US4956015A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polishing composition
Assignee: Fujimi Inc
•
Filing: 1989-01-18
•
Granted: 1990-09-11
•
Expires: 2009-01-18
Abstract
Abstract The present invention relates to a polishing composition comprising water, α-alumina and boehmite. The addition of boehmite contributes to an improvement of the polishing performance to provide an excellent polished surface and a high polishing rate. The polishing performance can further be improved by incorporating at least one member selected from the group consisting of a water-soluble metal salt, an ammonium salt and a metal nitrite. The polishing composition of the present invention is suitable for polishing metals, plastics or glass. It is particularly useful for polishing a surface of a memory hard disk plated with nickel or a nickel alloy.
Inventors
- 👤 Taizo Okajima
- 👤 Kouichi Ootani
- 👤 Tsutomu Yamada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:53
CPC Classifications
C; C09; C09K; C09K3/00; C09K3/14; C09G; C09G1/00; C09G1/02
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
44 words
A polishing composition comprising water, α-alumina and boehmite wherein the α-alumina is in an amount of from 1 to 30% by weight and the boehmite is in an amount of from 0.1 to 20% by weight, based on the total amount of the composition.
Claim 2
Dependent Claim
44 words
A polishing composition comprising water, α-alumina and boehmite wherein the α-alumina is in an amount of from 1 to 30% by weight and the boehmite is in an amount of from 0.1 to 20% by weight, based on the total amount of the composition.
Claim 3
Dependent Claim
28 words
The composition according to claim 1, wherein the boehmite is in an amount of from 0.5 to 10% by weight based on the total amount of the composition.
Claim 4
Dependent Claim
20 words
The composition according to claim 1, wherein the α-alumina has an average particle size of from 0.1 to 10 μm.
Claim 5
Dependent Claim
28 words
The composition according to claim 1, wherein the α-alumina is the one obtained by calcining an alumina other than α-alumina at a temperature of at least 1,200° C.
Claim 6
Dependent Claim
26 words
The composition according to claim 1, which further contains at least one member selected from the group consisting of a surfactant, cellulose and a cellulose derivative.
Claim 7
Dependent Claim
63 words
A polishing composition comprising water, α-alumina, boehmite and a water-soluble metal salt wherein the α-alumina is in an amount of from 1 to 30% by weight, the boehmite is in an amount of from 0.1 to 20% by weight and the water-soluble metal salt is in an amount of from 0.1 to 20% by weight, based on the total amount of the composition.
Claim 8
Dependent Claim
63 words
A polishing composition comprising water, α-alumina, boehmite and a water-soluble metal salt wherein the α-alumina is in an amount of from 1 to 30% by weight, the boehmite is in an amount of from 0.1 to 20% by weight and the water-soluble metal salt is in an amount of from 0.1 to 20% by weight, based on the total amount of the composition.
Claim 9
Dependent Claim
24 words
The composition according to claim 6, wherein the water-soluble metal salt has a solubility of at least 1 g per 100 g of water.
Claim 10
Dependent Claim
21 words
The composition according to claim 6, wherein the water-soluble metal salt is an inorganic acid salt of an alkaline earth metal.
Claim 11
Dependent Claim
35 words
The composition according to claim 6, wherein the water-soluble metal salt is at least one member selected from the group consisting of magnesium nitrate, magnesium chloride, magnesium sulfate, calcium nitrate, aluminum nitrate and aluminum sulfate.
Claim 12
Dependent Claim
28 words
The composition according to claim 7, wherein the boehmite is in an amount of from 0.5 to 10% by weight based on the total amount of the composition.
Claim 13
Dependent Claim
26 words
The composition according to claim 7, which further contains at least one member selected from the group consisting of a surfactant, cellulose and a cellulose derivative.
Claim 14
Dependent Claim
73 words
A polishing composition comprising water, α-alumina, boehmite and an ammonium salt of an inorganic or organic acid wherein the α-alumina is in an amount of from 1 to 30% by weight, the boehmite is in an amount of from 0.1 to 20% by weight and the ammonium salt of an inorganic or organic acid is in an amount of from 0.1 to 20% by weight, based on the total amount of the composition.
Claim 15
Dependent Claim
73 words
A polishing composition comprising water, α-alumina, boehmite and an ammonium salt of an inorganic or organic acid wherein the α-alumina is in an amount of from 1 to 30% by weight, the boehmite is in an amount of from 0.1 to 20% by weight and the ammonium salt of an inorganic or organic acid is in an amount of from 0.1 to 20% by weight, based on the total amount of the composition.
Claim 16
Dependent Claim
34 words
The composition according to claim 12, wherein the ammonium salt of an inorganic or organic acid is selected from the group consisting of ammonium nitrate, ammonium monohydrogenphosphate, ammonium chloride, ammonium sulfate and ammonium acetate.
Claim 17
Dependent Claim
18 words
The composition according to claim 12, wherein the ammonium salt is an ammounium salt of an inorganic acid.
Claim 18
Dependent Claim
17 words
The composition according to claim 14, wherein the ammonium salt of an inorganic acid is ammonium sulfate.
Claim 19
Dependent Claim
18 words
The composition according to claim 12, wherein the ammonium salt is an ammonium salt of an organic acid.
Claim 20
Dependent Claim
17 words
The composition according to claim 16, wherein the ammonium salt of an organic acid is ammonium acetate.
Claim 21
Dependent Claim
26 words
The composition according to claim 12, which further contains at least one member selected from the group consisting of a surfactant, cellulose and a cellulose derivative.
Claim 22
Dependent Claim
25 words
The composition according to claim 12, which is useful for polishing a surface of a memory hard disk plated with nickel or a nickel alloy.
Claim 23
Dependent Claim
61 words
A polishing composition comprising water, α-alumina, boehmite and a metal nitrite wherein the α-alumina is in an amount of from 1 to 30% by weight, the boehmite is in an amount of from 0.1 to 20% by weight, and the metal nitrite is in an amount of from 0.1 to 20% by weight, based on the total amount of the composition.
Claim 24
Dependent Claim
61 words
A polishing composition comprising water, α-alumina, boehmite and a metal nitrite wherein the α-alumina is in an amount of from 1 to 30% by weight, the boehmite is in an amount of from 0.1 to 20% by weight, and the metal nitrite is in an amount of from 0.1 to 20% by weight, based on the total amount of the composition.
Claim 25
Dependent Claim
26 words
The composition according to claim 20, wherein the metal nitrite is a nitrite of a metal in Group I, II or III of the Periodic Table.
Claim 26
Dependent Claim
23 words
The composition according to claim 20, wherein the nitrite is selected from the group consisting of sodium nitrite, potassium nitrite and calcium nitrite.
Claim 27
Dependent Claim
26 words
The composition according to claim 20, which further contains at least one member selected from the group consisting of a surfactant, cellulose and a cellulose derivative.
Claim 28
Dependent Claim
24 words
The composition according to claim 20, which is useful for polishing a surface of a memory hard disk plated with nickel or nickel alloy.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-09-10 | 1994-03-12 | 1994-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-09-10 | 1998-03-12 | 1998-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-09-10 | 2002-03-12 | 2002-09-11 | $7700.00 | Window Closed / Lapsed |