Patent US4007050A successfully refreshed from Google Patents.
US4007050A
Expired / Lapsed
US
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Hydrophobic oxides of metals and for metalloids
Assignee: Evonik Operations GmbH
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Filing: 1975-01-23
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Granted: 1977-02-08
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Expires: 1995-01-23
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 at atmospheric pressure for a period of less than 60 seconds to render the particles absolutely dry and thus 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 of (a) linear organopolysiloxanes (b) cyclic organopolysiloxanes (c) a mixture of both types of siloxanes and (d) a mixture of any of the substances (a)-(c) with an organohalogenosilane at a temperature in the range from 25° to 650° C; Iii. causing said charged particles to react with the organosilicon compounds 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
- 👤 Roy Waldemar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:42
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
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
84 words
An oxidic product having hydrophobic charcteristics, comprising oxide particles including SiO 2 particles having surfaces which are substantially free of silanol groups bound to each other by hydrogen bridges; and at least one organosilicon compound chemically bonded to said surfaces so as to impart hydrophobic properties to said particles, said compound being bonded to each of the respective surfaces at locations corresponding to those at which isolated silanol groups were present and with which said compound reacted chemically to become bonded to said surfaces.
Claim 2
Dependent Claim
84 words
An oxidic product having hydrophobic charcteristics, comprising oxide particles including SiO 2 particles having surfaces which are substantially free of silanol groups bound to each other by hydrogen bridges; and at least one organosilicon compound chemically bonded to said surfaces so as to impart hydrophobic properties to said particles, said compound being bonded to each of the respective surfaces at locations corresponding to those at which isolated silanol groups were present and with which said compound reacted chemically to become bonded to said surfaces.
Claim 3
Dependent Claim
15 words
A product as defined in claim 1, wherein said surfaces are substantially free of acid.
Claim 4
Dependent Claim
18 words
A product as defined in claim 1, wherein said oxide particles also comprise an oxide of a metal.
Claim 5
Dependent Claim
20 words
A product as defined in claim 1, wherein said oxide particles comprise SiO 2 and Al 2 O 3 .
Claim 6
Dependent Claim
13 words
A product as defined in claim 1, wherein said compound comprises an organopolysiloxane.
Claim 7
Dependent Claim
14 words
A product as defined in claim 5, wherein said compound comprises a linear ogranopolysiloxane.
Claim 8
Dependent Claim
14 words
A product as defined in claim 5, wherein said compound comprises a cyclic organopolysiloxane.
Claim 9
Dependent Claim
24 words
A product as defined in claim 1, wherein said compound comprises a member of the group consisting of hexamethyldisiloxane, hexamethylcyclotrisiloxane, octamethylcyclotetrasiloxane, octamethyltrisiloxane and decamethyltetrasiloxane.
Claim 10
Dependent Claim
13 words
A product as defined in claim 1, wherein said compound comprises an organohalogensilane.
Claim 11
Dependent Claim
13 words
A product as defined in claim 9, wherein said compound comprises an organo-chlorosilane.
Claim 12
Dependent Claim
37 words
A product as defined in claim 10, wherein said compound comprises a member of the group consisting of alkyl monochlorosilanes, alkyl dichlorosilanes, alkyl trichlorosilanes, aryl monochlorosilanes, aryl dichlorosilanes, aryl trichlorosilanes, alkyl-aryl monochlorosilanes, alkyl-aryl dichlorosilanes and alkyl-aryl trichlorosilane.
Claim 13
Dependent Claim
21 words
A product as defined in claim 1, wherein said compound comprises a member of the group consisting of siloxanes and silanes.
Claim 14
Dependent Claim
19 words
A product as defined in claim 12, wherein both a silane and a siloxane are bound to said surfaces.
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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) | 1980-02-08 | 1980-08-09 | 1981-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-02-08 | 1984-08-09 | 1985-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-02-08 | 1988-08-09 | 1989-02-08 | $7700.00 | Window Closed / Lapsed |