MELANGES MOUILLABLES PAR L'EAU CONTENANT DU POLYTETRAFLUORO-ETHYLENE ETSEPARATEURS POREUX POUR CELLULES ELECTROCHIMIQUES FORMES A PARTIR DE CES MELANGES

摘要

1325251 Porous P.T.F.E. blends E I DU PONT DE NEMOURS & CO 26 May 1971 [15 June 1970] 17284/71 Headings C3C and C3P [Also in Division H1] A blend of polytetrafluoroethylene with from 20 to 95% by weight, based on the total weight of the blend, of an inorganic particulate solid having an average particle diameter of no greater than 0À2 micron, a specific surface area of at least 20 m.2/gm. and a bulk density of no greater than 0À25 gm./cm.3. In the examples mixtures of ethanol, water, polytetrafluoroethylene dispersion and fumed SiO 2 , TiO 2 or Al 2 O 3 are blended, coagulated, filtered, dried, wetted with lubricant and rolled with repeated folding and turning 90 degrees to give porous sheeting which may be used as a separator in a fuel-cell.