Patent ID: 7288598

Claim:
A masterbatch composition comprising (percentage by weight): 1) 10-50% of a crystalline propylene homopolymer; 2) 50-90% of a blend consisting of: a) a copolymer (a) of ethylene and 10-40% of at least one C 4 -C 10 α-olefin of formula H 2 C═CHR, where R is a C 2 -C 8 linear or branched alkyl radical; and b) an amorphous copolymer (b) of propylene and ethylene, wherein an ethylene content is from 20-70%, and having an intrinsic viscosity value of a xylene-soluble moiety of from 2.2 to 3.5 dL/g, this value being equal to 0.8 to 1.2 times the intrinsic viscosity value of a xylene-soluble moiety of copolymer (a); wherein a weight ratio between copolymer (a) and copolymer (b) is from 3/1 to 1/3, and the masterbatch composition comprises a flexural modulus equal to or lower than 700 MPa.