| abstract |
PROBLEM TO BE SOLVED: To provide a phosphorus-containing coated MgO powder having very excellent water resistance and a method for producing the same. Moreover, providing the resin composition excellent in water resistance containing the phosphorus containing coating MgO powder. SOLUTION: The coated magnesium oxide powder having a coating layer made of a double oxide on the surface, further comprising a coating layer made of a magnesium phosphate compound on at least a part of the surface, and the coated magnesium oxide powder. The phosphorus-containing coated magnesium oxide powder, wherein the content of the magnesium phosphate-based compound is 0.1 to 10% by mass in terms of phosphorus, and a coating layer of a double oxide on the surface A magnesium phosphate-based compound is formed on at least a part of the surface of the coated magnesium oxide powder by treating the coated magnesium oxide powder having a phosphorous compound, followed by firing at 300 ° C. or higher. A method for producing a coated magnesium oxide powder, and a resin composition containing the powder. [Selection figure] None |