| 摘要 |
<p>Alumina hydrate particles having a composition represented by the formula: M2O • y(NH4)2O • Al2O • zH2O, wherein [2 x 10-4 ≤ x ≤ 25 x 10-4, 0.1 x 10-4 ≤ y ≤ 20 x 10-4, 0.6 ≤ z ≤ 2.5, and M is an alkali metal], having an average particle diameter of 0.02 to 0.2 νm and a total pore volume in a range of 0.5 to 1.5 ml/g provided that the total pore volume of the pores having a pore diameter of 15 to 30 nm is 0.3 to 1.0 ml/g. The alumina hydrate particles have a greater pore volume together with a specific range of pore diameter, and a high concentration dispersion sol prepared therefrom exhibits a low viscosity and high transparency. The alumina hydrate particles can be used for forming an ink-receiving layer which provides high stability of dyes, rapid absorption and a large absorption volume for an ink, and no occurrence of bleeding.</p> |
