摘要:
Processes for making toners, and in particular, emulsion aggregation (EA) toners. These toners exhibit a low melt temperature while simultaneously exhibiting excellent relative humidity sensitivity regarding charging properties. In embodiments, the process comprises the preparation of the latex emulsion comprising high ratio resin compositions by injection of steam and neutralization agent vapors into the latex emulsion.
摘要:
A system and method are provided for producing variable pearlescent image elements or portions on image receiving media substrates using a variable digital data offset lithographic architecture which provides for varying lithographic images between cycles of a marking device. Pearlescent inks are provided with a solid particle pearlescent pigment components in a proportion of at least 30% by weight suspended in solution in an ink composition. Pearlescent inks are provided with a solid particle pearlescent pigment components having particle sizes in excess of ten microns suspended in solution in the ink composition. The disclosed systems and methods provide for variable pearlescent image elements or portions to be formed on an image receiving medium substrate separate from, or in combination with, other ink image elements or portions applied using other inks in a single device, and/or in a single pass of the image receiving media substrates through an image forming system.
摘要:
A method and system for magnetic actuated mixing which use magnetic particles and electromagnetic field to facilitate the mixing. The method and system use magnetic particles and a generated electromagnetic field to facilitate the milling as well. The method and system can be used in any application that requires the preparation of small-sized particles at either the micro or nano scale, including for example, preparing toners, inks, wax, pigment dispersions and the like.
摘要:
The method of manufacturing toners disclosed herein includes a continuous temperature ramp and coalescence process that involves continuously passing toner slurry, such as an aggregated toner slurry, through at least one heat exchanger before being subjected to a cooling step. The heat exchanger is pressurized, so the temperature of the slurry may be increased above the atmospheric boiling point of water without boiling the water component of the slurry. Because of these higher temperatures, the coalescence step can be completed more quickly than in conventional batch processes. More than two heat exchangers may be connected in the coalescence step, yielding multiple ramping/cooling temperature steps, ability to inject components, or recycling heat from the process to reduce energy consumption.
摘要:
A method for preparing a latex or dispersion, the method comprising contacting at least one resin with an organic solvent to form a resin mixture; neutralizing the resin mixture with a neutralizing agent; and subjecting the resin mixture flow to steam flow in a continuous manner to form a dispersion. A method for forming toner, the method comprising: contacting a resin to an organic solvent and a neutralizing agent to form a resin mixture; subjecting the resin mixture flow to a steam flow in a continuous manner to form a dispersion; aggregating particles from a pre-toner mixture, the pre-toner mixture comprising the dispersion, an optional colorant, and an optional wax; and coalescing the aggregated particles to form toner particles. An apparatus that can perform the methods.
摘要:
A process for preparing a pigmented wax dispersion including (a) melting and mixing a dry pigment with at least one wax to form a pigment concentrate, wherein the pigment concentrate contains at least 25 percent by weight of pigment; (b) milling the pigment concentrate of step (a) to form a milled pigment concentrate; (c) combining the milled pigment concentrate of (b) with water and dispersing to form a pigmented wax dispersion comprising a plurality of pigmented wax particles comprising a pigment core surrounded by a wax shell, wherein the pigmented wax particles exhibit a particle size distribution of from about 150 nanometers to less than about 300 nanometers; wherein the melting and mixing of step (a) and the milling of step (b) is done in an immersion media mill; and wherein the combining of step (c) is done using a piston homogenizer.
摘要:
A system for pigment milling includes a pulsing direct current (DC) source that generates a DC pulse, an electromagnetic field generating subunit that includes an electromagnetic coil coupled to the pulsing DC source to receive the DC pulse and to generate a magnetic field, and a rotating container subunit that includes a container for holding magnetic particles and ink pigment particles in an ink carrier, and a rotating subunit to rotate the container. A portion of the container is disposed within the electromagnetic coil and generation of the magnetic field causing motion of the magnetic particles thereby dispersing the ink pigment particles within the ink carrier.
摘要:
A toner including a resin; and a colorant wax comprising a plurality of colorant wax particles comprising a colorant core surrounded by a wax shell, wherein the colorant wax particles exhibit a particle size distribution of from about 150 nanometers to less than about 300 nanometers; and wherein the colorant wax is prepared by (a) melting and mixing a dry colorant with at least one wax to form a colorant concentrate, wherein the colorant concentrate contains at least 25 percent by weight of colorant; (b) milling the colorant concentrate of step (a) to form a milled colorant concentrate; (c) combining the milled colorant concentrate of (b) with water and dispersing to form the plurality of colorant wax particles; wherein the melting and mixing of step (a) and the milling of step (b) is done in an immersion media mill; and wherein the combining of step (c) is done using a piston homogenizer.
摘要:
Pigment dispersions are prepared by including magnetic particles in a reaction mixture. When placed in an alternating current magnetic field, milling of pigment particles occurs in the reaction mixture.
摘要:
A process for preparing a pigment dispersion including melting a phase change ink carrier and an optional dispersant at a temperature of from about 100° C. to about 170° C. in a jacketed vessel comprising a jacket surrounding an immersion mill or basket mill attachment and a dispersion blade attachment disposed within the jacketed vessel; mixing the melted phase change ink carrier and optional dispersant with a dispersion blade in the jacketed vessel; adding a pigment to the melted, mixed phase change ink carrier and optional dispersant in the jacketed vessel; wetting the pigment; after pigment wetting, reducing the pigment particle size using an immersion mill or basket mill attachment in the jacketed vessel; and discharging the pigment dispersion.