Title:
HEAT-SHRINKABLE POLYESTER FILM, AND PRODUCTION METHOD THEREFOR AND PACKAGE THEREOF
Document Type and Number:
WIPO Patent Application WO/2017/018345
Kind Code:
A1
Abstract:
[Problem] To provide a heat-shrinkable polyester film which has a high heat shrinkage rate in the width direction, exhibits a low heat shrinkage rate in the longitudinal direction, and has a great mechanical strength in the longitudinal direction, good openability along perforations, and excellent shrink finish. [Solution] This heat-shrinkable polyester film satisfies the following requirements (1)-(4): (1) the hot-water heat shrinkage rate is 50-85% in the main shrinking direction of the film when the film is immersed in 98°C hot water for 10 seconds; (2) the hot-water heat shrinkage rate is -5% to 12% in a direction perpendicular to the main shrinking direction of the film when the film is immersed in 98°C hot water for 10 seconds; (3) the maximum shrinkage stress is 2-7 MPa in the main shrinking direction of the film when measured in 90°C hot air, and the shrinkage stress 30 seconds after measurement of the shrinkage stress has started is 60-100% of the maximum shrinkage stress; and (4) the film contains 6 mol% or more of diethylene glycol-derived constituent units with respect to 100 mol% of all polyester resin components.
Inventors:
HARUTA MASAYUKI (JP)
ISHIMARU SHINTARO (JP)
ISHIMARU SHINTARO (JP)
Application Number:
PCT/JP2016/071558
Publication Date:
February 02, 2017
Filing Date:
July 22, 2016
Export Citation:
Assignee:
TOYO BOSEKI (JP)
International Classes:
B29C55/12; B29C61/06; B65D23/08; B65D25/20; B65D65/02; B65D75/00; B65D77/22; C08J5/18; B29K67/00; B29K105/02; B29L7/00
Foreign References:
| JP2011102392A | 2011-05-26 | |||
| JP5240387B1 | 2013-07-17 | |||
| JP2007016120A | 2007-01-25 | |||
| JP2007056156A | 2007-03-08 | |||
| JP2014055236A | 2014-03-27 | |||
| JPH03142224A | 1991-06-18 | |||
| JP2011184690A | 2011-09-22 |
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