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EP0298501A2
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Composition for forming calcium phosphate type hardening material and process for producing such hardening material
Assignee: Pentax Corp
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Filing: 1988-07-08
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Granted: —
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Expires: 2008-07-08
Abstract
Abstract A composition for forming a calcium phosphate type hardening material comprising (1) powder comprising at least one of α-tricalcium phosphate and tetracalcium phosphate, (2) an acidic aqueous solution, and (3) a polysaccharide.
Inventors
- 👤 Masaya C/O Asahi Kogaku Kogyo K.K. Sumita
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 18:16
CPC Classifications
A; A61; A61L; A61L24/00; A61L24/0047; A61L24/0073; A61L24/0084; A61K; A61K6/00; A61K6/50; A61K6/54; A61K6/80; A61K6/831; A61K6/838; A61K6/849; A61K6/864; A61L27/00; A61L27/02; A61L27/12; A61L27/40; A61L27/44; C; C01; C01B; C01B25/00; C01B25/16; C01B25/26; C01B25/32; C01B25/327; C04; C04B; C04B28/00; C04B28/34; C04B28/344; A61F; A61F2310/00; A61F2310/00005; A61F2310/00179; A61F2310/00293
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
32 words
A composition for forming a calcium phosphate type hardening material comprising (1) powder comprising at least one of α-tricalcium phosphate and tetracalcium phosphate, (2) an acidic aqueous solution, and (3) a polysaccharide.
Claim 2
Dependent Claim
32 words
A composition for forming a calcium phosphate type hardening material comprising (1) powder comprising at least one of α-tricalcium phosphate and tetracalcium phosphate, (2) an acidic aqueous solution, and (3) a polysaccharide.
Claim 3
Dependent Claim
17 words
A composition as claimed in claim 1, wherein said polysaccharide is dissolved in said acidic aqueous solution.
Claim 4
Dependent Claim
24 words
A composition as claimed in claim 1, wherein said acidic aqueous solution is an aqueous solution of an inorganic acid or an organic acid.
Claim 5
Dependent Claim
37 words
A composition as claimed in claim 3, wherein said organic acid is selected from the group consisting of acetic acid, lactic acid, citric acid, malic acid, malonic acid, succinic acid, glutaric acid, tartaric acid, and polyacrylic acid.
Claim 6
Dependent Claim
22 words
A composition as claimed in claim 1, wherein the acid concentration of said acidic aqueous solution is about 25 wt% or more.
Claim 7
Dependent Claim
23 words
A composition as claimed in claim 4, wherein the acid concentration of said acidic aqueous solution is from about 25 to 55 wt%.
Claim 8
Dependent Claim
68 words
A composition as claimed in claim 6, wherein said acidic aqueous solution is selected from the group consisting of a citric acid solution having an acid concentration of about 40 wt%, a malic acid solution having an acid concentration of about 40 wt%, a phosphoric acid solution having an acid concentration of about 40 wt%, and a polyacrylic acid solution having an acid concentration of about 25 wt%.
Claim 9
Dependent Claim
12 words
A composition as claimed in claim 1, wherein said polysaccharide is chitosan.
Claim 10
Dependent Claim
23 words
A composition as claimed in claim 2, wherein the concentration of said polysaccharide in said aqueous solution is about 0.05 wt% or more.
Claim 11
Dependent Claim
26 words
A composition as claimed in claim 1, wherein the ratio of said powder to said acidic aqueous solution is from about 0.4 to 2.7 by weight.
Claim 12
Dependent Claim
26 words
A composition as claimed in claim 10, wherein the ratio of said powder to said acidic aqueous solution is from about 0.4 to 2.0 by weight.
Claim 13
Dependent Claim
19 words
A composition as claimed in claim 1, wherein said powder is a mixture of α-tricalcium phosphate and tetracalcium phosphate.
Claim 14
Dependent Claim
46 words
A composition as claimed in claim 12, wherein said powder is produced by the step of calcining, at a temperature of from about 1,150°C to 1,450°C under reduced pressure, a hydroxyapatite having a molar ratio of Ca/P of about 1.8 or less and more than 1.5.
Claim 15
Dependent Claim
36 words
A composition as claimed in claim 13, wherein said acidic aqueous solution is an aqueous solution of citric acid containing at least one of a monosaccharide, an oligosasccharide, and a sugaralcohol; and said polysaccharide is chitosan.
Claim 16
Dependent Claim
22 words
A composition as claimed in claim 13, wherein said hydroxyapatite has a molar ratio of Ca/P of from about 1.6 to 1.8.
Claim 17
Dependent Claim
21 words
A composition as claimed in claim 13, wherein said hydroxyapatite is calcined under a pressure of about 10 Pa or less.
Claim 18
Dependent Claim
21 words
A composition as claimed in claim 16, wherein said hydroxyapatite is calcined under a pressure of about 10⁻² Pa or less.
Claim 19
Dependent Claim
25 words
A composition as claimed in claim 1, wherein said acidic aqueous solution contains at least one of glycerin, a monosaccharide, an oligosaccharide, and a sugaralcohol.
Claim 20
Dependent Claim
35 words
A composition as claimed in claim 18, wherein the concentration of said at least one of glycerin, a monosaccharide, an oligosaccaride, and a sugaralcohol in said acidic aqueous solution is about 40 wt% or less.
Claim 21
Dependent Claim
36 words
A composition as claimed in claim 19, wherein the concentration of said at least one of glycerin, a monosaccharide, an oligosaccaride, and a sugaralcohol in said acidic aqueous solution is about from 5 to 40 wt%.
Claim 22
Dependent Claim
36 words
A composition as claimed in claim 20, wherein the concentration of said at least one of glycerin, a monosaccharide, an oligosaccaride, and a sugaralcohol in said acidic aqueous solution is about from 10 to 30 wt%.
Claim 23
Dependent Claim
38 words
A process for producing a calcium phosphate type hardening material comprising the step of mixing (1) powder comprising at least one of α-tricalcium phosphate and tetracalcium phosphate and (2) an acidic aqueous solution containing a polysaccharide dissolved therein.
Claim 24
Dependent Claim
38 words
A process for producing a calcium phosphate type hardening material comprising the step of mixing (1) powder comprising at least one of α-tricalcium phosphate and tetracalcium phosphate and (2) an acidic aqueous solution containing a polysaccharide dissolved therein.
Claim 25
Dependent Claim
55 words
A process for producing a calcium phosphate type powder comprising the step of calcining, at a temperature of from about 1,150°C to 1,450°C under reduced pressure, a hydroxyapatite having a molar ratio of Ca/P of about 1.8 or less and more than 1.5 so as to produce a mixture of α-tricalcium phosphate and tetracalcium phosphate.
Claim 26
Dependent Claim
55 words
A process for producing a calcium phosphate type powder comprising the step of calcining, at a temperature of from about 1,150°C to 1,450°C under reduced pressure, a hydroxyapatite having a molar ratio of Ca/P of about 1.8 or less and more than 1.5 so as to produce a mixture of α-tricalcium phosphate and tetracalcium phosphate.
References Cited (Backward Citations)
No citation records indexed.
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