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:
Nov. 29, 2022
Filed:
Feb. 28, 2018
Toyobo Co., Ltd., Osaka, JP;
Furanix Technologies B.v., Amsterdam, NL;
Shota Hayakawa, Otsu, JP;
Yukihiro Numata, Otsu, JP;
Katsuya Ito, Otsu, JP;
Jun Inagaki, Osaka, JP;
Toshiyuki Shimizu, Inuyama, JP;
Shoichi Gyobu, Osaka, JP;
Chikao Morishige, Osaka, JP;
Jesper Gabriel Van Berkel, Amsterdam, NL;
TOYOBO CO., LTD., Osaka, JP;
FURANIX TECHNOLOGIES B.V., Amsterdam, NL;
Abstract
It is provided that a method for producing a biaxially oriented polyester film that can be used for industrial and packaging applications. A method for producing a biaxially oriented polyester film, comprising: a step of feeding a polyester resin into an extruder, a step of extruding the molten polyester resin from an extruder to obtain a molten resin sheet at 250 to 310° C., a step of attaching the molten resin sheet closely to a cooling roll by an electrostatic application method to obtain an unstretched sheet, and a step of biaxially stretching the unstretched sheet, wherein the polyester resin fulfills the following (A) to (C): (A) the polyester resin comprises a polyethylene furandicarboxylate resin composed of a furandicarboxylic acid and ethylene glycol; (B) an intrinsic viscosity of the polyester resin is 0.50 dL/g or more; (C) a melt specific resistance value at 250° C. of the polyester resin is 3.0×10Ω·cm or less.