Stock material or miscellaneous articles – Coated or structually defined flake – particle – cell – strand,... – Particulate matter
Reexamination Certificate
2011-04-19
2011-04-19
Le, H. (Holly) T (Department: 1788)
Stock material or miscellaneous articles
Coated or structually defined flake, particle, cell, strand,...
Particulate matter
C423S608000
Reexamination Certificate
active
07927699
ABSTRACT:
The present invention provides a porous zirconium powder having improved heat resistance of total pore volume, and a simple production method thereof. More specifically, the present invention provides:(1) a porous zirconium powder in which total pore volume following heat treatment for three hours at 1000° C. is at least 0.75 ml/g, and total volume of pores having a diameter of 10 to 100 nm following heat treatment for three hours at 1000° C. is at least 30% of the total pore volume, and(2) a production method of a porous zirconia powder comprising: forming a basic zirconium sulfate by adding a sulfating agent to a zirconium salt solution; forming zirconium hydroxide by neutralizing the basic zirconium sulfate; and heat-treating the zirconium hydroxide, wherein, when adding the sulfating agent to the zirconium salt solution, the sulfating agent is added to the zirconium salt solution having a temperature of 100° C. or higher in an autoclave.
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European Search Report dated Dec. 19, 2007 issued in corresponding European Application No. 07114715.1.
Daiichi Kigenso Kagaku Kogyo Co., Ltd.
Le H. (Holly) T
Westerman Hattori Daniels & Adrian LLP
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