Nippon Paper Industries Co., Ltd.

Dai Nagahara

Takashi Ochi

Shisei Goto

Toru Nakatani

Koji Kutsuwa

Koichi Yanai

Masatoshi Oishi

Akinobu Chatani

Yuji Ozawa

Koji Ninagawa

Katsumasa Ono

Kunio Takebayashi

Kazuyuki Fujita

Kazunari Soga

The present invention provides a titanium oxide composite fiber in which titanium oxide is efficiently fixed in fiber, and a method for producing the titanium oxide composite fiber. A composite fiber of the present invention includes: fiber; titanium oxide; and an inorganic binder, at least part of the inorganic binder containing at least one inorganic compound selected from (i) an inorganic salt containing at least one of: at least one metal selected from magnesium, barium, aluminum, copper, iron, and zinc; and silicic acid and (ii) metal particles containing the at least one metal, the titanium oxide being firmly fixed to the fiber via the inorganic binder.

Titanium oxide composite fibers and method for producing same

A method for manufacturing an inkjet recording medium comprising the steps of: applying a coating color containing a pigment and a binder as major components to at least one side of a base material using a transfer roll coater, subsequently drying coating layer to form an ink absorbing layer, wherein Hercules viscosity of coating color is 5 m Pa&#xb7;s to 30 m Pa&#xb7;s and pigment contains a synthetic silica having an oil absorption of 90 ml/10 g to 200 ml/100 g, a BET specific surface area of 45 m/g to 200 m/g and an average particle diameter of 1.0 &#x3bc;m to 3.0 &#x3bc;m and/or a precipitated calcium carbonate-silica composite having an oil absorption of 100 ml/10 g to 250 ml/100 g, a BET specific surface area of 5 m/g to 150 m/g and an average particle diameter of 1.0 &#x3bc;m to 10 &#x3bc;m.

Process for producing inkjet recording medium

The present invention provides a low-density neutral paper offering excellent opacity, opacity after printing and other advantageous printability properties despite high bulk, by containing, as a filler, precipitated calcium carbonate-silica composite having an average particle size of 30 &#x3bc;m or less and produced by neutralizing a mixture of precipitated calcium carbonate and alkaline silicate to pH 7 to 9, wherein the ratio of precipitated calcium carbonate to silica (precipitated calcium carbonate/silica) is 30/70 to 70/30 in solid content by weight and the surface of precipitated calcium carbonate particles is covered with silica. In particular, the present invention provides a low-density printing paper, or an electrophotographic transfer paper offering excellent stiffness and copier suitability, by means of adjusting the filler content in paper to a range of 1 to 25 solid content percent by weight, or provides a neutral newsprinting paper by means of adjusting the filler content in paper to a range of 0.1 to 25 solid content percent by weight.

Low-density neutral paper

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Tokyo, Japan

Dai Nagahara