Back to results
US 2020/0239605 A1Published application
Chromium (III) Catalyst Systems With Activator-Supports
AssigneeChevron Phillips Chemical Company LP
InventorsMax P. McDaniel, Mark L. Hlavinka, Kathy S. Clear
Life of this patent
Estimating the term…
Abstract
Methods for preparing supported chromium catalysts containing a chromium (III) compound and an activator-support are disclosed. These supported chromium catalysts can be used in catalyst compositions for the polymerization of olefins to produce polymers having low levels of long chain branching, and with greater sensitivity to the presence of hydrogen during polymerization.
Claims27
1-20. (canceled)
An ethylene polymer having:
- a Mw in a range from about 400,000 to about 900,000 g/mol;
- a ratio of Mw/Mn in a range from about 70 to about 200;
- and
- less than or equal to about 0.002 LCB per 1000 total carbon atoms.
1 more element
An ethylene polymer having:
- a ratio of Mw/Mn in a range from about 70 to about 200;
- a HLMI of less than or equal to about 1 g/10 min;
- and
- less than or equal to about 0.002 LCB per 1000 total carbon atoms.
1 more element
An ethylene polymer having:
- a Mw in a range from about 400,000 to about 900,000 g/mol;
- a ratio of Mw/Mn in a range from about 90 to about 200;
- and
- a ratio of Mz/Mw in a range from about 2 to about 6.
1 more element
A process to produce a supported chromium catalyst, the process comprising:
- (a) calcining an activator-support comprising a solid oxide treated with an electron-withdrawing anion at a calcination temperature in a range from about 400° C. to about 800° C.;
- (b) combining a chromium (III) compound with the activator-support to form a mixture;
- and
- (c) subjecting the mixture to a non-oxidizing atmosphere at a peak temperature in a range from about 25° C. to about 600° C. to produce the supported chromium catalyst.
1 more element
Dependencies are inferred from the claim text.