PROCESS FOR THE BATCHWISE PREPARATION OF POLY-P-PHENYLENE TEREPHTHALAMIDE

摘要

Process for the batchwise preparation of poly-p-phenylene terephthalamide po lymer by means of reacting approximately equimolar amounts of p-phenylene diamine and terephthaloyl dichloride in a solution co ntaining N-methyl-2-pyrrolidone and calcium chloride, wi th the reaction being carried out in a cylindrical reaction vessel equipped wit h a single mixing gear used as stirrer and granulator. t he contents of the reaction vessel being whirlingly mixed as terephthaloyl dichloride is added, the formed polymer being crumbled, and the react ion and the crumbling taking place in one and the same reaction vessel. The whir ling mixing ensures that the terephthaloyl dichloride is very thoroughly mixed into the solution of N-methyl-2-pyrrolidone, calcium chlori de, and p-phenylene diamine before the reaction between the reactants causes a very rapid increase in viscosity. The quality of the prod uct obtained by this process is very high.