Process for producing polyisobutenes
AssigneeBP Chemicals Limited
InventorChristopher R. Marsh
Life of this patent
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Abstract
High molecular weight polybutenes having a viscosity SSU above 1,000,000 at 210.degree. F. are produced by using a three-component catalyst system containing an alkyl aluminium halide, tertiary butyl halide and a metal halide selected from SnCl.sub.4, SnBr.sub.4, TiCl.sub.4, and TiBr.sub.4. The reaction phase is homogeneous and the catalyst components are added as a solution in an inert solvent. The polyisobutene product so produced are useful additives for oil, adhesives and mastics.
Claims1
A homogeneous polymerization process for producing high molecular weight polyisobutenes of SSU viscosity above 1,000,000 at 210.degree. F. by polymerizing a C.sub.4 feedstock comprising isobutene at a temperature of from -5.degree. to -25.degree. C. in the presence of a catalyst system comprising (i) an alkyl aluminum dichloride or dibromide, (ii) tertiary butyl chloride or bromide, and (iii) a metal halide selected from the group consisting of SnCl.sub.4, SnBr.sub.4, TiCl.sub.4, and TiBr.sub.4, and said catalyst concentration based on said alkyl aluminum dichloride or dibromide content thereof is from 20 to 2000 ppm based on the weight of said C.sub.4 feedstock and said catalyst components are present in equimolar proportions.
Dependencies are inferred from the claim text.