Abstract:
Films especially suitable for the packaging of fresh foodstuff, like salad and vegetables, due to their valuable balance of high permeability to oxygen and optimal permeability to water vapour, comprising at least one layer A) and at least one layer B), wherein the layer A) comprises a copolymer of propylene with hexene-1 containing from 3 to 9% by weight of recurring units derived from hexene-1, said copolymer having a melting temperature from 125° C. to 143° C., and the layer B) comprises a polyolefin composition containing (all percentages being by weight): a) 10-40% of one or more propylene homopolymers or copolymers 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 copolymers of ethylene with alpha-olefin(s), containing ethylene in a quantity from 20 to 80%, and having solubility in xylene at room temperature greater than 70%.
Abstract:
A multilayer film is characterized by having at least a skin layer comprising a propylene -- ethylene copolymers characterized by the following features: ethylene derived units content of between 1.0 wt% and 15.0% wt%; molecular weight distribution (MWD), expressed in terms of Mw/Mn, greater than 4.0; - the content of xylene soluble fraction (XS) and the ethylene derived units content (C2) fulfill the following relation: XS 0.435C2 where XS is the percentage by weight of the fraction soluble in xylene at 25°C and C2 is the percentage by weight of ethylene units in the said copolymers determined via NMR.
Abstract:
Polyolefin compositions comprising, all percentages being by weight: A) from 70 to 95%, of a compositions comprising (by weight): A I ) 15-80% of one or more copolymers of propylene; A II ) 20-85% of one or more copolymers with different comonomer(s) content than in A) B) from 5 to 30% of an elastomeric or plastomeric polyolefin or polyolefin composition.