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After the completion of the polymerization, 250 ml of isobutyl alcohol and 10 ml of aqueous hydrochloric acid were added to the mixture and heated at 80° C. for 30 min under agitation. The obtained reaction mixture containing isobutyl alcohol was transferred to a separating funnel, washed with 250 ml of water twice and separated into an oil phase and a water phase. The oil phase was poured into 3 lit. of methanol to thereby precipitate a polymer. The precipitated and separated polymer was dried in vacuum at 130° C. for 12 hr, thereby obtaining 20 g of a polymer having an ethylene content of 86.5 mol % and a styrene content of 13.5 mol % (copolymer (d)). This copolymer (d) exhibited an intrinsic viscosity [η] of 1.1 dl/g which was measured in 135° C. decalin and a melting point (Tm) of 53° C. which was measured by a differential scanning calorimeter.

1. customwas measured in 135° C.
2. customa melting point (Tm) of 53° C. which