US 2022/0025076 A1 · Polymerization Catalyst System and Process to Produce Highly Reactive Polyisobutylene

Abstract

The present invention provides a method for producing highly reactive polyisobutylene by liquid phase polymerization of isobutylene or isobutylene containing feed stock, wherein at least 70 mole % of polymer chains in the polyisobutylene have exo olefin end groups. Further, the present invention provides a catalyst composition for polymerization, comprising of a Lewis acid complexed with at least two Lewis bases selected from sterically hindered ether and linear dialkyl ether; or a Lewis base complexed with at least two Lewis acids selected from aluminium halides mixture. The present invention additionally provides that Lewis acid with Lewis bases mixture or Lewis base with Lewis acids mixture constituting the catalyst show synergistic effect resulting in high isobutylene conversion and production of polyisobutylene having high exo olefin content, while maintaining desired molecular weight range of 250-10000 Dalton.

Claims20

Dependent claims

A polymerization catalyst system for liquid phase polymerization of isobutylene or an isobutylene containing feed stock for producing highly reactive polyisobutylene, the catalyst system comprising:

one or more Lewis acids,
one or more Lewis bases, and
optionally one or more initiators,
wherein the catalyst system is a complex of a Lewis acid with a mixture of Lewis bases, or a complex of a Lewis base with a mixture of Lewis acids;
and
wherein the polyisobutylene comprises homo or copolymers of isobutylene with at least 70 mole % of polymer chains in the polyisobutylene having exo olefin end groups.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application

17/382,138Filed 21 Jul 2021

Priority

IN 20202103132222 Jul 2020

Published

27 Jan 2022

Term ends

Not estimatedThe source records don’t support an estimate.

Classification7 codes

C08F 4/14
Of boron, aluminium, gallium, indium, thallium or rare earths: boron halides or aluminium halides; Complexes thereof with organic compounds…
C08F 110/10
Butenes: isobutene
C08F 2/01
Processes of polymerisation: characterised by special features of the polymerisation apparatus used
C08F 2/06
Polymerisation in solution: organic solvent

Polymerization Catalyst System and Process to Produce Highly Reactive Polyisobutylene

Life of this patent

Polymerization Catalyst System and Process to Produce Highly Reactive Polyisobutylene

Life of this patent

Abstract

Claims20