Process for preparing olefin polymer by slurry loop polymerization having high powder density

US9464147B2 · kind B2 · utility

Assignee

• Basell Polyolefine GmbH · DE

Inventors

• Lars Kölling · Mannheim, DE
• Shahram Mihan · Bad Soden, DE

Key dates

• Filing date: Dec 4, 2012
• Grant date: Oct 11, 2016
• Expiry date: Jul 10, 2033

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F10/02
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The instant invention pertains to a process for preparing an ethylene homo- or copolymer in the presence of a supported chromium catalyst by slurry loop polymerization or copolymerization, whereby the resulting polymer powder has an increased powder density, in which the supported chromium catalyst has a chromium content of from 0.01 to 5 wt.-%, based on the element in the finished catalyst, and shows a particle size distribution measured according to ISO 13320-2009 comprising two main fractions one of which having a d50 of from 15 to 40 μm and the other having a d50 of from 45 to 80 μm said catalyst being further characterized by the fact that less than 10% wt of its catalyst particles has diameter lower than 20 μm.