Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Akira Yoshida0
Masaaki Ozawa0
Date of Patent
October 3, 2006
Patent Application Number
10616965
Date Filed
July 11, 2003
Patent Primary Examiner
Patent abstract
A process for producing spherical composite cured melamine resin particles excellent in water resistance, in which colloidal silica is localized near the surface thereof, comprising (a) a step of reacting a melamine compound with an aldehyde compound in an aqueous medium under a basic condition in the presence of a suspension of colloidal silica having an average particle size of 5 to 70 nm to produce an aqueous solution of a precondensate of water-soluble melamine resin; and (b) a step of adding an acid catalyst to the aqueous solution produced in the step (a) to separate out spherical composite cured melamine resin particles.
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