Process for the polymerization of alpha olefins and non-conjugated dienes using a toluene free homogenous co-catalyst system with metallocene pro-catalysts

摘要

A homogenous toluene free catalyst system for producing a polyolefin elastomer possessing a unique combination of properties employing a particular type of a metallocene catalyst. The homogenous toluene free catalyst system having a co-catalyst for activating the metallocene pro-catalyst employing a specific molar ratio of the components of the co-catalyst blend to the metal of the pro-catalyst.

主权项

1. A process for the polymerization or copolymerization of at least one alpha olefin, and optionally at least one diene monomer, to obtain an elastomer, the process consisting of:
a. forming a catalytically effective homogenous solution of toluene free aliphatic hydrocarbon catalyst mixture by blending together:
(i) a co-catalyst blend consisting of:
(a) a modified methylaluminoxane (MMAO), alkylaluminum alkoxide, siloxalane, dimeric aluminoxane, or oligomeric aluminoxane in an aliphatic hydrocarbon; and(b) a boron component having the formula M-R3, wherein the M is a boron, and R is an alkyl group, aryl group or combinations thereof, with each alkyl or aryl group possessing at least one electron-withdrawing substituent; and(ii) a metallocene pro-catalyst comprising a transition metal; and b. polymerizing the at least one alpha olefin in the presence of the catalytically effective homogenous solution of toluene free aliphatic hydrocarbon catalyst to form a polyolefin elastomer.