CA2031827A1 - Process for producing multilayer polytetrafluoroethylene porous membrane - Google Patents

Process for producing multilayer polytetrafluoroethylene porous membrane

Info

Publication number
CA2031827A1
CA2031827A1 CA002031827A CA2031827A CA2031827A1 CA 2031827 A1 CA2031827 A1 CA 2031827A1 CA 002031827 A CA002031827 A CA 002031827A CA 2031827 A CA2031827 A CA 2031827A CA 2031827 A1 CA2031827 A1 CA 2031827A1
Authority
CA
Canada
Prior art keywords
porous membrane
extrudate
liquid lubricant
producing multilayer
polytetrafluoroethylene porous
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.)
Granted
Application number
CA002031827A
Other languages
French (fr)
Other versions
CA2031827C (en
Inventor
Shinji Tamaru
Katsutoshi Yamamoto
Osamu Tanaka
Hirofumi Nishibayashi
Osamu Inoue
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Daikin Industries Ltd
Original Assignee
Shinji Tamaru
Katsutoshi Yamamoto
Osamu Tanaka
Hirofumi Nishibayashi
Osamu Inoue
Daikin Industries, Ltd.
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 Shinji Tamaru, Katsutoshi Yamamoto, Osamu Tanaka, Hirofumi Nishibayashi, Osamu Inoue, Daikin Industries, Ltd. filed Critical Shinji Tamaru
Publication of CA2031827A1 publication Critical patent/CA2031827A1/en
Application granted granted Critical
Publication of CA2031827C publication Critical patent/CA2031827C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
    • B29C55/005—Shaping by stretching, e.g. drawing through a die; Apparatus therefor characterised by the choice of materials
    • 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
    • B01D69/12—Composite membranes; Ultra-thin membranes
    • 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
    • B01D69/12—Composite membranes; Ultra-thin membranes
    • B01D69/1212—Coextruded layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
    • B01D71/06—Organic material
    • B01D71/30—Polyalkenyl halides
    • B01D71/32—Polyalkenyl halides containing fluorine atoms
    • B01D71/36—Polytetrafluoroethene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
    • B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
    • B29C55/023—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets using multilayered plates or sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2027/00—Use of polyvinylhalogenides or derivatives thereof as moulding material
    • B29K2027/12—Use of polyvinylhalogenides or derivatives thereof as moulding material containing fluorine
    • B29K2027/18—PTFE, i.e. polytetrafluorethene, e.g. ePTFE, i.e. expanded polytetrafluorethene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/04—Condition, form or state of moulded material or of the material to be shaped cellular or porous

Abstract

A process for producing a multilayer polytetrafluoro-ethylene porous membrane comprising at least two layers having different average pore diameters is disclosed, the process comprising the steps of: filling the inside of a cylinder of an extruding mold distinctively with at least two kinds of polytetrafluoroethylene fine powders with each of which a liquid lubricant has been mixed; subsequently paste-extruding the powders to obtain a multilayer extrudate, which is then optionally rolled; and then stretching the extrudate or the rolled extrudate at least monoaxially after the liquid lubricant is removed therefrom or without removing the liquid lubricant.
CA002031827A 1989-12-07 1990-12-07 Process for producing multilayer polytetrafluoroethylene porous membrane Expired - Lifetime CA2031827C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP1320273A JPH078926B2 (en) 1989-12-07 1989-12-07 Method for producing polytetrafluoroethylene multilayer porous membrane
JPHEI.1-320273 1989-12-07

Publications (2)

Publication Number Publication Date
CA2031827A1 true CA2031827A1 (en) 1991-06-08
CA2031827C CA2031827C (en) 2002-09-03

Family

ID=18119663

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002031827A Expired - Lifetime CA2031827C (en) 1989-12-07 1990-12-07 Process for producing multilayer polytetrafluoroethylene porous membrane

Country Status (12)

Country Link
US (1) US5064593A (en)
EP (1) EP0433787B1 (en)
JP (1) JPH078926B2 (en)
KR (1) KR0150640B1 (en)
CN (1) CN1030690C (en)
AU (1) AU623068B2 (en)
BR (1) BR9006236A (en)
CA (1) CA2031827C (en)
DE (1) DE69019694T2 (en)
ES (1) ES2075123T3 (en)
PL (1) PL165872B1 (en)
RU (1) RU2045328C1 (en)

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Also Published As

Publication number Publication date
CA2031827C (en) 2002-09-03
JPH03179038A (en) 1991-08-05
PL288123A1 (en) 1991-08-12
BR9006236A (en) 1991-09-24
RU2045328C1 (en) 1995-10-10
EP0433787A1 (en) 1991-06-26
US5064593A (en) 1991-11-12
EP0433787B1 (en) 1995-05-24
KR0150640B1 (en) 1998-10-01
PL165872B1 (en) 1995-02-28
AU623068B2 (en) 1992-04-30
JPH078926B2 (en) 1995-02-01
CN1052434A (en) 1991-06-26
AU6784690A (en) 1991-06-13
ES2075123T3 (en) 1995-10-01
DE69019694D1 (en) 1995-06-29
KR910011458A (en) 1991-08-07
DE69019694T2 (en) 1995-09-21
CN1030690C (en) 1996-01-17

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