JP2011033959A5

JP2011033959A5 -

Info

Publication number: JP2011033959A5
Application number: JP2009182041A
Authority: JP
Filing date: 2009-08-05
Publication date: 2013-10-31
Anticipated expiration: 2029-08-05

Description

近年、複写機やプリンターの高画質化・高精細化に伴い、現像剤としてのトナーに要求される性能も一段と厳しくなっている。トナーとしては、粒子径は小さく（具体的には、重量平均粒径（Ｄ４）６．０μｍ以下）、且つ、４μｍ以下の微粉体、その中でも特に２μｍ以下の超微粉体の少ないシャープなものが必要とされている。 In recent years, with the demand for higher image quality and higher definition of copying machines and printers, the performance required for toner as a developer has become more severe. The toner (specifically, less weight-average particle diameter (D4) 6.0 .mu.m) particle size is small, and, following fine powder 4 [mu] m, less sharp ones of ultrafine powders in particular following 2μm Among them Is needed.

しかしながら、ジェット気流式粉砕機では、重量平均粒径（Ｄ４）６．０μｍ以下の小粒径トナー粒子を生産するためには多量のエアーを必要とする。そのため電力消費が極めて多く、エネルギーコストという面において問題を抱えている。また、重量平均粒径６．０μｍ以下のトナー粒子を得ようとすると、発生する微粉体や超微粉体の量が多くなり、後工程の分級工程において分級収率の低下を招き、トナー生産性上好ましくない。 However, a jet airflow pulverizer requires a large amount of air in order to produce small-diameter toner particles having a weight average particle diameter (D4) of 6.0 μm or less. Therefore, power consumption is extremely large, and there is a problem in terms of energy cost. Further, in order to obtain a less toner particle weight average particle diameter of 6.0 .mu.m, the amount of the fine powder and ultrafine powder generated is increased, leading to reduction in classification yield in classification step in a subsequent step, the toner production It is not preferable in nature.

本発明によれば、小粒径で、且つ、２μｍ以下の超微粉体が少ないトナー粒子を、効率良く、安定的に、トナー生産性良く得ることができる。 According to the present invention, a small particle diameter, and, the following ultrafine powder is small toner particles 2 [mu] m, efficiently, stably, it is possible to obtain toner with good productivity.

Claims

At least a melt-kneading step of melt-kneading a mixture containing at least a binder resin and a colorant, a pulverizing step of pulverizing the obtained kneaded material by a pulverizing means, and a classification step of classifying a finely pulverized product obtained by the pulverizing step In the method for producing toner particles ,
Pulverizer used as pulverizng means includes a rotor attached to the centered rotation axis, and a stator disposed around said rotor, said stator surface and the rotor surface are both and have a plurality of protrusions and recesses,
When pulverization is performed in the pulverizer, the powder raw material passes through a region cooled to −40 ° C. or more and 0 ° C. or less by the cold air supplied from the cold air generating means , and the cooling time T [ sec] to be conveyed to the powder inlet of the pulverizer by high-pressure gas,
When the pressure P [MPa] of the high-pressure gas is 0.3 [ MPa ] ≦ P, and the peripheral speed of the rotor during pulverization is R [m / sec], the following formulas (1) and (2) A method for producing toner particles, wherein:
75 [m] ≦ R [m / sec] × T [sec] (1)
100 ≦ R [m / sec] ≦ 175 (2)

2. The toner according to claim 1, wherein the pulverizer includes the concavo-convex portion provided in parallel to the central rotation axis, and the rotor includes a cooling coolant channel therein. Particle manufacturing method.

The binder resin contained in the toner particles is a hybrid resin containing at least a polyester resin component,
The peak molecular weight Mp in the gel permeation chromatography (GPC) of the tetrahydrofuran (THF) soluble component of the toner particles is 4,000 to 9,000, and the weight average molecular weight Mw (Mw / Mn) relative to the number average molecular weight Mn is The method for producing toner particles according to claim 1, wherein the toner particles have a particle size of 300 to 5,000.