Catalyst for olefin polymerization and polyolefin prepared using the same
The present invention relates to a catalyst for olefin polymerization. Specifically, the present invention relates to a hybrid catalyst, which is capable of preparing a polyolefin, particularly a linear low-density polyethylene, which has excellent processability and is capable of providing a film having good mechanical and optical properties.
1. A catalyst for olefin polymerization, which comprises a first transition metal compound represented by Formula A and a second transition metal compound represented by Formula B:
in Formulae A and B,
n is an integer of 0 to 3,
is 2,
m and l are each an integer of 0 to 4,
M is titanium (Ti), zirconium (Zr), or hafnium (Hf),
X is each independently halogen, C 1-20 alkyl, C 2-20 alkenyl, C 2-20 alkynyl, C 6-20 aryl, C 1-20 alkyl C 6-20 aryl, C 6-20 aryl C 1-20 alkyl, C 1-20 alkylamido, C 6-20 arylamido, or C 1-20 alkylidene,
Q is carbon (C), silicon (Si), germanium (Ge), or tin (Sn),
R 1 , and R 3 to R 5 are each independently substituted or unsubstituted C 1-20 alkyl, substituted or unsubstituted C 2-20 alkenyl, substituted or unsubstituted C 6-20 aryl, substituted or unsubstituted C 1-20 alkyl C 6-20 aryl, substituted or unsubstituted C 6-20 aryl C 1-20 alkyl, or that R 1 and R 2 are optionally is linked to adjacent groups to form a substituted or unsubstituted unsaturated C 4-20 ring and
R 6 and R 7 are each independently substituted or unsubstituted C 1-20 alkyl, substituted or unsubstituted C 2-20 alkenyl, substituted or unsubstituted C 6-20 aryl, substituted or unsubstituted C 1-20 alkyl C 6-20 aryl, substituted or unsubstituted C 6-20 aryl C 1-20 alkyl, provided that at least one of R 6 and R 7 is substituted or unsubstituted C 1-20 alkyl,
wherein olefin polymer prepared from the catalyst has a molecular weight distribution represented as a polydispersity index (Mw/Mn) of 2.0 to 5.5.
2. The catalyst for olefin polymerization of claim 1 ,
wherein m and l are each 1 or 2, X is each independently halogen, M is zirconium, Q is carbon, R 1 is C 1-20 alkyl or linked to adjacent groups to form a substituted or unsubstituted unsaturated C 4-20 ring, R 3 to R 5 are each C 1-20 alkyl, and R 6 and R 7 are each C 1-20 alkyl, C 2-20 alkenyl, or C 6-20 aryl, provided that at least one of R 6 and R 7 is C 1-20 alkyl.
3. The catalyst for olefin polymerization of claim 2 ,
wherein the compound represented by Formula A is one of the compounds represented by Formulae A-1 to A-4, and the compound represented by Formula B is one of the compounds represented by Formulae B-1 to B-3:
4. The catalyst for olefin polymerization of claim 1 ,
which comprises the first transition metal compound and the second transition metal compound at a weight ratio of 20:1 to 1:20.
5. The catalyst for olefin polymerization of claim 1 ,
which further comprises a cocatalyst compound selected from the group consisting of a compound represented by Formula 1, a compound represented by Formula 2, and a compound represented by Formula 3:
[L-H] + [Z(A) 4 ] − or [L] + [Z(A) 4 ] − [Formula 3]
in Formula 1, n is an integer of 2 or more, and R a may each independently be a halogen atom, C 1-20 hydrocarbon, or C 1-20 hydrocarbon substituted with halogen,
in Formula 2, D is aluminum (Al) or boron, and R b , R c , and R d are each independently a halogen atom, C 1-20 hydrocarbon, C 1-20 hydrocarbon substituted with halogen, or C 1-20 alkoxy, and
in Formula 3, L is a neutral or cationic Lewis acid, [L-H] + and [L] + a Brönsted acid, Z is a group 13 element, and A is each independently substituted or unsubstituted C 6-20 aryl or substituted or unsubstituted C 1-20 alkyl.
