Abstract: Provided in one example herein is a three-dimensional printing method, comprising: (A) forming a layer comprising a comprising particles comprising a polymer and cavities between the particles, wherein the particles have an average diameter of between about 5 ?m and about 250 ?m; (B) disposing a liquid suspension over at least a portion of the layer such that the liquid suspension infiltrates into the cavities, wherein the liquid suspension comprises a radiation-absorbing coalescent agent and nanoparticles having an average diameter of less than or equal to about 500 nm; (C) forming an object slice by exposing the infiltrated layer to a radiant energy, wherein the object slice comprises a polymeric matrix comprising the polymeric particles, at least some of which are fused to one another, and the nanoparticles within the polymeric matrix; and (D) repeating (A) to (C) to form the three-dimensional object comprising multiple object slices bound depth-wise to one another.

Abstract: In one example, a non-transitory processor readable medium with instructions thereon that when executed cause an additive manufacturing machine to partially or completely bury a part in layers of molten build material.

Abstract: A method of fabricating a polishing pad using an additive manufacturing system includes receiving data indicative of a desired shape of the polishing pad to be fabricated by droplet ejection. The desired shape defines a profile including a polishing surface and one or more grooves on the polishing pad. Data indicative of a modified pattern of dispensing feed material is generated to at least partially compensate for distortions of the profile caused by the additive manufacturing system, and a plurality of layers of the feed material are dispensed by droplet ejection in accordance to the modified pattern.

Abstract: A method and apparatus for manufacturing polishing articles used in polishing processes are provided. In one implementation, a method of forming a polishing pad is provided. The method comprises depositing an uncured first layer of a pad forming photopolymer on a substrate. The method further comprises positioning a first optical mask over the first layer of the uncured pad forming photopolymer. The first optical mask includes a patterned sheet of material having at least one aperture. The method further comprises exposing the uncured first layer of the pad forming photopolymer to electromagnetic radiation to selectively polymerize exposed portions of the uncured first layer of the pad forming photopolymer to form pad-supporting structures within the first layer of pad forming photopolymer.

Abstract: In an example of a three-dimensional (3D) printing method, a build material (consisting of an inorganic particle and a polymer attached thereto) is applied. The polymer is a continuous coating having a thickness from about 3 nm to about 1500 nm, or nano-beads having an average diameter from about 3 nm to about 1500 nm. The build material is heated to a temperature from about 5° C. to about 50° C. below the polymer's melting point. A coalescent dispersion (including a coalescent agent and inorganic nanoparticles) is selectively applied on a portion of the build material, and the applied build material and coalescent dispersion are exposed to electromagnetic radiation. The coalescent dispersion absorbs the electromagnetic radiation and heats up the portion of the build material in contact therewith to fuse the portion of the build material in contact with the coalescent dispersion and to form a layer of a 3D object.

Abstract: Provided in one example herein is an aqueous ink composition, comprising: pigment particles comprising at least one metal oxide; an aqueous medium; and a cationic double-chain surfactant comprising a quaternary ammonium salt. Methods of making and using the ink composition are also provided.

Abstract: The present disclosure is drawn to coalescent inks and material sets for 3D printing. The coalescent ink can include a water-soluble near-infrared dye having a peak absorption wavelength from 800 nm to 1400 nm. The coalescent ink can also contain water.

Abstract: The present disclosure is drawn to coalescent inks and material sets for 3D printing. The coalescent ink can include an organic-soluble near-infrared dye having a peak absorption wavelength from 800 nm to 1400 nm. The coalescent ink can also in water and an organic co-solvent.

Abstract: A method of manufacturing a liquid electrophotographic ink concentrate includes: milling a mixture comprising ink pigments and polyamine-based dispersants in the presence of milling media to produce nano-scale ink pigments having an average particle size of less than 100 nanometers; and attaching at least one nano-scale ink pigment near surfaces of a base resin particle to form a pigment-resin composition.

Abstract: An ink-jet ink printing method and associated system can have a printer including an ink-jet ink. The ink includes an aqueous liquid vehicle, 1 wt % to 5 wt % pigment, 1 wt % to 5 wt % acrylic polymer particles, 0.3 wt % to 3 wt % urethane polymer particles, and is formulated to print on a vinyl medium. The system also includes a heating device. Upon applying heat to the ink-jet ink printed on the vinyl medium, the polymer particles in the printed ink fuse, and form a film encapsulating at least a portion of the pigment on the vinyl print medium.

