PROCESS FOR PREPARING OLEFIN POLYMER BY SLURRY LOOP POLYMERIZATION HAVING HIGH POWDER DENSITY

摘要

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.

主权项

1. 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 and a total d10 value of lower than 20 μm.