| 摘要 |
The invention relates to a method for producing highly reactive polyisobuten es containing over 80 mol.% terminal vinylidene groupings and with an average molecular weight of 500 to 5000 Dalton, by cationic polymerisation of isobutene in liquid phase in the presence of a complex consisting of boron trifluoride, at temperatures of +40 ~C to 60 ~C. According to said method, t he polymerisation is carried out in the presence of a complex consisting of bor on trifluoride and a) a primary alcohol with 1 to 20 C-atoms or a secondary alcohol with 3 to 20 C-atoms or a mixture of these alcohols and b) an ether which is free of tertiary alkyl groups, of formula (I) R1-O-R2 wherein R1 an d R2 are primary or secondary alkyl groups with 3 to 10 C-atoms, with the condition that at least one of the groups R1 and R2 is a secondary alkyl gro up.
|
