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US4844980A
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Silica or silicic acid particles whose surface located hydroxyl groups are at least partially replaced by organic groups
Assignee: Evonik Operations GmbH
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Filing: 1987-04-24
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Granted: 1989-07-04
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Expires: 2007-04-24
Abstract
Abstract Silicic acid or silica particles having initially surface-located hydroxyl groups are modified by replacing at least partially the hydroxyl groups by an organic group to impart the particles with emulsion-breaking and foam-destroying properties. Processes for preparing the modified particles are also disclosed.
Inventors
- 👤 Burghard Gruning
- 👤 Ulrich Holtschmidt
- 👤 Gotz Koerner
- 👤 Gerd Rossmy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:33
CPC Classifications
C; C10; C10G; C10G33/00; C10G33/04; B; B01; B01D; B01D17/00; B01D17/02; B01D17/04; B01D17/047; B01D19/00; B01D19/02; B01D19/04; B01D19/0404; B01D19/0409; C01; C01B; C01B33/00; C01B33/113; C01B33/12; C01B33/18; C01B33/181; C09; C09C; C09C1/00; C09C1/28; C09C1/30; C09C1/3081; C01P; C01P2006/00; C01P2006/80; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2993; Y10T428/2995; Y10T428/31504; Y10T428/31652; Y10T428/31663
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
106 words
A composition of matter comprising: (a) silicic acid particles, and (b) an organic group of the formula: ##STR9## wherein R 1 is alkyl with 10-22 carbon atoms; R 2 is octylphenyl, nonylphenyl or dodecylphenyl; R 3 and R 4 are the same or different and selected from the group consisting of: lower alkyl with 1-4 carbon atoms, oxygen 0 0 .5' hydroxy and Y, wherein Y is a hydrolyzable group; n is 2 or 3 with the proviso that n=2 in at least 90 mole % of the group, and x=1-50, said organic group (b) being linked to (a) through a C--Si--O bridge of the group.
Claim 2
Dependent Claim
106 words
A composition of matter comprising: (a) silicic acid particles, and (b) an organic group of the formula: ##STR9## wherein R 1 is alkyl with 10-22 carbon atoms; R 2 is octylphenyl, nonylphenyl or dodecylphenyl; R 3 and R 4 are the same or different and selected from the group consisting of: lower alkyl with 1-4 carbon atoms, oxygen 0 0 .5' hydroxy and Y, wherein Y is a hydrolyzable group; n is 2 or 3 with the proviso that n=2 in at least 90 mole % of the group, and x=1-50, said organic group (b) being linked to (a) through a C--Si--O bridge of the group.
Claim 3
Dependent Claim
37 words
The composition of matter of claim 1, wherein the particles (a), prior to said linking with the group (b), have a specific surface of at least 50 m 2 /g and a particle size of ≦40 nm.
Claim 4
Dependent Claim
25 words
The composition of claim 1, wherein said group (b) replaces at least partly the hydroxyl groups which are present at the surface of the particles.
Claim 5
Dependent Claim
11 words
The composition of claim 1, wherein the particles are silicon dioxide,
Claim 6
Dependent Claim
41 words
The composition of claim 1, wherein Y is selected from the group consisting of --Cl, --OR 5 and --NR 8 , wherein R 5 is alkyl with 1-4 carbon atoms and R 8 is hydrogen or alkyl with 1-4 carbon atoms.
Claim 7
Dependent Claim
138 words
A composition of matter comprising: (a) silica particles having initially a specific surface of at least 50 m 2 /g and a particle size of ≦40 nm, and (b) an organic group of the formula: ##STR10## wherein R 1 is alkyl with 10-22 carbon atoms; R 2 is octylphenyl, nonylphenyl or dodecylphenyl; R 3 and R 4 are the same or different and selected from the group consisting of: lower alkyl with 1-4 carbon atoms, oxygen O 0 .5' hydroxy and Y, wherein Y is selected from the group consisting of: --Cl, --OR 5 and --NR 8 , wherein R 5 is alkyl with 1-4 carbon atoms, and R 8 is hydrogen or alkyl with 1-4 carbon atoms; n is 2 or 3 with the proviso that n=2 in at least 90 mole % of the group, and
Claim 8
Dependent Claim
138 words
A composition of matter comprising: (a) silica particles having initially a specific surface of at least 50 m 2 /g and a particle size of ≦40 nm, and (b) an organic group of the formula: ##STR10## wherein R 1 is alkyl with 10-22 carbon atoms; R 2 is octylphenyl, nonylphenyl or dodecylphenyl; R 3 and R 4 are the same or different and selected from the group consisting of: lower alkyl with 1-4 carbon atoms, oxygen O 0 .5' hydroxy and Y, wherein Y is selected from the group consisting of: --Cl, --OR 5 and --NR 8 , wherein R 5 is alkyl with 1-4 carbon atoms, and R 8 is hydrogen or alkyl with 1-4 carbon atoms; n is 2 or 3 with the proviso that n=2 in at least 90 mole % of the group, and
Claim 9
Dependent Claim
15 words
x=1-50, said organic group (b) being linked to (a) through a C-Si-O-bridge of the group.
Claim 10
Dependent Claim
15 words
x=1-50, said organic group (b) being linked to (a) through a C-Si-O-bridge of the group.
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