166results about How to "Improve chargeability" patented technology

A liquid ink comprises (a) a carrier liquid having a Kauri-Butanol number less than 30; (b) a graft copolymer comprising a (co)polymeric steric stabilizer covalently bonded to a thermoplastic (co)polymeric core that is insoluble in the carrier liquid; and (c) a colorant, wherein the steric stabilizer comprises units derived from 3,3,5-trimethylcyclohexyl methacrylate, and the thermoplastic (co)polymeric core comprising units derived from at least a polymerizable monomer selected from the group consisting of (meth)acrylates having aliphatic amino radicals, nitrogen-containing heterocyclic vinyl monomers, N-vinyl substituted ring-like amide monomers, aromatic substituted ethylene monomers containing amino radicals, and nitrogen-containing vinylether monomers. The organosol provides improved liquid electrophotographic and electrographic ink compositions with improved dispersion stability, chargeability, and blocking resistance so that improved print quality or ink transfer performance are obtained.

A toner for developing an electrostatic image, includes: a colorant; and a binder resin. The toner has a particle including at least one pore having a diameter of 10 nm or over, and a porosity thereof is in a range from 0.01 to 0.60.

The invention provides a modified polypropylene master batch, melt-blow cloth, a preparation method and an application thereof. The modified polypropylene master batch is mainly produced from, by weight, 77-90% of polypropylene, 5-20% of a graphene material and 1-5% of an additive. The graphene material includes any one or more of graphene, graphene oxide and graphene derivative. The additive includes any one or more of a coupling agent, a dispersant and an antioxidant and preferably includes the coupling agent, the dispersant and the antioxidant. The modified polypropylene master batch, when being used for manufacturing the melt-blow cloth, not only improves antibacterial and electrification property but also increases the filtering efficiency and dust capacity of the melt-blow cloth.

A toner is provided including a binder resin including at least one polyester resin in an amount of from 50 to 100% by weight, and a colorant having a specific formula, wherein the toner has a shape factor SF-1 of from 120 to 150 and a shape factor SF-2 of from 125 to 180; and a developer using the toner.

A toner is provided that contains a binder resin; a colorant; a release agent; and an external additive, wherein the toner has an average circularity of from 0.940 to 0.965 and a crater having a depth of from 0.02 to 0.1 μm, and wherein the crater has an amount of the external additive larger than an average amount thereof on the toner, along with a two-component developer containing the toner and an image forming apparatus using the toner.

An image forming apparatus including: a latent electrostatic image bearing member, a charging unit, an exposing unit, a developing unit, a transfer unit, and a fixing unit, wherein the toner contains at least a binder resin and a colorant, the binder resin contains a polyester resin obtained by polycondensation of an alcohol component with a carboxylic acid component containing a rosin compound, the amount of the rosin compound contained in the carboxylic acid component is 5% by mass or more based on the total mass of the alcohol component and carboxylic acid component, and the amount of an abietic acid contained in the toner is 1% by mass or less.

The present invention relates to a toner for developing an electrostatic latent image comprising a colorant, a binder resin having a number-average molecular weight of 2000 to 5000 and a ratio of weight-average molecular weight/number-average molecular weight of 5 to 30, a polymer having a weight-average molecular weight of 1000 to 3000 and a ratio of weight-average molecular weight/number-average molecular weight of 2.0 or less, and a release agent.

A toner including toner particles including a binder resin, a colorant, and an inorganic particulate material present on a surface of the toner particles. The toner particles have a surface roughness (Ra) of from 1 to 30 nm, a standard deviation of the surface roughness of from 10 to 90 nm and include 1 to 20 convexities per 1 μm, which have a height not less than 10 nm.

A toner including a binder resin, a colorant, and a silicon-containing polymer, which is manufactured by a method including: discharging a toner constituent liquid including toner constituents including the binder resin, the colorant, and the silicon-containing polymer, from at least one discharge opening to form liquid droplets thereof; and converting the liquid droplets into solid toner particles in a granulation space.

