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US 8,916,264 B2Granted
Polyester film for solar cells
AssigneeToyo Boseki Kabushiki Kaisha
InventorsNaoki Mizuno, Mutsuo Nishi, Jun Inagaki
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Abstract
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.
Claims12
A polyester film for solar cells comprising a cavity-containing polyester film having:
- an average reflectance of 70% or greater and 95% or less in a wavelength range of from 400 to 1200 nm;
- and
- an average transmittance of 5% or greater and 30% or less in a wavelength range of from 700 to 1200 nm;
- wherein the cavity-containing polyester film comprises (a) a polyester resin, (b) an incompatible thermoplastic resin, which is incompatible with the polyester resin, and (c) a dispersion thermoplastic resin, which is incompatible with both the polyester resin and the incompatible thermoplastic resin;
- the incompatible thermoplastic resin is present in 4 to 8 parts relative to 100 parts by mass of the polyester resin;
- and
- the dispersion thermoplastic resin is present in 10 to 50 parts relative to 100 parts by mass of the incompatible thermoplastic resin.
4 more elements
Dependencies are inferred from the claim text.