| 摘要 |
Polyolefin composition comprising, in percent by weight: A) 10-50% of a copolymer of propylene with one or more comonomer(s) selected from ethylene and CH2=CHR alpha-olefins where R is a 2-8 carbon alkyl, which copolymer contains from 1 to 8% of comonomer(s); B) 50-90% of a blend of copolymers (b I) and (bII), wherein copolymer (bI) contains from 18 to 40% of ethylene, and copolymer (bII) contains from 55 to 85% of ethylene, and the weight ratio (bI)/(bII) is from 0.2 to 2; in which composition the copolymer component (b I) is present in amounts of 15% or more with respect to the total weight of (A) + (B), the weight ratio C2 II/C2 I of the content C2 II of ethylene in copolym er component (bII) to the content C2 I of ethylene in copolymer component (bI) is of 1.8 or more, and the intrinsic viscosity [.eta.] of the fraction XS solub le in xylene at room temperature (about 25 ~C), referred to the total weight of (A) + (B), is of 2 dl/g or more.
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