| 摘要 |
PROBLEM TO BE SOLVED: To obtain the subject fiber which has improved alkali hydrolysis resistance and improved light resistance, has excellent dyeability with cation dyes and disperse dyes and is suitable for blending or the like by spinning a polyester copolymerized with a specific aliphatic glycol component having a side chain. SOLUTION: This fiber comprises a polyester copolymerized with a side chain-having 6-25C aliphatic glycol component such as 3,3-dimethyl-1,2-butanediol preferably in an amount of 0.1-50 mol.%. The aliphatic glycol component is preferably an alkylene oxide adduct. The polyester is preferably copolymerized with one or more kinds of components selected from the group consisting of a dicarboxylic acid component, a glycol component and a polyoxyalkylene glycol component in addition to the side chain-having 6-25C aliphatic glycol component, and is preferably further copolymerized with a cation dye-dyeing site component preferably in an amount of 0.1-10 mol.% based on all the acid components.
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