POLYESTER-BASED HEAT SHRINK FILM

WIPO Patent Application WO/2023/032429

A1

Provided is a polyester-based heat shrink film capable of effectively suppressing a blocking phenomenon when being recycled. The present invention provides a polyester-based heat shrink film originating from a first polyester resin and a second polyester resin that serve as a plurality of polyester resins differing from each other in terms of the crystallinity, wherein the following properties (A)-(E) are satisfied. (A) and (B) The first polyester resin contains terephthalic acid, the reacting weight thereof with respect to ethylene glycol is in a range of values that are equal to or greater than 50 mol% and less than 90 mol%, the second polyester resin contains terephthalic acid, and the reacting weight thereof with respect to ethylene glycol is equal to or greater than 90 mol%. (C) and (D) In the case in which prescribed isothermal crystallization measurement is performed, a heat generation peak appears within 12 min. from the start, including the time for performing a cooling step, and the amount of heat at the heat generation peak is 5-35 J/g. (E) The thermal shrinkage percentage in the principal shrinkage direction measured under prescribed conditions is 20-60%.

JP2003105202	WEATHER-RESISTANT RESIN COMPOSITION
JP3545435	BASE FILM FOR MAGNETIC RECORDING TAPE
JP6789821	Polyester film

IRIFUNE TATSUYA (JP)
KANEKO TAKUMA (JP)
KANZAKA YUICHIRO (JP)
YUGE SHUUTA (JP)

PCT/JP2022/024981

March 09, 2023

June 22, 2022

Click for automatic bibliography generation  

C I TAKIRON CORP (JP)

C08J5/18; B29C61/06

WO2022044959A1

2022-03-03

JPS6164430A	1986-04-02
JPS6295341A	1987-05-01
JPS61203161A	1986-09-09
JP2010248496A	2010-11-04
JPH01127317A	1989-05-19
JP2007056156A	2007-03-08

EMORI Kenji et al. (JP)

View/Download PDF      PDF Help

Previous Patent: TIRE

Next Patent: GATE DRIVER