Patent US4289889A successfully refreshed from Google Patents.
US4289889A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of tetraalkoxysilanes
Assignee: OSI Specialties Inc
•
Filing: 1980-06-30
•
Granted: 1981-09-15
•
Expires: 2000-06-30
Abstract
Abstract Process for the preparation of tetraalkylorthosilicates which comprises contacting alkanol and dimethylamine with copper-activated silicon, followed by adding alkanol to the resultant silane mixture.
Inventors
- 👤 William B. Herdle
- 👤 Bernard Kanner
- 👤 Donald L. Bailey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 18:46
CPC Classifications
C; C07; C07F; C07F7/00; C07F7/02; C07F7/025; C07F7/04
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
100 words
A process for the preparation of a tetraalkylorthosilicate with comprises (I) contacting at a temperature in the range of 200° C. through 350° C. for a period of time sufficient to form a silane mixture (A) an alkanol ROH wherein R is an alkyl group of from one to three carbon atoms and (B) dimethylamine with (C) copper-activated silicon, wherein the mole ration of dimethylamine (B) to alkanol (A) is in the range of from 0.2:1 to 10:1, and (II) subsequently adding to said silane mixture at least enough alkanol ROH to convert all of the silanes present to tetraalkylorthosilicates.
Claim 2
Dependent Claim
100 words
A process for the preparation of a tetraalkylorthosilicate with comprises (I) contacting at a temperature in the range of 200° C. through 350° C. for a period of time sufficient to form a silane mixture (A) an alkanol ROH wherein R is an alkyl group of from one to three carbon atoms and (B) dimethylamine with (C) copper-activated silicon, wherein the mole ration of dimethylamine (B) to alkanol (A) is in the range of from 0.2:1 to 10:1, and (II) subsequently adding to said silane mixture at least enough alkanol ROH to convert all of the silanes present to tetraalkylorthosilicates.
Claim 3
Dependent Claim
19 words
A process as in claim 1 wherein the mole ratio of dimethylamine to alkanol is from 0.8:1 to 5:1.
Claim 4
Dependent Claim
19 words
A process as in claim 2 wherein the mole ratio of dimethylamine to alkanol is from 1:1 to 3:1.
Claim 5
Dependent Claim
44 words
A process as in claim 3 in which the alkanol and dimethylamine are contacted with copper-activated silicon at a temperature in the range of 240° C. through 290° C. and in which excess alkanol is added to the resultant silane mixture at ambient temperature.
Claim 6
Dependent Claim
20 words
A process as in any one of the claims 1, 2, 3, or 4 in which the alkanol is ethanol.
References Cited (Backward Citations)
US2473260A
Cited
US2927937A
Cited
US3072700A
Cited
US3505379A
Cited
US3557179A
Cited
US3709801A
Cited
US3641077A
Cited
US3803197A
Cited
US3775457A
Cited
US4113761A
Cited
US4088669A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-09-14 | 1985-03-16 | 1985-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-14 | 1989-03-16 | 1989-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-14 | 1993-03-16 | 1993-09-15 | $7700.00 | Window Closed / Lapsed |