| 摘要 |
PURPOSE:To efficiently obtain the subject fiber having soft feeling, by passing an acrylic polymer containing carboxylic acid groups and other acrylic polymers through a device for forming many layers, dividing the polymers into layers, spinning the polymers and treating the resultant fiber with an alkaline solution. CONSTITUTION:(A) A carboxylic acid group-containing vinyl monomer, such as crotonic acid, in an amount of preferably 1-17mol% (based on the total monomers) is copolymerized with acrylonitrile to provide (A) a carboxylic acid group-containing acrylic polymer. The resultant polymer and (B) other acrylic polymers containing preferably >=80mol% acrylonitrile are then passed through a device for forming many layers, divided and spun so as to provide >=3 number of theoretical layers expressed by the formula (K is a constant dependent on the contour shape of a spinneret), subsequently passed through (C) an alkaline solution, such as sodium carbonate, subjected to swelling treat ment and treated with (D) a dissolvent, such as caustic soda, to dissolve the component (A). Thereby, the aimed fiber is obtained. |
