| 摘要 |
<p>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 (νm); 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.</p> |
