Multiple crosslinking type transition metal compound used for olefin polymerization process
US6171994A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 2, 1998 |
| Grant date | Jan 9, 2001 |
| Priority date | — |
| Expiry date | Nov 2, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S526/943
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A novel multiply crosslinked transition metal compound represented by the formula (I): ##STR1## wherein M is a metallic element of the Groups 3 to 10 or the lanthanide series of the Periodic Table; E.sup.1 and E.sup.2 are each a .sigma.-bonding or .pi.-bonding ligand; X is a .sigma.-bonding ligand; Y is a Lewis base; A.sup.1, A.sup.2, . . . A.sup.n and D are each a crosslinking group, and at least one of A.sup.1, A.sup.2, . . . A.sup.n comprises a crosslink consisting of carbon alone; n is 2 to 4; p is 1 to 4; q is 1 to 5 and equal to the valence of M minus 2; r is 0 to 3; and s is 0 to 4, and a production process thereof. The transition metal compound is useful as a component of a polymerization catalyst for catalyzing the production of an olefin polymer having a uniform composition and a narrow molecular weight distribution in a high yield.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.