Abstract: A method of producing a toner having a process of mixing colored particles and outer-additives by using a mixer with an agitating blade whose shaft portion is sealed with a gas having a flow rate of from 0.4 m3/hr to 3 m3/hr and which rotates at such a high speed as a peripheral speed at a tip of said agitating blade in a range of from 20 m/sec to 50 m/sec. When the colored particles and outer-additives are mixed with each other, there is no generation of aggregates thereby and the toner can be obtained at a high yield. Therefore the toner which hardly generates a white streak and fog, even after a long period of continuous operation of development of electrophotographs is performed, can be obtained.

Abstract: Intermediate polyester fibre and method for the production thereof, characterized in that highly oriented undrawn polyester yarn with a degree of crystallinity in a specified range is passed under a tension of 0.3×10−2 g/d to 5.0×10−2 g/d through a non-contact heater of heater temperature at least 250° C., and 5-40% shrinkage effected, giving the following properties (A): (1) Specific gravity 1.335-1.360 (g/cm3), (2) Degree of crystallinity 21-26%, (3) Crystal size in terms of Miller index (010) 1.4-2.2 nm, in terms of Miller index (100) 1.4-2.5 nm and in terms of Miller index (105) 1.6-3.5, (4) Degree of crystal orientation no more than 75% in the 010 plane and no more than 85% in the 105 plane, and (5) Degree of amorphous orientation 0.15-0.

Abstract: A method of producing a toner having a process of mixing colored particles and outer-additives by using a mixer with an agitating blade whose shaft portion is sealed with a gas having a flow rate of from 0.4 m3/hr to 3 m3/hr and which rotates at such a high speed as a peripheral speed at a tip of said agitating blade in a range of from 20 m/sec to 50 m/sec. When the colored particles and outer-additives are mixed with each other, there is no generation of aggregates thereby and the toner can be obtained at a high yield. Therefore the toner which hardly generates a white streak and fog, even after a long period of continuous operation of development of electrophotographs is performed, can be obtained.