Isoprene → HCID 19842620, compound

Participants

Reaction Steps

A pressure-proof vessel equipped with a stirrer was charged with 3,000 g of cyclohexane, 50 g of sufficiently dewatered styrene and 0.01 mole of lithium sec-butyl and polymerization was effected at 60° C. for 60 minutes. Thereafter, 200 g of isoprene was added and polymerization was effected for 60 minutes, and then 50 g of styrene was added and polymerization was effected for 60 minutes, to obtain a styrene-isoprene-styrene block copolymer. The block copolymer thus obtained had a styrene content of 33% and a number average molecular weight of 35,000. To the polymer solution, a palladium catalyst was added in an amount of 1% by weight/polymer and hydrogenation was conducted under an atmosphere of 50 kg/cm2 of hydrogen, to obtain a block copolymer with hydrogenation ratio of 90%. This was named SEPS-1.

Provenance & Evidence