Patent US2457581A successfully refreshed from Google Patents.
Patent US4191587A successfully refreshed from Google Patents.
US4191587A
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Preparation of hydrophobic silicon dioxide
Assignee: Wacker Chemie AG
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Filing: 1978-11-30
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Granted: 1980-03-04
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Expires: 1998-11-30
Abstract
Abstract This invention relates to a process for preparing hydrophobic silicon dioxide which comprises treating silicon dioxide having a surface area of at least 50 m 2 /g with an organosilicon compound containing from 2 to 4 silicon atoms per molecule, in which at least 2 hydrocarbon radicals are bonded to each silicon atom, and any silicon valences which are not satisfied by hydrocarbon radicals are satisfied by siloxane oxygen atoms and at least one tin compound containing Sn-bonded halogen and/or organic radicals.
Inventors
- 👤 Gunter Kratel
- 👤 Gunter Stohr
- 👤 Hans Katzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:28
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/28; C09C1/30; C09C1/309; C09C3/00; C09C3/06; C09C3/08; C09C3/12; C01; C01P; C01P2006/00; C01P2006/12; C01P2006/90; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2993; Y10T428/2995
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
92 words
A process for the preparation of hydrophobic silicon dioxide which comprises treating silicon dioxide having a surface area of at least 50 m 2 /g with at least one organosilicon compound having from 2 to 4 silicon atoms per molecule, in which at least 2 hydrocarbon radicals are bonded to each silicon atom and the silicon valences which are not satisfied by hydrocarbon radicals are satisfied by siloxane oxygen atoms, and at least on tin compound having radicals selected from the group consisting of Sn-bonded halogen, Sn-bonded organic radicals and mixtures thereof.
Claim 2
Dependent Claim
92 words
A process for the preparation of hydrophobic silicon dioxide which comprises treating silicon dioxide having a surface area of at least 50 m 2 /g with at least one organosilicon compound having from 2 to 4 silicon atoms per molecule, in which at least 2 hydrocarbon radicals are bonded to each silicon atom and the silicon valences which are not satisfied by hydrocarbon radicals are satisfied by siloxane oxygen atoms, and at least on tin compound having radicals selected from the group consisting of Sn-bonded halogen, Sn-bonded organic radicals and mixtures thereof.
Claim 3
Dependent Claim
14 words
The process of claim 1, wherein the tin compound is free of Sn-bonded halogen.
References Cited (Backward Citations)
US3132961A
Cited
US3677784A
Cited
US4007050A
Cited
US3948676A
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US4068024A
Cited
US3931262A
Cited
US4005254A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-03-04 | 1983-09-03 | 1984-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-03-04 | 1987-09-03 | 1988-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-03-04 | 1991-09-03 | 1992-03-04 | $7700.00 | Window Closed / Lapsed |