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US 8,501,651 B2Granted
Catalyst systems and polymer resins having improved barrier properties
AssigneeChevron Phillips Chemical Company LP
InventorsErrun Ding, Albert P. Masino, Joel L. Martin, Youlu Yu
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Abstract
A catalyst system comprising a half-sandwich chromium complex, an activator support and an optional cocatalyst. A compound of formula Cp′Cr(Cl)2(Ln), where Cp′ is η5—C5H4CH2CH2CH═CH2 and Ln is pyridine, THF or diethylether. A compound of formula Cp″Cr(Cl)2(Ln), where Cp″ is η5—C5H4C(Me)2CH2CH2CH═CH2 and Ln is pyridine, THF or diethylether.
Claims20
A catalyst system comprising a half-sandwich chromium complex, an activator support and an optional cocatalyst,
- wherein the half-sandwich chromium complex is characterized by the general formula:
- M(Z)(R1)(R2)(Ln)
- where M is chromium;
- Z comprises η5-C5H4CH2CH2CH═CH2 or η5-C5H4C(Me)2CH2CH2CH═CH2;
- R1 and R2 are independently a halide, an organyl group, or a hydrocarbyl group;
- Ln comprises a neutral electron donating group;
- and n=0, 1 or 2.
4 more elements
Dependencies are inferred from the claim text.