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GB1475316A - Preparation of porous polytetrafluoroethylene sheets - Google Patents

Preparation of porous polytetrafluoroethylene sheets

Info

Publication number
GB1475316A
GB1475316A GB1218974A GB1218974A GB1475316A GB 1475316 A GB1475316 A GB 1475316A GB 1218974 A GB1218974 A GB 1218974A GB 1218974 A GB1218974 A GB 1218974A GB 1475316 A GB1475316 A GB 1475316A
Authority
GB
United Kingdom
Prior art keywords
sheet
cooling roll
roll
stretched
stretching
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
GB1218974A
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.)
Sumitomo Electric Industries Ltd
Original Assignee
Sumitomo Electric 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
Priority claimed from JP3083473A external-priority patent/JPS5140902B2/ja
Priority claimed from JP3083373A external-priority patent/JPS5330748B2/ja
Priority claimed from JP48030832A external-priority patent/JPS49118760A/ja
Application filed by Sumitomo Electric Industries Ltd filed Critical Sumitomo Electric Industries Ltd
Publication of GB1475316A publication Critical patent/GB1475316A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • 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
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/006—Pressing and sintering powders, granules or fibres
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/022—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the choice of material
    • 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
    • B29C67/00—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00
    • B29C67/20—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00 for porous or cellular articles, e.g. of foam plastics, coarse-pored
    • 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
    • B29C67/00—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00
    • B29C67/20—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00 for porous or cellular articles, e.g. of foam plastics, coarse-pored
    • B29C67/205—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00 for porous or cellular articles, e.g. of foam plastics, coarse-pored comprising surface fusion, and bonding of particles to form voids, e.g. sintering
    • 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
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18—Manufacture of films or sheets
    • 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
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/22—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of indefinite length
    • B29C43/24—Calendering
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/07—Flat, e.g. panels
    • B29C48/08—Flat, e.g. panels flexible, e.g. films
    • 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
    • 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
    • C08J2327/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers
    • C08J2327/02—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment
    • C08J2327/12—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
    • C08J2327/18—Homopolymers or copolymers of tetrafluoroethylene

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)

Abstract

1475316 Porous PTFE film SUMITOMO ELECTRIC INDUSTRIES Ltd 19 March 1974 [19 March 1973 (3)] 12189/74 Heading B5B [Also in Divisions C3 and C7] A porous sheet of polytetrafluoroethylene is made by extruding and/or rolling an unsintered polytetrafluoroethylene mixture containing a liquid lubricant at below 327‹ C. to form a sheet, stretching the extruded and/or rolled sheet at least uniaxially at below 327‹ C., the stretching being carried out at a absolute speed of 1 cm./min.-20 m./min and to produce a stretching ratio of 1 : 1À1 to 1 : 10 and then heating the stretched sheet to a temperature of at least 327‹ C. by urging the stretched sheet against a moving endless mirror-surface belt positioned over a heating roll and a cooling roll at a position adjacent one side of the cooling roll and peeling off the sheet from the endless belt on the opposite side of the cooling roll thereby continuously sintering the sheet. In the examples a mixture of polytetrafluoroethylene powder and a petroleum fraction of boiling point 150-250‹ C. is mixed, extruded into a strip which is rolled in two directions at right angles to form a sheet which is treated with trichloroethylene to remove the petroleum, dried and then stretched and finally sintered. The sintering may be carried out by passing the sheet, S, overheating roll 1 and cooling roll 2 via an endless belt 3 which has a polished mirror-surface, auxiliary rolls 5 and 6 (i) urging S against belt 3 and (ii) peeling off S respectively. The porous sheet may be used as a membrane filter, electrolytic diaphragm or diaphragm for fuel cells.
GB1218974A 1973-03-19 1974-03-19 Preparation of porous polytetrafluoroethylene sheets Expired GB1475316A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP3083473A JPS5140902B2 (en) 1973-03-19 1973-03-19
JP3083373A JPS5330748B2 (en) 1973-03-19 1973-03-19
JP48030832A JPS49118760A (en) 1973-03-19 1973-03-19

Publications (1)

Publication Number Publication Date
GB1475316A true GB1475316A (en) 1977-06-01

Family

ID=27287109

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1218974A Expired GB1475316A (en) 1973-03-19 1974-03-19 Preparation of porous polytetrafluoroethylene sheets

Country Status (7)

