Title:
POLYESTER FILM AND METHOD FOR PRODUCING SAME
Document Type and Number:
WIPO Patent Application WO/2020/050351
Kind Code:
A1
Abstract:
A polyester film containing a polyester (A) composed mainly of polybutylene terephthalate and a polyester (B) composed mainly of polyethylene terephthalate, wherein the polyester film is characterized in that the mass ratio (A/B) of polyesters (A) and (B) is 70/30-55/45, the dry heat shrinkage rate (A) by 30-minute heat treatment at 160°C is 20% or less in all four directions of the film surface (0°, 45°, 90°, 135°), the difference between the maximum and minimum dry heat shrinkage rates thereof is 5% or less, the dry heat shrinkage rate (B) by 15-minute heat treatment at 200°C in the above four directions is 35% or less, the difference between the maximum and minimum dry heat shrinkage rates thereof 5% or less, and the thickness unevenness in the above four directions is 10% or less.
Inventors:
OKUZU TAKAYOSHI (JP)
AKAMATSU KEN (JP)
HAMAMOTO AKIKO (JP)
ASHIHARA HIROSHI (JP)
ARAKI GORO (JP)
KAJITA AKITO (JP)
AKAMATSU KEN (JP)
HAMAMOTO AKIKO (JP)
ASHIHARA HIROSHI (JP)
ARAKI GORO (JP)
KAJITA AKITO (JP)
Application Number:
PCT/JP2019/034909
Publication Date:
March 12, 2020
Filing Date:
September 05, 2019
Export Citation:
Assignee:
UNITIKA LTD (JP)
International Classes:
C08J5/18; B29C55/14; B32B15/09; B65D8/00
Domestic Patent References:
WO2017126563A1 | 2017-07-27 | |||
WO2017057773A1 | 2017-04-06 | |||
WO2017057773A1 | 2017-04-06 |
Foreign References:
JP2015131888A | 2015-07-23 | |||
JPS61209128A | 1986-09-17 | |||
JP2009221315A | 2009-10-01 | |||
JPH09150492A | 1997-06-10 | |||
JP2004009599A | 2004-01-15 | |||
JP2017066405A | 2017-04-06 | |||
JP2017226841A | 2017-12-28 | |||
JP3247053B2 | 2002-01-15 | |||
JP3753592B2 | 2006-03-08 |
Other References:
See also references of EP 3848404A4
Attorney, Agent or Firm:
MORIMOTO INT'L PATENT OFFICE (JP)
Download PDF:
Previous Patent: METHOD FOR DETECTING HUMAN PAPILLOMAVIRUS
Next Patent: INFORMATION PROCESSING DEVICE
Next Patent: INFORMATION PROCESSING DEVICE