US3762978A
Expired / Lapsed
US
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Method for improving the adhesion between silicone elastomers
Assignee: Dow Silicones Corp
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Filing: 1971-07-15
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Granted: 1973-10-02
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Expires: 1991-07-15
Abstract
Abstract A cured silicone elastomer prepared from a composition containing silicon-bonded alkoxy radicals is contacted with a strong mineral acid, washed with water until free of acid, dried and thereafter a room temperature vulcanizable silicone elastomer composition is applied thereto and allowed to cure whereby an improved bond between the two silicone elastomers is realized.
Inventors
- 👤 G Holmes
- 👤 E Frisch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:53
CPC Classifications
C; C08; C08J; C08J7/00; C08J7/12; C08J7/14; C08J5/00; C08J5/12; C08J2383/00; C08J2383/04; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31652; Y10T428/31663
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
16 words
washing the cured silicone elastomer with water until the resulting wash water is free of acid,
Claim 2
Dependent Claim
58 words
The method in accordance with claim 1 in which after step (2) the washed cured silicone elastomer is rinsed with a volatile organic solvent to remove any remaining water on the surface thereof and thereafter the drying of step (3) is carried out by allowing the cured silicone elastomer to dry by exposure to air under ambient conditions.
Claim 3
Dependent Claim
41 words
The method in accordance with claim 2 in which the cured silicone elastomer of (1) comprises prior to curing a polydiorganosiloxane having hydroxyl endblocking groups and the uncured silicone elastomer composition of (4) also comprises a polydiorganosiloxane having hydroxyl endblocking groups.
Claim 4
Dependent Claim
14 words
drying the washed cured silicone elastomer at a temperature less than 50* C., thereafter,
Claim 5
Dependent Claim
135 words
applying an uncured silicone elastomer composition which cures at room temperature, said uncured silicone elastomer composition comprising polydiorganosiloxane as defined in (1) above wherein the endblocking groups are selected from the group consisting of hydroxyl groups, trialkoxysiloxy groups, monoorganodialkoxysiloxy groups, triacetoxysiloxy groups, monoorganodiacetoxysiloxy groups, triketoximesiloxy groups, and monoorganodiketoximesiloxy groups, where the alkoxy groups and the organic groups are defined in (1) and the ketoxime radical has a formula -O-N CR2 where R is selected from methyl radicals, ethyl radicals and phenyl radicals, from 0 to 15 parts by weight of a crosslinking agent per 100 parts by weight of the polydiorganosiloxane defined in (4), said crosslinking agent being selEcted from the group consisting of monoorganotrialkoxysilane, tetraalkoxysilane, partial hydrolyzates of the alkoxy silanes, monoorganotriacetoxysilane, and monoorganotriketoximesilane and mixtures thereof, and a curing catalyst for the composition,
Claim 6
Dependent Claim
29 words
The method in accordance with claim 1 in which the strong mineral acid is selected from the group consisting of hydrochloric acid, nitric acid, phosphoric acid and sulfuric acid.
Claim 7
Dependent Claim
29 words
The method in accordance with claim 3 in which the strong mineral acid is selected from the group consisting of hydrochloric acid, nitric acid, phosphoric acid and sulfuric acid.
Claim 8
Dependent Claim
22 words
allowing the uncured silicone elastomer composition to cure whereby an improved adhesive bond to the cured silicone elastomer of (1) is obtained.
Claim 9
Dependent Claim
25 words
The method in accordance with claim 4 in which the strong mineral acid is sulfuric acid having no more than 10 weight percent water present.
Claim 10
Dependent Claim
25 words
The method in accordance with claim 5 in which the strong mineral acid in sulfuric acid having no more than 10 weight percent water present.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-01 | 1977-04-02 | 1977-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-01 | 1981-04-02 | 1981-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-01 | 1985-04-02 | 1985-10-02 | $7700.00 | Window Closed / Lapsed |