Styrene → Isobutylene styrene

Participants

Reaction Steps

The polymerizable monomer component and polymerization initiator were charged into the storage tank 21, the catalyst was charged into the storage 22, and the electron donor was charged into the storage tank 33, in the respective proportions shown in Table 12. The reaction solution obtained at the outlet of the tubular reactor 26 in the same manner as in Example 1 was once allowed to reside in the cushioning vessel 30, then in the stirring vessel reactor 35, the second polymerizable monomer component styrene was added in an amount of 290 moles per mole of p-DCC and the reaction was carried out batchwise at −65° C. for 3 hours. The reaction solution was admixed with water for catalyst deactivation and washed with water and then the solvent was removed to give an isobutylene-styrene block copolymer. The molecular weight distribution peak (Mp) and distribution (Mw/Mn) of the polymer were determined by the GPC method. The analytical values for the polymer at the outlet of the reactor 26 (150 minutes after the start of the feeding) and the analytical values for the polymer at the outlet of the reactor 35 were as shown in Table 13. The conversion rate of the monomer component on the occasion of feeding the reaction solution from the reactor 25 to the reactor 26 was 65% by weight.

Provenance & Evidence