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:
Mar. 03, 2026
Filed:
Jul. 21, 2021
Toyobo Co., Ltd., Osaka, JP;
Masayuki Haruta, Tsuruga, JP;
TOYOBO CO., LTD., Osaka, JP;
Abstract
The invention provides a heat-shrinkable polyester-based film which has a high heat shrinkage ratio in the main shrinkage direction, as well as a high film puncture strength, bag breakage resistance upon bottle dropping, and excellent stiffness because of the high density of the film. The heat-shrinkable polyester-based film contains 60-95 mol % ethylene terephthalate units in 100 mol % of all ester units, 5-40 mol % diethylene glycol in 100 mol % of the polyhydric alcohol component, and 0-5 mol % constituent units derived from a monomer component that can be an amorphous component in all polyester resin components, in which the hot water heat shrinkage ratio, the puncture strength of the film, the density of the film, and the refractive index in the longitudinal direction of the film are within predetermined ranges when the film is immersed in hot water at 90° C. for 10 seconds.