# US 2014/0150866 A1 · Encapsulant for solar cell and interlayer film for laminated glass

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 2014/0150866 A1
- Document ID: US20140150866A1
- Status: Published application
- Kind: A1
- Application number: 14/129,714
- Filed: 2012-06-27
- Published: 2014-06-05
- Earliest claimed: 2011-06-28
- Assignees: Kuraray Co., Ltd.
- Inventors: Shinichi Muguruma; Takashi Mukose
- Web page: https://patentgrep.com/patent/US20140150866A1

## CPC

- C08K 5/11: of acyclic polycarboxylic acids
- B32B 17/10036: {comprising two outer glass sheets}
- B32B 17/10761: {containing vinyl acetal}
- C08K 5/0016: {Plasticisers}
- H10F 19/804: {Materials of encapsulations}
- C08K 5/103: with polyalcohols
- Y02E 10/50: Photovoltaic [PV] energy
- Y10T 428/3163: Next to acetal of polymerized unsaturated alcohol [e.g., formal butyral, etc.]
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- H10F: INORGANIC SEMICONDUCTOR DEVICES SENSITIVE TO INFRARED RADIATION, LIGHT, ELECTROMAGNETIC RADIATION OF SHORTER WAVELENGTH OR CORPUSCULAR RADIATION
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

Provided is an encapsulant for a solar cell which is highly anticorrosive and can form a solar cell module with a long life. Also provided is an interlayer film for laminated glass, which is highly anticorrosive and can form a laminated glass with long-term durability. The encapsulant for a solar cell or the interlayer film for laminated glass includes a material having a polyvinyl acetal content of 40% by mass or more and a chlorine content of 25 ppm or less and having a plasticizer content of 10 parts by mass or less based on 100 parts by mass of polyvinyl acetal.

## Claims

### Claim 1

An encapsulant for a solar cell or an interlayer film for laminated glass, comprising a material having a polyvinyl acetal content of 40% by mass or more and having a plasticizer content of 10 parts by mass or less based on 100 parts by mass of polyvinyl acetal.

### Claim 2 (depends on 1)

The encapsulant for a solar cell or the interlayer film for laminated glass according to claim 1, wherein the polyvinyl acetal has an average degree of polymerization of 100 to 5,000.

### Claim 3 (depends on 1)

The encapsulant for a solar cell or the interlayer film for laminated glass according to claim 1, wherein the polyvinyl acetal has an average degree of polymerization of 600 to 1,500.

### Claim 4 (depends on 1)

The encapsulant for a solar cell or the interlayer film for laminated glass according to claim 1 which has an amount of acid component change of at most 1.00 KOHmg/g after hot water test, wherein:
the amount of acid component change is expressed by formula (1):
(Amount of acid component change after hot water test)=A−B (1);
A represents a value (in units of KOHmg/g) obtained by dividing, by the mass (in units of g) of the encapsulant for a solar cell or the interlayer film for laminated glass before immersion of the material or a film comprising the material in hot water at 85° C. for 2,000 hours, the mass (in units of mg) of potassium hydroxide required to neutralize acid components present in both of the water and the encapsulant for a solar cell or the interlayer film for laminated glass after the immersion of the material or the film in hot water at 85° C. for 2,000 hours; and
B represents a value (in units of KOHmg/g) obtained by dividing, by the mass (in units of g) of the encapsulant for a solar cell or the interlayer film for laminated glass before the immersion, the mass (in units of mg) of potassium hydroxide required to neutralize acid components present in the encapsulant for a solar cell or the interlayer film for laminated glass before the immersion.

### Claim 5

A method for producing the encapsulant for a solar cell or the interlayer film for laminated glass, the method comprising performing acetalization of a polyvinyl alcohol with an aldehyde to obtain the polyvinyl acetal, wherein a chlorine-free catalyst is present in the acetalization.

### Claim 6 (depends on 5)

The method according to claim 5, wherein the chlorine-free catalyst is nitric acid.

### Claim 7 (depends on 1)

A solar cell module comprising the encapsulant for a solar cell according to claim 1.

### Claim 8 (depends on 7)

The solar cell module according to claim 7, further comprising a metal layer, wherein at least part of the encapsulant for a solar cell is in contact with the metal layer.

### Claim 9 (depends on 1)

A laminated glass, comprising the interlayer film for laminated glass according to claim 1.

### Claim 10 (depends on 9)

The laminated glass according to claim 9, further comprising a functional material, wherein at least part of the interlayer film for laminated glass is in contact with the functional material.

### Claim 11 (depends on 1)

The encapsulant for a solar cell or the interlayer film for laminated glass according to claim 1, comprising the material having a chlorine content of 25 ppm or less.