Patent US4005116A successfully refreshed from Google Patents.
US4005116A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Organosilicon compounds
Assignee: Dow Silicones UK Ltd
•
Filing: 1975-11-06
•
Granted: 1977-01-25
•
Expires: 1995-11-06
Abstract
Abstract Disilazanes having sulphur atoms attached to the silicon atoms through divalent aliphatic hydrocarbon radicals having from 2 to 6 carbon atoms. They are prepared by reacting a disilazane having olefinically unsaturated hydrocarbon radicals attached to the silicon atoms with a thiol, in the presence of a free radical generator. The disilazanes are useful as intermediates and for the treatment of particulate solids.
Inventors
- 👤 Brian John Griffiths
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:14
CPC Classifications
C; C07; C07F; C07F7/00; C07F7/02; C07F7/08; C07F7/10
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
72 words
Disilazanes having the general formula HN(R.sub.2 SiR'SR").sub.2 wherein each R represents a monovalent radical having from 1 to 8 carbon atoms and free of aliphatic unsaturation which is a hydrocarbon radical, halogenated hydrocarbon radical or hydrocarbonoxy radical, R' represents a divalent aliphatic hydrocarbon radical having from 2 to 6 inclusive carbon atoms and R" represents a monovalent hydrocarbon radical free of aliphatic unsaturation and having from 1 to 8 inclusive carbon atoms.
Claim 2
Dependent Claim
72 words
Disilazanes having the general formula HN(R.sub.2 SiR'SR").sub.2 wherein each R represents a monovalent radical having from 1 to 8 carbon atoms and free of aliphatic unsaturation which is a hydrocarbon radical, halogenated hydrocarbon radical or hydrocarbonoxy radical, R' represents a divalent aliphatic hydrocarbon radical having from 2 to 6 inclusive carbon atoms and R" represents a monovalent hydrocarbon radical free of aliphatic unsaturation and having from 1 to 8 inclusive carbon atoms.
Claim 3
Dependent Claim
17 words
Disilazanes as claimed in claim 1 wherein each R is a methyl radical or a phenyl radical.
Claim 4
Dependent Claim
16 words
Disilazanes as claimed in claim 1 wherein R' has from 2 to 4 inclusive carbon atoms.
Claim 5
Dependent Claim
70 words
A process for the preparation of a disilazane which comprises reacting in the presence of a free radical initiator (a) a disilazane having the general formula HN(R 2 SiR"') 2 in which R is as defined in claim 1 and R"' represents a monovalent hydrocarbon radical having from 2 to 6 carbon atoms and containing olefinic unsaturation, and (b) a thiol R"SH wherein R" is as defined in claim 1.
Claim 6
Dependent Claim
13 words
A process as claimed in claim 4 wherein R"' represents the vinyl radical.
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) | 1980-01-25 | 1980-07-26 | 1981-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-25 | 1984-07-26 | 1985-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-25 | 1988-07-26 | 1989-01-25 | $7700.00 | Window Closed / Lapsed |