US4844991A
Expired / Lapsed
US
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Magnetic recording medium and process for the preparation of the same
Assignee: Fujifilm Holdings Corp
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Filing: 1987-04-14
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Granted: 1989-07-04
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Expires: 2007-04-14
Abstract
Abstract A magnetic recording medium comprising a nonmagnetic support, a magnetic recording layer provided on the support which comprises a binder and a ferromagnetic powder dispersed therein, and a monomolecular film or a built-up film provided on the magnetic recording layer. The monomolecular or built-up film comprises a saturated fatty acid having 10-24 carbon atoms and/or its alkali metal salt which is oriented vertically to the plane of the film. A process for the preparation of the same is also disclosed.
Inventors
- 👤 Toshihiko Miura
- 👤 Masaaki Fujiyama
- 👤 Yutaka Kakuishi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 18:16
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/72; Y; Y10; Y10S; Y10S428/00; Y10S428/90
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
87 words
A magnetic recording medium comprising a non-magnetic support, a magnetic recording layer provided on the support which comprises a binder and a ferromagnetic powder dispersed therein, and a monommolecular film or a built-up film which has been rubbed with a metal provided on the magnetic recording layer in an amount of 1 to 50 mg/m 2 , said monomolecular or built-up film comprising a saturated fatty acid having 10-24 carbon atoms and/or an alkali metal salt thereof which is oriented vertically to the plane of the film.
Claim 2
Dependent Claim
87 words
A magnetic recording medium comprising a non-magnetic support, a magnetic recording layer provided on the support which comprises a binder and a ferromagnetic powder dispersed therein, and a monommolecular film or a built-up film which has been rubbed with a metal provided on the magnetic recording layer in an amount of 1 to 50 mg/m 2 , said monomolecular or built-up film comprising a saturated fatty acid having 10-24 carbon atoms and/or an alkali metal salt thereof which is oriented vertically to the plane of the film.
Claim 3
Dependent Claim
35 words
The magnetic recording medium as claimed in claim 1, wherein said saturated fatty acid and/or alkali metal salt thereof is a straight-chain saturated fatty acid having 12-22 carbon atoms and/or an alkali metal salt thereof.
Claim 4
Dependent Claim
36 words
The magnetic recording medium as claimed in claim 1, wherein said monomolecular film or built-up film comprises the saturated fatty acid and/or alkali metal salt thereof in an amount of 1 to 10 mg/m 2 .
Claim 5
Dependent Claim
105 words
A process for the preparation of a magnetic recording medium which comprises the steps of laminating a magnetic recording layer comprising a binder and a ferromagnetic powder dispersed therein on a non-magnetic support, then applying a coating solution containing a saturated fatty acid having 10-24 carbon atoms and/or an alkali metal salt thereof onto the surface of the magnetic recording layer to form a coated layer with a metal to form a monomolecular film layer of the saturated fatty acid and/or the alkali metal salt thereof in an amount of 1 to 50 mg/m 2 which is oriented vertically to the plane of the film.
Claim 6
Dependent Claim
105 words
A process for the preparation of a magnetic recording medium which comprises the steps of laminating a magnetic recording layer comprising a binder and a ferromagnetic powder dispersed therein on a non-magnetic support, then applying a coating solution containing a saturated fatty acid having 10-24 carbon atoms and/or an alkali metal salt thereof onto the surface of the magnetic recording layer to form a coated layer with a metal to form a monomolecular film layer of the saturated fatty acid and/or the alkali metal salt thereof in an amount of 1 to 50 mg/m 2 which is oriented vertically to the plane of the film.
Claim 7
Dependent Claim
33 words
The process as claimed in claim 4, wherein said saturated fatty acid and/or alkali metal salt thereof is a straight-chain saturated fatty acid having 12-22 carbon atoms and/or an alkali metal salt thereof.
Claim 8
Dependent Claim
14 words
The process as claimed in claim 4, wherein said metal is a stainless steel.
Claim 9
Dependent Claim
28 words
The process as claimed in claim 4, wherein the amount of the saturated fatty acid contained in the coated layer ranges from 1 to 10 mg/m 2 .
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) | 1992-07-03 | 1993-01-02 | 1993-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-03 | 1997-01-02 | 1997-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-03 | 2001-01-02 | 2001-07-04 | $7700.00 | Window Closed / Lapsed |