US5167882A
Expired / Lapsed
US
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Stereolithography method
Assignee: Henkel Loctite Corp
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Filing: 1991-02-05
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Granted: 1992-12-01
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Expires: 2011-02-05
Abstract
Abstract An improved stereolithography method for building a three-dimensional article including the steps of patternwise curing successive layers of a bath of curable liquid resin formulation until the article has been completely built up, removing the article from the liquid resin bath and then post-curing the article, wherein the liquid resin is a "thiol/nene" formulation including: (a) a first compound having a plurality of norbornene groups thereon; (b) a second compound having a plurality of thiol groups therein; and (c) a free radical photoinitiator, the total functionality of the formulation being greater than 4.
Inventors
- 👤 Anthony F. Jacobine
- 👤 Margaret A. Rakas
- 👤 David M. Glaser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:24
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/027; G03F7/0275; B; B29; B29C; B29C64/00; B29C64/10; B29C64/106; B33; B33Y; B33Y70/00; C; C08; C08G; C08G75/00; C08G75/02; C08G75/04; C08G75/045; G03C; G03C9/00; G03C9/08; G03F7/0037; Y; Y10; Y10S; Y10S522/00; Y10S522/91
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
95 words
In a stereolithography method for building a three-dimensional article comprising the steps of patternwise curing successive layers of a bath of curable liquid resin formulation until the article has been completely built up, removing the article from the liquid resin bath and then post-curing the article, the improvement wherein the liquid resin is a thiol/nene formulation comprising: (a) a first compound having a plurality of norbornene groups thereon; (b) a second compound having a plurality of thiol groups therein; and (c) a free radical photoinitiator, the total functionality of the formulation being greater than 4.
Claim 2
Dependent Claim
95 words
In a stereolithography method for building a three-dimensional article comprising the steps of patternwise curing successive layers of a bath of curable liquid resin formulation until the article has been completely built up, removing the article from the liquid resin bath and then post-curing the article, the improvement wherein the liquid resin is a thiol/nene formulation comprising: (a) a first compound having a plurality of norbornene groups thereon; (b) a second compound having a plurality of thiol groups therein; and (c) a free radical photoinitiator, the total functionality of the formulation being greater than 4.
Claim 3
Dependent Claim
16 words
A method as in claim 1 wherein said first compound is a norbornene carboxylate polyol ester.
Claim 4
Dependent Claim
24 words
A method as in claim 2 wherein said first compound is a norbornene carboxylate ester of trimethylolpropane, hexanediol, ethoxylated bisphenol A or mixtures thereof.
Claim 5
Dependent Claim
17 words
A method as in claim 2 wherein said second compound is a α- or β-mercaptocarboxylate polyol ester.
Claim 6
Dependent Claim
22 words
A method as in claim 4 wherein said second compound is an α- or β-mercaptopropionate ester of tri or higher functional alcohol.
Claim 7
Dependent Claim
14 words
A method as in claim 5 wherein said second compound is pentaerythritol tetrakis β-mercaptopropionate.
Claim 8
Dependent Claim
18 words
A method as in claim 1 wherein the thickness of each said layer is less than 40 mils.
Claim 9
Dependent Claim
17 words
A method as in claim 7 wherein the said layer thickness is about 20 mils or less.
Claim 10
Dependent Claim
72 words
A method as in claim 7 wherein said patternwise curing is accomplished by successively tracing sectional images of said article onto the surface of the liquid resin with a UV laser bath to provide a cured sectional layer of said article on said bath surface and incrementally lowering the article one layer depth below the surface of the bath after each layer is cured until the entire article has been built up.
Claim 11
Dependent Claim
20 words
A method as in claim 1 wherein the thiol/nene formulation further comprises a shelf-life stabilizing effective amount of a polyiodide.
Claim 12
Dependent Claim
33 words
A method as in claim 10 wherein the polyiodide stabilizer is KI/I 2 in an approximate weight ratio of 1:2 and is present at a level of about 10-2,000 ppm I 2 .
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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) | 1995-12-01 | 1996-06-01 | 1996-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-12-01 | 2000-06-01 | 2000-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-12-01 | 2004-06-01 | 2004-12-01 | $7700.00 | Window Closed / Lapsed |