The invention provides a polyester film suitable for a back sheet for solar cells, which requires a high reflectance not only in the visible light region but also in the near-infrared region, and also requires a low reflection directivity. The polyester film is a cavity-containing polyester film having an average reflectance of 70-95% in a wavelength range of 400-1200 nm and an average transmittance of 5-30% in a wavelength range of 700-1200 nm.

Claims

12 · 1 independent · depth 5

12 granted claims

›1.independentA polyester film for solar cells comprising a cavity-containing polyester film having:nan average reflectance of 70% or greater and 95% or less in a w…+11

›2.↳ 1The polyester film for solar cells according to claim 1, wherein a cyclic trimer content of the polyester film is 5000 ppm or less.d2+5

›8.↳ 1The polyester film for solar cells according to claim 1, wherein the polyester film contains aluminum and/or a compound thereof and a phenolic compoun…d2+2

›11.↳ 1A back sheet for solar cells comprising:nthe polyester film for solar cells according to claim 1; and a light reflecting layer placed on one side of t…d2+1

Classifications

12 codes

IPC · International Patent Classification

Section B — Performing operations; transporting

B32B15/09
B32B27/36
B32B3/26
B23B3/26
B32B15/20
B32B27/18

Section C — Chemistry; metallurgy

C08J5/18

Section H — Electricity

H01L31/0216

USPC · US Patent Classification

428/308.4428/458428/480428/912.2

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Pendency

4.1 y

1,505 days filing → grant

Office actions

non-final + final

Responses

no RCE

Examiner

Ramsey Zacharia

art unit 1787 · TC 1700

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Citations: 23 back · 0 forward

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1 priority documents

›Priority documents — 1

Type	Document	Date
related publication	US 20120183792 A1	19 Jul 2012

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