abstract |
The present invention relates to a high-strength porousnfilm or sheet consisting essentially of a high-molecular-weightnpolyethylene resin having a viscosity-average molecular weightnof not less than 300,000, wherein the said film has a thicknessnof 5 to 50 µm, an air permeability of 200 to 1,000 sec/100 cc, anporosity of 10 to 50% and a pin puncture strength of not lessnthan 600 gf/25 µm, and a process for producing the said film. |