The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 12, 2012
Filed:
Dec. 20, 2005
Kai Schumacher, Hofheim, DE;
Martin Moerters, Rheinfelden, DE;
Juergen Flesch, Rayong, TH;
Marcus Von Twistern, Mobile, AL (US);
Volker Hamm, Bad Saeckingen, DE;
Matthias Schmitt, Buggingen, DE;
Harald Alff, Kahl, DE;
Roland Schilling, Freigericht, DE;
Kai Schumacher, Hofheim, DE;
Martin Moerters, Rheinfelden, DE;
Juergen Flesch, Rayong, TH;
Marcus Von Twistern, Mobile, AL (US);
Volker Hamm, Bad Saeckingen, DE;
Matthias Schmitt, Buggingen, DE;
Harald Alff, Kahl, DE;
Roland Schilling, Freigericht, DE;
Evonik Degussa GmbH, Essen, DE;
Abstract
Aluminum oxide powder in the form of aggregates of primary-particles, which has a BET surface area of from 10 to 90 m2/g and comprises as crystalline phases, in addition to gamma-aluminum oxide and/or theta-aluminum oxide, at least 30% of delta-aluminum oxide. It is prepared by vaporizing aluminum chloride and burning the vapor together with hydrogen and air, the ratio of primary air/secondary air being 0.01 to 2, the exit speed vof the reaction mixture from the burner being at least 10 m/s, the lambda value being 1 to 4, the gamma value being 1 to 3 and the value of gamma*v/lambda being greater than or equal to 55. Dispersion comprising the aluminum oxide powder. Coating composition comprising the dispersion.