Patent US4401498A successfully refreshed from Google Patents.
US4401498A
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US
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Process for producing reciprocal adhesion at the interface between two contacting layers with aluminum hydroxide being included in one of said layers
Assignee: A KETTENBACH FABRIK CHEMISCHER ERZEUNGNISSE DENTAL-SPEZIALIATEN & Co KG GmbH
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Filing: 1981-02-19
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Granted: 1983-08-30
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Expires: 2001-02-19
Abstract
Abstract The invention relates to a process for producing reciprocal adhesion at the interface between two contacting layers of condensation crosslinking and addition crosslinking polysiloxanes, aluminum hydroxide being added to one or both polysiloxane layers prior to crosslinking, so that a firmly adhering joint is obtained.
Inventors
- 👤 Ulrich W. K. Jahn
- 👤 Bernd H. Holzapfel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 02:21
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/18; C08K3/20; C08K3/22; A; A61; A61K; A61K6/00; A61K6/90
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
54 words
In a process for producing reciprocal adhesion at the interface between two contacting layers, whereof one layer is formed from condensation crosslinking polysiloxane and the other of said layers is formed from an addition cross-linking polysiloxane, the improvement which comprises adding aluminum hydroxide to at least one of the polysiloxane layers prior to crosslinking.
Claim 2
Dependent Claim
54 words
In a process for producing reciprocal adhesion at the interface between two contacting layers, whereof one layer is formed from condensation crosslinking polysiloxane and the other of said layers is formed from an addition cross-linking polysiloxane, the improvement which comprises adding aluminum hydroxide to at least one of the polysiloxane layers prior to crosslinking.
Claim 3
Dependent Claim
25 words
A process according to claim 1, wherein aluminium hydroxide obtained by the wet method by precipitation and dried at temperatures over 80° C. is used.
Claim 4
Dependent Claim
15 words
A process according to claim 1, wherein said crosslinking polysiloxanes form elastomers at ambient temperature.
Claim 5
Dependent Claim
22 words
A process according to claim 1, wherein one of the two layers is elastic or inelastic and the second layer is elastic.
Claim 6
Dependent Claim
56 words
A process according to claim 1, wherein the polysiloxane layer addition crosslinking at ambient temperature is produced in a known manner by a precious metal-catalysed method reaction between vinyl organic polysiloxanes with at least two vinyl groups in the molecule and organohydrogen siloxanes with at least two hydrogen atoms in the molecule connected to silicon atoms.
Claim 7
Dependent Claim
27 words
A process according to claim 1, wherein adhesion between the two layers is brought about (a) in a simultaneous crosslinking process or (b) in time-succeeding crosslinking processes.
Claim 8
Dependent Claim
40 words
A process according to claim 1, wherein the polysiloxane layer condensation crosslinking at ambient temperature is produced in per se known manner by the condensation of chain-like alpha-omega-dihydroxypolydiorganosiloxanes, with organic silicates, accompanied by the catalytic concomitant action of organo-tin compounds.
Claim 9
Dependent Claim
19 words
The process of claim 7 wherein the diorganosiloxane is polydimethylsiloxanol and the silicate is polyurethane silicate or tetraethyl silicate.
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) | 1986-08-29 | 1987-02-28 | 1987-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-29 | 1991-02-28 | 1991-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-29 | 1995-02-28 | 1995-08-30 | $7700.00 | Window Closed / Lapsed |