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
Grant status
Application
Patent type
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

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D71/00Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
    • B01D71/06Organic material
    • B01D71/30Polyalkenyl halides
    • B01D71/32Polyalkenyl halides containing fluorine atoms
    • B01D71/36Polytetrafluoroethene
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D67/00Processes specially adapted for manufacturing semi-permeable membranes for separation processes or apparatus
    • B01D67/0002Organic membrane formation
    • B01D67/0023Organic membrane formation by inducing porosity into non porous precursor membranes
    • B01D67/0025Organic membrane formation by inducing porosity into non porous precursor membranes by mechanical treatment, e.g. pore-stretching
    • B01D67/0027Organic membrane formation by inducing porosity into non porous precursor membranes by mechanical treatment, e.g. pore-stretching by stretching
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/006Pressing and sintering powders, granules or fibres
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C47/00Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C47/0004Extrusion 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
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C67/00Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00
    • B29C67/20Shaping 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
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C67/00Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00
    • B29C67/20Shaping 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
    • B29C67/205Shaping 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
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08JWORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G
    • C08J5/00Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18Manufacture of films or sheets
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/22Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of indefinite length
    • B29C43/24Calendering
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C47/00Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C47/0009Extrusion 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 articles
    • B29C47/0021Flat flexible articles, e.g. sheets, foils or films
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
    • B29KINDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS
    • B29K2027/00Use of polyvinylhalogenides or derivatives thereof as moulding material
    • B29K2027/12Use of polyvinylhalogenides or derivatives thereof as moulding material containing fluorine
    • B29K2027/18PTFE, i.e. polytetrafluorethene, e.g. ePTFE, i.e. expanded polytetrafluorethene, Gore Tex (R)
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08JWORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G
    • C08J2327/00Characterised 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
    • C08J2327/02Characterised 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
    • C08J2327/12Characterised 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
    • C08J2327/18Homopolymers or copolymers of tetrafluoroethylene

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)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP3083473A JPS5140902B2 (en) 1973-03-19 1973-03-19
JP3083273A JPS49118760A (en) 1973-03-19 1973-03-19
JP3083373A JPS5330748B2 (en) 1973-03-19 1973-03-19

Publications (1)

Publication Number Publication Date
GB1475316A true 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 (4)

Country Link
CA (1) CA1033132A (en)
DE (1) DE2413221C3 (en)
FR (1) FR2222200B1 (en)
GB (1) GB1475316A (en)

Cited By (8)

* 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

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 Sumitomo Electric Industries
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
JPH0218977B2 (en) * 1981-07-04 1990-04-27 Sumitomo Electric Industries
JPH027967B2 (en) * 1982-02-22 1990-02-21 Daikin Ind Ltd
JPH07119053B2 (en) * 1988-06-03 1995-12-20 旭硝子株式会社 Filled polytetrafluoroethylene molding method

Family Cites Families (2)

* 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 A process for sintering of polytetrafluoroethylene films

Cited By (13)

* 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

Also Published As

Publication number Publication date Type
CA1033132A1 (en) grant
DE2413221A1 (en) 1974-10-17 application
DE2413221B2 (en) 1977-07-07 application
DE2413221C3 (en) 1982-10-21 grant
CA1033132A (en) 1978-06-20 grant
FR2222200A1 (en) 1974-10-18 application
FR2222200B1 (en) 1977-06-17 grant

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Legal Events

Date Code Title Description
PS Patent sealed
PE20 Patent expired after termination of 20 years

Effective date: 19940318