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US 8,383,540 B2Granted
Catalyst composition with halo-malonate internal electron donor and polymer from same
AssigneeDow Global Technologies LLC
InventorsLinfeng Chen, Tak W. Leung, Tao Tao
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Abstract
Disclosed herein are procatalyst compositions, catalyst compositions and polymers, i.e., propylene-based polymers, produced therefrom. The present procatalyst compositions contain a halo-malonate and a 2-fluoro-malonate in particular. The present catalyst compositions improve catalyst selectivity, improve catalyst activity, and also improve hydrogen response during polymerization. Propylene-based polymer produced from the present catalyst composition has a melt flow rate greater than 50 g/10 min.
Claims12
A catalyst composition comprising:
- a procatalyst composition comprising a magnesium moiety;
- a titanium moiety;
- and
- an internal electron donor comprising a 2-fluoro-malonate with the structure (II)
- wherein R1 and R2 are the same or different, and further wherein R1 is selected from the group consisting of a C3-C20 secondary alkyl group, a C4-C20 tertiary alkyl group, a C6-C20 aryl group, and a C7-C20 alkylaryl group;
- and
- R2 is selected from the group consisting of a C1-C20 primary alkyl group and a substituted or unsubstituted C2-C20 1-alkenyl group;
- a cocatalyst;
- and
- optionally an external electron donor.
7 more elements
Dependencies are inferred from the claim text.