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US 8,637,616 B2Granted
Bridged metallocene catalyst systems with switchable hydrogen and comonomer effects
AssigneeChevron Philips Chemical Company LP
InventorsRichard M. Buck, Qing Yang, Albert P. Masino, Christopher E. Wittner
Life of this patent
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Abstract
The present invention provides polymerization processes utilizing an ansa-metallocene catalyst system for the production of olefin polymers. Polymers produced from the polymerization processes have properties that vary based upon the presence or the absence of hydrogen and/or comonomer in the polymerization process.
Claims22
A catalyst composition comprising:
- (i) an activator-support comprising a solid oxide treated with an electron-withdrawing anion;
- and
- (ii) an ansa-metallocene compound having formula (I):
- E(CpARAm)(CpBRBn)MXq (I),
- wherein:
- an activity of the catalyst composition in an ethylene/α-olefin polymerization is substantially constant over a range of from about 100 ppm to about 500 ppm added hydrogen under slurry polymerization conditions, using isobutane as a diluent, with a polymerization temperature of 90° C., and a reaction pressure of 390 psig;
- M is Ti, Zr, Hf, Cr, Sc, Y, La, or a lanthanide;
- CpA and CpB independently are a cyclopentadienyl, indenyl, or fluorenyl group;
- each RA and RB independently is a hydrocarbyl, hydrocarbylsilyl, hydrocarbylamino, or hydrocarbyloxide group having up to 18 carbon atoms;
- E is a bridging chain of 3 to 8 carbon atoms or 2 to 8 silicon, germanium, or tin atoms, wherein any substituents on atoms of the bridging chain independently are H or a hydrocarbyl group having up to 18 carbon atoms;
- each X independently is F;
- Cl;
- Br;
- I;
- methyl;
- benzyl;
- phenyl;
- H;
- BH4;
- OBR2 or SO3R, wherein R is an alkyl or aryl group having up to 18 carbon atoms;
- or a hydrocarbyloxide group, a hydrocarbylamino group, or a hydrocarbylsilyl group, any of which having up to 18 carbon atoms;
- m is 0, 1, 2, 3, or 4;
- n is 0, 1, 2, 3, or 4;
- q is 2 when M is Ti, Zr, or Hf;
- and
- q is 1 when M is Cr, Sc, Y, La, or a lanthanide.
23 more elements
A catalyst composition comprising:
- (i) an activator-support comprising a solid oxide treated with an electron-withdrawing anion;
- and
- (ii) an ansa-metallocene compound having formula (I):
- E(CpARAm)(CPBRBn)MXq (I),
- wherein:
- an activity of the catalyst composition in an ethylene/α-olefin polymerization is substantially constant over a range of from about 100 ppm to about 500 ppm added hydrogen under slurry polymerization conditions, using isobutane as a diluent, with a polymerization temperature of 90° C., and a reaction pressure of 390 psig;
- M is Ti, Zr, or Hf;
- CpA and CpB independently are a cyclopentadienyl, indenyl, or fluorenyl group;
- each RA and RB independently is a hydrocarbyl, hydrocarbylsilyl, hydrocarbylamino, or hydrocarbyloxide group having up to 18 carbon atoms;
- E is —SiMe2—SiMe2—;
- each X independently is F;
- Cl;
- Br;
- I;
- methyl;
- benzyl;
- phenyl;
- H;
- BH4;
- OBR2 or SO3R, wherein R is an alkyl or aryl group having up to 18 carbon atoms;
- or a hydrocarbyloxide group, a hydrocarbylamino group, or a hydrocarbylsilyl group, any of which having up to 18 carbon atoms;
- m is 0, 1, 2, 3, or 4;
- n is 0, 1, 2, 3, or 4;
- and
- q is 2.
22 more elements
A catalyst composition comprising:
- (i) an activator-support comprising a solid oxide treated with an electron-withdrawing anion;
- and
- (ii) an ansa-metallocene compound having formula (II), (III), (IV), (V), (VI), or (VII):
- wherein:
- an activity of the catalyst composition in an ethylene/α-olefin polymerization is substantially constant over a range of from about 100 ppm to about 500 ppm added hydrogen under slurry polymerization conditions, using isobutane as a diluent, with a polymerization temperature of 90° C., and a reaction pressure of 390 psig;
- M is Ti, Zr, or Hf;
- each RA and RB independently is a hydrocarbyl, hydrocarbylsilyl, hydrocarbylamino, or hydrocarbyloxide group having up to 18 carbon atoms;
- each X independently is F;
- Cl;
- Br;
- I;
- methyl;
- benzyl;
- phenyl;
- H;
- BH4;
- OBR2 or SO3R, wherein R is an alkyl or aryl group having up to 18 carbon atoms;
- or a hydrocarbyloxide group, a hydrocarbylamino group, or a hydrocarbylsilyl group, any of which having up to 18 carbon atoms;
- each m is 0, 1, 2, 3, or 4, m′ is 0, 1 or 2, and m″ is 0, 1, or 2;
- each n is 0, 1, 2, 3, or 4, each n′ is 0, 1, or 2, and each n″ is 0, 1, or 2;
- and
- each RE, RF, RG, and RH independently is H or a hydrocarbyl group having up to 18 carbon atoms.
19 more elements
Dependencies are inferred from the claim text.