Title:
POLYESTER FILM WITH FOLD RETENTION, LOW SHRINKAGE AND EXCELLENT CONCEALMENT PROPERTIES
Document Type and Number:
WIPO Patent Application WO/2016/002488
Kind Code:
A1
Abstract:
The purpose of the present invention is to provide a polyester film, which has a superior fold retention angle, for which thermal shrinkage in high temperature environments is very low, and which has excellent content concealment properties. The present invention is a polyester film characterized in being obtained from non-crystalline polyester containing ethylene terephthalate units and in satisfying conditions (1) through (3) below.
(1) With regard to stress at 40% elongation in respective tension tests in the longitudinal and width directions of the film, the mean values for the stress at 40% elongation for the longitudinal direction and the stress at 40% elongation for the width direction are 30 MPa - 90 MPa.
(2) The hot water thermal shrinkage ratios in the longitudinal and width directions when treated for 10 seconds in hot water of 80°C were both -10% - 10%.
(3) The total light transmittance is 20% - 50%.
Inventors:
ISHIMARU SHINTARO (JP)
HARUTA MASAYUKI (JP)
HARUTA MASAYUKI (JP)
Application Number:
PCT/JP2015/067175
Publication Date:
January 07, 2016
Filing Date:
June 15, 2015
Export Citation:
Assignee:
TOYO BOSEKI (JP)
International Classes:
C08J5/18; B29C55/02; B29C71/02; B32B5/24; B32B27/36; C08J9/00; B29L7/00
Foreign References:
| JP2004035594A | 2004-02-05 | |||
| JP2007106462A | 2007-04-26 |
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