@ A process for preparing α,ω-bis(2-chtorophenoxy)-alkane-4,4'-dicarboxylic acid or its lower alkyl ester useful as a starting material for producing polyester fibers or films having high modulus of elasticity and excellent self- extinguishing characteristics, which comprises reacting α,ω-bis(phenoxy)alkane-4,4'-dicarboxylic acid or its ester with chlorine in the presence of at least one member selected from amoung C2-6 lower fatty acids. C1-8 chlorinated hydrocarbons, and C1-2 chlorinated carbons.
一种制备α,ω-双(2-
氯苯氧基)-烷-4,4'-二
羧酸或其低级烷基酯的工艺,可用作生产具有高弹性模量和优异自熄特性的聚酯纤维或薄膜的起始材料,该工艺包括在至少一种选自 C2-6 低级
脂肪酸、C1-8
氯化碳氢化合物和 C1-2
氯化碳化物的成员存在下,使α,ω-双(苯氧基)-烷-4,4'-二
羧酸或其酯与
氯反应。C1-8
氯化碳氢化合物和 C1-2
氯化碳。