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1. WO1998037017 - NEUTRAL-AGED HYDROPHOBIC ORGANOSILICATE-MODIFIED SILICA GELS

Publication Number WO/1998/037017
Publication Date 27.08.1998
International Application No. PCT/US1998/003155
International Filing Date 18.02.1998
Chapter 2 Demand Filed 18.06.1998
IPC
C01B 33/16 2006.01
CCHEMISTRY; METALLURGY
01INORGANIC CHEMISTRY
BNON-METALLIC ELEMENTS; COMPOUNDS THEREOF
33Silicon; Compounds thereof
113Silicon oxides; Hydrates thereof
12Silica; Hydrates thereof, e.g. lepidoic silicic acid
16Preparation of silica xerogels
C09C 1/30 2006.01
CCHEMISTRY; METALLURGY
09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
CTREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES; PREPARATION OF CARBON BLACK
1Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
28Compounds of silicon
30Silicic acid
CPC
C01B 33/16
CCHEMISTRY; METALLURGY
01INORGANIC CHEMISTRY
BNON-METALLIC ELEMENTS; COMPOUNDS THEREOF; ; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
33Silicon; Compounds thereof
113Silicon oxides; Hydrates thereof
12Silica; Hydrates thereof, e.g. lepidoic silicic acid
16Preparation of silica xerogels
C01P 2004/61
CCHEMISTRY; METALLURGY
01INORGANIC CHEMISTRY
PINDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
2004Particle morphology
60Particles characterised by their size
61Micrometer sized, i.e. from 1-100 micrometer
C01P 2006/12
CCHEMISTRY; METALLURGY
01INORGANIC CHEMISTRY
PINDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
2006Physical properties of inorganic compounds
12Surface area
C01P 2006/14
CCHEMISTRY; METALLURGY
01INORGANIC CHEMISTRY
PINDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
2006Physical properties of inorganic compounds
14Pore volume
C01P 2006/16
CCHEMISTRY; METALLURGY
01INORGANIC CHEMISTRY
PINDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
2006Physical properties of inorganic compounds
16Pore diameter
C01P 2006/22
CCHEMISTRY; METALLURGY
01INORGANIC CHEMISTRY
PINDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
2006Physical properties of inorganic compounds
22Rheological behaviour as dispersion, e.g. viscosity, sedimentation stability
Applicants
  • DOW CORNING CORPORATION [US]/[US]
Inventors
  • BURNS, Gary, T.
  • DENG, Qin
  • HAHN, James, R.
  • REESE, Clifford, C.
Agents
  • BOLEY, William, F.
Priority Data
08/801,41020.02.1997US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) NEUTRAL-AGED HYDROPHOBIC ORGANOSILICATE-MODIFIED SILICA GELS
(FR) SILICAGELS HYDROPHOBES MODIFIES PAR ORGANOSILICATE ET VIEILLIS A PH NEUTRE
Abstract
(EN)
The present invention is neutral-aged hydrophobic organosilicate-modified silica gels and a method for their preparation. The method comprises three steps, where in the first step an organosilicate-modified silica hydrosol is contacted with a strong mineral acid at a pH less than 1 to form an organosilicate-modified silica hydrogel. In the second step the organosilicate-modified silica hydrogel is aged at a pH within a range of pH 3.5 to pH 8. In the third step the neutral-aged organosilicate-modified silica hydrogel is contacted with an organosilicon compound in the presence of a catalytic amount of a strong acid to effect hydrophobing of the organosilicate-modified silica hydrogel to form a hydrophobic organosilicate-modified silica hydrogel having a surface area within a range of 100m2/g to 750 m2/g in the dry state. In a preferred process the hydrophobic organosilicate-modified silica hydrogel is contacted with a sufficient quantity of a water-immiscible organic solvent to convert the hydrophobic organosilicate-modified silica hydrogel into a hydrophobic organosilicate-modified silica organogel.
(FR)
Cette invention concerne des silicagels hydrophobes modifiés par oganosilicate et veillis à pH neutre ainsi qu'un procédé permettant de les préparer. Le procédé de préparation comprend trois étapes; dans la première étape on met en contact un hydrosol de silice modifié par organosilicate avec un acide minéral fort à un pH inférieur à 1 pour former un hydrogel de silice modifié par organosilicate; dans la deuxième étape on fait vieillir l'hydrogel de silice modifié par organosilicate à un pH compris entre 3,5 et 8; et dans la troisième étape on met en contact l'hydrogel de silice modifié par organosilicate vieilli à pH neutre, avec un composé organosilicié en présence d'une quantité catalytique d'un acide fort pour rendre hydrophobe l'hydrogel de silice modifié par organosilicate et former ainsi un hydrogel de silice hydrophobe modifié par organosilicate dont la surface active, mesurée à l'état sec, se situe entre 100 m2/g et 750 m2g. Dans un procédé de préparation préféré on met en contact l'hydrogel de silice hydrophobe modifié par organosilicate avec une quantité suffisante d'un solvant organique non miscible dans de l'eau pour transformer l'hydrogel de silice hydrophobe modifié par organosilicate en un organogel de silice hydrophophe modifié par oganosilicate.
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