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US4501800A
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Magnetic recording media comprising organosilicones in a magnetic layer thereof
Assignee: Victor Company of Japan Ltd
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Filing: 1983-07-27
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Granted: 1985-02-26
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Expires: 2003-07-27
Abstract
Abstract Magnetic recording media are described which comprise a support having a magnetic recording layer thereon. The magnetic recording layer is made of a dispersion of magnetic particles in a binder and a specific type of organosilicone. The organosilicone is represented by the general formula ##STR1## in which R represents a monovalent saturated or unsaturated hydrocarbon having 7 to 21 carbon atoms, R 1 , R 2 and R 3 independently represent a methyl or RCOO group, R 4 is a saturated hydrocarbon group having 1 to 20 carbon atoms, and k, l, m and n are independently an integer provided that 1<K, 1≦l<200, 1≦m<200, 0≦n<300, and l+m+n≦500.
Inventors
- 👤 Kuniharu Fujiki
- 👤 Shigeru Hashimoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:43
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; Y10T428/31504; Y10T428/31652; Y10T428/31663
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
121 words
A magnetic recording medium which comprises a support having thereon a recording magnetic layer which is made of a dispersion of magnetic particles in a mixture of a binder and a lubricant, the lubricant being an organosilicone compound of the following general formula (A) ##STR5## in which each R represents a saturated or unsaturated monovalent hydrocarbon group having from 7 to 21 carbon atoms, R 1 , R 2 and R 3 independently represent a methyl or RCOO group wherein R has the same meaning as defined above, R 4 represents a monovalent saturated hydrocarbon group having from 1 to 20 carbon atoms, and k, l, m and n are independently an integer provided that l≦k<l+m+n, 1≦l≦200, 1≦m<200, 0≦n<300, and l+m+n≦500.
Claim 2
Dependent Claim
121 words
A magnetic recording medium which comprises a support having thereon a recording magnetic layer which is made of a dispersion of magnetic particles in a mixture of a binder and a lubricant, the lubricant being an organosilicone compound of the following general formula (A) ##STR5## in which each R represents a saturated or unsaturated monovalent hydrocarbon group having from 7 to 21 carbon atoms, R 1 , R 2 and R 3 independently represent a methyl or RCOO group wherein R has the same meaning as defined above, R 4 represents a monovalent saturated hydrocarbon group having from 1 to 20 carbon atoms, and k, l, m and n are independently an integer provided that l≦k<l+m+n, 1≦l≦200, 1≦m<200, 0≦n<300, and l+m+n≦500.
Claim 3
Dependent Claim
27 words
A magnetic recording medium according to claim 1, wherein said organosilicone compound is contained in an amount of from 0.5 to 10 wt% of said magnetic particles.
Claim 4
Dependent Claim
19 words
A magnetic recording medium according to claim 1, wherein in the formula (A), 1≦l<100, 1≦m<100, 0≦n<200, l+m+n≦300, and 0.1<(l+m)/n.
Claim 5
Dependent Claim
44 words
A magnetic recording medium according to claim 1, wherein in the formula (A), each R represents C 7 H 15 , R 1 , R 2 , and R 3 are independently CH 3 , and R 4 is C 10 H 11 .
Claim 6
Dependent Claim
16 words
A magnetic recording medium according to claim 1, wherein said medium is a video recording tape.
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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) | 1988-02-26 | 1988-08-27 | 1989-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-02-26 | 1992-08-27 | 1993-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-02-26 | 1996-08-27 | 1997-02-26 | $7700.00 | Window Closed / Lapsed |