Taiho Industries Co., Ltd.

Seiko Epson Corporation

Tetsuya Ochiai

Kenji Kawada

Hideo Yamazaki

Yoshiyuki Ozawa

Kousuke Okura

This invention provides an alumina dispersant mainly comprised of a nitrogen-containing monocarboxylic acid, an alumina dispersion liquid comprised of alumina particles dispersed well in an aqueous dispersing medium, a treating agent for use in making inkjet-printing materials, comprised of the alumina dispersion, and the inkjet-printing materials prepared by using the treating agent to have a high glossiness, high absorption, high water resistance, high reproducibility and good roundness of dots.

Alumina dispersant, alumina dispersion liquid, agent for treating inkjet-printing materials, and inkjet-printing materials

A recording medium is provided which causes none of bleeding or feathering, cracking and whitening of a print and is suitably usable especially for ink jet recording. The recording medium, when used in a system where an image is viewed by taking advantage of transmitted light, such as a system using an OHP sheet, can realize a good image having high light transmittance and high brightness. The recording medium comprises a substrate bearing an ink-absorbent layer, the ink-absorbent layer being formed of a polymer complex of a basic polymer and a styrene/(meth)acrylic acid polymer, the mixing ratio of the basic polymer and the styrene/(meth)acrylic acid polymer being in the range of from 10:3.5 to 7.

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Fujisawa, Japan

Tetsuya Ochiai