Isoprene → HCID 19842620, compound

Participants

Reaction Steps

In a pressure-resistant container replaced with dry nitrogen, styrene was polymerized at 60° C. using cyclohexane as a solvent and s-butyllithium as a polymerization initiator, TMEDA was added thereto as a Lewis base, and thereafter isoprene and styrene were successively polymerized thereto to give a styrene-isoprene-styrene block copolymer. The resulting block copolymer was hydrogenated in cyclohexane under a hydrogen atmosphere at a hydrogen pressure of 2 MPa using Pd/C as a catalyst, to give a hydrogenated block copolymer (the hydrogenated block copolymer obtained in Preparation Example 4 being hereinafter simply referred to as a block copolymer 4). The content of styrene, the number-average molecular weight, the content of vinyl bonds and the hydrogenation rate of the resulting block copolymer 4 are shown in Table 1.

Provenance & Evidence