Alpha-Methylstyrene → alpha-Methylstyrene isopropenyltoluene

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A mixture of isopropenyl toluene, α-methyl styrene, and dehydrated and refined toluene (volume ratio=total amount of monomers:toluene=1:1) and boron trifluoride phenolate complex diluted to ten times with dehydrated and refined toluene (1.7 times equivalent as phenol) were continuously fed into an autoclave having an actual capacity of 1270 ml equipped with mixing blades. The polymerization reaction was carried out at the reaction temperature of 5° C. The mol ratio of isopropenyl toluene to α-methyl styrene was 50:50. The feeding rate of the mixture of monomers and toluene was 1.0 liter/hour, and that of the diluted catalyst was 70 milliliters/hour. Next, the reactant mixture was transferred into the second stage autoclave so as to continue polymerization reaction at 5° C. When the total residence time in the first and second stage autoclaves reached two hours, the reactant mixture was discharged continuously. When three times as much time as that of the residence time elapsed, one liter of the reactant mixture was sampled and the polymerization reaction was terminated. After termination of polymerization, one normal NaOH aqueous solution was added to the sampled reactant mixture so as to deash the residual catalyst. The obtained reactant mixture was further washed five times using a large amount of water. Solvent and un-reacted monomers were removed by vacuum distillation in an evaporator to obtain isopropenyl toluene-α-methyl styrene copolymer (1). This isopropenyl toluene-α-methyl styrene copolymer (1) had these properties: softening point Tm=145° C., number average molecular weight Mn=1420, and weight average molecular weight Mw=2430.

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