| http://www.w3.org/ns/prov#value | - Reverting to the graft polymer previously mentioned and constituting the membrane or a film such as 2 incorporated into this membrane it should be pointed out here that this graft polymer may be obtained through incorporation of the copolymer of ethylene and vinyl alcohol into the polyurethane during or at the end of the step of polymerization of the polyurethane.
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