Polypropylene wax and process for the production thereof

US5081322A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Andreas Winter · Königstein, DE
• Volker Dolle · Kelkheim, DE
• Jurgen Rohrmann · Kelkheim, DE
• Martin Antberg · Frankfurt am Main, DE
• Ludwig Bohm · Mainz, DE
• Walter Spaleck · Bocholt, DE

Key dates

• Filing date: Feb 13, 1990
• Grant date: Jan 14, 1992
• Expiry date: Feb 13, 2010

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S585/946
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Polyolefin waxes are obtained in high yield by copolymerizing propylene with small amounts of other olefins in the presence of a catalyst composed of a metallocene of the formula I: ##STR1## and an alumoxane. The waxes are produced as compact, spherical particles having a narrow particle size distribution and high apparent density. In addition, the physical data of these waxes such as, for example, hardness, melting point, melt viscosity etc., are variable within wide limits. The polymer chains are noteworthy for a homogeneous and uniform structure, the comonomer units being predominantly arranged individually between polypropylene blocks.