Multistage process for the preparation of poly(tetramethylene-adipamide)

US4719284A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Werner Nielinger · Krefeld, DE
• Hermann Brinkmeyer · Krefeld, DE
• Rudolf Binsack · Krefeld, DE
• Ludwig Bottenbruch · Krefeld, DE
• Heinz-Josef Fullmann · Leverkusen, DE

Key dates

• Filing date: Jul 16, 1986
• Grant date: Jan 12, 1988
• Expiry date: Jul 16, 2006

Classification

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

Abstract

Process for the preparation of polyamides from 1,4-diaminobutane and adipic acid, wherein a 40 to 70% strength aqueous solution of the monomers is heated at 280.degree.-320.degree. C., preferably 290.degree.-310.degree. C., for a period of 5 to 30 minutes under a pressure of less than 8 bar, to give a precondensate having a relative viscosity of 1.05 to 2.0, and solid phase after-condensation at 180.degree.-260.degree. C.