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US 4,045,417 AGranted
Production of aromatic polyamides
AssigneeSumitomo Chemical Company, Limited
InventorsNoboru Yamazaki, Fukuji Higashi
Life of this patent
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Abstract
Aromatic polyamides having high polymerization degree are produced by polycondensing an arylene-containing aminocarboxylic acid, or a dicarboxylic acid with an aromatic diamine in the presence of a phosphorus compound, a tertiary amine and a metal halide using N-methylpyrrolidone and/or dimethylacetamide as a solvent.
Claims8
In a process for producing a fiber forming aromatic polyamide by polycondensing an arylene containing aminocarboxylic acid of the formula,
- H.sub.2 N -- R.sup.1 --COOH
- wherein R.sup.1 is an aromatic hydrocarbon radical or two or more aromatic hydrocarbon radicals bonded through an alkylene group having 1 to 4 carbon atoms, an alkylidene group having 2 to 4 carbon atoms, --O--, --S--, --SO.sub.2 --, --CO--, --NH--, --NR'-- wherein R' is an alkyl group having 1 to 4 carbon atoms, --CONH--, ##STR9## or said radical or radicals having one or more substituents on the aromatic nuclei, said substituent being an alkyl group having 1 to 6 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, a phenyl group, a halogen atom, a nitro group or a cyano group,
- in the presence of a phosphorus compound of the formula,
- R.sup.4 -- P (OR.sup.5).sub.2
- wherein R.sup.4 is OR.sup.5, a hydroxyl group, an alkyl group having 1 to 6 carbon atoms or an aryl group with or without at least one substituent selected from the group consisting of an alkyl group having 1 to 6 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, a phenyl group, a halogen atom, a nitro group and a cyano group;
- and R.sup.5 is an aryl group with or without at least one substituent selected from the group consisting of an alkyl group having 1 to 6 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, a phenyl group, a nitro group and a cyano group,
- and a tertiary amine in the liquid phase, wherein the tertiary amine is used in an amount of 1 mole or more per mole of the phosphorus compound and the phosphorus compound is used in an amount of 1 mole or more per mole of the arylene containing aminocarboxylic acid,
- the improvement which comprises carrying out the polycondensation using a solvent selected from the group consisting of N-methylpyrrolidone and dimethylacetamide as the reaction medium and a metal halide selected from the group consisting of a lithium halide and a calcium halide, wherein the metal halide is used in an amount of 1-15 percent by weight based on the weight of the mixture of the tertiary amine and the solvent.
5 more elements
Dependencies are inferred from the claim text.