Polyolefin production
US6184318A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 18, 1999 |
| Grant date | Feb 6, 2001 |
| Priority date | — |
| Expiry date | Jun 18, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S526/943
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A C.sub.1 symmetric metallocene compound of general formula R"(CpR.sub.n)(Cp'R".sub.m) MQ.sub.p for use as a catalyst component in the production of short sequence syndiotactic/isotactic block polyolefins, wherein Cp is a substituted cyclopentadienyl; each R is independently aryl or hydrocarbyl having 1 to 20 carbon atoms, at least position 3 of Cp is substituted with aryl, at least one other position of Cp is substituted with a non-bulky substituent, and n is an integer in the range from 2 to 4; Cp' is substituted or unsubstituted fluorenyl; each R' is independently hydrocarbyl having 1 to 20 carbon atoms and m is O or an integer in the range from 1 to 8; R" is a structural bridge to impart stereorigidity between Cp and Cp'; M is a metal from Group IIIB, IVB, VB or VIB; Q is a hydrocarbyl radical having 1 to 20 carbon atoms or a halogen; and p is the valence of M minus 2.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.