Stock material or miscellaneous articles – Coated or structually defined flake – particle – cell – strand,... – Particulate matter
Patent
1996-07-30
1998-09-01
Chin, Peter
Stock material or miscellaneous articles
Coated or structually defined flake, particle, cell, strand,...
Particulate matter
423625, 423626, 427215, 427242, 427399, B32B 516
Patent
active
058009221
ABSTRACT:
A novel gelation-resistant alumina and process for producing such a product and aqueous slurries composed thereof are disclosed, including grinding aluminum oxide of .alpha.-Al.sub.2 O.sub.3 in the presence of about 0.5 to 3.0 wt. % water. The grinding preferably is performed in a sealed ball mill. Dual phase alumina particles have an aluminum oxide inner core of .alpha.-Al.sub.2 O.sub.3 and an aluminum oxide hydroxide outer phase of .gamma.-AlOOH on the .alpha.-Al.sub.2 O.sub.3, including to a nominal depth, e.g., by way of example, of about 5 to 100 nanometers on the inner core of .alpha.-Al.sub.2 O.sub.3, and having up to 40% higher surface area than the initial aluminum oxide of .alpha.-Al.sub.2 O.sub.3. The novel gelation-resistant alumina can be dispersed in an aqueous slurry having a solids content of 65 wt. % and higher, and the resulting slurry has significantly extended shelf life.
REFERENCES:
patent: H189 (1987-01-01), Bauer
patent: 3954659 (1976-05-01), O'Brien
patent: 4019914 (1977-04-01), Esper et al.
patent: 4055509 (1977-10-01), Weimer
patent: 4117105 (1978-09-01), Hertzenberg et al.
patent: 4211667 (1980-07-01), Yamada et al.
patent: 4242223 (1980-12-01), Christner et al.
patent: 4344928 (1982-08-01), Dupin et al.
patent: 4360449 (1982-11-01), Oberlander et al.
patent: 4657754 (1987-04-01), Bauer et al.
patent: 4676928 (1987-06-01), Leach et al.
patent: 4729890 (1988-03-01), Stacey et al.
patent: 4913840 (1990-04-01), Evans et al.
patent: 5178849 (1993-01-01), Bauer
patent: 5261930 (1993-11-01), Fliedner et al.
patent: 5284809 (1994-02-01), Van Dijen
Anderson Edward M.
Dando Neal R.
Lawhon Carl H.
McRaven Merle D.
Aluminum Company of America
Chin Peter
Glantz Douglas G.
Pearce-Smith David W.
Vincent Sean
LandOfFree
Method of making a gelation-resistant alumina does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method of making a gelation-resistant alumina, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of making a gelation-resistant alumina will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-268207