1, wherein the haze of the copolymer at the thickness of 0.5 mm is not higher than 10%.

### Claim 4 (depends on 1)

The solar cell module according to claim 1, wherein the solar cell encapsulating material layer is cross-linked.

### Claim 5 (depends on 1)

The solar cell module according to claim 1, wherein the solar cell encapsulating material is in the form of sheet.