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Material for cement, and cement

Foreign code F130007251
Posted date Apr 2, 2013
Country United States of America
Application number 06322007
Gazette No. 20100132593
Gazette No. 8172939
Date of filing Sep 18, 2007
Gazette Date Jun 3, 2010
Gazette Date May 8, 2012
International application number JP2007068031
International publication number WO2008090648
Date of international filing Sep 18, 2007
Date of international publication Jul 31, 2008
Priority data
  • P2007-014536 (Jan 25, 2007) JP
  • 2007WO-JP68031 (Sep 18, 2007) WO
Title Material for cement, and cement
Abstract (US8172939)
A material for cement which comprises a calcium salt powder with an inositol phosphate and/or a salt thereof as adsorbed on the surface thereof, the powder having a specific surface area of 60-120 m2/g.
A method of producing a material for cement comprises the step of mixing a calcium ion-containing solution adjusted to alkalinity with a phosphate ion-containing solution to produce a precipitate, the step of maturing the precipitate-containing system while maintaining the alkalinity to obtain a calcium salt powder, the step of recovering the calcium salt powder and drying the same, and the step of immersing the dried calcium salt powder in a solution containing an inositol phosphate and/or a salt thereof to cause the inositol phosphate and/or salt thereof to be adsorbed on the surface of the calcium salt powder.
Scope of claims [claim1]
1. A material for cement, characterized in that: it comprises a calcium salt powder with an inositol phosphate and/or a salt thereof as adsorbed on the surface thereof; and
the powder has a specific surface area of 60-120 m2/g after adsorption,
wherein the calcium salt is hydroxyapatite,
wherein the inositol phosphate is phytic acid (inositol hexaphosphate).
[claim2]
2. The material for cement according to claim 1, wherein the hydroxyapatite powder shows a (002) plane half width of 0.30-0.45 deg. as determined by X ray diffractometry.
[claim3]
3. The material for cement according to claim 1, wherein the powder has a median diameter within the range of 5-20 mu m and the content of particles having a diameter of 3-50 mu m is not lower than 60% by volume of the whole powder.
[claim4]
4. A method of producing the material for cement according to claim 1, characterized in that it comprises: the step of mixing a calcium ion-containing solution adjusted to alkalinity with a phosphate ion-containing solution to produce a precipitate;
the step of maturing the precipitate-containing system while maintaining the alkalinity to obtain a hydroxyapatite powder;
the step of recovering the hydroxyapatite powder and drying the same; and
the step of immersing the dried hydroxyapatite powder in a solution containing phytic acid and/or a salt thereof to cause the phytic acid and/or salt thereof to be adsorbed on the surface of the hydroxyapatite powder.
[claim5]
5. The method of producing the material for cement according to claim 4, wherein the precipitate-containing system is maintained at a temperature of 20-70 deg. C. to obtain the hydroxyapatite powder.
[claim6]
6. The method of producing the material for cement according to claim 4, wherein the step of recovering and drying the hydroxyapatite powder is carried out in the manner of freeze drying or drying by heating at 50-150 deg. C.
[claim7]
7. The method of producing the material for cement according to claim 4 which further comprises the step of pulverizing the dried hydroxyapatite powder.
[claim8]
8. The method of producing the material for cement according to claim 7, wherein the step of pulverizing is carried out in the manner of wet pulverization using a vessel-driven medium mill.
[claim9]
9. The method of producing the material for cement according to claim 1, characterized in that it comprises: the step of mixing a calcium ion-containing solution adjusted to alkalinity, a phosphate ion-containing solution and a solution containing phytic acid and/or a salt thereof together to produce a precipitate; and
the step of maturing the precipitate-containing system while maintaining the alkalinity to obtain a phytic acid-carrying hydroxyapatite powder,
wherein the powder has a specific surface area of 60-120 m2/g after adsorption.
[claim10]
10. A cement characterized in that it is produced by kneading the material for cement according to claim 1 with an aqueous solvent, followed by hardening.
[claim11]
11. The cement according to claim 10 which has a compression strength, after hardening, of not lower than 14 MPa.
[claim12]
12. The cement according to claim 10, wherein the kneading of the material for cement with the aqueous solvent is carried out with a mixture ratio by weight (solid to liquid ratio) between 1/0.31 and 1/0.45.
  • Inventor, and Inventor/Applicant
  • AIZAWA MAMORU
  • HORIGUCHI YUKIKO
  • MEIJI UNIVERSITY
IPC(International Patent Classification)
U.S. Cl./(Sub)
  • A61L027/12
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