BIAXIALLY ORIENTED POLYESTER FILM AND PRODUCTION METHOD THEREFOR

WIPO Patent Application WO/2022/168702

A1

[Problem] To provide: a biaxially oriented polyester film that has excellent transparency, enables secondary processing such as coating and vapor deposition to be performed easily, exhibits excellent characteristics after undergoing secondary processing, and takes the environment into consideration through the use of a carbon-neutral polyester resin using a biomass-derived ethylene glycol, and that exhibits less variation in physical properties in the longitudinal direction even when being formed into a long film roll having a long roll length; and a method for producing said biaxially oriented polyester film. [Solution] This biaxially oriented polyester film comprises a polyester resin composition including particles and 50 wt% or more of a polyester resin formed from a biomass-derived ethylene glycol and a fossil fuel-derived dicarboxylate unit, and has at least one surface that satisfies all requirements of (1)-(3). (1) The number of fine projections having a height less than 3 nm is 250-600 per an area of 4×10-12m2. (2) The number of fine projections having a height not less than 3 nm is 300-600 per an area of 4×10-12m2. (3) The arithmetic mean height Sa is 0.010-0.025 μm.

MANABE NOBUYUKI (JP)
HARUTA MASAYUKI (JP)

PCT/JP2022/002851

August 11, 2022

January 26, 2022

Click for automatic bibliography generation  

TOYO BOSEKI (JP)

B29C55/12; B29C48/00; B29C48/285; B32B27/36; C08J5/18

WO2020195742A1	2020-10-01
WO2020031197A1	2020-02-13
WO2020095725A1	2020-05-14
WO2021019965A1	2021-02-04

CN106142794A	2016-11-23
JP2017100446A	2017-06-08
JPH10119172A	1998-05-12
JPH1110725A	1999-01-19
JP4834923B2	2011-12-14
JP2012097163A	2012-05-24

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