POLYESTER FILM AND USE THEREOF

Title:

POLYESTER FILM AND USE THEREOF

Document Type and Number:

WIPO Patent Application WO/2020/162119

Kind Code:

A1

Abstract:

[Problem] To provide a polyester film that is for a foldable display and that causes no cracks on a folding part, in order to provide a foldable display which has excellent mass producibility and which is unlikely to cause distortion of an image displayed on a folding portion after the display is folded repeatedly. [Solution] This polyester film for a foldable display has a thickness of 10-80 µm and satisfies conditions (1) the refractive index in the bending direction is 1.590-1.620, (2) the refractive index in the direction of a folding part is 1.670-1.700, (3) the refractive index in the thickness direction is not more than 1.520, and (4) the density is not less than 1.380 g/cm3 (here, the bending direction is a direction orthogonal to the folding part when the polyester film is folded).

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Inventors:

NISHIO SHOTARO (JP)
KAWAI KIWAMU (JP)
SHIMIZU AKIRA (JP)
ITO KATSUYA (JP)

Application Number:

PCT/JP2020/001043

Publication Date:

August 13, 2020

Filing Date:

January 15, 2020

Export Citation:

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Assignee:

TOYO BOSEKI (JP)

International Classes:

C08J5/18; B32B7/023; B32B27/00; B32B27/36; C08J7/04; C09J7/25; G02B1/14; G02B5/30; G09F9/00; H01L27/32

Domestic Patent References:

WO2013100042A1	2013-07-04
WO2018150940A1	2018-08-23
WO2018159285A1	2018-09-07
WO2017115736A1	2017-07-06

Foreign References:

JP2014065887A	2014-04-17
JP2018072663A	2018-05-10
JP2001324603A	2001-11-22
JP2015232120A	2015-12-24

Other References: