| 摘要 |
A recording medium for ink jet printing comprises a base material layer such as paper or plastic sheet, a porous lower layer formed on the base material layer, and a porous upper layer formed on the porous lower layer. The porous lower layer contains hydrated alumina showing a boehmite structure. The porous upper layer mainly comprises agglomerates of spherical silica particles with particle diameters ranging between 1 and 100 nm and a binder and contains voids mainly found between the agglomerates, not within the agglomerates. Preferably, a second type of spherical silica particles having smaller particle diameters than the above first type of spherical silica particles are also contained in the porous upper layer, and in this case, the first type particles have particle diameters ranging between 10 and 100 nm and are mostly found outside the agglomerates, while the second type particles have particle diameters ranging between 1 and 10 nm and are mostly found within the agglomerates. The recording medium provides excellent image qualities even when a large amount of ink is applied at a time in case of high speed printing or different types of ink containing various dyes or pigments are used.
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