BIAXIALLY-STRETCHED POLYESTER FILM, LAMINATE AND PACKAGING BAG

Title:

BIAXIALLY-STRETCHED POLYESTER FILM, LAMINATE AND PACKAGING BAG

Document Type and Number:

WIPO Patent Application WO/2017/126563

Kind Code:

A1

Abstract:

[Problem] To provide a biaxially-stretched polyester film that can be used as a raw material for vapor deposition, that has excellent barrier properties, dimensional stability, processability, bag breakage resistance, and chemical resistance, and that is superior in terms of allowing a minimal transfer of extract to content after retort processing. [Solution] A biaxially-stretched polybutylene terephthalate film having the characteristics of (a), (b), (c) and (d) below, and having a thickness of 10-30 μm. (a) Comprises a polyester resin composition containing at least 60 mass% of polybutylene terephthalate resin (A). (b) Has a thermal shrinkage rate of -2 to +2% at 150°C and 30 minutes. (c) Has a thickness accuracy of 1 to 20%. (d) has a total content of 1,4-Butanediol and tetrahydrofuran, which volatilize while being heated for 60 minutes at 135°C, of 2000 ppb or less.

Inventors:

GOTO TAKAMICHI (JP)
YAMAZAKI ATSUSHI (JP)

Application Number:

PCT/JP2017/001586

Publication Date:

July 27, 2017

Filing Date:

January 18, 2017

Export Citation:

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Assignee:

TOYO BOSEKI (JP)

International Classes:

B29C55/12; B32B9/00; B32B27/36; C08J5/18

Domestic Patent References:

WO2004048071A1	2004-06-10
WO2014077197A1	2014-05-22

Foreign References:

JP2005097560A	2005-04-14
JP2008291238A	2008-12-04

Other References: