Metallocene and process for producing polyolefin using the same
AssigneeShowa Denko K.K.
InventorsShigenobu Miyake, Nobuyuki Kibino, Takashi Monoi, Hiroyuki Ohira, Shintaro Inazawa
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Abstract
A metallocene having an asymmetric ligand which is represented by the formula below and its enantiomer: ##STR1## and a process for producing a polyolefin using the same as a catalyst component. The metallocene and its enantiomer are particularly effective in the production of highly stereospecific polyolefins.
Claims11
A process for producing a polyolefin comprising using, as a catalyst component, a metallocene represented by formula (I) or its enantiomer:
- ##STR8## wherein M represents a transition metal selected from Ti, Zr, and Hf, X.sup.1 and X.sup.2, which may be the same or different, each represents a hydrogen atom, a hydrocarbon group containing from 1 to 10 carbon atoms, an alkylsilyl group, an arylsilyl group, or a halogen atom;
- R.sup.1, R.sup.2, R.sup.3, R.sup.6, and R.sup.7 each represents a hydrogen atom, a hydrocarbon group containing from 1 to 10 carbon atoms, an alkylsilyl group, or an arylsilyl group, provided that either one of R.sup.1 and R.sup.2 is not a hydrogen atom;
- R.sup.4 and R.sup.5 each represents a hydrocarbon group containing from 1 to 10 carbon atoms, an alkylsilyl group, or an arylsilyl group, or they are connected together to form a ring;
- Y represents a carbon atom, a silicon atom, or a germanium atom;
- and n represents an integer of from 1 to 3.
A process for producing a copolymer of ethylene and an .alpha.-olefin comprising using a solid catalyst obtained by supporting (a) a metallocene represented by formula (I) or its enantiomer:
- ##STR11## wherein M represents a transition metal selected from ti, Zr, and Hf;
- X.sup.1 and X.sup.2, which may be the same or different, each represents a hydrogen atom, a hydrocarbon group containing from 1 to 10 carbon atoms, an alkylsilyl group, an arylsilyl group, or a halogen atom;
- R.sup.1, R.sup.2, R.sup.3, R.sup.6, and R.sup.7 each represents a hydrogen atom, a hydrocarbon group containing from 1 to 10 carbon atoms, an alkylsilyl group, or an arylsilyl group, provided that either one of R.sup.1 and R.sup.2 is not a hydrogen atom;
- R.sup.4 and R.sup.5 each represents a hydrocarbon group containing from 1 to 10 carbon atoms, an alkylsilyl group, or an arylsilyl group, or they are connected together to form a ring;
- Y represents a carbon atom, a silicon atom, or a germanium atom;
- and n represents an integer of from 1 to 3, and (b) an organoaluminumoxy compound on (c) an inorganic oxide carrier in combination with, as a co-catalyst, an organoaluminum compound.
Dependencies are inferred from the claim text.