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US4621027A
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Magnetic recording medium
Assignee: Fujifilm Holdings Corp
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Filing: 1984-10-29
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Granted: 1986-11-04
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Expires: 2004-10-29
Abstract
Abstract A magnetic recording medium is described, comprising a support and a magnetic layer disposed thereon, said magnetic layer containing as its binder component a combination of at least one member of each of the following groups of compounds (1) to (3) that has been exposed to electron beams: (1) vinyl chloride type resin, vinyl acetate type resin, vinyl chloride-vinyl acetate type resin, each containing from 5×10 -5 to 2×10 -3 equivalents of --CO 2 H groups per gram of copolymer, and nitrocellulose resin; (2) urethane resins and urethane-acrylate oligomers; and (3) compounds containing an isocyanurate ring and at least two groups selected from acryloyl and methacryloyl groups.
Inventors
- 👤 Tsutomu Okita
- 👤 Nobuo Tsuji
- 👤 Yoshito Mukaida
- 👤 Hiroshi Hashimoto
- 👤 Teruo Nakagawa
- 👤 Akiyoshi Hashimoto
- 👤 Takahisa Ogasawara, deceased
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:21
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/702; G11B5/7023; G11B5/7021; G11B5/7022; G11B5/7026; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31551; Y10T428/31609; Y10T428/31855; Y10T428/31935
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
108 words
A magnetic recording medium comprising a support and a magnetic layer disposed thereon, said magnetic layer containing as its binder component a combination of at least one member of each of the following groups of compounds (1) to (3) that has been exposed to electron beams: (1) vinyl chloride type resin, vinyl acetate type resin, chloride-vinyl acetate type resin, each vinyl containing from 5×10 -5 to 2×10 -3 equivalents of --CO 2 H groups per gram of copolymer, and nitrocellulose resin; (2) urethane resins and urethane-acrylate oligomers; and (3) compounds containing an isocyanurate ring and at least groups selected from two acryloyl and methacryloyl groups within the molecule.
Claim 2
Dependent Claim
108 words
A magnetic recording medium comprising a support and a magnetic layer disposed thereon, said magnetic layer containing as its binder component a combination of at least one member of each of the following groups of compounds (1) to (3) that has been exposed to electron beams: (1) vinyl chloride type resin, vinyl acetate type resin, chloride-vinyl acetate type resin, each vinyl containing from 5×10 -5 to 2×10 -3 equivalents of --CO 2 H groups per gram of copolymer, and nitrocellulose resin; (2) urethane resins and urethane-acrylate oligomers; and (3) compounds containing an isocyanurate ring and at least groups selected from two acryloyl and methacryloyl groups within the molecule.
Claim 3
Dependent Claim
43 words
A magnetic recording medium according to claim 1, wherein each of said compounds of group (3) containing an isocyanurate ring and at least two (metha)acryloyl groups is a di(metha)acrylate or tri(metha)acrylate of tris-2-hydroxyethyl isocyanurate or of an adduct of tris-2-hydroxyethyl isocyanurate and ε-caprolactone.
Claim 4
Dependent Claim
14 words
A magnetic recording medium according to claim 1, wherein said nitrocellulose is cellulose dinitrate.
Claim 5
Dependent Claim
27 words
A magnetic recording medium according to claim 1, wherein said urethane resin is a polyester urethane with a number average molecular weight of from 10,000 to 50,000.
Claim 6
Dependent Claim
41 words
A magnetic recording medium according to claim 1, wherein said urethane-acrylate oligomer is a reaction product of a urethane prepolymer containing isocyanato groups in at least one the terminal and side chain with a compound containing an acryloyl or methacryloyl group.
Claim 7
Dependent Claim
23 words
A magnetic recording medium according to claim 1, wherein said urethane-acrylate oligomer has a number average molecular weight of from 500 to 100,000.
Claim 8
Dependent Claim
23 words
A magnetic recording medium according to claim 1, wherein said urethane-acrylate oligomer has a number average molecular weight of from 1,000 to 30,000.
Claim 9
Dependent Claim
21 words
A magnetic recording medium according to claim 1, wherein said binder component further contains an electron beam-polymerizable compound containing carbon-carbon unsaturation.
Claim 10
Dependent Claim
32 words
A magnetic recording medium according to claim 1, wherein the compound selected from group (1) and the compound from group (2) are used in a weight ratio of from 20/80 to 90/10.
Claim 11
Dependent Claim
31 words
A magnetic recording medium according to claim 1, wherein the compound selected from group (1) and the compound from group (2) are used in a weight ratio from 40/60 to 80/20.
Claim 12
Dependent Claim
42 words
A magnetic recording medium according to claim 1, wherein the compound selected from group (3) is used in a proportion of from 20 to 150 parts by weight with respect to the combined weight of the compounds of groups (1) and (2).
Claim 13
Dependent Claim
42 words
A magnetic recording medium according to claim 1, wherein the compound selected from group (3) is used in a proportion of from 30 to 100 parts by weight with respect to the combined weight of the compounds of groups (1) and (2).
Claim 14
Dependent Claim
36 words
A magnetic recording medium according to claim 1, wherein said magnetic layer contains one or more members selected from the group consisting of lubricating agents, mild abrasives, dispersing agents, antistatic agents, rust inhibitors, fungicides and pigments.
Claim 15
Dependent Claim
31 words
A magnetic recording medium as in claim 1, wherein the vinyl chloride, vinyl acetate, or vinyl chloride-vinyl acetate resin contains from 3×10 -4 to 1×10 -3 equivalents per gram of copolymer.
Claim 16
Dependent Claim
101 words
A magnetic recording medium as in claim 1, wherein said urethane resin is a polyether or polyester urethane with a number average molecular weight of from 5,000 to 100,000; said urethane-acrylate oligomer has a number average molecular weight of from 500 to 100,000; the compound selected from group (1) and the compound selected from group (2) are used in a weight ratio of from 20/80 to 90/10; and the compound selected from group (3) is used in a proportion of from 20 to 150 parts by weight with respect to the combined weight of the compounds of groups (1) and (2).
Claim 17
Dependent Claim
101 words
A magnetic recording medium as in claim 1, wherein said urethane resin is a polyether or polyester urethane with a number average molecular weight of from 10,000 to 50,000; said urethane-acrylate oligomer has a number average molecular weight of from 1,000 to 30,000; the compound selected from group (1) and the compound selected from group (2) are used in a weight ratio of from 40/60 to 80/20; and the compound selected from group (3) is used in a proportion of from 30 to 100 parts by weight with respect to the combined weight of the compounds of groups (1) and (2).
Claim 18
Dependent Claim
32 words
A magnetic recording medium as claimed in claim 1, wherein the isocyanurate component is present in an amount of 3.55 wt % or more based on the total weight of the binders.
Claim 19
Dependent Claim
18 words
A magnetic recording medium as claimed in claim 1, wherein compound (1) is said vinyl chloride type resin.
Claim 20
Dependent Claim
18 words
A magnetic recording medium as claimed in claim 1, wherein compound (1) is said vinyl acetate type resin.
Claim 21
Dependent Claim
19 words
A magnetic recording medium as claimed in claim 1, wherein compound (1) is said vinyl chloride-vinyl acetate type resin.
Claim 22
Dependent Claim
15 words
A magnetic recording medium as claimed in claim 1, wherein compound (1) is said nitrocellulose.
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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) | 1989-11-03 | 1990-05-05 | 1990-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-11-03 | 1994-05-05 | 1994-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-11-03 | 1998-05-05 | 1998-11-04 | $7700.00 | Window Closed / Lapsed |