A zinc oxide powder in which a BET specific surface area (X) of the powder is 1.5 m.sup.2/g or more and 65 m.sup.2/g or less, a value obtained by a formula: an apparent specific volume (mL/g) measured by a loose packing method of the zinc oxide powder/an apparent specific volume (mL/g) measured by a tapping method of the zinc oxide powder is 1.5 or more and 2.5 or less, and Formula (1) and Formula (2) shown below are satisfied.

A1/E2=aX+0.06  (1)

(M2−M1)/E2≥0.02  (2)

The present invention provides a glitter pigment capable of simultaneously achieving electromagnetic wave transmission properties, a high reflectance in appearance, and a neutral color in appearance. The glitter pigment according to the present invention includes: a glass flake 1; and a titanium oxide layer 2 and a silver layer 3 formed in this order on the glass flake 1, wherein a product of the optical thickness of the glass flake 1 and the optical thickness of the titanium oxide layer 2 is 61000 or more and 66000 or less when the optical thickness is expressed in nm, and the silver layer 3 has a physical thickness of 35 nm or more and 55 nm or less.

This zirconia powder contains 2.5 to 3.5 mol % of yttria; has a specific surface area of 5 to 20 m.sup.2/g; and has crystal phases that include a monoclinic crystal phase percentage of 20 to 40% and a tetragonal crystal phase percentage of 60 to 80%. When the zirconia powder is molded under a mold pressure of 0.8 t/cm.sup.2 and then sintered under a condition of 2 hours at 1450° C. to obtain a sintered body, the sintered body has crystal phases that include a monoclinic crystal phase percentage of 1 to 3%, a tetragonal crystal phase percentage of 77 to 94%, and a cubic crystal phase percentage of 5 to 20%.

Process for producing a haematite pigment having an a* value greater than 20, especially greater than 25, CIELAB units measured as a full shade in alkyd resin to DIN EN ISO 787-25:2007, by reacting iron sulfate with oxygen in the presence of a pigment seed, characterized in that a) water comprising i) at least one pigment seed selected from the group consisting of FeOOH and Fe.sub.2O.sub.3 and ii) iron sulfate forms an initial charge and b) at least one alkaline earth metal carbonate, especially CaCO.sub.3, MgCO.sub.3, CaMg(CO.sub.3).sub.2 or mixtures thereof and c) oxygen-containing gas
are added to the initial charge, where at least 95% by weight of the total amount of iron sulfate used in the process is present in the initial charge a) prior to addition of components b) and c).

In producing titanium oxide containing rutile-type crystals by adding hydrochloric acid to an aqueous dispersion of an alkali metal titanate, sulfurous acid, disulfurous acid, sulfuric acid or a salt thereof is added. Thus, there is provided a titanium oxide powder which is doped with bivalent sulfur atoms (S.sup.2−) and in which a ratio (I.sub.A/I.sub.R) of a peak intensity (I.sub.A) of anatase-type crystals to a peak intensity (I.sub.R) of rutile-type crystals as measured by X-ray diffractometry is 0.1 or less. Moreover, a cosmetic is provided by dispersing the titanium oxide powder in a dispersion medium. Thus, bluish color derived from Rayleigh scattering is negated, providing a dispersion, particularly a cosmetic, with excellent transparency and color tone.

An infrared reflecting fiber includes 76.0 parts by weight to 88.5 parts by weight of a carrier, 1.8 parts by weight to 4.0 parts by weight of an infrared reflecting composition, 2.5 parts by weight to 7.5 parts by weight of a titanium dioxide containing composition, and 6.0 parts by weight to 16.0 parts by weight of a color adjusting composition. The carrier includes polyethylene terephthalate (PET). When a content of 5.0 wt % to 7.5 wt % of the infrared reflecting composition and a balance of the carrier are mixed together to form a first fiber, a maximum infrared reflectivity of the first fiber is between 61% and 70%.

The present disclosure relates to a method for preparation of a high temperature-resistant bismuth yellow pigment. The method comprises: mixing an oxide which served as a matrix and dopan with a bismuth source, a vanadium source, or a molybdenum source, and then placing the mixture into a mill for grinding to obtain a precursor; further calcining and crushing the precursor to obtain the high temperature-resistant bismuth yellow pigment powder. The bismuth yellow pigment has a bright color, a b* value greater than 90, a stable performance, and a high heat-resistance above 800° C. The method is environmentally friendly without waste, and reaction conditions are simple. Doping of BiVO.sub.4 crystal lattices by incorporation of oxides can be achieved, so that the particle size and distribution of the bismuth yellow pigment can be effectively controlled while the color performance of the bismuth yellow pigment is greatly improved.

The disclosure relates to a method for mechanochemical preparation of an iron red pigment, which comprise steps: mixing a clay mineral, a soluble iron source and an alkali source in a mill for grinding to obtain a precursor, wherein the ratio of ball to material is controlled at 20-50, the grinding speed is 300-1200 rpm, and the grinding time is 30-360 min; and calcining the precursor at 500-900° C. for 30-120 min to obtain a high-performance iron oxide red/clay mineral hybrid pigment. The iron oxide red/clay mineral hybrid pigment has a bright and beautiful color, high-temperature and acid resistance, and can satisfy requirements for high-performance iron oxide red pigments in fields of paints, inks, ceramics, anti-corrosive coatings, etc. Furthermore the method is a simple process without waste that is environmentally friendly and suitable for industrialized production, thus it is expected to replace existing processes of iron oxide red pigments.

Heat ray shielding fine particles, heat ray shielding fine particle dispersion liquid, heat ray shielding film, heat ray shielding glass, heat ray shielding dispersion body, and heat ray shielding laminated transparent substrate that exhibit heat ray shielding properties and suppress scorching sensation on skin when employed in window materials and the like, also enable usage of communication devices, imaging devices, sensors, etc. that employ near-infrared light across these structures. The particles are composite tungsten oxide fine particles having a heat ray shielding function; and when a visible light transmittance is 85% when computed for light absorption by the particles alone, the average value of transmittance in the wavelength region from 800 nm to 900 nm is 30%-60%, and the average value of transmittance in the wavelength region from 1200 nm to 1500 nm is 20% or lower, and the transmittance at a wavelength of 2100 nm is 22% or lower.

The invention provides pigment particles and an organic modification layer formed on a surface of the pigment particles; the organic modification layer is a surfactant layer or a polymer material layer formed on the surface of the pigment particles; an organic matter content over the specific surface area W.sub.surf of the pigment particles is in a range of 0.1-2% g/m.sup.2. The surface-modified pigment particles provided by the invention have good stability, and the electrophoretic display prepared by using the surface-modified pigment particles of the invention has good optical performance.