The method for fabricating a hybrid dual phase filler for elastomers includes: impregnation of carbon black with ethanol suspension of magnetite in a ball mill; drying of the dual phase mixture till constant weight; grinding of the dried product in a ball mill; thermal activation under vacuum in a specifically designed reactor followed by a grinding of the final product in a ball mill. The hybrid dual phase filler includes carbon black impregnated with ethanol suspension of magnetite, contains 5 to 50 mass % of magnetite and 95 to 50 mass % of carbon black. Magnetite is a powder and includes up to 5% of SiO.sub.2, particle size up to 50 and density of 4.8-5.2 g/cm.sup.3 with a specific surface area (BET/) 400-900 m.sup.2/g; iodine number370-750 mg/g; oil number 200-450 ml/100 g; total volume pore 0.5-1.5 cm.sup.3(STP)/g; micropore surface area 50-90 m.sup.2/g; external specific surface area 400-900 m.sup.2/g.

A colorant including a mixture of pigments is disclosed. The pigments have a similar coloration but different resistance to corrosion. The mixing ratio is selected to optimize the corrosion resistance against color brightness, and/or acidic corrosion resistance against alkali corrosion resistance of the colorant.

The present invention provides a spherical ferrite powder that is excellent in filling ability and moldability if used as a filler, is excellent in handling ability, and is high in resistivity; a resin compound including the ferrite powder; and a molded product made of the resin compound. The spherical ferrite powder including 15 to 30 wt % of ferrite particles having the particle diameter less than 11 m and have the volume average particle diameter of 10 to 50 m; the resin compound including the ferrite powder; and the molded product made of the resin compound are employed.

An epsilon iron oxide has an average particle size of 10 to 18 nm, a part of the iron element being substituted with a substitutional element and has a coercive force of 14 kOe or less, wherein a coefficient of variation of the particle size is 40% or less. A method for producing the same, a magnetic coating material and a magnetic recording medium using the epsilon iron oxide, includes depositing a metal compound of a substitutional element on iron oxide hydroxide to thereby obtain iron oxide hydroxide on which the metal compound is deposited; coating the iron oxide hydroxide on which the metal compound is deposited, with silicon oxide to thereby obtain iron oxide hydroxide coated with the silicon oxide; and applying heat treatment to the silicon oxide-coated iron oxide hydroxide in an oxidizing atmosphere, wherein a part of an iron element is substituted with the substitutional element.

The invention relates to metallic effect pigments with coating, comprising a platelet-shaped substrate, where the coating comprises at least one hybrid inorganic/organic layer, the hybrid layer having at least partly an inorganic network that has one or more inorganic oxide components, and having at least one organic component, the organic component being at least partly an organic oligomer and/or polymer which is covalently bonded at least partly to the inorganic network via one or more organic network formers. The invention further relates to a method of producing these metallic effect pigments, and to their use.

The invention relates to metallic effect pigments with coating, comprising a platelet-shaped substrate, where the coating comprises at least one hybrid inorganic/organic layer, the hybrid layer having at least partly an inorganic network that has one or more inorganic oxide components, and having at least one organic component, the organic component being at least partly an organic oligomer and/or polymer which is covalently bonded at least partly to the inorganic network via one or more organic network formers. The invention further relates to a method of producing these metallic effect pigments, and to their use.

The present invention is directed to an electrophoretic dispersion comprising charged pigment particles dispersed in a solvent or solvent mixture, wherein at least one type of the charged pigment particles has an aggregation size about 2 to about 10 times their primary size and/or has a PDI in the range of 0.1 to 0.3. The electrophoretic dispersion of the present invention is capable of improving both image bistability and contrast ratio through adjusting the size distribution of the charged pigment particles.

The present invention is directed to an electrophoretic dispersion comprising charged pigment particles dispersed in a solvent or solvent mixture, wherein at least one type of the charged pigment particles has an aggregation size about 2 to about 10 times their primary size and/or has a PDI in the range of 0.1 to 0.3. The electrophoretic dispersion of the present invention is capable of improving both image bistability and contrast ratio through adjusting the size distribution of the charged pigment particles.

The present invention relates to mixtures of pigments comprising at least one inorganic compound selected from the group of iron oxides, iron oxide hydrates, zinc ferrites, zinc oxides, magnesium ferrites and manganese ferrites, wherein the at least one inorganic compound is equipped with a coating comprising at least one hydroxide or oxide of magnesium or calcium and at least one calcium salt or magnesium salt of a fatty acid, to processes for production thereof, to the use thereof for coloring polyvinyl chloride (PVC) and to processes for coloring PVC and to PVC colored with such mixtures, and also to plastics products comprising such mixtures.

The present invention relates to pigments comprising at least one inorganic compound selected from the group of iron oxides, iron oxide hydroxides, zinc ferrites, zinc oxides, magnesium ferrites and manganese ferrites, wherein the at least one inorganic compound is equipped with a coating comprising at least one hydroxide or oxide of magnesium or calcium and at least one fatty acid salt, to processes for production thereof, to the use thereof for coloring polyvinyl chloride (PVC) and to processes for coloring PVC and to PVC colored with such pigments, and also to plastics products comprising such pigments.