Peroxide-cured thermoplastic vulcanizates prepared with ultrahigh molecular weight plastics

摘要

A thermoplastic vulcanizate comprising a dynamically cured rubber, where the rubber is peroxide cured, and a thermoplastic phase, where at least 10% by weight of the thermoplastic phase includes an ultrahigh molecular weight plastic, where the ultrahigh molecular weight plastic is characterized by a Mw that is greater than 0.8×106 g/mole.

主权项

1. A thermoplastic vulcanizate comprising:
a dynamically cured rubber, where the rubber is fully cured by a peroxide; and a thermoplastic phase, where 100% by weight of the thermoplastic phase includes an ultrahigh molecular weight plastic, where the ultrahigh molecular weight plastic is a propylene-based polymer including greater than 90 mole percent propylene mer units and is characterized by a weight average molecular weight (Mw) that is from 3.0×106 to 3,968×106 g/mole, a molecular weight distribution (Mw/Mn) of from 2.5 to less than 5, stereo defects of less than 50 per 10,000 carbon atoms, and a meso pentad fraction of greater than 96 mole % mmmm pentads, wherein the rubber is dynamically cured in the presence of the ultrahigh molecular weight plastic.