CA1215505A - Microporous polyolefinic hollow fiber and upward melt-spinning process to produce the same - Google Patents

Microporous polyolefinic hollow fiber and upward melt-spinning process to produce the same

Info

Publication number
CA1215505A
CA1215505A CA000421858A CA421858A CA1215505A CA 1215505 A CA1215505 A CA 1215505A CA 000421858 A CA000421858 A CA 000421858A CA 421858 A CA421858 A CA 421858A CA 1215505 A CA1215505 A CA 1215505A
Authority
CA
Canada
Prior art keywords
fiber
hollow
fibers
precursor
temperature
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
CA000421858A
Other languages
English (en)
French (fr)
Inventor
James J. Lowery
Neil D. Plotkin
Jack Robinson
Original Assignee
Celanese Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Celanese Corp filed Critical Celanese Corp
Application granted granted Critical
Publication of CA1215505A publication Critical patent/CA1215505A/en
Expired legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D5/00—Formation of filaments, threads, or the like
    • D01D5/24—Formation of filaments, threads, or the like with a hollow structure; Spinnerette packs therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D67/00—Processes specially adapted for manufacturing semi-permeable membranes for separation processes or apparatus
    • B01D67/0002—Organic membrane manufacture
    • B01D67/0023—Organic membrane manufacture by inducing porosity into non porous precursor membranes
    • B01D67/0025—Organic membrane manufacture by inducing porosity into non porous precursor membranes by mechanical treatment, e.g. pore-stretching
    • B01D67/0027—Organic membrane manufacture by inducing porosity into non porous precursor membranes by mechanical treatment, e.g. pore-stretching by stretching
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D67/00—Processes specially adapted for manufacturing semi-permeable membranes for separation processes or apparatus
    • B01D67/0081—After-treatment of organic or inorganic membranes
    • B01D67/0083—Thermal after-treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
    • B01D69/08—Hollow fibre membranes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2323/00—Details relating to membrane preparation
    • B01D2323/08—Specific temperatures applied
    • B01D2323/081—Heating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2323/00—Details relating to membrane preparation
    • B01D2323/08—Specific temperatures applied
    • B01D2323/082—Cooling
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
    • Y10T428/2913—Rod, strand, filament or fiber
    • Y10T428/2973—Particular cross section
    • Y10T428/2975—Tubular or cellular

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Manufacturing & Machinery (AREA)
  • Inorganic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Artificial Filaments (AREA)
  • External Artificial Organs (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
  • Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
CA000421858A 1982-02-18 1983-02-17 Microporous polyolefinic hollow fiber and upward melt-spinning process to produce the same Expired CA1215505A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US06/349,795 US4405688A (en) 1982-02-18 1982-02-18 Microporous hollow fiber and process and apparatus for preparing such fiber
US349,795 1982-02-18

Publications (1)

Publication Number Publication Date
CA1215505A true CA1215505A (en) 1986-12-23

Family

ID=23373996

Family Applications (1)

Application Number Title Priority Date Filing Date
CA000421858A Expired CA1215505A (en) 1982-02-18 1983-02-17 Microporous polyolefinic hollow fiber and upward melt-spinning process to produce the same

Country Status (4)

Country Link
US (1) US4405688A (2)
JP (1) JPS59199808A (2)
AU (1) AU567095B2 (2)
CA (1) CA1215505A (2)

