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US 2012/0108765 A1Published application
Polymerization catalysts for producing polymers with low melt elasticity
AssigneeChevron Phillips Chemical Company LP
InventorsQing Yang, Max P. McDaniel, Joel L. Martin, Youlu Yu, David C. Rohlfing, Michael D. Jensen
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Abstract
The present techniques relate to catalyst compositions, methods, and polymers encompassing a Group 4 metallocene compound comprising bridging η5-cyclopentadienyl-type ligands, typically in combination with a cocatalyst, and a activator. The compositions and methods presented herein include ethylene polymers with low melt elasticity.
Claims20
A method of polymerizing olefins, comprising:
- contacting an α-olefin with a catalyst composition under polymerization conditions to form a polymer;
- wherein the catalyst composition comprises the contact product of an ansa-metallocene, an organoaluminum compound, and an activator, wherein:
- the ansa-metallocene comprises a compound having the formula:
- wherein:
- M1 is zirconium or hafnium;
- X′ and X″ are independently F, Cl, Br, or I;
- E is C or Si;
- R1 and R2 are independently an alkyl group, an aryl group, or hydrogen;
- R3A and R3B are independently a hydrocarbyl group, a trihydrocarbylsilyl group, or hydrogen;
- n is an integer from 0 to 10, inclusive;
- R4A and R4B are independently a hydrocarbyl group;
- and
- the activator comprises an activator-support comprising a solid oxide treated with an electron-withdrawing anion.
10 more elements
A method of polymerizing olefins, comprising:
- contacting an α-olefin with a catalyst composition under polymerization conditions to form a polymer;
- wherein the catalyst composition comprises the contact product of an ansa-metallocene and an activator, wherein:
- the ansa-metallocene comprises a compound having the formula:
- wherein:
- M1 is zirconium or hafnium;
- X′ and X″ are independently H, BH4, methyl, phenyl, benzyl, neopentyl, trimethylsilylmethyl, CH2CMe2Ph, CH2SiMe2Ph, CH2CMe2CH2Ph, or CH2SiMe2CH2Ph;
- E is C or Si;
- R1 and R2 are independently an alkyl group, an aryl group, or hydrogen;
- R3A and R3B are independently a hydrocarbyl group, a trihydrocarbylsilyl group, or hydrogen;
- n is an integer from 0 to 10, inclusive;
- R4A and R4B are independently a hydrocarbyl group;
- and
- the activator comprises an activator-support comprising a solid oxide treated with an electron-withdrawing anion.
10 more elements
A process for manufacturing a product comprising a polyolefin, the process comprising the acts of:
- manufacturing a product at least a portion of which comprises a polyolefin, wherein the polyolefin is produced by a method comprising the act of:
- contacting an α-olefin with a catalyst composition under polymerization conditions to form a polymer;
- wherein the catalyst composition comprises the contact product of an ansa-metallocene and an activator, wherein:
- the ansa-metallocene comprises a compound having the formula:
- wherein:
- M1 is zirconium or hafnium;
- X′ and X″ are independently F, Cl, Br, or I;
- E is C or Si;
- R1 and R2 are independently an alkyl group, an aryl group, or hydrogen;
- R3A and R3B are independently a hydrocarbyl group, a trihydrocarbylsilyl group, or hydrogen;
- n is an integer from 0 to 10, inclusive;
- R4A and R4B are independently a hydrocarbyl group;
- and
- the activator comprises an activator-support comprising a solid oxide treated with an electron-withdrawing anion;
- and
- forming the polyolefin into the product.
13 more elements
Dependencies are inferred from the claim text.