Asahi Kogaku Kogyo Kabushiki Kaisha

Bestex Kabushiki-kaisha

Asahi Kogaku Kogyo K.k.

Toa Nenryo Kogyo, K. K.

Kabushikigaisha Ars Japan

Sumiaki Tsuru

Akihiko Yokoo

Masahiro Sato

Tetsuro Ogawa

Takeshi Ichitsuka

Toru Nakajima

Katsuhiko Nishimura

Takeshi Sakurai

Shigeo Fujii

Shoichi Mori

Tsuneo Hiraide

Noriko Komatsu

Tooru Nakajima

Masashi Tsugita

Ken Takasaki

Ichiro Masuno

A filtering material employable as a basic material for a sanitary mask, a deodorizing filter or the like includes as essential components calcium phosphate particles, a water soluble glucan and a sheet-shaped raw material, and the calcium phosphate particles are caused to adhere to the sheet-shaped raw material with the aid of the water soluble glucan serving as a binder. A method of a filtering material is typically practiced by way of a first step of dispersing a predetermined quantity of calcium phosphate particles and a predetermined quantity of water soluble glucan in water to prepare an aqueous treatment solution, a second step of dipping a sheet-shaped raw material in the aqueous treatment solution and taking up the sheet-shaped raw material coated with the aqueous treatment solution and a third step of drying the sheet-shaped raw material coated with the aqueous treatment solution. The method of producing a filtering material may be practiced by way of a first step of dissolving a predetermined quantity of water soluble glucan in water to prepare an aqueous preliminary treatment solution, a second step of adhering the aqueous preliminary treatment solution to a sheet-shaped raw material, a third step of adhering calcium phosphate particles to the sheet-shaped raw material before the sheet-shaped raw material having the aqueous preliminary treatment solution adhering thereto is completely dried, and a fourth step of drying the sheet-shaped raw material.

Filtering material and method of producing the same

Deodorant comprising 5 to 100% by weight of a calcium phosphate compound having a molar ratio of Ca/P of 0.8 to 2.0, a deodorant sheet and filter sheet containing such calcium phosphate compound, and a functional paper containing 10 to 80% by weight of a calcium phosphate compound. A filtering medium for an exhaust gas comprises a ceramic material containing 5 to 100% by weight of a calcium phosphate compound, as well as a filter cartridge and exhaust gas filter containing the filtering medium. Based on the excellent properties of the incorporated calcium phosphate compound, the agents and products according to the present invention exhibit a highly improved adsorptivity to oil-soluble substances, odor substances, animal or vegetable cells, viruses, biopolymeric substances or other substances, and therefore can be advantageously used in various fields of technology. For example, the functional paper can be used as a deodorant, filter medium and adsorbent as well as a flame-retardant paper. The filtering medium, filter cartridge and filter can be used in an exhaust system to purify an exhaust gas produced therein.

Deodorants and gas filters therefor

Deodorants, deodorant sheets, filter sheets and functional papers as

To produce a filtering material for adsorptively capturing very fine particles such as fungus, pollen, virus, bacteria or the like at a high efficiency, an aqueous treatment solution is first prepared by dissolving porous apatite particles of 0.5 to 40% by weight, preferably, 0.5 to 30% by weight and a water soluble glucan of 0.5 to 15% by weight in water. A sheet-shaped raw material is then coated with the treatment solution with the aid of a rotating drum of which part is always dipped in the treatment solution, and thereafter, the sheet-shaped raw material having the treatment solution coated thereon is dried. Alternatively, an aqueous treatment solution prepared by dissolving only a water soluble glucan of 0.5 to 25% by weight in water may be substituted for the aforementioned aqueous treatment solution. In this case, after a sheet-shaped raw material is coated with the treatment solution, porous apatite particles are deposited on the sheet-shaped raw material by employing a dispersing process or a spraying process before the treatment solution coated on the sheet-shaped raw material is kept still wet. Subsequently, the sheet-shaped raw material having the treatment solution coated thereon and the porous apatite particles deposited thereon is dried.

