| 摘要 |
A relatively low molecular weight, mid-range vinylidene content PIB polymer product and a process for making the same. 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, preferably less than about 5 % and ideally less than about 1-2 %. The mid- range vinylidene content PIB polymer products are prepared by a liquid phase polymerization process conducted in a loop reactor (10, 100) at a temperature of at least 60 ~F using a BF3/methanol catalyst complex and a contact time of no more than 4 minutes.
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