US4469750A
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Magnetic recording media comprising fluorinated 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: 1984-09-04
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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 fatty acid-modified, fluorinated organosilicone. The organosilicone is represented by the general formula ##STR1## in which R 1 represents a monovalent saturated or unsaturated hydrocarbon having 7 to 21 carbon atoms, R 2 represents a methyl or phenyl group, each R 3 represents a OCOR 1 in which R 1 has the same meaning as defined above, Y represents --CF 3 or --(CF 2 )-- k W in which k is an integer of from 1 to 8, and W is hydrogen or fluorine, and l, m and n are independently an integer provided that 0≦l<200, 1≦m<100, 1≦n<100, and l+m+n≦300.
Inventors
- 👤 Kuniharu Fujiki
- 👤 Yukio Matsumoto
- 👤 Hiroshi Yoshida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:18
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; Y10T428/31786
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
135 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 a fatty acid-modified, fluorinated organosilicone compound of the following general formula (A) ##STR5## in which R 1 represents a monovalent saturated or unsaturated hydrocarbon group having from 7 to 21 carbon atoms, R 2 represents a methyl or phenyl group, each R 3 represents a OCOR 1 group wherein R 1 has the same meaning as defined above, Y represents --CF 3 or --(CF 2 )-- k W in which k is an integer of from 1 to 8, and W represents hydrogen or fluorine, l, m and n are independently an integer provided that 0≦l<200, 1≦m<100, 1≦n<100, and l+m+n≦300.
Claim 2
Dependent Claim
135 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 a fatty acid-modified, fluorinated organosilicone compound of the following general formula (A) ##STR5## in which R 1 represents a monovalent saturated or unsaturated hydrocarbon group having from 7 to 21 carbon atoms, R 2 represents a methyl or phenyl group, each R 3 represents a OCOR 1 group wherein R 1 has the same meaning as defined above, Y represents --CF 3 or --(CF 2 )-- k W in which k is an integer of from 1 to 8, and W represents hydrogen or fluorine, l, m and n are independently an integer provided that 0≦l<200, 1≦m<100, 1≦n<100, and l+m+n≦300.
Claim 3
Dependent Claim
28 words
A magnetic recording medium according to claim 1, wherein said oranosilicone compound is contained in an amount of from about 0.5 to 10 wt% of said magnetic particles.
Claim 4
Dependent Claim
16 words
A magnetic recording medium according to claim 1, wherein in the formula (A), 0≦l<100, and l+m+n≦200.
Claim 5
Dependent Claim
46 words
A magnetic recording medium according to claim 1, wherein in the formula (A), R 1 represents C 13 H 27 , R 2 represents CH 3 , each R 3 represents C 13 H 27 COO, and Y represents --(CF 2 ) 7 CF 3 .
Claim 6
Dependent Claim
46 words
A magnetic recording medium according to claim 1, wherein in the formula (A), R 2 represents a phenyl group and the phenyl group is contained in an amount of below about 10 mol% of the total organic groups joined to Si atoms in said organosilicone compound.
Claim 7
Dependent Claim
16 words
A magnetic recording medium according to claim 1, wherein said medium is a video recording tape.
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) | 1987-09-04 | 1988-03-05 | 1988-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-09-04 | 1992-03-05 | 1992-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-09-04 | 1996-03-05 | 1996-09-04 | $7700.00 | Window Closed / Lapsed |