Styrene → HCID 131715186, compound

Participants

Reaction Steps

Polymerization was conducted in the same manner as in Reference Example 11, except that 50 g of 1,3-butadiene, 75 g of styrene, 300 g of 1,3-butadiene and 75 g of styrene were added in this order. Finally, 50 g of 1,3-butadiene was further added and polymerization was conducted for 30 minutes. The resulting polymer solution was treated in the same manner as in Reference Example 11 to obtain a butadiene-styrene-butadiene-styrene-butadiene block copolymer having a bound styrene content of 30%, a block styrene content of 27% and a 1,2-vinyl content in the butadiene units of 38% (27% based on the weight of the entire block copolymer) and having a number average molecular weight of about 60,000.

Provenance & Evidence