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US 6,632,488 B2Granted
Ink jet recording material
AssigneeOji Paper Co., Ltd.
InventorsYoshitaka Okumura, Takaaki Kohro, Yoshiharu Kawashima, Hiromasa Kondo
Life of this patent
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Abstract
An ink jet recording material which includes a paper sheet substrate and an ink receiving layer containing a xerogel porous pigment and has excellent ink-absorption and reproducibility of ink images with high clarity and precision, exhibits a water-dipping expansion of 0.3% or less, determined by the same method as the JAPAN TAPPI No. 27-B method except that the length of the recording material immersed in water is measured 15 seconds after the start of the immersion.
Claims8
An ink jet recording material comprising a paper sheet substrate;
- and
- an under recording layer coated on the paper sheet substrate and comprising a mixed pigment comprising 25 to 75% by weight of a xerogel silica porous pigment in the form of fine particles having a BET specific surface area of 100 m2/g or more and 75 and 25% by weight of a non-xerogel calcium carbonate pigment in the form of particles having a BET specific surface area of 100 m2/g or less, and a binder;
- and
- an upper recording layer coated on the under recording layer and comprising a pigment consisting of xerogel silica porous pigment particles and a binder,
- the ink jet recording material exhibiting a water-dripping expansion of 0.3% or less, determined in accordance with the same method as the JAPAN TAPPI No. 27-B method, except that the length of the recording material immersed in water is measured 15 seconds after the start of the immersion.
2 more elements
Dependencies are inferred from the claim text.