公开(公告)号：US20220164003A1

公开(公告)日：2022-05-26

申请号：US17429147

申请日：2020-01-15

Applicant: TOYOBO CO., LTD.

Inventor： Shotaro NISHIO ,  Kiwamu KAWAI ,  Akira SHIMIZU ,  Katsuya ITO

IPC: G06F1/16 ,  G02B1/04 ,  G02B1/14 ,  G02B5/30

Abstract: Provided is a foldable display that is excellent in mass production applicability and unlikely to have image distortion at the folding portion of the display after repeated folding, as well as a mobile device equipped therewith. The foldable display contains a surface protection film and a polarizer. The surface protection film is composed of a polyester film, and the angle made by the slow axis of the polyester film with the absorption axis of the polarizer is 10 to 80°. The polyester film has a refractive index in the bending direction of 1.590 to 1.620, a refractive index in the direction of a folding portion of 1.670 to 1.700, a refractive index in the thickness direction of 1.520 or less, and a density of 1.380 g/cm3 or more, wherein the bending direction refers to a direction orthogonal to the folding portion of the polyester film to be folded.

公开(公告)号：US20250129220A1

公开(公告)日：2025-04-24

申请号：US18694320

申请日：2022-09-30

Applicant: TOYOBO CO., LTD.

Inventor： Kiwamu KAWAI ,  Akira SHIMIZU ,  Kenji YOSHINO

IPC: C08J5/18 ,  C08J7/04 ,  C08J7/043 ,  C08K3/08

Abstract: Provided is a biaxially oriented polyester film in which poor flatness that may be caused during heat processing is suppressed. In the biaxially oriented polyester film, the content rate of an ester constituting unit derived from an isophthalic acid component is 0.5-5.0 mol % with respect to 100 mol % of all ester constituting units, the amount of change in haze of the film is 5.0% or less, the intrinsic viscosity of constitutional polyester resins is 0.59-0.65 dl/g, the average value of storage moduli is 5.0-7.6×108 [Pa], the acid value of the film is 40-60 eq/ton, and the relational expression is satisfied: X×(Ymax3−Ymin3)≤0.0591×(X×Ymin3)+0.005, where X is the storage modulus at 170° C., and Y is the film thickness per 1000 mm in the transverse direction with Ymax as the maximum value and Ymin as the minimum value.

公开(公告)号：US20220252763A1

公开(公告)日：2022-08-11

申请号：US17614201

申请日：2020-05-14

Applicant: TOYOBO CO., LTD.

Inventor： Shotaro NISHIO ,  Kiwamu KAWAI ,  Akira SHIMIZU

IPC: G02B1/14 ,  G02B1/04 ,  H01L51/52 ,  H04M1/02 ,  C09J7/25 ,  C09J7/29

Abstract: Provided are a polyester film, a laminated film, and the like for protecting an organic EL module of a foldable display each of which is free of occurrence of a crack at a folding portion thereof, in order to provide a foldable display excellent in mass productivity, and free of a risk of causing distortion in an image displayed at a folding portion thereof after being repeatedly folded. The polyester film for protecting an organic EL module of a foldable display satisfies the following conditions: (1) a refractive index in a bending direction is from 1.590 to 1.620; (2) a refractive index in a folding portion direction is from 1.670 to 1.700; (3) a refractive index in a thickness direction is 1.520 or less; and (4) a density is 1.380 g/cm3 or more, wherein the bending direction refers to a direction orthogonal to a folding portion of the polyester film at a time when the polyester film is folded.

公开(公告)号：US20250034342A1

公开(公告)日：2025-01-30

申请号：US18713454

申请日：2022-11-17

Applicant: TOYOBO CO., LTD.

Inventor： Taichi ZUSHI ,  Akira SHIMIZU ,  Shotaro NISHIO

IPC: C08J5/18 ,  B32B27/08 ,  B32B27/36

Abstract: Provided is a biaxially stretched polyester film having good print visibility and a smooth surface by material-recycling a film to be discarded. Provided is also a biaxially stretched polyester film which can be used as a substrate film in a release film for producing a resin sheet. A biaxially stretched polyester film has a haze of 2% or more and 15% or less and a surface roughness SRa of at least one surface of 5 nm or more and 40 nm or less.

公开(公告)号：US20240276862A1

公开(公告)日：2024-08-15

申请号：US18643154

申请日：2024-04-23

Applicant: TOYOBO CO., LTD.

Inventor： Shotaro NISHIO ,  Kiwamu KAWAI ,  Akira SHIMIZU ,  Katsuya ITO

IPC: H10K77/10 ,  B32B7/023 ,  B32B7/12 ,  B32B27/34 ,  H10K102/00

CPC classification number: H10K77/111 ,  B32B7/023 ,  B32B7/12 ,  B32B27/34 ,  B32B2255/10 ,  B32B2457/20 ,  H10K2102/311

Abstract: Provided is a polyester film for foldable displays that is unlikely to have cracks in the folding portion with the aim of providing a foldable display that is excellent in mass production applicability, and that does not have image distortion that may appear in the folding portion after the display is repeatedly folded. The polyester film has a thickness of 10 to 80 μm, a refractive index in the bending direction of 1.590 to 1.620, a refractive index in the direction of a folding portion of 1.670 to 1.700, a refractive index in the thickness direction of 1.520 or less, and a density of 1.380 g/cm3 or more, wherein the bending direction refers to a direction orthogonal to the folding portion of the polyester film to be folded.

公开(公告)号：US20230374234A1

公开(公告)日：2023-11-23

申请号：US18044845

申请日：2021-09-29

Applicant: TOYOBO CO., LTD.

Inventor： Kiwamu KAWAI ,  Akira SHIMIZU ,  Isao TAKII

IPC: C08J5/18 ,  C08J7/043 ,  C09J7/25 ,  C09J7/29 ,  C09J201/00

CPC classification number: C08J5/18 ,  C08J7/043 ,  C09J7/255 ,  C09J7/29 ,  C09J201/00 ,  C08J2367/02 ,  C09J2467/006 ,  C08J2400/00 ,  G09F2003/023

Abstract: The invention provides a biaxially oriented polyester film with 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 can be used to provide a molded body, a label or the like. The biaxially oriented polyester film has a 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 of 0.5-5.0% by mole; a haze change when heated at 150° C. for 30 minutes of 5.0% or less; a limiting viscosity of the constituent polyester resin of 0.59-0.65 dl/g; an average storage elastic modulus at 150° C. of 5.0-7.6×108 (Pa); and an acid value of 40-60 eq/ton.

公开(公告)号：US20220085307A1

公开(公告)日：2022-03-17

申请号：US17429119

申请日：2020-01-15

Applicant: TOYOBO CO., LTD.

Inventor： Shotaro NISHIO ,  Kiwamu KAWAI ,  Akira SHIMIZU ,  Katsuya ITO

IPC: H01L51/00 ,  B32B7/12 ,  B32B27/34 ,  B32B7/023

Abstract: Provided is a polyester film for foldable displays that is unlikely to have cracks in the folding portion with the aim of providing a foldable display that is excellent in mass production applicability, and that does not have image distortion that may appear in the folding portion after the display is repeatedly folded. The polyester film has a thickness of 10 to 80 μm, a refractive index in the bending direction of 1.590 to 1.620, a refractive index in the direction of a folding portion of 1.670 to 1.700, a refractive index in the thickness direction of 1.520 or less, and a density of 1.380 g/cm3 or more, wherein the bending direction refers to a direction orthogonal to the folding portion of the polyester film to be folded.