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A process for producing porous films which comprises melting a resin composition consisting essentially of (1) 100 parts by weight of a high-pressure-processed low-density polyethylene resin having a melt index of 0.5 to 7 and a density of 0.915 to 0.935, a linear low-density polyethylene resin havi

A process for producing porous films which comprises melting a resin composition consisting essentially of (1) 100 parts by weight of a high-pressure-processed low-density polyethylene resin having a melt index of 0.5 to 7 and a density of 0.915 to 0.935, a linear low-density polyethylene resin having a melt index of 0.5 to 8.5 and a density of 0.915 to 0.935, or a mixture thereof and (2) 50 to 500 parts by weight of barium sulfate having an average particle diameter of 0.1 to 7 m

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In a process for producing porous films which comprises melting a resin composition consisting essentially of a polyethylene resin and a filler noncompatiable therewith, and with or without a hydrocarbon-free lubricant, forming the molten resin composition into a film and then stretching the film at

In a process for producing porous films which comprises melting a resin composition consisting essentially of a polyethylene resin and a filler noncompatiable therewith, and with or without a hydrocarbon-free lubricant, forming the molten resin composition into a film and then stretching the film at least uniaxially, the improvement in which the polyethylene resin is either a high-pressure-processed low-density polyethylene resin having a melt index of 0.5 to 7 and a density of 0.915 to 0.935, a linear low-density polyethylene resin having a melt index of 0.5 to 8.5 and a density of 0.915 to 0.935, or a mixture thereof; the filler is barium sulfate having an average particle diameter of 0.1 to 7m50 to 500 parts by weight per 100 parts by weight of the polyethylene resin; and the film is stretched by a factor of 1.5 to 7. A porous film having water resistance, moisture permeability and gas permeability which has been produced by a process as claimed in any one of claims 1 and 2 to 8. The porous film, according to claim 9, wherein said film is a fluid-impereable sheet for diapers or sanitary napkins.