Compositions: ceramic – Ceramic compositions – Refractory
Patent
1988-06-10
1990-06-05
Bell, Mark L.
Compositions: ceramic
Ceramic compositions
Refractory
501 12, 501 34, 501104, 501105, 501106, 501107, 423 70, 423 81, 423608, C04B 3548
Patent
active
049314149
ABSTRACT:
Solid, transparent, non-vitreous, microspheres (zirconia-silica) are formed by extractive gelation (extracting carboxylic acid away from zirconyl carboxylate) of a sol in liquid medium such as hot peanut oil. Zirconyl carboxylate precursor sol is prepared and added in droplet form to the liquid extractant (peanut oil) at an elevated temperature at which a carboxylic acid is liberated from the zirconyl carboxylate. The droplets remain in the extractant for sufficient time to form stable gel spheroids which are separated from the extractant and fired to convert them to durable spheroids useful as lens elements in retroreflective sheeting.
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Lange Roger W.
Wood Thomas E.
Bell Mark L.
Green Anthony J.
Kirn Walter N.
Little Douglas B.
Minnesota Mining and Manufacturing Company
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