| 摘要 |
Described is a porous flexible sheet of about 96.5 to 99.5 weight percent amorphous precipitated silica and from about 0.5 to about 3.5 weight percent fibrillated, unsintered polymer, e.g., polytetrafluoroethylene. The sheet is useful as a separator in absorbed electrolyte gas recombinant batteries, e.g., lead-acid batteries. The sheet is prepared by subjecting a dry mixture of the silica and polymeric material, e.g., polytetrafluoroethylene, in the above proportions to mechanical shear blending forces to fibrillate the polymer and thereafter dry forming the resulting admixture into sheet form. |
