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    Para-aromatic polyamide porous film
    12.
    发明公开
    Para-aromatic polyamide porous film 失效
    对位芳香族聚酰胺多孔膜

    公开(公告)号：EP0757071A3

    公开(公告)日：1997-02-19

    申请号：EP96111605.0

    申请日：1996-07-18

    Applicant: SUMITOMO CHEMICAL COMPANY, LIMITED

    Inventor： Takahashi, Tsutomu ,  Tateno, Tatsuo ,  Tsujimoto, Yoshifumu

    IPC: C08J9/28 ,  C08J5/18 ,  C08J3/09 ,  H01M2/16

    CPC classification number: C08J9/26 ,  C08J5/18 ,  C08J9/28 ,  C08J2201/0542 ,  C08J2377/10 ,  H01M2/162 ,  H01M2/1653 ,  Y10T428/31725

    Abstract: A para-oriented aromatic polyamide porous film, which comprises fibrils having a diameter of not more than 1 µm and which has such a structure that the fibrils are planary arranged in the form of a network or nonwoven fabric and laminated in the form of a layer, wherein the thermal linear expansion coefficient at 200 to 300°C of the film is within ±50 x 10 -6 /°C and a percentage of vacant spaces is from 30 to 95% and a battery separator using the porous film are described. Furthermore, a process for producing the porous film is described, which comprises the following steps (a) to (c):
    (a) forming a film-like material from a solution containing 1 to 10% by weight of a para-oriented aromatic polyamide having an inherent viscosity of 1.0 to 2.8 dl/g and 1 to 10% by weight of a chloride of an alkali metal or an alkali earth metal in a polar amide solvent or a polar urea solvent; (b) maintaining the film-like material at a temperature of not less than 20°C or not more than -5°C to deposit the para-oriented aromatic polyamide; and (c) immersing the film-like material obtained in step (b) in an aqueous solution or an alcoholic solution to elute the solvent and chloride of the alkali metal or alkali earth metal, followed by drying to obtain the para-oriented aromatic polyamide porous film. It is to provide a para-aramid porous film having uniformity and fine vacant spaces, which can not be accomplished by a nonwoven fabric, a process for producing the same and a battery separator produced by using the para-aramid porous film, by making use of characteristics of a para-aramid (e.g. high heat resistance, high rigidity, high strength, etc.).

    Abstract translation: 一种对位取向芳族聚酰胺多孔膜，其包含直径不大于1μm的原纤维，并且具有这样的结构，即原纤维以网状或无纺织物的形式平面排列并层压成层状 其中，所述膜的200〜300℃下的热线膨胀系数在±50×10 -6 /℃以内，空余空隙的比例为30〜95％，并且记载了使用该多孔膜的电池用隔膜。 此外，描述了用于生产多孔膜的方法，其包括以下步骤（a）至（c）：（a）由包含1至10重量％的对位取向的芳族化合物的溶液形成膜状材料 在极性酰胺溶剂或极性尿素溶剂中具有特性粘度为1.0至2.8dl / g和1至10重量％的碱金属或碱土金属氯化物的聚酰胺; （b）将膜状材料保持在不低于20℃或不高于-5℃的温度以沉积对位取向的芳族聚酰胺; （c）将步骤（b）中获得的膜状材料浸入水溶液或醇溶液中以洗脱碱金属或碱土金属的溶剂和氯化物，随后干燥以获得对位取向的芳族聚酰胺 多孔膜。 本发明提供一种无纺布无法实现的具有均匀性和微细空隙的对位芳族聚酰胺多孔膜及其制造方法，以及使用该对位芳族聚酰胺多孔膜制作的电池用隔膜， 对芳族聚酰胺的特性（例如高耐热性，高刚性，高强度等）。

    Process for the preparation of porous polyolefin particles
    17.
    发明授权
    Process for the preparation of porous polyolefin particles 失效
    制备多孔聚烯烃颗粒的方法

