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    2.
    发明专利
    未知

    公开(公告)号：DE69327286T2

    公开(公告)日：2000-05-11

    申请号：DE69327286

    申请日：1993-09-13

    Applicant: DAICEL CHEM

    Inventor： SAKA SHIRO ,  MATSUMURA HIROYUKI ,  HABU NAOTO ,  KAINO YOSHIAKI ,  IWATA RYOUTA ,  ASAI TANEMI ,  SHIMAMOTO SHU

    IPC: C08B3/06 ,  C08B3/00 ,  C08B3/22

    Abstract: A fatty acid ester of cellulose excellent in transparency, filterability and spinnability in spite of its high content of mannose and xylose, wherein the total molar content of mannose and xylose accounts for at least 7% of that of glucose, mannose and xylose, and the amount of filtration satisfies a specified requirement. Such a fatty acid ester of cellulose is prepared by using a pulp having a low alpha -cellulose content as a raw material and a fatty acid corresponding to the ester as a diluent and adding an organic solvent in an amount of at least 10% by weight based on the diluent in any step during the preparation. In the preparation of cellulose diacetate, which is excellent in filterability and transparency, by the acetic acid process, the cellulose diacetate obtained by aging is dissolved in a solvent which can dissolve it and the resulting cellulose diacetate is recovered.

    4.
    发明专利
    未知

    公开(公告)号：DE69327286D1

    公开(公告)日：2000-01-20

    申请号：DE69327286

    申请日：1993-09-13

    Applicant: DAICEL CHEM

    Inventor： SAKA SHIRO ,  MATSUMURA HIROYUKI ,  HABU NAOTO ,  KAINO YOSHIAKI ,  IWATA RYOUTA ,  ASAI TANEMI ,  SHIMAMOTO SHU

    IPC: C08B3/06 ,  C08B3/00 ,  C08B3/22

    Abstract: A fatty acid ester of cellulose excellent in transparency, filterability and spinnability in spite of its high content of mannose and xylose, wherein the total molar content of mannose and xylose accounts for at least 7% of that of glucose, mannose and xylose, and the amount of filtration satisfies a specified requirement. Such a fatty acid ester of cellulose is prepared by using a pulp having a low alpha -cellulose content as a raw material and a fatty acid corresponding to the ester as a diluent and adding an organic solvent in an amount of at least 10% by weight based on the diluent in any step during the preparation. In the preparation of cellulose diacetate, which is excellent in filterability and transparency, by the acetic acid process, the cellulose diacetate obtained by aging is dissolved in a solvent which can dissolve it and the resulting cellulose diacetate is recovered.

    CELLULOSE ACETATE
    6.
    发明专利
    CELLULOSE ACETATE 失效

    公开(公告)号：JP2000154201A

    公开(公告)日：2000-06-06

    申请号：JP32916498

    申请日：1998-11-19

    Applicant: DAICEL CHEM

    Inventor： SHUDO YUICHIRO ,  TANIGUCHI HIROKI ,  ASAI TANEMI ,  OZAKI TORU

    IPC: C08B3/06

    Abstract: PROBLEM TO BE SOLVED: To obtain a formed item having excellent mechanical properties by forming a cellulose acetate having a specific value of an average acetylation degree, viscosity average polymerization degree of not less than a specific value and loss tangent of not less than a specific value. SOLUTION: This cellulose acetate has an average acetylation degree of 55-59%, viscosity average polymerization degree of not less than 220 and loss tangent tan δ of dynamic viscoelasticity of not less than 220 measured at 1 Hz and at 25 deg.C. The cellulose acetate includes cellulose acetate butylate including a cellulose acetate as a major component and a mixture of a cellulose acetate and an inorganic acid. The cellulose acetate is manufactured by adding 9-18 pts.wt. of sulfuric acid, 200-400 pts.wt. of acetic acid anhydride and 300-600 pts.wt. of acetic acid to 100 pts.wt. of a pre-treated and activated cellulose acetate, reacting them under stirring at 50-85 deg.C, neutralizing the mixture by adding a liquid mixture of acetic acid, water and magnesium acetate when the reaction is finished, introducing steam in a closed system and ageing thereof at 50-75 deg.C for 90-240 minutes for saponification.

