| 摘要 |
<p>A process is described for preparing polyisobutene having a content of terminal vinylidene groups of at least 75 mol % by polymerizing isobutene or isobutenic hydrocarbon mixtures in the liquid phase in the presence of a boron trifluoride complex catalyst of the composition <?in-line-formulae description="In-line Formulae" end="lead"?>(BF<SUB>3</SUB>)<SUB>a</SUB>.L<SUP>1</SUP><SUB>b</SUB>.L<SUP>2</SUP><SUB>c</SUB>.L<SUP>3</SUP><SUB>d</SUB><?in-line-formulae description="In-line Formulae" end="tail"?> where L<SUP>1 </SUP>is water, a primary C<SUB>1</SUB>-C<SUB>5</SUB>-alkanol and/or a secondary C<SUB>3</SUB>-C<SUB>5</SUB>-alkanol, L<SUP>2 </SUP>is at least one aldehyde and/or one ketone, L<SUP>3 </SUP>is an ether having at least 5 carbon atoms, a secondary alkanol having at least 6 carbon atoms, a primary alkanol having at least 6 carbon atoms and/or a tertiary alkanol, the b:a ratio is in the range from 0.9 to 3.0, the c:a ratio is in the range from 0.01 to 0.5, and the d:a ratio is in the range from 0 to 1.0.</p> |
