US4915710A
Expired / Lapsed
US
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Abrasive composition and process for polishing
Assignee: Yamaguchi Seiken Kogyo Co Ltd
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Filing: 1989-03-16
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Granted: 1990-04-10
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Expires: 2009-03-16
Abstract
Abstract An abrasive composition particularly suitable for polishing an aluminum-based substrate for a magnetic recording disc, the composition comprising: an alumineous abrasive, preferably in an amount of 3 to 25% by weight; a polishing accelerator of gluconic and/or lactic acid, preferably in an amount of 0.1 to 3% by weight; optionally with sodium gluconate and/or sodium lactate in an amount of 0.1 to 3% by weight; colloidal alumina, preferably in an amount of 0.1 to 5% by weight; and water, the composition typically having a pH of 3 to 5.
Inventors
- 👤 Kunihiro Miyazaki
- 👤 Ken Ishitobi
- 👤 Yoshinobu Yamaguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:05
CPC Classifications
C; C23; C23F; C23F3/00; B; B24; B24D; B24D3/00; B24D3/34; B24D3/346; C09; C09G; C09G1/00; C09G1/02; C09K; C09K3/00; C09K3/14; C09K3/1454; C09K3/1463
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
28 words
An acid abrasive composition comprising an an aqueous slurry of alpha alumina, a polishing accelerator of gluconic and/or lactic acids, a surface modifier of colloidal alumina, and water.
Claim 2
Dependent Claim
28 words
An acid abrasive composition comprising an an aqueous slurry of alpha alumina, a polishing accelerator of gluconic and/or lactic acids, a surface modifier of colloidal alumina, and water.
Claim 3
Dependent Claim
17 words
A composition according to claim 1, further comprising another polishing accelerator of sodium gluconate and/or sodium lactate.
Claim 4
Dependent Claim
41 words
A composition according to claim 1, wherein the gluconic and/or lactic acids are contained in an amount of 0.1 to 3% by weight based on the total weight of the composition and the composition has a pH of 3 to 5.
Claim 5
Dependent Claim
29 words
A composition according to claim 1, wherein the colloidal alumina is contained in an amount of 0.1 to 5% by weight based on the total weight of the composition.
Claim 6
Dependent Claim
32 words
A composition according to claim 1, wherein the sodium gluconate and/or sodium lactate are contained in an amount of 0.1 to 3% by weight based on the total weight of the composition.
Claim 7
Dependent Claim
51 words
A composition according to claim 1, wherein the alpha alumina has a maximum particle size of not more than 25 μm and an average particle size of 0.5 to 15 μm, and is contained in an amount of 3 to 25% by weight based on the total weight of the composition.
Claim 8
Dependent Claim
78 words
An acid abrasive composition, for polishing an aluminum-based magnetic-recording-disc substrate, comprising an aqueous slurry of: 3 to 25% by weight of alpha alumina having a maximum particle size of not more than 25 μm and an average particle size of 0.5 to 15 μm; 0.1 to 3% by weight of a polishing accelerator of gluconic and/or lactic acids; 0.1 to 5% by weight of colloidal alumina; and water, wherein the composition has a pH of 3 to 5.
Claim 9
Dependent Claim
78 words
An acid abrasive composition, for polishing an aluminum-based magnetic-recording-disc substrate, comprising an aqueous slurry of: 3 to 25% by weight of alpha alumina having a maximum particle size of not more than 25 μm and an average particle size of 0.5 to 15 μm; 0.1 to 3% by weight of a polishing accelerator of gluconic and/or lactic acids; 0.1 to 5% by weight of colloidal alumina; and water, wherein the composition has a pH of 3 to 5.
Claim 10
Dependent Claim
17 words
A composition according to claim 7, further comprising another polishing accelerator of sodium gluconate and/or sodium lactate.
Claim 11
Dependent Claim
39 words
A process for polishing a workpiece with an acid abrasive composition comprising contacting a substrate with an aqueous slurry comprised of alpha alumina, a polishing accelerator of gluconic and/or lactic acids, a surface modifier of colloidal alumina, and water.
Claim 12
Dependent Claim
39 words
A process for polishing a workpiece with an acid abrasive composition comprising contacting a substrate with an aqueous slurry comprised of alpha alumina, a polishing accelerator of gluconic and/or lactic acids, a surface modifier of colloidal alumina, and water.
Claim 13
Dependent Claim
26 words
A process according to claim 9, wherein the workpiece is a substrate for a magnetic recording disc, made of one of aluminum and an aluminum alloy.
Claim 14
Dependent Claim
13 words
A process according to claim 10, wherein the substrate is plated with nickel-phosphine.
Claim 15
Dependent Claim
11 words
A process according to claim 10, wherein the substrate is anodized.
Claim 16
Dependent Claim
17 words
A process according to claim 9, further comprising another polishing accelerator of sodium gluconate and/or sodium lactate.
Claim 17
Dependent Claim
44 words
A process according to claim 9, wherein the abrasive composition contains the gluconic and/or lactic acids in an amount of 0.1 to 3% by weight based on the total weight of the composition and the abrasive composition has a pH of 3 to 5.
Claim 18
Dependent Claim
31 words
A process according to claim 9, wherein the abrasive composition contains the colloidal alumina in an amount of 0.1 to 5% by weight based on the total weight of the composition.
Claim 19
Dependent Claim
34 words
A process according to claim 9, wherein the abrasive composition contains the sodium gluconate and/or sodium lactate in an amount of 0.1 to 3% by weight based on the total weight of the composition.
Claim 20
Dependent Claim
55 words
A process according to claim 9, wherein the abrasive composition contains the alpha alumina in an amount of 3 to 25% by weight based on the total weight of the composition, the alpha alumina having a maximum particle size of not more than 25 μm and an average particle size of 0.5 to 15 μm.
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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) | 1993-04-09 | 1993-10-09 | 1994-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-04-09 | 1997-10-09 | 1998-04-10 | $3760.00 | Window Closed / Lapsed |
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