Olefin polymerization process using triisobutylaluminum as a...

Details Olefin polymerization process using triisobutylaluminum as a... Olefin polymerization process using triisobutylaluminum as a...

2005-06-07

2005-06-07

Wu, David W. (Department: 1713)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

C526S170000, C526S943000, C526S128000, C526S129000, C526S131000, C526S134000, C526S153000, C526S158000, C526S348200, C526S348500, C526S348600, C526S352000

Reexamination Certificate

active

06903170

ABSTRACT:
Ethylene and optional comonomers are polymerized using a supported metallocene catalyst, an alumoxane activator, and triisobutylaluminum (TIBAL). A silica support is first pretreated with a silane compound and then with an organoboron compound. The treated silica is then combined with a Group 4 metallocene complex and an alumoxane to generate a supported, activated catalyst. While it was previously thought that the particular support treatment technique used herein provided benefits only for polymerizations catalyzed by non-metallocene single-site complexes, it has now been found that similar benefits can be realized even with conventional metallocenes if TIBAL is selected as the scavenger.

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