Isoprene → HCID 19842620, compound

Participants

Reaction Steps

Into a reaction vessel with a stirrer, 50 kg of cyclohexane, 1,750 g of well dehydrated styrene and 175 g of sec-butyl lithium (10% by weight, cyclohexane solution) were charged to carry out polymerization at 60° C. for 60 minutes. Next, 6,500 g of isoprene was added to carry out polymerization for 60 minutes, and 1,750 g of styrene was further added to carry out polymerization for 60 minutes. Thereafter, methanol was added to terminate the reaction. Thus, a styrene-isoprene-styrene type block copolymer was obtained. The block copolymer obtained was subjected to hydrogenation under the same conditions as in Reference Example 1 to give a hydrogenated product of the block copolymer (hereinafter simply referred to as "SEPS-1"). The SEPS-1 thus obtained had a number average molecular weight of 53,000 and a styrene content of 35% by weight, where the ratio of hydrogenation was 98.9%.

Provenance & Evidence