IMPROVED DYEINGS OF VINYLON BY SULFOACETALIZATION

The dyeing of synthetic fibers is generally diffcult especially vinylon.Dyeing, of vinylon with cationic dyes, used widely in dyeing acrylic fibers, was experimented.Vinylon acetalized with p-sulfobenzaldehyde was dyed with basic dyes. Excellent results were obtained for the vinylon acetalized by using hydrochloric acid as the catalyst, but not for the vinylon acetalized using sulfuric acid.It seems that sulfuric acid as the catalyst is not so effective as hydrochloric acid in acetalizing vinylon with p-sulfobenzaldehyde, but it does react on vinylon, offering a high coloring property.Good deep-dyeing was obtained with cationic dyes when the degree of acetalization is higher than a unity.