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    CELLULOSE ACETATE AND PRODUCING METHOD THEREFOR
    7.
    发明申请
    CELLULOSE ACETATE AND PRODUCING METHOD THEREFOR 审中-公开

    公开(公告)号：US20190218312A1

    公开(公告)日：2019-07-18

    申请号：US16327054

    申请日：2017-08-21

    申请人： DAICEL CORPORATION

    发明人： Maiko TSUDA ,  Akihiro HIGUCHI

    IPC分类号： C08B3/06 ,  C08B1/02 ,  C08B17/02

    CPC分类号： C08B3/06 ,  B02C7/16 ,  B02C13/04 ,  C08B1/02 ,  C08B17/02

    摘要： The purpose of the present invention is to provide a cellulose acetate which can be used to obtain an optical film having a very small amount of bright spot foreign matters, with excellent production efficiency, even when cellulose containing a small amount of hemicellulose components and having a high degree of crystallinity is used as a raw material. A cellulose acetate in which a content ratio by mole of mannose units to a sum of xylose units, mannose units and glucose units, which are sugar chain components, is 0.04 mol % or less, and a filtration index K measured by the following measurement method is 30 mL−1 or less. (Measurement method) The cellulose acetate is dissolved in a mixed solvent containing methylene chloride and methanol at a weight ratio of methylene chloride/methanol of 9/1 to obtain a solution with a solid concentration of 16% by weight. The temperature of the solution is adjusted to 25° C., and the solution is subjected to constant-pressure filtration under a pressure of 3 kg/cm2 using a cloth obtained by stacking three sheets of calico (s 618) (diameter: 15 mm, filtration area: 1.77 cm2). At this time, the filtration index k (mL−1) is calculated from the following expression, where P1 represents the amount of filtration (mL) up to 20 minutes after the start of filtration, and P2 represents the amount of filtration (mL) from 0 to 60 minutes. Filtration   index   K = 2 - P 2 / P 1 P 1 + P 2 × 10 4 [ Mathematical   Formula   1 ]

    MODIFIED CELLULOSE FINE FIBERS AND METHOD FOR PRODUCING THE SAME
    8.
    发明申请
    MODIFIED CELLULOSE FINE FIBERS AND METHOD FOR PRODUCING THE SAME 审中-公开

    公开(公告)号：US20180312609A1

    公开(公告)日：2018-11-01

    申请号：US15769836

    申请日：2016-10-27

    申请人： KRI, Inc.

    发明人： Lianzhen LIN ,  Ayako MARUTA

    IPC分类号： C08B3/06 ,  C08B3/08 ,  C08L1/10 ,  C08J5/24

    CPC分类号： C08B3/06 ,  C08B3/08 ,  C08B3/10 ,  C08B3/20

    摘要： Modified fine cellulose fibers are produced by impregnating a cellulose with a reactive fibrillation solution or mixture containing a catalyst including a base catalyst or an organic acid catalyst, a monobasic carboxylic anhydride, and an aprotic solvent having a donor number of not less than 26 to esterify and chemically fibrillate the cellulose. This method provides a simple efficient process for producing modified fine cellulose fibers that have a diameter from several nano-meters to submicrometers, a large aspect ratio, a high degree of crystallinity, less damage in the shape or crystalline structure of the fine fibers, a large aspect ratio, and an excellent dispersibility in an organic solvent; The catalyst may contain a pyridine compound. The monobasic carboxylic anhydride may be a C2-4aliphatic monocarboxylic anhydride. The resulting modified fine cellulose fibers modified with a monobasic carboxylic anhydride may have a degree of crystallinity of not less than 70%, an average fiber diameter of 20 to 800 nm, and an average fiber length of 1 to 200 μm.