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US5494618A
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Increasing the useful range of cationic photoinitiators in stereolithography
Assignee: 3D Systems Inc
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Filing: 1994-06-27
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Granted: 1996-02-27
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Expires: 2014-06-27
Abstract
Abstract Polymer precursor formulations suitable for stereolithography may be prepared from compositions containing vinyl ether functionalized compounds and epoxy functionalized compounds plus an effective amount of a cationic photoinitiator and an ultraviolet light-absorbing compound to provide a predetermined depth of cure. Preferably, the ultraviolet light-absorbing compound is anthracene or its derivatives.
Inventors
- 👤 Eugene V. Sitzmann
- 👤 Russell F. Anderson
- 👤 Darryl K. Barnes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:16
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/0037; B; B33; B33Y; B33Y70/00; G03F7/004; G03F7/027; G03F7/028; G03F7/029; G03F7/038; G03F7/09; G03F7/091
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
56 words
In the process of stereolithography in which a three-dimensional object is built up in successive layers by polymerizing cationically polymerizable monomers by the catalytic action of cationic photoinitiators activated by a moving beam of ultraviolet light, the improvement comprising adding ultraviolet light-absorbing compounds to said monomers in quantities sufficient to provide a predetermined depth of cure.
Claim 2
Dependent Claim
56 words
In the process of stereolithography in which a three-dimensional object is built up in successive layers by polymerizing cationically polymerizable monomers by the catalytic action of cationic photoinitiators activated by a moving beam of ultraviolet light, the improvement comprising adding ultraviolet light-absorbing compounds to said monomers in quantities sufficient to provide a predetermined depth of cure.
Claim 3
Dependent Claim
13 words
The process of claim 1 wherein said monomers comprise vinyl ethers and epoxides.
Claim 4
Dependent Claim
12 words
The process of claim 2 wherein said cationic photoinitiators are onium salts.
Claim 5
Dependent Claim
16 words
The process of claim 3 wherein said ultraviolet light is provided by an Argon ion laser.
Claim 6
Dependent Claim
15 words
The process of claim 4 wherein said ultraviolet absorbing compounds are anthracene and/or derivatives thereof.
Claim 7
Dependent Claim
22 words
The process of claim 1 wherein said ultraviolet light-absorbing compounds are present in less than 0.2 pph by weight of said monomers.
Claim 8
Dependent Claim
29 words
The process of claim 5 wherein said ultraviolet light-absorbing compounds are at least one member of the group consisting of anthracene, 9-anthroic acid, 9,10-diphenylanthracene, 9,10-dimethoxy-2-ethyl anthracene, and 9-anthracene methanol.
Claim 9
Dependent Claim
14 words
The process of claim 7 wherein said ultraviolet light-absorbing compound thereof is 9-anthracene methanol.
Claim 10
Dependent Claim
27 words
The process of claim 5 wherein said ultraviolet light-absorbing compounds are selected from the group consisting of 9-phenyl anthracene, 2-methyl anthracene, 9-vinyl anthracene, bianthranyl and 9,10-dinaphthyl anthracene.
Claim 11
Dependent Claim
13 words
The process of claim 4 wherein said ultraviolet light-absorbing compounds are stilbene derivatives.
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) | 1999-02-26 | 1999-08-28 | 2000-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-02-26 | 2003-08-28 | 2004-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-02-26 | 2007-08-28 | 2008-02-27 | $7700.00 | Window Closed / Lapsed |