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453 条记录 (耗时 0.041 秒)

    VOID-CONTAINING POLYESTER FILM AND METHOD FOR PRODUCING SAME
    21.
    发明申请
    VOID-CONTAINING POLYESTER FILM AND METHOD FOR PRODUCING SAME 审中-公开

    公开(公告)号：US20190084206A1

    公开(公告)日：2019-03-21

    申请号：US16086825

    申请日：2017-03-22

    申请人： TOYOBO CO., LTD.

    发明人： Shoji Deguchi ,  Kenji Yoshino

    IPC分类号： B29C47/00 ,  B29B17/00 ,  B29C55/04

    摘要： A void-containing polyester is disclosed which is excellent in concealing properties, whiteness, and thermal dimensional stability. A void-containing polyester film includes an internal void-containing layer (layer A). The void-containing layer contains a polyester matrix resin and a polypropylene dispersed resin, and satisfies the following requirements (1) to (3), and an apparent density of the film is in a range of 0.8 to 1.2 g/cm3. (1) A melt viscosity (η1) of the polyester resin at a melting temperature of 280° C. and a shear rate of 121.6 sec−1 is 90 to 400 Pa·s (2) A melt viscosity (η2) of the polypropylene resin at a melting temperature of 280° C. and a shear rate of 121.6 sec−1 is 300 to 850 Pa·s (3) A melt viscosity ratio (η2/η1) of the polyester resin and the polypropylene resin at a melting temperature of 280° C. and a shear rate of 121.6 sec−1 is 1.5 to 4.5

    Method of producing retardation film, method of producing circularly polarizing plate, and film-stretching apparatus, involving braking the moving speeds of film-holding clips
    24.
    发明授权
    Method of producing retardation film, method of producing circularly polarizing plate, and film-stretching apparatus, involving braking the moving speeds of film-holding clips 有权

    公开(公告)号：US10086556B2

    公开(公告)日：2018-10-02

    申请号：US15120435

    申请日：2015-04-07

    申请人： NITTO DENKO CORPORATION

    发明人： Takashi Shimizu ,  Makoto Nakaichi ,  Ryuuichi Kira ,  Satoshi Hirata

    IPC分类号： B29C55/04 ,  B29B13/02 ,  G02F1/1335 ,  G02B5/30 ,  G02F1/13363 ,  B29C55/20 ,  B29D11/00 ,  C08J5/18 ,  B29C55/16 ,  B29L11/00

    摘要： Provided is a method capable of producing a retardation film having an elongated shape and having a slow axis in an oblique direction with high production efficiency while precisely controlling the direction of the slow axis and the variation of the direction. The method of producing a retardation film of the present invention includes: holding the left and right end portions of a film with left and right variable pitch-type clips configured to have clip pitches changing in a longitudinal direction, respectively; preheating the film; obliquely stretching the film; and releasing the clips holding the film. The oblique stretching includes making the change ratio of the clip pitch of the clips on one side in the traveling direction thereof and the change ratio of the clip pitch of the clips on the other side in the traveling direction thereof different from each other, and/or making the position at which the clip pitch of the clips on the one side in the traveling direction starts to change and the position at which the clip pitch of the clips on the other side in the traveling direction starts to change different from each other, while extending a distance between the left and right clips. In the present invention, the moving speeds of the clips are braked immediately before the holding step and/or during a time period from the holding step to the oblique stretching step.