(57) A resin useful for preparing an electrophotographic toner, comprising particles of a double layer structure composed of (A) a layer of a low-temperature melting emulsion polymer having a 4 mm descending temperature of 90 to 130°C and (B) a layer of a high-temperature melting emulsion polymer having a 4 mm descending temperature of 130 to 170°C, said particles of the resin having a 4 mm descending temperature of 100 to 150°C. The 4 mm descending temperature is defined as the temperature at which the plunger of a flow tester descends 4 mm in a referential test set forth in JIS K-7210 under conditions involving a die diameter of 1 mm, a die length of 10 mm, a load of 100 kg/cm² and a temperature raising rate of 6°C.