Evonik Degussa GmbH has obtained a patent for an aluminium oxide powder in the form of aggregates of primary par-ticles,wherein each particle has a BET surface area of from 10 to 90 m2/g and is comprised of as crystalline phases,in ad-dition to gamma-aluminium oxide and/or theta-aluminium oxide,at least 30%by weight of delta-aluminium oxide,and wherein the aluminium oxide powder has a tamped density of 10 to 200 g/l.
Source:
http://www.coatingsworld.com/issues/2012-12/view_patents/evonik-patents-aluminum-oxide-powder-dispersion-and-coating/
