US4359565A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vinylsilicone pastes for dental impression
Assignee: Bayer AG
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Filing: 1981-07-29
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Granted: 1982-11-16
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Expires: 2001-07-29
Abstract
Abstract In a polysiloxane-based dental composition which crosslinks by an addition reaction and hardens at room temperature, the composition comprising (a) an organopolysiloxane with at least two vinyl groups in the molecule, (b) an organohydridopolysiloxane, (c) a catalyst to accelerate the addition reaction, and (d) a hydrophobic filler, the improvement which comprises including therein (e) an aluminosilicate containing finely divided palladium. This removes any by-product hydrogen and results in a smoother surface on any plaster of Paris moldings made from the hardened composition.
Inventors
- 👤 Lothar Puppe
- 👤 Reiner Voigt
- 👤 Manfred Borgardt
- 👤 Hans-Heinrich Moretto
- 👤 Bernard Munchenbach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:59
CPC Classifications
A; A61; A61K; A61K6/00; A61K6/90; G; G02; G02B; G02B6/00; G02B6/44; G02B6/4401; G02B6/4429; G02B6/44382
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
60 words
In a polysiloxane-based dental composition which crosslinks by an addition reaction and hardens at room temperature, the composition comprising (a) an organopolysiloxane with at least two vinyl groups in the molecule, (b) an organohydridopolysiloxane, (c) a catalyst to accelerate the addition reaction, and (d) a hydrophobic filler, the improvement which comprises including therein (e) an aluminosilicate containing finely divided palladium.
Claim 2
Dependent Claim
60 words
In a polysiloxane-based dental composition which crosslinks by an addition reaction and hardens at room temperature, the composition comprising (a) an organopolysiloxane with at least two vinyl groups in the molecule, (b) an organohydridopolysiloxane, (c) a catalyst to accelerate the addition reaction, and (d) a hydrophobic filler, the improvement which comprises including therein (e) an aluminosilicate containing finely divided palladium.
Claim 3
Dependent Claim
14 words
A composition according to claim 1, wherein the palladium is present as an alloy.
Claim 4
Dependent Claim
15 words
A composition according to claim 1, wherein the aluminosilicate is zeolite of the faujasite type.
Claim 5
Dependent Claim
14 words
A composition according to claim 1, containing about 0.5 to 100 ppm of palladium.
Claim 6
Dependent Claim
32 words
A composition according to claim 3, wherein the aluminosilicate is present in about 0.1 to 5% by weight of the composition and it contains about 0.01 to 5% by weight of palladium.
References Cited (Backward Citations)
US3950300A
Cited
FR2262955B1
Cited
US4035453A
Cited
FR2400052B1
Cited
DE2926405A1
Cited
US4273902A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-11-15 | 1986-05-17 | 1986-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-11-15 | 1990-05-17 | 1990-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-11-15 | 1994-05-17 | 1994-11-16 | $7700.00 | Window Closed / Lapsed |