Catalyst systems containing a bridged metallocene
AssigneeChevron Phillips Chemical Company LP
InventorsRichard M. Buck, Qing Yang, Albert P. Masino, Christopher E. Wittner
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Abstract
The present invention provides polymerization processes utilizing a catalyst system containing an ansa-metallocene and a second metallocene compound for the production of olefin polymers.
Claims26
A catalyst composition capable of producing an ethylene polymer having a narrower molecular weight distribution as hydrogen addition during polymerization is increased, the catalyst composition comprising:
- (i) an ansa-metallocene compound having formula (I):
- E(CpARAm)(CpBRBn)MXq (I),
- wherein:
- 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 H or 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;
- (ii) a second metallocene compound;
- and
- (iii) an activator.
A catalyst composition comprising:
- (i) an ansa-metallocene compound having formula (I):
- E(CpARAm)(CpBRBn)MXq (I),
- wherein:
- 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 group having up to 12 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;
- (ii) a second metallocene compound;
- and
- (iii) an activator.
A catalyst composition capable of producing an ethylene polymer having a narrower molecular weight distribution as hydrogen addition during polymerization is increased, the catalyst composition comprising:
- (i) an ansa-metallocene compound having formula (I):
- E(CpARAm)(CpBRBn)MXq (I),
- wherein:
- M is Ti, Zr, or Hf;
- CpA and CpB independently are a cyclopentadienyl, indenyl, or fluorenyl group;
- each RA and RB independently is H or a hydrocarbyl group having up to 12 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;
- (ii) a second metallocene compound;
- and
- (iii) an activator.
Dependencies are inferred from the claim text.