    CELLULOSE ACETATE
    7.
    发明专利
    CELLULOSE ACETATE 失效

    公开(公告)号：JP2000256401A

    公开(公告)日：2000-09-19

    申请号：JP5997499

    申请日：1999-03-08

    Applicant: DAICEL CHEM

    Inventor： ASAI TANEMI ,  TANIGUCHI HIROKI ,  SHUDO YUICHIRO

    IPC: C08B3/06

    Abstract: PROBLEM TO BE SOLVED: To provide a cellulose acetate for obtaining a fiber being excellent in mechanical strength when the fiber is particularly made therefrom by controlling a Y value that relater an acetylation degree with a polymerization degree to be in a specific range. SOLUTION: This is cellulose acetate which has a Y value obtained by calculating a formula: Y=(-3.22×10-2A)+(6.47×10-4B)+2.903 [wherein A is an acetylation degree (%); B is a 6 wt.% viscosity (mPa.s)] being in the range of -1.90

    Cellulose ester and its film
    8.
    发明专利
    Cellulose ester and its film 有权
    纤维素酯及其薄膜

    公开(公告)号：JP2005281645A

    公开(公告)日：2005-10-13

    申请号：JP2004102043

    申请日：2004-03-31

    Applicant: Daicel Chem Ind Ltd ,  ダイセル化学工業株式会社

    Inventor： SHIMAMOTO SHU ,  ASAI TANEMI

    IPC: G02B5/30 ,  B29C55/02 ,  B29K1/00 ,  B29L7/00 ,  B29L11/00 ,  C08B3/16

    Abstract: PROBLEM TO BE SOLVED: To provide a cellulose ester having high drawability and moderate intrinsic birefringence and controlling retardation over a wide range and to provide a film composed of the cellulose ester.
    SOLUTION: A mixed fatty acid cellulose ester has 2.0-2.8 average degree of substitution of total acyl groups and 0.50-0.85 average degree of substitution of acyl groups at the 6-position of glucose unit and 10×10
    4 to 30×10
    4 weight-average molecular weight expressed in terms of PMMA. The ratio (molar ratio) of the acetyl group to the propionyl group or butyryl group is (2/98) to (60/40) of the former to the latter. The cellulose ester has a large dispersity (Mw/Mn), a lower maximum molecular weight Mp and number-average molecular weight Mn than Mw and Mp/Mn>2 in relation to the molecular weight. The cellulose ester is useful for forming an optical film (e.g. an optical compensation film for a liquid crystal display device or a protective film for a polarizing plate).
    COPYRIGHT: (C)2006,JPO&NCIPI

    Abstract translation: 要解决的问题：提供具有高拉伸性和适度内在双折射并且在宽范围内控制延迟的纤维素酯，并提供由纤维素酯组成的膜。 解决方案：混合脂肪酸纤维素酯在葡萄糖单元的6位上具有2.0-2.8的平均取代度，葡萄糖单元的6-位平均取代度为0.50-0.85，10×10 4 以PMMA表示的重均分子量为30×10 SP 3。 乙酰基与丙酰基或丁酰基的比例（摩尔比）为前者的比例为（2/98）至（60/40）。 纤维素酯相对于分子量具有分散性（Mw / Mn）大，Mw最大分子量Mp和数均分子量Mn，Mw / Mn> 2。 纤维素酯可用于形成光学膜（例如用于液晶显示装置的光学补偿膜或用于偏振片的保护膜）。 版权所有（C）2006，JPO＆NCIPI

    CELLULOSE DIACETATE
    9.
    发明专利
    CELLULOSE DIACETATE 审中-公开

    公开(公告)号：JP2003176301A

    公开(公告)日：2003-06-24

    申请号：JP2002344250

    申请日：2002-11-27

    Applicant: DAICEL CHEM

    Inventor： HANIYU NAOTO ,  KAINO YOSHIAKI ,  IWATA RYOTA ,  ASAI TANEMI ,  SHIMAMOTO SHU

    IPC: C08B3/06

    Abstract: PROBLEM TO BE SOLVED: To obtain cellulose diacetate having excellent filterability. SOLUTION: This cellulose diacetate has the total of mol fraction of xylose and mannose being ≥3.3% the total of mol fraction of xylose, mannose and glucose in constituent saccharide analysis. (1) The amount of precipitation component obtained in centrifugal separation of 2 wt.% acetone solution at 8,000 rpm for 30 minutes is ≤0.2% the whole sample contained in the solution and (2) the amount of precipitation component obtained in centrifugal separation of 2 wt.% acetone solution at 50,000 rpm for 3 hours is ≥1.1% of the whole sample contained in the solution. COPYRIGHT: (C)2003,JPO

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