| abstract |
(57) [Summary] [Purpose] Under various reaction conditions, the Mw / Mn value is small, To provide a method for obtaining an isobutylene-based polymer having a small amount of by-products. [Structure] The following ingredients or further ingredients are -100 A method for producing an isobutylene-based polymer having an unsaturated group, which is mixed at a temperature of 0 ° C or higher and 0 ° C or lower. A cationically polymerizable monomer containing isobutylene, represented by the general formula (1) [in the formula, R 1 is an aromatic ring group or a substituted or unsubstituted aliphatic hydrocarbon group. R 2 and R 3 are H or a substituted or unsubstituted monovalent hydrocarbon group. However, when R 1 is an aliphatic hydrocarbon group, R 2 and R 3 are not H at the same time. In the formula, X is a halogen atom, R 4 COO-group (R 4 is H or 1 to 5 carbon atoms). Or an R 5 O— group (R 5 is H or an alkyl group having 1 to 5 carbon atoms). n is 1-8], the general formula (2): CH 2 = CH- (Q) -CH = CH 2 wherein Q is a hydrocarbon group having 1 to 30 carbon atoms. ], Lewis acid, An electron donor component having a donor number of 15 to 50, a component accelerating the Friedel-Crafts type addition reaction at the polymer end |