Polytrimethylene terephthalate resins with improved properties

US7029748B2 · kind B2 · utility

Assignee

• Zimmer A.G. · DE

Inventors

• Eckhard Seidel · Frankfurt, DE
• Bernd Gemmel · Gelnhausen, DE
• Karl-Heinz Heldmann · Raunheim, DE

Key dates

• Filing date: Feb 20, 2003
• Grant date: Apr 18, 2006
• Expiry date: Feb 20, 2023

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/2924
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A composition comprising Polytrimethylene terephthalate (PTT) with a reduced emission of acrolein is obtained by contacting Polytrimethylene terephthalate (PTT) resin with an effective amount of a melt unstable, organic nitrogen-containing stabilizing compound. Such PTT resin has an acrolein formation rate at 280° C. of less than 15 ppm/minute. Preferably the residual acrolein content of the PTT resin is less than 5 ppm. Preferred additive compounds include amines, amino acids, amidines, urea and other N-compounds. The additive compounds are added to the polymer in molten state and/or to the resin, which is then processed to fibers, filaments, non-wovens, films and/or moldings.