Title:
HEAT SHRINKABLE WHITE POLYESTER FILM
Document Type and Number:
WIPO Patent Application WO/2023/145653
Kind Code:
A1
Abstract:
[Problem] The present invention addresses the problem of providing: a heat shrinkable white polyester film which has good and high perforated line openability if fitted as a label, while achieving good label appearance when fitted; and a label. [Solution] The present invention provides a heat shrinkable white polyester film which comprises a polyester resin that contains ethylene terephthalate as a main constituent component, while containing not less than 13% by mole of one or more monomer components that are capable of serving as an amorphous component among all components of the polyester resin; and this heat shrinkable white polyester film satisfies the requirements (1) to (6) described below. (1) If a heat shrinkable white polyester film is processed in hot water at 98°C for 10 seconds, the hot water thermal shrinkage ratio in the longitudinal direction is 0% to 15%. (2) If a heat shrinkable white polyester film is processed in hot water at 98°C for 10 seconds, the hot water thermal shrinkage ratio in the width direction is 50% to 80%. (3) If the transconformation ratio of a heat shrinkable polyester film is the ratio (A1/A2) of the absorbance A1 at 1,340 cm-1 to the absorbance A2 at 1,410 cm-1 of the heat shrinkable polyester film as determined by a polarized ATR-FTIR method, the transconformation ratio is 0.3 to 0.65 in the longitudinal direction that is the non-shrinkage direction of the film. (4) The total light transmittance of a film is 10% to 40%. (5) If subjected to a tensile test at 1,000 mm/min in the longitudinal direction after being shrunk by 20% in the width direction by means of a hot air oven, the elongation at break is 70% to 300%. (6) The distortion index of the molecular orientation angle is 0° to 15°.
Inventors:
YAMAZAKI ATSURO (JP)
ISHIMARU SHINTARO (JP)
ISHIMARU SHINTARO (JP)
Application Number:
PCT/JP2023/001765
Publication Date:
August 03, 2023
Filing Date:
January 20, 2023
Export Citation:
Assignee:
TOYO BOSEKI (JP)
YAMAZAKI ATSURO (JP)
ISHIMARU SHINTARO (JP)
YAMAZAKI ATSURO (JP)
ISHIMARU SHINTARO (JP)
International Classes:
B32B27/00; B29C61/02; B29C61/06; B32B27/36; B65D75/62; C08J5/18; C08J9/00
Domestic Patent References:
| WO2014199787A1 | 2014-12-18 |
Foreign References:
| JP2017177677A | 2017-10-05 | |||
| JP2009226934A | 2009-10-08 | |||
| JP2019147954A | 2019-09-05 |
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