Patent ID: 8022144

Claim:
A polyolefin elastomeric composition, the composition consisting essentially of: (a) a propylene-based elastomer having at least seventy-five weight percent (75 wt %) units derived from propylene and from thirteen to seventeen weight percent (13-17 wt %) units derived from a C2, or a C4-C10 alpha olefin, the propylene-based elastomer exhibiting: (1) a heat of fusion by DSC analysis of from 1 Joules/gram to 35 Joules/gram; (2) a weight average molecular (Mw) of from 54000 to 875000 g/mol; and (3) a permanent set of less than 40%; and (b) a homogeneous ethylene-alpha olefin interpolymer selected from a substantially linear polyethylene and a homogeneously branched linear polyethylene having a molecular weight distribution (Mw/Mn) of less than 3.5, a density from 0.885 to 0.915 g/ml, and a heat of fusion of from 65 to 125 Joules/gram, wherein the weight ratio of the propylene-based elastomer to the homogeneous ethylene-alpha olefin interpolymer is from 97:3 to 80:20, and wherein the composition exhibits a heat of fusion from 2 to 55 Joules/gram, and a 2% secant flexural modulus of less than 69 MPa.