Back to results
US 5,329,031 AGranted
Metallocene and process for producing polyolefin using the same
AssigneeShowa Denko K.K.
InventorsShigenobu Miyake, Nobuyuki Kibino, Takashi Monoi, Hiroyuki Ohira, Shintaro Inazawa
Life of this patent
Estimating the term…
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.
Claims7
A metallocene represented by formula (I) and 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.
3 more elements
Dependencies are inferred from the claim text.