Mitsubishi Rayon Company, Limited

Other

Yoshihiro Nishihara

Hiroshi Hosokawa

Seizo Oishi

Hajime Itoh

Yasuyuki Fujii

Gary J Capone

Naoto Ohsuga

Masako Iwamoto

Hiroaki Ohnishi

Charles W Emerson

Ryo Ochi

Hiroaki Yoneyama

Yoshifumi Furutani

Yasuji Inoue

Fumio Takemoto

Toshiyuki Yasunaga

Hideo Masaoka

Setsuo Hara

Masaaki Toramaru

There is disclosed a high-shrinkage acrylic fiber made of an acrylonitrile polymer comprising acrylonitrile in no less than 50% by weight, wherein a shrinkage rare after dry heating at 130&#xb0; C. for 10 min without load is 25 to 35% and a difference between the maximum and the minimum of a shrinkage rate after dry heating within a temperature range of 120 to 140&#xb0; C. for 10 min without load is 8% or less. There also provided a pile composition comprising the high-shrinkage acrylic in 20 to 80% by weight, and a pile fabric prepared from the pile composition.

Highly shrinkable acrylic fiber, pile compositions containing the same and napped fabrics made by using the compositions

The present invention is directed to chitosan-containing acrylic fibers having a total chitosan content of 0.05 to 2% by weight and an extractable chitosan content of not less than 0.03% by weight to less than the total chitosan content. The antimicrobial activity of the chitosan-containing acrylic fibers of the present invention can persist for a long period of time and is not deteriorated even when subjected to posttreatments, such as dyeing and bleaching of fibers, and treatments in usual service environments of fiber products, such as washing and ironing.

Chitosan-containing acrylic fibers and process for preparing the same

Process of making chitosan-containing acrylic fibers

Flat filaments have a flatness (A/B) of 7 to 25, where A is a length of at least one of the two longer sides of a substantially rectangular, transverse cross-section of each filament and B is a length of at least one of the two shorter sides of the substantially rectangular, transverse cross-section of each filament. The flat filaments also have a fineness of 0.5 to 40 denier, and are provided on each of the two longer sides with one or more ribs continuously extending in a direction of an axis of the filament and having a width W and a height H. The number of the ribs on each longer side ranges from 1 to A/2W, the rib width W ranges from B/2 to 3B, and the rib height H ranges from B/2 to 2B. The filaments have excellent nontackiness and bulkiness and permit easy elimination of crimps by polishing, and can be suitably used as raw fibers which, when formed into a pile product, provide the pile product not only with a soft feeling but also with resilient and substantial feeling.

Flat filaments provided with ribs and raw fibers for pile fabrics

Carbon based porous hollow fiber membrane and method for producing same

A process for producing an acrylic fiber comprising the steps of: (a) dissolving a polymer having a weight-average molecular weight of at least 5.times.10.sup.5 and containing at least 80 wt. % acrylonitrile in a solvent comprising dimethylformamide or dimethylacetamide at a polymer concentration of 5-15 wt. % to provide a spinning solution having a viscosity of 500-1,500 poises at 45.degree. C.; (b) extruding the solution into a gaseous medium to form filaments; (c) introducing the filaments into a coagulation bath comprising water and at least one of dimethylformamide and dimethylacetamide at 0.degree. C. or below; and (d) stretching the coagulated filaments to a draw ratio of at least 3 to provide an acrylic fiber having at least 90% X-ray orientation and an X-ray crystallinity parameter of up to 1 degree. The resulting acrylic fiber has high strength and high modulus.

Process for producing an acrylic fiber having high fiber characteristics

Growing community of inventors

Otake, Japan

Yoshihiro Nishihara