US4827008A
Expired / Lapsed
US
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Preparation of alkoxysilanes containing a low level of chlorine compounds
Assignee: BASF SE
•
Filing: 1988-03-08
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Granted: 1989-05-02
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Expires: 2008-03-08
Abstract
Abstract Alkoxysilanes containing low levels of chlorine compounds are prepared by stepwise etherification of chlorosilanes with alcohols in liquid phase and removal of the resulting hydrogen chloride by reacting the alkoxysilane obtained, which still contains a small amount of chlorine compound, with a metal alkoxide in an amount which corresponds to a small stoichiometric excess based on the proportion of chlorine compound, and freeing the reaction product from the resulting salt.
Inventors
- 👤 Charalampos Gousetis
- 👤 Knut Oppenlaender
- 👤 Gert Liebold
- 👤 Guenter Frey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 20:45
CPC Classifications
C; C07; C07F; C07F7/00; C07F7/02; C07F7/08; C07F7/20; C07F7/18; C07F7/1804; C07F7/1872; C07F7/188
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
82 words
A process for preparing an alkoxysilane containing from about 0.001 to 0.02% by weight of organic chlorine compound by stepwise etherification of a chlorosilane with an alcohol in liquid phase and removal of the resulting hydrogen chloride, which comprises reacting the alkoxysilane obtained, which still contains a small amount of chlorine compound, with a metal alkoxide in an amount which corresponds to a small stoichiometric excess based on the proportion of chlorine compound, and freeing the reaction product from the resulting salt.
Claim 2
Dependent Claim
82 words
A process for preparing an alkoxysilane containing from about 0.001 to 0.02% by weight of organic chlorine compound by stepwise etherification of a chlorosilane with an alcohol in liquid phase and removal of the resulting hydrogen chloride, which comprises reacting the alkoxysilane obtained, which still contains a small amount of chlorine compound, with a metal alkoxide in an amount which corresponds to a small stoichiometric excess based on the proportion of chlorine compound, and freeing the reaction product from the resulting salt.
Claim 3
Dependent Claim
128 words
A process as defined in claim 1, for preparing an alkoxysilane of the formula I ##STR7## where R 1 , R 2 and R 3 are each aliphatic, araliphatic or aromatic radicals of 1 to 20 carbons atoms or OR 4 , R 1 can also be hydrogen, and OR 4 is the radical of a monohydric alcohol of 1 to 20 carbon atoms, by reacting a chlorosilane of the formula II ##STR8## with an alkanol of the formula III HO-R.sup.4 III where R 1 , R 2 , R 3 and R 4 each have the abovementioned meanings, R 1 , R 2 and R 3 can each further be chlorine and R 1 can also be hydrogen, and treating the reaction product with a metal alkoxide.
Claim 4
Dependent Claim
47 words
A process as defined in claim 2, wherein the alcohol HO--R 4 is a polyglycol monoether of the formula IV ##STR9## where R 5 is hydrogen or methyl, R 6 is alkyl of 1 to 8 carbon atoms and m is an integer from 1 to 4.
Claim 5
Dependent Claim
84 words
A process as defined in claim 1, for preparing an alkoxysilane of the formula V ##STR10## where R 1 and R 2 are each aLkyl of 1 to 20 carbon atoms, R 2 can also be OR 4 , and OR 4 is the radical of the formula ##STR11## VI. where R 5 is hydrogen or methyl, R 6 is alkyl of 1 to 8 carbon atoms, m is an integer from 1 to 4, and p is an integer from 1 to 10.
Claim 6
Dependent Claim
35 words
A process as defined in claim 1, wherein the metal alkoxide used is a sodium alkoxide of the formula VII ##STR12## where R 5 , R 6 and m are as defined in claim 4.
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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) | 1992-05-01 | 1992-10-31 | 1993-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-01 | 1996-10-31 | 1997-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-01 | 2000-10-31 | 2001-05-02 | $7700.00 | Window Closed / Lapsed |