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US 5,672,427 AGranted
Zinc oxide powder having high dispersibility
AssigneeMitsubishi Materials Corporation
InventorsMasahiro Hagiwara, Akira Nishihara
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AssigneeMitsubishi Materials Corporation
InventorsMasahiro Hagiwara, Akira Nishihara
Estimating the term…
A zinc oxide powder having high dispersibility, which contains one or more metal elements selected from the group consisting of aluminum, silicon, titanium, vanadium, chromium, manganese, iron, cobalt, gallium, germanium, zirconium, indium, tin and hafnium in an amount of from 0.1 to 25 atm. % relative to the total amount of metal elements including zinc. The powder has an average primary particle size of up to 1 .mu.m and a relative transmissivity of at least 0.80. The improved properties are obtained by improving the surface of the powder by immersing the powder in one or more organic liquids selected from the group consisting of alcohols, ketones, amines and esters, and then drying the particles. When containing one or more of aluminum, gallium, germanium, indium and tin, the zinc oxide powder of the invention displays high electric conductivity and is therefore applicable as a conductive pigment.
A modified zinc oxide powder having a surface that has been modified to improve dispersibility thereof, said modified powder being obtained by a process consisting of contacting (a) an unmodified zinc oxide powder comprising 0.1 atomic % to 25 atomic % relative to a total amount of metals including zinc of at least one metal selected from the group consisting of aluminum, silicon, titanium, vanadium, chromium, manganese, iron, cobalt, gallium, germanium, zirconium, indium, tin, and hafnium, the balance being substantially zinc oxide, and having an average primary particle size of up to 1 .mu.m with (b) a surface improvement agent consisting of at least one organic liquid selected from the group consisting of alcohols, ketones, amines and esters and drying the resultant powder;
Dependencies are inferred from the claim text.