Cellulose acetate fiber having non-circular cross section, multi-filaments thereof, and process for the production thereof

Abstract

A cellulose acetate fiber excellent in gloss and feeling, formed from a mixture which consists essentially of (a) 100 parts by weight of cellulose acetate and (b) 5 to 40 parts by weight of a polymer substance which can plasticize the cellulose acetate, wherein, in a cross-sectional form at right angles with the lengthwise direction of the fiber, (i) the cross-sectional form is non-circular, (ii) the cross-sectional form has 1 to 4 axes of symmetry, and (iii) the cross-sectional form has a contour formed of smooth curves or formed of smooth curves and straight lines. The above cellulose acetate fiber can be produced by dry-spinning a spinning dope consisting essentially of (a) 100 parts by weight of cellulose acetate, (b) 5 to 40 parts by weight of a polymer substance which is soluble in solvent and can plasticize the cellulose acetate, and (c) a solvent which can dissolve the above (a) and (b).

Dependencies are inferred from the claim text.