Patent ID: 8728418

Claim:
A method for producing a metal hydroxide fine particle for flame retardants by reacting a metal ion with a hydroxide ion in a solvent, the method comprising: a mixing and reacting step of creating a metal hydroxide fine particle by supplying a metal ion chosen from among magnesium ion, lanthanum ion, and calcium ion, the hydroxide ion, and a silane coupling agent to a reaction field to mix and react the ions; a purification treatment step of removing salt which is byproduct produced by mixing and reacting step from the metal hydroxide fine particle; a surface preparation step of stabilizing the surface of the metal hydroxide fine particle by applying a surface preparation agent chosen from among silane coupling agent, aluminum coupling agent, and titanate coupling agent to the metal hydroxide fine particle; a heat treatment step of flattening the metal hydroxide fine particle by applying a hydrothermal treatment to the metal hydroxide fine particle and increasing the specific surface area of the metal hydroxide fine particle; and a drying step of removing a solvent from a suspension of the metal hydroxide fine particles in the solvent, wherein the mixing and reacting step, the purification treatment step, the heat treatment step, and the drying step are performed in this order.