EP0174827A2
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EP
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Fibrous apatite material and method for producing the same
Assignee: Tonen General Sekiyu KK
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Filing: 1985-09-10
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Granted: —
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Expires: 2005-09-10
Abstract
Abstract A fibrous product of apatite comprises one or more apatites selected from apatites represented by the general formula: wherein m represents Ca, Ba, Mg, Sr, Pb, Cd, Fe and the like, ZO, represents PO 4 , As0 4 , V0 4 , C0 3 and the like, and X represents F, Cℓ, OH and the like. This product has many applications including medical treatment uses and large scale microorganism cultivating media, and is particularly useful for implant materials having a good compatibility with the living organism and superior workability. The apatite product is produced by a method comprising the steps of: (a) preparing a uniform dispersion of fine apatite particles in a solution of binder in water the apatite being one or more apatites selected from the aforesaid apatites; (b) continuously extruding the dispersion through a plurality of spinning orifices in a spinning apparatus, while simultaneously stretching the dispersion into a fibrous state with the aid of a high speed air flow, (c) heating resulting fiber stream to evaporate the water, and (d) blowing the dewatered fiber stream onto a collector means to form a cotton-like product of apatite bonded together by the binder.
Inventors
- 👤 Shigeo Fujii
- 👤 Shoichi Mori
- 👤 Jyoichi Tabuchi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-26 16:56
CPC Classifications
C; C12; C12N; C12N1/00; A; A61; A61F; A61F2/00; A61F2/02; A61F2/28; A61L; A61L27/00; A61L27/02; A61L27/12; D; D01; D01F; D01F9/00; D01F9/08; A61F2310/00; A61F2310/00005; A61F2310/00179; A61F2310/00293; Y; Y10; Y10T; Y10T428/00; Y10T428/249921
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
57 words
A fibrous product of apatite comprising one or more apatites selected from apatites represented by the general formula: wherein M represents Ca, Ba, Mg, Sr, Pb, Cd, Fe and the like, ZO 4 represents PO 4 , AsO 4 , V0 4 , C0 3 and the like, and X represents F, Cℓ, OH and the like.
Claim 2
Dependent Claim
57 words
A fibrous product of apatite comprising one or more apatites selected from apatites represented by the general formula: wherein M represents Ca, Ba, Mg, Sr, Pb, Cd, Fe and the like, ZO 4 represents PO 4 , AsO 4 , V0 4 , C0 3 and the like, and X represents F, Cℓ, OH and the like.
Claim 3
Dependent Claim
38 words
The product according to claim 1, wherein M is at least one alkaline earth metal, ZO 4 is at least one selected from PO 4 , V0 4 and C0 3 , and X is OH and/or F.
Claim 4
Dependent Claim
28 words
The product according to claim 1, wherein substantially all of the apatite is hydroxy-apatite and wherein M is Ca, ZO 4 is PO 4 and X is OH.
Claim 5
Dependent Claim
60 words
The product according to claim 3, wherein the said hydroxy-apatite contains a calcium phosphate type compound, for example 5 to 95 weight % of hydroxy-apatite and 95 to 5 weight % of the calcium phosphate type compound, and preferably the hydroxy-apatite is 20 weight % or more and the said calcium phosphate type compound is 80 weight % or less.
Claim 6
Dependent Claim
28 words
The product according to claim 4, wherein the said hydroxy-apatite is 50 weight % or more and the calcium phosphate type compound is 50 weight % or less.
Claim 7
Dependent Claim
31 words
The product according to claim 4 or claim 5, wherein the said calcium phosphate type compound is at least one compound selected from calcium hydrogen phosphate, tri-calcium phosphate and tetra-calcium phosphate.
Claim 8
Dependent Claim
32 words
The product according to any of claims 1 to 6, which has a mean fiber diameter of 1 pm to 30 µm and a mean fiber length of lmm to 1000 mm.
Claim 9
Dependent Claim
49 words
The product according to any of claims 1 to 7, made in the form of cotton-like product or a non-woven fabric product, and in the latter case preferably the basis weight of the non-woven fabric is in the range of 5 g/m 2 to 200 g/ m 2 .
Claim 10
Independent Claim
183 words
A method of producing a fibrous apatite, for example in cotton-like form, comprising the steps of: (a) preparing a dispersion of apatite by dispersing fine apatite particles uniformly in a solution of binder in water, the binder for example being a water soluble high molecular weight compound such as pullulan, the apatite being one or more apatites selected from apatites represented by the general formula: wherein M represents Ca, Ba, Mg, Sr, Pb, Cd, Fe and the like, Z0 4 represents PO 4 , AsO 4 , VO 4 , C0 3 and the like, and X represents F, Cℓ, OH and the like; (b) continuously extruding the dispersion through a plurality of spinning orifices while simultaneously stretching the dispersion into a fibrous state with the aid of a high speed air flow to form a stream of fine fibers; (c) heating the fiber stream to evaporate the water in the fibers; (d) blowing the so dewatered fiber stream onto a collector means to form a cotton-like product of apatite bonded by the binder; and (e) optionally, if required, calcining the cotton-like product.
Claim 11
Independent Claim
183 words
A method of producing a fibrous apatite, for example in cotton-like form, comprising the steps of: (a) preparing a dispersion of apatite by dispersing fine apatite particles uniformly in a solution of binder in water, the binder for example being a water soluble high molecular weight compound such as pullulan, the apatite being one or more apatites selected from apatites represented by the general formula: wherein M represents Ca, Ba, Mg, Sr, Pb, Cd, Fe and the like, Z0 4 represents PO 4 , AsO 4 , VO 4 , C0 3 and the like, and X represents F, Cℓ, OH and the like; (b) continuously extruding the dispersion through a plurality of spinning orifices while simultaneously stretching the dispersion into a fibrous state with the aid of a high speed air flow to form a stream of fine fibers; (c) heating the fiber stream to evaporate the water in the fibers; (d) blowing the so dewatered fiber stream onto a collector means to form a cotton-like product of apatite bonded by the binder; and (e) optionally, if required, calcining the cotton-like product.
Claim 12
Dependent Claim
24 words
The method according to claim 9 further including the step of making the cotton-like product of apatite into the form of a non-woven fabric.
Claim 13
Dependent Claim
29 words
The method according to claim 9 or claim 10, wherein apatite used is an hydroxy-apatite in which M is Ca, ZO 4 is PO 4 and X is OH.
Claim 14
Dependent Claim
28 words
The method according to claim 9, 10 or 11, wherein said apatite particles are of stick-like form having a mean particle diameter of 50 A to 1 pm.
Claim 15
Independent Claim
24 words
The method according to any of claims 9 to 12, wherein the apatite dispersion further contains fine particles of a calcium phosphate type compound.
Claim 16
Independent Claim
28 words
The method according to any of claims 9 to 13, wherein said fiber stream is heated to reduce the moisture content of the fibers to 10% or less.
Claim 17
Independent Claim
35 words
The method according to any of claims 9 to 14, wherein the fibers are calcined at a temperature in the range of 500°C to 1250°C, for example in the range of 650°C to 1100 C.
References Cited (Backward Citations)
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