Families Citing this family (116)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4530809A (en) * 1980-10-14 1985-07-23 Mitsubishi Rayon Co., Ltd. Process for making microporous polyethylene hollow fibers
JPS59196706A (ja) * 1983-04-22 1984-11-08 Dainippon Ink & Chem Inc 不均質膜およびその製造方法
CS237872B1 (en) * 1983-06-09 1985-11-13 Rudolf Simo Cigarette filtration stick filling and method of this filling making
IL76003A (en) * 1984-08-03 1988-12-30 Biotechnolog Forschung Gmbh Process and apparatus for the bubble-free gassing of liquids
JPS6190705A (ja) * 1984-10-09 1986-05-08 Terumo Corp 中空糸膜の製造方法
US4666763A (en) * 1984-12-07 1987-05-19 Akzona Incorporated Fiber batts and the method of making
JPS61146308A (ja) * 1984-12-21 1986-07-04 Ube Ind Ltd 多孔質ポリプロピレン中空糸又はフイルムの製造法
US4670341A (en) * 1985-05-17 1987-06-02 W. R. Grace & Co. Hollow fiber
WO1987000213A1 (fr) * 1985-06-27 1987-01-15 Mitsubishi Rayon Co., Ltd. Fibre composite creuse et son procede de fabrication
JPS621404A (ja) * 1985-06-27 1987-01-07 Mitsubishi Rayon Co Ltd 多層複合中空繊維状膜及びその製造法
US5110326A (en) * 1985-07-31 1992-05-05 Celanese Corporation Immobilized liquid membrane
ZA865173B (en) * 1985-07-31 1987-03-25 Celanese Corp Immobilized liquid membrane
DE3546091A1 (de) * 1985-12-24 1987-07-02 Kernforschungsz Karlsruhe Querstrom-mikrofilter
US5139529A (en) * 1987-01-20 1992-08-18 Terumo Kabushiki Kaisha Porous polypropylene membrane and methods for production thereof
US4833172A (en) * 1987-04-24 1989-05-23 Ppg Industries, Inc. Stretched microporous material
US4861644A (en) * 1987-04-24 1989-08-29 Ppg Industries, Inc. Printed microporous material
US4859535A (en) * 1987-06-26 1989-08-22 Ube Industries, Ltd Porous hollow-fiber
US4900626A (en) * 1987-07-28 1990-02-13 Rhone-Poulenc Recherches Hollow composite fibers selectively permeable to water vapor
US4818258A (en) * 1987-11-05 1989-04-04 L&H Technologies, Inc. Filter module
US4941897A (en) * 1987-11-05 1990-07-17 L & H Technologies, Inc. Microporous filter and method
AU611244B2 (en) * 1987-12-25 1991-06-06 Terumo Kabushiki Kaisha Medical instrument
US5013439A (en) * 1988-05-12 1991-05-07 Hoechst Celanese Corporation Microporous membranes having increased pore densities and process for making the same
JPH0214011A (ja) * 1988-06-27 1990-01-18 Mitsubishi Rayon Co Ltd 多孔質ポリエチレン繊維
JPH0724742B2 (ja) * 1988-07-25 1995-03-22 テルモ株式会社 ポリプロピレン多孔質中空糸膜およびその製造方法
US4957620A (en) * 1988-11-15 1990-09-18 Hoechst Celanese Corporation Liquid chromatography using microporous hollow fibers
US4976867A (en) * 1989-04-05 1990-12-11 Hoechst Celanese Corporation Systems and methods for predetermining maximum pressure differentials for microporous hollow fibers employed in liquid-liquid extractions
US5160627A (en) * 1990-10-17 1992-11-03 Hoechst Celanese Corporation Process for making microporous membranes having gel-filled pores, and separations methods using such membranes
US5277976A (en) * 1991-10-07 1994-01-11 Minnesota Mining And Manufacturing Company Oriented profile fibers
US5507949A (en) * 1992-03-20 1996-04-16 Monsanto Company Supported liquid membrane and separation process employing same
JP2637890B2 (ja) * 1992-03-20 1997-08-06 モンサント カンパニー 水性溶液から有機化合物を除去する方法
