3m Innovative Properties Company

Hoechst Aktiengesellschaft

Herbert Strasser

Tilman C Zipplies

Thomas J Blong

Denis Duchesne

Ralph Kaulbach

Gernot Loehr

Albert Killich

Bernd Felix

Hans-Bodo Richter

Ulrich Reiff

The invention relates to high purity fluoropolymers and processes for making such materials. These polymers are particularly suited for applications in the semiconductor industry. The process comprises removal of unstable polymer end groups by fluorination and removal of heavy metal impurities by extraction with an aqueous acid medium.

High purity fluoropolymers

An apparatus suitable in particular for degassing fluoropolymers which have been subjected to thermal degradation contains--in the direction of flow of the product--a product intake, a coolable conveyor section, a comminution apparatus, a heated conveyor section and a product discharge, the entire apparatus being designed to be gastight and advantageously being designed to be resistant to pressure surges and having a gas outlet in the area of the coolable conveyor section and/or in the area of the comminution apparatuses.

Degassing apparatus and use thereof

Growing community of inventors

Burgkirchen, Germany

Herbert Strasser