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(12) Patent: | (11) CA 2203726 |
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(54) English Title: | SILANIZED SILICA |
(54) French Title: | SILICE SILANISEE |
Status: | Expired |
(51) International Patent Classification (IPC): |
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(72) Inventors : |
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(73) Owners : |
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(71) Applicants : |
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(74) Agent: | MARKS & CLERK |
(74) Associate agent: | |
(45) Issued: | 2001-08-07 |
(22) Filed Date: | 1997-04-25 |
(41) Open to Public Inspection: | 1997-10-26 |
Examination requested: | 1997-10-17 |
Availability of licence: | N/A |
(25) Language of filing: | English |
Patent Cooperation Treaty (PCT): | No |
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(30) Application Priority Data: | ||||||
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The present invention provides a silanized pyrogenically- produced silica with the following physico-chemical properties: Specific surface area m2/g 80 - 400 Primary particle size nm 7 - 40 Tamped density g/l 50 - 300 pH value 3 - 10 Carbon content % 0.1 - 15 DBP number % < 200. The invention also provides a method of producing the above silanized pyrogenically-produced silica, comprising spraying pyrogenically-produced silica in a mixing container under intensive mixing, first with water or dilute acid and then with hexamethyldisilazane, mixing for 15 to 30 minutes, and tempering at a temperature of 100 to 400°C for a period of 1 to 6 h.
La présente invention fournit une silice produite par pyrogénation silanisée avec les propriétés physico-chimiques suivantes : une surface spécifique de 80 à 400 m/g, des particules primaires d'une taille de 7 à 40 nm, une densité tassée de 50 à 300 g/L, une valeur de pH de 3 à 10, une teneur en carbone de 0,1 à 15 %, un indice DBP d'un pourcentage inférieur à 200. L'invention fournit également une méthode de production de cette silice produite par pyrogénation silanisée, comprenant la pulvérisation de la silice produite par pyrogénation dans un récipient à mélange sous agitation intense, d'abord avec de l'eau ou de l'acide dilué, puis avec de l'hexaméthyldisilazane, en mélangeant pendant 15 à 30 minutes et en mettant à une température de 100 à 400.degrés.C pour une période de 1 à 6 h.
Note: Claims are shown in the official language in which they were submitted.
Note: Descriptions are shown in the official language in which they were submitted.
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Title | Date |
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Forecasted Issue Date | 2001-08-07 |
(22) Filed | 1997-04-25 |
Examination Requested | 1997-10-17 |
(41) Open to Public Inspection | 1997-10-26 |
(45) Issued | 2001-08-07 |
Expired | 2017-04-25 |
There is no abandonment history.
Note: Records showing the ownership history in alphabetical order.
Current Owners on Record |
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EVONIK DEGUSSA GMBH |
Past Owners on Record |
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DEGUSSA AG |
DEGUSSA AKTIENGESELLSCHAFT |
DEGUSSA-HULS AKTIENGESELLSCHAFT |
HARTMANN, WERNER |
HENNIG, THOMAS |
JACOBSEN, HAUKE |
KARBE, HENNING |
MEYER, JURGEN |
SCHACHTELY, UWE |