Abstract: A hydrophilic porous polymer film is disclosed that is particularly well-suited for use in an electrolysis cell producing hydrogen. The porous polymer film contains one or more high-density polyethylene polymers in combination with one or more hydrophilic additives. The porous film can be formed through a gel extrusion process or through sintering. Extremely thin films can be produced that have desired permeability characteristics, hydrophilicity characteristics, and mechanical characteristics necessary for use in the cell.

Abstract: A machine direction oriented film comprising a multimodal copolymer of ethylene and at least two alpha-olefin-comonomers having: a) a density of from 906 to 925 kg/m3 determined according to ISO 1183, b) an MFR21 of 10-200 g/10 min determined according to ISO1133, wherein the multimodal copolymer of ethylene comprises c) a first copolymer of ethylene and a first alpha-olefin comonomer having 4 to 10 carbon atoms; and d) a second copolymer of ethylene having an alpha-olefin comonomer different from the first copolymer, said second alpha-olefin comonomer having 6 to 10 carbon atoms.

Abstract: A machine direction oriented film comprising a multimodal copolymer of ethylene and at least two alpha-olefin-comonomers having: a) a density of from 906 to 925 kg/m3 determined according to ISO 1183, b) an MFR21 of 10-200 g/10 min determined according to ISO1133, wherein the multimodal copolymer of ethylene comprises c) a first copolymer of ethylene and a first alpha-olefin comonomer having 4 to 10 carbon atoms; and d) a second copolymer of ethylene having an alpha-olefin comonomer different from the first copolymer, said second alpha-olefin comonomer having 6 to 10 carbon atoms.