Method for producing polyamides from dinitriles and diamines

US6699960B1 · kind B1 · utility

Assignee

• BASF SE

Inventors

• Frank Ohlbach · Mülheim an der Ruhr, DE
• Hermann Luyken · Ludwigshafen, DE

Key dates

• Filing date: Jan 29, 2002
• Grant date: Mar 2, 2004
• Expiry date: Feb 23, 2022

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G69/38
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A polyamide is prepared by reacting at least one dinitrile and at least one diamine with water at a temperature from 90 to 400° C. and a pressure from 0.1 to 50*106 Pa in a molar ratio of at least 1:1 for water to the sum total of dinitrile and diamine in the presence of a heterogeneous catalyst selected from the group consisting of aluminum oxide, tin oxide, silicon oxide, oxides of the second to sixth transition group of the periodic table, oxides of the lanthanides and actinides, sheet-silicates and zeolites.