US5284584A (en) * 1992-12-31 1994-02-08 Hoechst Celanese Corporation Hollow fiber membrane fabric - containing cartridges and modules having solvent-resistant thermoplastic tube sheets, and methods for making the same
DE69740003D1 (de) 1996-12-20 2010-11-04 Siemens Water Tech Corp Reinigungsmethode
US6162360A (en) * 1997-12-29 2000-12-19 Monsanto Company Membrane process for making enhanced flavor fluids
US6171607B1 (en) * 1998-09-28 2001-01-09 Fuisz Technologies Ltd. Process and apparatus for producing shearform matrix material
US6642429B1 (en) 1999-06-30 2003-11-04 Kimberly-Clark Worldwide, Inc. Personal care articles with reduced polymer fibers
US6586066B1 (en) * 2000-03-21 2003-07-01 Awi Licensing Company Preglued underlayment composite and associated flooring installation system
US6579343B2 (en) 2001-03-30 2003-06-17 University Of Notre Dame Du Lac Purification of gas with liquid ionic compounds
AUPR421501A0 (en) * 2001-04-04 2001-05-03 U.S. Filter Wastewater Group, Inc. Potting method
AUPR692401A0 (en) 2001-08-09 2001-08-30 U.S. Filter Wastewater Group, Inc. Method of cleaning membrane modules
CA2365817A1 (en) 2001-12-11 2003-06-11 Pierre Cote Methods of making stretched filtering membranes and membrane modules
CZ2002184A3 (cs) * 2002-01-16 2003-09-17 Eidos, S. R. O. Mikroporézní membránová dutá vlákna s podélně proměnnými mechanickými a filtračními vlastnostmi a způsob jejich přípravy
AUPS300602A0 (en) * 2002-06-18 2002-07-11 U.S. Filter Wastewater Group, Inc. Methods of minimising the effect of integrity loss in hollow fibre membrane modules
CA2501628C (en) 2002-10-10 2012-12-04 U.S. Filter Wastewater Group, Inc. A filtration and backwashing arrangement for membrane modules
US7105089B2 (en) * 2003-03-13 2006-09-12 3M Innovative Properties Company Liquid—liquid extraction system and method
US7122709B2 (en) * 2003-03-13 2006-10-17 3M Innovative Properties Company Method for obtaining ethanol
US20040251567A1 (en) * 2003-06-13 2004-12-16 Pierluigi Cappellini Method and system for producing plastic optical fiber
JP2005021510A (ja) * 2003-07-04 2005-01-27 Toyobo Co Ltd 高透水性中空糸型血液浄化器
KR101115173B1 (ko) * 2003-08-29 2012-02-24 지멘스 워터 테크놀로지스 코포레이션 역류
WO2005046849A1 (en) * 2003-11-14 2005-05-26 U.S. Filter Wastewater Group, Inc. Improved module cleaning method
WO2005092799A1 (en) * 2004-03-26 2005-10-06 U.S. Filter Wastewater Group, Inc. Process and apparatus for purifying impure water using microfiltration or ultrafiltration in combination with reverse osmosis
JP4666248B2 (ja) * 2004-05-27 2011-04-06 東洋紡績株式会社 高強度高透水性中空糸膜型血液浄化器
US8790515B2 (en) 2004-09-07 2014-07-29 Evoqua Water Technologies Llc Reduction of backwash liquid waste
AU2005284677B2 (en) * 2004-09-14 2010-12-23 Evoqua Water Technologies Llc Methods and apparatus for removing solids from a membrane module
NZ553771A (en) 2004-09-15 2010-11-26 Siemens Water Tech Corp Continuously variable aeration of membrane filtration system and flow control device when used in such application
US8758622B2 (en) * 2004-12-24 2014-06-24 Evoqua Water Technologies Llc Simple gas scouring method and apparatus
NZ583228A (en) 2004-12-24 2012-05-25 Siemens Industry Inc Cleaning in membrane filtration systems
