The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 21, 2014
Filed:
Mar. 30, 2010
Naoko Matsumura, Gifu, JP;
Atsushi Oyamatsu, Gifu, JP;
Naoko Matsumura, Gifu, JP;
Atsushi Oyamatsu, Gifu, JP;
Teijin Dupont Films Japan Limited, Tokyo, JP;
Abstract
In a laminated polyester film for solar cell backsheets, which includes a surface layer (A) and a substrate layer (B), the surface layer (A) is made of a polyester composition including 10 to 30 wt % of rutile-type titanium dioxide particles and 70 to 90 wt % of a polyester, the substrate layer (B) is made of a polyester composition including 0.1 to 4 wt % of rutile-type titanium dioxide particles and 96 to 99.9 wt % of a polyester, the substrate layer (B) has a thickness of 70% to 97% of the total film thickness, the weight average molecular weight and COOH end group concentration of polyester in the laminated film are 47,000 to 65,000 and 6 to 25 eq/ton, respectively, and the average content of rutile-type titanium dioxide particles in all layers of the laminated film is 3 to 8 wt %. As a result, a laminated polyester film for solar cell backsheets, which has excellent weatherability and hydrolysis resistance and is capable of maintaining strength over a long period of time, is provided.