BIAXIALLY ORIENTED POLYESTER FILM

WIPO Patent Application WO/2022/071440

A1

[Problem] To provide: a biaxially oriented polyester film which has achieved a good balance among moldability during hot molding, film strength and elasticity, while suppressing deposition of an oligomer (whitening) due to heating in a coating step of an adhesive resin or the like during the molding process, and which is capable of producing a molded body, a label or the like without deteriorating the quality; and a molded member which uses this biaxially oriented polyester film. [Solution] A biaxially oriented polyester film wherein: the content of an ester constituent unit derived from an isophthalic acid component relative to 100% by mole of all ester constituent units in the constituent polyester resin is from 0.5% by mole to 5.0% by mole; the amount of haze change of the film when heated at 150°C for 30 minutes is 5.0% or less; the limiting viscosity of the constituent polyester resin is from 0.59 dl/g to 0.65 dl/g; the average storage elastic modulus at 150°C is from 5.0 × 108 (Pa) to 7.6 × 108 (Pa); and the acid value of the film is from 40 eq/ton to 60 eq/ton.

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KAWAI KIWAMU (JP)
SHIMIZU AKIRA (JP)
TAKII ISAO (JP)

PCT/JP2021/035984

April 07, 2022

September 29, 2021

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TOYO BOSEKI (JP)

B32B9/00; B32B27/36; C08J5/18; C08J7/043; G09F3/02; G09F3/10

JP2019127536A	2019-08-01
JP2017210002A	2017-11-30
JP2017149987A	2017-08-31
JP2004075713A	2004-03-11
JP2005068238A	2005-03-17
JP2005186364A	2005-07-14

See also references of EP 4223505A4

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