Patent ID: 8168718
Filing Date: 2012-05-01
Classification: C08L,Y10T

Abstract:
1. A thermoplastic vulcanizate comprising: dynamically-cured rubber comprising an elastomeric copolymer, where the elastomeric copolymer is a terpolymer polymerized from ethylene, propylene, and nonconjugated diene monomer; from about 5 to about 40% by weight of a non-functionalized propylene-based thermoplastic polymer characterized by a crystallinity in excess of 2% and less than 25%, a flexural modulus, per ASTM D-790A at 23° C., less than 150 MPa, a melt temperature of at least 100° C. and less than 250° C., and a melt flow rate, per ASTM D-1238 at 230° C. and 2.16 kg/load, of about 0.2 to about 1,000 dg/min.; from about 5 to about 60% by weight of a maleated propylene-based polymer having a melt flow rate from about 20 to about 2,000 dg/min per ASTM D-1238 at 230° C. and 2.1 kg load and the maleated polypropylene-based polymer has at least 0.2% by weight functionalization; and from about 0.5 to about 20% by weight of a functionalized tackifier resin comprising a maleated hydrocarbon resin, based on the total weight of the rubber and thermoplastic polymer combined, where the functionalized tackifier resin is characterised by a softening point of from about 15° C. to about 210° C., as determined by ASTM E-28(Rev. 1996), a glass transition temperature of less than 120° C., as determined by ASTM D 341-88 by DSC, a saponification number of greater than 10, and an acid number of greater than 10.