US5496682A
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US
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Three dimensional sintered inorganic structures using photopolymerization
Assignee: WR Grace and Co Conn
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Filing: 1993-10-15
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Granted: 1996-03-05
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Expires: 2013-10-15
Abstract
Abstract Dense sintered parts of ceramic and/or metallic materials are formed using stereo photolithography. An initial flowable mixture of sinterable inorganic particles, photocurable monomer, photoinitiator and dispersant is flowed over a substrate and cured in a selective pattern. Subsequent layers of the mixture are flowed over the substrate and cured to build a three dimensional body. The body is then fired to produce a dense sintered part. Parts having in excess of 95% of theoretical density can be produced.
Inventors
- 👤 Tariq Quadir
- 👤 Srinivas K. Mirle
- 👤 John S. Hallock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:29
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/0037; B; B22; B22F; B22F10/00; B22F10/10; B22F10/12; B22F12/00; B22F12/40; B33; B33Y; B33Y70/00; B33Y70/10; G03F7/004; G03F7/0047; G03F7/027; Y; Y02; Y02P; Y02P10/00; Y02P10/25
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
67 words
A photocurable composition suitable for the formation of three dimensional sintered bodies by stereo photolithography, said composition comprising: 40-70 vol. % sinterable ceramic and/or metallic particles, 10-35 wt. % photocurable monomer based on the weight of the sinterable particles, 1-10 wt. % photocurable monomer based on the weight of the monomer, 1-10 wt. % dispersant based on the weight of the sintered particles, and a coupling agent.
Claim 2
Dependent Claim
67 words
A photocurable composition suitable for the formation of three dimensional sintered bodies by stereo photolithography, said composition comprising: 40-70 vol. % sinterable ceramic and/or metallic particles, 10-35 wt. % photocurable monomer based on the weight of the sinterable particles, 1-10 wt. % photocurable monomer based on the weight of the monomer, 1-10 wt. % dispersant based on the weight of the sintered particles, and a coupling agent.
Claim 3
Dependent Claim
12 words
The composition of claim 1 wherein said composition further contains a plasticizer.
Claim 4
Dependent Claim
22 words
The composition of claim 2 wherein said plasticizer is present at about 20-40 wt. % based on the weight of said monomer.
Claim 5
Dependent Claim
20 words
The composition of claim 2 wherein said plasticizer is selected from the group consisting of tripropylene glycol and glycerol trioleate.
Claim 6
Dependent Claim
13 words
The composition of claim 1 wherein said monomer comprises one or more acrylates.
Claim 7
Dependent Claim
27 words
The composition of claim 5 wherein said monomer includes a monomer selected from the group consisting of 2(2-ethoxyethoxy) ethylacrylate, trimethylolpropane triacrylate, ethoxylated trimethylolpropane triacrylate, and mixtures thereof.
Claim 8
Dependent Claim
24 words
The composition of claim 1 wherein said photoinitiator is selected from the group consisting of trimethyl benzophenone, alpha hydroxyketone, isopropylthioxanthone, 2-methyl-1-[4-(methylthio)phenyl]-2-morpholinopropanone-1 and mixtures thereof.
Claim 9
Dependent Claim
13 words
The composition of claim 1 wherein said dispersant is a fatty propylenediamine dioleate.
Claim 10
Dependent Claim
24 words
The composition of claim 1 wherein said coupling agent is present at about 0.5-2.0 wt. % based on the weight of said sinterable particles.
Claim 11
Dependent Claim
24 words
The composition of claim 1 wherein said coupling agent is a silane selected from the group consisting of gamma-methacryloxypropyltrimethoxysilane and 3-acryloxypropyl-trimethoxysilane and mixtures thereof.
Claim 12
Dependent Claim
17 words
The composition of claim 1 wherein said composition contains about 50-60 vol. % of said sinterable powder.
Claim 13
Dependent Claim
26 words
The composition of claim 1 wherein said sinterable particles are ceramic particles selected from the group consisting of alumina, tetragonal zirconia, silicon nitride and mixtures thereof.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-03-05 | 1999-09-04 | 2000-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-03-05 | 2003-09-04 | 2004-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-03-05 | 2007-09-04 | 2008-03-05 | $7700.00 | Window Closed / Lapsed |