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US 12,209,176 B2Granted
Ethylene-cyclic mono olefin copolymerizations
AssigneeNOVA Chemicals (International) S.A.
InventorsQinyan Wang, XiaoChuan Wang, Peter Zoricak, Steven Clemens, Brian Molloy
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Abstract
The copolymerization of ethylene with a cyclic mono olefin (such as norbornene) is conducted in the presence of a catalyst system comprising a bridged hafnocene catalyst and a three part activator. The catalyst system provides excellent activity at high polymerization temperatures. Copolymers produced according to this invention have unique microstructure (with methyl branching being observed) and unique rheology.
Claims2
An ethylene-norbornene copolymer characterized by having a phase angle of less than 70° at a complex modulus of 10000 Pa;
- a melt strain hardening index, MSHI, of less than 0.98;
- a norbornene content of from 0.5 to 60 weight %;
- and from 0.5 to 3 methyl branches per 1000 carbon atoms.
Dependencies are inferred from the claim text.