US4525256A
Expired / Lapsed
US
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Photopolymerizable composition including catalyst comprising diketone plus 4-(N,N-dimethylamino)benzoic acid or ester thereof
Assignee: Dentsply Research and Development Corp
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Filing: 1983-07-01
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Granted: 1985-06-25
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Expires: 2003-07-01
Abstract
Abstract There is described a photopolymerizable composition which contains at least one olefinically unsaturated compound and a photosensitive catalyst containing a diketone plus 4-(N,N-dimethylamino)benzoic acid or lower alkyl ester thereof.
Inventors
- 👤 Brian Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:07
CPC Classifications
C; C08; C08F; C08F2/00; C08F2/46; C08F2/48; C08F2/50; A; A61; A61K; A61K6/00; A61K6/80; A61K6/884; A61K6/887; G; G03; G03F; G03F7/00; G03F7/004; G03F7/027; G03F7/028; G03F7/031; Y; Y10; Y10S; Y10S430/00; Y10S430/1053; Y10S430/1055; Y10S430/114; Y10S430/12; Y10S502/00; Y10S502/522
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
46 words
A photopolymerizable composition comprising at least one olefinically unsaturated compound and a catalytically effective amount of a photosensitive system consisting essentially of: (a) an effective amount of at least one vicinal diketone compound; and (b) an effective amount of 4-(N,N-dimethylamino)benzoic acid or lower alkyl ester thereof.
Claim 2
Dependent Claim
46 words
A photopolymerizable composition comprising at least one olefinically unsaturated compound and a catalytically effective amount of a photosensitive system consisting essentially of: (a) an effective amount of at least one vicinal diketone compound; and (b) an effective amount of 4-(N,N-dimethylamino)benzoic acid or lower alkyl ester thereof.
Claim 3
Dependent Claim
27 words
The photopolymerizable composition of claim 1 comprising a dental restorative composition, wherein the olefinically unsaturated compound comprises a compound containing at least two acrylate or methacrylate groups.
Claim 4
Dependent Claim
16 words
The photopolymerizable composition of claim 1 wherein the diketone is camphoroquinone, benzil, biacetyl, or mixture thereof.
Claim 5
Dependent Claim
16 words
The photopolymerizable composition of claim 2 wherein the diketone is camphoroquinone, benzil, biacetyl, or mixture thereof.
Claim 6
Dependent Claim
13 words
The photopolymerizable composition of claim 1 wherein said component (b) is ethyl 4-(N,N-dimethylamino)benzoate.
Claim 7
Dependent Claim
13 words
The photopolymerizable composition of claim 2 wherein said component (b) is ethyl 4-(N,N-dimethylamino)benzoate.
Claim 8
Dependent Claim
13 words
The photopolymerizable composition of claim 3 wherein said component (b) is ethyl 4-(N,N-dimethylamino)benzoate.
Claim 9
Dependent Claim
13 words
The photopolymerizable composition of claim 4 wherein said component (b) is ethyl 4-(N,N-dimethylamino)benzoate.
Claim 10
Dependent Claim
18 words
The photopolymerizable composition of claim 2 wherein the catalyst is a mixture of benzil, camphoroquinone, and ethyl 4-(N,N-dimethylamino)benzoate.
Claim 11
Dependent Claim
80 words
The photopolymerizable composition of claim 1 wherein said vicinal diketone compound is employed in an amount within the range of from about 0.1 to about 5 weight percent, based on weight of olefinically unsaturated compound, wherein said 4-(N,N-dimethylamino)benzoic acid or lower alkyl ester thereof is employed in an amount within the range of from about 0.1 to about 5 weight percent, based on weight of olefinically unsaturated compound, and wherein said lower alkyl is C 1 to C 4 alkyl.
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) | 1988-06-24 | 1988-12-24 | 1989-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-24 | 1992-12-24 | 1993-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-24 | 1996-12-24 | 1997-06-25 | $7700.00 | Window Closed / Lapsed |