POLYIMIDE NONWOVEN FABRIC AND PROCESS FOR PRODUCTION THEREOF

Title:

POLYIMIDE NONWOVEN FABRIC AND PROCESS FOR PRODUCTION THEREOF

Document Type and Number:

WIPO Patent Application WO/2007/148674

Kind Code:

A1

Abstract:

The invention provides a nonwoven fabric which exhibits excellent heat resistance, mechanical strength and dimensional stability under heat even in applications accompanied with the exposure to high temperature and has an extremely large surface area and high filter performance. The fabric is made of polyimide fibers which are prepared from a raw material comprising as the essential components an aromatic tetracarboxylic acid and antissu non tissé de péo aromatic diamine having a benzoxazole structure through polycondensation and have fiber diameters of 0.001 to 1μm. This fabric can be produced by a process which comprises the step of forming a polyimide precursor nonwoven fabric by charge-spinning a polyamic acid prepared from a raw material comprising as the essential components an aromatic tetracarboxylic acid and an aromatic diamine having a benzoxazole structure through polycondensation and the step of subjecting the polyimide precursor fibers constituting the obtained precursor nonwoven fabric to imidation.

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Inventors:

NAKAMORI, Masahiko (1-1 Katata 2-chom, Ohtsu-shi Shiga 92, 5200292, JP)
中森雅彦 (〒92 滋賀県大津市堅田二丁目１番１号東洋紡績株式会社内 Shiga, 5200292, JP)
MAEDA, Satoshi (1-1 Katata 2-Chom, Ohtsu-shi Shiga 92, 5200292, JP)
前田郷司 (〒92 滋賀県大津市堅田二丁目１番１号東洋紡績株式会社内 Shiga, 5200292, JP)
KITAGAWA, Tooru (1-1 Katata 2-Chom, Ohtsu-shi Shiga 92, 5200292, JP)

Application Number:

JP2007/062277

Publication Date:

December 27, 2007

Filing Date:

June 19, 2007

Export Citation:

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Assignee:

TOYO BOSEKI KABUSHIKI KAISHA (2-8 Dojima Hama 2-chome, Kita-ku Osaka-shi Osaka, 30, 5308230, JP)
東洋紡績株式会社 (〒30 大阪府大阪市北区堂島浜二丁目２番８号 Osaka, 5308230, JP)
NAKAMORI, Masahiko (1-1 Katata 2-chom, Ohtsu-shi Shiga 92, 5200292, JP)
中森雅彦 (〒92 滋賀県大津市堅田二丁目１番１号東洋紡績株式会社内 Shiga, 5200292, JP)
MAEDA, Satoshi (1-1 Katata 2-Chom, Ohtsu-shi Shiga 92, 5200292, JP)
前田郷司 (〒92 滋賀県大津市堅田二丁目１番１号東洋紡績株式会社内 Shiga, 5200292, JP)

International Classes:

D04H1/42; B01D39/16; D04H1/72; D04H1/42; B01D39/16; D04H1/70

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