Mid-range vinylidene content polyisobutylene polymer product produced by liquid phase polymerization process
US7498396B2 · kind B2 · utility
11Cited by
78References
4Claims
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Key dates
| Filing date | Nov 17, 2005 |
| Grant date | Mar 3, 2009 |
| Priority date | — |
| Expiry date | Oct 30, 2026 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S525/911
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A mid-range vinylidene content PIB polymer composition made by a liquid phase polymerization process conducted in a loop reactor at a temperature of at least 60° F. using a BF3/methanol catalyst complex and a contact time of no more than 4 minutes. At least about 90% of the PIB molecules present in the product comprise alpha or beta position isomers. The vinylidene (alpha) isomer content of the product may range from 20% to 70% thereof, and the content of tetra-substituted internal double bonds is very low, advantageously no more than about 10%, preferably less than about 5% and ideally less than about 1-2%.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.