US4707380A
Expired / Lapsed
US
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Process for preparing a magnetic recording medium
Assignee: Fujifilm Holdings Corp
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Filing: 1986-06-17
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Granted: 1987-11-17
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Expires: 2006-06-17
Abstract
Abstract A process for preparing a magnetic recording medium is described, comprising subjecting a surface of a non-magnetic support having a surface roughness of not less than 0.01 μm to a non-contact surface treatment, providing a layer containing a compound polymerizable by radiation exposure on the surface of the support, exposing said layer to radiation, and then providing a magnetic layer on the radiation-exposed layer.
Inventors
- 👤 Hiroshi Hashimoto
- 👤 Tsutomu Okita
- 👤 Yoshito Mukaida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:15
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/84; G11B5/62; G11B5/73; G11B5/739; G11B5/73923; G11B5/73927; G11B5/73933
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
163 words
A process for preparing a magnetic recording medium comprising subjecting a surface of a non-magnetic support having a surface roughness of no less than 0.01 μm to a non-contact surface treatment, providing an intermediate layer containing a compound polymerizable by electron beam or ultraviolet radiation exposure on the surface of the support, wherein the intermediate layer is provided by coating a composition containing said compound polymerizable by electron beam or ultraviolet radiation exposure and having a viscosity of from 1 to 1,000 cps, exposing said intermediate layer to electron beam or ultraviolet radiation, and then providing a magnetic layer on the radiation-exposed intermediate layer, wherein said magnetic layer comprises ferromagnetic particles and a binder, further wherein at least the surface of the support which is subjected to non-contact surface treatment is the surface on which the intermediate layer containing the compound polymerizable by electron beam or ultraviolet radiation exposure is formed, wherein said composition provides a leveling effect before hardening by radiation exposure.
Claim 2
Dependent Claim
163 words
A process for preparing a magnetic recording medium comprising subjecting a surface of a non-magnetic support having a surface roughness of no less than 0.01 μm to a non-contact surface treatment, providing an intermediate layer containing a compound polymerizable by electron beam or ultraviolet radiation exposure on the surface of the support, wherein the intermediate layer is provided by coating a composition containing said compound polymerizable by electron beam or ultraviolet radiation exposure and having a viscosity of from 1 to 1,000 cps, exposing said intermediate layer to electron beam or ultraviolet radiation, and then providing a magnetic layer on the radiation-exposed intermediate layer, wherein said magnetic layer comprises ferromagnetic particles and a binder, further wherein at least the surface of the support which is subjected to non-contact surface treatment is the surface on which the intermediate layer containing the compound polymerizable by electron beam or ultraviolet radiation exposure is formed, wherein said composition provides a leveling effect before hardening by radiation exposure.
Claim 3
Dependent Claim
18 words
A process as in claim 1, wherein said non-contact surface treatment is an ultraviolet ray exposure surface treatment.
Claim 4
Dependent Claim
17 words
A process as in claim 1, wherein said non-contact surface treatment is a glow discharge surface treatment.
Claim 5
Dependent Claim
17 words
A process as in claim 1, wherein said non-contact surface treatment is a corona discharge surface treatment.
Claim 6
Dependent Claim
16 words
A process as in claim 1, wherein said non-contact surface treatment is a flame surface treatment.
Claim 7
Dependent Claim
18 words
A process as in claim 1, wherein said non-contact surface treatment is an electron beam exposure surface treatment.
Claim 8
Dependent Claim
22 words
A process as in claim 1, wherein the surface of said non-magnetic support has a surface roughness of 0.015 to 0.5 μm.
Claim 9
Dependent Claim
22 words
A process as in claim 2, wherein the surface of said non-magnetic support has a surface roughness of 0.015 to 0.5 μm.
Claim 10
Dependent Claim
22 words
A process as in claim 3, wherein the surface of said non-magnetic support has a surface roughness of 0.015 to 0.5 μm.
Claim 11
Dependent Claim
22 words
A process as in claim 4, wherein the surface of said non-magnetic support has a surface roughness of 0.015 to 0.5 μm.
