EP0335359A2
Expired / Lapsed
EP
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Porous ceramic material and production process thereof
Assignee: Pentax Corp
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Filing: 1989-03-29
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Granted: —
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Expires: 2009-03-29
Abstract
Abstract Porous ceramic materials which are useful as a biomaterial such as an artificial bone, a transcutaneous etc. They are produced from a green compact which is produced by compression molding of a blend of a raw ceramic material and a sublimable binder by removing said binder from the green compact through sublimation thereof. They can exhibit a widely controllable porosity and have a good mechanical strength. A simple and easy process for the production of said porous ceramic materials is also provided.
Inventors
- 👤 Satoshi C/O Asahi Kogaku Kogyo K.K. Ojima
- 👤 Tetsuro C/O Asahi Kogaku Kogyo K.K. Ogawa
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 22:20
CPC Classifications
A; A61; A61L; A61L27/00; A61L27/02; A61L27/12; A61K; A61K6/00; A61K6/50; A61K6/58; A61K6/70; A61K6/71; A61K6/74; A61K6/75; A61K6/80; A61K6/884; A61K6/891; A61L27/50; A61L27/56; C; C04; C04B; C04B38/00; C04B38/06; C04B38/063; C04B38/0635; C04B38/0645; C04B38/068; A61F; A61F2310/00; A61F2310/00005; A61F2310/00179; A61F2310/00293; C04B2111/00; C04B2111/00474; C04B2111/00836
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
79 words
A porous ceramic material produced by heating a green compact which is produced by compression molding of a blend of raw material of said ceramic material and a binder consisting of at least one sublimable material selected from the group consisting of condensed cycloaliphatic hydrocarbons and halogenated aromatic hydrocarbons to remove said binder through sublimation thereof, a porosity of said ceramic material being adjusted to a desired value by controlling an amount of said binder used in said blend.
Claim 2
Dependent Claim
79 words
A porous ceramic material produced by heating a green compact which is produced by compression molding of a blend of raw material of said ceramic material and a binder consisting of at least one sublimable material selected from the group consisting of condensed cycloaliphatic hydrocarbons and halogenated aromatic hydrocarbons to remove said binder through sublimation thereof, a porosity of said ceramic material being adjusted to a desired value by controlling an amount of said binder used in said blend.
Claim 3
Dependent Claim
40 words
The ceramic material as claimed in claim 1 wherein said raw ceramic material is used in the form of powders and comprises calcium phosphates such as tricalcium phosphate, apatites, for example, hydroxyapatite, fluoroapatite, and the like, or a mixture thereof.
Claim 4
Dependent Claim
20 words
The ceramic material as claimed in claim 1 wherein said binder comprises adamantane, trimethylene norbornane, p-dichlorobenzene or a mixture thereof.
Claim 5
Dependent Claim
29 words
The ceramic material as claimed in claim 1 wherein said binder comprises a mixture of the sublimable materials which contains adamantane or trimethylene norbornane as a major component thereof.
Claim 6
Dependent Claim
19 words
The ceramic material as claimed in claim 1 wherein said binder comprises a mixture of adamantane and trimethylene norbornane.
Claim 7
Dependent Claim
30 words
The ceramic material as claimed in claim 1 wherein said binder is used in an amount of 10 to 80% by weight based on a total weight of said blend.
Claim 8
Dependent Claim
32 words
The ceramic material as claimed in claim 1 wherein the resulting porous ceramic material after molding is further sintered at a seleted sintering temperature which depends on a specific ceramic material used.
Claim 9
Dependent Claim
15 words
The ceramic material as claimed in claim 1 which is used to treat osseous defects.
Claim 10
Dependent Claim
15 words
The ceramic material as claimed in claim 1 which is used as an implant material.
Claim 11
Dependent Claim
22 words
The ceramic material as claimed in claim 1 which is used as an artificial denture part in the field of oral surgery.
Claim 12
Dependent Claim
21 words
The ceramic material as claimed in claim 1 which is used as an artificial bone part in the field of orthopaedics.
