Abstract:
The present invention provides a crystalline polyester resin which has sharp melt property, can achieve both fixing performance and blocking property and has excellent development durability, in which the crystalline polyester resin for toner which has a Young's modulus as measured by an ultramicro durometer at 25 °C of at least 2 GPa and a melting point of at least 60 °C and not more than 125 °C.
Abstract:
The method for manufacturing core-shell structure fine particles, includes adding metal salt into an aqueous medium containing shell particles A and core particles B to thereby attach the shell particles A to the surface of each of the core particles B and the toner contains the core-shell structure fine particles. (1) The zeta potential of the core particles B and the zeta potential of the shell particles A are the same polarity. (2) |Zeta potential of the core particles B when adding metal salt| (Median diameter based on the volume of the shell particles A).
Abstract:
A method for producing a toner includes a step (1) of forming resin microparticles in an aqueous medium in the presence of a surfactant, a step (2) of aggregating the resin microparticles to form aggregated particles, and a step (3) of heating and the aggregated particles and allowing the aggregated particles to coalesce to form toner particles, in which a resin component in the resin microparticles contains an olefinic copolymer and resin A, the resin A has an acid value of 1 mgKOH/g or more and 50 mgKOH/g or less, the resin A has a SP value of 19.0 (J/cm 3 ) 0.5 or more and 21.0 (J/cm 3 ) 0.5 or less, and the resin component has an olefinic copolymer content of 50% by mass or more with respect to the total mass of the resin component.
Abstract translation:调色剂的制造方法包括在表面活性剂的存在下在水性介质中形成树脂微粒的工序(1),将树脂微粒聚集形成凝集粒子的工序(2)和加热步骤(3) 和聚集的颗粒并使聚集的颗粒聚结形成调色剂颗粒,其中树脂微粒中的树脂组分含有烯属共聚物和树脂A,树脂A的酸值为1mgKOH / g以上至50mgKOH / g以下,树脂A的SP值为19.0(J / cm 3)以上且21.0(J / cm 3)以下为0.5以下,树脂成分的烯烃共聚物含量为50质量%以上, 相对于树脂成分的总质量。
Abstract:
The present invention provides a crystalline polyester resin having a sharp melt property that realizes both fixing performance and blocking property and demonstrates favorable charging performance, in which the crystalline polyester resin for toner, satisfying the following relationships,25 ≤ Tg ≤ 70, and (Tg+273)/(Mp+273) ≥ 0.75, wherein Tg (°C) represents a glass transition temperature of the crystalline polyester resin for toner, and Mp (°C) represents a melting point of the crystalline polyester resin for toner.
Abstract:
Provided is a toner that achieves low-temperature fixability, storability and charging performance all at a high level, in which a toner containing a crystalline resin and an amorphous resin, wherein a standard deviation of hydrogen nuclear relaxation times (HT1ρ-C) of the toner as measured by solid-state 13 C-NMR is from 0.0 to 5.0, and a hydrogen nuclear relaxation time (HT1ρ-C1) of a 13 C peak with the longest relaxation time out of the hydrogen nuclear relaxation times (HT1ρ-C) and a hydrogen nuclear relaxation time (HT1ρ-A1) of a 13 C peak with the shortest relaxation time out of the hydrogen nuclear relaxation times (HT1ρ-A) satisfy 3.0 ≤ { (HT1ρ-C1) / (HT1ρ-A1) } ≤ 6.0.
Abstract:
The toner production method of the present invention is a method of producing a toner that has a toner particle that contains a crystalline resin and an amorphous resin compatible with the crystalline resin, wherein an aggregation step of obtaining aggregate particles by mixing an amorphous resin microparticle dispersion with a crystalline resin microparticle dispersion, and carrying out an aggregation in which microparticless including the amorphous resin microparticles and the crystalline resin microparticles are aggregated; and a fusion step of carrying out a fusion treatment on the aggregate particles by adding, at a specific temperature, an organic solvent that is a good solvent for the amorphous resin and a poor solvent for the crystalline resin.
Abstract:
An object of the present invention is to provide a toner that exhibits high levels of the low-temperature fixability, storability, and charging performance all at the same time. The toner of the present invention is a toner that has a toner particle comprising a crystalline resin and an amorphous resin, the toner being characterized in that the toner satisfies 0.00 ≤ (Wt2/Wt1) ≤ 0.50; the toner particle has a matrix- domain structure in which domains of the crystalline resin are present in a matrix of the amorphous resin; at least 90 number% of the crystalline resin domains are domains with a diameter from 0.05 μm to 0.50 μm; and SF1 for the crystalline resin domains is from 100 to 130.
Abstract:
Provided is a method for manufacturing a toner having both low-temperature fixability and storability as well as good charging performance by thoroughly phase separating a crystalline resin and an amorphous resin in the toner while uniformly dispersing the crystalline resin in the form of minute domains, in which a method for manufacturing a toner containing a crystalline resin and an amorphous resin compatible with the crystalline resin includes a compatibilization step of compatibilizing the crystalline resin and the amorphous resin to obtain a compatibilized blend, and a solvent treatment step of treating the compatibilized blend with an organic solvent, wherein the organic solvent is a good solvent for the amorphous resin and a poor solvent for the crystalline resin.
Abstract:
Disclosed is a process for producing a toner, having an agglomeration step of agglomerating first resin particles and colorant particles in an aqueous medium to form an agglomerate; a primary fusion step of heating a water base dispersion of the agglomerate at an extrapolated glass transition end temperature of the first resin or more to fuse the agglomerate to obtain a water base dispersion of core particles; a cooling step of the water base dispersion of the core particles to a temperature lower than Tig1; an adhering step of mixing at a temperature lower than Tig1 a water base dispersion of second resin particles with the water base dispersion of the core particles to obtain a water base dispersion of the shell-adherent substance; and a secondary fusion step of heating the water base dispersion of the shell-adherent substance at Teg1 or more to obtain toner particles.
Abstract:
A process for producing a core-shell toner is provided in which the toner has core particles containing at least a binder resin (1), a colorant and a release agent and shell layers which contain at least a resin (2) and with which the core particles are covered; and the process including the steps of (A) mixing a binder resin-(1) dispersion, a colorant dispersion and a release agent dispersion, (B) adding to a mixed dispersion thus obtained an agglomerating agent to effect agglomeration, (C) adding to core agglomerated particles thus formed a mixture prepared by mixing the resin-(2) dispersion and a metal salt to make the resin (2) adhere to the surfaces of the core agglomerated particles, and (D) heating core-shell agglomerated particles thus formed to a temperature not lower than the glass transition temperatures of the binder resin (1) and resin (2) to effect fusion thereof.