GB1505077A - Porous diaphragms - Google Patents

Porous diaphragms

Info

Publication number
GB1505077A
GB1505077A GB28804/74A GB2880474A GB1505077A GB 1505077 A GB1505077 A GB 1505077A GB 28804/74 A GB28804/74 A GB 28804/74A GB 2880474 A GB2880474 A GB 2880474A GB 1505077 A GB1505077 A GB 1505077A
Authority
GB
United Kingdom
Prior art keywords
sheets
fluorine
ptfe
sheet
containing polymer
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
GB28804/74A
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.)
Imperial Chemical Industries Ltd
Original Assignee
Imperial Chemical 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 Imperial Chemical Industries Ltd filed Critical Imperial Chemical Industries Ltd
Priority to GB28804/74A priority Critical patent/GB1505077A/en
Priority to ZA754091A priority patent/ZA754091B/en
Priority to BE157761A priority patent/BE830739A/en
Priority to CA230,328A priority patent/CA1046217A/en
Priority to IT24904/75A priority patent/IT1039523B/en
Priority to DE19752529153 priority patent/DE2529153A1/en
Publication of GB1505077A publication Critical patent/GB1505077A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B13/00—Diaphragms; Spacing elements
    • C25B13/04—Diaphragms; Spacing elements characterised by the material
    • C25B13/08—Diaphragms; Spacing elements characterised by the material based on organic materials
    • 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
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
    • B32B27/20—Layered products comprising a layer of synthetic resin characterised by the use of special additives using fillers, pigments, thixotroping agents
    • 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
    • C08J5/12—Bonding of a preformed macromolecular material to the same or other solid material such as metal, glass, leather, e.g. using adhesives
    • C08J5/124—Bonding of a preformed macromolecular material to the same or other solid material such as metal, glass, leather, e.g. using adhesives using adhesives based on a macromolecular component
    • C08J5/128—Adhesives without diluent
    • 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

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Medicinal Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Polymers & Plastics (AREA)
  • Manufacturing & Machinery (AREA)
  • Electrochemistry (AREA)
  • Metallurgy (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
  • Laminated Bodies (AREA)
  • Manufacture Of Macromolecular Shaped Articles (AREA)

Abstract

1505077 Seaming non-metallic sheet material IMPERIAL CHEMICAL INDUSTRIES Ltd 20 June 1975 [28 June 1974] 28804/74 Heading B5K [Also in Division C3] A porous diaphragm for an electrolytic cell is made from a plurality of sheets of filled polytetrafluoroethylene, i.e. polytetrafluoroethylene sheets containing removable solid particulate additive, by fusing a fluorine-containing polymer into the sheets at or near juxtaposed edges of the sheets at a temperature which will not substantially decompose the filler in the sheets, solidifying the fluorine-containing polymer so as to effect joining of the sheets and thereafter removing filler from the thus joined sheet. In one embodiment, juxtaposed edges of two filled polytetrafluoroethylene sheets are overlapped with a strip of the fluorine-containing polymer. Heat and pressure is applied between heated platens to effect joining. The platens may be lightly greased with silicone grease to prevent sticking. In another embodiment, one or more strips of fluorine-containing polymer are made to partially overlap and are fused to one or more edges of a filled PTFE sheet. The protruding portions of the strips are used to bond the sheet to other PTFE sheets which have not had strips fused to their edges. In a modification, the strips are replaced by tabs at intervals along one or more edges of a filled PTFE sheet. Preferably, the temperature at which the fluorine-containing polymer is fused into the PTFE sheet is lower than the melting point of PTFE. Specified fluorine-containing polymers are polychlorotrifluoroethylene, polyvinylidene fluoride, a fluorinated ethylene/propylene copolymer or an ethylene/chlorotrifluoroethylene copolymer. Specified fillers for the PTFE are starch, e.g. maize and/or potato starch, waterinsoluble inorganic bases or carbonates, e.g. calcium carbonate, and cellulose. In addition, the PTFE may contain a non-removable filler, e.g. titanium dioxide, to render the diaphragm wettable when installed in an electrolytic cell. In Example 1, laminated starch-filled PTFE sheets prepared according to Example 1 of Specification 1,424,804 and having a mesh gauze woven of monofilament polypropylene yarn laminated thereto are butt-joined using an FEP strip laid along and fused to the butt joint. In Example 2, the polypropylene gauze is replaced by an FEP backing sheet. In Example 3, cellulose is used as filler and an FEP backing sheet is used. In Example 4, starch is used as filler, an FEP backing sheet is used and the fluorine-containing polymer is a strip of a copolymer of ethylene and chlorotrifluoroethylene.
GB28804/74A 1974-06-28 1974-06-28 Porous diaphragms Expired GB1505077A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
GB28804/74A GB1505077A (en) 1974-06-28 1974-06-28 Porous diaphragms
ZA754091A ZA754091B (en) 1974-06-28 1975-06-26 Porous diaphragms
BE157761A BE830739A (en) 1974-06-28 1975-06-27 PROCESS FOR MANUFACTURING A POROUS DIAPHRAGM
CA230,328A CA1046217A (en) 1974-06-28 1975-06-27 Porous diaphragms
IT24904/75A IT1039523B (en) 1974-06-28 1975-06-27 POROUS DIAPHRAGMS
DE19752529153 DE2529153A1 (en) 1974-06-28 1975-06-30 POROESE DIAPHRAGMS

