Patent ID: 7998648

Claim:
An electrophotographic developing agent comprising a binder resin, a releasing agent, a colorant, and a charge control agent, wherein the binder resin is a polyester resin having an acid value of 20 mg-KOH/g or greater and the releasing agent is a mixture of a low melting point wax and a high melting point wax, the low melting point wax having a melting point lower than a softening point of the binder resin (T 1/2 ), a melting point of about 60 to 110° C. and an acid value less than 1 mg-KOH/g, the low melting point wax being an ester wax, and the high melting point wax having a melting point higher than the melting point of the low melting point wax and lower than the softening point of the binder resin (T 1/2 ), a melting point of about 80 to 150° C. and acid value of 3 mg-KOH/g or greater.