Chemical compound, method for the production thereof and its use in catalyst systems for producing polyolefins
The invention relates to a chemical compound of formula (I), wherein M 1 represents an element selected from main groups II, III or IV of the periodic table of elements; x is equal to 1, 2, 3 or 4; y is equal to 2, 3 or 4, and; A represents a cation of main group V of the periodic table of elements; R 1 is the same or different and represents a branched or unbranched linear or cyclic C 1 –C 40 group that contains carbon; R 2 is the same or different and represents a branched or unbranched linear or cyclic C 1 –C 40 group that contains carbon; R 3 represents a branched or unbranched linear or cyclic C 1 –C 40 group that contains carbon, and; R 4 represents a hydrogen atom; whereby R 2 and R 3 are always different from one another
1. A chemical compound of formula I,
where
M 1 is boron,
x is 4,
y is 2,
A is nitrogen,
R 1 are identical or different and are each C 6 –C 40 -haloaryl, C 6 –C 40 -aryloxy, C 7 –C 40 -arylalkyl, C 7 –C 40 -haloarylalkyl, C 7 –C 40 -haloalkylaryl or C 4 –C 40 -cycloalkyl,
R 2 are identical or different and are each C 1 –C 6 -alkyl,
R 3 is C 7 –C 20 -arylalkyl, and
R 4 is a hydrogen atom.
2. A compound of formula I as claimed in claim 1 , wherein R 3 is C 7 -arylalkyl.
3. A compound of formula I as claimed in claim 1 which is
N,N-diethylbenzylammonium tetrakis(pentafluorophenyl)borate,
N,N-diisopropylbenzylammonium tetrakis(pentafluorophenyl)borate or
N,N-dimethylbenzylammonium tetrakis(pentafluorophenyl)borate.
4. A catalyst system comprising
A) at least one organometallic transition metal compound,
B) at least one compound of formula IV
wherein R 20 are identical or different and are each halogen atoms, a hydrogen atom, C 1 –C 20 -alkyl, C 1 –C 20 -haloalkyl, C 6 –C 20 -aryl, C 6 –C 20 -haloaryl, C 7 –C 40 -arylalkyl, C 7 –C 40 -haloarylalkyl, C 7 –C 40 -alkylaryl or C 7 –C 40 -haloalkylaryl,
C) at least one support component and
D) at least one compound of formula I
wherein
M 1 is boron,
x is 4,
y in 2,
A is nitrogen
R 1 are identical or different and are each C 6 –C 40 -haloaryl, C 6 –C 40 -aryloxy, C 7 –C 40 -arylalkyl, C 7 –C 40 -haloarylalkyl, C 7 –C 40 -haloalkylaryl or C 4 –C 40 -cycloalkyl,
R 2 are identical or different and are each C 1 –C 6 -alkyl,
R 3 is C 7 –C 20 -arylalkyl, or
R 3 is C 3 –C 9 -cycloalkyl which may be substituted by C 1 –C 20 -alkyl, C 1 C 20 haloalkyl, C 1 –C 10 -alkoxy, C 6 –C 40 -haloaryl, C 7 –C 40 -alkylaryl, C 7 –C 40 -arylalkyl, C 7 –C 40 -haloarylalkyl or C 7 –C 40 -haloalkylaryl, and
R 4 is a hydrogen atom.
5. A catalyst system as claimed in claim 4 , wherein at least one metallocene compound is used as the organometallic transition metal compound.
6. The catalyst system defined in claim 4 , wherein R 3 is C 3 –C 9 -cycloalkyl or C 7 -arylalkyl.
7. The catalyst system defined in claim 4 , wherein R 3 is C 7 –C 20 -arylalkyl.
8. The catalyst system defined in claim 7 , wherein R 3 is C 7 -arylalkyl.
9. The catalyst system defined in claim 4 , wherein at least one compound of formula I is selected from the group consisting of:
N,N-dimethylcyclohexylammonium tetrakis(pentafluorophenyl)borate,
N,N-diethylcyclohexylammonium tetrakis(pentafluorophenyl)borate,
N,N-diisopropylcyclohexylammonium tetrakis(pentafluorophenyl)borate,
N,N-diethylbenzylammonium tetrakis(pentafluorophenyl)borate,
N,N-diisopropylbenzylammonium tetrakis(pentafluorophenyl)borate, and
N,N-dimethylbenzylammonium tetrakis(pentafluorophenyl)borate.
10. The catalyst system defined in claim 4 , wherein at least one compound of formula I is selected from the group consisting of:
N,N-diethylbenzylammonium tetrakis(pentafluorophenyl)borate,
N,N-diisopropylbenzylammonium tetrakis(pentafluorophenyl)borate and
N,N-dimethylbenzylammonium tetrakis(pentafluorophenyl)borate.
11. The catalyst system defined in claim 4 , wherein R 20 of formula (IV) are identical or different and are each C 1 –C 6 -alkyl groups.
12. The catalyst system defined in claim 11 , wherein R 20 of formula (IV) are identical or different and are each C 1 –C 4 -alkyl groups.
13. A process for preparing a polyolefin which comprises polymerizing of one or more olefins in the presence of a catalyst system as claimed in claim 4 .
14. A process for preparing a polyolefin which comprises polymerizing one or more olefins in the presence of a catalyst system as claimed in claim 7 .