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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.:

US 12365125 B1

PDFFull Text
Date of Patent:
Jul. 22, 2025

Filed:

Mar. 08, 2021

Flame-retardant biaxially-oriented polyester film

Applicant:

Toyobo Co., Ltd., Osaka, JP;

Inventor:

Hisao Okumura, Tokyo, JP;

Assignee:

TOYOBO CO., LTD., Osaka, JP;

Attorney:

Leydig, Voit & Mayer, Ltd.

Primary Examiner:

Sheeba Ahmed

Int. Cl.
CPC ...
B29C 48/08 (2019.01); B29C 48/00 (2019.01); B29C 55/12 (2006.01); C08G 63/183 (2006.01); C08K 5/5313 (2006.01); B29K 67/00 (2006.01); B29K 105/00 (2006.01); B29K 105/04 (2006.01); B29L 7/00 (2006.01); B29L 31/34 (2006.01);
U.S. Cl.
CPC ...
B29C 48/08 (2019.02); B29C 48/022 (2019.02); B29C 55/12 (2013.01); C08G 63/183 (2013.01); C08K 5/5313 (2013.01); B29K 2067/003 (2013.01); B29K 2105/0026 (2013.01); B29K 2105/04 (2013.01); B29K 2995/0016 (2013.01); B29K 2995/003 (2013.01); B29K 2995/0053 (2013.01); B29K 2995/0097 (2013.01); B29L 2007/00 (2013.01); B29L 2031/3475 (2013.01);
Abstract

The invention provides a flame-retardant biaxially-oriented polyester film which is porous and has high reflectance. The flame-retardant biaxially-oriented polyester film contains a polymer component containing polyethylene terephthalate and a flame retardant. The polyester film has an intrinsic viscosity of 0.50 to 0.64 dL/g and a density of 1.21 to 1.27 g/cm. A content of the polyethylene terephthalate in the polyester film is 70 to 97% by mass. The flame retardant contains at least one phosphorus-based flame retardant selected from the group consisting of a phosphinate and a diphosphinate. A content of the phosphorus-based flame retardant in the polyester film is 3 to 8% by mass. The polyester film is a porous film having an average reflectance of 60 to 74% at a wavelength of 400 to 700 nm. The polyester film has a thickness of 15 to 45 μm.

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Okumura, Hisao. (2025). Flame-retardant biaxially-oriented polyester film (U.S. Patent No. 12365125). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/12365125

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