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB28804/74A GB1505077A (en) 1974-06-28 1974-06-28 Porous diaphragms

Publications (1)

Publication Number Publication Date
GB1505077A true GB1505077A (en) 1978-03-22

Family

ID=10281450

Family Applications (1)

Application Number Title Priority Date Filing Date
GB28804/74A Expired GB1505077A (en) 1974-06-28 1974-06-28 Porous diaphragms

Country Status (6)

Country Link
BE (1) BE830739A (en)
CA (1) CA1046217A (en)
DE (1) DE2529153A1 (en)
GB (1) GB1505077A (en)
IT (1) IT1039523B (en)
ZA (1) ZA754091B (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0028943A1 (en) * 1979-11-13 1981-05-20 Asahi Glass Company Ltd. Method of bonding ion exchange membrane of fluorinated polymer to synthetic resin
GB2121352A (en) * 1982-05-25 1983-12-21 Chlorine Eng Corp Ltd Bonding of cation exchange membrane
US5762741A (en) * 1993-12-21 1998-06-09 E.I. Du Pont De Nemours And Company Method for bonding polymeric articles
WO2004062888A1 (en) * 2003-01-06 2004-07-29 E. I. Du Pont De Nemours And Company Fluoropolymer sealant

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8600401D0 (en) * 1986-01-08 1986-02-12 Hydrogen Systems Nv Ion-permeable diaphragms
DE102010015192A1 (en) * 2010-04-16 2011-10-20 Astrium Gmbh Method for biocompatible connection of a multifunctional PTFE membrane or film with a plastic part

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0028943A1 (en) * 1979-11-13 1981-05-20 Asahi Glass Company Ltd. Method of bonding ion exchange membrane of fluorinated polymer to synthetic resin
GB2121352A (en) * 1982-05-25 1983-12-21 Chlorine Eng Corp Ltd Bonding of cation exchange membrane
US5762741A (en) * 1993-12-21 1998-06-09 E.I. Du Pont De Nemours And Company Method for bonding polymeric articles
WO2004062888A1 (en) * 2003-01-06 2004-07-29 E. I. Du Pont De Nemours And Company Fluoropolymer sealant
US7348377B2 (en) 2003-01-06 2008-03-25 E.I. Du Pont De Nemours And Company Fluoropolymer sealant
CN100445078C (en) * 2003-01-06 2008-12-24 纳幕尔杜邦公司 Fluoropolymer sealant

Also Published As

Publication number Publication date
DE2529153A1 (en) 1976-02-26
ZA754091B (en) 1977-02-23
BE830739A (en) 1975-10-16
CA1046217A (en) 1979-01-16
IT1039523B (en) 1979-12-10

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee