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. 20, 2026
Filed:
Feb. 18, 2021
Toray Industries, Inc., Tokyo, JP;
Toray Industries, Inc., Tokyo, JP;
Abstract
There is provided a polypropylene film that has excellent reliability and withstand voltage characteristics in high temperature environments when used in high voltage capacitors, that has a structure with excellent stability against heat and is suitable for applications in capacitors or the like to be used at high temperatures and high voltages, and that has excellent processability and does not wrinkle during a conveyance process including a vapor deposition process. The polypropylene film has an absolute value of a difference between a crystallite size obtained by scanning an a crystal () plane by wide angle X-ray diffraction in a main alignment direction and a crystallite size obtained by scanning an a crystal plane in a direction orthogonal to the main alignment direction is 3.0 nm or less, and a shrinkage stress in a machine direction (SF 135 MD) is 2.0 MPa or less at 135° C. in a heating process at a temperature elevation rate of 10° C./min in thermomechanical analysis (TMA).