NZ562786A (en) 2005-04-29 2010-10-29 Siemens Water Tech Corp Chemical clean for membrane filter
SG140229A1 (en) 2005-08-22 2008-03-28 Siemens Water Tech Corp An assembly for water filtration using a tube manifold to minimise backwash
NZ568167A (en) * 2005-12-09 2010-04-30 Siemens Water Tech Corp Reduced backwash volume process
WO2007079540A1 (en) * 2006-01-12 2007-07-19 Siemens Water Technologies Corp. Improved operating strategies in filtration processes
KR20090046966A (ko) * 2006-08-31 2009-05-11 지멘스 워터 테크놀로지스 코포레이션 저압 역세척
US8293098B2 (en) * 2006-10-24 2012-10-23 Siemens Industry, Inc. Infiltration/inflow control for membrane bioreactor
WO2008098309A1 (en) * 2007-02-16 2008-08-21 Siemens Water Technologies Corp. Membrane filtration process and design
US8318028B2 (en) * 2007-04-02 2012-11-27 Siemens Industry, Inc. Infiltration/inflow control for membrane bioreactor
EP2134454B1 (en) * 2007-04-04 2013-08-28 Siemens Industry, Inc. Hollow fibre membrane module with protection screen
US9764288B2 (en) 2007-04-04 2017-09-19 Evoqua Water Technologies Llc Membrane module protection
EP2463017A1 (en) 2007-05-29 2012-06-13 Siemens Industry, Inc. Membrane cleaning with pulsed airlift pump
CN101678283B (zh) * 2007-05-29 2012-09-19 西门子工业公司 使用气升泵的膜清洗
AU2010256746B2 (en) * 2009-06-02 2012-09-27 Evoqua Water Technologies Llc Membrane cleaning with pulsed gas slugs and global aeration
EP2158026A4 (en) * 2007-06-28 2011-06-29 Siemens Industry Inc CLEANING PROCEDURE FOR SIMPLE FILTRATION SYSTEMS
CN102112213B (zh) 2008-07-24 2016-08-03 伊沃夸水处理技术有限责任公司 用于膜过滤模块的框架系统
EP2313172A4 (en) * 2008-08-14 2013-03-13 Siemens Industry Inc BLOCK CONFIGURATION FOR DISTILLATION ON LARGE SCALE MEMBRANE
JP2012500117A (ja) * 2008-08-20 2012-01-05 シーメンス ウォーター テクノロジース コーポレイション 膜濾過システムの逆洗エネルギ効率の改善
US20100050871A1 (en) * 2008-09-03 2010-03-04 Cummins Filtration Ip Inc. Air-Jacketed Coalescer Media with Improved Performance
DE102009008601A1 (de) 2009-02-12 2010-08-19 Novalung Gmbh Vorrichtung zur Behandlung einer biologischen Flüssigkeit
JP2012521279A (ja) 2009-03-26 2012-09-13 ビーエル・テクノロジーズ・インコーポレイテッド 編んでない強化された中空糸膜
AU2010101488B4 (en) 2009-06-11 2013-05-02 Evoqua Water Technologies Llc Methods for cleaning a porous polymeric membrane and a kit for cleaning a porous polymeric membrane
EP2448658B1 (en) 2009-06-26 2014-10-01 BL Technologies, Inc. Non-braided, textile-reinforced hollow fiber membrane
WO2011056895A1 (en) 2009-11-03 2011-05-12 University Of Notre Dame Du Lac Ionic liquids comprising heteraromatic anions
CN102869432B (zh) 2010-04-30 2016-02-03 伊沃夸水处理技术有限责任公司 流体流分配装置
CN103458715B (zh) 2010-08-05 2017-11-03 奥驰亚客户服务公司 一种无烟烟草产品以及其使用和制作方法
BR112013002843A2 (pt) 2010-08-05 2016-06-07 Altria Client Services Inc produtos, sistemas e métodos compostos à base de tabaco não fumígeno
RU2605251C2 (ru) 2010-09-15 2016-12-20 БиЭл Текнолоджиз, Инк. Способ изготовления армированных нитями половолоконных мембран вокруг растворимого сердечника
US9022224B2 (en) 2010-09-24 2015-05-05 Evoqua Water Technologies Llc Fluid control manifold for membrane filtration system
US8529814B2 (en) 2010-12-15 2013-09-10 General Electric Company Supported hollow fiber membrane
