Patent ID: 6689436
Filing Date: 2004-02-10
Classification: C08J,C08L,Y10S,Y10T

Abstract:
A heat-shrinkable film prepared by stretching an unoriented primary film by a factor of 6 in two directions perpendicular to each other to reach a final thickness of 15 micrometers, said film being made from a non-crosslinked polyolefin composition consisting essentially of:(i) 85% by weight of a copolymer of ethylene with one or more &agr;-olefins selected from the group consisting of 1-butene, 1-hexene and mixtures thereof, and (ii) 15% by weight of a copolymer of propylene with ethylene and one or more &agr;-olefin selected from 1-butene, 1-hexene, and mixtures thereof, wherein said copolymer (i): contains up to 20% by mole of &agr;-olefin, is prepared in the presence of a Ziegler-Natta catalyst obtained from an organometallic compound of a metal in Groups II and III of the Periodic System with a solid catalytic component comprising a titanium compound containing at least a titanium-halogen bond and supported on a magnesium halide in active form, and has a density between 0.88 and 0.945 g/cm; and wherein said copolymer (ii) contains from 80 to 98% by weight of units derived from propylene, from 1 to 10% by weight of units derived from ethylene, from 1 to 10% by weight of units derived from &agr;-olefins, and has a xylene-insoluble fraction, at 25Â° C., greater than 70%.