PRODUCTION OF AROMATIC POLYAMIDE

A process for producing an aromatic polyamide which comprises: (a) a dicarboxylic acid component which consists of 30100 mol% of terephthalic acid and optionally 0-70 mol% of at least one dicarboxylic acid other than terephthalic acid, and (b) a diamine component which consists of 50-100 mol% of an...

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Bibliographische Detailangaben
Hauptverfasser:	WAKATSURU, KENJI, OMORI, SATOSHI, MURAKAMI, HIDETATSU
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	CHEMISTRY COMPOSITIONS BASED THEREON MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-UP
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Beschreibung
Zusammenfassung:	A process for producing an aromatic polyamide which comprises: (a) a dicarboxylic acid component which consists of 30100 mol% of terephthalic acid and optionally 0-70 mol% of at least one dicarboxylic acid other than terephthalic acid, and (b) a diamine component which consists of 50-100 mol% of an aliphatic alkylenediamine of 4-25 carbons and optionally 0-50 mol% of at least one alicyclic diamine of 3-25 carbons, said process comprising a first step of performing melt reaction of said dicarboxylic acid with said diamine, thereby giving a low molecular weight condensate having an intrinsic viscosity ¢?! of 0.05-0.6 dl/g, a second step of subjecting it to solid phase polymerization, thereby giving an aromatic polyamide precursor having an intrinsic viscosity ¢?! of 0.5-1.0 dl/g, and a third step of subjecting it to melt polymerization, thereby giving an aromatic polyamide having a desired intrinsic viscosity ¢?! of 0.8-2.5 dl/g. This process permits the industrial production of high molecular weight aromatic polyamides in an economical and efficient manner.