利索-全球专利检索

  1. 登录
  2. 注册

搜索结果

46 条记录 (耗时 0.015 秒)

    Cellulose acetate and producing method therefor
    2.
    发明授权
    Cellulose acetate and producing method therefor 有权

    公开(公告)号：US10927189B2

    公开(公告)日：2021-02-23

    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 ,  B02C7/16 ,  B02C13/04

    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 ]

    CELLULOSE ACETATE AND PRODUCING METHOD THEREFOR
    3.
    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 ]

    Plant for continuous production of cellulose triacetate in a heterogeneous phase
    4.
    发明授权
    Plant for continuous production of cellulose triacetate in a heterogeneous phase 失效
    在异质相中连续生产三乙酸纤维素的工厂

    公开(公告)号：US3785775A

    公开(公告)日：1974-01-15

    申请号：US3785775D

    申请日：1971-07-19

    申请人： MIKHALSKY F ,  LEVI M ,  LEVI Y ,  RYABTSEV A ,  RUDENKO P ,  KULESH P ,  PURLOV J ,  GASPARIANTS A

    发明人： MIKHALSKY F ,  GASPARIANTS A ,  PURLOV J ,  KULESH P ,  RUDENKO P ,  RYABTSEV A ,  LEVI Y ,  LEVI M

    IPC分类号： C08B1/02 ,  C08B3/06 ,  C08B3/22 ,  C08B17/02 ,  B01J3/02 ,  B01J4/00

    CPC分类号： C08B3/22 ,  C08B1/02 ,  C08B3/06 ,  C08B17/02

    摘要： A plant for continuous production of cellulose triacetate in a heterogeneous phase, comprising consecutively arranged apparatus for activating, acetylation and benzene washings, benzene stripping, partial saponification, water washings and final product drying. The apparatus for activating, the apparatus for acetylation and benzene washings, the apparatus for benzene stripping and the partial saponification apparatus are interconnected by connecting adaptors for conveying the fibrous reaction mass from one apparatus to another and provided with means for creating therein a sealing plug from the conveyed reaction mass. Said means for the creation of the sealing plug is in the form of a screw conveyer with a valve arranged at its discharge orifice and spring-loaded in the direction opposite to the direction of the fibrous reaction mass conveying.

    摘要翻译： 一种用于连续生产不均一相的三醋酸纤维素的设备，包括用于活化，乙酰化和苯洗涤的连续排列的装置，苯汽提，部分皂化，水洗和最后的产品干燥。 用于激活的装置，用于乙酰化和苯洗涤的装置，用于苯汽提的装置和部分皂化装置通过用于将纤维反应物料从一个装置输送到另一装置的连接适配器相互连接并且设置有用于在其中形成密封塞的装置 传达的反应物质。 用于产生密封塞的所述装置是螺旋输送机的形式，其中阀设置在其排放孔处，并且沿与纤维反应物质输送方向相反的方向弹簧加载。