PROCESS FOR PRODUCING METAL POWDER HAVING CONTROLLED PARTICLE SIZE DISTRIBUTION FOR METALLIC PIGMENTS

Disclosed is a graded metal powder for metallic pigment, comprising a metal powder wherein the metal powder has a mean particle size of from about 2.5 to about 15.0 mu m, the content of particles having a particle size of not greater than 1 mu m is not larger than about 0.5% by volume, and the metal...

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Bibliographische Detailangaben
Hauptverfasser:	SAITO, KAJIN, OZAWA, SINYA, KONDO, KATSUMI
Format:	Patent
Sprache:	eng
Schlagworte:	ADHESIVES CASTING CHEMISTRY DYES MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLIDMATERIALS OR FLUIDS MAKING METALLIC POWDER MANUFACTURE OF ARTICLES FROM METALLIC POWDER METALLURGY MISCELLANEOUS APPLICATIONS OF MATERIALS MISCELLANEOUS COMPOSITIONS NATURAL RESINS PAINTS PERFORMING OPERATIONS POLISHES POWDER METALLURGY PREPARATION OF CARBON BLACK SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATICTABLES OR JIGS SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATICTABLES OR JIGS TRANSPORTING TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS,TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES WORKING METALLIC POWDER
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Beschreibung
Zusammenfassung:	Disclosed is a graded metal powder for metallic pigment, comprising a metal powder wherein the metal powder has a mean particle size of from about 2.5 to about 15.0 mu m, the content of particles having a particle size of not greater than 1 mu m is not larger than about 0.5% by volume, and the metal powder has a particle size distribution such that not smaller than 97% by volume of the particles of the metal powder fall within the range between half the mean particle size of the metal powder and double the mean particle size of the metal powder. Also is disclosed a process for producing a graded metal powder by classifying metal particles dispersed in a mineral oil containing a nonionic-anionic surfactant.