Patent ID: 6437047
Filing Date: 2002-08-20
Classification: C08L,Y10T

Abstract:
Polyethylene composition comprising (percentages by weight):A) from 60 to 95% of a copolymer of ethylene with an alpha-olefin CH2&boxH;CHR, wherein R is an alkyl radical containing from 1 to 18 atoms of carbon, the said copolymer having a density from 0.905 to 0.935 g/cm3, Mw/Mn values less than 4, and F/E ratio values greater than 20; said copolymer being obtained by using catalysts comprising a compound of a transition element, wherein this element is bound to at least one cyclopentadienyl group, and a cocatalyst; B) from 5 to 40% of one or more crystalline copolymers of propylene selected from among (4) copolymers of propylene with ethylene containing from 3 to 8% of ethylene; (ii) copolymers of propylene with one or more alpha-olefins CH2&boxH;CHRIr, where RI is an alkyl radical having from 2 to 8 carbon atoms or an aryl radical, containing from 6 to 25% of alpha-olefins CH2&boxH;CHRI; (iii) copolymers of propylene with ethylene and one or more alpha-olefins CH2&boxH;CHRI, where RI has the aforesaid meaning, containing from 0.1 to 8% of ethylene and from 0.1 to 20% of alpha-olefins CH2&boxH;CHRI, on condition that the total content of ethylene and alpha-olefins CH2&boxH;CHRI in the copolymers (iii) is greater than or equal to 5%.