Compatibilized polyolefin blends

A composition, comprising:

• a) one or more polyethylene different from di;
• b) one or more polypropylene different from dii;
• c) one or more polyolefin elastomer;
• and
• d) a crystalline block composite comprising three components:
• i) a crystalline ethylene based polymer,
• ii) a crystalline propylene based polymer, and
• iii) a block copolymer having a crystalline ethylene based block and a crystalline propylene block,
• wherein the composition of component i) is the same as the crystalline ethylene based block of the block copolymer and the composition of component ii) is the same as the crystalline propylene block of the block copolymer, and
• wherein the one or more polyolefin elastomer includes an olefin block copolymer having an ethylene/α-olefin copolymer.