Mitsubishi Chemical Corporation

Mitsubishi Rayon Company, Limited

Yoshinobu Kotera

Yukio Onohara

Shima Nakanishi

Mitsutoshi Ochi

Masaki Sugiyama

A spinning nozzle which has a perforated part in which ejection holes have been arranged in a density as high as 600-1,200 holes/mm. This process for producing a fibrous bundle comprises ejecting a spinning dope having a viscosity as measured at 50&#xb0; C. of 30-200 P from the ejection holes of the spinning nozzle to produce a fibrous bundle. This fibrous bundle has a single-fiber fineness of 0.005-0.01 dtex. By the wet-process direct spinning, a mass of nanofibers which are stably uniform and continuous can be produced at a high efficiency.

Spinning nozzle, process for producing fibrous mass, fibrous mass, and paper

Process for producing a fibrous bundle via a spinning nozzle

An acrylic fiber having an irregular form section and a ramie-like feeling, wherein the section of the fiber has unmethodical surface unevenness and has at least two concave parts which has a ratio of the length l of a perpendicular from a tangental line between adjacent convex parts of said unevenness to the deepest part of the concave part to the diameter D.sub.1 of a circumscribed circle: l/D.sub.1 of 0.05 or more, and the surface of said fiber is covered with many discontinuous creases having an average width of 1.mu. or more provided along the lengthwise direction of the fiber, and process for producing the same.

Acrylic fibers having irregular-form section and process for producing

Growing community of inventors

Chiyoda-ku, Japan

Yoshinobu Kotera