Claim 12
Dependent Claim
22 words
A process as in claim 5, wherein the surface of said non-magnetic support has a surface roughness of 0.015 to 0.5 μm.
Claim 13
Dependent Claim
22 words
A process as in claim 6, wherein the surface of said non-magnetic support has a surface roughness of 0.015 to 0.5 μm.
Claim 14
Dependent Claim
21 words
A process as in claim 2, wherein said ultraviolet ray exposure is conducted using one or more high pressure mercury lamps.
Claim 15
Dependent Claim
21 words
A process as in claim 8, wherein said ultraviolet ray exposure is conducted using one or more high pressure mercury lamps.
Claim 16
Dependent Claim
41 words
A process as in claim 3, wherein said glow discharge is conducted by placing the support between a pair of electrodes in a vacuum chamber of from 0.01 to 20 Torr and applying a voltage of from 500 to 5,000 volts.
Claim 17
Dependent Claim
41 words
A process as in claim 9, wherein said glow discharge is conducted by placing the support between a pair of electrodes in a vacuum chamber of from 0.01 to 20 Torr and applying a voltage of from 500 to 5,000 volts.
Claim 18
Dependent Claim
24 words
A process as in claim 4, wherein said corona discharge is generated by a voltage of from 10 to 40 KV in a gas.
Claim 19
Dependent Claim
24 words
A process as in claim 10, wherein said corona discharge is generated by a voltage of from 10 to 40 KV in a gas.
Claim 20
Dependent Claim
46 words
A process as in claim 5, wherein said flame surface treatment is conducted by continuously moving the support at a speed of from 50 m/min to 800 m/min while exposing the support to a flame generated by burning a mixture of oxygen and a hydrocarbon gas.
Claim 21
Dependent Claim
46 words
A process as in claim 11, wherein said flame surface treatment is conducted by continuously moving the support at a speed of from 50 m/min to 800 m/min while exposing the support to a flame generated by burning a mixture of oxygen and a hydrocarbon gas.
Claim 22
Dependent Claim
39 words
A process as in claim 6, wherein said electron beam exposure is conducted at an accelerating voltage of from 10 to 300 KV to provide an absorption amount of from 1 to 10 Mrad using an electron beam accelerator.
Claim 23
Dependent Claim
39 words
A process as in claim 12, wherein said electron beam exposure is conducted at an accelerating voltage of from 10 to 300 KV to provide an absorption amount of from 1 to 10 Mrad using an electron beam accelerator.
Claim 24
Dependent Claim
19 words
A process as in claim 1, wherein the intermediate layer has a surface roughness of less than 0.01 μm.
Claim 25
Dependent Claim
15 words
A process as in claim 1, wherein said non-magnetic support is a polyethylene terephthalate film.
Claim 26
Dependent Claim
15 words
A process as in claim 1, wherein the viscosity is from 5 to 500 cps.
Claim 27
Dependent Claim
31 words
A process as in claim 1, wherein said non-contact surface treatment is selected from the group consisting of ultraviolet ray exposure, glow discharge, corona discharge, flame exposure and electron beam exposure.
Claim 28
Dependent Claim
23 words
A process as in claim 26, wherein said polymerizable compound is a compound having 1 to 10 carbon-carbon unsaturated bonds in its molecule.
Claim 29
Dependent Claim
39 words
A process as in claim 27, wherein said polymerizable compound is selected from the group consisting of acrylates, acrylamides, methacrylates, methacrylamides, allyl compounds, vinyl ethers, vinyl esters, vinyl heterocyclic compounds, N-vinyl compounds, styrenes, crotonic acids, itaconic acids and olefins.
Claim 30
Dependent Claim
23 words
A process as in claim 28, wherein said polymerizable compound is a compound having 2 or more acryloyl and/or methacryloyl groups per molecule.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-11-16 | 1991-05-18 | 1991-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-11-16 | 1995-05-18 | 1995-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-11-16 | 1999-05-18 | 1999-11-17 | $7700.00 | Window Closed / Lapsed |