ACICULAR BOEHMITE

摘要

PROBLEM TO BE SOLVED: To provide acicular boehmite which can further improve the stiffness of resins when the boehmite is used as a filler of the resins. SOLUTION: The present invention provides acicular boehmite having a BET specific surface area of 20 to 80 m2/g, a dioctyl phthalate oil absorption of 200 to 600 cm3/100 g, a minor axis length of 30 to 300 nm and an aspect ratio of 5 to 50, which may be produced by hydrothermally reacting raw material aluminum hydroxide powder at a temperature of 160 to 250°C in an aqueous solution having pH of 4 to 6 and containing 0.2 to 5 mol/L of a salt of a metal ion selected from magnesium ion (Mg2+), manganese ion (Mn2+) and zinc ion (Zn2+) and an anion selected from carboxylate ion, nitrate ion (NO3-) and sulfate ion (SO42-). The resin composition obtained by filling the acicular boehmite into the resins has excellent stiffness. COPYRIGHT: (C)2008,JPO&INPIT