Porous metal oxide microspheres are prepared via a process comprising forming a liquid dispersion of polymer nanoparticles and a metal oxide; forming liquid droplets of the dispersion; drying the droplets to provide polymer template microspheres comprising polymer nanospheres; and removing the polymer nanospheres from the template microspheres to provide the porous metal oxide microspheres. The porous microspheres exhibit saturated colors and are suitable as colorants for a variety of end-uses.

Porous metal oxide microspheres are prepared via a process comprising forming a liquid solution or dispersion of polydisperse polymer nanoparticles and a metal oxide; forming liquid droplets from the solution or dispersion; drying the liquid droplets to provide polymer template microspheres comprising polymer nanospheres and metal oxide; and removing the polymer nanospheres from the template microspheres to provide the porous metal oxide microspheres. The porous microspheres exhibit saturated colors and are suitable as colorants for a variety of end-uses.

A titanium oxide particle includes a metal compound having a metal atom and a carbon atom and being bonded to a surface through an oxygen atom. The titanium oxide particle has absorption at a wavelength of 450 nm and a wavelength of 750 nm in a visible absorption spectrum and satisfies 0.03A0.3 where A represents a value of {(peak intensity of CO bond+peak intensity of CO bond)/(peak intensity of CC bond+peak intensity of CC bond)} in an XPS spectrum of a carbon 1s orbital.

The present disclosure provides white pigment dispersions, which can include an aqueous liquid vehicle, and from 5 wt % to 70 wt % of a white metal oxide pigment dispersed by two co-dispersants. The metal oxide pigment can have an average particulate size from 100 nm to 1 m, and the co-dispersants can include both i) a short-chain anionic dispersant having a weight average molecular weight ranging from 1,000 Mw to 30,000 Mw, and ii) a non-ionic or predominantly non-ionic dispersant.

The present invention relates to an ink-jet printing method using a water-based ink containing a rutile-type titanium oxide and a polymer dispersant, in which the polymer dispersant contains a constitutional unit derived from an anionic group-containing monomer selected from the group consisting of acrylic acid, methacrylic acid and the like in an amount of not less than 72% by mass; Mw of the polymer dispersant is from 3,000 to 50,000; and a content of the polymer dispersant in the water-based ink is from 1 to 7% by mass on the basis of the titanium oxide, said method including the step 1 of redispersing the water-based ink by a dispersing means and the step 2 of printing characters or images on a printing medium using the redispersed water-based ink. According to the ink-jet printing method of the present invention, even though the titanium oxide is precipitated, it is possible to readily redisperse the titanium oxide in the water-based ink by simple stirring operations, and further by using the water-based ink whose properties can be rapidly restored owing to excellent foam suppressing properties and defoaming properties thereof, it is possible to attain good ejection properties of the ink.

A titanium oxide particle includes a metal compound having a metal atom and a carbon atom and being bonded to a surface through an oxygen atom. The titanium oxide particle has absorption at a wavelength of 450 nm and a wavelength of 750 nm in a visible absorption spectrum and satisfies 0.03A0.3 where A represents a value of {(peak intensity of CO bond+peak intensity of CO bond)/(peak intensity of CC bond+peak intensity of CC bond)} in an XPS spectrum of a carbon 1s orbital.

Provided is a titanium dioxide pigment having minimal yellow color and minimal yellowing due to exposure, i.e., good yellowing resistance and high pigment performance such as brightness. Also provided is a titanium dioxide pigment which has a reduced amount of volatile moisture and which does not readily decompose when blended with a resin or the like. In the present invention, a compound including 0.05-20% by mass of phosphorus and an alkaline earth metal is present on surfaces of titanium dioxide particles having an average particle diameter of 0.15-1.0 m. The titanium dioxide pigment is manufactured by mixing an alkaline earth metal compound, a phosphate compound, and titanium dioxide particles having an average particle diameter of 0.15-1.0 m, and bonding the compound including phosphorus and an alkaline earth metal to the titanium dioxide particles.

A method is disclosed of producing stable nanosized colloidal suspensions of particles with limited crystallinity loss, products thereof, use of the products and an apparatus for the method. In particular the present invention relates to a wet milling method with small beads wherein the size of the final particles in suspension are stabilized in the nanorange (D50<75 nm) and at the same time the particles substantially maintain the crystallinity.

The present invention discloses the morphology of hollow, double-shelled submicrometer particles generated through a rapid aerosol-based process. The inner shell is an essentially hydrophobic carbon layer of nanoscale dimension (5-20 nm), and the outer shell is a hydrophilic silica layer of approximately 5-40 nm, with the shell thickness being a function of the particle size. The particles are synthesized by exploiting concepts of salt bridging to lock in a surfactant (CTAB) and carbon precursors together with iron species in the interior of a droplet. This deliberate negation of surfactant templating allows a silica shell to form extremely rapidly, sealing in the organic species in the particle interior. Subsequent pyrolysis results in a buildup of internal pressure, forcing carbonaceous species against the silica wall to form an inner shell of carbon. The incorporation of magnetic iron oxide into the shells opens up applications in external stimuli-responsive nanomaterials.

Disclosed are a vinyl chloride based nanocomposite composition and a method of preparing the vinyl chloride based nanocomposite. According to the present invention, a method of preparing a straight vinyl chloride based nanocomposite having a nanomaterial uniformly dispersed therein, by using the vinyl chloride based nanocomposite composition when a vinyl chloride monomer is suspension polymerized in the presence of a protective colloidal agent and a polymerization initiator after preparing a water dispersion suspension using the vinyl chloride based nanocomposite composition based on a hydrophilic composition is provided.