| 摘要 |
A mat type recording medium for ink jet printing is provided which exhibits optimum printability no matter which of dye ink and pigment ink may be used in printing. The recording medium, which is for recording with use of water-based ink containing an ink colorant, comprises a paper base and an ink receptive layer formed on a surface of the paper base, the ink receptive layer comprising a porous layer containing an inorganic pigment and also containing a substance reactive with the ink colorant. The recording medium is characterized in that a droplet of 4 mul distilled water dropped onto a surface of the ink receptive layer is absorbed in a first absorbing stage of absorbing the droplet at a first absorbing speed V 1 (mul/sec) within one second after the dropping, a second absorbing stage of absorbing the droplet at a second absorbing speed V 2 (mul/sec) after the first absorbing stage, and a third absorbing stage of absorbing the droplet at a third absorbing speed V 3 (mul/sec) after the second absorbing stage, the droplet absorption in the first to third absorbing stages satisfying the relationships of 0<V 2 <V 1 and 0<V 2 <V 3, and given that an inflection point from the first to the second absorbing stage is a, an inflection point from the second to the third absorbing stage is b, a final point of the third absorbing stage is c, absorption quantities at the points a, b and c are qa, qb and qc, respectively, and the times up to the points a, b and c are ta, tb and tc, respectively, the absorption quantity qa at the inflection point, a, is not smaller than 1.3 mul and smaller than 2.0 mul, and the absorption quantity qb at the inflection point, b, is not smaller than 2.0 mul and smaller than 2.5 mul.
|
