Patent US4443587A successfully refreshed from Google Patents.
US4443587A
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1,2,6-Thiadiazine-3,5-dione-1,1-dioxides and their use as polymerization accelerators
Assignee: Abitz Morf Gritschneder
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Filing: 1982-02-18
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Granted: 1984-04-17
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Expires: 2002-02-18
Abstract
Abstract 1,2,6-Thiadiazine-3,5-dione-1,1-dioxides of the general formula ##STR1## wherein each R and R 3 independently may be substituted or unsubstituted alkyl, alkenyl or substituted cycloalkyl are described. These compounds, as well as those wherein the R substituents additionally may be cycloalkyl or substituted or unsubstituted aryl, are useful as accelerators for the peroxidic polymerization of ethylenically unsaturated compounds, such as methacrylic acid compounds, and have particular utility in dental compositions.
Inventors
- 👤 Werner Schmitt
- 👤 Robert Purrmann
- 👤 Peter Jochum
- 👤 Heinz-Joachim Hubner
- 👤 Bernd Burger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:12
CPC Classifications
C; C07; C07D; C07D285/00; C07D285/15; C07D285/16; A; A61; A61K; A61K6/00; A61K6/80; A61K6/884; A61K6/887; C08; C08F; C08F2/00; C08F2/38; C08F2/40
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
98 words
In a method for the peroxidic polymerization of ethylenically unsaturated compounds selected from the group consisting of acrylic and methacrylic acid compounds useful in the formation of dental type molded articles including the steps of mixing such ethylenically unsaturated compounds with a peroxidic initiator and accelerator and polymerizing the resulting mixture in a mold, the improvement comprising use of a compound of the formula ##STR6## wherein R 4 and R 5 independently are alkyl, substituted alkyl, alkenyl, cycloalkyl, substituted cycloalkyl, aryl, or substituted aryl, and R 3 is alkyl, substituted alkyl, alkenyl, or substituted cycloalkyl, as an accelerator.
Claim 2
Dependent Claim
98 words
In a method for the peroxidic polymerization of ethylenically unsaturated compounds selected from the group consisting of acrylic and methacrylic acid compounds useful in the formation of dental type molded articles including the steps of mixing such ethylenically unsaturated compounds with a peroxidic initiator and accelerator and polymerizing the resulting mixture in a mold, the improvement comprising use of a compound of the formula ##STR6## wherein R 4 and R 5 independently are alkyl, substituted alkyl, alkenyl, cycloalkyl, substituted cycloalkyl, aryl, or substituted aryl, and R 3 is alkyl, substituted alkyl, alkenyl, or substituted cycloalkyl, as an accelerator.
Claim 3
Dependent Claim
28 words
The method of claim 1 wherein the accelerator compound is present in an amount from 0.1 to 15% by weight based upon the ethylenically unsaturated compound being polymerized.
Claim 4
Dependent Claim
21 words
The method of claim 1 wherein the peroxo catalyst is selected from the group consisting of benzoyl peroxide and lauroyl peroxide.
Claim 5
Dependent Claim
34 words
The method of claim 1 wherein the polymerization is effected in the presence of 1 to 200 ppm heavy metal compound and 0.01 to 1% by weight ionic halogen or pseudohalogen as additional accelerators.
Claim 6
Dependent Claim
17 words
The method of claim 4 wherein the heavy metal is copper and the ionic halogen is chloride.
Claim 7
Dependent Claim
13 words
The method of claim 1 wherein the methacrylic acid compound is an ester.
Claim 8
Dependent Claim
26 words
The method of claim 1 wherein the ethylenically unsaturated compounds and the accelerator are mixed and are polymerized in a mold to form a dental device.
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) | 1987-04-17 | 1987-10-17 | 1988-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-04-17 | 1991-10-17 | 1992-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-04-17 | 1995-10-17 | 1996-04-17 | $7700.00 | Window Closed / Lapsed |