GB943624A - Permeable plastic materials - Google Patents

Permeable plastic materials

Info

Publication number
GB943624A
GB943624A GB3420060A GB3420060A GB943624A GB 943624 A GB943624 A GB 943624A GB 3420060 A GB3420060 A GB 3420060A GB 3420060 A GB3420060 A GB 3420060A GB 943624 A GB943624 A GB 943624A
Authority
GB
United Kingdom
Prior art keywords
sodium chloride
powdered
sintering
fugitive material
sintered
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
GB3420060A
Inventor
Desmond Frank Bailey
James Yogan Rama I Seevaratnam
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.)
Doulton and Co Ltd
Original Assignee
Doulton and Co 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 Doulton and Co Ltd filed Critical Doulton and Co Ltd
Priority to GB3420060A priority Critical patent/GB943624A/en
Publication of GB943624A publication Critical patent/GB943624A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • C08J9/26—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof by elimination of a solid phase from a macromolecular composition or article, e.g. leaching out
    • 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)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
  • Filtering Materials (AREA)

Abstract

A method of making a sintered body of permeable P.T.F.E comprises mixing P.T.F.E., which has not previously been subjected to a heat treatment above 327 DEG C., in powdered form with a powdered fugitive material which is capable of being removed from the mixture at temperatures below that at which the P.T.F.E. is sintered subjecting the powdered mixture to pressure to shape it to the form required, and subjecting the shaped form thus produced to heat treatment to sinter the P.T.F.E., the fugitive material being removed during or subsequent to the sintering process. The fugitive material can be one which is volatile and is removed during the sintering or one which is dissolved out from the sintered product. Specified are polymethylmethacrylate, polystyrene, cellulose acetobutyrate, volatile salts, e.g. ammonium bicarbonate, and soluble salts. In examples preforms are prepared by pressing in a mould mixtures of P.T.F.E. and (1) poly methyl methacrylate, (2) sodium chloride, (3) ammonium bicarbonate and (4) sodium chloride and poly methyl methacrylate. Sintering is effected at 370 DEG C. Sodium chloride is dissolved out of the product obtained in Examples (2) and (4).ALSO:A method of making a sintered body of permeable P.T.F.E suitable for use as filter materials comprises mixing P.T.F.E., which has not previously been subjected to a heat treatment above 327 DEG C. in powdered form with a powdered fugitive material which is capable of being removed from the mixture at temperatures below that at which the P.T.F.E. is sintered, subjecting the powdered mixture to pressure to shape it to the form required, and subjecting the shaped form thus produced to heat treatment to sinter the P.T.F.E., the fugitive material being removed during or subsequent to the sintering process. The fugitive material can be one which is volatile and is removed during the sintering or one which is dissolved out from the sintered product. Specified are polymethylmethacrylate, polystyrene, cellulose acetobutyrate, volatile salts, e.g. ammonium bicarbonate, and soluble salts. In examples preforms are prepared by pressing in a mould mixtures of P.T.F.E. and (1) poly methyl methacrylite, (2) sodium chloride, (3) ammonium bicarbonate and (4) sodium chloride and poly methyl methacrylate. Sintering is effected at 370 DEG C. Sodium chloride is dissolved out of the product obtained in examples (2) and (4). An attachment member for a filter element comprising shaped bodies of the material may consist of an integrally moulded peripheral ring of solid P.T.F.E. Alternatively the porous element may be sprayed over selected areas with a metal so as to build up an attachment member.
GB3420060A 1960-10-05 1960-10-05 Permeable plastic materials Expired GB943624A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3420060A GB943624A (en) 1960-10-05 1960-10-05 Permeable plastic materials

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3420060A GB943624A (en) 1960-10-05 1960-10-05 Permeable plastic materials

Publications (1)

Publication Number Publication Date
GB943624A true GB943624A (en) 1963-12-04

Family

ID=10362629

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3420060A Expired GB943624A (en) 1960-10-05 1960-10-05 Permeable plastic materials

Country Status (1)

Country Link
GB (1) GB943624A (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3281511A (en) * 1964-05-15 1966-10-25 Gen Plastics Corp Method of preparing microporous tetrafluoroethylene resin sheets
FR2421190A1 (en) * 1978-03-31 1979-10-26 Hooker Chemicals Plastics Corp PROCESS FOR FORMING MICROPOROUS MEMBRANES
FR2559492A1 (en) * 1984-02-09 1985-08-16 Habia Cable Polymer foams and processes for obtaining them
EP0183022A2 (en) * 1984-10-11 1986-06-04 Daikin Industries, Limited Foamed articles of fluorocarbon resins
GB2193214A (en) * 1986-05-29 1988-02-03 Thomas Ronald Thomas Porous ptfe
EP0356045A2 (en) * 1988-08-05 1990-02-28 Hoechst Celanese Corporation Formation of halogenated polymeric microporous membranes having improved strength properties
US5081188A (en) * 1990-03-23 1992-01-14 E. I. Du Pont De Nemours And Company Processing additives for tetrafluoroethylene polymers
WO2013007233A1 (en) * 2011-07-14 2013-01-17 Geräte- und Pumpenbau GmbH Dr. Eugen Schmidt Gear ring pump

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3281511A (en) * 1964-05-15 1966-10-25 Gen Plastics Corp Method of preparing microporous tetrafluoroethylene resin sheets
FR2421190A1 (en) * 1978-03-31 1979-10-26 Hooker Chemicals Plastics Corp PROCESS FOR FORMING MICROPOROUS MEMBRANES
FR2559492A1 (en) * 1984-02-09 1985-08-16 Habia Cable Polymer foams and processes for obtaining them
EP0183022A2 (en) * 1984-10-11 1986-06-04 Daikin Industries, Limited Foamed articles of fluorocarbon resins
EP0183022A3 (en) * 1984-10-11 1986-12-17 Daikin Industries, Limited Foamed articles of fluorocarbon resins
GB2193214A (en) * 1986-05-29 1988-02-03 Thomas Ronald Thomas Porous ptfe
EP0356045A2 (en) * 1988-08-05 1990-02-28 Hoechst Celanese Corporation Formation of halogenated polymeric microporous membranes having improved strength properties
EP0356045A3 (en) * 1988-08-05 1991-01-23 Hoechst Celanese Corporation Formation of halogenated polymeric microporous membranes having improved strength properties
US5081188A (en) * 1990-03-23 1992-01-14 E. I. Du Pont De Nemours And Company Processing additives for tetrafluoroethylene polymers
WO2013007233A1 (en) * 2011-07-14 2013-01-17 Geräte- und Pumpenbau GmbH Dr. Eugen Schmidt Gear ring pump
US9309885B2 (en) 2011-07-14 2016-04-12 Nidec Gpm Gmbh Gear ring pump including housing containing port support therein with the port support formed of a material having a greater heat expansion coefficient than a material of the housing

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