Asahi Kasei Kogyo Kabushiki Kaisha

Toshio Iwasa

Akio Inoue

Tadahiro Kobayashi

Junji Nomura

Kiichiro Sasaguri

Hideo Sato

Masakazu Takamura

Yasuo Uchida

Kunitoshi Shimizu

Yoshihisa Shichijo

Toshihiko Amano

An extremely fine acrylic polymer fiber pile fabric, which comprises a substratum fabric impregnated with an elastic polymer and having at least one pile layer formed by raising at least one surface of said fabric, is characterized in that said piles consist essentially of extremely fine independent acrylic polymer fibers, each of which has a denier of 0.8 or less and is provided with a number of amorphous scale-shaped protuberances formed on the peripheral surface thereof, and which has been produced by a wet spinning method from an acrylic polymer containing at least 80% by weight of acrylonitrile.

Extremely fine acrylic polymer fiber pile fabric and process for

Provided is dried porous membrane composed of acrylonitrile polymer walls separating predominantly interconnecting small-size pores. The membrane has surface layers integrated with a support layer to form a single continuous acrylonitrile polymer phase. At least one of the surface layers has pores of from 0.001 to 0.05 micron in average size, and the support layer has pores which are on the average larger than the pores in the surface layer or layers. The membrane has a porosity of from 20% to 70% by volume and a fragility of below 30. The membrane exhibits improved mechanical properties.

Dried porous acrylonitrile polymer membrane, process for producing same

An acrylonitrile polymer film is produced by the steps of:

Process for producing acrylonitrile polymer film

Modacrylic fibers having excellent flameproof property and retaining the superior whiteness, heat-stability, etc. of Acrylonitrile polymer fibers are produced from the polymers containing, as principal components, 50 percent by weight or more of acrylonitrile, 25 percent by weight of more of vinylidene chloride and 0.1 - 3 percent by weight of bis(2-chloroethyl) vinylphosphonate, and if necessary, as additional component, at least one copolymerizable ethylenically unsaturated compound.

Flameproof modacrylic fibers

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Fuji, Japan

Toshio Iwasa