US5241097A
Expired / Lapsed
US
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Process for the preparation of cyclic siloxane
Assignee: Honeywell International Inc
•
Filing: 1992-12-21
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Granted: 1993-08-31
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Expires: 2012-12-21
Abstract
Abstract This invention relates to an improved, high-yield process for producing cyclic siloxane in a biphasic reaction solvent mixture comprising an alkane, an alcohol and water.
Inventors
- 👤 Joseph J. Zupancic
- 👤 Jeffrey P. Conrad
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:50
CPC Classifications
C; C07; C07F; C07F7/00; C07F7/02; C07F7/08; C07F7/0834; C07F7/0838; C07F7/0872; C07F7/0874; C07F7/0896; C07F7/21; C08; C08G; C08G77/00; C08G77/04; C08G77/045
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
73 words
An improved, high-yield process for producing cyclic siloxanes comprising the steps of gradually mixing a functional alkylsilane to a well-blended biphasic reaction solvent mixture comprising, based on the total volume of the solvent mixture, from about 40% to about 75% of an alkane, from about 15% to about 50% of an alcohol and from about 2% to about 10% of water at a temperature of between about 0° C. to about 30° C.
Claim 2
Dependent Claim
73 words
An improved, high-yield process for producing cyclic siloxanes comprising the steps of gradually mixing a functional alkylsilane to a well-blended biphasic reaction solvent mixture comprising, based on the total volume of the solvent mixture, from about 40% to about 75% of an alkane, from about 15% to about 50% of an alcohol and from about 2% to about 10% of water at a temperature of between about 0° C. to about 30° C.
Claim 3
Dependent Claim
66 words
The process for producing cyclic siloxanes according to claim 1, wherein said functional alkylsilane has the following formula: ##STR3## wherein R is an alkyl group containing from 1 to 5 carbon atoms, R', is hydrogen, a lower alkyl group containing from 1 to 5 carbon atoms or an alkenyl radical, and X and X' are independently selected from the group consisting of halogens and alkoxy units.
Claim 4
Dependent Claim
25 words
The process for producing cyclic siloxanes according to claim 1, wherein said alkane is an aliphatic alkane having about 5 to about 20 carbon atoms.
Claim 5
Dependent Claim
29 words
The process for producing cyclic siloxanes according to claim 1, wherein said alkane is selected from the group consisting of pentane, hexane, heptane, octane, nonane, decane, undecane and dodecane.
Claim 6
Dependent Claim
24 words
The process for producing cyclic siloxanes according to claim 1, wherein said alkane is selected from the group consisting of pentane, hexane and heptane.
Claim 7
Dependent Claim
24 words
The process for producing cyclic siloxanes according to claim 1, wherein said alcohol is an alcohol having about 1 to about 20 carbon atoms.
Claim 8
Dependent Claim
32 words
The process for producing cyclic siloxanes according to claim 1, wherein said alcohol is selected from the group consisting of methanol, ethanol, n-propanol, isopropanol, n-butanol, sec-butanol, tert-butanol, n-pentanol, tert-pentanol, neopentanol and n-hexanol.
Claim 9
Dependent Claim
28 words
The process for producing cyclic siloxanes according to claim 1, wherein said alcohol is selected from the group consisting of methanol, ethanol, n-propanol, isopropanol, n-butanol and tert butanol.
Claim 10
Dependent Claim
25 words
The process for producing cyclic siloxanes according to claim 1, wherein said reaction solvent mixture comprises from about 60% to about 70% of an alkane.
Claim 11
Dependent Claim
25 words
The process for producing cyclic siloxanes according to claim 1, wherein said reaction solvent mixture comprises from about 25% to about 35% of an alcohol.
Claim 12
Dependent Claim
24 words
The process for producing cyclic siloxanes according to claim 1, wherein said reaction solvent mixture comprises from about 5% to about 8% of water.
Claim 13
Dependent Claim
27 words
The process for producing cyclic siloxanes according to claim 1, wherein said process is conducted at a temperature of between about 10° C. and about 25° C.
Claim 14
Dependent Claim
15 words
The process for producing cyclic siloxanes according to claim 2, wherein R is methyl group.
Claim 15
Dependent Claim
14 words
The process for producing cyclic siloxanes according to claim 2, wherein R' is hydrogen.
Claim 16
Dependent Claim
26 words
The process for producing cyclic siloxanes according to claim 2, wherein X and X' are independently selected from the group consisting of chlorine, bromine and iodine.
Claim 17
Dependent Claim
26 words
The process for producing cyclic siloxanes according to claim 2, wherein X and X' are independently selected from the group consisting of methoxy and ethoxy units.
Claim 18
Dependent Claim
16 words
The process for producing cyclic siloxanes according to claim 2, wherein X and X' are chlorines.
Claim 19
Dependent Claim
16 words
The process for producing cyclic siloxanes according to claim 1, wherein said functional alkylsilane is dichloromethylsilane.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-08-30 | 1997-03-01 | 1997-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-08-30 | 2001-03-01 | 2001-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-08-30 | 2005-03-01 | 2005-08-31 | $7700.00 | Window Closed / Lapsed |