US4550054A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic recording medium
Assignee: Konica Minolta Inc
•
Filing: 1983-10-27
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Granted: 1985-10-29
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Expires: 2003-10-27
Abstract
Abstract A magnetic recording medium comprising a non-magnetic substrate, a magnetic layer comprising ferromagnetic particles, a binder group, and a titanate coupling agent, said binder group comprising at least one polyurethane resin and at least one of a nitrocellulose resin and an epoxy resin, said titanate coupling agent having 6 ligands wherein each ligand is free of ethylenically unsaturated double bonds.
Inventors
- 👤 Yasuhisa Yamauchi
- 👤 Masao Asano
- 👤 Mitsutaka Arai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:15
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/702; G11B5/7021; G11B5/7022; G11B5/7013; G11B5/7028; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/25; Y10T428/256; Y10T428/257; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/31504; Y10T428/31511; Y10T428/31551; Y10T428/31609; Y10T428/31971
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
63 words
A magnetic recording medium comprising a non-magnetic substrate, a magnetic layer comprising ferromagnetic particles, a binder group, and a titanate coupling agent, said binder group consisting at least one polyurethane resin and at least one of a nitrocellulose resin and an epoxy resin, and wherein said titanate coupling agent has 6 ligands, each of said ligands being free of ethylenically unsaturated double bonds.
Claim 2
Dependent Claim
63 words
A magnetic recording medium comprising a non-magnetic substrate, a magnetic layer comprising ferromagnetic particles, a binder group, and a titanate coupling agent, said binder group consisting at least one polyurethane resin and at least one of a nitrocellulose resin and an epoxy resin, and wherein said titanate coupling agent has 6 ligands, each of said ligands being free of ethylenically unsaturated double bonds.
Claim 3
Dependent Claim
20 words
A magnetic recording medium according to claim 1, wherein said ferromagnetic particles are preliminarily treated with said titanate coupling agent.
Claim 4
Dependent Claim
18 words
A magnetic recording medium according to claim 1, wherein said ferromagnetic particles are metallic particles having ferromagnetic properties.
Claim 5
Dependent Claim
18 words
A magnetic recording medium according to claim 3, wherein said metallic particles have iron as the main component.
Claim 6
Dependent Claim
16 words
A magnetic recoding medium according to claim 1, wherein said ferromagnetic particles are iron oxide particles.
Claim 7
Dependent Claim
18 words
A magnetic recording medium according to claim 5, wherein said iron oxide particles are Co-containing iron oxide particles.
Claim 8
Dependent Claim
21 words
A magnetic recording medium according to claim 5, wherein said Co-containing iron oxide particles are Co-containing gamma-Fe 2 O 3 particles.
Claim 9
Dependent Claim
22 words
A magnetic recording medium according to claim 1, wherein said binder group contains at least a nitrocellulose resin and a polyurethane resin.
Claim 10
Dependent Claim
24 words
A magnetic recording medium according to claim 8, wherein said ferromagnetic particles are selected from Co-containing iron oxide and metallic particles having ferromagnetic properties.
Claim 11
Dependent Claim
20 words
A magnetic recording medium according to claim 8, wherein said ferromagnetic particles are preliminarily treated with said titanate coupling agent.
Claim 12
Dependent Claim
47 words
A magnetic recording medium according to claim 8, wherein said titanate coupling agent is represented by the following formula: (R.sup.1 --O).sub.4 Ti.[P(OR.sup.2).sub.2 OH].sub.2 wherein R 1 is a straight or branched aliphatic hydrocarbon residue and R 2 is a straight or branched aliphatic or aromatic hydrocarbon residue.
Claim 13
Dependent Claim
18 words
A magnetic recording medium according to claim 11, wherein said R 1 is a branched aliphatic hydrocarbon residue.
Claim 14
Dependent Claim
44 words
A magnetic recording medium according to claim 11, wherein said R 1 is an aliphatic hydrocarbon residue having a total of 3 to 18 carbon atoms, and said R 2 is an aliphatic hydrocarbon residue having a total of 6 to 20 carbon atoms.
Claim 15
Dependent Claim
22 words
A magnetic recording medium according to claim 1, wherein said binder group contains at least an epoxy resin and a polyurethane resin.
Claim 16
Dependent Claim
47 words
A magnetic recording medium according to claim 14, wherein said titanate coupling agent is represented by the following formula: (R.sup.1 --O).sub.4 Ti.[P(OR.sup.2).sub.2 OH].sub.2 wherein R 1 is a straight or branched aliphatic hydrocarbon residue and R 2 is a straight or branched aliphatic or aromatic hydrocarbon residue.
Claim 17
Dependent Claim
18 words
A magnetic recording medium according to claim 15, wherein said R 1 is a branched aliphatic hydrocarbon residue.
Claim 18
Dependent Claim
44 words
A magnetic recording medium according to claim 15, wherein said R 1 is an aliphatic hydrocarbon residue having a total of 3 to 18 carbon atoms, and said R 2 is an aliphatic hydrocarbon residue having a total of 6 to 20 carbon atoms.
Claim 19
Dependent Claim
20 words
A magnetic recording medium according to claim 14, wherein said ferromagnetic particles are preliminarily treated with said titanate coupling agent.
Claim 20
Dependent Claim
16 words
A magnetic recording medium according to claim 14, wherein said epoxy resin is a phenoxy resin.
Claim 21
Dependent Claim
20 words
A magnetic recording medium according to claim 19, wherein said ferromagnetic particles are selected from metallic particles having ferromagnetic properties.
Claim 22
Dependent Claim
17 words
A magnetic recording medium according to claim 19, wherein said ferromagnetic particles are Co-containing iron oxide particles.
Claim 23
Dependent Claim
20 words
A magnetic recording medium according to claim 19, wherein said ferromagnetic particles are preliminarily treated with said titanate coupling agent.
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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) | 1988-10-28 | 1989-04-29 | 1989-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-10-28 | 1993-04-29 | 1993-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-10-28 | 1997-04-29 | 1997-10-29 | $7700.00 | Window Closed / Lapsed |