Cyclic organosilicon compounds as electron donors for...

Details Cyclic organosilicon compounds as electron donors for... Cyclic organosilicon compounds as electron donors for...

2009-04-13

2009-11-17

Seidleck, James (Department: 1796)

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

C502S125000

Reexamination Certificate

active

07619049

ABSTRACT:
Cyclic organosilicon compounds that may be employed as an electron donor for polymerization catalyst systems, polymerization catalyst systems employing the cyclic organosilicon compounds as an electron donor, methods of making the polymerization catalyst systems, and polymerization processes to produce polyolefin are disclosed. The organosilicon compounds, which are useful as electron donors in polymerization catalyst systems for the production of polyolefins, are represented by the following formula:wherein Q1and Q2may be identical or different and are each hetero-atoms selected from the group consisting of N, O, S, Si, B, and P, with the proviso that Q1and Q2cannot both be N or both be O. R1and R2may be identical or different and are each hydrocarbon-based substituents to Q1and Q2, respectively. The subscripts m and n are independently 0 to 3. R3is an aliphatic, alicyclic or aromatic group. R4is a hydrocarbon group with 1 to 6 carbon atoms. R5is a bridging group with a backbone chain length between the two hetero-atoms Q1and Q2being 1-8 atoms. The bridging group is selected from the group consisting of aliphatic, alicyclic, and aromatic bivalent radicals.

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