Patent ID: 9334608
Filing Date: 2016-05-10
CPC Classification: A41D,D01D,D01F,D03D,D04B,D06M,D10B,Y10T

Claim Text:
1. A polyester fiber comprising a polyester, characterized in that the polyester fiber has a pH of 4.0 to 6.6 and the polyester fiber is hydrophilized and a single-fiber fineness of the polyester fiber is 0.001 to 1.5 dtex and the polyester fiber contains a polyester copolymerized with an ester-forming metal sulfonate compound represented by the following general formula (1) and/or an ester-forming phosphonium sulfonate compound represented by the following general formula (2): wherein A1 represents an aromatic group or an aliphatic group, X1 represents an ester-forming functional group, X2 represents an ester-forming functional group the same as or different from X1 or a hydrogen atom, M represents a metal, and m represents a positive integer; wherein A2 represents an aromatic group or an aliphatic group, X3 represents an ester-forming functional group, X4 represents an ester-forming functional group the same as or different from X3 or a hydrogen atom, R1, R2, R3, and R4 represent the same or different groups selected from the group consisting of alkyl and aryl groups, and n represents a positive integer.