JP2007178718A5 - - Google Patents

Claims (10)

A coarse pulverization step for obtaining a coarse pulverized product by melt-kneading a composition containing at least a binder resin and a colorant, cooling and solidifying the obtained kneaded product, and coarsely pulverizing the cooled solidified product, and the obtained coarse pulverized product In a method for producing a toner having a fine pulverization step of pulverizing the toner to obtain a finely pulverized product having a weight average particle diameter of 3 to 8 μm,
The fine pulverization step is performed using a mechanical pulverizer, and the mechanical pulverizer includes at least a stator and a rotor attached to a central rotating shaft, and the stator removes the rotor. The rotor is arranged so as to have a predetermined gap between the surface of the stator and the surface of the rotor to form a pulverization zone, and in the pulverization zone, the rotor rotates. The coarsely pulverized product is pulverized,
The outer peripheral surface of the rotor of the mechanical pulverizer and the inner peripheral surface of the stator have a plurality of convex portions and concave portions formed between the convex portions and the convex portions,
When the repetition distance between the convex part and the convex part of the rotor of the mechanical pulverizer is Ra, and the repetition distance between the convex part and the convex part of the stator is La,
Set the rotor and stator configurations so that there is a range where Ra and La are different,
A method for producing a toner, characterized in that, in the rotor of the mechanical pulverizer, the configuration of the rotor is set so that there is a range in which the repetition distance Ra between the convex portion and the convex portion is different. The stator of the mechanical pulverizer has a repetition distance La between the convex portion and the convex portion of less than 3.5 mm,
When the zone where the repetition distance Ra between the projections of the rotor is 3.5 mm or more is LRa, and the zone where the repetition distance Ra between the projections and the projection is less than 3.5 mm is SRa The toner production method according to claim 1, wherein LRa / SRa is 0.1 or more and 7.0 or less.   3. The toner production method according to claim 1, wherein the binder resin used for the toner particles is a resin having at least a polyester unit.   4. A baffle plate ring is provided on a stator of the mechanical pulverizer, and a distance between the baffle plate ring and the rotor is 0.3 mm or more and 0.8 mm or less. 2. A method for producing the toner according to 1.   There is an intermediate pulverization step before the fine pulverization step, the intermediate pulverization step is performed at least using a mechanical pulverizer, and the weight average particle size of the obtained intermediate pulverized product is 50 to 500 μm. The method for producing a toner according to any one of claims 1 to 4. The rotor of the mechanical pulverizer used in the intermediate pulverization step and the rotor of the mechanical pulverizer used in the fine pulverization step are configured so that the refrigerant is supplied from the outside to the inside of the rotary shaft from the rotor joint at the end of the rotor shaft. 6. The refrigerant circulation according to claim 5, further comprising: a refrigerant circulation which is introduced from the end rotor through the refrigerant passage and is removed from heat and then returned to the refrigerant passage of the rotating shaft from the opposite end rotor. Toner manufacturing method.   There is a classification step for classifying the coarse particles of the finely pulverized product obtained by the mechanical pulverizer used in the fine pulverization step after the fine pulverization step, and the coarse particles are returned to the pulverization step. The toner manufacturing method according to claim 1, wherein the toner manufacturing method is a system. 8. The method according to claim 7, further comprising a surface modification step for obtaining surface modified particles by modifying the surface of the obtained toner particles in a step subsequent to the fine pulverization step or a step subsequent to the classification step. Toner production method. The surface modification step is performed using a batch type surface modification device, and the batch type surface modification device has a classification means for continuously discharging and removing at least fine powder having a predetermined particle size or less from the device. When a surface modification means using a mechanical impact force, to have a guide means you bisects the space between the classifying means and the surface modification means into a first space and the second space The method for producing a toner according to claim 8 , wherein the toner is a toner. In the batch type surface modification device, when obtaining the surface modified particles, the toner particles are introduced into the first space, and fine particles having a predetermined particle diameter or less are continuously discharged and removed by the classification means to the outside of the device. via the second space, performs surface modification treatment is introduced into the surface modifying means using a mechanical impact force, by circulating back to the first space, a fixed time, classification and surface modification method for producing a toner according to claim 9, characterized that you repeat the quality process.