TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The electron beam reactive group comprises methacrylates, acrylates, acrylamides, vinyl ketones, styrene, vinyl ethers, vinyl- or allyl-containing reagents, benzyl radicals and tertiary-carbon based materials.    TECHNOLOGY FOCUS - POLYMERS - Preferred Process: The process further comprises: applying water on the coated porous base membrane and wetting the coated porous base membrane prior to the exposition with the high energy source; drying the porous base membrane after applying the coating of hydrophilic polymer and before applying water on it, and wetting of the coated porous base membrane; and autoclave treatment of the coated porous base membrane after the irradiation, where a flow rate does not change by the coated porous membrane with every additional autoclave processes. The application of the coating of the hydrophilic polymer comprises dissolving the hydrophilic polymers in a solvent or a solvent mixture and wetting the porous base membrane. The irradiation of the coated porous base membrane produces a radical with high energy source on the porous base membrane and with an electron beam reactive groups. The irradiation of the coated porous base membrane with the high energy source comprises exposing the coated porous base membrane to an electron beam at a dosage rate of 0.1-2000 kGy. The irradiation of the coated porous base membrane with the high energy source contains an additive process. The irradiation of the coated porous base membrane with the high energy source takes place on one or both side of the coated porous base membrane. The autoclave treatment comprises a vapor sterilization process. The autoclave treatment comprises heating the coated porous base membrane at greater than 100 degrees C and at an increased pressure relative to an ambient pressure. The drying step of the coated porous membrane comprises heating the coated porous membrane at less than 150 degrees C. Preferred Components: The hydrophilic polymer comprises polyvinyl alcohol (preferred), polyvinyl alcohol-polyvinyl amine copolymer, polyacrylic acid, polyacrylates, polyethylene glycol, polyethylene amine, polyvinyl amine and/or their derivatives. The porous base membrane is expanded polytetrafluoroethylene. The coating step comprises a coating solution concentration of 0.1-20 wt.%. The coating of the hydrophilic polymer exhibits an average thickness of 1 nm to 1 mu m. The coated porous base membrane after the irradiation has a flow rate of water of greater than 1 ml/minute-cm2 at differential pressure of 27 inches Hg after 10 wet/dry cycles at room temperature or at 100 degrees C. The coated porous base membrane after the irradiation exhibits an average pore size of 10 nm to 50 mu m, as measured by bubble point measurements. The coated porous membrane exhibits a weight percent add-on and/or burn-off weight percent of the hydrophilic coating of 3-15 wt.%. EXAMPLE - No suitable example given.