Granular-type modified polytetrafluoroethylene dispersions...

C - Chemistry – Metallurgy – 08 – J

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C08J 9/24 (2006.01) B01D 39/08 (2006.01) B01D 39/16 (2006.01) B01D 67/00 (2006.01) B01D 71/36 (2006.01) C08J 3/03 (2006.01) C08L 27/18 (2006.01)

Patent

CA 2250455

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.

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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