Back to results
US 10,662,266 B2Granted
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.
Claims34
A catalyst composition comprising:
- a supported chromium catalyst comprising (a) a chromium (III) compound, or a derivative thereof;
- and (b) an activator-support comprising a solid oxide treated with an electron-withdrawing anion;
- and
- a co-catalyst;
- wherein:
- the chromium (III) compound comprises chromium (III) formate, chromium (III) acetate, chromium (III) propionate, chromium (III) butyrate, chromium (III) pentanoate, chromium (III) neopentanoate, chromium (III) hexanoate, chromium (III) 2-ethylhexanoate, chromium (III) benzoate, chromium (III) naphthenate, chromium (III) oleate, chromium (III) oxalate, chromium (III) acetylacetonate, chromium (III) stearate, chromium (III) laurate, a derivative thereof, or any combination thereof;
- and
- the activator-support comprises a fluorided solid oxide and/or a sulfated solid oxide.
5 more elements
A process to produce a supported chromium catalyst, the process comprising:
- (i) combining a chromium (III) compound with an activator-support comprising a solid oxide treated with an electron-withdrawing anion to form a mixture;
- and
- (ii) subjecting the mixture to a non-oxidizing atmosphere at a peak temperature to produce the supported chromium catalyst, wherein:
- the chromium (III) compound comprises chromium (III) formate, chromium (III) acetate, chromium (III) propionate, chromium (III) butyrate, chromium (III) pentanoate, chromium (III) neopentanoate, chromium (III) hexanoate, chromium (III) 2-ethylhexanoate, chromium (III) benzoate, chromium (III) naphthenate, chromium (III) oleate, chromium (III) oxalate, chromium (III) acetylacetonate, chromium (III) stearate, chromium (III) laurate, or any combination thereof;
- and
- the activator-support comprises fluorided alumina, chlorided alumina, bromided alumina, sulfated alumina, fluorided silica-alumina, chlorided silica-alumina, bromided silica-alumina, sulfated silica-alumina, fluorided silica-zirconia, chlorided silica-zirconia, bromided silica-zirconia, sulfated silica-zirconia, fluorided silica-titania, fluorided silica-coated alumina, sulfated silica-coated alumina, phosphated silica-coated alumina, or any combination thereof.
3 more elements
A process to produce a supported chromium catalyst, the process comprising:
- (i) combining a chromium (III) compound with an activator-support comprising a solid oxide treated with an electron-withdrawing anion to form a mixture;
- and
- (ii) 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, wherein:
- the chromium (III) compound comprises chromium (III) acetylacetonate;
- and
- the activator-support comprises a fluorided solid oxide and/or a sulfated solid oxide.
3 more elements
An ethylene polymer having:
- a Mw in a range from about 400,000 to about 1,000,000 g/mol;
- a ratio of Mw/Mn of greater than or equal to about 50;
- and
- a relaxation time of less than or equal to about 100 sec;
- wherein the ethylene polymer has a number of short chain branches per 1000 total carbon atoms that is greater at Mn than at Mw.
2 more elements
An ethylene polymer having:
- a Mw in a range from about 400,000 to about 1,000,000 g/mol;
- a ratio of Mw/Mn in a range from about 70 to about 200;
- a ratio of Mz/Mw in a range from about 2 to about 6;
- a HLMI of less than or equal to about 5 g/10 min;
- and
- a relaxation time of less than or equal to about 100 sec.
3 more elements
Dependencies are inferred from the claim text.