6. The catalyst for olefin polymerization of claim 5 ,
wherein the compound represented by Formula 1 is at least one selected from the group consisting of methylaluminoxane, ethylaluminoxane, isobutylaluminoxane, and butylaluminoxane.
7. The catalyst for olefin polymerization of claim 5 ,
wherein the compound represented by Formula 2 is at least one selected from the group consisting of trimethylaluminum, triethylaluminum, triisobutylaluminum, tripropylaluminum, tributylaluminum, dimethylchloroaluminum, triisopropylaluminum, tri-s-butylaluminum, tricyclopentylaluminum, tripentylaluminum, triisopentyaluminum, trihexyaluminum, trioctyaluminum, ethyldimethylaluminum, methyldiethylaluminum, triphenylaluminum, tri-p-tolylaluminum, dimethylaluminummethoxide, dimethylaluminumethoxide, trimethylboron, triethylboron, triisobutylboron, tripropylboron, and tributylboron.
8. The catalyst for olefin polymerization of claim 5 ,
wherein the compound represented by Formula 3 is at least one selected from the group consisting of triethylammonium tetraphenylborate, tributylammonium tetraphenylborate, trimethylammonium tetraphenylborate, tripropylammonium tetraphenylborate, trimethylammonium tetra (p-tolyl) borate, trimethylammonium tetra (o,p-dimethylphenyl) borate, tributylammonium tetra (p-trifluoromethylphenyl) borate, trimethylammonium tetra (p-trifluoromethylphenyl) borate, tributylammonium tetrapentafluorophenylborate, N,N-diethylanilinium tetraphenylborate, N,N-diethylanilinium tetrapentafluorophenylborate, diethylammonium tetrapentafluorophenylborate, triphenylphosphonium tetraphenylborate, trimethylphosphonium tetraphenylborate, triethylammonium tetraphenylaluminate, tributylammonium tetraphenylaluminate, trimethylammonium tetraphenylaluminate, tripropylammonium tetraphenylaluminate, trimethylammonium tetra (p-tolyl) aluminate, tripropylammonium tetra (p-tolyl) aluminate, triethylammonium tetra (o p-dimethylphenyl) aluminate, tributylammonium tetra (p-trifluoromethylphenyl) aluminate, trimethylammonium tetra (p-trifluoromethylphenyl) aluminate, tributylammonium tetrapentafluorophenylaluminate, N,N-diethylanilinium tetraphenylaluminate, N,N-diethylanilinium tetrapentafluorophenylaluminate, diethylammonium tetrapentatetraphenylaluminate, triphenylphosphonium tetraphenylaluminate, trimethylphosphonium tetraphenylaluminate, tripropylammonium tetra (p-tolyl) borate, triethylammonium tetra (o,p-dimethylphenyl) borate, tributylammonium tetra (p-trifluoromethylphenyl) borate, triphenylcarbonium tetra (p-trifluoromethylphenyl) borate, and triphenylcarbonium tetrapentafluorophenylborate.
9. The catalyst for olefin polymerization of claim 1 ,
which further comprises a carrier for supporting the first transition metal compound, the second transition metal compound, or both.
10. The catalyst for olefin polymerization of claim 9 ,
wherein the carrier supports all of the first transition metal compound, the second transition metal compound, and the cocatalyst.
11. The catalyst for olefin polymerization of claim 10 ,
wherein the total amount of the first transition metal compound and the second transition metal compound supported on a carrier is 0.001 to 1 mmole based on 1 g of the carrier, and the amount of the cocatalyst compound supported on a carrier is 2 to 15 mmoles based on the 1 g of the carrier.
12. The catalyst for olefin polymerization of claim 9 ,
wherein the carrier comprises at least one selected from the group consisting of silica, alumina, and magnesia.
13. The catalyst for olefin polymerization of claim 9 ,
which is a hybrid supported catalyst in which the first transition metal compound and the second transition metal compound are supported together.
14. The catalyst for olefin polymerization of claim 9 ,
which is a hybrid supported catalyst in which the first transition metal compound, the second transition metal compound, and the cocatalyst compound are supported together on silica.