CN103958024B (zh) 2011-09-30 2016-07-06 伊沃夸水处理技术有限责任公司 改进的歧管排列
JP2014528354A (ja) 2011-09-30 2014-10-27 エヴォクア ウォーター テクノロジーズ エルエルシーＥｖｏｑｕａ Ｗａｔｅｒ Ｔｅｃｈｎｏｌｏｇｉｅｓｌｌｃ 隔離バルブ
CN104024196B (zh) 2011-12-14 2015-11-25 3M创新有限公司 由非纤维素生物质产生丁醇的方法
US9321014B2 (en) 2011-12-16 2016-04-26 Bl Technologies, Inc. Hollow fiber membrane with compatible reinforcements
US9643129B2 (en) 2011-12-22 2017-05-09 Bl Technologies, Inc. Non-braided, textile-reinforced hollow fiber membrane
CN104160071B (zh) * 2012-01-18 2016-12-21 三菱丽阳株式会社 中空纤维的制造方法和中空纤维的制造装置
JP6155654B2 (ja) * 2012-01-18 2017-07-05 三菱ケミカル株式会社 中空繊維の製造方法および中空繊維の製造装置
JP5927742B2 (ja) * 2012-03-27 2016-06-01 三菱レイヨン株式会社 溶融紡糸装置及び中空状繊維の製造方法
US8975305B2 (en) 2012-02-10 2015-03-10 Kimberly-Clark Worldwide, Inc. Rigid renewable polyester compositions having a high impact strength and tensile elongation
US9022229B2 (en) 2012-03-09 2015-05-05 General Electric Company Composite membrane with compatible support filaments
US8999454B2 (en) 2012-03-22 2015-04-07 General Electric Company Device and process for producing a reinforced hollow fibre membrane
AU2013280452B2 (en) 2012-06-28 2017-07-20 Evoqua Water Technologies Llc A potting method
US9227362B2 (en) 2012-08-23 2016-01-05 General Electric Company Braid welding
AU2013231145B2 (en) 2012-09-26 2017-08-17 Evoqua Water Technologies Llc Membrane potting methods
DE112013004713T5 (de) 2012-09-26 2015-07-23 Evoqua Water Technologies Llc Membransicherungsvorrichtung
KR20150059788A (ko) 2012-09-27 2015-06-02 에보쿠아 워터 테크놀로지스 엘엘씨 침지된 막을 위한 가스 스코어링 장치
WO2015187198A1 (en) 2014-06-06 2015-12-10 Kimberly-Clark Worldwide, Inc. Hollow porous fibers
JP2016529939A (ja) 2013-06-12 2016-09-29 キンバリー クラーク ワールドワイド インコーポレイテッド 多孔質ポリオレフィン繊維から形成された不織布ウェブを含む吸収性物品
AU2014304179B2 (en) 2013-08-09 2017-08-17 Kimberly-Clark Worldwide, Inc. Anisotropic polymeric material
AU2014304180B2 (en) 2013-08-09 2017-05-04 Kimberly-Clark Worldwide, Inc. Technique for selectively controlling the porosity of a polymeric material
HUE061765T2 (hu) 2013-10-02 2023-08-28 Rohm & Haas Electronic Mat Singapore Pte Ltd Berendezés membrán filtrációs modul javítására
EP4458169A3 (en) 2014-03-14 2025-01-15 Altria Client Services LLC Polymer encased smokeless tobacco products
US10239089B2 (en) 2014-03-14 2019-03-26 Altria Client Services Llc Product portion enrobing process and apparatus
WO2015187924A1 (en) 2014-06-06 2015-12-10 Kimberly-Clark Worldwide, Inc. Thermoformed article formed from a porous polymeric sheet
WO2016085712A1 (en) 2014-11-26 2016-06-02 Kimberly-Clark Worldwide, Inc. Annealed porous polyolefin material
JP6596270B2 (ja) * 2014-12-24 2019-10-23 旭化成株式会社 ポリオレフィン微多孔膜の製造方法
AU2015380472B2 (en) 2015-01-30 2021-08-12 Kimberly-Clark Worldwide, Inc. Film with reduced noise for use in an absorbent article
US10869790B2 (en) 2015-01-30 2020-12-22 Kimberly-Clark Worldwide, Inc. Absorbent article package with reduced noise
WO2017011068A1 (en) 2015-07-14 2017-01-19 Evoqua Water Technologies Llc Aeration device for filtration system
CN109069254B (zh) 2016-05-06 2020-07-31 心脏器械股份有限公司 具有局部溶栓药物输送的血液凝块过滤器
WO2025192693A1 (ja) * 2024-03-15 2025-09-18 東レ株式会社 中空糸、中空糸製造用の吐出口金及び中空糸の製造方法

