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:
Sep. 24, 2019
Filed:
Aug. 01, 2016
Toyobo Co., Ltd., Osaka-shi, Osaka, JP;
Masafumi Inoue, Tsuruga, JP;
Masayuki Haruta, Tsuruga, JP;
TOYOBO CO., LTD., Osaka, JP;
Abstract
The invention provides a heat-shrinkable polyester film which has sufficient heat shrinkage properties in the main shrinkage direction that is the longitudinal direction without containing a monomer component that can form an amorphous component in a large amount, and which has a low heat shrinkage and a low shrinkage stress in the width direction orthogonal to the main shrinkage direction. The film has a heat shrinkage of 15-50% in a main shrinkage direction of the film and 0-12% in a direction orthogonal to the main shrinkage direction of the film, when treated for 10 seconds in hot water of 90° C., and a maximum shrinkage stress of 2-10 MPa in the main shrinkage direction of the film when measured under hot air of 90° C. The film contains 7-30 mol % of a constituent unit derived from diethylene glycol in 100 mol % of the whole polyester resin component.