US3965134A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for making silarylenesilanediol
Assignee: General Electric Co
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Filing: 1975-10-10
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Granted: 1976-06-22
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Expires: 1995-10-10
Abstract
Abstract A method is provided for making silarylenesilanediol. An aqueous mixture of a dialkoxy silarylene and a water miscible organic solvent, such as acetone, is refluxed. Water is combined with the resulting mixture to effect the separation of silarylenesilanediol which can be used to make polysilarylenesiloxanes.
Inventors
- 👤 Ronald W. LaRochelle
- 👤 Tyrone D. Mitchell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:23
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/48; C08G77/50; C08G77/52; C07; C07F; C07F7/00; C07F7/02; C07F7/08; C07F7/0834; C07F7/0836
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
101 words
In a method for making silarylenesilanediol comprising the steps of 1. refluxing a mixture consisting essentially of a dialkoxy silarylene, water and water miscible organic solvent and 2. stripping the mixture of volatiles under reduced pressure to a temperature of about 100°C to produce a product consistng essentially of silanol-terminated silarylene-siloxane, the improvement which comprises, combining the mixture of (1) with at least 2 parts of water per part of water miscible organic solvent used in the mixture, to effect the separation of silarylenesilanediol from the resulting mixture, whereby step (2) involving the stripping of the mixture of (1) is eliminated.
Claim 2
Dependent Claim
101 words
In a method for making silarylenesilanediol comprising the steps of 1. refluxing a mixture consisting essentially of a dialkoxy silarylene, water and water miscible organic solvent and 2. stripping the mixture of volatiles under reduced pressure to a temperature of about 100°C to produce a product consistng essentially of silanol-terminated silarylene-siloxane, the improvement which comprises, combining the mixture of (1) with at least 2 parts of water per part of water miscible organic solvent used in the mixture, to effect the separation of silarylenesilanediol from the resulting mixture, whereby step (2) involving the stripping of the mixture of (1) is eliminated.
Claim 3
Dependent Claim
12 words
A method in accordance with claim 1, where the dialkoxysilarylene is dialkoxysilphenylene.
Claim 4
Dependent Claim
12 words
A method in accordance with claim 1, where the dialkoxysilarylene is p-bis(dimethyl-n-propoxysilyl)benzene.
Claim 5
Dependent Claim
15 words
A method in accordance with claim 1, where the water miscible organic solvent is acetonitrile.
Claim 6
Dependent Claim
15 words
A method in accordance with claim 1, where the water miscible organic solvent is acetone.
References Cited (Backward Citations)
US3209018A
Cited
US3338870A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-06-22 | 1979-12-22 | 1980-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-22 | 1983-12-22 | 1984-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-22 | 1987-12-22 | 1988-06-22 | $7700.00 | Window Closed / Lapsed |