Claim 13
Dependent Claim
98 words
A process for the production of a porous ceramic material which comprises the steps of: mixing a raw ceramic material with a binder consisting of at least one sublimable material selected from the group consisting of condensed cycloaliphatic hydrocarbons and halogenated aromatic hydrocarbons which is added in an amount effective to provide a desired porosity through sublimation of the binder, molding the blend to a green compact having a desired configuration, and heating the green compact to over a thermal decomposition temperature of said binder to produce a porous product as a result of sublimation of said binder.
Claim 14
Dependent Claim
98 words
A process for the production of a porous ceramic material which comprises the steps of: mixing a raw ceramic material with a binder consisting of at least one sublimable material selected from the group consisting of condensed cycloaliphatic hydrocarbons and halogenated aromatic hydrocarbons which is added in an amount effective to provide a desired porosity through sublimation of the binder, molding the blend to a green compact having a desired configuration, and heating the green compact to over a thermal decomposition temperature of said binder to produce a porous product as a result of sublimation of said binder.
Claim 15
Dependent Claim
17 words
The process as claimed in claim 12 wherein fabrication is carried out before or after heating step.
Claim 16
Dependent Claim
32 words
The process as claimed in claim 12 or claim 13 which further comprises sintering the resulting porous ceramic material at a selected sintering temperature which depends on a specific ceramic material used.
Claim 17
Dependent Claim
39 words
The process as claimed in claim 12 or claim 13 wherein said raw ceramic material is used as powders and comprises calcium phosphates such as tricalcium phosphate, apatites, for example, hydroxyapatite, fluoroapatite, and the like, or a mixture thereof.
Claim 18
Dependent Claim
22 words
The process as claimed in claim 12 or claim 13 wherein said binder comprises adamantane, trimethylene norbornane, p-dichlorobenzene or a mixture thereof.
Claim 19
Dependent Claim
31 words
The process as claimed in claim 12 or claim 13 where said binder combrises a mixture of the sublimable materials which contains adamantane or trimethylene norbornane as a major component thereof.
Claim 20
Dependent Claim
21 words
The process as claimed in claim 12 or claim 13 wherein said binder comprises a mixture of adamantane and trimethylene norbornane.
Claim 21
Dependent Claim
37 words
The process as claimed in claim 12 or claim 13 wherein the amount of said binder added to said raw ceramic material is 10 to 80% by weight based on a total weight of the resulting blend.
Claim 22
Dependent Claim
23 words
The process as claimed in claim 12 or claim 13 wherein molding is carried out in a dry process using an isostatic press.
Claim 23
Dependent Claim
38 words
A green compact produced by compression molding of a blend of a raw ceramic material and a binder consisting of at least one sublimable material selected from the group consisting of condensed cycloaliphatic hydrocarbons and halogenated aromatic hydrocarbons.
Claim 24
Dependent Claim
38 words
A green compact produced by compression molding of a blend of a raw ceramic material and a binder consisting of at least one sublimable material selected from the group consisting of condensed cycloaliphatic hydrocarbons and halogenated aromatic hydrocarbons.
Claim 25
Dependent Claim
40 words
The green compact as claimed in claim 21 wherein said raw ceramic material is used in the form of powders and comprises calcium phosphates such as tricalcium phosphate, apatites, for example, hydroxyapatite, fluoroapatite, and the like, or a mixture thereof.
Claim 26
Dependent Claim
20 words
The green compact as claimed in claim 21 wherein said binder comprises adamantane, trimethylene norbornane, p-dichlorobenzene or a mixture thereof.
Claim 27
Dependent Claim
29 words
The green compact as claimed in claim 21 wherein said binder comprises a mixture of the sublimable materials which contains adamantane or trimethylene norbornane as a major component thereof.
Claim 28
Dependent Claim
19 words
The green compact as claimed in claim 21 wherein said binder comprises a mixture of adamantane and trimethylene norbornane.
Claim 29
Dependent Claim
30 words
The green compact as claimed in claim 21 wherein said binder is used in an amount of 10 to 80% by weight based on a total weight of said blend.
References Cited (Backward Citations)
No citation records indexed.
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