| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide magnesium hydroxide particles having excellent properties as a flame-retardant for a synthetic resin. <P>SOLUTION: The magnesium hydroxide particles each have a hexagonal crystal form and an aspect ratio (H) which satisfies following expression (I): 0.45×A×B<H<1.1×A×B (wherein H is an aspect ratio, A is an average secondary particle diameter (μm) of all of the particles measured by a laser diffraction scattering method and B is a specific surface area (m<SP>2</SP>/g) of all of the particles measured by a BET method). The flame-retardant resin comprises the particles. A flame-retardant resin composition comprises 100 parts by weight of a synthetic resin and 5 to 300 parts by weight of the magnesium hydroxide particles, and a molded article is obtained by molding the flame-retardant resin composition. The magnesium hydroxide particles are hexagonal single crystals, and the hexagonal form thereof are not necessarily required to be regular hexagonal, and the size thereof are not necessarily constant. However, the aspect ratio thereof has a specific value in relation to the specific surface area and the average particle diameter, and the magnesium hydroxide particles have excellent properties as the flame retardant for synthetic resins. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
