The present invention relates to a radar-compatible coating comprising metal-effect pigments on a substrate, to a process for the production of such a coating, and to the use of a substrate coated in this manner, in particular in vehicle construction.

Modified silicas, having the following physicochemical parameters: a CTAB.sub.mod of <200 m.sup.2/g, a BET.sub.MP of 50-500 m.sup.2/g, a CTAB.sub.mod-BET.sub.MP of <0 m.sup.2/g, a carbon content of >0.5% by weight, a mode.sub.mod from CPS particle size determination of >50 nm, a d75.sub.mod from CPS particle size determination of 20-150 nm, a R.sub.min from Hg pore size determination, pressurized of <10 nm, and a sulfur content of ≤1.50% by weight.

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)

Provided is a method for producing a near infrared-reflective black pigment containing at least the element calcium, the element titanium, and the element manganese, wherein the method produces a pigment that exhibits little of the elution of the element calcium and the element manganese that is caused by contact with acid. At least a calcium compound, a titanium compound, and a manganese compound are mixed by a wet grinding method and are calcined to provide a BET specific surface area of at least 1.0 m.sup.2/g and less than 3.0 m.sup.2/g. In another method, the element bismuth and/or the element aluminum is incorporated in a near infrared-reflective black pigment containing at least the element calcium, the element titanium, and the element manganese.

A composite pigment containing a substrate particle and a pigment layer arranged on a surface of the substrate particle, wherein the pigment layer contains a pigment, a resin and a metal oxide, and the metal oxide contains at least one selected from the group consisting of a silicon oxide, a polysiloxane, and composites thereof.

Provided is a novel magnesium carbonate. The magnesium carbonate has a zeta potential of 5 mV or more and a BET specific surface area of 25 m.sup.2/g or more. Such a magnesium carbonate can be used as a resin additive, etc.

The invention relates to a colored pigment particle, a method for obtaining said colored pigment particle, and a composition comprised of said particle. In addition, the invention refers to the use of said colored pigment particle.

The present invention provides a thermal spraying material capable of forming a thermally sprayed coating film having improved plasma erosion resistance. This thermal spraying material contains composite particles in which a plurality of yttrium fluoride microparticles are integrated. This thermal spraying material has a lightness L of 91 or less in the Lab color space. This lightness L is more preferably 5 or more.

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.

The titanium material includes a titanium oxide layer formed on a surface of titanium being a base material, the titanium oxide layer having a thickness measured by a glow discharge spectrometry of 60 to 300 nm, wherein: the titanium oxide layer contains 0.5 to 7.0 at % of nitrogen, and an arithmetic mean roughness Ra of a surface thereof is 2.0 to 4.0 μm; and a power spectrum of a surface roughness of the titanium material has a peak of an amplitude height of 0.005 to 0.020 μm in a range of a wavelength of 1.1 to 2.5 μm and has a peak of an amplitude height of 0.0010 to 0.0030 μm in a range of a wavelength of 0.80 to 0.98 μm. An L*a*b* color space may be L*: 30 to 40, a*: 2.0 to 9.0, and b*: −7.0 to 18.0.