US4419406A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic recording medium and production thereof
Assignee: TDK Corp
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Filing: 1982-03-29
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Granted: 1983-12-06
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Expires: 2002-03-29
Abstract
Abstract A magnetic recording medium having a magnetic layer on one surface of a substrate and a back layer on the other surface, which is characterized by that the back layer is that formed by dispering a filler such as carbon black, graphite, SiO 2 , TiO 2 , Al 2 O 3 ,Cr 2 O 3 , SiC, CeO 2 , CaCO 3 , zinc oxide, geothite, αFe 2 O 3 , talc, kaolin, CaSO 4 , boron nitride, Teflon powder, graphite fluoride, molybdenum disulfide, zirconia etc. In a binder containing a radiation sensitive curable resin such as acryl-modified vinyl chloride - vinyl acetate - vinyl alcohol copolymer, acryl-modified polyurethane elastomer, acryl-modified polyester resin, etc. and curing it prior to rolling. The obtained back layer is very tough and can reduce the number of dropouts.
Inventors
- 👤 Yukihiro Isobe
- 👤 Kazushi Tanaka
- 👤 Masaharu Nishimatsu
- 👤 Osamu Shinoura
- 👤 Yuichi Kubota
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:09
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/73; G11B5/735; G11B5/7356; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/31504; Y10T428/3154; Y10T428/31544
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
89 words
A magnetic recording tape having a magnetic layer on one surface of a substrate and an anti-static backing layer on the opposite surface of said substrate, said magnetic recording tape produced by a process comprising: (1) applying a magnetic layer on one surface of a substrate, (2) thereafter applying an anti-static layer, containing filler dispersed in a radiation-sensitive curable resin binder, to the opposite surface of said substrate, (3) irradiating said radiation-sensitive curable resin binder with active energy radiation to cure said resin binder, and (4) rolling said tape.
Claim 2
Dependent Claim
89 words
A magnetic recording tape having a magnetic layer on one surface of a substrate and an anti-static backing layer on the opposite surface of said substrate, said magnetic recording tape produced by a process comprising: (1) applying a magnetic layer on one surface of a substrate, (2) thereafter applying an anti-static layer, containing filler dispersed in a radiation-sensitive curable resin binder, to the opposite surface of said substrate, (3) irradiating said radiation-sensitive curable resin binder with active energy radiation to cure said resin binder, and (4) rolling said tape.
Claim 3
Dependent Claim
24 words
The magnetic recording tape according to claim 1 wherein said filler is a powder of a conductive substance such as carbon black, graphite etc.
Claim 4
Dependent Claim
67 words
The magnetic recording tape according to claim 1 wherein said filler is a powder of a highly tough material such as SiO 2 , TiO 2 , Al 2 O 3 , Cr 2 O 3 , SiC, CeO 2 , CaCO 3 , zinc oxide, geothite, αFe 2 O 3 , talc, kaolin, CaSO 4 , boron nitride, Teflon powder, graphite fluoride, molybdenum disulfide, zirconia etc.
Claim 5
Dependent Claim
81 words
A process for producing a magnetic recording tape having a magnetic layer on one surface of a substrate and an anti-static backing layer on the opposite surface of said substrate comprising: (1) applying a magnetic layer on one surface of a substrate, (2) thereafter applying an anti-static layer, containing filler dispersed in a radiation-sensitive curable resin binder, to the opposite surface of said substrate, (3) irradiating said radiation-sensitive curable resin binder with active energy radiation to cure said resin binder, and
Claim 6
Dependent Claim
81 words
A process for producing a magnetic recording tape having a magnetic layer on one surface of a substrate and an anti-static backing layer on the opposite surface of said substrate comprising: (1) applying a magnetic layer on one surface of a substrate, (2) thereafter applying an anti-static layer, containing filler dispersed in a radiation-sensitive curable resin binder, to the opposite surface of said substrate, (3) irradiating said radiation-sensitive curable resin binder with active energy radiation to cure said resin binder, and
Claim 7
Dependent Claim
28 words
The process for producing a magnetic recording tape according to claim 4 wherein the filler is a powder of a conductive substance such as carbon black, graphite etc.
Claim 8
Dependent Claim
68 words
The process for producing a magnetic recording tape according to claim 4 wherein the filler is a highly tough material such as SiO 2 , TiO 2 , Al 2 O 3 , Cr 2 O 3 , SiC, CeO 2 , CaCO 3 , zinc oxide, geothite, αFe 2 O 3 , talc, kaolin, CaSO 4 , boron nitride, Teflon powder, graphite fluoride, molybdenum disulfide, zirconia etc.
Claim 9
Dependent Claim
48 words
The process for producing a magnetic recording tape according to claim 4 which is characterized by that an electron radiation accelerator of 100-750 kV is used as the active energy radiation source and irradiation is effected in an inert gas so that the absorbed dose be 0.5-20 Mrad.
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) | 1986-12-05 | 1987-06-06 | 1987-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-05 | 1991-06-06 | 1991-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-05 | 1995-06-06 | 1995-12-06 | $7700.00 | Window Closed / Lapsed |