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1. WO1997036953 - GRANULAR-TYPE MODIFIED POLYTETRAFLUOROETHYLENE DISPERSIONS AND FUSED ARTICLES PREPARED THEREFROM

Publication Number WO/1997/036953
Publication Date 09.10.1997
International Application No. PCT/GB1997/000920
International Filing Date 01.04.1997
Chapter 2 Demand Filed 10.10.1997
IPC
B01D 39/08 2006.01
BPERFORMING OPERATIONS; TRANSPORTING
01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
DSEPARATION
39Filtering material for liquid or gaseous fluids
08Filter cloth, i.e. woven, knitted or interlaced material
B01D 39/16 2006.01
BPERFORMING OPERATIONS; TRANSPORTING
01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
DSEPARATION
39Filtering material for liquid or gaseous fluids
14Other self-supporting filtering material
16of organic material, e.g. synthetic fibres
B01D 67/00 2006.01
BPERFORMING OPERATIONS; TRANSPORTING
01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
DSEPARATION
67Processes specially adapted for manufacturing semi-permeable membranes for separation processes or apparatus
B01D 71/36 2006.01
BPERFORMING OPERATIONS; TRANSPORTING
01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
DSEPARATION
71Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
06Organic material
30Polyalkenyl halides
32containing fluorine atoms
36Polytetrafluoroethene
C08J 3/03 2006.01
CCHEMISTRY; METALLURGY
08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
JWORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H142
3Processes of treating or compounding macromolecular substances
02Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques
03in aqueous media
C08J 9/24 2006.01
CCHEMISTRY; METALLURGY
08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
JWORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H142
9Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
24by surface fusion and bonding of particles to form voids, e.g. sintering
CPC
B01D 2239/04
BPERFORMING OPERATIONS; TRANSPORTING
01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
DSEPARATION
2239Aspects relating to filtering material for liquid or gaseous fluids
04Additives and treatments of the filtering material
B01D 2239/0471
BPERFORMING OPERATIONS; TRANSPORTING
01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
DSEPARATION
2239Aspects relating to filtering material for liquid or gaseous fluids
04Additives and treatments of the filtering material
0471Surface coating material
B01D 2239/0654
BPERFORMING OPERATIONS; TRANSPORTING
01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
DSEPARATION
2239Aspects relating to filtering material for liquid or gaseous fluids
06Filter cloth, e.g. knitted, woven non-woven; self-supported material
065More than one layer present in the filtering material
0654Support layers
B01D 2239/1241
BPERFORMING OPERATIONS; TRANSPORTING
01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
DSEPARATION
2239Aspects relating to filtering material for liquid or gaseous fluids
12Special parameters characterising the filtering material
1241Particle diameter
B01D 2239/1291
BPERFORMING OPERATIONS; TRANSPORTING
01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
DSEPARATION
2239Aspects relating to filtering material for liquid or gaseous fluids
12Special parameters characterising the filtering material
1291Other parameters
B01D 2323/12
BPERFORMING OPERATIONS; TRANSPORTING
01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
DSEPARATION
2323Details relating to membrane preparation
12Specific ratios of components used
Applicants
  • W.L. GORE & ASSOCIATES (UK) LTD. [GB]/[GB] (AllExceptUS)
  • CLOUGH, Norman, Ernest [GB]/[GB] (UsOnly)
Inventors
  • CLOUGH, Norman, Ernest
Agents
  • McCALLUM, William, Potter
Priority Data
9606824.230.03.1996GB
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) GRANULAR-TYPE MODIFIED POLYTETRAFLUOROETHYLENE DISPERSIONS AND FUSED ARTICLES PREPARED THEREFROM
(FR) DISPERSIONS DE POLYTETRAFLUOROETHYLENE MODIFIE DE TYPE GRANULAIRE ET ARTICLES FONDUS PREPARES A PARTIR DE CELLES-CI
Abstract
(EN)
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.
(FR)
Une dispersion aqueuse de particules modifiées de PTFE granulaire est pulvérisée ou coulée pour former une feuille. Cette feuille est ensuite séchée et les particules granulaires modifiées sont réunies par fusion pour former un réseau ouvert de particules fondues interconnectées définissant un réseau tortueux de vides dans la feuille. Il a été démontré qu'avec l'emploi de dispersions aqueuses en PTFE de type granulaire modifié les feuilles fondues obtenues sont plus résistantes qu'avec l'homopolymère PTFE de type granulaire non modifié.
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