Process for producing polymer compositions
First Claim
1. A polymerization process comprising:
- copolymerizing a plurality of monomers comprising (i) a first C2-C20 α
-olefin monomer;
(ii) a second C2-C20 α
-olefin monomer different from the first, and optionally; and
(iii) one or more dienes in the presence of a vinyl-terminated polymer-forming (VTP) catalyst system and a high molecular weight polymer-forming (HMP) catalyst system, thereby forming a copolymer composition comprising one or more copolymers;
wherein;
(a) the HMP catalyst system comprises a HMP catalyst compound and a first activator;
(b) the VTP catalyst system comprises a VTP catalyst compound and a second activator; and
(c) the VTP catalyst compound has the structural formula;
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Abstract
Processes are provided which include copolymerization using one or both of a metallocene catalyst capable of producing high molecular weight polymers and a metallocene catalyst capable of producing polymers having 60% or more vinyl terminations. Polymerization processes include dual catalyst polymerization in a single polymerization zone comprising both metallocene catalysts. Other processes include serial or parallel polymerizations in multiple polymerization zones, using either or both catalysts in each polymerization zone. Such polymerization processes produce reactor blends, and are particularly suited for producing copolymer compositions (such as EP or EPDM copolymer compositions) exhibiting improved melt elasticity and rheological properties.
17 Citations
25 Claims
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1. A polymerization process comprising:
- copolymerizing a plurality of monomers comprising (i) a first C2-C20 α
-olefin monomer;
(ii) a second C2-C20 α
-olefin monomer different from the first, and optionally; and
(iii) one or more dienes in the presence of a vinyl-terminated polymer-forming (VTP) catalyst system and a high molecular weight polymer-forming (HMP) catalyst system, thereby forming a copolymer composition comprising one or more copolymers;wherein; (a) the HMP catalyst system comprises a HMP catalyst compound and a first activator; (b) the VTP catalyst system comprises a VTP catalyst compound and a second activator; and (c) the VTP catalyst compound has the structural formula; - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
- copolymerizing a plurality of monomers comprising (i) a first C2-C20 α
Specification