Fluoropolymer barrier material

Details Fluoropolymer barrier material Fluoropolymer barrier material

C - Chemistry, Metallurgy

08

J

C08J 5/18 (2006.01) B32B 27/30 (2006.01)

Patent

CA 2563646

A novel densified fluoropolymer article is described which has a water vapor permeation of about 0.015 g-mm/m2/day or less, and preferably has a matrix tensile strength of at least 10,000 psi in two orthogonal directions. The articles are made by compressing expanded porous PTFE at pressures, temperatures and times which result in elimination of the pores, and subsequent stretching above the crystalline melt temperature.

L'invention concerne un nouvel article en fluoropolymère densifié qui a une perméativité à la vapeur d'eau d'environ 0,015 g-mm/m2/jour ou moins, et a de préférence une résistance à la traction de la matrice d'au moins 10,000 psi dans deux directions orthogonales. Les articles sont fabriqués d'abord par la compression du PTFE poreux expansé à dépression, avec des températures et des durées qui permettent l'élimination des pores, et ensuite par l'étirement au-dessus de la température de fusion cristalline.

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