Process for the preparation of polyacetal copolymers

US5962623A · kind A · utility

Assignee

• Ticona LLC · US

Inventors

• Peter Eckardt · Hofheim, DE
• Michael Hoffmockel · Niedernhausen, DE
• Karl-Friedrich Muck · Wiesbaden, DE
• Gerhard Reuschel · Leingarten, DE
• Satyajit Verma · Port Aransas, US
• Michael G. Yearwood · Corpus Christi, US

Key dates

• Filing date: Sep 8, 1998
• Grant date: Oct 5, 1999
• Expiry date: Sep 8, 2018

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G2/06
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A continuous process for the preparation of polyacetal copolymers from 1,3,5-trioxane and the comonomers known for this purpose using strong protic acids as an initiator, in which the initiator is added in an amount of 0.01 to 0.6 ppm, based on the total amount of monomers, in finely divided form to the monomer mixture, after the polymerization step the crude polymer is transferred from the polymerization reactor to a mixing unit without further intermediate steps, excess monomer is removed from the crude polymer in the mixing unit or between polymerization reactor and mixing unit by applying reduced pressure and, if desired, generally customary stabilizers, assistants, fillers, reinforcing materials and/or colorants are incorporated into the polymer in the mixing unit.