| 摘要 |
<p>A process for producing a high-whiteness hygroscopic fiber, characterized by subjecting an acrylic fiber made of an acrylonitrile polymer containing less than 5 wt% of (meth)acrylic acid esters as the comonomer component to crosslinking with a hydrazine compound, hydrolysis, and reduction. This process comprises (1) treating the acrylic fiber with a hydrazine compound to thereby introduce crosslinks and increase the nitrogen content by 1.0 to 10.0 wt%, (2) treating the resulting fiber with an aqueous solution of an alkaline metal salt to form 4.0 to 10.0 meq/g of metal salt type carboxyl groups through the hydrolysis of CN groups, and (3) reducing the obtained fiber with a reducing agent selected from the group consisting of hydrosulfite salts, thiosulfate salts, sulfite salts, nitrite salts, thiourea dioxide, ascorbate salts, and hydrazine compounds.</p> |