    公开(公告)号：US6051618A

    公开(公告)日：2000-04-18

    申请号：US92141

    申请日：1998-06-05

    Applicant: Ronald Tabaksblat ,  Hendricus F. Aussems

    Inventor： Ronald Tabaksblat ,  Hendricus F. Aussems

    IPC: A61K9/00 ,  A61K47/32 ,  C08J9/28

    CPC classification number: C08J9/28 ,  C08J2201/0542 ,  C08J2323/02

    Abstract: The invention relates to a process for the preparation of porous polyolefin particles, which process comprises the following steps:1) dissolution of at least one crystallizable polyolefin in a solvent, which results in a solution being formed which comprises 0.1-50 wt. % polyolefin, and the initial polyolefin solution formed containing between 5 ppm and 20 wt. % of nucleating agent,2) dispersion of the resulting polyolefin solution in a non-solvent, at a temperature that is higher than the crystallization temperature of the polyolefin in the polyolefin solution, upon which a multiphase system is formed,3) cooling of the multiphase system, with simultaneous stirring, the cooling rate being between 0.05 and 10.degree. C./min, down to a temperature which is below the crystallization temperature of the polyolefin in the polyolefin solution, so that strong, polyolefin-containing particles are formed,4) separation of the polyolefin-containing particles from the liquid(s),5) drying of the polyolefin-containing particles at a temperature that is below the crystallization temperature of the polyolefin in the initial polyolefin solution.

    Abstract translation: 本发明涉及一种制备多孔聚烯烃颗粒的方法，该方法包括以下步骤：1）将至少一种可结晶聚烯烃溶解在溶剂中，其形成溶液，其包含0.1-50wt。 ％聚烯烃和形成的初始聚烯烃溶液，其含有5ppm至20wt。 ％的成核剂，2）在高于聚烯烃溶液中的聚烯烃的结晶温度的温度下，将所得聚烯烃溶液分散在非溶剂中，在其上形成多相体系，3）冷却 多相体系，同时搅拌，冷却速度为0.05〜10℃/ min，降至低于聚烯烃溶液中的聚烯烃的结晶温度的温度，从而形成强的含聚烯烃的颗粒， 4）将含聚烯烃的颗粒与液体分离，5）在低于聚烯烃初始聚烯烃溶液中的结晶温度的温度下干燥含聚烯烃的颗粒。

    Process for making porous membranes
    19.
    发明授权
    Process for making porous membranes 失效
    制造多孔膜的方法

    公开(公告)号：US5229045A

    公开(公告)日：1993-07-20

    申请号：US761508

    申请日：1991-09-18

    Applicant: Giorgio Soldani

    Inventor： Giorgio Soldani

    IPC: A61L27/00 ,  A61L27/14 ,  A61L27/56 ,  C08J9/28

    CPC classification number: C08J9/28 ,  A61L27/14 ,  A61L27/56 ,  C08J2201/0542 ,  Y10S623/921

    Abstract: Porous, distensible, gel-like membranes which in tubular form are suitable as implants, e.g., vascular prostheses and a process for the preparation thereof. The membranes are formed by a spraying, phase-inversion technique which employs thermodynamically unstable polymer solutions and is accomplished by separately spraying the unstable solution and a nonsolvent onto a rotating surface. Prostheses from the highly porous tubular membranes have shown a high degree of patency and completeness of the healing process and are useful for direct implantation in the body or for extracorporeal vascular accesses.

    Porous cellulose beads
    20.
    发明授权
    Porous cellulose beads 失效
    多孔纤维素珠

    公开(公告)号：US4090022A

    公开(公告)日：1978-05-16

    申请号：US779950

    申请日：1977-03-21

    Applicant: George T. Tsao ,  Li Fu Chen

    Inventor： George T. Tsao ,  Li Fu Chen

    IPC: C08J9/28 ,  C12N11/12 ,  C08B15/10 ,  C08B16/00

    CPC classification number: C08J9/28 ,  C12N11/12 ,  C08J2201/0542 ,  C08J2301/00 ,  Y10S530/814

    Abstract: Porous cellulose beads are prepared by distributing droplets of a solvent mixture containing a cellulose derivative into a precipitating solution to form porous beads which are then washed and hydrolyzed to form porous cellulose beads. The porous cellulose beads, which may be cross-linked, if desired, by suitable treatment, are useful carriers to which enzymes can be immobilized. The beads may also be used for the separation of enzymes, proteins, nucleic acids and the like, or to remove metal ions from dilute mining solutions.

    Abstract translation: 通过将含有纤维素衍生物的溶剂混合物的液滴分散到沉淀溶液中以形成多孔珠来制备多孔纤维素珠，然后将其洗涤并水解形成多孔纤维素珠。 如果需要，通过适当的处理可以交联的多孔纤维素珠粒是可以固定酶的有用的载体。 珠也可用于分离酶，蛋白质，核酸等，或从稀释的溶液中除去金属离子。

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