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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 11186701 B1

PDFFull Text
Date of Patent:
Nov. 30, 2021

Filed:

Aug. 28, 2020

Biaxially oriented polyester film

Applicant:

Toyobo Film Solutions Limited, Tokyo, JP;

Inventors:

Makoto Handa, Tokyo, JP;

Shinji Muro, Tokyo, JP;

Assignee:

TOYOBO CO., LTD., Osaka, JP;

Attorney:

Leydig, Voit & Mayer, Ltd.

Primary Examiner:

Vivian Chen

Int. Cl.
CPC ...
C08K 3/36 (2006.01); C08L 67/03 (2006.01); B32B 27/08 (2006.01); B32B 27/36 (2006.01); B32B 27/18 (2006.01); C08K 3/013 (2018.01); B32B 3/00 (2006.01); C08L 67/00 (2006.01); C08L 67/02 (2006.01); G11B 5/66 (2006.01); G11B 5/70 (2006.01);
U.S. Cl.
CPC ...
C08K 3/36 (2013.01); B32B 27/08 (2013.01); B32B 27/18 (2013.01); B32B 27/36 (2013.01); C08L 67/03 (2013.01); B32B 3/00 (2013.01); B32B 2250/244 (2013.01); B32B 2264/0235 (2013.01); B32B 2307/514 (2013.01); B32B 2307/518 (2013.01); B32B 2367/00 (2013.01); C08K 3/013 (2018.01); C08L 67/00 (2013.01); C08L 67/02 (2013.01); C08L 2203/16 (2013.01); C08L 2205/025 (2013.01); G11B 5/66 (2013.01); G11B 5/70 (2013.01); Y10T 428/24355 (2015.01); Y10T 428/31786 (2015.04);
Abstract

A biaxially oriented polyester film, which exhibits an excellent winding property in a manufacturing process, and realizes an excellent electromagnetic conversion property and less failure of signals of a magnetic recording tape to be produced thereof, is provided. This biaxially oriented polyester film satisfies the formula y≤−24.9X+3.8, where the protrusion height X is 0.075 μm, 0.100 μm, and 0.125 μm, and y denotes a base-10 logarithm value of the number of protrusions having protrusion heights of X or more in a visual field of a region of 282 μm×211 μm, and a protrusion height that corresponds to a 0.4% area of a bearing curve based on protrusion height distribution is 65-90 nm.

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