| US 7,510,607 B2 | ||
| Coating composition and method for producing the same | ||
| Kazuhisa Kajihara, Ehime (Japan); and Yoshiaki Takeuchi, Ehime (Japan) | ||
| Assigned to Sumitomo Chemical Company, Limited, Osaka (Japan) | ||
| Filed on Jul. 16, 2004, as Appl. No. 10/892,599. | ||
| Claims priority of application No. 2003-200310 (JP), filed on Jul. 23, 2003. | ||
| Prior Publication US 2005/0019557 A1, Jan. 27, 2005 | ||
| Int. Cl. C01F 7/02 (2006.01); C01F 7/30 (2006.01); C08K 3/22 (2006.01); C09D 201/00 (2006.01); C09D 5/23 (2006.01) | ||
| U.S. Cl. 106—287.17 [106/499; 501/127; 501/153; 524/437] | 9 Claims |
| 1. A coating composition comprising a binder, a solvent, and an α-alumina powder, wherein the α-alumina powder satisfies the
following (a) and (b):
(a) when the α-alumina powder is pressed to obtain a green body and the green body is sintered at 1250° C. under atmospheric
pressure, the sintered body has a relative density of about 80% or more, and
(b) a BET specific surface area of the α-alumina powder is about 10 m2/g;
and wherein the α-alumina powder is obtained by calcining an α-alumina precursor in an atmosphere of a partial pressure of
water vapor of about 600 Pa or less, and wherein silicon, iron, titanium, sodium and calcium are each contained in the α-alumina
precursor in an amount of about 50 ppm or less.
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