Doubly-conformationally locked, stereorigid catalysts for the preparation of tactiospecific polymers
US5459117A · kind A · utility
64Cited by
23References
22Claims
0Family size
Inventor
Key dates
| Filing date | Aug 27, 1993 |
| Grant date | Oct 17, 1995 |
| Priority date | — |
| Expiry date | Aug 27, 2013 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F110/06
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Isospecific and/or syndiospecific catalysts and processes for the propagation or an isotactic and/or syndiotactic polymer chain derived from an ethylenically unsaturated monomer which contains 3 or more carbon atoms or is a substituted vinyl compound. The catalysts comprise a double-conformationally locked metallocene and/or metallocene cation catalysts, characterized by having sterically dissimilar substituents such that the catalysts have overall either C.sub.s or C.sub.2 (or pseudo-C.sub.s or C.sub.2) symmetrically distributed. Methods are also described for the preparation and use of these unique catalysts.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.