Wholly aromatic polyamide from alkylsulfonyl aromatic diamine

US5128440A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Gunter Keil
• Reiner Hess · Gersthofen, DE
• Jochen Rapp · Frankfurt, DE

Key dates

• Filing date: Feb 13, 1991
• Grant date: Jul 7, 1992
• Expiry date: Feb 13, 2011

Classification

• Technology area (CPC D): Textiles; Paper
• CPC primary: D01F6/805
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Aromatic copolyamides are described, which are soluble in organic amide solvents. The polymers are composed to at least 95 mol % of repeat structural units PA1 A: --OC--AR--CO-- PA1 B: --HN--Ar'--NH-- PA1 C: --HN--Ar"--NH-- ##STR1## in the combinations A+B+C+D, or A+C+D+E and up to 5 mol % of m-bond-containing structural units F and/or G derived from aromatic dicarboxylic acids (F') and/or from aromatic diamines (G'), the sum total of the mole fractions of structural units A+F and the sum total of the mole fractions of the structural units of B+C+D+E+G being essentially the same, --Ar-- and --Ar'-- are divalent aromatic radicals whose C--N valence bonds are in a para-position or in a similar coaxial or parallel position and which may be substituted by one or two inert radicals, such as lower alkykl or halogen, ##STR2## is a trivalent aromatic radical which after removal of the --SO.sub.2 R group has the same meaning as --Ar-- or --Ar'-- or else is the structural unit ##STR3## wehre X is --O--, --NHCO--, --SO.sub.2 -- or --CO--, --R is lower alkyl and PA1 --R' is lower alkyl or alkoxy, and the proportions of the diamine components B, C, D and E are within the following limits: PA1 B…