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    Process for the preparation of porous polyolefin particles
    4.
    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
    6.
    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
    7.
    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。

    MICRO-PARTICLES CONTAINING A 3-D POLYMERIC STRUCTURE
    9.
    发明申请
    MICRO-PARTICLES CONTAINING A 3-D POLYMERIC STRUCTURE 有权

    公开(公告)号：US20150057367A1

    公开(公告)日：2015-02-26

    申请号：US14474217

    申请日：2014-09-01

    Applicant: Bridgestone Corporation

    Inventor： Xiaorong Wang ,  Mindaugas Rackaitis ,  Naruhiko Mashita ,  Victor Foltz

    IPC: C08J9/28 ,  C08J9/36

    CPC classification number: C08J9/28 ,  C08J9/36 ,  C08J2201/0522 ,  C08J2201/0542 ,  C08J2353/00 ,  C09K19/544 ,  C11D17/0039 ,  H01F1/44

    Abstract: Micro-sized particles having a polymeric structure of cells are provided. Also provided is a method of producing micro-sized particles having a polymeric structure comprising: (1) forming a homogenous solution by heating a mixture of a high molecular weight polymer and a low molecular weight material, wherein said low molecular weight material makes up at least about 50% by weight of the homogenous solution, (2) forming a dispersed solution by dispersing the homogenous solution formed in step (1) into an inert material, (3) cooling the dispersed solution to cause the high molecular weight polymer to phase separate from the low molecular weight material, (4) forming solid particles comprised of said low molecular weight material trapped inside a structure of cells of said high molecular weight polymer, and (5) removing the solid particles from the dispersed solution.

    METHOD FOR PRODUCING POROUS STRUCTURES FROM SYNTHETIC POLYMERS
    10.
    发明申请
    METHOD FOR PRODUCING POROUS STRUCTURES FROM SYNTHETIC POLYMERS 有权
    从合成聚合物生产多孔结构的方法

    公开(公告)号：US20100310853A1

    公开(公告)日：2010-12-09

    申请号：US12867040

    申请日：2009-02-11

    Applicant: Stefan Schwiegk ,  Axel Wilms ,  Ronald Frans Maria Lange ,  Michael Siemer ,  Giovanni D'Andola ,  Volker Rauschenberger ,  Frank Hermanutz ,  Frank Gaehr

    Inventor： Stefan Schwiegk ,  Axel Wilms ,  Ronald Frans Maria Lange ,  Michael Siemer ,  Giovanni D'Andola ,  Volker Rauschenberger ,  Frank Hermanutz ,  Frank Gaehr

    IPC: B32B3/26 ,  B29C44/56

    CPC classification number: C08J9/28 ,  B29C67/202 ,  C08J2201/0542 ,  C08J2377/00 ,  Y10T428/249976

    Abstract: A process for producing porous structures from polyamide by dissolving the polyamide in an ionic liquid and precipitating or coagulating the dissolved polyamide by contacting the solution with a liquid precipitant medium. Fibers are produced from the dissolved polyamide in a wet-spinning process by precipitation in protic solvents, in particular water, a C1-4-alkanol or mixtures thereof, and subsequent freeze-drying. Foils, films or coatings are produced by blade coating the dissolved polyamide onto a substrate surface, optionally spraying with protic solvent, in particular water, a C1-4-alcohol or mixtures thereof, dipping into a precipitation or coagulation bath, freeze-drying of the resulting foil, of the film or of the coated substrate. Molded parts are prepared by extracting the dissolved polyamide with protic solvents, preferably water, a C1-4-alcohol or mixtures thereof, wherein the dissolved polymer is transformed to a solid or wax-like state by cooling and extracted after subsequent moulding.

    Abstract translation: 通过将聚酰胺溶解在离子液体中并通过使溶液与液体沉淀剂介质接触使溶解的聚酰胺沉淀或凝结来从聚酰胺制造多孔结构的方法。 通过在质子溶剂，特别是水，C 1-4链烷醇或其混合物中沉淀，然后冷冻干燥，在湿纺丝方法中，由溶解的聚酰胺生产纤维。 通过将溶解的聚酰胺刮涂到基材表面上，任选地喷涂质子溶剂，特别是水，C1-4醇或其混合物，将其浸入沉淀或凝固浴中，冷冻干燥 所得到的箔，膜或涂覆的基底。 通过用质子溶剂，优选水，C 1-4醇或其混合物萃取溶解的聚酰胺来制备模制部件，其中通过冷却将溶解的聚合物转化为固体或蜡状状态，并在随后的模塑之后提取。

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