Abstract: Partially stabilized cubic or tetragonal zirconia powder are provided which comprise aggregates of dense equiaxial primary particles, wherein said particles have an average diameter of less than about 150 nm and comprise zirconia and a homogeneously distributed stabilizer, as well as processes for their production employing flame combustion of homogeneous mixtures of ZrCl.sub.4 and stabilizer precursors.

Abstract: Finely divided particles of electrically conductive metal having a coating thereon a refractory metal oxide which is insoluble in the electrically conductive metal and non-reducing in the present of the electrically conductive metal, (2) the coating being sufficiently thick that the Isoelectric Point of the coated conductive metal particles is at least 1 unit higher than the Isoelectric Point of particles of the refractory metal oxide, (2) the tap density of the coated metal particles is at least 90% as high as the tap density of the uncoated metal particles, and (3) the metal oxide coating constitutes at least 0.05% by weight of the coated particles.

Abstract: An electroconductive powder composition of antimony-containing tin oxide with an outer layer of hydrous metal oxide having an isoelectric point in the range from about 5 to 9.

Abstract: Pigments are disclosed which consist essentially of rutile TiO.sub.2 particles bearing coatings comprising SiO.sub.2 and B.sub.2 O.sub.3.

Abstract: A pigment consisting essentially of rutile TiO.sub.2 particles coated with alumina or alumina-silica, and having particle surfaces associated with cerium cations and borate anions or water-soluble polyfunctional organic acid anions, is useful in coating compositions.

Abstract: Chromium dioxide has favorable magnetic properties which make it desirable as a solid support in heterogeneous immunoassays. However, to be useful in such assays it must be protected against hydrolytic degradation. This invention provides magnetic particles useful in immunoassays having a core of CrO.sub.2 which has a reduced surface, the core coated with silica and further coated with a silane.

Abstract: A pigment of TiO.sub.2 particles coated with alumina, whose particle surfaces have associated with them cerium cations and sulfate-, phosphate or silicate anions, can be used to prepare paper laminates having a high degree of lightfastness.

Abstract: A pigment of TiO.sub.2 particles coated with alumina and having associated therewith fluoride ions or fluoride compounds, can be used to prepare paper laminates having a high degree of lightfastness.

Abstract: A chalk-fade resistant TiO.sub.2 pigment exhibiting excellent gloss and dispersion that is comprised of TiO.sub.2 particles with a composite coating of dense alumina and boehmite alumina totaling 2-6% by weight alumina based on the TiO.sub.2 and a process for the preparation of such TiO.sub.2 pigment.

Abstract: A particulate or fibrous substrate having a coating of a polymeric amine aluminate or zincate prepared by contacting said substrate with said aluminate or zincate or a precursor thereof and exposing the substrate and aluminate, zincate or precursor to a temperature of 50.degree.-350.degree. C.

Abstract: Light-stable TiO.sub.2 pigment composition consisting of TiO.sub.2, Al.sub.2 O.sub.3 and antimony oxide wherein the Al.sub.2 O.sub.3 and antimony oxide are in solid solution with the TiO.sub.2 or in the form of AlSbO.sub.4 or a combination of the two.

Abstract: A pigment of TiO.sub.2 particles coated with alumina, whose particle surfaces have associated with them cerium cations and sulfate-, phosphate or silicate anions, can be used to prepare paper laminates having a high degree of lightfastness.