41results about How to "Excellent offset resistance" patented technology

A toner comprising toner particles, each of which contains a binder resin and a colorant, wherein an onset temperature Te (° C.) of a storage elastic modulus E′ obtained in a powder dynamic viscoelastic measurement on the toner is at least 50° C. and not more than 70° C., and a value at Te (° C.) of a storage elastic modulus G′ obtained in a pellet dynamic viscoelastic measurement on the toner is at least 4.0×107 Pa and not more than 1.0×1010 Pa.

To provide an image forming method including forming a latent electrostatic image on a latent electrostatic image bearing member, developing the latent electrostatic image using a toner to form a visible image, transferring the visible image to a recording medium, and fixing a transfer image transferred on the recording medium, wherein the toner includes a toner base particle containing at least a binder resin, a colorant and an inorganic fine particle, and a charge control agent; and wherein the condition Xsurf>Xtotal is satisfied (where Xsurf is an average proportion of the inorganic fine particles in a near-surface region of the toner base particle, Xtotal is an average proportion of inorganic fine particles in the whole toner base particle.

To provide a toner that contains at least a binder resin, a colorant, a releasing agent and zeolite, the toner being manufactured through O / W type wet granulation and having an average circularity of 0.970 or greater, and a developer and image forming method using the toner.

The present invention was investigated for the purpose of providing a binder resin for toner which is excellent in the low temperature fixing property which can cope with the development of high-speed copier machines, and is excellent in the offset resistance, blocking resistance, pulverizability and development durability.As a result, it was found that the purpose could be achieved by using, as a binder resin for toner, a resin that can be obtained from at least three different vinyl polymers with different molecular weight, contents of functional groups, and preferably from a crosslinking agent having the vinyl polymer structure, and that contains a specific gel component. This resin has excellent melting property at low temperatures, and has suitable performance as a material for toner and a toner in high-speed copier machines.

An electrophotographic toner contains a resin, a colorant and a releasing agent. The releasing agent has a solidifying point of from 79° C. to 109° C., and one peak in an endothermic curve measured by a differential scanning calorimeter. A difference between temperature to give a maximum endothermic peak of the releasing agent and an end-set temperature of the releasing agent is within 10° C. A melt viscosity of the releasing agent at 110° C. is in a range of from 4 mPa·s to 9 mPa·s. The releasing agent in one particle of the toner forms 3 or more domains. Domains having a ratio of a major axis to a minor axis which is in a range of from 5 to 15 occupy 90% or more by number based on the total number of domains.

Provided are a propylene-based polymer useful for providing a toner that is excellent in offset resistance, can be fixed by using a low-temperature heating element and hardly has stickiness even after stored for a long period of time; and a toner including said propylene-based polymer. The present invention is directed to a propylene / α-olefin copolymer (A) which includes 60 to 90 mol % of structural units derived from propylene (a) and 10 to 40 mol % of structural units derived from α-olefins having 4 or more carbon atom (b) wherein (a)+(b)=100 mol % and which satisfies: (i) a weight average molecular weight (Mw) as measured by GPC of 3,000 to 40,000; (ii) a melting point (Tm) as measured by DSC of 60 to 90° C.; and (iii) a half width of a crystalline melting point peak as measured by DSC of 1 to 20° C.

To provide a toner prepared by emulsifying or dispersing a solution or dispersion of a toner material in an aqueous medium containing fine resin particles for granulation, wherein at least one of the toner material and the aqueous medium contains a polyalkylene glycol ester compound that is compatible with the fine resin particles and that has a weight average molecular weight of 2,000 or greater.

In the control method of the power converter circuit, a primary side independent control mode and a secondary side independent control mode are adopted to solve the problems of control stability and reliability caused by long time delay and the like of wireless communication in real-time information interaction, and avoid the problems of low electric energy conversion efficiency and low power density caused by a multi-stage circuit. For a primary side transmitting circuit, a phase shift angle alpha and a primary side dynamic compensation phase angle delta of an inverter are controlled, so thatpower transmission is adjusted, and the change of a coupling coefficient is adapted. For a secondary side receiving circuit, the phase shift angle beta of the rectifier and the phase difference phi between the input voltage and the input current of the rectifier are controlled, so that the equivalent load resistance is matched with the optimal load resistance, and the secondary side dynamic compensation phase angle rho is controlled, so that the reactance of the resonance network counteracts the equivalent load reactance, and the reactance of the secondary side impedance is zero. Through a primary side dynamic compensation phase angle delta and a secondary side dynamic compensation phase angle rho of the resonance network, primary side resonance capacitance and secondary side resonance capacitance are respectively adjusted, and disturbance of relative distance and offset between coils is counteracted.