US4299882A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic recording medium and process
Assignee: Maxell Ltd
•
Filing: 1980-05-28
•
Granted: 1981-11-10
•
Expires: 2000-05-28
Abstract
Abstract A magnetic recording medium which comprises a base and a magnetic layer of a magnetic coating composition comprising magnetic particles and a binder provided on said base, characterized in that the magnetic coating composition further comprises a dialkylsulfosuccinate.
Inventors
- 👤 Fumio Togawa
- 👤 Haruo Andoh
- 👤 Toshihiko Tanabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:03
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/7013; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/25; Y10T428/256; Y10T428/257; Y10T428/258
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
65 words
A magnetic recording medium which comprises a base and a magnetic layer of a magnetic coating composition comprising magnetic particles and a binder provided on said base, said magnetic coating composition further comprising a dialkylsulfosuccinate which is present in the magnetic coating composition in an amount of 0.1 to 10% by weight, based on the weight of the magnetic particles in the magnetic coating composition.
Claim 2
Dependent Claim
65 words
A magnetic recording medium which comprises a base and a magnetic layer of a magnetic coating composition comprising magnetic particles and a binder provided on said base, said magnetic coating composition further comprising a dialkylsulfosuccinate which is present in the magnetic coating composition in an amount of 0.1 to 10% by weight, based on the weight of the magnetic particles in the magnetic coating composition.
Claim 3
Dependent Claim
40 words
The magnetic recording medium according to claim 1, wherein the dialkylsulfosuccinate is represented by the formula: ##STR2## wherein M is a metal atom and R 1 and R 2 are each an alkyl group having 3 to 18 carbon atoms.
Claim 4
Dependent Claim
14 words
The magnetic recording medium according to claim 2, wherein the dialkylsulfosuccinate is sodium dialkylsulfosuccinate.
Claim 5
Dependent Claim
14 words
The magnetic recording medium according to claim 3, wherein the dialkylsulfosuccinate is sodium dioctylsulfosuccinate.
Claim 6
Dependent Claim
17 words
The magnetic recording medium according to claim 1, wherein the magnetic particles are coated with the dialkylsulfosuccinate.
Claim 7
Dependent Claim
18 words
The magnetic recording medium according to claim 1, wherein the magnetic particles are cobalt-containing magnetic iron oxide particles.
Claim 8
Dependent Claim
147 words
A process for preparing a magnetic recording medium which comprises the steps of (1) reacting a cobalt salt with an alkali in an aqueous suspension containing magnetic iron oxide particles so as to deposit the produced cobalt compound on the surfaces of the magnetic iron oxide particles, (2) drying the cobalt-containing magnetic iron oxide particles, (3) admixing the dried cobalt-containing magnetic iron oxide particles with a binder in a suitable solvent to make a magnetic coating composition and (4) applying the magnetic coating composition on the surface of a base, said cobalt-containing magnetic iron oxide particles obtained in the step (1) being further coated with a dialkylsulfosuccinate at the surfaces prior to drying in step (2) said dialkylsulfosuccinate being present in the magnetic coating composition in an amount of 0.1 to 10% by weight, based on the weight of the magnetic particles in the magnetic coating composition.
Claim 9
Dependent Claim
147 words
A process for preparing a magnetic recording medium which comprises the steps of (1) reacting a cobalt salt with an alkali in an aqueous suspension containing magnetic iron oxide particles so as to deposit the produced cobalt compound on the surfaces of the magnetic iron oxide particles, (2) drying the cobalt-containing magnetic iron oxide particles, (3) admixing the dried cobalt-containing magnetic iron oxide particles with a binder in a suitable solvent to make a magnetic coating composition and (4) applying the magnetic coating composition on the surface of a base, said cobalt-containing magnetic iron oxide particles obtained in the step (1) being further coated with a dialkylsulfosuccinate at the surfaces prior to drying in step (2) said dialkylsulfosuccinate being present in the magnetic coating composition in an amount of 0.1 to 10% by weight, based on the weight of the magnetic particles in the magnetic coating composition.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-11-09 | 1985-05-11 | 1985-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-09 | 1989-05-11 | 1989-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-09 | 1993-05-11 | 1993-11-10 | $7700.00 | Window Closed / Lapsed |