US4396674A
Expired / Lapsed
US
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Magnetic recording medium with amino lubricating layer
Assignee: Sony Corp
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Filing: 1982-02-11
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Granted: 1983-08-02
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Expires: 2002-02-11
Abstract
Abstract The magnetic recording media are constructed such that a lubricating layer containing an amine compound represented by the formula: <IMAGE> (wherein R is a hydrocarbon residue having from 7 to 21 carbon atoms and n is an integer ranging from 1 to 10) is disposed on at least one surface of a non-magnetic substrate with a magnetic layer. The magnetic recording media have an improved lubricating characteristics with a low friction coefficient.
Inventors
- 👤 Masashi Somezawa
- 👤 Shigeo Kimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:12
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/72; G11B5/725; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/27; Y10T428/273; Y10T428/31504; Y10T428/31725; Y10T428/31736
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
48 words
A magnetic recording medium comprising a non-magnetic substrate, a magnetic layer and a lubricating layer comprising an amine compound represented by the formula: ##STR3## (wherein R is a higher hydrocarbon residue having from 7 to 21 carbon atoms and n is an integer ranging from 1 to 10).
Claim 2
Dependent Claim
48 words
A magnetic recording medium comprising a non-magnetic substrate, a magnetic layer and a lubricating layer comprising an amine compound represented by the formula: ##STR3## (wherein R is a higher hydrocarbon residue having from 7 to 21 carbon atoms and n is an integer ranging from 1 to 10).
Claim 3
Dependent Claim
26 words
The magnetic recording medium according to claim 1 wherein the lubricating layer is disposed on the magnetic layer formed on the surface of the non-magnetic substrate.
Claim 4
Dependent Claim
31 words
The magnetic recording medium according to claim 1 wherein the lubricating layer is disposed on the surface of the non-magnetic substrate with the magnetic layer disposed on the other surface thereof.
Claim 5
Dependent Claim
40 words
The magnetic recording medium according to claim 1 wherein the lubricating layer is disposed on the surface of a back coating layer formed on the surface of the non-magnetic substrate with the magnetic layer diposed on the other surface thereof.
Claim 6
Dependent Claim
36 words
The magnetic recording medium according to any one of claims 1 through 4 wherein the amine compound is contained in the amount ranging from about 1 to 1,000 mg per square meter in the lubricating layer.
Claim 7
Dependent Claim
22 words
The magnetic recording medium according to claim 5 wherein the amine compound is lauryl diethanol amine, stearyl diethanol amine or diheptaoxyethylene stearylamine.
Claim 8
Dependent Claim
27 words
The magnetic recording medium according to any one of claims 1 to 4 wherein the amine compound is lauryl diethanol amine, stearyl diethanol amine or diheptaoxyethylene stearylamine.
References Cited (Backward Citations)
US4171399A
Cited
US4315052A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-08-01 | 1987-01-31 | 1987-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-01 | 1991-01-31 | 1991-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-01 | 1995-01-31 | 1995-08-02 | $7700.00 | Window Closed / Lapsed |