Permeable polymer film

A film comprising at least one layer A) and at least one layer B), wherein the layer A) comprises a copolymer (i) of propylene with hexene-1 containing from 3 to 9% by weight, preferably from 5 to 9% by weight, more preferably from 6 to 9% by weight, in particular from 6.5 to 9% by weight, of recurring units derived from hexene-1, said copolymer having a melting temperature from 125° C. to 143° C., preferably from 128° C. to 143° C., and the layer B) comprises a polyolefin composition (ii) containing (all percentages being by weight):

• a) 10-40%, preferably 20-40%, more preferably 25-38%, of one or more propylene polymers selected from propylene homopolymers, copolymers of propylene with ethylene or a CH2═CHR α-olefin, where R is a C2—C8 alkyl radical, and copolymers of propylene with ethylene and said CH2═CHR α-olefin, said copolymers containing over 85% of propylene and having a fraction insoluble in xylene at room temperature greater than 80%;
• and
• b) 60-90%, preferably 60-80%, more preferably 62-75%, of one or more copolymers of ethylene with propylene or a CH2═CHR α-olefin, where R is a C2—C8 alkyl radical, or a combination thereof, and optionally minor quantities of a diene, said copolymers containing ethylene in a quantity from 20 to 80%, preferably from 20 to 40%, more preferably from 20 to 38%, and having solubility in xylene at room temperature greater than 70%, preferably greater than 80%;
• the amounts of (a) and (b) being referred to the total weight of (a) and (b).