Optical film and optical stack
    2.
    发明授权

    公开(公告)号:US12271015B2

    公开(公告)日:2025-04-08

    申请号:US17605395

    申请日:2020-05-20

    Abstract: An optical film includes a plurality of alternating first and second polymeric layers, such that the first polymeric layers have a smaller average in-plane index of refraction than the second polymeric layers and the first polymeric layers have a glass transition temperature of at least 107 deg. C. The optical film may be a reflective polarizer. An optical stack includes a linear absorbing polarizer and the reflective polarizer disposed on, and bonded to, the absorbing polarizer. The reflective polarizer has an optical reflectance of at least 60% for a first polarization state and an optical transmittance of at least 60% for an orthogonal second polarization state. When heated at 105 deg. C. for 15 minutes, a difference in shrinkage of the reflective polarizer and the absorbing polarizer along the first and second polarization states is greater than about zero and 0.2%, respectively.

    OPTICAL FILM AND OPTICAL STACK
    3.
    发明申请

    公开(公告)号:US20220236466A1

    公开(公告)日:2022-07-28

    申请号:US17605395

    申请日:2020-05-20

    Abstract: An optical film includes a plurality of alternating first and second polymeric layers, such that the first polymeric layers have a smaller average in-plane index of refraction than the second polymeric layers and the first polymeric layers have a glass transition temperature of at least 107 deg. C. The optical film may be a reflective polarizer. An optical stack includes a linear absorbing polarizer and the reflective polarizer disposed on, and bonded to, the absorbing polarizer. The reflective polarizer has an optical reflectance of at least 60% for a first polarization state and an optical transmittance of at least 60% for an orthogonal second polarization state. When heated at 105 deg. C. for 15 minutes, a difference in shrinkage of the reflective polarizer and the absorbing polarizer along the first and second polarization states is greater than about zero and 0.2%, respectively.

    OPTICAL FILM, REFLECTIVE POLARIZER, OPTICAL STACK, AND OPTICAL CONSTRUCTION

    公开(公告)号:US20230168421A1

    公开(公告)日:2023-06-01

    申请号:US17993142

    申请日:2022-11-23

    CPC classification number: G02B5/305 G02B5/045

    Abstract: An optical film includes a plurality of polymeric microlayers disposed between, and co-extruded and co-stretched with, opposing first and second polymeric skins. Each of the polymeric microlayers has an average thickness of less than about 400 nm. Each of the first and second polymeric skins has an average thickness of greater than about 1 micron. At least one of the first and second polymeric skins includes a plurality of polymeric skin layers. Each of the polymeric skin layers has an average thickness of greater than about 0.5 microns. The plurality of polymeric skin layers includes a polymeric second skin layer disposed between polymeric first and third skin layers. The polymeric second skin layer includes one or more of a greater degree of crystallinity, a greater glass transition temperature, a greater modulus, and a greater in-plane birefringence than each of the polymeric first and third skin layers.

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