Ethylbenzene → Prop-2-enenitrile--ethenylbenzene (1/1)

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Fifty grams of PPO ([η]=0.49, chloroform, 25° C.), 50 g of ethylbenzene, 70 g of styrene, 30 g of acrylonitrile and 1.5 g of di-tertiary-butyl peroxide were charged into a 500 cc autoclave, and stirred at 60° C. to achieve uniform dissolution, after which the inside of the autoclave was displaced with nitrogen gas. The temperature of the reaction vessel was controlled to 140° C., and graft polymerization was effected for 2.5 hours. After completion of the reaction, the contents were withdrawn, and dissolved in 3500 ml of toluene by heating. Thereafter, methanol in an amount 10 times that of toluene was added thereto to obtain a resin powder. This powder was washed with methanol and then with methyl ethyl ketone as described in Example 1 to obtain a purified acrylonitrile-styrene grafted PPO. As the result of the organic elemental microanalysis, the degree of grafting was found 71% and the acrylonitrile content in this acrylonitrile-styrene copolymer graft side-chains was found to be 27%. Two grams of this acrylonitrile-styrene grafted PPO was dissolved in 40 ml of methylene chloride, placed in a stoppered Erlenmeyer flask, and allowed to stand in a constant temperature chamber at 23° C. Observation after 48 hours revealed that this solution was opaque. This solution was filtered to obtain a precipitate, which was dried and weighed to yield 1.26 g. In other words, 63% of the resin was recovered as the precipitate.

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