Method for producing polyoxymethylenes

US7863393B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Jens Assmann · Haan, DE
• Knut Zollner · Mannheim, DE
• Johannes Heinemann · Vilvoorde, BE
• Elmar Stockelmann · Bad Kötzting, DE
• Achim Stammer · Freinsheim, DE

Key dates

• Filing date: Nov 28, 2005
• Grant date: Jan 4, 2011
• Expiry date: Feb 18, 2027

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G2/30
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Process for preparation of polyoxymethylenes via polymerization of the monomers a) in the presence of cationic initiators b), and also, if appropriate, in the presence of regulators c), and subsequent deactivation and isolation of the polymer, which comprises undertaking the polymerization in a tubular reactor with static mixing elements and with a mixing zone, a polymerization zone, and a deactivation zone, the diameter of the tubular reactor in the mixing zone being <90% of the diameter in the polymerization zone.