Patent US4330600A successfully refreshed from Google Patents.
US4330600A
Expired / Lapsed
US
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Magnetic recording medium
Assignee: Sony Corp
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Filing: 1980-10-08
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Granted: 1982-05-18
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Expires: 2000-10-08
Abstract
Abstract A magnetic recording medium is disclosed in which dispersion characteristics of magnetizable particles in a magnetic paint is improved which results in improved saturation magnetic flux density and squareness ratio. The dispersion characteristics is improved by the treatment of magnetizable particle with a titanium alcoholate compound having at least one group easy to be hydrolyzed and at least one oleophilic group hard to be hydrolyzed in an organic solvent.
Inventors
- 👤 Kouichi Kawasumi
- 👤 Haruo Watanabe
- 👤 Junetsu Seto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:03
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/71; G11B5/712; Y; Y10; Y10S; Y10S428/00; Y10S428/90
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
94 words
A magnetic recording medium comprising a non-magnetizable base, and a magnetic layer formed thereon containing magnetizable particles and a resinous binder, said magnetic layer including a reaction product between a metallic hydroxide and a titanium compound having the grouping: ##STR46## where Ti is tetravalent titanium atom bonded to an alkoxy group, X, Y and Z are difficultly hydrolyzable oleophilic groups containing a hydrocarbon chain of from 1 to 50 carbon atoms, and a, b and c are integers of from 0 to 3, with a plus b plus c totalling from 1 to 3.
Claim 2
Dependent Claim
94 words
A magnetic recording medium comprising a non-magnetizable base, and a magnetic layer formed thereon containing magnetizable particles and a resinous binder, said magnetic layer including a reaction product between a metallic hydroxide and a titanium compound having the grouping: ##STR46## where Ti is tetravalent titanium atom bonded to an alkoxy group, X, Y and Z are difficultly hydrolyzable oleophilic groups containing a hydrocarbon chain of from 1 to 50 carbon atoms, and a, b and c are integers of from 0 to 3, with a plus b plus c totalling from 1 to 3.
Claim 3
Dependent Claim
39 words
A magnetic recording medium according to claim 1 in which said titanium compound is present in said magnetic layer in an amount of from 0.5 to 20 parts by weight per 100 parts by weight of said magnetizable particles.
Claim 4
Dependent Claim
38 words
A magnetic recording medium according to claim 1 wherein said titanium compound is present in said magnetic layer in an amount of from 1.0 to 15 parts by weight per 100 parts by weight of said magnetizable particles.
Claim 5
Dependent Claim
20 words
A magnetic recording medium according to claim 1 in which said alkoxy group contains from 1 to 15 carbon atoms.
Claim 6
Dependent Claim
37 words
A magnetic recording medium according to claim 1 in which said oleophilic group is selected from the group consisting of acyl groups, aryloxy groups, thioaryloxy groups, sulfonyl groups, sulfinyl groups, diester pyrophosphate groups, and diester phosphate groups.
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) | 1985-05-17 | 1985-11-16 | 1986-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-17 | 1989-11-16 | 1990-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-17 | 1993-11-16 | 1994-05-18 | $7700.00 | Window Closed / Lapsed |