US5085911A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flexible magnetic disc with a two layer protective coating which top layer is a ultra violet radiation cured compound with specified elasticity modulus
Assignee: Fujifilm Holdings Corp
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Filing: 1990-06-12
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Granted: 1992-02-04
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Expires: 2010-06-12
Abstract
Abstract A novel flexible magnetic disc is provided comprising a protective layer on the periphery of a central hole, wherein the protective layer comprises of two layers, the lower one of the two layers being a composition mainly composed of a printing ink and the upper one being a composition mainly composed of a resin obtained by irradiating a radiation-polymerizable compound with radiation so that it cures.
Inventors
- 👤 Mikihiko Kato
- 👤 Yasushi Endo
- 👤 Toshio Kawamata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:17
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/72; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/25; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265; Y10T428/31504; Y10T428/31786
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
151 words
A flexible magnetic disc comprising a protective layer on the periphery of a central hole, wherein said protective layer comprises two layers, the lower one of said two layers being a composition comprising a particulate pigment having a particle diameter in the range of from 0.01 to 5 μm and a vehicle selected from the group consisting of vinyl chloride resin, polyester resin and polyethylene resin, said vehicle being contained in an amount of 30 to 80% by weight based on the total weight of the composition for the lower layer, and the upper one being a composition comprising a resin obtained by irradiating an ultraviolet-curing compound with ultraviolet light so that it cures, said protective layer having a total thickness in the range of from 2 to 30 μm, and said upper layer having an elasticity modulus in the range of from 1×10 -7 to 1×10 -11 kg/mm 2 .
Claim 2
Dependent Claim
151 words
A flexible magnetic disc comprising a protective layer on the periphery of a central hole, wherein said protective layer comprises two layers, the lower one of said two layers being a composition comprising a particulate pigment having a particle diameter in the range of from 0.01 to 5 μm and a vehicle selected from the group consisting of vinyl chloride resin, polyester resin and polyethylene resin, said vehicle being contained in an amount of 30 to 80% by weight based on the total weight of the composition for the lower layer, and the upper one being a composition comprising a resin obtained by irradiating an ultraviolet-curing compound with ultraviolet light so that it cures, said protective layer having a total thickness in the range of from 2 to 30 μm, and said upper layer having an elasticity modulus in the range of from 1×10 -7 to 1×10 -11 kg/mm 2 .
Claim 3
Dependent Claim
18 words
A flexible magnetic disc as claimed in claim 1, wherein said upper layer comprises a particulate matting agent.
Claim 4
Dependent Claim
36 words
A flexible magnetic disc as claimed in claim 2, wherein said matting agent is contained in an amount of 1 to 50% by weight based on the total weight of the composition for the upper layer.
Claim 5
Dependent Claim
26 words
A flexible magnetic disc as claimed in claim 1, wherein said upper layer has the elasticity modulus of 1×10 -7 to 1×10 -11 kg/mm 2 .
Claim 6
Dependent Claim
158 words
A flexible magnetic disc comprising a protective layer on the periphery of a central hole, wherein said protective layer comprises two layers, the lower one of said two layers being a composition comprising a particulate pigment having a particle diameter in the range of from 0.01 to 5 μm and a vehicle selected from the group consisting of a drying oil, a semidrying oil, a drying oil-modified resin and a semidrying oil-modified resin, said vehicle being contained in an amount of 30 to 30% by weight based on the total weight of the composition for the lower layer, and the upper one being a composition comprising a resin obtained by irradiating an ultraviolet-curing compound with ultraviolet light so that it cures, said protective layer having a total thickness in the range of from 2 to 30 μm, and said upper layer having an elasticity modulus in the range of from 1×10 -7 to 1×10 -11 kg/mm 2 .
Claim 7
Dependent Claim
158 words
A flexible magnetic disc comprising a protective layer on the periphery of a central hole, wherein said protective layer comprises two layers, the lower one of said two layers being a composition comprising a particulate pigment having a particle diameter in the range of from 0.01 to 5 μm and a vehicle selected from the group consisting of a drying oil, a semidrying oil, a drying oil-modified resin and a semidrying oil-modified resin, said vehicle being contained in an amount of 30 to 30% by weight based on the total weight of the composition for the lower layer, and the upper one being a composition comprising a resin obtained by irradiating an ultraviolet-curing compound with ultraviolet light so that it cures, said protective layer having a total thickness in the range of from 2 to 30 μm, and said upper layer having an elasticity modulus in the range of from 1×10 -7 to 1×10 -11 kg/mm 2 .
Claim 8
Dependent Claim
18 words
A flexible magnetic disc as claimed in claim 5, wherein said upper layer comprises a particulate matting agent.
Claim 9
Dependent Claim
36 words
A flexible magnetic discs as claimed in claim 4, wherein said matting agent is contained in an amount of 1 to 50% by weight based on the total weight of the composition for the upper layer.
Claim 10
Dependent Claim
26 words
A flexible magnetic disc as claimed in claim 5, wherein said upper layer has the elasticity modulus of 1×10 -7 to 1×10 -11 kg/m 2 .
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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) | 1995-02-03 | 1995-08-05 | 1996-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-02-03 | 1999-08-05 | 2000-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-02-03 | 2003-08-05 | 2004-02-04 | $7700.00 | Window Closed / Lapsed |