Patent US2304880A successfully refreshed from Google Patents.
EP0104640A2
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Sintered apatite bodies and composites thereof
Assignee: Inax Corp
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Filing: 1983-09-26
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Granted: —
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Expires: 2003-09-26
Abstract
Abstract There are provided a novel sintered apatite body and a novel sintered apatite-mineral fiber material composite. The crystals of the sintered apatite have fine dense crystalline structures comprising needle-like fine crystals and are entangled together, whereby the mechanical properties of the sintered apatite body or composite are markedly enhanced. The sintered body and composite wherein the apatite is hydroxyapatite are useful for bioceramic uses. The sintered apatite body or composite is produced by baking under pressure an apatite material alone or in contact with a reinforcing mineral fiber material in the presence of water at a temperature lower than 1000°C, and further at a temperature lower than the temperature causing deterioration of the fiber material in the case of the composite.
Inventors
- 👤 Seiichi Hatahira
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 10:22
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/447; C04B35/71; C04B35/78; C04B35/80; A; A61; A61F; A61F2/00; A61F2/02; A61F2/28; A61L; A61L27/00; A61L27/02; A61L27/12; A61L27/40; A61L27/42; A61L27/425; C04B35/622; C04B35/64; C08; C08K; C08K7/00; C08K7/02; C08K7/04; A61F2310/00; A61F2310/00005; A61F2310/00179; A61F2310/00293; Y; Y10; Y10S; Y10S428/00; Y10S428/902
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
55 words
A process for sintering apatite by baking an apatite material selected from hydroxyapatite, carbonate apatite, fluoroapatite, chloroapatite, precursor materials thereof, and mixtures thereof; characterized by baking the apatite material in the presence of water in addition to the crystal water thereof under pressure at a temperature lower than 1000°C to substantially sinter the apatite material.
Claim 2
Dependent Claim
55 words
A process for sintering apatite by baking an apatite material selected from hydroxyapatite, carbonate apatite, fluoroapatite, chloroapatite, precursor materials thereof, and mixtures thereof; characterized by baking the apatite material in the presence of water in addition to the crystal water thereof under pressure at a temperature lower than 1000°C to substantially sinter the apatite material.
Claim 3
Dependent Claim
47 words
A process according to Claim 1, in which a matrix amount of the apatite material is baked in contact with- an effective amount of a reinforcing mineral fiber material at a temperature lower than 1000°C and lower than the temperature causing substantial deterioration of the fiber material.
Claim 4
Dependent Claim
41 words
3 . A process according to Claim 1 or 2, in which the crystals of the sintered apatite have fine dense crystalline structures wherein the crystalls contain at least 30% by weight of needle-like fine crystals and are entangled together. -
Claim 5
Dependent Claim
64 words
A process according to any one of Claims 1 to 3, in which the apatite has the fundamental structure represented by the following formula and the atomic ratio of calcium to phosphorus in the apatite is in the range of 4/3 to 11/6; wherein,Z is selected from OH, C0 3 , F, Cl and mixtures thereof and m is a number satisfying atomic valences.
Claim 6
Dependent Claim
49 words
A process according to any one of Claims 1 to 4, in which a small amount of an inorganic non-phosphorus calcium compound is intimately mixed with an apatite material having a calcium/phosphorus ratio of less than 5/3 to adjust the Ca/P ratio of the apatite material to about 5/3.
Claim 7
Dependent Claim
86 words
A sintered apatite composite comprising a reinforcing material and a sintered apatite matrix wherein the apatite is selected from hydroxyapatite, carbonate apatite, fluoroapatite, chloroapatite and mixtures thereof, consisting essentially of an effective amount of a reinforcing mineral fiber material and a matrix amount of sintered apatite in contact with the fiber material, the crystals of the sintered apatite having fine dense crystalline structures comprising at least about 30% by weight of needle-like fine crystals and are entangled together, and the fiber material is not substantially deteriorated.
Claim 8
Dependent Claim
86 words
A sintered apatite composite comprising a reinforcing material and a sintered apatite matrix wherein the apatite is selected from hydroxyapatite, carbonate apatite, fluoroapatite, chloroapatite and mixtures thereof, consisting essentially of an effective amount of a reinforcing mineral fiber material and a matrix amount of sintered apatite in contact with the fiber material, the crystals of the sintered apatite having fine dense crystalline structures comprising at least about 30% by weight of needle-like fine crystals and are entangled together, and the fiber material is not substantially deteriorated.
Claim 9
Dependent Claim
60 words
A composite according to Claim 6, in which the apatite has the fundamental structure represented by the following formula and the atomic ratio of calcium to phosphorus in the apatite is in the range of 4/3 to 11/6; wherein, Z is selected from OH, C0 3 , F, Cl and mixtures thereof and m is a number satisfying atomic valences.
Claim 10
Dependent Claim
47 words
A composite according to Claim 6 or 7, in which the amount of the fiber material is in the range of about 1% to about 50% by weight and the amount of the apatite material is in the range of about 99% to about 50% by weight.
Claim 11
Dependent Claim
33 words
A composite according to any one of Claims 6 to 8, in which the sintered apatite has open pore voids of 3% to 60% by volume, preferably of 5% to 50% by volume.
Claim 12
Dependent Claim
55 words
A process for sintering apatite by baking an apatite material selected from hydroxyapatite, carbonate apatite, fluoroapatite, chloroapatite, precursor materials thereof, and mixtures thereof; characterized by baking the apatite material in the presence of water in addition to the crystal water thereof under pressure at a temperature lower than 1000°C to substantially sinter the apatite material.
Claim 13
Dependent Claim
55 words
A process for sintering apatite by baking an apatite material selected from hydroxyapatite, carbonate apatite, fluoroapatite, chloroapatite, precursor materials thereof, and mixtures thereof; characterized by baking the apatite material in the presence of water in addition to the crystal water thereof under pressure at a temperature lower than 1000°C to substantially sinter the apatite material.
Claim 14
Dependent Claim
47 words
A process according to Claim 1, in which a matrix amount of the apatite material is baked in contact with- an effective amount of a reinforcing mineral fiber material at a temperature lower than 1000°C and lower than the temperature causing substantial deterioration of the fiber material.
Claim 15
Dependent Claim
39 words
A process according to Claim 1 or 2, in which the crystals of the sintered apatite have fine dense crystalline structures wherein the crystalls contain at least 30% by weight of needle-like fine crystals and are entangled together. -
Claim 16
Dependent Claim
64 words
A process according to any one of Claims 1 to 3, in which the apatite has the fundamental structure represented by the following formula and the atomic ratio of calcium to phosphorus in the apatite is in the range of 4/3 to 11/6; wherein,Z is selected from OH, C0 3 , F, Cl and mixtures thereof and m is a number satisfying atomic valences.
References Cited (Backward Citations)
No citation records indexed.
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