Process for the production of polypropylene powders

US4510305A · kind A · utility

Assignee

• Coathylene S.A. · CH

Inventors

• Hans H. Korsgen · Villars-sur-Glâne, CH
• Wolfgang Weller · Winnenden, DE

Key dates

• Filing date: Dec 22, 1983
• Grant date: Apr 9, 1985
• Expiry date: Dec 22, 2003

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02W30/62
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

Polypropylene powder is produced by dissolving polypropylene in a solvent mixture at an elevated temperature, cooling the solution to below about 80.degree. while maintaining it in quiescent condition for precipitation of the polypropylene as particles which are composed of polypropylene grains, separating the precipitate, drying, and subjecting the dry particles to mechanical comminution.