ULTRAFINE FIBER EXCELLENT IN COLOR DEVELOPMENT AND COLORFASTNESS TO LIGHT AND ITS PRODUCTION

摘要

PURPOSE:To produce the subject ultrafine fiber excellent in color development and colorfastness to light by preliminarily dyeing an ultrafine fiber with a red- and/or blue-color pigment and subsequently dyeing the fiber with a dye of a color tone different from that of the above-mentioned pigment. CONSTITUTION:The objective ultrafine fiber excellent in color development and colorfastness to light is produced by preliminarily coloring a polymer (preferably polyester-based polymer) with a red- and/or blue-color pigment, spinning it into an ultrafine fiber of <=1d and dyeing the resultant ultrafine fiber with a dye (preferably yellow-color dye excellent in colorfastness to light) of a color tone different from that of the above pigment. The objective ultrafine fiber may be produced by dyeing a conjugated fiber containing the core component composed of a water-insoluble polymer (preferably polyester-based polymer) colored with a red- and/or blue-color pigment and the matrix component (sea component) composed of a water-soluble polymer (e.g. polyester-based polymer synthesized by using 5-sodium sulfoisophthalate as a comonomer unit) with a different-color tone dye (preferably yellow dye excellent in colorfastness to light). The obtained ultrafine fiber is suitable for a car seat material.