US4349608A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic recording medium
Assignee: Maxell Ltd
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Filing: 1981-08-19
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Granted: 1982-09-14
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Expires: 2001-08-19
Abstract
Abstract A magnetic recording medium improved in lubricity and abrasion resistance, which comprises a base material and a magnetic layer provided thereon, said magnetic layer comprising magnetic particles and a binder, characterized in that said magnetic layer further comprises at least one silicone compound of the formula: <IMAGE> wherein X is the same or different and -A-COOH, -A-OH, <IMAGE> or -A-NH2 in which A is a divalent hydrocarbon group having not more than 26 carbon atoms, Y and Y' are each -X or -CH3, p is an integer of 0 to 1,000 and q is an integer of 1 to 500 but p+q is not more than 1,000 in an amount of 0.1 to 5% by weight based on the weight of the magnetic particles in the magnetic layer.
Inventors
- 👤 Jozo Shimizu
- 👤 Satoru Yamaguchi
- 👤 Shigeo Aoyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:24
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; Y10T428/31511; Y10T428/31652; Y10T428/31663; Y10T428/31855; Y10T428/31935; Y10T428/31971
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
104 words
A magnetic recording medium which comprises a base material and a magnetic layer provided thereon, said magnetic layer comprising magnetic particles and a binder, characterized in that said magnetic layer further comprises at least one silicone compound of the formula: ##STR18## wherein X is the same or different and --A--COOH, --A--OH, ##STR19## or --A--NH 2 in which A is a divalent hydrocarbon group having not more than 26 carbon atoms, Y and Y' are each --X or --CH 3 , p is an integer of 0 to 1,000 and q is an integer of 1 to 500 but p+q is not more than 1,000.
Claim 2
Dependent Claim
104 words
A magnetic recording medium which comprises a base material and a magnetic layer provided thereon, said magnetic layer comprising magnetic particles and a binder, characterized in that said magnetic layer further comprises at least one silicone compound of the formula: ##STR18## wherein X is the same or different and --A--COOH, --A--OH, ##STR19## or --A--NH 2 in which A is a divalent hydrocarbon group having not more than 26 carbon atoms, Y and Y' are each --X or --CH 3 , p is an integer of 0 to 1,000 and q is an integer of 1 to 500 but p+q is not more than 1,000.
Claim 3
Dependent Claim
34 words
The magnetic recording medium according to claim 1, wherein the amount of the silicone compound is from 0.1 to 10% by weight based on the weight of the magnetic particles in the magnetic layer.
Claim 4
Dependent Claim
20 words
The magnetic recording medium according to claim 1, wherein the binder is a vinyl chloride resin or a cellulose resin.
References Cited (Backward Citations)
US4171406A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-09-13 | 1986-03-15 | 1986-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-09-13 | 1990-03-15 | 1990-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-09-13 | 1994-03-15 | 1994-09-14 | $7700.00 | Window Closed / Lapsed |