Patent ID: 8530582

Claim:
A modified polyolefin based on unfunctionalized polyolefins which contain not more than 30% by mass of ethylene, either 70-98% by mass or not more than 30% by mass of propylene either 75-95% by mass or not more than 25% by mass of 1-butene, or a combination thereof, where the sum of the proportions is 100% by mass, the triad distribution determined by 13 C NMR for propene triads having an atactic content of 20-34% by mass, a syndiotactic content of 5-19% by mass and an isotactic content of 48-75% by mass, and the triad distribution determined by 13 C NMR for 1-butene triads having an atactic content of 25-63% by mass, a syndiotactic content of 5-9% by mass and an isotactic content of 28-68% by mass, where the contents of isotactic, syndiotactic and atactic triads of propene and 1-butene each add up to 100%, the unfunctionalized polymers having been prepared in the presence of a metallocene catalyst, and monomers having one or more functional groups having been grafted onto the unfunctionalized polyolefins.