Importance

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Abstract

A membrane comprising a layer (A) and a layer (B), where the layer (A) comprises a composition (i) containing the following polymer components, all percent amounts being by weight: a) 10-40% of a propylene homopolymer and/or or copolymer containing over 85% of propylene, and having a fraction insoluble in xylene at room temperature greater than 80%; and b) 60-90% of one or more α-olefin/ethylene copolymers containing less than 40% of ethylene and having solubility in xylene at room temperature greater than 70%; the amounts of (a) and (b) being referred to the total weight of (a) and (b); and the layer (B) comprises an ethylene homopolymer and/or copolymer having density from 0.915 to 0.980 cm³/g; said layer (B) being at least partially bonded to the layer (A).

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First Claim