An improved copolyester fiber capable of being dyed with cationic dyes and having an excellent brightness, heat resistance and a satisfactory mechanical strength comprises a copolyester resin comprising a polymerization product of at least one aromatic dicarboxylic acid compound, at least one alkylene diol compound and at least one quaternary phosphonium organic sulfonate of the formula (I):
wherein A = an aromatic or aliphatic radical, XI = H or an ester-forming organic radical, X2 = an ester-forming organic radical, R1, R2, R3 and R4 = an alkyl or aryl radical, n = 1 or more, and having an [η]f of 0.5 or more, the copolyester fiber having a silk factor of 25 or more and exhibiting the number of scission of backbone chains of the copolyester molecules of 140 x 1023 or less per 106 g of fiber when wet heat-treated in a solution of 0.4 g/I of acetic acid in distilled water at 130°C for 60 minutes.
一种改进的共聚聚酯纤维,能用
阳离子染料染色,并具有极佳的亮度、耐热性和令人满意的机械强度,它包括一种共聚聚酯
树脂,该
树脂由至少一种芳香族二
羧酸化合物、至少一种亚烷基二元醇化合物和至少一种式(I)的季
鏻有机
磺酸盐的聚合产物组成:
其中 A = 芳族或脂族基,XI = H 或形成酯的有机基,X2 = 形成酯的有机基,R1、R2、R3 和 R4 = 烷基或芳基,n = 1 或更多,且[η]f 为 0.5 或更多,该共聚聚酯纤维的丝系数为 25 或更多,在 0.4 g/I 的
乙酸在蒸馏
水中的溶液中于 130℃湿热处理 60 分钟时,每 106 克纤维的共聚聚酯分子骨架链的断裂数为 140 x 1023 或更少。