US3920865A
Expired / Lapsed
US
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Process of hydrophorizing highly dispersed metal or metalloid oxides
Assignee: Evonik Operations GmbH
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Filing: 1972-04-06
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Granted: 1975-11-18
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Expires: 1992-04-06
Abstract
Abstract Highly dispersed metal or metalloid oxides are rendered hydrophobic by I. contacting such oxide particles while in the form of an aerogel with a dry inert gas stream in a fluidizing bed at a temperature from 600 to 1000* C and atmospheric pressure for a period of less than 60 seconds to render the particles absolutely dry and thus to activate them; II. charging the resultant dried and activated particles in a fluidizing bed with at least one gas-phase organosilicon compound selected from the group consisting (a) of linear organopolysiloxanes (b) cyclic organopolysiloxanes (c) a mixture of both types of siloxanes and (d) a mixture of any of the compounds at (a)-(c) with an organohalogenosilane at a temperature in the range from 25* to 650* C; III. causing said charged oxide to react with the organosilicon compounds noted at (II) at a temperature from 35* to 650* C; and IV. finally treating the reaction product with an inert gas stream in a fluidizing bed at temperatures from 500* to 125* C.
Inventors
- 👤 Siegmar Laufer
- 👤 Waldemar Roy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:32
CPC Classifications
C; C09; C09C; C09C3/00; C09C3/12; C01; C01B; C01B13/00; C01B13/14; C01B13/145; C01B33/00; C01B33/113; C08; C08K; C08K9/00; C08K9/04; C08K9/06; C08K9/08; C09C1/00; C09C1/28; C09C1/30; C09C1/3081; C09C1/40; C09C1/405; C09C3/006; C09C3/04; C09C3/043; C01P; C01P2004/00; C01P2004/80; C01P2004/82; C01P2006/00; C01P2006/12; C01P2006/80; C01P2006/90; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2993; Y10T428/2995
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
148 words
A PROCESS FOR MAKING OXIDES OF METALS OR METALLOIDS HYDROPHOBIC, PARTICULARLY OXIDES FORMED PYROGENICALLY, COMPRISING THE STEPS OF: I. CONTACTING OXIDE PARTICLES WITH A SUBSTANTIALLY DRY INERT GAS STREAM SO AS TO DRY THE PARTICLES AND THUS ACTIVATE THEN, SAID CONTACTING BEING CARRIED OUT AT TEMPERATURES BETEEN SUBSTANTIALLY 600* AND 100*C, II. CHARGING THE DRIED AND ACTIVATED PARTICLES WITH AT LEAST ONE GAS-PHASE ORGANOSILICON COMPOUND SELECTED FROM THE GROUP CONSISTING OF (A) LINEAR ORGGANOSILICON COMPOUND SELECTED CYCLIC ORGANOPOLYSILOXANES (C) A MIXTURE OF (A) AND (B) SILOXANES AND (D) A MIXTURE OF AT LEAST ONE OF SAID ORGANOPOLYSILOXANES WITH AN ORGANOHALOGENSILANE, SAID CHARGING BEING CARRIED OUT AT TEMPERATURES BETWEEN SUBSTANTIALLY 25* AND 650*C, III. CAUSING THE DRIED PARTICLES TO REACT WITH THE ORGANOSILICON COMPOUNDS OR MIXTURE AND TEMPERATURES BETWEEN SUBSTANTIALLY 350*C, AND IV. TREATING THE REACTION PRODUCT WITH AN INERT GAS STREAM AT TEMPERATURE BETWEEN SUBSTANTIALLY 125* AND 500*C
Claim 2
Dependent Claim
148 words
A PROCESS FOR MAKING OXIDES OF METALS OR METALLOIDS HYDROPHOBIC, PARTICULARLY OXIDES FORMED PYROGENICALLY, COMPRISING THE STEPS OF: I. CONTACTING OXIDE PARTICLES WITH A SUBSTANTIALLY DRY INERT GAS STREAM SO AS TO DRY THE PARTICLES AND THUS ACTIVATE THEN, SAID CONTACTING BEING CARRIED OUT AT TEMPERATURES BETEEN SUBSTANTIALLY 600* AND 100*C, II. CHARGING THE DRIED AND ACTIVATED PARTICLES WITH AT LEAST ONE GAS-PHASE ORGANOSILICON COMPOUND SELECTED FROM THE GROUP CONSISTING OF (A) LINEAR ORGGANOSILICON COMPOUND SELECTED CYCLIC ORGANOPOLYSILOXANES (C) A MIXTURE OF (A) AND (B) SILOXANES AND (D) A MIXTURE OF AT LEAST ONE OF SAID ORGANOPOLYSILOXANES WITH AN ORGANOHALOGENSILANE, SAID CHARGING BEING CARRIED OUT AT TEMPERATURES BETWEEN SUBSTANTIALLY 25* AND 650*C, III. CAUSING THE DRIED PARTICLES TO REACT WITH THE ORGANOSILICON COMPOUNDS OR MIXTURE AND TEMPERATURES BETWEEN SUBSTANTIALLY 350*C, AND IV. TREATING THE REACTION PRODUCT WITH AN INERT GAS STREAM AT TEMPERATURE BETWEEN SUBSTANTIALLY 125* AND 500*C
Claim 3
Dependent Claim
18 words
The process of claim 1 which comprises carrying out step (I) at a temperature of 900* to 950*C.
