Production of Highly Reactive Low Molecular Weight PIB Oligomers

摘要

In one preferred embodiment, the present invention provides a process for the liquid phase polymerization of isobutylene to manufacture highly reactive PIB oligomers having Mn under 1000, using a catalyst composition comprising a Friedel-Crafts catalyst a complexing agent, a chain transfer agent and a polymerization-retarding agent. A chain transfer agent may be selected from: α-DIB and β-DIB and mixtures thereof.;;A polymerization-retarding agent may be selected from:;

主权项

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 an olefinic chain transfer agent (“CTA”); d) providing a polymerization-retarding agent; e) introducing said feedstock, said catalyst composition, said chain transfer agent and said polymerization-retarding agent into a reaction zone to form a reaction mixture; f) intimately intermixing the reaction mixture in said reaction zone; g) optionally adding a modifier; h) maintaining the reaction mixture in its intimately intermixed condition to thereby cause the isobutylene therein to undergo polymerization to form polyisobutylene; and i) withdrawing a product stream comprising low molecular weight, highly reactive polyisobutylene from said reaction zone.