Block compositions in thermoplastic vulcanizate applications

A thermoplastic vulcanizate composition comprising or obtained from a reaction mixture comprising:

• a) a vulcanizable elastomer;
• b) a thermoplastic polyolefin;
• c) a cross-linking agent;
• and,
• d) a block composite,
• wherein the thermoplastic vulcanizate has a reduction in compression set at 70° C. of greater than 5% as compared to the thermoplastic vulcanizate without (d)
• wherein the block composite comprises a soft copolymer, a hard polymer and a block copolymer having a soft segment and a hard segment, wherein the hard segment of the block copolymer is the same composition as the hard polymer in the block composite and the soft segment of the block copolymer is the same composition as the soft copolymer of the block composite and the hard segment comprises 80 wt % to 100 wt % propylene and wherein the block composite is present in an amount of 1 wt % to 30 wt %.