Cyclic olefin copolymers and methods of making them
AssigneeExxonMobil Chemical Patents Inc.
InventorsYong Yang, Donna J. Crowther, Jacqueline A. Lovell
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Abstract
A process for making a branched cyclic olefin copolymer (bCOC), and the bCOC therefrom, comprising combining at a temperature within a range from 60° C. to 140° C. a catalyst precursor and an activator with a feed comprising ethylene and at least one cyclic olefin; where the catalyst precursor is selected from the group consisting of CS-symmetric Group 4 metallocenes comprising any two ligands selected from cyclopentadienyl and ligands isolobal to the cyclopentadienyl group. The resulting bCOC is desirably semi-crystalline and useful in such articles as tubing, thermoformed and foamed articles.
Claims11
A composition comprising a polyethylene and a branched cyclic olefin copolymer (bCOC) in the range from 0.2 wt % to 10 wt % of the composition, the bCOC consisting essentially of ethylene derived monomer units, and cyclic olefin derived monomer units in the range from 1 mol % to 8 mol % based on the total moles of monomer units of bCOC, wherein the bCOC has one or more glass-transition temperatures (Tg), the largest of which has a Tg that is within the range from −20° C. to 20° C.;
- and wherein the composition possesses a Strain Hardening Ratio (SHR) at 2.5 Heneky strain of greater than 1.0.
Dependencies are inferred from the claim text.