US3946059A
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US
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Method of preparing alkylalkoxysilanes containing polysulfide bridges
Assignee: Dynamit Nobel AG
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Filing: 1974-12-03
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Granted: 1976-03-23
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Expires: 1994-12-03
Abstract
Abstract A process for preparing an alkylalkoxysilane containing polysulfide bridges which silane has the formula: (RO).sub.3.sub.-m R.sub.m Si--Z--S.sub.2.sub.+x --Z--SiR.sub.m (OR) 3 -m , wherein R represents identical or different linear or branched alkyl radicals having 1 to 6 carbon atoms or phenyl, Z represents linear or branched alkylene radicals having 1 to 8 carbon atoms, m is 0 to 3 and x is 1 to 4, which comprises contacting a bis-alkyl-alkoxysilyldisulfide of the formula: (RO).sub.3.sub.-m R.sub.m Si--Z--S--S--Z--SiR.sub.m (OR).sub.3.sub.-m wherein R, Z and m have the previously assigned significance, with sulfur at a temperature between 100° and 200°C.
Inventors
- 👤 Paul Janssen
- 👤 Klaus-Dieter Steffen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:30
CPC Classifications
C; C07; C07F; C07F7/00; C07F7/02; C07F7/08; C07F7/18; C07F7/1804; C07F7/1872; C07F7/1892
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
95 words
A process for preparing an alkylalkoxysilane containing a polysulfide bridge having the formula: (RO).sub.3.sub.-m R.sub.m Si--Z--S.sub.2.sub.+x --Z--SiR.sub.m (OR).sub.3.sub.-m wherein each R represents an identical or different linear or branched alkyl radical having 1 to 6 carbon atoms or phenyl, Z represents a linear or branched alkylene radical having 1 to 8 carbon atoms, m is 0 to 3, x is 1 to 4, which comprises contacting a bis-alkyl-alkoxysilyl-disulfide of the formula: (RO).sub.3.sub.-m R.sub.m Si--Z--S--S--Z--SiR.sub.m (OR).sub.3.sub.-m wherein R, Z and m have the previously assigned significance, with the sulfur at a temperature between 100° and 200°C.
Claim 2
Dependent Claim
95 words
A process for preparing an alkylalkoxysilane containing a polysulfide bridge having the formula: (RO).sub.3.sub.-m R.sub.m Si--Z--S.sub.2.sub.+x --Z--SiR.sub.m (OR).sub.3.sub.-m wherein each R represents an identical or different linear or branched alkyl radical having 1 to 6 carbon atoms or phenyl, Z represents a linear or branched alkylene radical having 1 to 8 carbon atoms, m is 0 to 3, x is 1 to 4, which comprises contacting a bis-alkyl-alkoxysilyl-disulfide of the formula: (RO).sub.3.sub.-m R.sub.m Si--Z--S--S--Z--SiR.sub.m (OR).sub.3.sub.-m wherein R, Z and m have the previously assigned significance, with the sulfur at a temperature between 100° and 200°C.
Claim 3
Dependent Claim
25 words
A process according to claim 1 wherein the disulfide and sulfur are maintained in contact with one another at a temperature between 120° and 160°C.
Claim 4
Dependent Claim
10 words
A process according to claim 1 wherein R is ethyl.
Claim 5
Dependent Claim
10 words
A process according to claim 1 wherein Z is propylene.
Claim 6
Dependent Claim
10 words
A process according to claim 1 wherein m is 0.
Claim 7
Dependent Claim
21 words
A process according to claim 1 wherein the sulfur is present in at least a stoichiometric amount and x is 1.
Claim 8
Dependent Claim
20 words
A process according to claim 1 wherein x is 2 and sulfur is present in a stoichiometric amount. sulfuryl formula
Claim 9
Dependent Claim
19 words
A process according to claim 1 wherein x is 3 and the sulfur is present in a stoichiometric amount.
Claim 10
Dependent Claim
18 words
A process according to claim 1 wherein the process is carried out in the absence of a solvent.
Claim 11
Dependent Claim
86 words
A process according to claim 1 wherein the disulfide is formed by contacting a silylmercaptan with a sulfuryl chloride in a solvent in which sulfur is also soluble and at the termination of the reaction between the silylmercaptan and the sulfur chloride sulfur is added to the reaction mixture containing, as the result thereof, a disulfide of the formula: (RO).sub.3.sub.-m R.sub.m Si--Z--S--S--Z--SiR.sub.m (OR).sub.3.sub.-m wherein R, Z and m have the previously assigned significance and the reaction mixture is maintained at a temperature between 100° and 160°C.
References Cited (Backward Citations)
US3284466A
Cited
US3317461A
Cited
US3530160A
Cited
US3842111A
Cited
US3873489A
Cited
US3768537A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-03-23 | 1979-09-22 | 1980-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-23 | 1983-09-22 | 1984-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-23 | 1987-09-22 | 1988-03-23 | $7700.00 | Window Closed / Lapsed |