Patent ID: 8247495

Claim:
An elastomeric polymer composition comprising a polymer blend comprising a first polymer and a second polymer, wherein: a. the first polymer comprises from about 70 wt % to about 90 wt % units derived from propylene and from about 10 wt % to about 30 wt % units derived from ethylene and/or a C 4 -C 10 alpha-olefin; b. the second polymer comprises from about 88 wt % to about 98 wt % units derived from propylene and from about 2 wt % to about 12 wt % units derived from ethylene and/or a C 4 -C 10 alpha-olefin; and c. the elastomeric polymer composition is characterized by two or more of the following properties: i. an overall propylene content of between about 75 wt % and about 90 wt %; ii. a melting point between about 110° C. and about 145° C.; iii. a Vicat softening point greater than about 45° C.; iv. a tensile stress at 300% strain of less than about 500 psi (3447 kPa), as determined by a stress strain test according to ASTM D412; or v. an average maximum force for pellet separation of less than about 10 N in an accelerated storage stability test, wherein the polymer composition has at least one of (i) a tension set value of less than 12%, and/or (ii) a tensile stress at 300% strain of less than about 400 psi (2758 kPa), as determined by a stress strain test according to ASTM D412.