Patent US4933202A successfully refreshed from Google Patents.
US4933202A
Expired / Lapsed
US
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Method of improving the adhesion of plastics to metals in dental prostheses
Assignee: Ivoclar AG
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Filing: 1989-01-19
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Granted: 1990-06-12
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Expires: 2009-01-19
Abstract
Abstract In a process for improving the adhesion of plastics to metals in the production of dental prostheses, in which a silicon dioxide layer is applied to the metal surface and subsequently silanized and then the plastic and metal bonded together the improvement consisting essentially of, forming the silicon dioxide layer by (1) applying a silica sol or dispersion of very finely divided silica to the metal surface and (2) baking the sol or dispersion at a temperature of 100° to 800° C.
Inventors
- 👤 Volker Rheinberger
- 👤 Peter Wollwage
- 👤 Gerhard Zanghellini
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:38
CPC Classifications
A; A61; A61C; A61C13/00; A61C13/0003; A61K; A61K6/00; A61K6/15; A61K6/16; A61K6/17; A61K6/20; A61K6/80; A61K6/84; A61K6/849; A61K6/871; B; B05; B05D; B05D3/00; B05D3/10; B05D3/102
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
82 words
In a process for improving the adhesion of plastics to metals in the production of dental prostheses, in which a silicon dioxide layer is applied to the metal surface and subsequently silanized and then the plastic and metal bonded together the improvement consisting essentially of, forming the silicon dioxide layer by (1) applying a silica sol or dispersion of very finely divided silica to the metal surface and (2) baking the sol or dispersion at a temperature of 100° to 800° C.
Claim 2
Dependent Claim
82 words
In a process for improving the adhesion of plastics to metals in the production of dental prostheses, in which a silicon dioxide layer is applied to the metal surface and subsequently silanized and then the plastic and metal bonded together the improvement consisting essentially of, forming the silicon dioxide layer by (1) applying a silica sol or dispersion of very finely divided silica to the metal surface and (2) baking the sol or dispersion at a temperature of 100° to 800° C.
Claim 3
Dependent Claim
18 words
Process according to claim 1, characterized in that a baking temperature of 300° to 800° C. is used.
Claim 4
Dependent Claim
18 words
Process according to claim 1, characterized in that a baking time of 2 to 20 minutes is chosen.
Claim 5
Dependent Claim
15 words
Process according to claim 1, characterized in that the metal surface is pretreated by sandblasting.
Claim 6
Dependent Claim
26 words
Process according to claim 1, characterized in that use is made of a silica sol with an average primary particle size of 5 to 150 nm.
Claim 7
Dependent Claim
24 words
Process according to claim 1, characterized in that a silica dispersion with an average primary particle size of 5 to 50 nm is used.
Claim 8
Dependent Claim
27 words
Process according to one of the claims 1 to 5, characterized in that water and/or alcohol is used as the dispersant for the silica sol or dispersion.
Claim 9
Dependent Claim
28 words
Process according to one of the claims 1 to 6, characterized in that inorganic fluorine compounds, particularly K 2 ZrF 6 are used for stabilizing the silica dispersion.
Claim 10
Dependent Claim
91 words
A process for bonding plastic to metal in the production of dental prosthesis, the steps consisting essentially of: a. sandblasting the metal surface to be bonded to plastic; b. forming a silica sol or a dispersion of very finely divided silica; c. applying the sol or dispersion to the sandblasted metal surface to form a coating of the sol or dispersion thereon; d. baking the sol or dispersion coating at a temperature 100° to 800° C.; e. silanizing the baked silica coating; and f. bonding the plastic to the metal surface.
Claim 11
Dependent Claim
91 words
A process for bonding plastic to metal in the production of dental prosthesis, the steps consisting essentially of: a. sandblasting the metal surface to be bonded to plastic; b. forming a silica sol or a dispersion of very finely divided silica; c. applying the sol or dispersion to the sandblasted metal surface to form a coating of the sol or dispersion thereon; d. baking the sol or dispersion coating at a temperature 100° to 800° C.; e. silanizing the baked silica coating; and f. bonding the plastic to the metal surface.
Claim 12
Dependent Claim
16 words
A process according to claim 9 wherein the baking temperature is from 300° to 800° C.
Claim 13
Dependent Claim
16 words
A process according to claim 9 wherein the baking time is from 2 to 20 minutes.
Claim 14
Dependent Claim
23 words
A process according to claim 9 wherein a silica sol is utilized having an average primary particle size of 5 to 150 nm.
Claim 15
Dependent Claim
23 words
A process according to claim 9 wherein a silica dispersion is utilized having an average primary particle size of 5 to 50 nm.
Claim 16
Dependent Claim
21 words
A process according to claim 9 wherein water and/or alcohol is used as the dispersant for the silica sol or dispersion.
Claim 17
Dependent Claim
22 words
A process according to claim 9 wherein inorganic fluorine compounds, particularly K 2 ZrF 6 are used for stabilizing the silica dispersion.
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) | 1993-06-11 | 1993-12-11 | 1994-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-06-11 | 1997-12-11 | 1998-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-06-11 | 2001-12-11 | 2002-06-12 | $7700.00 | Window Closed / Lapsed |