Core-shell fluoropolymer dispersions

C - Chemistry – Metallurgy – 08 – F

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C08F 259/08 (2006.01) C08L 51/00 (2006.01) C09D 151/00 (2006.01)

Patent

CA 2472135

A dispersion of non-melt-processible fluoropolymer particles having an SSG of less than about 2.225 in aqueous medium. The fluoropolymer particles comprise a core of high molecular weight polytetrafluoroethylene having an average melt creep viscosity greater than about 1.5 x 1010 Pa.bullet.s and a shell of lower molecular weight polytetrafluoroethylene or modified polytetrafluoroethylene. The shell has an average melt creep viscosity greater than about 9 x 109 Pa.bullet.s and comprises about 5 to about 30% by weight of the particles. The fluoropolymer in the dispersion of the invention is fibrillating.

La présente invention concerne une dispersion de particules de fluoropolymères transformables à l'état non fondu, qui possède une densité standard inférieure à environ 2,225 dans un milieu aqueux. Les particules de fluoropolymères de l'invention comprennent un coeur de polytétrafluoroéthylène de poids moléculaire élevé possédant une viscosité dynamique moyenne à l'état fondu supérieure à environ 1,5 x 10?10¿ Pa.s, et une coque de polytétrafluoroéthylène ou de polytétrafluoroéthylène modifié de poids moléculaire inférieur. La coque possède une viscosité dynamique moyenne à l'état fondu supérieure à environ 9 x 10?9¿ Pa.s, et comprend entre environ 5 et environ 30% en poids des particules. Le fluoropolymère dans la dispersion de l'invention est un fluoropolymère en fibrillation.

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