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3423491A (en) * 1964-09-02 1969-01-21 Dow Chemical Co Permselective hollow fibers and method of making
JPS5215627A (en) * 1975-07-09 1977-02-05 Mitsubishi Rayon Co Ltd Porous polypropylene hollow fibers and a process for manufacturing the m
US4020230A (en) * 1975-10-03 1977-04-26 The Dow Chemical Company Microporous polyethylene hollow fibers and process of preparing them
US4082658A (en) * 1977-02-09 1978-04-04 Monsanto Company Hollow fiber membranes of ethylene copolymers and process for use
JPS6018329B2 (ja) * 1977-07-18 1985-05-09 東洋紡績株式会社 多孔質アイソタクチツクポリプロピレン中空糸
JPS6017844B2 (ja) * 1978-03-30 1985-05-07 旭化成工業株式会社 アクリル系繊維の製造法
ZA80465B (en) * 1979-02-13 1981-08-26 Celanese Corp Process for preparing hollow microporous polypropylene fibers
US4290987A (en) * 1979-07-02 1981-09-22 Celanese Corporation Process for preparing microporous hollow fibers

Also Published As

Publication number Publication date
AU1446383A (en) 1984-11-15
AU567095B2 (en) 1987-11-12
US4405688A (en) 1983-09-20
JPH0424444B2 (2) 1992-04-27
JPS59199808A (ja) 1984-11-13

Similar Documents

Publication Publication Date Title
CA1215505A (en) Microporous polyolefinic hollow fiber and upward melt-spinning process to produce the same
US4541981A (en) Method for preparing a uniform polyolefinic microporous hollow fiber
CA1167211A (en) Process for preparing hollow microporous polypropylene fibers
US4290987A (en) Process for preparing microporous hollow fibers
US4664681A (en) Heterogeneous membrane and process for production thereof
US4257997A (en) Solvent stretch process for preparing a microporous film
US5013439A (en) Microporous membranes having increased pore densities and process for making the same
US4384023A (en) Porous polyethylene film
US4401567A (en) Microporous polyethylene hollow fibers
US5435955A (en) Process of producing porous polypropylene hollow fiber and film
US3801692A (en) Production of novel open-celled microporous film
CA1312431C (en) Process for preparing microporous polyethylene film
EP0227832B1 (en) Composite hollow yarn and a process for producing the same
US4530809A (en) Process for making microporous polyethylene hollow fibers
JPH06246139A (ja) 不均質中空繊維膜およびその製造方法
Twarowska-Schmidt et al. Melt-spun asymmetric poly (4-methyl-1-pentene) hollow fibre membranes
EP0342026B1 (en) Microporous membranes having increased pore densities and process for making the same
JPH0712410B2 (ja) 気体分離膜の製造方法
JPS6342006B2 (2)
JPH06246140A (ja) 中空糸不均質膜の製造方法
US5057218A (en) Porous membrane and production process thereof
JPH0262604B2 (2)
JPS59229320A (ja) 溶融・延伸法による不均質膜の製造方法
JPH0450053B2 (2)
JPH02112404A (ja) 多孔質ポリエチレン中空糸及びその製造方法

Legal Events

Date Code Title Description
MKEX Expiry