Polymer composition having improved wet ageing properties

A crosslinkable polymer composition, comprising

• (i) an unsaturated polyolefin prepared by radical polymerization having a total amount of carbon-carbon double bonds/1000 carbon atoms of more than 0.37 based upon ASTM D3124-72, wherein the base line is drawn from 980 cm−1 to around 840 cm−1 and the peak heights are determined at around 888 cm−1 for vinylidene, around 910 cm−1 for vinyl and around 965 cm−1 for trans-vinylene, and an amount of units derived from polar comonomer of less than 150 micromoles per gram of unsaturated polyolefin;
• and
• (ii) a polar copolymer having an amount of units derived from a polar comonomer selected from the group consisting of alkyl acrylates, alkyl methacrylates, vinyl acetate, and mixtures thereof of more than 500 micromoles per gram of polar copolymer, wherein the polar copolymer is prepared by copolymerizing an olefin monomer and a polar comonomer.