MAGNESIUM HYDROXIDE PARTICLES, METHOD OF THE PRODUCTION THEREOF, AND RESIN COMPOSITION CONTAINING THE SAME

摘要

Magnesium hydroxide particles having a hexagonal platy crystal form and an aspect ratio (H) satisfying the following relationship (I) 0.45.A.B~H~1.1.A.B, wherein H represents the aspect ratio; A represents the average secondary diameter of all the particles as determined by the laser diffraction scattering method (.mu.m); and B represents the specific surface area of all the particles as determined by the BET method (m2/g)!; a flame retardant comprising the particles; a flame-retardant resin composition comprising 100 parts by weight of a synthetic resin and 5 to 300 parts by weight of the magnesium hydroxide particles; and a molded article obtained therefrom. The magnesium hydroxide particles are composed of single-crystal particles of a hexagonal platy form. Although the hexagonal shape need not be regular and the crystals need not have the same size, the particles have a specific aspect ratio in relation to the specific surface area and the average particle diameter. They have excellent properties when used as a flame retardant for synthetic resins.