Patent ID: 8691714
Filing Date: 2014-04-08
Classification: C08F

Abstract:
1. A mixed catalyst system comprising: (i) at least one polymerization catalyst comprising a Group 4 or Group 5 transition metal; (ii) an activator; (iii) at least one organochromium polymerization catalyst; and (iv) a support material; wherein, the polymerization catalyst comprising a Group 4 or Group 5 transition metal has a negative molecular switch response and the organochromium polymerization catalyst has a positive molecular switch response, where the molecular switch is a compound comprising oxygen and an alkyl aluminum compound and the organochromium polymerization catalyst with the molecular switch present has an activity at least 50% greater than the activity of the polymerization catalyst comprising a Group 4 or Group 5 transition metal without the molecular switch present.