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:
Jun. 02, 2020
Filed:
Jan. 28, 2016
Mitsui Chemicals, Inc., Minato-ku, Tokyo, JP;
Keisuke Sato, Nagoya, JP;
Katsuki Onishi, Nagoya, JP;
Hiroaki Tsushima, Nagoya, JP;
Kazuhiro Tanimoto, Nagoya, JP;
Toshihisa Kitagawa, Nagoya, JP;
MITSUI CHEMICALS, INC., Minato-Ku, Tokyo, JP;
Abstract
A polymeric piezoelectric film, including a helical chiral polymer (A) having a weight average molecular weight of from 50,000 to 1,000,000 and optical activity, in which, in the film: a crystallinity given by a DSC method is from 20% to 80%; a standardized molecular orientation MORc is from 3.5 to 15.0 when a reference thickness measured by a microwave transmission-type molecular orientation meter is 50 μm; and when a direction parallel to a phase difference streak is a direction X, a direction perpendicular to the direction X and parallel to a main plane of a film is a direction Y, and the phase difference streak is evaluated by an evaluation method A, per a length of 1,000 mm in the direction Y, a number of phase difference streaks with an evaluation value of 60 or more is 0, and a sum of the evaluation values of phase difference streaks with an evaluation value of 20 or more is 1000 or less.