US5042991A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrophobically coated abrasive grain
Assignee: Imerys Fused Minerals Laufenburg GmbH
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Filing: 1990-03-12
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Granted: 1991-08-27
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Expires: 2010-03-12
Abstract
Abstract The strength and water resistance of the binding of abrasive grain on the basis of corundum or silicon carbide into synthetic resin bonded abrasive agents is improved by a surface treatment with microdispersed hydrophobic silicon dioxide.
Inventors
- 👤 Reiner Kunz
- 👤 Rudolf Strittmatter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 00:47
CPC Classifications
C; C09; C09K; C09K3/00; C09K3/14; C09K3/1436
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
32 words
Abrasive grain based on corundum or silicon carbide, characterized by a superficially adhering coating of 0.001 to 5.0 percent, relative to the weight of the abrasive grain, of microdispersed hydrophobic silicon dioxide.
Claim 2
Dependent Claim
32 words
Abrasive grain based on corundum or silicon carbide, characterized by a superficially adhering coating of 0.001 to 5.0 percent, relative to the weight of the abrasive grain, of microdispersed hydrophobic silicon dioxide.
Claim 3
Dependent Claim
28 words
Abrasive grain according to claim 1 wherein the coating is 0.1 to 1.0 percent, relative to the weight of the abrasive grain, of the microdispersed hydrophobic silicon dioxide.
Claim 4
Dependent Claim
43 words
Abrasive grain according to claim 2 wherein the microdispersed hydrophobic silicon dioxide has a particle size of the primary particles of 5 to 100 nm in d 50 value and a specific surface of 80 to 300 m 2 /g according to BET.
Claim 5
Dependent Claim
37 words
Abrasive grain according to claim 3 wherein the particle size of the primary particles is 7 to 20 nm in d 50 value and the specific surface is 100 to 150 m 2 /g according to BET.
Claim 6
Dependent Claim
41 words
Abrasive grain according to claim 4 wherein the abrasive grain is additionally treated by heat drying with a compound having the following formula: H.sub.2 N-(CH.sub.2).sub.n -Si(OR).sub.3 wherein n is 2 to 4 and R is a C 1 -C 4 -alkyl.
Claim 7
Dependent Claim
43 words
Abrasive grain according to claim 1 wherein the microdispersed hydrophobic silicon dioxide has a particle size of the primary particles of 5 to 100 nm in d 50 value and a specific surface of 80 to 300 m 2 /g according to BET.
Claim 8
Dependent Claim
37 words
Abrasive grain according to claim 6 wherein the particle size of the primary particles is 7 to 20 nm in d 50 value and the specific surface is 100 to 150 m 2 /g according to BET.
Claim 9
Dependent Claim
38 words
Abrasive grain according to claim 1 wherein the abrasive grain additionally treated with a silane having the following general formula: H.sub.2 N-(CH.sub.2).sub.n -Si(OR).sub.3 wherein n is 2 to 4 and R is a C 1 -C 4 -alkyl.
Claim 10
Dependent Claim
46 words
Process for producing the abrasive grain of claim 1, comprising coating untreated abrasive grain based on corundum or silicon carbide by mixing or spraying the untreated abrasive grain with a suspension of the microdispersed silicon dioxide in a vaporizable liquid and subsequent drying of the material.
Claim 11
Dependent Claim
14 words
Process comprising using the abrasive grain of claim 1 in synthetic resin bonded abrasives.
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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) | 1994-08-26 | 1995-02-25 | 1995-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-08-26 | 1999-02-25 | 1999-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-08-26 | 2003-02-25 | 2003-08-27 | $7700.00 | Window Closed / Lapsed |