GB853030A - Method of forming a uniformly, or substantially uniformly, porous body of p.t.f.e. - Google Patents

Method of forming a uniformly, or substantially uniformly, porous body of p.t.f.e.

Info

Publication number
GB853030A
GB853030A GB1523157A GB1523157A GB853030A GB 853030 A GB853030 A GB 853030A GB 1523157 A GB1523157 A GB 1523157A GB 1523157 A GB1523157 A GB 1523157A GB 853030 A GB853030 A GB 853030A
Authority
GB
United Kingdom
Prior art keywords
bronze
phase
porous
interstices
formed phase
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
GB1523157A
Inventor
Victor Thomson Morgan
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.)
BOUND BROOK BEARINGS Ltd
Original Assignee
BOUND BROOK BEARINGS 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 BOUND BROOK BEARINGS Ltd filed Critical BOUND BROOK BEARINGS Ltd
Priority to GB1523157A priority Critical patent/GB853030A/en
Publication of GB853030A publication Critical patent/GB853030A/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)
  • Powder Metallurgy (AREA)

Abstract

Porous polytetrafluoroethylene is formed by introducing P.T.F.E. into the interstices of a uniformly porous pre-formed phase, sintering, e.g. at 327 DEG C. to 400 DEG C., to consolidate the P.T.F.E. and then removing the pre-formed phase. For example a porous P.T.F.E. body having intercommunicating spherical pores is produced by utilizing a pre-formed phase of coalesced spherical particles of bronze which are subsequently dissolved out with acid. Alternatively the porous body may itself comprise coalesced spheres in which case a pre-phase of similar construction, e.g. of bronze, starch, salt or plastic, has its interstices filled with a suitable material, e.g. polystyrene, polyethylene, polyvinyl chloride, epoxy resins and cellulose derivatives, to form the pre-formed phase, the interstices of which, after removal of the pre-phase, e.g. by dissolution, are filled with P.T.F.E., and the pre-formed phase, after consolidation of the P.T.F.E., is then removed by a solvent inert to the P.T.F.E. Preferably not more than 90% of the spherical particles of bronze, plastic &c., should vary in size by more than a factor of 2 and other metals and metal alloys, e.g. copper, iron, or cupro-nickel, may be used instead of bronze.ALSO:Porous polytetrafluoroethylene (P.T.F.E.) is formed by introducing P.T.F.E. into the interstices of a uniformly porous pre-formed phase, sintering, e.g. at 327 DEG C. to 400 DEG C., to consolidate the P.T.F.E. an then removing the pre-formed phase. For example a porous P.T.F.E. body having intercommunicating spherical pores is produced by utilizing a pre-formed phase of coalesced spherical particles of bronze which are subsequently dissolved out with acid. Alternatively the porous body may itself comprise coalesced spheres in which case a pre-phase of similar construction, e.g. of bronze, starch, salt or plastic, has its interstices filled with a suitable material, e.g. polystyrene, polyethylene, polyvinyl chloride, epoxy resins and cellulose derivatives to form the pre-formed phase, the interstices of which, after removal of the prephase, e.g. by dissolution, are filled with P.T.F.E., and the pre-formed phase, after consolidation of the P.T.F.E., is then removed with a solvent inert to the P.T.F.E. Preferably not more than 10% of the spherical particles of bronze, plastic &c., should vary in size by more than a factor of 2 and other metals and alloys, e.g. copper, iron and cupro-nickel, may be used instead of bronze.
GB1523157A 1957-05-14 1957-05-14 Method of forming a uniformly, or substantially uniformly, porous body of p.t.f.e. Expired GB853030A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1523157A GB853030A (en) 1957-05-14 1957-05-14 Method of forming a uniformly, or substantially uniformly, porous body of p.t.f.e.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1523157A GB853030A (en) 1957-05-14 1957-05-14 Method of forming a uniformly, or substantially uniformly, porous body of p.t.f.e.

Publications (1)

Publication Number Publication Date
GB853030A true GB853030A (en) 1960-11-02

Family

ID=10055379

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1523157A Expired GB853030A (en) 1957-05-14 1957-05-14 Method of forming a uniformly, or substantially uniformly, porous body of p.t.f.e.

Country Status (1)

Country Link
GB (1) GB853030A (en)

Cited By (2)

* 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
WO2000021905A1 (en) * 1998-10-13 2000-04-20 Alliedsignal Inc. Three dimensionally periodic structural assemblies on nanometer and longer scales

Cited By (4)

* 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
WO2000021905A1 (en) * 1998-10-13 2000-04-20 Alliedsignal Inc. Three dimensionally periodic structural assemblies on nanometer and longer scales
US6261469B1 (en) 1998-10-13 2001-07-17 Honeywell International Inc. Three dimensionally periodic structural assemblies on nanometer and longer scales
US6517763B1 (en) 1998-10-13 2003-02-11 Alliedsignal, Inc. Three dimensionally periodic structural assemblies in nanometer and longer scales

Similar Documents

Publication Publication Date Title
ES321809A1 (en) Procedure for the separation of components of batteries of accumulators out of use. (Machine-translation by Google Translate, not legally binding)
GB8521635D0 (en) Amorphous metallic article
GB853030A (en) Method of forming a uniformly, or substantially uniformly, porous body of p.t.f.e.
ZA792896B (en) Method for the production of iodophor powders
GB1195164A (en) A Method of Separating Metal and Plastics Material.
KR830004443A (en) Fabrication of High Strength Metal Articles
JPS51124616A (en) Activation method of hydrogen storage material
JPS51131410A (en) Method for adding low-boiling metal to molten metal
ES287883A1 (en) Procedure and apparatus for the obtaining of metallic uranium or an alloy thereof (Machine-translation by Google Translate, not legally binding)
JPS532381A (en) Making harmless method for incinerated ash containing heavy metals
ES239635A1 (en) Method of leaching ores
JPS5654013A (en) Metallic magnetic powder and treatment thereof
Leger Hydrogen Content of Ferro-Alloys in the Steel Foundry
JPS558477A (en) Production of porous body of aluminum or its alloy
JPS5319129A (en) Metal material for hydrogen storage
JPS6418901A (en) Gel for oxide superconductor and production thereof
JPS5245385A (en) Process for production of tube bundle
SU498368A1 (en) Electrolytic magnesium production method
JPS5213275A (en) Method and apparatus for securing at predetermined posture a workpiece of an optional shape
JPS5460359A (en) Production on thermosetting resin particles
JPS51114756A (en) Method of manufacturing a heat-storing metal body for use in a heat ex changer
JPS51128612A (en) A method of inducing shape memorizing effect of metal materials
JPS5510521A (en) Anion selective electrode
Rabinovich et al. The Effect of Treatment Temperature on the Structure and Magnetic Properties of the\ Permanent Magnet\ Alloys YuNDK 35 T 5 AA and YuNDK 40 T 8 AA
GB954288A (en) Improvements in and relating to copper-beryllium alloys