Country Link
AU (1) AU470481B2 (en)
CA (1) CA1033132A (en)
DE (1) DE2413221C3 (en)
FR (1) FR2222200B1 (en)
GB (1) GB1475316A (en)
IT (1) IT1015859B (en)
SE (1) SE387886B (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2193214A (en) * 1986-05-29 1988-02-03 Thomas Ronald Thomas Porous ptfe
GB2211190A (en) * 1987-10-19 1989-06-28 Gore & Ass Rapid recoverable ptfe and a process for its manufacture
US4877661A (en) * 1987-10-19 1989-10-31 W. L. Gore & Associates, Inc. Rapidly recoverable PTFE and process therefore
US5026513A (en) * 1987-10-19 1991-06-25 W. L. Gore & Associates, Inc. Process for making rapidly recoverable PTFE
GB2242431A (en) * 1990-03-31 1991-10-02 Gore & Ass Porous PTFE structures
US5677031A (en) * 1990-03-31 1997-10-14 W. L. Gore & Associates, Inc. Porous PTFE structures
US6436135B1 (en) 1974-10-24 2002-08-20 David Goldfarb Prosthetic vascular graft
WO2006058233A1 (en) 2004-11-24 2006-06-01 Donaldson Company, Inc. Ptfe membrane
CN114770992A (en) * 2022-04-22 2022-07-22 睿得新材料科技(佛山)有限公司 Preparation method of polytetrafluoroethylene stretching belt, stretching belt and preparation device

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS603842B2 (en) * 1976-09-03 1985-01-31 住友電気工業株式会社 Asymmetric pore diameter thin film material and its manufacturing method
US4110392A (en) * 1976-12-17 1978-08-29 W. L. Gore & Associates, Inc. Production of porous sintered PTFE products
CA1147109A (en) * 1978-11-30 1983-05-31 Hiroshi Mano Porous structure of polytetrafluoroethylene and process for production thereof
JPS587334A (en) * 1981-07-04 1983-01-17 Sumitomo Electric Ind Ltd Method for manufacturing string-like porous material
JPS58145735A (en) * 1982-02-22 1983-08-30 Daikin Ind Ltd Method for manufacturing polytetrafluoroethylene porous material
JPH07119053B2 (en) * 1988-06-03 1995-12-20 旭硝子株式会社 Filling polytetrafluoroethylene molding method

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1049584A (en) * 1963-03-29 1966-11-30 Tri Point Ind Inc Improvements in or relating to laminates
DE1704663A1 (en) * 1967-12-12 1971-09-23 Hoechst Ag Process for sintering polytetrafluoroethylene foils
CA962021A (en) * 1970-05-21 1975-02-04 Robert W. Gore Porous products and process therefor

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6436135B1 (en) 1974-10-24 2002-08-20 David Goldfarb Prosthetic vascular graft
GB2193214A (en) * 1986-05-29 1988-02-03 Thomas Ronald Thomas Porous ptfe
GB2211190A (en) * 1987-10-19 1989-06-28 Gore & Ass Rapid recoverable ptfe and a process for its manufacture
US4877661A (en) * 1987-10-19 1989-10-31 W. L. Gore & Associates, Inc. Rapidly recoverable PTFE and process therefore
US5026513A (en) * 1987-10-19 1991-06-25 W. L. Gore & Associates, Inc. Process for making rapidly recoverable PTFE
US5308664A (en) * 1987-10-19 1994-05-03 W. L. Gore & Associates, Inc. Rapidly recoverable PTFE and process therefore
GB2242431B (en) * 1990-03-31 1994-05-11 Gore & Ass Porous PTFE structures
US5677031A (en) * 1990-03-31 1997-10-14 W. L. Gore & Associates, Inc. Porous PTFE structures
GB2242431A (en) * 1990-03-31 1991-10-02 Gore & Ass Porous PTFE structures
WO2006058233A1 (en) 2004-11-24 2006-06-01 Donaldson Company, Inc. Ptfe membrane
US7922946B2 (en) 2004-11-24 2011-04-12 Donaldson Company, Inc. PTFE membrane
CN101065424B (en) * 2004-11-24 2011-09-14 唐纳森公司 Ptfe membrane
US9409132B2 (en) 2004-11-24 2016-08-09 Donaldson Company, Inc. PTFE membrane
CN114770992A (en) * 2022-04-22 2022-07-22 睿得新材料科技(佛山)有限公司 Preparation method of polytetrafluoroethylene stretching belt, stretching belt and preparation device

Also Published As

Publication number Publication date
SE387886B (en) 1976-09-20
DE2413221A1 (en) 1974-10-17
FR2222200A1 (en) 1974-10-18
FR2222200B1 (en) 1977-06-17
DE2413221C3 (en) 1982-10-21
AU6685074A (en) 1975-09-25
DE2413221B2 (en) 1977-07-07
CA1033132A (en) 1978-06-20
IT1015859B (en) 1977-05-20
AU470481B2 (en) 1976-03-18

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PE20 Patent expired after termination of 20 years

Effective date: 19940318