Cofeeds of electron donating and electron withdrawing reagents to control MW in olefin polymerization using supported metallocene catalyst
US5883203A · kind A · utility
6Cited by
144References
31Claims
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Key dates
| Filing date | Oct 10, 1997 |
| Grant date | Mar 16, 1999 |
| Priority date | — |
| Expiry date | Oct 10, 2017 |
Classification
- Technology area (CPC —)General
Abstract
In gas phase polymerizations and copolymerizations of ethylene, reagents or cofeeds control the molecular weight, expressed as MI (wherein MI is measured according to ASTM D-1238 Condition E), of the resin product. Use of isopentane and electron donating compounds decrease MI; whereas, electron withdrawing compounds increase MI.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.