US5155158A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Moldable ceramic compositions
Assignee: CNA Holdings LLC
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Filing: 1989-11-07
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Granted: 1992-10-13
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Expires: 2009-11-07
Abstract
Abstract A ceramic composition which can be extrusion or injection molded to ceramic greenbodies comprises a sinterable powder mixed within a polyacetal binder and further includes a dispersing aid comprising a polyester oligomer formed by self condensation of a hydroxy fatty acid in which the hydroxy group is attached to an internal carbon atom of the fatty acid. The dispersing aid also acts as a stabilizer for the polyacetal binder during compounding with the powder.
Inventors
- 👤 Hongkyu Kim
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:15
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/622; C04B35/626; C04B35/63; C04B35/632; C04B35/634; C04B35/63404; C04B35/6342; C04B35/63448; C04B35/6346; C08; C08L; C08L59/00; C08L67/00
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
46 words
An essentially solvent-free ceramic molding composition comprising a sinterable powder, a polyacetal binder and a dispersing aid comprising a polyester oligomer formed by self condensation of a hydroxy fatty acid in which the hydroxy group is attached to an internal carbon atom of said fatty acid.
Claim 2
Dependent Claim
46 words
An essentially solvent-free ceramic molding composition comprising a sinterable powder, a polyacetal binder and a dispersing aid comprising a polyester oligomer formed by self condensation of a hydroxy fatty acid in which the hydroxy group is attached to an internal carbon atom of said fatty acid.
Claim 3
Dependent Claim
18 words
The composition of claim 1 wherein said hydroxy fatty acid contains from about 12 to 36 carbon atoms.
Claim 4
Dependent Claim
25 words
The composition of claim 2 wherein said hydroxy group is not contained within the 4 carbon atoms from the end of the fatty acid chain.
Claim 5
Dependent Claim
15 words
The composition of claim 1 wherein said dispersing aid is formed from hydroxy stearic acid.
Claim 6
Dependent Claim
25 words
The composition of claim 4 wherein said hydroxy group is not contained within the 4 carbon atoms from the end of the fatty acid chain.
Claim 7
Dependent Claim
12 words
The composition of claim 1 wherein said polyester oligomer contains amide groups.
Claim 8
Dependent Claim
21 words
The composition of claim 1 wherein said dispersing aid is present in amounts of from about 1 to 10 vol. %.
Claim 9
Dependent Claim
21 words
The composition of claim 7 wherein said dispersing aid is present in amounts of from about 2.5 to 5 vol. %.
Claim 10
Dependent Claim
12 words
The composition of claim 1 wherein said polyacetal binder comprises oxymethylene units.
Claim 11
Dependent Claim
16 words
The composition of claim 9 wherein said polyacetal contains at least 50 mol % oxymethylene units.
Claim 12
Dependent Claim
27 words
The composition of claim 9 wherein said polyacetal is a copolymer containing oxymethylene units and oxyalkylene units wherein said alkylene group contains at least 2 carbon atoms.
Claim 13
Dependent Claim
25 words
The composition of claim 11 wherein said polyacetal binder comprises a copolymer containing at least 50 mol % oxymethylene units and the remainder oxyethylene units.
Claim 14
Dependent Claim
31 words
The composition of claim 1 wherein said sinterable powder is selected from the group consisting of aluminum oxide, zirconium oxide, silicon dioxide, silicon nitride, silicon carbide, silicon, ferrite and mixtures thereof.
Claim 15
Dependent Claim
11 words
The composition of claim 13 wherein said sinterable powder is silicon.
Claim 16
Dependent Claim
21 words
The composition of claim 1 wherein said polyacetal binder comprises from about 10 to 50 wt. % of said ceramic composition.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-10-13 | 1996-04-13 | 1996-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-10-13 | 2000-04-13 | 2000-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-10-13 | 2004-04-13 | 2004-10-13 | $7700.00 | Window Closed / Lapsed |