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US4664679A
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Aqueous dispersion of silicic anhydride and abrasive composition comprising the dispersion
Assignee: Mitsubishi Chemical Corp
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Filing: 1985-11-25
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Granted: 1987-05-12
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Expires: 2005-11-25
Abstract
Abstract An aqueous dispersion of silicic anhydride, comprising an aqueous solvent and silicic anhydride dispersed therein, wherein the silicic anhydride has a surfacial silanol group density of from 0.3 to 3 per 100 ANGSTROM 2 and is obtained by the surface treatment of silicic anhydride produced by a dry method.
Inventors
- 👤 Katsuhisa Kohyama
- 👤 Tsuneo Kimura
- 👤 Teruo Kidera
- 👤 Yukio Kajiwara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:32
CPC Classifications
C; C03; C03C; C03C17/00; C03C17/28; C01; C01B; C01B33/00; C01B33/113; C01B33/12; C01B33/14; C01B33/141; C01B33/1415; C01B33/1417; C01B33/145; C03C17/30; C03C23/00; C03C23/007; C03C25/00; C03C25/10; C03C25/465; C03C25/47; C09; C09K; C09K3/00; C09K3/14; C09K3/1454; C09K3/1463; H; H10; H10P; H10P52/00; H10P52/40; H10P52/402
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
54 words
An abrasive composition comprising an aqueous dispersion of silicic anhydride, which comprises an aqueous solvent and silicic anhydride dispersed therein, wherein the silicic anhydride has a surfacial silanol group density of from 0.3 to 3 per 100 Å 2 and is obtained by the surface treatment of silicic anhydride produced by a dry method.
Claim 2
Dependent Claim
54 words
An abrasive composition comprising an aqueous dispersion of silicic anhydride, which comprises an aqueous solvent and silicic anhydride dispersed therein, wherein the silicic anhydride has a surfacial silanol group density of from 0.3 to 3 per 100 Å 2 and is obtained by the surface treatment of silicic anhydride produced by a dry method.
Claim 3
Dependent Claim
17 words
The abrasive composition according to claim 1, wherein the aqueous dispersion of silicic anhydride further contains alumina.
Claim 4
Dependent Claim
23 words
The abrasive composition according to claim 2, wherein the abrasive comprises a mixture of the aqueous dispersion of silicic anhydride and alumina sol.
Claim 5
Dependent Claim
27 words
The abrasive composition according to claim 2, wherein alumina is present in an amount of from 0.5 to 2 times by weight the amount of silicic anhydride.
Claim 6
Dependent Claim
29 words
The abrasive composition according to claim 2, wherein silicic anhydride and alumina are present in a total amount of from 5 to 50% by weight in the aqueous dispersion.
Claim 7
Dependent Claim
20 words
The abrasive composition according to claim 2, wherein alumina has an average particle size of from 0.01 to 0.3 μm.
Claim 8
Dependent Claim
17 words
The abrasive composition accoridng to claim 6, wherein alumina has an average particle size of 0.1±0.06 μm.
Claim 9
Dependent Claim
22 words
The abrasive composition according to claim 1, wherein the silicic anhydride has an average particle size of from 0.01 to 1 μm.
Claim 10
Dependent Claim
22 words
The abrasive composition according to claim 1, wherein the silicic anhydride has an average particle size of from 0.01 to 0.1 μm.
Claim 11
Dependent Claim
27 words
The abrasive composition according to claim 1, wherein the surfacial silanol group density of the silicic anhydride is from 0.5 to 2.5 per 100 Å 2 .
Claim 12
Dependent Claim
28 words
The abrasive composition according to claim 1, wherein the surfacial silanol group density of the silicic anhydride is from 0.5 to under 2 per 100 Å 2 .
Claim 13
Dependent Claim
22 words
The abrasive composition according to claim 1, wherein the aqueous solvent is water or an aqueous solution containing a water-soluble organic solvent.
Claim 14
Dependent Claim
13 words
The abrasive composition according to claim 12 wherein the aqueous solvent is water.
Claim 15
Dependent Claim
37 words
The abrasive composition according to claim 1, wherein the surface treatment of silicic anhydride is conducted by a coupling reaction with a coupling agent, an esterification reaction with an alcohol or a dehydration condensation reaction under heating.
Claim 16
Dependent Claim
15 words
The abrasive composition according to claim 14, wherein the coupling agent is methyltrimethoxysilane or hexamethyldisilazane.
Claim 17
Dependent Claim
13 words
The abrasive composition according to claim 14, wherein the alcohol is n-butyl alcohol.
Claim 18
Dependent Claim
24 words
The abrasive composition according to claim 14, wherein the dehydration condensation reaction under heating is conducted at a temperature of at least 300° C.
Claim 19
Dependent Claim
24 words
The abrasive composition according to claim 17, wherein the dehydration condensation reaction under heating is conducted at a temperature of at least 500° C.
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1990-05-11 | 1990-11-10 | 1991-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-11 | 1994-11-10 | 1995-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-11 | 1998-11-10 | 1999-05-12 | $7700.00 | Window Closed / Lapsed |