Catalytic, solid state process for the preparation of linear polyamides

US5128442A · kind A · utility

Assignee

• BASF SE

Inventors

• Gunter Pipper · Bad Dürkheim, DE
• Wolfgang Mueller · Wappingers Falls, US
• Harald Dauns · Bad Dürkheim, DE

Key dates

• Filing date: Apr 8, 1991
• Grant date: Jul 7, 1992
• Expiry date: Apr 8, 2011

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G69/28
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A process for the preparation of a linear polyamide by reacting the appropriate dicarboxylic acid and diamine in a liquid reaction medium with the addition of a catalytically effective phosphorus compound, removing the reaction medium to give a solid salt, precondensing the latter in the solid phase at a temperature of from 140.degree. C. to 5.degree. C. below the melting point of the salt and continuing condensation at a temperature above that used for the precondensation until the desired degree of condensation is reached.