Abstract: In a 3D printing method, a sinterable material is applied and heated to a temperature ranging from about 50° C. to about 400° C. A coalescent agent is selectively applied on a portion of the sinterable material, and a modifying agent is selectively applied on the portion and/or on another portion of the sinterable material. The modifying agent consists of an inorganic salt, a surfactant, a co-solvent, a humectant, a biocide, and water. The sinterable material is exposed to radiation, whereby the coalescent agent at least partially cures the portion of the sinterable material in contact with the coalescent agent, and the modifying agent i) reduces curing of the portion of the sinterable material in contact with both the coalescent agent and the modifying agent ii) prevents curing of the other portion of the sinterable material in contact with the modifying agent, or iii) both i and ii.

Abstract: A high opacity white ink containing a mica-based mineral with titania is provided. A method of manufacturing the high opacity white ink is also provided.

Abstract: A dispersed white ink contains TiO2, wherein the TiO2 includes particles contained in a thermoplastic polymer resin matrix and wherein the particles have a maximum interparticle distance of less than 1.0 ?m and exhibit a statistical variance of less than 0.02. A process for manufacturing the dispersed white ink is also provided.

Abstract: An additive manufacturing system that includes a platen, a feed material delivery system configured to deliver feed material to a location on the platen specified by a computer aided design program and a heat source configured to raise a temperature of the feed material simultaneously across all of the layer or across a region that extends across a width of the platen and scans the region across a length of the platen. The heat source can be an array of heat lamps, or a plasma source.

Abstract: An additive manufacturing system includes a platen, a feed material dispenser apparatus configured to deliver a feed material over the platen, a laser configured to produce a laser beam, a controller configured to direct the laser beam to locations specified by data stored in a computer-readable medium to cause the feed material to fuse, and a plasma source configured to produce ions that are directed to substantially the same location on the platen as the laser beam.

Abstract: Embodiments of the present disclosure relate to advanced polishing pads with tunable chemical, material and structural properties, and new methods of manufacturing the same. According to one or more embodiments of the disclosure, it has been discovered that a polishing pad with improved properties may be produced by an additive manufacturing process, such as a three-dimensional (3D) printing process. Embodiments of the present disclosure thus may provide an advanced polishing pad that has discrete features and geometries, formed from at least two different materials that include functional polymers, functional oligomers, reactive diluents, addition polymer precursor compounds, catalysts, and curing agents.

Abstract: An additive manufacturing system includes a platen, a feed material dispenser apparatus configured to deliver a feed material onto the platen, a laser source configured to produce a laser beam during use of the additive manufacturing system, a controller configured to direct the laser beam to locations on the platen specified by a computer aided design program to cause the feed material to fuse, a gas source configured to supply gas, and a nozzle configured to accelerate and direct the gas to substantially the same location on the platen as the laser beam.

Abstract: Pigment particles containing a vinyl group are encapsulated by a cross-linked polymer, wherein the polymer has a dielectric constant of 2.8 or more. An inkjet ink containing the pigment particles is also described.

Abstract: A dispersed white ink contains TiO2, wherein the TiO2 includes particles contained in a thermoplastic polymer resin matrix and wherein the particles have a maximum interparticle distance of less than 1.0 ?m and exhibit a statistical variance of less than 0.02. A process for manufacturing the dispersed white ink is also provided.

Abstract: Methods of encapsulating particles (260) in polymer (280, 382, 384) and compositions of matter using such encapsulated particles (260). Methods include mixing particles (260) of one or more materials with one or more initial radical polymerizable monomers (265) and one or more initial charge-generating components (270) to form a first suspension of monomer-wetted particles (260/265/270), mixing the first suspension with an aqueous dispersant medium (275) to form a second suspension, adding one or more initial reaction initiators to at least one of the first suspension and the second suspension, subjecting the second suspension to homogenization sufficient to form a stable submicron emulsion having an aqueous continuous phase (275), and reacting available radical polymerizable monomers (265) of the emulsion to encapsulate the particles (260) in one or more layers of polymer (280, 382, 384) and to incorporate ionic species from available charge-generating components (270).