Patent ID: 7148289

Claim:
A polypropylene composition having a sealing initiation temperature below 80° C., and containing less than 1% by weight of monomeric units derived from ethylene with respect to the total weight of the composition consisting essentially of: from 35 to 58% by weight of a random copolymer of propylene (copolymer (A)) containing from 9 to 30% by weight of monomeric units derived from 1-butene and from 0 to 0.5% by weight of monomeric units derived from ethylene with respect to the total weight of copolymer (A), and from 65 to 42% by weight of a random copolymer of propylene (copolymer (B)) containing 35 to 55% by weight of monomeric units derived from 1-butene and from 0 to 0.5% by weight of monomeric units derived from ethylene with respect to the total weight of copolymer (B).