| 主权项 |
1. A thermoplastic elastomer,comprising:
about 60 wt % to about 90 wt % of at least partially cured metallocene-produced ethylene-propylene-vinyl norbornene elastomeric rubber component, wherein the vinyl norbornene content of the rubber component is 0.2 wt % to 1.5 wt % and the ethylene content is 50 wt % to 80 wt %; and about 10 wt % to about 40 wt % of at least one thermoplastic component; wherein the rubber component is at least partially cured using a peroxide curative to yield a cure level of the rubber component of at least 95%, wherein the rubber component has a molecular weight distribution (MWD) of less than 4, a weight average molecular weight (Mw) of from 50,000 to 150,000 g/mole, a branching index greater than 0.70, and a Mooney viscosity, ML(1+4 at 125° C.), as determined according to ASTM D1646, of 10 to 26.2; andwherein the thermoplastic elastomer has (as determined according to ASTM D412):an ultimate tensile stength of 3.6-5.1 MPa, an elongation at break of 124% to 222%, and a tension set of 10.0% to 23.0%. |
