Patent ID: 9617366
Date: 2017-04-11
CPC Classifications: C08F

Claim:
1. A method of making a low-fluoride reactive PIB composition comprising: (a) providing an isobutylene-enriched C4 feedstock by way of blending a first mixed C4 feedstock having an LB/IsoB index of greater than 3% with a second feedstock having a lower LB/IsoB index, thereby upgrading the feed to the reactor to higher isobutylene content through blending; (b) feeding the isobutylene-enriched C4 feedstock to a polymerization reactor with a catalyst complex comprising BF (c) polymerizing the isobutylene-enriched C4 feedstock in the reactor while maintaining the reactor at a temperature above −40° C. and utilizing a residence time less than 45 minutes to produce a crude PIB composition in a polymerization mixture; and (d) recovering a purified PIB composition from the polymerization mixture having a molecular weight, Mn, from 250 to 5000 Daltons, and an alpha vinylidene content of at least 50 mol %.