Addition of aluminum alkyl for improved metallocene catalyst

Details Addition of aluminum alkyl for improved metallocene catalyst Addition of aluminum alkyl for improved metallocene catalyst

1992-02-04

1996-05-21

Nagumo, Mark

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526128, 526131, 526132, 526133, C08F 4643, C08F 4642

Patent

active

055191002

ABSTRACT:
This invention is for a catalyst system for polymerization of olefins using an ionic metallocene catalyst with aluminum alkyl. The metallocene catalyst is an ion pair formed from a neutral metallocene compound and an ionizing compound. The invention can be used in any method of producing ionic metallocene catalyst. Use of aluminum alkyl with an ionic metallocene catalyst eliminates the need for using methylaluminoxane (MAO). Catalysts produced by the method of this invention have high activity. The invention reduces catalyst poisons which cause low activity, no activity or uncontrolled polymerizations. Polymerizations using this catalyst system are reproducible and controllable.

REFERENCES:
patent: 3242099 (1966-03-01), Manyik et al.
patent: 3756998 (1973-09-01), Karapinka
patent: 4808561 (1989-02-01), Welborn, Jr.
patent: 5241025 (1993-08-01), Hlatky et al.
"Multiple Metal-Carbon Bonds", R. R. Schrock, P. R. Sharp, J. Am. Chem. Soc., pp. 2389-2399, vol. 100, No. 8 (Apr. 2, 1978).
"Cationic Alkylbis(cyclopentadienyl)titanium Complexes", M. Bochmann, L. Wilson, Organometallics, pp. 2556-2563, vol. 6, (1987).
Insertion Reactions of Nitriles in Cationic Alkylbis(cyclopentadienyl)titanium Complexes, M. Bochmann, L. Wilson, organometallics, pp. 1147-1154, vol. 7 (1987).
"Ethylene Polymerization by a Cationic Dicyclopentadienylzirconium(IV) Alkyl Complex", R. F. Jordan, C. S. Bajgur, R. Willett, B. Scott, J. Am. Chem. Soc., pp. 7410-7411, vol. 108 (1986).
"Synthesis and Insertion Reactions of Cationic Alkylbis(cyclopentadienyl) titanium Complexes", M. Bochmann, L. M. Wilson, J. Chem. Soc. Commun., pp. 1610-1611, (1986).
Hawley's Condensed Chemical Dictionary, 11th Ed. Van Nostrand Reinhold, New York, 1987, (end sheet).

Affiliated with

Also associated with

Rating

Addition of aluminum alkyl for improved metallocene catalyst does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Addition of aluminum alkyl for improved metallocene catalyst, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Addition of aluminum alkyl for improved metallocene catalyst will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2038796