COPOLYESTER RAW MATERIAL FOR AMORPHOUS FILM, HEAT-SHRINKABLE POLYESTER-BASED FILM, HEAT-SHRINKABLE LABEL, AND PACKAGE

Title:

COPOLYESTER RAW MATERIAL FOR AMORPHOUS FILM, HEAT-SHRINKABLE POLYESTER-BASED FILM, HEAT-SHRINKABLE LABEL, AND PACKAGE

Document Type and Number:

WIPO Patent Application WO/2020/026972

Kind Code:

A1

Abstract:

[Problem] To provide: a heat-shrinkable polyester film which has a high thermal shrinkage rate in a primary shrinkage direction, has a low thermal shrinkage rate in a non-shrinkage direction and exhibits little change in shrinkage rate after aging; and a raw material for producing the heat-shrinkable polyester film. [Solution] A copolyester raw material for an amorphous film, which is characterized by satisfying requirements (1)-(4) and being used to produce a film. (1) The raw material contains ethylene terephthalate as a primary constituent component, and if the total amount of glycol components among all polyester resin components is taken to be 100 mol%, the content of neopentyl glycol is 15-30 mol%. (2) The content of constituent units derived from diethylene glycol is 7-15 mol% relative to a total of 100 mol% of glycol components among all polyester resin components. (3) The limiting viscosity of the raw material is not less than 0.60 dl/g and less than 0.70 dl/g. (4) The glass transition temperature is 60-70°C.

Inventors:

INOUE MASAFUMI (JP)
HARUTA MASAYUKI (JP)

Application Number:

PCT/JP2019/029393

Publication Date:

February 06, 2020

Filing Date:

July 26, 2019

Export Citation:

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Assignee:

TOYO BOSEKI (JP)

International Classes:

C08G63/183; B29C61/06; B65D65/04; C08J5/18

Domestic Patent References:

WO2018110493A1	2018-06-21
WO2017018345A1	2017-02-02

Foreign References:

JPH0753737A	1995-02-28
JPH04164930A	1992-06-10
JPH02289627A	1990-11-29
JPH06256711A	1994-09-13
JP2017177677A	2017-10-05
JPH0533895B2	1993-05-20
JP4411556B2	2010-02-10
JPS5249997B2	1977-12-21
JP2011079229A	2011-04-21

Other References: