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    METHOD FOR PRODUCING STRETCHED FILM
    1.
    发明公开
    METHOD FOR PRODUCING STRETCHED FILM 审中-实审

    公开(公告)号：EP4434724A1

    公开(公告)日：2024-09-25

    申请号：EP22895457.4

    申请日：2022-11-04

    申请人： KANEKA CORPORATION

    发明人： KAMIKARIYA, Naoya

    IPC分类号： B29C55/02 ,  B29C48/08 ,  B29C48/88 ,  B29C55/04 ,  B29C55/14 ,  C08J5/18 ,  B29K67/00 ,  B29L7/00

    CPC分类号： B29C48/08 ,  B29C48/88 ,  B29C55/02 ,  B29C55/04 ,  B29C55/14 ,  C08J5/18

    摘要： A method for producing a stretched film containing a poly(3-hydroxybutyrate) resin includes the steps of: (i) melting a film raw material and extruding the molten film raw material onto a cast roll to mold a film; (ii) separating the film from the cast roll to obtain a film having a crystallinity of 20 to 45%; and (iii-a) stretching the film in an MD direction to obtain a film having a crystallinity of 30 to 55%. The method may further include either or both of the steps of: (iii-b) stretching the film in a TD direction to obtain a film having a crystallinity of 30 to 60%; and (iv) heating the film to a temperature higher than a temperature during the step (iii-a) or (iii-b) to obtain a film having a crystallinity of 60% or more.

    STRETCHED FILM, LAMINATE, AND PACKAGE
    6.
    发明公开
    STRETCHED FILM, LAMINATE, AND PACKAGE 审中-公开

    公开(公告)号：EP4279248A1

    公开(公告)日：2023-11-22

    申请号：EP22739303.0

    申请日：2022-01-05

    申请人： Prime Polymer Co., Ltd.

    发明人： SEKIYA Keiko ,  OGUNI Michihiko

    IPC分类号： B29C55/02 ,  C08J5/18

    摘要： A stretched film including a polyethylene-based resin composition satisfying the following requirements (1) to (3): (1) a melt flow rate (190°C, 2.16 kg load) is 0.01 g/10 min or more and 2.0 g/10 min or less; (2) a density is 935 kg/m 3 or more and 970 kg/m 3 or less; and (3) a ratio of a melt index (I 21 : 190°C, 21.6 kg load) to a melt index (I 2 : 190°C, 2.16 kg load), I 21 /I 2 is 80 or more.