Process and apparatus for removing volatile constituents from polymer melts or pastes

US4578455A · kind A · utility

Assignee

• BASF SE

Inventors

• Gunter Pipper · Bad Dürkheim, DE
• Siegfried Riegger · Ettenheim, DE
• Josef G. Floss · Neustadt, DE

Key dates

• Filing date: Apr 18, 1985
• Grant date: Mar 25, 1986
• Expiry date: Apr 18, 2005

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B29C48/03
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

A process for removing volatile constituents from polymer melts or pastes, wherein the polymer or paste containing the volatile constituents is passed, with continuous formation of fresh surfaces, through one or more zones in which the volatile constituents evaporate, and the volatile constituents are removed from the zone or zones in which they evaporate through, in each case, a plurality of porous orifices, and an apparatus for carrying out said process.