MODIFIED INORGANIC OXIDE SOL AND ITS PRODUCTION

摘要

PROBLEM TO BE SOLVED: To provide a modified colloid particle having a specific average particle diameter and excellent dispersibility in organic solvent, giving a transparent organosol and produced by using a colloid particle of an inorganic oxide having a specific average particle diameter as a core and coating the surface with organic cation. SOLUTION: The modified inorganic oxide particle having an average particle diameter of 4-500 mμis produced by using a colloid particle of an inorganic oxide particle having an average particle diameter of 2-100 mμas a core. Concretely, the inorganic oxide is modified with a quaternary ammonium ion expressed by formula I and formula II (R1 to R6 are each an alkyl). The modified oxide particle can be produced by adding a solution of a quaternary ammonium salt to a hydrosol of a negative inorganic oxide and filtering and drying the produced precipitate. The quaternary ammonium salt is especially preferably lauryltrimethylammonium bromide or dilauryldimethylammonium bromide. Water or a mixture of water and an organic solvent is used as the solvent for the quaternary ammonium salt solution.