Title:
HEAT SHRINKABLE POLYESTER FILM AND PACKAGE
Document Type and Number:
WIPO Patent Application WO/2017/022703
Kind Code:
A1
Abstract:
[Problem] To provide a heat shrinkable polyester film that has sufficient thermal shrinkage characteristics in the main shrinkage direction, which is the longitudinal direction, without containing a large amount of a monomer component that may serve as an amorphous component, while having low thermal shrinkage in the width direction, which is perpendicular to the main shrinkage direction, and low shrinkage stress.
[Solution] A heat shrinkable polyester film which contains ethylene terephthalate as a main constituent, while containing from 0 mol% to 5 mol% (inclusive) of a monomer component that may serve as an amorphous component in all polyester resin components, and which is characterized by satisfying the following conditions (1)-(4).
(1) The hot water thermal shrinkage in the main shrinkage direction of film is from 15% to 50% (inclusive) in cases where the film is treated in a hot water at 90°C for 10 seconds.
(2) The hot water thermal shrinkage in the width direction, which is perpendicular to the main shrinkage direction of film, is from 0% to 12% (inclusive) in cases where the film is treated in a hot water at 90°C for 10 seconds.
(3) The maximum shrinkage stress in the main shrinkage direction of film as measured in a hot air at 90°C is from 2 MPa to 10 MPa (inclusive).
(4) A constituent unit derived from diethylene glycol is contained in an amount of from 7 mol% to 30 mol% (inclusive) in 100 mol% of all polyester resin components.
Inventors:
INOUE MASAFUMI (JP)
HARUTA MASAYUKI (JP)
HARUTA MASAYUKI (JP)
Application Number:
PCT/JP2016/072480
Publication Date:
February 09, 2017
Filing Date:
August 01, 2016
Export Citation:
Assignee:
TOYO BOSEKI (JP)
International Classes:
C08J5/18; B29C61/06; B65D65/02; B65D75/02; B29K67/00; B29K105/02; B29L7/00
Domestic Patent References:
| WO2014034704A1 | 2014-03-06 |
Foreign References:
| JP2011513550A | 2011-04-28 | |||
| JP2011184690A | 2011-09-22 | |||
| JP2014055236A | 2014-03-27 | |||
| JPH03142224A | 1991-06-18 |
Other References:
See also references of EP 3333215A4
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