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Ceramic particle group and method for production thereof and use thereof achieved

Foreign code F110005390
File No. K02014WO
Posted date Sep 5, 2011
Country United States of America
Application number 66262905
Gazette No. 20070259181
Gazette No. 7749429
Date of filing Sep 13, 2005
Gazette Date Nov 8, 2007
Gazette Date Jul 6, 2010
International application number JP2005016837
International publication number WO2006030782
Date of international filing Sep 13, 2005
Date of international publication Mar 23, 2006
Priority data
  • P2004-267404 (Sep 14, 2004) JP
  • P2005-041348 (Feb 17, 2005) JP
  • 2005WO-JP16837 (Sep 13, 2005) WO
Title Ceramic particle group and method for production thereof and use thereof achieved
Abstract (US7749429)
A ceramic particle group dispersed in a solvent in a state of primary particles of single crystal, a method for production thereof and a use thereof are disclosed.
In one embodiment a method is disclosed for producing a sintered particle (ceramic particle) group of hydroxyapatite (HAp), which includes a step of subjecting a system wherein calcium carbonate is present between primary particles of hydroxyapatite (HAp) to sintering and then dissolving calcium carbonate with water to remove calcium carbonate.
A hydroxyapatite (HAp) sintered particle group produced by the above method is a nanometer size particle group having a particle diameter of about 70 to about 120 nm, and is a particle group having a uniform particle diameter (coefficient of variation: 12%), and further 96% of the particle group is dispersed as a single crystal particle.
Scope of claims [claim1]
1. A method for producing a ceramic particle group, comprising: mixing ceramic particles of ceramic material with an anti-fusing agent, so as to place the anti-fusing agent between the primary particles of ceramic material to be subjected to sintering;
sintering the mixed particles; and
removing the anti-fusing agent after sintering the mixed particles.
[claim2]
2. A method as set forth in claim 1, wherein mixing the ceramic particles further comprises: mixing the primary particles with a solution that contains a high-molecular compound having any of a carboxyl group, a sulfuric acid group, a sulfonic acid group, a phosphoric acid group, a phosphonic acid group, and an amino group on side chains; and,
adding metal salts to the mixture of the primary particles and the high-molecular compound.
[claim3]
3. A method as set forth in claim 2, wherein the high-molecular compound is at least one kind of substance selected from the group consisting of: poly(acrylic acid), poly(methacrylic acid), poly(glutamic acid), poly(ethylene sulfonic acid), poly(sulfoalkyl methacrylate), poly(acrylamido-N-methylphosphonic acid), and polypeptide.
[claim4]
4. A method as set forth in claim 1, wherein the anti-fusing agent is non-volatile at a sintering temperature during sintering of the mixed particles.
[claim5]
5. A method as set forth in claim 1, wherein removing the anti-fusing agent includes dissolving the anti-fusing agent in a solvent.
[claim6]
6. A method as set forth in claim 5, wherein the solvent used in removing the anti-fusing agent dissolves the anti-fusing agent but does not dissolve the ceramic particles.
[claim7]
7. A method as set forth in claim 5, wherein the anti-fusing agent is soluble in an aqueous solvent.
[claim8]
8. A method as set forth in claim 5, wherein the anti-fusing agent is calcium carbonate.
[claim9]
9. A method as set forth in claim 1, further comprising: generating primary particles before mixing the ceramic particles.
[claim10]
10. A method as set forth in claim 9, wherein the primary particles generated have a particle diameter in a range of 10 nm to 500 nm.
[claim11]
11. A method as set forth in claim 9, wherein a coefficient of variation of particle diameter of a primary particle group comprised of the primary particles generated is no greater than 20%.
  • Inventor, and Inventor/Applicant
  • FURUZONO TSUTOMU
  • OKADA MASAHIRO
  • JAPAN SCIENCE AND TECHNOLOGY AGENCY
IPC(International Patent Classification)
Reference ( R and D project ) PRESTO Nanostructure and Material Property AREA
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