US4221691A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of hydrolyzing chlorosilanes
Assignee: Dow Silicones Corp
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Filing: 1979-02-16
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Granted: 1980-09-09
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Expires: 1999-02-16
Abstract
Abstract A method of hydrolyzing polyfunctional chlorosilicon compositions is described which produces more uniform, non-sticky gels which are more easily handleable. The method involves adding 1 to 25 weight percent of a hydrocarbon oil to the chlorosilicon composition prior to the hydrolysis in an aqueous medium.
Inventors
- 👤 Jack B. Danielson
- 👤 Donald N. Ingebrigtson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:51
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/04; C08G77/06
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
80 words
A method of hydrolyzing a polyfunctional chlorosilicon composition comprising (a) forming a solution of 1 to 25 percent by weight of a hydrocarbon oil with a viscosity of at least 2 centistokes at 25° C. and 75 to 99 percent by weight of polyfunctional chlorosilicon composition (b) mixing the solution with an aqueous medium and (c) removing the hydrogen chloride and aqueous medium to obtain a nonsticky gel that is easily handleable in further processing steps, shipment or disposal operations.
Claim 2
Independent Claim
80 words
A method of hydrolyzing a polyfunctional chlorosilicon composition comprising (a) forming a solution of 1 to 25 percent by weight of a hydrocarbon oil with a viscosity of at least 2 centistokes at 25° C. and 75 to 99 percent by weight of polyfunctional chlorosilicon composition (b) mixing the solution with an aqueous medium and (c) removing the hydrogen chloride and aqueous medium to obtain a nonsticky gel that is easily handleable in further processing steps, shipment or disposal operations.
Claim 3
Dependent Claim
33 words
The method of hydrolyzing polyfunctional chlorosilicon composition of claim 1 wherein the aqueous medium is selected from the group consisting of water, an aqueous calcium chloride solution and a concentrated hydrogen chloride solution.
Claim 4
Dependent Claim
25 words
The method of hydrolyzing a polyfunctional chlorosilicon composition of claim 1 wherein the solution contains 2 to 10 percent by weight of the hydrocarbon oil.
Claim 5
Dependent Claim
26 words
The method of hydrolyzing a polyfunctional chlorosilicon composition of claim 1 wherein the hydrocarbon oil has a viscosity of at least 40 centistokes at 25° C.
Claim 6
Dependent Claim
26 words
The method of hydrolyzing a polyfunctional chlorosilicon composition of claim 1 wherein the polyfunctional chlorosilicon composition is a by-product from the production of commercial organochlorosilane monomers.
Claim 7
Dependent Claim
23 words
The method of hydrolyzing a polyfunctional chlorosilicon composition of claim 5 wherein the by-product is obtained from the direct process production of methylchlorosilanes.
Claim 8
Dependent Claim
27 words
The method of hydrolyzing a polyfunctional chlorosilicon composition of claim 5 wherein the aqueous medium is a concentrated hydrogen chloride solution and hydrogen chloride gas is recovered.
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) | 1983-09-09 | 1984-03-10 | 1984-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-09 | 1988-03-10 | 1988-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-09 | 1992-03-10 | 1992-09-09 | $7700.00 | Window Closed / Lapsed |