Studies on the Vapour Phase Acetylaton of Cellulose.(VI)：Stabilization of the ripening dope for its direct spinning.

摘要

Cellulose triacetate, which is made by the vapour phase method using ZnCl2 catalyser, may be dissolved in acetic acid．containing ZnCl2 and directly spun after or without dope-ripening. In this experiment, a market secondary acetate was dissolved into dope solutions and the changes of the degree of acetylation or poIymerisation during its ripening at constant temperatures were measured using 3 stabilizers.It was found that:1） the concentration of acetic acid should be more than 90％,2） the ripening temperature should be less than 35℃,3） as a stabilizer, Ca-acetate or Zn-acetate of 1/8 equivalent against ZnCl2 might successfuIly be used.