Asahi Kasei Kogyo Kabushiki Kaisha

Toyo Jozo Company, Ltd.

Asahi Kasei Kogyo Kabushiki

Yasuo Yokokawa

Tokio Nishikawa

Shigeyasu Ohashi

Masataka Morishita

Mitsuru Fukushima

Yoshihito Inaba

Mashahiro Mishiro

Tetsuo Matsuda

Tutomu Sasagawa

Satoshi Araragi

Masahiro Mishiro

Narumi Yoshida

Hachiro Uchiyama

The invention concerns a membrane filtration type hollow fiber. It is composed of a single material phase which material is a chain high polymer and capable of forming fibers by the spinning of the high polymer. The cylindrical wall defining the hollow fiber represents a three-dimensional net-like structure of fine filtering passages of 0.05 to 1 micron, preferably 0.1 to 1 micron. This structure occupies substantially the whole mass of the tubular wall or a closed ring band zone when seen in any cross-section of the wall, providing thus an effective and active filtering zone. The pore rate amounts to at least 55%, and active points of the filtering passages for governing minimum passable sizes of the passages for solids included in a filtering liquor to be treated upon are distributed at random throughout at least the active zone. These sizes are nearly uniform.

Membrane filtration type hollow fibers

The invention concerns a membrane filtration type hollow fiber. It is composed of a single material phase which material is a chain high polymer such as cellulose acetate and capable of forming fibers by the spinning of the high polymer. The cylindrical wall defining the hollow fiber represents a three-dimensional net-like structure of fine filtering passages. This structure occupies substantially the whole mass of the tubular wall or a closed ring band zone when seen in any cross-section of the wall, providing thus an effective and active filtering zone. The pore rate amounts to at least 55%, and active points of the filtering passages for governing minimum passable sizes of the passages for solids included in a filtering liquor to be treated upon are distributed at random throughout at least the active zone. These sizes are nearly uniform.

Membrane filtration type hollow fibers and method for the preparation of

A cellulose microcapsule having absorbing capacity, consisting of outer semipermeable barrier layer of cellulose and absorbent powders dispersed within inner cellulose gel matrix is prepared by dispersing adsorbent powders in a solution of cellulose dissolved in a solvent which is not adversely affected by the adsorbing capacity of adsorbent powders and capable of dissolving cellulose, then forming the dispersion into droplets and finally precipitating cellulose on the droplets. It is excellent in resistance to chemicals such as acids, alkalis or organic solvents and is useful for various purposes.

Process for producing cellulose microcapsules, and resulting cellulose

A novel cellulose microcapsule having adsorbing capacity, consisting of outer semipermeable barrier layer of cellulose and adsorbent powders dispersed within inner cellulose gel matrix, is prepared by ester hydrolysis of a precursor microcapsule consisting of cellulose ester derivative and adsorbent powders. It is excellent in resistance to chemicals such as acids, alkalis or organic solvents and is useful for various purposes.

Novel cellulose microcapsules and preparation thereof

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Tokyo, Japan

Yasuo Yokokawa