# US 9,040,165 B2 · Solar cell sealing film and solar cell

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- Number: US 9,040,165 B2
- Document ID: US9040165B2
- Status: Granted
- Kind: B2
- Application number: 13/512,114
- Filed: 2010-10-20
- Published: 2012-11-15
- Granted: 2015-05-26
- Earliest claimed: 2009-11-26
- Assignees: Bridgestone Corporation
- Applicants: Hisataka Kataoka; Makiko Tomiyama
- Inventors: Hisataka Kataoka; Makiko Tomiyama
- Web page: https://patentgrep.com/patent/US9040165B2

## CPC

- H10F 19/804: {Materials of encapsulations}
- C08F 255/02: on to polymers of olefins having two or three carbon atoms
- C08F 255/026: {on to ethylene-vinylester copolymers}
- Y02E 10/50: Photovoltaic [PV] energy
- Y10T 428/31935: Ester, halide or nitrile of addition polymer
- H10F: INORGANIC SEMICONDUCTOR DEVICES SENSITIVE TO INFRARED RADIATION, LIGHT, ELECTROMAGNETIC RADIATION OF SHORTER WAVELENGTH OR CORPUSCULAR RADIATION
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A solar cell sealing film contains an ethylene-unsaturated ester copolymer, a crosslinker, and crosslinking auxiliary agents, wherein the solar cell sealing film contains a polyfunctional (meth)acrylate having 5 or more (meth)acryloyl groups in the molecule and triallyl isocyanurate as the crosslinking auxiliary agents, and a mass ratio of the polyfunctional (meth)acrylate to the triallyl isocyanurate is 0.06 to 0.3 parts of polyfunctional (meth)acrylate per 1 part of triallyl isocyanurate.

## Claims

### Claim 1

A solar cell sealing film, comprising:
ethylene-vinyl acetate copolymer,
an organic peroxide, and
crosslinking auxiliary agents,
wherein the organic peroxide is 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane,
wherein the solar cell sealing film comprises a polyfunctional (meth)acrylate having 6 (meth)acryloyl groups in the molecule and triallyl isocyanurate as the crosslinking auxiliary agents,
a mass ratio of the polyfunctional (meth)acrylate to the triallyl isocyanurate is 0.06 to 0.3 parts of polyfunctional (meth)acrylate per 1 part of triallyl isocyanurate,
a content of the triallyl isocyanurate is 0.5 to 3.0 parts by weight based on 100 parts by weight of the ethylene-vinyl acetate copolymer, and
a content of the polyfunctional (meth)acrylate is 0.15 to 0.5 part by weight based on 100 parts by weight of the ethylene-vinyl acetate copolymer.

### Claim 2 (depends on 1)

The solar cell sealing film as defined in claim 1, wherein the polyfunctional (meth)acrylate is dipentaerythritol hexa(meth)acrylate.

### Claim 3 (depends on 1)

The solar cell sealing film as defined in claim 1, wherein a content of the organic peroxide is 1.0 to 2.0 parts by weight based on 100 parts by weight of the ethylene-vinyl acetate copolymer.

### Claim 4 (depends on 1)

The solar cell sealing film according to claim 1, wherein the content of the polyfunctional (meth)acrylate is 0.3 to 0.5 part by weight based on 100 parts by weight of the ethylene-vinyl acetate copolymer.

### Claim 5 (depends on 1)

A solar cell having a structure where photovoltaic elements are sealed through solar cell sealing film(s) between a transparent front side protection material and a backside protection material,
wherein at least one of the solar cell sealing films is the solar cell sealing film as defined in claim 1.

### Claim 6 (depends on 5)

The solar cell according to claim 5, wherein the solar cell sealing film is cured by heating.