METHOD OF PRODUCING BOEHMITE SOL, BOEHMITE SOL, METHOD OF PRODUCING RECORDING MEDIUM AND RECORDING MEDIUM

摘要

PROBLEM TO BE SOLVED: To provide a method of producing a boehmite sol by which a recording medium capable of performing recording of high quality can be produced on information recording by an ink jet process, to provide a boehmite sol, to provide a method of producing a recording medium using the same, and to provide a recording medium.;SOLUTION: A boehmite sol used for the production of a recording medium for an ink jet is produced. In this case, amorphous alumina hydrate slurry prepared by neutralization reaction between a basic aluminum chloride aqueous solution and a sodium aluminate aqueous solution, preferably under the condition of ≤40°C is subjected to hydrothermal treatment in an alkali region of pH ≥10 at ≥120°C to form boehmite slurry. Thereafter, the slurry is deflocculated to form a boehmite sol. The viscosity of the boehmite sol in the case the sol concentration is controlled to 20 wt.% expressed in terms of Al₂O₃ is ≤100 cP. Also the mean fine pore size of pores formed in boehmite fine powder obtained by drying the boehmite sol is ≥15 nm. The volume of the pores is ≥0.5 cc/g.;COPYRIGHT: (C)2004,JPO