US3873337A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the hydrophobization of higher dispersed oxides
Assignee: DEUTSCHE GOLD-UND SILBER-SCHEIDENSTAFT VORMALS ROESSLER
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Filing: 1973-08-07
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Granted: 1975-03-25
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Expires: 1993-08-07
Abstract
Abstract Highly dispersed oxides of metals and/or silicon are hydrophobized by treatment with volatilizable organosilicon compounds in the gas phase. The oxide particles either come fresh from the production plant or are previously absolutely dried, and activated i.e., freed of physically and chemically bound water, in a fluidized bed with a dry inert gas stream at a temperature of 550* to 1000*C., preferably 600* to 950*C. under normal pressure in a few seconds to a few minutes, preferably in a time of 1 to 60 seconds. The oxide particles are reacted with a stoichiometrical mixture of at least one dialkyldichlorosilane and water in the ratio of 1:1 at a temperature of 350*C. to 650*C. in an atmosphere of CO2. There can also be used diaryldichlorosilanes.
Inventors
- 👤 Siegmar Laufer
- 👤 Waldemar Roy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:22
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/28; C09C1/30; C09C1/309; C01; C01B; C01B13/00; C01B13/14; C01B13/145; C09C3/00; C09C3/006; C09C3/04; C09C3/043; C09C3/12; C01P; C01P2004/00; C01P2004/80; C01P2004/82; C01P2004/84
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
97 words
A PROCESS OF HYDROPHOBIZATION OF HIGHLY DISPERSED MATERIAL WHICH IS AN OXIDE, MIXED OXIDE OR OXIDE MIXTURE OF AN ELEMENT SELECTED FROM THE GROUP CONSISTING OF ZIRCONIUM, TITANIUM, ALUMINUM, VANADIUM, IRON AND SILICON COMPRISING SUBJECTING PARTICLES OF THE DRY OXIDE, MIXED OXIDE OR OXIDE MIXTURE FREED FROM BOUND WATER TO A GASEOUS MIXTURE OF AN ORGANOHOLOSILANE OF THE FORMULA R-SI(-R'')(-X)2 AND STEAM IN THE MOLAR RATIO OF 1:1 AT A TEMPERATURE OF 350*C. TO 650*C. IN A CO2 ATMOSPHERE WHERIN R AND R'' ARE ALKYL OF 1 OT 4 CARBON ATOMS AND ARYL AND X IS HALOGEN.
Claim 2
Dependent Claim
97 words
A PROCESS OF HYDROPHOBIZATION OF HIGHLY DISPERSED MATERIAL WHICH IS AN OXIDE, MIXED OXIDE OR OXIDE MIXTURE OF AN ELEMENT SELECTED FROM THE GROUP CONSISTING OF ZIRCONIUM, TITANIUM, ALUMINUM, VANADIUM, IRON AND SILICON COMPRISING SUBJECTING PARTICLES OF THE DRY OXIDE, MIXED OXIDE OR OXIDE MIXTURE FREED FROM BOUND WATER TO A GASEOUS MIXTURE OF AN ORGANOHOLOSILANE OF THE FORMULA R-SI(-R'')(-X)2 AND STEAM IN THE MOLAR RATIO OF 1:1 AT A TEMPERATURE OF 350*C. TO 650*C. IN A CO2 ATMOSPHERE WHERIN R AND R'' ARE ALKYL OF 1 OT 4 CARBON ATOMS AND ARYL AND X IS HALOGEN.
Claim 3
Dependent Claim
10 words
A process according to claim 1 wherein X is chlorine.
Claim 4
Dependent Claim
50 words
A process according to claim 1 wherein the subjected particles come from stored material which has then been treated in a fluidized bed with dry inert gas steam at temperatures in the range from 550*C. to 1000*C. under normal pressure from a time of 1 second to a few minutes.
Claim 5
Dependent Claim
20 words
A process according to claim 1 wherein there is sufficient CO2 to provide a pH of 3.5 in the product.
Claim 6
Dependent Claim
12 words
A process according to claim 4 wherein the organohalosilane is dimethyl dichlorosilane.
Claim 7
Dependent Claim
16 words
A process according to claim 4 wherein the oxide particles after the hydrophobization are completely deacidified.
Claim 8
Dependent Claim
20 words
A process according to claim 6 wherein the deacidification is carried out in the gaseous phase in a CO2 atmosphere.
Claim 9
Dependent Claim
15 words
A process according to claim 1 wherein the highly dispersed material is pyrogenically prepared silica.
Claim 10
Dependent Claim
14 words
A process according to claim 1 wherein the highly dispersed material is precipitated silica.
Claim 11
Dependent Claim
16 words
A process according to claim 1 wherein the highly dispersed material is finely divided aluminum oxide.
Claim 12
Dependent Claim
30 words
A process according to claim 1 wherein the highly dispersed material is a mixed oxide consisting of Al2O3 and SiO2 as an oxide mixture or a mixture of the oxides.
Claim 13
Dependent Claim
17 words
A process according to claim 1 wherein the hydrophobization is carried out in swirl- or fluidized bed.
Claim 14
Dependent Claim
22 words
A process according to claim 7 wherein the deacidification is carried out in a swirl- or fluidized bed in a counter-current process.
References Cited (Backward Citations)
US2802850A
Cited
US2993809A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-24 | 1978-09-23 | 1979-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-24 | 1982-09-23 | 1983-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-24 | 1986-09-23 | 1987-03-25 | $7700.00 | Window Closed / Lapsed |