Styrene → Benzene, ethenyl-, polymer with 1,3-butadiene

Participants

Reaction Steps

5,000 g of cyclohexane, 0.25 g of tetrahydrofuran, 700 g of 1,3-butadiene, 300 g of styrene and 0.9 g of n-BuLi were added to a reactor having an inner volume of 10 L replaced with nitrogen, and adiabatic polymerization was performed at initiation temperature of 40° C. to obtain a butadiene/styrene random copolymer. An aliquot of the butadiene/styrene random copolymer sampling had a 1,2-bond of 47%, the styrene bound content of 30.1% and a weight-average molecular weight measured with GPC of about 160 thousands. When 2.8 g of methyltriphenoxysilane was added to the system containing the butadiene/styrene random copolymer, yellow red color of living anion disappeared. Further, it was reacted for 30 minutes as it was. Then, according to the same manner as that of Example 33, a hydrogenating reaction was performed to obtain a hydrogenated modified random copolymer. The resulting hydrogenated modified random copolymer had a hydrogenation rate of 97%, a weight-average molecular weight of about 190 thousands, a coupling rate of 29.5° C., and MFR measured at 230° C. and a load of 2.16 kg of 7.4 g/10 min. In addition, a modified rate obtained by the same manner as that for Example 33 was 0.98/polymer.

Provenance & Evidence