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US4550054A
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Magnetic recording medium
Assignee: Konica Minolta Inc
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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 16:56
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.
References Cited (Backward Citations)
US4396659A
Cited
US4363850A
Cited
US4415630A
Cited
US4444850A
Cited
US4454202A
Cited
US4448848A
Cited
US4411956A
Cited
US4397751A
Cited
US4405684A
Cited
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 |