Composite sheet and production method thereof

Details Composite sheet and production method thereof Composite sheet and production method thereof

C - Chemistry, Metallurgy

08

J

C08J 9/40 (2006.01)

Patent

CA 2748197

It is an objective of the present invention to provide a composite sheet and a production method thereof, which composite sheet has excellent sealing ability, since the sheet exhibits high compressibility and yet low stress relaxation, as well as high strength and excellent pressure resistance. The objective of the present invention is also to provide a sheet gasket having the above-mentioned properties. The composite sheet according to present invention is characterized in that pores of an expanded porous PTFE sheet are filled with silica gel; and a ratio of remaining pores is not less than 5% and not more than 50%.

L'invention porte sur une feuille composite qui présente une faible vitesse de relaxation des contraintes et un taux de compression élevé, ainsi qu'une excellente aptitude à l'étanchéité, une résistance élevée et une excellente durabilité. L'invention porte en outre sur un procédé de fabrication de cette feuille composite. L'invention porte de plus sur un joint plat ayant les caractéristiques susmentionnées. Cette feuille composite est caractérisée en ce que les trous d'air dans une feuille de PTFE poreuse étirée sont remplis d'un gel de silice, ladite feuille ayant une porosité entre 5 et 50 %.

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