Patent ID: 8921489

Claim:
A modified polyolefin, obtained by functionalization of a unfunctionalized polyolefin consisting of polymerized units of ethylene, propylene and 1-butene, and having a weight average molecular weight of at least 20,000 g/mol which is obtained by polymerizing a monomer composition, comprising consisting of: ethylene in a proportion of not more than 20% by mass; propylene in a proportion of either 50-98% by mass or not more than 20% by mass; and 1-butene in a proportion of 75-96% by mass or not more than 25% by mass; wherein % by mass is based on the total mass of monomers in the unfunctionalized polyolefin, a triad distribution for the propylene in the unfunctionalized polyolefin comprises: 75-98% by mass of an isotactic triad, not more than 20% by mass of a syndiotactic triad, and not more than 20% by mass of an atactic triad, a triad distribution for the 1-butene in the unfunctionalized polyolefin comprises: 10-98% by mass of an isotactic triad, 1-90% by mass of an atactic triad, and not more than 25% by mass of a syndiotactic triad, the triad content is determined by 13 C NMR, the sum of isotactic, syndiotactic and atactic triads of propene and 1-butene each add up to 100%, the unfunctionalized polyolefin is obtained by polymerization with a metallocene catalyst, and functionalizing the unfunctionalized polyolefin comprises grafting one or more monomers having one or more functional groups onto the unfunctionalized polyolefin.