Patent ID: 8524843
Filing Date: 2013-09-03
Classification: C08F

Abstract:
1. A liquid phase polymerization process of isobutylene to manufacture highly reactive polyisobutylene (PIB) having Mn under 1000 and at least 70% terminal double bonds, said process comprising: a) providing a feedstock comprising isobutylene; b) providing a catalyst composition comprising a Friedel-Crafts catalyst and a complexing agent therefor; c) providing a CTA (chain transfer agent) selected from the group consisting of 2,4,4-trimethyl-1-pentene (α-DIB), 2,4,4-trimethyl-2-pentene (β-DIB), 2-ethyl-1-hexene, 2-methyl-1-pentene and mixtures thereof; d) introducing said feedstock, said catalyst composition and said chain transfer agent into a reaction zone to form a reaction mixture; e) intimately intermixing the reaction mixture in said reaction zone; f) optionally adding a modifier; g) maintaining the reaction mixture in its intimately intermixed condition and keeping it at a temperature of about 20-110° F. in the reaction zone, to thereby cause the isobutylene therein to undergo polymerization to form polyisobutylene; h) withdrawing a product stream comprising low molecular weight, highly reactive polyisobutylene from said reaction zone; and optionally i) controlling the introduction of said feedstock into said reaction zone and the withdrawal of said product stream from the reaction zone such that the residence time of the isobutylene undergoing polymerization in the reaction zone is no greater than about 4 minutes.