Patent ID: 8124709

Claim:
A composition comprising at least one block ethylene/α-olefin interpolymer comprising two or more substantially homogeneous intramolecular blocks comprising differing chemical or physical properties and having a difference in mole percent α-olefin content, delta comonomer, said intramolecular blocks characterized by possessing a most probable molecular weight distribution, wherein the ethylene/α-olefin block interpolymer is characterized by a molecular weight distribution, M w /M n , in the range of from about 1.4 to about 2.8 and by an average block index greater than zero and up to about 1.0; wherein the ethylene/a-olefin block interpolymer is mesophase separated and displays a reflection spectrum that reaches a value of at least 15 percent within the region of infrared, visible or ultraviolet light.