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    POLYMETHYL METHACRYLATE HOLLOW YARN ULTRA-FILTRATION MEMBRANE AND PROCESS FOR ITS PRODUCTION
    1.
    发明专利
    POLYMETHYL METHACRYLATE HOLLOW YARN ULTRA-FILTRATION MEMBRANE AND PROCESS FOR ITS PRODUCTION 未知

    公开(公告)号：DE3273047D1

    公开(公告)日：1986-10-09

    申请号：DE3273047

    申请日：1982-10-28

    Applicant: TORAY INDUSTRIES

    Inventor： NOGI TATSUO ,  IWAMI TOMONORI ,  TANAKA KAZUMI

    IPC: B01D69/08 ,  B01D71/40 ,  D01D5/24 ,  D01F6/16

    Abstract: PCT No. PCT/JP82/00422 Sec. 371 Date Jun. 30, 1983 Sec. 102(e) Date Jun. 30, 1983 PCT Filed Oct. 28, 1982 PCT Pub. No. WO83/01632 PCT Pub. Date May 11, 1983.The present invention relates to a hollow fiber type ultrafiltration membrane comprising a material of polymethyl methacrylate series in which no crosslinking is formed substantially and a process for its preparation. By employing adequate conditions, this material which is easy to handle makes it possible to achieve a steady manufacturing process and a constant quality of product. The obtained membrane is excellent in selective permeability and bio-compatibility, and expected to show its effect mainly in medical applications such as separation of plasma.

    INFUSIBILIZATION OF PITCH FIBER
    7.
    发明专利
    INFUSIBILIZATION OF PITCH FIBER 失效

    公开(公告)号：JPH01282329A

    公开(公告)日：1989-11-14

    申请号：JP11401988

    申请日：1988-05-10

    Applicant: TORAY INDUSTRIES

    Inventor： MATSUMOTO TADAYUKI ,  IWAMI TOMONORI

    IPC: D01F9/15 ,  D01F9/14

    Abstract: PURPOSE:To obtain the subject infusibilized fiber capable of providing a carbon fiber with high strength and elongation and excellent in handling properties at a low cost by carbonization by oxidizing a pitch fiber with a specified diameter in a nitric acid solution in a range satisfying a specified relation about the reaction period, the reaction temperature and the concentration of nitric acid. CONSTITUTION:A mesophase pitch is melted and degassed at 320 deg.C under 60mm Hg using a bented extruder, etc., subsequently discharged through a spinning nozzle and drawn to prepare a pitch yarn with

    POLYMETHYL METHACRYLATE SEPARATION MEMBRANE AND PREPARATION THEREOF
    8.
    发明专利
    POLYMETHYL METHACRYLATE SEPARATION MEMBRANE AND PREPARATION THEREOF 失效

    公开(公告)号：JPS5876104A

    公开(公告)日：1983-05-09

    申请号：JP17309981

    申请日：1981-10-30

    Applicant: TORAY INDUSTRIES

    Inventor： NOGI TATSUO ,  IWAMI TOMONORI ,  TANAKA KAZUSANE

    IPC: C02F1/44 ,  A61M1/18 ,  B01D71/40 ,  C08J9/28 ,  C08L33/00 ,  C08L33/02 ,  C08L33/04 ,  C08L33/12 ,  D01F6/16

    Abstract: PURPOSE:To provide a polymethyl methacrylate separation membrane suitable for concentrating a solution and separating a substance therefrom by precise filtration or ultrafiltration, having an isotactic part and a syndiotactic part for which the permeability of albumin and the permeation amount of water are respectively prescribed. CONSTITUTION:A base polymer comprising a polymethyl methacrylate polymer with an average MW of 100,000 or more, especially, about 200,000-1,500,000 which is a mixture consisting of a polymer relatively high in isotacticity and a polymer relatively high in syndiotacticity is prepared. In the next step, this base polymer is dissolved in a solvent finally replaceable with water such as dimethylsulfoxide or dimethylformamide and, to the resulting solution, water and a surfactant are further added in order to control a fine pore size. Subsequently, the aforementioned solution for which the polymer concn. is adjusted to 5-30% is emitted from hollow metal spinneret pores held at 500 deg.C or more and solidified. The obtained titled separation membrane has albumin permeability of 30% or more and water permeation amount (water UFR) of 0.1-30/hr.m .mm.Hg.

    MELT-SPINNING OF PITCH
    10.
    发明专利
    MELT-SPINNING OF PITCH 失效

    公开(公告)号：JPS6285031A

    公开(公告)日：1987-04-18

    申请号：JP22364085

    申请日：1985-10-09

    Applicant: TORAY INDUSTRIES

    Inventor： MATSUMOTO TADAYUKI ,  IWAMI TOMONORI ,  SHIOKAWA MICHIHIRO

    IPC: D01D1/10 ,  D01F9/14

    Abstract: PURPOSE:Pitch is melted, degassed and extruded, as the heat history which the pitch undergoes is being controlled, at specific conditions, to obtain carbon fiber stably without yarn breakage and void formation. CONSTITUTION:At first pitch is melted and degassed usually by treating it with reduced pressure. Then, the pitch is extruded out of the nozzles as the heat history the pitch undergoes is being controlled so that the amount of gas formed by pyrolysis becomes less than 0.2ml per 1g of pitch. The spinning of the pitch is preferably effected using a vented extruder.

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