Poly-para-phenyleneterephthalamide compositions, their preparation and a process for the production of fibres from these compounds

Claim 1

A process for the production of a homogeneous, anisotropic, fluid composition that as produced can be directly shaped, in which process a substantially stoichiometric amount of substantially pure terephthaloyl chloride is reacted with a solution of substantially pure para-phenylenediamine in an amount such as to form a polymer composition containing at least 5% by weight of para-phenyleneterephthalamide, in a homogeneous mixture of N-methyl-pyrrolidone and calcium chloride or lithium chloride, and a tertiary amine with a pK H 2 O equal to at most 6.60, the molar ratio of calcium chloride or lithium chloride to the para-phenylenediamine being 0.75 to 2 in the case of the calcium chloride or lithium chloride and 1 to 3 in the case of the tertiary amine, without however exceeding the solubility limit of the calcium chloride or lithium chloride, and a further amount of the same tertiary amine and/or of N-methylpyrrolidone-2, which may contain calcium chloride or lithium chloride, is added, so that the final shapable composition contains 5 to 7% by weight of poly-para-phenyleneterephthalamide and at the same time 0.75 to 2 mols of calcium chloride or lithium chloride and 2 to 3 mols of tertiary amine per para-phenyleneterephthalamide unit.