GB2319027A - Granular-type modified polytetrafluoroethylene dispersions and fused articles prepared therefrom - Google Patents

Granular-type modified polytetrafluoroethylene dispersions and fused articles prepared therefrom

Info

Publication number
GB2319027A
GB2319027A GB9710003A GB9710003A GB2319027A GB 2319027 A GB2319027 A GB 2319027A GB 9710003 A GB9710003 A GB 9710003A GB 9710003 A GB9710003 A GB 9710003A GB 2319027 A GB2319027 A GB 2319027A
Authority
GB
United Kingdom
Prior art keywords
granular
fused
prepared therefrom
articles prepared
type modified
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.)
Granted
Application number
GB9710003A
Other versions
GB9710003D0 (en
GB2319027B (en
Inventor
Norman Ernest Clough
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.)
WL Gore and Associates UK Ltd
WL Gore and Associates Inc
Original Assignee
WL Gore and Associates UK Ltd
WL Gore and Associates Inc
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
Priority claimed from GBGB9606824.2A external-priority patent/GB9606824D0/en
Application filed by WL Gore and Associates UK Ltd, WL Gore and Associates Inc filed Critical WL Gore and Associates UK Ltd
Priority to GB9710003A priority Critical patent/GB2319027B/en
Publication of GB9710003D0 publication Critical patent/GB9710003D0/en
Publication of GB2319027A publication Critical patent/GB2319027A/en
Application granted granted Critical
Publication of GB2319027B publication Critical patent/GB2319027B/en
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • C08J3/00—Processes of treating or compounding macromolecular substances
    • C08J3/02—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques
    • C08J3/03—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in aqueous media
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/14—Other self-supporting filtering material ; Other filtering material
    • B01D39/16—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres
    • B01D39/1638—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being particulate
    • B01D39/1653—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being particulate of synthetic origin
    • B01D39/1661—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being particulate of synthetic origin sintered or bonded
    • 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
    • B01D67/0004—Organic membrane manufacture by agglomeration of particles
    • B01D67/00041—Organic membrane manufacture by agglomeration of particles by sintering
    • 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
    • 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
    • C08J9/24—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof by surface fusion and bonding of particles to form voids, e.g. sintering
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/04—Additives and treatments of the filtering material
    • B01D2239/0471—Surface coating material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/06—Filter cloth, e.g. knitted, woven non-woven; self-supported material
    • B01D2239/065—More than one layer present in the filtering material
    • B01D2239/0654—Support layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2323/00—Details relating to membrane preparation
    • B01D2323/08—Specific temperatures applied
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2323/00—Details relating to membrane preparation
    • B01D2323/12—Specific ratios of components used
    • 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)
  • Polymers & Plastics (AREA)
  • Manufacturing & Machinery (AREA)
  • Thermal Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Organic Chemistry (AREA)
  • Dispersion Chemistry (AREA)
  • Materials Engineering (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
  • Manufacture Of Macromolecular Shaped Articles (AREA)
  • Processes Of Treating Macromolecular Substances (AREA)

Abstract

An aqueous dispersion of modified granular PTFE particles is sprayed or cast to form a sheet. The sheet is then dried and the modified granular particles fused together to form an open network of fused interconnected particles that define a tortuous network of voids through the sheet. It has been found that when the modified granular-type PTFE aqueous dispersions are employed, the resulting fused sheets are stronger than when the usual unmodified PTFE homopolymer of the granular-type is used.
GB9710003A 1996-03-30 1997-04-01 Granular-type modified polytetrafluoroethylene dispersions and fused articles prepared therefrom Expired - Fee Related GB2319027B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9710003A GB2319027B (en) 1996-03-30 1997-04-01 Granular-type modified polytetrafluoroethylene dispersions and fused articles prepared therefrom

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GBGB9606824.2A GB9606824D0 (en) 1996-03-30 1996-03-30 Granular-type modified polytetrafluoroethlyene dispersions and fused articles prepared therefrom
PCT/GB1997/000920 WO1997036953A1 (en) 1996-03-30 1997-04-01 Granular-type modified polytetrafluoroethylene dispersions and fused articles prepared therefrom
GB9710003A GB2319027B (en) 1996-03-30 1997-04-01 Granular-type modified polytetrafluoroethylene dispersions and fused articles prepared therefrom

Publications (3)

Publication Number Publication Date
GB9710003D0 GB9710003D0 (en) 1997-07-09
GB2319027A true GB2319027A (en) 1998-05-13
GB2319027B GB2319027B (en) 2000-03-15

Family

ID=26309039

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9710003A Expired - Fee Related GB2319027B (en) 1996-03-30 1997-04-01 Granular-type modified polytetrafluoroethylene dispersions and fused articles prepared therefrom

Country Status (1)

Country Link
GB (1) GB2319027B (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0369466A2 (en) * 1988-11-18 1990-05-23 Daikin Industries, Limited Preparation of a porous film of polytetrafluoroethylene
EP0450894A1 (en) * 1990-03-31 1991-10-09 W.L. GORE & ASSOCIATES (UK) LTD Porous PTFE structures

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3331822A (en) * 1963-08-20 1967-07-18 Thiokol Chemical Corp Production of polytetrafluoroethylene molding powders by the aqueous suspension polymerization of tetrafluoroethylene with small amounts of perfluoroolefins containing from 3 to 4 carbon atoms
JPS5125398B1 (en) * 1966-05-25 1976-07-30

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0369466A2 (en) * 1988-11-18 1990-05-23 Daikin Industries, Limited Preparation of a porous film of polytetrafluoroethylene
EP0450894A1 (en) * 1990-03-31 1991-10-09 W.L. GORE & ASSOCIATES (UK) LTD Porous PTFE structures

Also Published As

Publication number Publication date
GB9710003D0 (en) 1997-07-09
GB2319027B (en) 2000-03-15

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Legal Events

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

Effective date: 20010401