Patent ES-8603543-A1 (ES)
Title: Polyparaphenylene-terephthalamide blends, their preparation and process to obtain fibres therewith.
IPC: D01F6/60
Filed: 1981-12-21
Abstract: EP--55190 A A fluid, homogeneous and mouldable compsn. comprises N-methylpyrrolidone-2, pure polyparaphenylene terephthalamide (I) in amt. of 5-7 wt.% based on compsn. CaCl2 or LiCl and a tert. amine of pKH2O at most 6.60, the ratio of the no. of moles of the chloride amine to the no. of paraphenylene units being 0.75-2 for the chloride and 1-3 for the amine. - The compsn. is obtd. by reacting terephthaloyl chloride in stoichiometric amt. with a paraphenylenediamine soln., in amt. such that a compsn. of least 5 wt.% (I) can be formed in a homogeneous mixt. of N-methylpyrrolidone, CaCl2 or LiCl and tert. amine of pK H2O at most 6.60, in the molar ratio indicated above without however exceeding the solubility limit of CaCl2 or LiCl, and opt. adding a fresh amt. of the tert. amine and/or N-methylpyrrolidone opt. contg. CaCl2 or LiCl so that the final compsn. contains 5-7 wt.% (I) and also 0.75-2 moles CaCl2 or LiCl and pref. 2-3 moles tert. amine per paraphenyleneterephthalate unit. - The compsn. is used for the prodn. of yarns, fibres, films or fibrids by extrusion or casting at pref. less than 25 deg.C below room temp. e.g. 9-10 deg.C. The compsn. enables (I) to be more easily processed and shaped than in known processes not only by eliminating intermediate processing steps (e.g. separation and dissolution of (I)) but also by the use of solvents which are easier to handle and less dangerous than H2SO4 or hexamethyl phosphotiamide. EPAB- EP--55190 B A fluid, homogeneous and mouldable compsn. comprises N-methylpyrrolidone-2, pure polyparaphenylene terephthalamide (I) in amt. of 5-7 wt.% based on compsn. CaCl2 or LiCl and a tert. amine of pKH2O at most 6.60, the ratio of the no. of moles of the chloride amine to the no. of paraphenylene units being 0.75-2 for the chloride and 1-3 for the amine. - The compsn. is obtd. by reacting terephthaloyl chloride in stoichiometric amt. with a paraphenylenediamine soln., in amt. such that a compsn. of least 5 wt.% (I) can be formed in a homogeneous mixt. of N-methylpyrrolidone, CaCl2 or LiCl and tert. amine of pK H2O at most 6.60, in the molar ratio indicated above without however exceeding the solubility limit of CaCl2 or LiCl, and opt. adding a fresh amt. of the tert. amine and/or N-methylpyrrolidone opt. contg. CaCl2 or LiCl so that the final compsn. contains 5-7 wt.% (I) and also 0.75-2 moles CaCl2 or LiCl and pref. 2-3 moles tert. amine per paraphenyleneterephthalate unit. - The compsn. is used for the prodn. of yarns, fibres, films or fibrids by extrusion or casting at pref. less than 25 deg.C below room temp. e.g. 9-10 deg.C. The compsn. enables (I) to be more easily processed and shaped than in known processes not only by eliminating intermediate processing steps (e.g. separation and dissolution of (I)) but also by the use of solvents which are easier to handle and less dangeous than H2SO4 or hexamethyl phosphotiamide. (13pp) - EP--55190 B A fluid, homogeneous and mouldable compsn. comprises N-methylpyrrolidone-2, pure polyparaphenylene terephthalamide (I) in amt. of 5-7 wt.% based on compsn. CaCl2 or LiCl and a tert. amine of pKH2O at most 6.60, the ratio of the no. of moles of the chloride amine to the no. of paraphenylene units being 0.75-2 for the chloride and 1-3 for the amine. - The compsn. is obtd. by reacting terephthaloyl chloride in stoichiometric amt. with a paraphenylenediamine soln., in amt. such that a compsn. of least 5 wt.% (I) can be formed in a homogeneous mixt. of N-methylpyrrolidone, CaCl2 or LiCl and tert. amine of pK H2O at most 6.60, in the molar ratio indicated above without however exceeding the solubility limit of CaCl2 or LiCl, and opt. adding a fresh amt. of the tert. amine and/or N-methylpyrrolidone opt. contg. CaCl2 or LiCl so that the final compsn. contains 5-7 wt.% (I) and also 0.75-2 moles CaCl2 or LiCl and pref. 2-3 moles tert. amine per paraphenyleneterephthalate unit. - The compsn. is used for the prodn. of yarns, fibres, films or fibrids by extrusion or casting at pref. less than 25 deg.C below room temp. e.g. 9-10 deg.C. The compsn. enables (I) to be more easily processed and shaped than in known processes not only by eliminating intermediate processing steps (e.g. separation and dissolution of (I)) but also by the use of solvents which are easier to handle and less dangerous than H2SO4 or hexamethyl phosphotiamide. USAB- US4579895 A Prodn. of a homogeneous, anisotropic, fluid compsn. comprises reacting a substantially stoichiometric amt. of terephthaloyl chloride with a soln. of para-phenylenediamine in an amt. to form a polymer compsn. contg. 5wt.% or more of para-phenylene -terephthalamide, in a homogeneous mixt. of N-methyl-pyrrolidone and CaCl2 or LiCl, and a tert. amine of pK H2O of 6.60 or lower. The molar ratio of CaCl2 or LiCl to the para-phenylenediamine is 0.75-2 and 1-3 in the case of tert. amine. - A further amt. of the same tert. amine and/or of N-methyl-pyrrolidone-2, opt. contg. CaCl2 or LiCl, is added, so that the final compsn. contains 5-7wt.% of poly-para-phenylene -terephthalamide, and 0.75-2 mols CaCl2 or LiCl, and 2-3 mols of tert.amine per para-phenylene -terephthalamide unit. - Pref. tert.amine is (iso)quinoline, methylpyridine or di(m)ethylaniline. Reaction can be carried out continuously or batchwise.