Method of producing a filtering material

Disclosed is a drug-releaser comprising a porous body of biocompatibility filled with a medicine. Specifically, such porous body is made of baked calcium phosphate, 2-hydroxyethylmethacrylate, chitin, chitosan or their delivatives. Implantation or artery-injection of such drug-releaser causes a discernible curing effect on affected parts of the living body without causing any irritativeness. The steady release of the medicine from HAP particles to affected parts and the blockade of surrounding capillary vessels leading to such affected parts causes a remarkable tumor inhibitory effect.

Drug-releaser

A filtering material for effectively adsorbing not only conventional foreign material such as dust, odoring gaseous substance but also very fine foreign material such as virus, bacteria, fungus, pollen or the like is disclosed. The filtering material includes as essential components porous apatite particles, a water soluble glucan and a sheet-shaped raw material in which the porous apatite particles are included with the aid of the water soluble glucan serving as a binder. A method of producing a filtering material of the foregoing kind is practiced by way of a step of preparing an aqueous treatment solution in which porous apatite particles of 0.5 to 40% by weight and a water soluble glucan of 0.5 to 15% by weight are dispersively dissolved, a step of immersing a sheet-shaped raw material in the aqueous treatment solution, and a step of drying the sheet-shaped raw material while the porous apatite particles are included in the sheet-shaped raw material with the aid of the water soluble glucan serving as a binder. Alternatively, a step of spraying the aqueous treatment solution to surfaces of a sheet-shaped raw material may be substituted for the step of immersing a sheet-shaped raw material in the aqueous treatment solution. It is preferable from the viewpoint of practice use that the porous apatite particles make up between 0.5 and 30% of the treatment solution.

Filtering material of apatite and glucan used for surgical masks and

A sintered hydroxycalcium apatite body having an average particle size of 50-2,000 .mu.m is used to form a packing in a cell separating column for use in separating groups or populations of cells from a suspension of animal cells.

Medium, apparatus and method for cell separation

A separating agent which includes a polyvinyl acetal resin having open cell structure and an average pore size of from about 10 to about 1000 micrometers; and, porous calcium phosphate granules having open cell structure, and also having two distributions of pore size wherein one distribution has micropores ranging from about 20 to about 500 nm in average pore size and the other distribution has small pores ranging from about 1 to about 50 micrometers in average pore size. Alternatively, the separating agent includes a polyvinyl acetal resin having open cell structure and having an average pore size of from about 10 to about 1000 micrometers as a first element, and a layer of porous calcium phosphate granules having an average granule size of from about 10 to about 2000 micrometers as a second element applied onto the first element. The separating agents may be used in a separator, and may be employed in separating methods. The separating agents, separator, and separating methods can be advantageously used to isolate a target cell or virus from a biological fluid in the fields of medical science and biochemistry. The distribution of target cell or virus subsets is not altered by the separation.

Separating agent, separator and method of separating cell or virus

Slow release drug delviery granules comprising porous granules of a calcium phosphate compound having an atomic ratio of Ca to P of 1.3 to 1.8, a porosity of 0.1 to 70%, a specific surface area of 0.1 to 50 m.sup.2 /g and a pore size of 1 nm to 10 .mu.m, fired at a temperature of 200.degree. to 1400.degree. C., and a drug component impregnated in pores of the granules, and a process for producing the same. The drug delivery granules of the present invention have a controllable, prolonged effect of drug release and a good imaging property to an X-ray or ultrasonic wave, and therefore can be advantageously utilized in the field of chemotherapy.

Slow release drug delivery granules and process for production thereof

A cell separator which can separate cells, especially lymphocytes, with high selectivity and high efficiency without changing the cell population ratio of the cells. The cell separator comprises fibrous material containing fibers including hydroxyl apatite.

Growing community of inventors

Tokyo, Japan

Sumiaki Tsuru