POLYMERIZATION OF ALPHA OLEFINS
Herein discussed is a method of producing a polyolefin blend, comprising providing a catalyst system comprising a first catalyst, a second catalyst, a first co-catalyst, a second co-catalyst, and a third co-catalyst; polymerizing at least one monomer in a single step; obtaining the polyolefin blend having a Kinematic viscosity (Kv) of 6 to 1000 cSt at 100 degrees C., wherein the Kv is adjusted by varying the ratio of the first catalyst to the second catalyst without mixing separately-synthesized polymers.
1 . A method of producing a poly-olefin blend comprising
providing a catalyst system comprising a first catalyst, a second catalyst, a first co-catalyst, a second co-catalyst, and a third co-catalyst;
polymerizing at least one monomer in a single step;
obtaining the poly-olefin blend having a Kinematic viscosity (Kv) of 6-1000 at 100 degrees C., wherein said Kv is adjusted by varying the ratio of the first catalyst to the second catalyst without mixing separately-synthesized polymers.
2 . The method of claim 1 , wherein said monomer does not contain ethylene, propylene, butene, or pentene.
3 . The method of claim 1 , wherein the produced poly-alpha-olefin is a homopolymer.
4 . The method of claim 1 , wherein the produced poly-alpha-olefin is a copolymer.
5 . The method of claim 1 , comprising no second oligomerization step and no use of oligomerization catalyst.
6 . The method of claim 1 , wherein no solvent is used in the polymerization step.
7 . The method of claim 1 , wherein said first catalyst comprises ethylenebis(indenyl) zirconium dichloride.
8 . The method of claim 1 , wherein said second catalyst comprises dimethylsilylbis(tetrahydro indenyl) zirconium dichloride.
9 . The method of claim 1 , wherein said first co-catalyst comprises N,N-dimethylaniliniumtetrakis(pentafluorophenyl) borate.
10 . The method of claim 1 , wherein said second co-catalyst comprises methylaluminoxane.
11 . The method of claim 1 , wherein said third co-catalyst comprises diisobutylaluminum hydride or triisobutylaluminum.
12 . The method of claim 1 , wherein the weight percentage of the first catalyst based on the total weight of the first and second catalysts is in the range of from 0 to 100 wt %.
13 . The method of claim 1 , wherein molar ratios of the first catalyst to each of the co-catalysts based on the active metal of the first catalyst are not varied.
14 . The method of claim 1 comprising isolating the poly-olefin blend.
15 . The method of claim 14 wherein said isolating comprises diluting with a solvent, washing with an acid, filtering, removing the solvent and unreacted monomer under vacuum, or combinations thereof.
16 . A catalyst system comprising a first catalyst, a second catalyst, a first co-catalyst, a second co-catalyst, and a third co-catalyst, wherein molar ratios of the first catalyst to each of the co-catalysts based on the active metal of the first catalyst are not varied.
17 . The catalyst system of claim 16 , wherein said first catalyst comprises ethylenebis(Indenyl) zirconium dichloride.
18 . The catalyst system of claim 16 , wherein said second catalyst comprises dimethylsilylbis(tetrahydro indenyl) zirconium dichloride.
19 . The catalyst system of claim 16 , wherein said first co-catalyst comprises N,N-dimethylaniliniumtetrakis(pentafluorophenyl) borate.
20 . The catalyst system of claim 16 , wherein said second co-catalyst comprises methylaluminoxane.
21 . The catalyst system of claim 16 , wherein said third co-catalyst comprises diisobutylaluminum hydride or triisobutylaluminum.
22 . The catalyst system of claim 16 capable of producing a custom poly-alpha-olefin blend in a single polymerization step, wherein said custom poly-alpha-olefin blend has a Kinematic viscosity (Kv) adjusted by varying the ratio of the first catalyst to the second catalyst without mixing separately-synthesized polymers.
23 . The catalyst system of claim 16 , wherein the weight percentage of the first catalyst based on the total weight of the first and second catalysts is in the range of from 0 to 100 wt %.
24 . The catalyst system of claim 16 comprising a metallocene catalyst of racemic structure, not of meso structure.
25 . The catalyst system of claim 16 comprising no solid support for the co-catalysts.