US4007313A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic recording medium
Assignee: Shin-Etsu Chemical Co Ltd
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Filing: 1975-10-01
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Granted: 1977-02-08
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Expires: 1995-10-01
Abstract
Abstract A magnetic recording medium including a flexible non-magnetic film base and a magnetic layer thereon which contains and/or is coated with an organosilicon compound having lubricating properties, said compound having the following formula: <IMAGE> WHERE R is a saturated or unsaturated aliphatic group having from 7 to 17 carbon atoms and n is an integer from 1 to 3. The static friction coefficient and the tendency of the magnetic layer to shed powder are both substantially reduced in the improved magnetic recording medium of the present invention.
Inventors
- 👤 Shigetaka Higuchi
- 👤 Yoshiaki Hisagen
- 👤 Minoru Takamizawa
- 👤 Masatoshi Takita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:22
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/71; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2993; Y10T428/2995; Y10T428/31504; Y10T428/31652; Y10T428/31663; Y10T428/31667; Y10T428/31786
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
77 words
In a magnetic recording medium having a non-magnetic base and a magnetic layer formed thereon containing magnetizable particles dispersed in a resinous binder, the improvement comprising said magnetic layer having an organosilicon compound represented by the formula ##STR17## where R is an aliphatic group having from 7 to 17 carbon atoms and n is an integer from 1 to 3, said organosilicon compound being present in an amount sufficient to provide lubricating properties to said magnetic layer.
Claim 2
Dependent Claim
77 words
In a magnetic recording medium having a non-magnetic base and a magnetic layer formed thereon containing magnetizable particles dispersed in a resinous binder, the improvement comprising said magnetic layer having an organosilicon compound represented by the formula ##STR17## where R is an aliphatic group having from 7 to 17 carbon atoms and n is an integer from 1 to 3, said organosilicon compound being present in an amount sufficient to provide lubricating properties to said magnetic layer.
Claim 3
Dependent Claim
18 words
A magnetic recording medium according to claim 1, wherein said organosilicon compound is contained in said magnetic layer.
Claim 4
Dependent Claim
21 words
A magnetic recording medium according to claim 1, wherein said organosilicon compound is coated on the surface of said magnetic layer.
Claim 5
Dependent Claim
37 words
A magnetic recording medium according to claim 1, wherein from 0.3 to 5 parts by weight of said organosilicon compound are provided for each 100 parts by weight of the magnetizable particles contained in the magnetic layer.
Claim 6
Dependent Claim
18 words
A magnetic recording medium according to claim 1, which further includes an antistatic agent and a dispersing agent.
Claim 7
Dependent Claim
32 words
A magnetic recording medium according to claim 1, wherein said magnetic layer includes two or more of said organosilicon compounds in combination, each represented by the formula set forth in claim 1.
Claim 8
Dependent Claim
17 words
A magnetic recording medium according to claim 1, wherein said aliphatic group is a saturated aliphatic group.
Claim 9
Dependent Claim
17 words
A magnetic recording medium according to claim 1, wherein said aliphatic group is an unsaturated aliphatic group.
References Cited (Backward Citations)
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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) | 1980-02-08 | 1980-08-09 | 1981-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-02-08 | 1984-08-09 | 1985-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-02-08 | 1988-08-09 | 1989-02-08 | $7700.00 | Window Closed / Lapsed |