Toa Nenryo Kogyo Kabushiki Kaisha

Asahi Kogaku Kogyo Kabushiki Kaisha

Toa Nenryo Kogyo, K. K.

Shoichi Mori

Jyoichi Tabuchi

Kenji Miyasaka

Koichi Kono

Shigeo Fujii

Sumiaki Tsuru

Noriko Komatsu

Masao Yoshizawa

Kazufumi Egawa

Minoru Hirano

Yoshikazu Yoshida

A nonwoven fabric consisting of water-soluble resin fine fibers having a mean fiber diameter of at most 30 .mu.m and a basis weight of 5 to 500 g/m.sup.2 is produced by extruding an aqueous solution containing a water-soluble resin or a melt of a water-soluble resin plasticized with water through nozzles, stretching the extruded material to form fibers by a high speed gas flow, heating the fibers to evaporate the water in the fibers and then collecting the fibers.

Nonwoven fabric of water-soluble resin fibers

A fibrous bone filler having an excellent biocompatibility. The bone filler comprises fibers containing hydroxyl apatite. The hydroxyl apatite is 'intact', that is, the hydroxyl apatite substantially retains its hydroxyl groups.

Fibrous bone filler and process of producing the same

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.

Cell separator device

A micro-porous membrane of ultra-high-molecular-weight alpha-olefin polymer having a weight-average molecular weight greater than 5.times.10.sup.5, the micro-porous membrane having through holes 0.01 to 1 micrometer in average pore size, with a void ratio from 30 to 90% and being oriented such that the linear draw ratio in one axis is greater than two and the areal draw ratio is greater than ten. The micro-porous membrane is obtained by forming a gel-like object from a solution of an alpha-olefin polymer having a weight-average molecular weight greater than 5.times.10.sup.5, removing at least 10 wt % of the solvent contained in the gel-like object so that the gel-like object contains 10 to 90 wt % of alpa-olefin polymer, orientating the gel-like object at a temperature lower than that which is 10.degree. C. above the melting point of the alpa-olefin polymer, and removing the residual solvent from the orientated product. A film is produced from the orientated product by pressing the orientated product at a temperature lower than that of the melting point of the alpha-olefin polymer.

Process for producing micro-porous membrane of

The present invention provides a fibrous product of apatite comprising one or more apatites selected from a group of apatites represented by the general formula:

Fibrous apatite and method for producing the same

A polyethylene microporous membrane having a thickness of at most 10 .mu.m, a breaking strength of at least 200 kg/cm.sup.2 and a porosity of at least 30% is produced by heating and dissolving polyethylene having a weight average molecular weight of at least 5.times.10.sup.5 in a solvent, forming a gel sheet from the resulting solution, subjecting the gel sheet to a solvent removal treatment to adjust the amount of the solvent in the gel sheet to 10 to 80% by weight, heating and stretching the sheet and then removing the residual solvent therefrom.

Polyethylene microporous membrane and a process for the production of

A polyethylene superthin film having a thickness of at most 3 .mu.m, a tensile modulus of at least 2000 kg/cm.sup.2, a breaking strength of at least 500 kg/cm.sup.2 and a haze of at most 10% is produced by heating and dissolving polyethylene having a weight average molecular weight of at least 5.times.10.sup.5 in a solvent, forming a gel sheet from the resulting solution, subjecting the gel sheet to a solvent removal treatment to adjust the amount of the solvent in the gel sheet to 10 to 80% by weight, heating and stretching the sheet, removing the residual solvent therefrom and then subjecting the stretched product to a compressing treatment at a temperature of at most the melting point of the polyethylene.

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Ooi-machi, Japan

Shoichi Mori