Process for the preparation of thermally stable polyoxymethylene copolymers

USRE39182E1 · kind E1 · reissue

Assignee

• Ticona LLC · US

Inventors

• Karl-Friedrich Muck · Wiesbaden, DE
• Horst Roschert · Ober-Hilbersheim, DE
• Robert M. Gronner · Erlanger, US
• Satyajit Verma · Port Aransas, US
• Michael G. Yearwood · Corpus Christi, US

Key dates

• Filing date: Nov 30, 2001
• Grant date: Jul 11, 2006
• Expiry date: Nov 30, 2021

Classification

• Technology area (CPC —): General

Abstract

A process for the preparation of polyoxymethylene copolymers, wherein 1,3,5-trioxane is polymerized with generally known comonomers in the presence of a strong protonic acid initiator and in the presence of a formaldehyde dialkyl acetal, and wherein the initiator is dissolved in the formaldehyde dialkyl acetal before admixing to the trioxane and the comonomers.