Method for producing toner
A toner and coagulant technology, which is applied in the field of toner preparation, can solve the problems of bad smell of toner, bad smell of ammonia gas, etc., and achieve excellent image quality, excellent fixability, and narrow particle size distribution Effect
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preparation example Construction
[0035] The method for preparing the toner may further include the steps of washing and drying the coalesced toner particles.
[0036] The method for preparing the toner is described in detail, and can be roughly divided into (A) dispersion liquid preparation process, (B) aggregation process, (C) aggregation curing and coalescence process, and (D) washing and drying process.
[0037] (A) Dispersion preparation process
[0038] The dispersion preparation process can be roughly divided into three parts. That is, preparation of a polyester resin dispersion, preparation of a colorant dispersion, and preparation of a wax dispersion.
[0039] The polyester resin dispersion liquid is prepared by preparing an aqueous phase, preparing an organic phase containing a polyester resin, and then mixing and stirring the polyester resin organic phase in the aqueous phase.
[0040] The water phase includes a polar solvent, a surfactant and a dispersion stabilizer.
[0041] The organic phase i...
Embodiment 1
[0083] (1) Preparation of polyester resin dispersion
[0084] 1) Synthetic polyester resin
[0085] Into a 5 L reactor equipped with a stirrer, thermometer, nitrogen inlet and condenser, 120 g of dimethyl terephthalate, 74 g of dimethyl isophthalate, 160 g of 1,2-propanediol and 6 g of trimellitic acid. Then, dibutyltin oxide was added thereto as a catalyst at a rate of 500 ppm relative to the weight of these monomer mixtures. Then, the temperature was raised to 150° C. while stirring the reactant at a speed of 1 rpm to maintain the reaction for 8 hours. After that, the temperature was raised to 200° C., and the reaction tank was decompressed to remove unreacted substances and reaction by-products. The glass transition temperature (Tg) of the prepared polyester resin was measured to be 63°C (Jade DSC+AS, PerkinElmer). The acid value measured by titration was 12 mg KOH / g. The number average molecular weight measured by gel permeation chromatography (Gelpermeation chromatog...
Embodiment 2 to 3 and comparative example 1 to 3
[0113] The amount of NaOH used in the preparation of polyester resin dispersion, AlCl 3 The dosage, the pH value of the reaction solution in the coagulation step, and the coagulation and curing conditions are shown in Table 1 below, and the toner particles were prepared by the same method as in Example 1 except that.
[0114] The conditions of the aggregation reaction liquid in Table 1 below are represented by ○ when they satisfy Mathematical Formula 1, and by X when they are not satisfied.
[0115] Table 1
[0116]
[0117] NaOH, AlCl in the table 3 The weight % of the feeding amount is based on the solid content in the reaction liquid in the coagulation step.
[0118] The toner particles obtained in the Examples and Comparative Examples were evaluated by the following methods, and the results are shown in Table 2.
[0119] Particle Size Distribution Evaluation of Final Toner Particles
[0120] ◎: d50(v)6.0~7.0μm, GSDp<1.30, GSDv<1.25,
[0121] The percentage of less ...
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