Porous, powdery polypropylene

US4454198A · kind A · utility

Assignee

• Akzo N.V. · NL

Inventors

• Walter Fickel · Zell am Harmersbach, DE
• Gerhard Ries · Obernburg, DE

Key dates

• Filing date: Feb 7, 1983
• Grant date: Jun 12, 1984
• Expiry date: Feb 7, 2003

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/2982
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Porous, powdery polypropylene is disclosed, obtained by providing a hot solution of polypropylene in pentaerythrol ester as solvent, slowly cooling said solution down to approximately room temperature to provide a solidified mass with or without affecting mechanical size reduction of said solidified mass, and extracting said solidified mass with an extractant in which pentaerythrol is soluble, with or without subsequently removing said solvent to a high degree.