抄録
Studies were carried out on the relation between manufacturing conditions of the fibers made of modified polyvinyl alcohol partially dimethylaminoacetalized in powder form and their dyeability. The partially dimethylaminoacetalized polyvinyl alcohols were mixed with polyvinyl alcohol and dry spun. With these fibers, the dyeability was tested.
It is found that the dyeability of the fibers by acid dyestuffs depends not only on the degree of dimethylaminoacetalization of the samples, but on the draw ratio and the heat-treatment temperature. of the fibers. Consequently, the dyeability is considered to be affected by the number of the sites for dyestuffs and the structure of the fiber. However, these fibers were not so much affected the dyeability by the change in formalization condition in spite of the usual fact that the dyeability of the conventional polyvinyl alcohol by direct, acid and dispersed dyestuffs is quite affected by the formalization conditions. So it is advantageous industrially to use partially dimethylaminoacetalized polyvinyl alcohol as material for dry spinning.
