US3860556A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low water absorption dental restorative
Assignee: 3M Co
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Filing: 1971-11-01
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Granted: 1975-01-14
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Expires: 1991-11-01
Abstract
Abstract Dental compositions are provided of inorganic particulate material as filler, tertiary aromatic amine as accelerator and, as vehicles or binders, methacrylate or acrylate esters of hydroxyalkyl esters of aromatic diphenols. Polymerization is initiated in these combinations by free radical generating catalysts to give products which have low sensitivity to moisture and are usefully employed in dental cavities as fillings.
Inventors
- 👤 Charles W Taylor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:55
CPC Classifications
C; C08; C08F; C08F20/00; C08F20/02; C08F20/10; C08F20/12; C08F20/16; A; A61; A61K; A61K6/00; A61K6/80; A61K6/884; A61K6/887
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
12 words
The composition of claim 1 wherein the accelerator is N,N-bis(hydroxy-lower-alkyl)-p-toluidine or -3,5-xylidine.
Claim 2
Dependent Claim
124 words
A kit for preparing a moisture resistant dental filling comprising two components in which the total composition comprises about 65 to 80 percent of glassy or crystalline inorganic non-metallic particulate filler and catalyst together and about 35 to 20 percent of liquid polymerizable methacrylate or acrylate organic binder consisting essentially of 0.05 to 5 percent of mononuclear aromatic tertiary amine accelerator for free-radical polymerization and polycarbinol polymethacrylate substantially free from active hydrogen atoms and devoid of peroxides of the formula MO(DO)nX(OD)nOM wherein M is methacrylate or acrylate, D is unsubstituted alkylene of 2 to about 6 carbon atoms, n is 1 to 4 and X is the nucleus of a diphenol of at least two aromatic rings and from 12 to 24 carbon atoms.
Claim 3
Dependent Claim
22 words
A kit according to claim 3 having a dry component composed of particulate filler with any pigments and cAtalyst and liquid component.
Claim 4
Dependent Claim
25 words
A kit according to claim 3 having two paste components each comprising particulate filler and binder and one containing catalyst and the other containing accelerator.
Claim 5
Dependent Claim
15 words
A dental restorative composition according to claim 1 wherein the organic binder is (CH2 C(CH3)COOC2H4OC6H4)2C(CH3)2.
Claim 6
Dependent Claim
18 words
A kit according to claim 4 wherein the liquid component has a viscosity of less than 10,000 centipoises.
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) | 1978-01-13 | 1978-07-15 | 1979-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-13 | 1982-07-15 | 1983-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-13 | 1986-07-15 | 1987-01-14 | $7700.00 | Window Closed / Lapsed |