Patent ID: 8257543

Claim:
Process for the production of a layered composite structure comprising (1) a semi-permeable membrane made of a polymer composition comprising a polyetherester elastomer and (2) at least one web layer bonded to the membrane, wherein the process comprises applying a melt layer of the polymer composition onto the at least one web layer, wherein the polyetherester elastomer consists of: polyether soft segments formed from poly(alkylene-ether)glycols, wherein at least 50 wt. %, relative to the weight of the poly(alkylene-ether) glycols, of alkylene-ether segments are formed from ethylene oxide, and polyester hard segments consisting of ester units derivable from short chain diols and dicarboxylic acid consisting of 98-65 mole % terephthalic acid (TPA), 2-35 mole % isophthalic acid (IPA) and optionally 0-20 mole % other dicarboxylic acids, wherein the mole % is relative to the total molar amount of dicarboxylic acid.