The invention provides colloid palladium activation solution which comprises colloid palladium, sodium chloride, glyoxylic acid, hydrochloric acid, stannous chloride and stabilizer for stabilizing the stannous chloride, wherein the glyoxylic acid has strong reducibility and can avoid that divalent tin ions in the activation solution are oxidized, and prolong the service life of the action solution; simultaneously, the glyoxylic acid is adsorbed on the periphery of colloid palladium particles, thereby leading the dispersion of the colloid palladium to be more uniform, avoiding the gel coagulation among the colloid particles and enhancing the activity of the activation solution. The invention provides a preparation method of the colloid palladium, and the process is simple. In addition, the adoption of the colloid palladium activation solution for activating the surface of a non-metal substrate can firstly adsorb the glyoxylic acid in the activation solution on the surface of the non-metal substrate, enhance the bonding force between the colloid palladium particles and the non-metal substrate, leading a plated coating after chemical plating to have uniform thickness and flat surface, and leading the adhesion between the plated coating and the substrate to be very high.

Hydrophobic inorganic fine particles characterized by being a mixture of at least small-particle-diameter inorganic fine particles having an average primary particle diameter of 5 to 25 nm and having a maximum peak particle diameter of 20 nm or less and large-particle-diameter inorganic fine particles having an average primary particle diameter which is 1.5 to 100 times the average primary particle diameter of the small-particle-diameter inorganic fine particles; the mixture being a mixture having been treated in the same treating tank to subject both the small-particle-diameter inorganic fine particles and large-particle-diameter inorganic fine particles simultaneously to hydrophobic treatment.

A toner whose flowability, chargeability and fixing property are enhanced, a developer, a developing device and an image forming apparatus are provided. The toner comprises a toner particle in which a shell layer is formed on a surface of a core particle, and external additive, where (1) the shell layer is formed in a film on the surface of the core particle, (2) a shape factor SF-2 is 120 or more and 140 or less, and (3) a BET specific surface area measured by the BET method is 1.2 m²/cm³ or more and 4.0 m²/cm³ or less. The developer containing such a toner is filled into the developing device in the image forming apparatus in order to form an image.

A toner is formed of toner particles each comprising at least a binder resin, a colorant and a wax, and inorganic fine powder. The toner is characterized by (a) containing a sulfur-containing polymer, and (b) showing dielectric loss tangent (tandelta) values at 100 kHz assuming a maximum of 2.5x10-2 to 8x10-2 in a temperature range of 100 to 130° C. Because of the combination of the features (a) and (b), the toner can exhibit a good combination of developing performances and fixing performances.

A toner obtained by a toner production method which includes dissolving or dispersing in an organic solvent a toner material containing at least a calixarene derivative and a binder resin or a binder resin precursor, to thereby prepare a solution or dispersion liquid of the toner material, adding the solution or dispersion liquid to an aqueous medium for emulsification or dispersion, to thereby prepare an emulsion or dispersion liquid, and removing the organic solvent from the emulsion or dispersion liquid.

Foreign materials can be continuously attracted by means of a cleaning roller for a relatively long period of time without requiring maintenance. A cleaning roller (11) is brought into contact with the surface (S1) of a material to be cleaned (S), and the foreign materials, such as dusts, which are adhered on the surface (S1) of the material to be cleaned (S) are removed using an electrostatic force. A transfer roller (51) is provided on the cleaning roller (11) surface on the reverse side of the surface having the material to be cleaned (S) thereon, and the foreign materials adhered on the cleaning roller (11) are transferred onto the transfer roller (51). An electrostatic charge control roller (21) which rotates in contact with the outer circumferential surface of the cleaning roller (11) is provided, and the electrostatic charge quantity of an outer layer section (11c) of the cleaning roller (11) can be controlled. As a material for forming the outer layer section of the transfer roller (51), a material which can be charged with electrostatic charges that can attract the foreign materials adhered on the outer circumferential surface of the cleaning roller (11) to the outer circumferential surface by means of an electrostatic force is selected.

A cleaning device for cleaning an image carrier by removing toner and other residues left thereon of the present invention includes a brush having tips, which contact the surface of the image carrier, provided with a loop configuration and a contact pressure of 50 g/cm². A toner collecting space is located at a position adjacent to the brush and at which the tips of the brush contacted the surface of the image carrier arrive in accordance with the movement of the brush.