Nittetsu Mining Co., Ltd.

Katsuyuki Tanabe

Kouhei Mitsuhashi

Kohei Mitsuhashi

Hideki Fujikawa

Naoki Tagami

Masaharu Umebayashi

Takehiko Yoshida

Atsushi Ugomori

Seiji Asaba

Basic magnesium carbonate comprising a tubular aggregated particle of flaky fine crystals.

Basic magnesium carbonate, production method and use of the same

Silica-calcium carbonate composition particles having the characteristics of both synthetic silica and calcium carbonate are described along with paper having the particles internally filled therein and a method for making the particles. In the carbonation reaction, which typically involves a step of forming calcium carbonate, while agitating a calcium hydroxide slurry, a mixed gas of carbon dioxide and air is introduced thereinto and synthetic silica, such as colloidal silica or the like, is added before the carbonation rate arrives at 95% but after commencement of the carbonation reaction, followed by further introduction of the mixed gas to continue the carbonation reaction and completion of the carbonation reaction at the time when the pH of the slurry reaches 7, thereby providing the composite particles.

Silica-calcium carbonate composite particles

Titanium dioxide-calcium carbonate composite particles capable of realizing characteristic properties inherent in titanium dioxide such as a high opacity, a process for producing the same, and a complex composition or complex incorporated with the same are provided. The composite particles were prepared by adding titanium dioxide particles having an average particle diameter of 0.1 to 0.5 &#x3bc;m in a carbonation step, typically a step of introducing a gaseous mixture of carbon dioxide and air into a calcium hydroxide slurry with stirring, to conduct a carbonation, and continuing the reaction till pH of the slurry becomes 7 by continuous introduction of the gaseous mixture. Moreover, by incorporating the formed composite particles, complexes such as coatings and paints for paper making or composite materials such as paper, plastic molded materials, and rubber molded materials are produced.

Titanium dioxide-calcium carbonate composite particles

An antibacterial titania comprising a titania to which ions of an antibacterial metal are adhered, wherein the antibacterial metal is silver; and the antibacterial titania further contains chlorine at a Cl/Ag molar ratio in a range of from 2.8 to 7.2. A process for producing an antibacterial titania which comprises the steps of: (1) incorporating a salt of an antibacterial metal into a slurry of metatitanic acid to adhere ions of the antibacterial metal to titania in the metatitanic acid slurry; and (2) adding a source of chlorine ions to the slurry, wherein the antibacterial metal is silver.

Antibacterial titania and process for producing the same

In order to provide a filler for degradable plastics which can simplify the stages for producing a degradable plastic, give effective plastic-degradability, and stabilize the quality of the plastic article, the filler is used as a carrier substance and effective biodegradable and/or photodegradable components are adsorbed on the surfaces of the filler particles via a surface treating agent.

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Nishitama-gun, Japan

Katsuyuki Tanabe