摘要:
Provided is a method of manufacturing toner by which the toner capable of forming high quality images and reproducing high density gradation, which exhibits an excellent high-temperature offsetting property together with excellent low-temperature fixability, and provides appropriate gloss with respect to images to be formed, can be stably prepared; and also provided is the toner. After conducting a step in which particles made of at least a crystalline polyester resin are coagulated to form core coagulated particles, and an unsaturated amorphous polyester resin particle is attached onto the surface of each of the core coagulated particles to form core-shell type coagulated particles, radical polymerization reaction is conducted by acting a radical polymerization initiator on the foregoing core-shell type coagulated particles to conduct a step in which a layer made of a crosslinking amorphous polyester resin is formed on the surface of each of the core coagulated particles.
摘要:
A method of producing an electrostatic image developing toner comprising toner particles comprising a binder resin containing at least a non-crystalline polyester resin having a crosslinking structure and a crystalline polyester resin, the method comprising the steps of (a-1) preparing a crystalline polyester resin particle aqueous dispersion liquid; (a-2) preparing a polymerizable unsaturated non-crystalline polyester resin aqueous dispersion liquid; (b) preparing crosslinking non-crystalline polyester resin particles by adding a radical polymerization initiator to the aqueous dispersion liquid of particles containing the non-crystalline polyester resin having a polymerizable unsaturated bond; (c) preparing core particles by aggregating at least the particles containing the crystalline polyester resin in an aqueous medium; and (d) preparing a shell layer containing the non-crystalline polyester resin having a crosslinking structure by fusing the particles containing the non-crystalline polyester resin having a crosslinking structure on surfaces of the core particles in an aqueous medium.
摘要:
A method of producing a toner comprising toner particles containing a binder resin composed of a non-crystalline polyester resin having a crosslinking structure and a crystalline polyester resin is disclosed, the method comparing steps of; a process to form an oil phase liquid by dissolving or dispersing a non-crystalline polyester resin having a polymerizable unsaturated double bond and a crystalline polyester resin in an organic solvent, a process to form an aqueous dispersion liquid of oil droplets of the oil phase liquid by dispersing the oil phase liquid in an aqueous medium, a process to form oil droplets containing the non-crystalline polyester resin having a crosslinking structure by adding a radical polymerization initiator to the aqueous dispersion liquid of oil droplets, and an organic solvent removing process to form toner particles by removing organic solvent.
摘要:
A toner comprising toner particles containing a binder resin comprising a crystalline polyester resin, a non-crystalline polyester resin and an acryl resin having a cross-link structure, and the acryl resin having a cross-link structure has a cross-link site derived from a crosslinking agent represented by the following formula (1): CH2═CR1—C(═O)O—Z—OC(═O)—CR2═CH2 Formula (1) wherein R1 and R2 are each a hydrogen atom or an alkyl group of 1 to 3 carbon atoms, and Z is a hydrocarbon group of 2 to 90 carbon atoms, provided that the hydrocarbon group may include an ether linkage, an ester linkage, a heterocyclic ring or a substituent.
摘要:
Disclosed is a production process of a toner for electrostatic image development, by which excellent toner particle size-controlling ability is achieved, and moreover the sharpening of a particle size distribution is achieved.The production process is a production process of a toner for electrostatic image development, is composed of toner particles containing a binder resin. The process has the steps of adding a aggregating agent containing polysilicato-iron into an aqueous medium in which fine binder resin particles formed of the binder resin have been dispersed, thereby aggregating the fine binder resin particles, and adding an aggregation stopper composed of a salt whose cation is univalent or bivalent.
摘要:
The toner for electrostatic image development has excellent charge properties, by which excellent toner particle size-controlling ability is achieved, and moreover the sharpening of a particle size distribution is achieved. The toner is composed of toner particles containing a binder resin. The process has an aggregating step of adding an aggregating agent containing a transition element into an aqueous medium of dispersed fine binder resin particles to aggregate the fine binder resin particles, and an aggregation-stopping step of adding an aggregation stopper composed on a sulfur atom-containing compound exhibiting a reducing action on the aggregating agent. The aggregating agent is a salt of a bivalent or higher metal selected from Sr, Ti, V, Cr, Mn, Fe, Co, Ni and Cu.
摘要:
A two-component developer is disclosed, composing a toner comprising parent toner particles with an attached external additive and a carrier provided with a resin covering layer on a surface of a core particle, wherein the resin covering layer comprises a binder resin comprising an acrylic resin and when the resin covering layer is divided in half to a core particle side and a surface side, a nitrogen element content of the core particle side is larger than a nitrogen element content of the surface side.
摘要:
Disclosed is a production process of a toner for electrostatic image development, by which excellent toner particle size-controlling ability and moreover the sharpening of a particle size distribution are achieved.The production process is a production process of a toner for electrostatic image development, which is composed of toner particles containing at least a binder resin. The process has an aggregating and fusion-bonding step of adding a aggregating agent containing polysilicato-iron into an aqueous medium in which fine binder resin particles formed of the binder resin have been dispersed, thereby aggregating the fine binder resin particles, and an aggregation stopper-adding step of adding an aggregation stopper composed of a polyvalent organic acid or a salt thereof. In the production process of the toner for electrostatic image development, the polyvalent organic acid or the salt thereof is preferably an amino acid or a salt thereof.
摘要:
A communication terminal includes a memory, an interface, and circuitry. The communication terminal is one of a plurality of communication terminals each of which receives a request for communication start from a source communication terminal. The memory stores identification information of the source terminal in response to the request for communication start. The interface responds to the request for communication start, and receives a request for communication establishment from the source terminal. The request for communication establishment is transmitted from the source terminal when the source terminal selects the communication terminal from the plurality of communication terminals each of which responds to the request for communication start. The circuitry determines whether to respond to the request for communication establishment according to a result of comparison between identification information of the source terminal that sends the request for communication establishment and the identification information stored in the memory.
摘要:
An information processing apparatus is provided for communicating with another information processing apparatus in a different site by using at least one of a plurality of communication platforms. The information processing apparatus includes: a receiving unit configured to receive a transmission image that has been transmitted from the another information processing apparatus in the different site; a displaying unit configured to display on a display device the transmission image that has been received by the receiving unit; and a reading unit configured to read an image to be displayed from an image storing unit configured to store the image to be displayed. For at least a certain period while the one of the communication platform is being switched to another one, the displaying unit displays, in place of the transmission image, the image to be displayed that has been read by the reading unit.