Claim 4
Dependent Claim
11 words
The process of claim 1 wherein said inert gas is nitrogen.
Claim 5
Dependent Claim
12 words
The process of claim 1 wherein said inert gas is carbon dioxide.
Claim 6
Dependent Claim
13 words
The process of claim 1, which comprises carrying out step (I) using air.
Claim 7
Dependent Claim
22 words
The process of claim 1, which comprises carrying out step (I) using a mixture of equal volumes of superheated steam and air.
Claim 8
Dependent Claim
23 words
The process of claim 1, which comprises carrying out step (I) using a mixture of eQual volumes of superheated steam and carbon dioxide.
Claim 9
Dependent Claim
18 words
The process of claim 1 which comprises carrying out step (IV) with an inert gas stream of nitrogen.
Claim 10
Dependent Claim
27 words
The process of claim 1 wherein said organosilicon compound is a linear organopolysiloxane and step (II) is carried out at a temperature from 25* to 350* C.
Claim 11
Dependent Claim
26 words
The process of claim 1 wherein said organosilicon compound is a cyclic organopolysiloxane and step (II) is carried out at a temperature from 25* to 350*C.
Claim 12
Dependent Claim
20 words
The process of claim 1 which comprises additionally introducing a gas phase organosilicon compound of said group into step (III).
Claim 13
Dependent Claim
16 words
The process of claim 11 wherein different organosilicon compounds are introduced in steps (II) and (III).
Claim 14
Dependent Claim
21 words
The process of claim 11 wherein the same organosilicon compound or compounds are introduced in each of steps (II) and (III).
Claim 15
Dependent Claim
18 words
The process of claim 1 wherein the oxide particles obtained in step (I) are subjected to UV irradiation.
Claim 16
Dependent Claim
24 words
The process of claim 1 wherein steps (I), (II), (III) and (IV) are carried out in a total time of less than 2 minutes.
Claim 17
Dependent Claim
15 words
The process of claim 1 wherein said organopolysiloxane is hexamethyldisiloxane, hexamethylcyclotrisiloxane, octamethylcyclotetrasiloxane, octamethyltrisiloxane or decamethyltetrasiloxane.
Claim 18
Dependent Claim
18 words
The process of claim 1 wherein said organohalogenosilane is an alkyl, aryl or alkylaryl mono-, di- or trichlorosilane.
Claim 19
Dependent Claim
11 words
The process of claim 1 wherein said oxide particles comprise SiO2.
Claim 20
Dependent Claim
17 words
The process of claim 1 wherein said oxide particles comprise SiO2 and said organosilicon compound comprises octamethylcyclotetrasiloxane.
Claim 21
Dependent Claim
20 words
The process of claim 1 wherein said oxide particles comprise a mixed SiO2/Al2O3 oxide and said organosilicon compound comprises octamethylcyclotetrasiloxane.
Claim 22
Dependent Claim
17 words
The process of claim 1 which comprises carrying out steps (I), (II) and (IV) in fluidized beds.
Claim 23
Dependent Claim
11 words
The process of claim 21 using the same the different steps.
Claim 24
Dependent Claim
28 words
The process of claim 21 using a fluidizing gas for one of said steps which is different from the fluidizing gas used for at least one other step.
Claim 25
Dependent Claim
16 words
The process of claim 1 wherein the oxide particles are in the form of an aerogel.
Claim 26
Dependent Claim
14 words
The process of claim 1 which comprises carrying out step (I) at atmospheric pressure.
Claim 27
Dependent Claim
20 words
The process of claim 1 which comprises carrying out step (I) for a period of less than substantially 60 seconds.
Claim 28
Dependent Claim
17 words
The process of claim 1 which comprises carrying out step (IV) with a substantially dry gas stream.
References Cited (Backward Citations)
US2438366A
Cited
US2470593A
Cited
US2870109A
Cited
US2803617A
Cited
US3085905A
Cited
US3128196A
Cited
US3122516A
Cited
US3687718A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-17 | 1979-05-19 | 1979-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-17 | 1983-05-19 | 1983-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-17 | 1987-05-19 | 1987-11-18 | $7700.00 | Window Closed / Lapsed |