Compositions of ethylene polymers for the manufacture of films

Claim 1

A composition comprising (a) from 25 to 95 weight percent of at least one free-radical ethylene polymer having a melt index between 0.15 and 2 dg/min, the free radical ethylene polymer being obtained by polymerization under high pressure and high temperature conditions and (b) from 5 to 75 weight percent of at least one ethylene α-olefin copolymer, wherein said α-olefin contains at least 4 carbon atoms, wherein said copolymer has a specific gravity between 0.905 and 0.940 and an average proportion of α-olefin units between 1 and 8 mole percent, said copolymer comprising both crystalline fractions and amorphous fractions and having a melt index between 0.4 and 3 dg/min, wherein said crystalline fractions of said copolymer have a single melting peak between 118° and 130° C. and represent from 20 to 50 weight percent of the total copolymer, the copolymer having a polydispersity index of between about 3 and about 9 for binary polymers and between about 4 and about 12 for ternary polymers; wherein the distribution of α-olefin units in the copolymer is heterogeneous, and wherein the proportion of α-olefin units in the copolymer varies between at least 0.2 and at most 5 times the average proportion of α-olefin units in the various fractions.