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:
Apr. 17, 2018
Filed:
Mar. 23, 2016
Toyobo Co., Ltd., Osaka-shi, Osaka, JP;
Masayuki Haruta, Tsuruga, JP;
Norimi Tabota, Osaka, JP;
TOYOBO CO., LTD., Osaka, JP;
Abstract
The invention provides a heat-shrinkable polyester film in which the differences in physical properties in the width direction are reduced even if the film has a small thickness. The heat-shrinkable polyester film has a main shrinkage direction in a width direction of the film and has (1) a thickness of 6-27 μm; (2) a maximum value of the molecular orientation angle of 5 degrees or less; (3) a hot-water shrinkage at 90° C. in the width direction of the film 40-85%; (4) a difference between a maximum value and a minimum value of the hot-water shrinkage at 90° C. in the width direction of the film of 2% or less; and (5) a difference between a maximum value and a minimum value of the maximum shrinkage stress at 90° C. in the width direction of the film of less than 0.3 MPa.