GB1475316A - Preparation of porous polytetrafluoroethylene sheets - Google Patents
Preparation of porous polytetrafluoroethylene sheetsInfo
- 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
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
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.
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)
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)
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 | Preparation of stringy porous product |
JPS58145735A (en) * | 1982-02-22 | 1983-08-30 | Daikin Ind Ltd | Production of porous polytetrafluoroethylene article |
JPH07119053B2 (en) * | 1988-06-03 | 1995-12-20 | 旭硝子株式会社 | Filling polytetrafluoroethylene molding method |
Family Cites Families (3)
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 |
SE392582B (en) * | 1970-05-21 | 1977-04-04 | Gore & Ass | PROCEDURE FOR THE PREPARATION OF A POROST MATERIAL, BY EXPANDING AND STRETCHING A TETRAFLUORETENE POLYMER PREPARED IN AN PASTE-FORMING EXTENSION PROCEDURE |
-
1974
- 1974-03-18 SE SE7403615A patent/SE387886B/en not_active IP Right Cessation
- 1974-03-19 CA CA195,441A patent/CA1033132A/en not_active Expired
- 1974-03-19 GB GB1218974A patent/GB1475316A/en not_active Expired
- 1974-03-19 AU AU66850/74A patent/AU470481B2/en not_active Expired
- 1974-03-19 DE DE2413221A patent/DE2413221C3/en not_active Expired
- 1974-03-19 FR FR7409286A patent/FR2222200B1/fr not_active Expired
- 1974-03-21 IT IT49422/74A patent/IT1015859B/en active
Cited By (14)
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 |
AU470481B2 (en) | 1976-03-18 |
DE2413221C3 (en) | 1982-10-21 |
IT1015859B (en) | 1977-05-20 |
AU6685074A (en) | 1975-09-25 |
DE2413221A1 (en) | 1974-10-17 |
FR2222200A1 (en) | 1974-10-18 |
FR2222200B1 (en) | 1977-06-17 |
DE2413221B2 (en) | 1977-07-07 |
CA1033132A (en) | 1978-06-20 |
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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 |