Patent US4582323A successfully refreshed from Google Patents.
Patent US4415630A successfully refreshed from Google Patents.
US4415630A
Expired / Lapsed
US
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Process of making magnetic recording medium
Assignee: TDK Corp
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Filing: 1983-02-28
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Granted: 1983-11-15
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Expires: 2003-02-28
Abstract
Abstract A magnetic recording medium comprises a substrate and a magnetic recording layer formed thereon and which is made of a magnetic coating material consisting essentially of a magnetic powder dispersed in a binder, the coating material containing a titanium coupling agent. The magnetic powder is coated with the coupling agent or is mixed with the agent and then dispersed in the binder. The binder is prepared by mixing and plasticizing a radiation-sensitive modified resin with a radiation-sensitive soft resin and subjecting the mixture to radiation cross-linking and polymerization. Process for producing the medium comprises coating the magnetic particles with the titanium coupling agent, blending the coated particles with the binder to form a magnetic coating material, and then applying the material to the substrate. Alternatively, the process comprises mixing the titanium coupling agent with the magnetic particles, blending the mixture with the binder, and then applying the resulting coating material to the substrate. The titanium coupling agent is used in an amount of 0.5-7 wt %, preferably 0.5-3 wt %, based on the weight of the magnetic powder.
Inventors
- 👤 Yuichi Kubota
- 👤 Masaharu Nishimatsu
- 👤 Kazushi Tanaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:40
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/708; G11B5/712; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/31504; Y10T428/31678; Y10T428/31855; Y10T428/31935
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
47 words
A magnetic recording medium comprising a substrate and a magnetic recording layer formed thereon, characterized in that said magnetic recording layer is made of a magnetic coating material consisting essentially of a magnetic powder dispersed in a binder, said magnetic coating material containing a titanium coupling agent.
Claim 2
Dependent Claim
47 words
A magnetic recording medium comprising a substrate and a magnetic recording layer formed thereon, characterized in that said magnetic recording layer is made of a magnetic coating material consisting essentially of a magnetic powder dispersed in a binder, said magnetic coating material containing a titanium coupling agent.
Claim 3
Dependent Claim
21 words
A magnetic coating medium according to claim 1, wherein said magnetic powder has a surface coating of said titanium coupling agent.
Claim 4
Dependent Claim
25 words
A magnetic recording medium according to claim 1, wherein said magnetic powder is mixed with said titanium coupling agent and then dispersed in said binder.
Claim 5
Dependent Claim
92 words
A magnetic recording medium according to claim 1, 2 or 3, wherein said binder is one prepared by mixing and plasticizing a radiation-sensitive modified resin, which has radiation-sensitive, unsaturated bonds, such as acrylic, maleic, or allylic double bonds, and adapted to be cross-linked and polymerized by exposure to radiation, with a radiation-sensitive soft resin, which also has said double bonds, or a prepolymer, oligomer, or telomer thereof (with a dynamic modulus of less than 1×10 9 dyn/cm 2 at 20° C.) and then by subjecting the mixture to radiation cross-linking and polymerization.
Claim 6
Dependent Claim
35 words
A magnetic recording medium according to any of claims 1 to 4, wherein said magnetic powder is in the form of acicular particles of a cobalt-modified magnetic iron oxide and/or particles of a magnetic alloy.
Claim 7
Dependent Claim
25 words
A magnetic recording medium according to claim 4 or 5, wherein said cross-linking and polymerization by irradiation are carried out in an inert gas stream.
Claim 8
Dependent Claim
44 words
A process for producing a magnetic recording medium which comprises the steps of coating magnetic particles with a titanium coupling agent, blending the coated magnetic particles with a binder to obtain a magnetic coating material, and then applying the coating material to a substrate.
Claim 9
Dependent Claim
44 words
A process for producing a magnetic recording medium which comprises the steps of coating magnetic particles with a titanium coupling agent, blending the coated magnetic particles with a binder to obtain a magnetic coating material, and then applying the coating material to a substrate.
Claim 10
Dependent Claim
37 words
A process according to claim 7, which further comprises the step of drying the coated surfaces, after the coating of said magnetic particles with said coupling agent and before blending said coated particles with said binder resin.
Claim 11
Dependent Claim
49 words
A process for producing a magnetic recording medium which comprises the steps of mixing a titanium coupling agent with magnetic particles, blending the magnetic particles so mixed with said coupling agent with a binder to obtain a magnetic coating material, and then applying the coating material to a substrate.
Claim 12
Dependent Claim
49 words
A process for producing a magnetic recording medium which comprises the steps of mixing a titanium coupling agent with magnetic particles, blending the magnetic particles so mixed with said coupling agent with a binder to obtain a magnetic coating material, and then applying the coating material to a substrate.
Claim 13
Dependent Claim
31 words
A process according to claim 7, 8, or 9, wherein said titanium coupling agent is used in an amount of 0.5-7 weight percent based on the weight of said magnetic particles.
Claim 14
Dependent Claim
31 words
A process according to claim 7, 8 or 9, wherein said titanium coupling agent is used in an amount of 0.5-3 weight percent based on the weight of said magnetic particles.
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) | 1986-11-14 | 1987-05-16 | 1987-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-11-14 | 1991-05-16 | 1991-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-11-14 | 1995-05-16 | 1995-11-15 | $7700.00 | Window Closed / Lapsed |