US4601947A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic recording medium
Assignee: TDK Corp
•
Filing: 1984-10-04
•
Granted: 1986-07-22
•
Expires: 2004-10-04
Abstract
Abstract A magnetic recording medium, produced by preparing a resin solution for magnetic paint having as a main component thereof a copolymer of (A) vinyl chloride, (B) a vinyl carboxylate, (C) an unsaturated carboxylic acid, (D) an unsaturated carboxylic anhydride and (E) vinyl alcohol, containing 50 to 90% by weight of (A) based on the total of the amounts of (A), (B) and (E), 1 to 15% by weight of (E) based on the total of the amounts of (A), (B) and (E), 0 to 30% by weight of (D) based on the total of amounts of (C) and (D), and 1 to 5 parts by weight of the total of (C) and (D) based on 100 parts by weight of the total of (A), (B) and (E) and having an average polymerization degree of 100 to 400, mixing 10 to 80% by weight of said resin solution with 90 to 20% by weight of a radiation curable resin, blending the resultant mixture as a main component with a magnetic powder, applying the resultant magnetic paint to a non-magnetic substrate, and curing the applied layer of paint with radiation.
Inventors
- 👤 Shigeru Shimada
- 👤 Yuichi Kubota
- 👤 Masaharu Nishimatsu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 20:12
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/702; G11B5/7023; G11B5/7026; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265; Y10T428/31504; Y10T428/31786; Y10T428/31855; Y10T428/31935
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
188 words
A magnetic recording medium, produced by preparing a resin solution for magnetic paint having as a main component thereof a copolymer of (A) vinyl chloride, (B) a vinyl carboxylate, (C) an unsaturated carboxylic acid, (D) an unsaturated carboxylic anhydride and (E) vinyl alcohol, containing 50 to 90% by weight of (A) based on the total of the amounts of (A), (B) and (E), 1 to 15% by weight of (E) based on the total of the amounts of (A), (B) and (E), 0 to 30% by weight of (D) based on the total of amounts of (C) and (D), and 1 to 5 parts by weight of the total of (C) and (D) based on 100 parts by weight of the total of (A), (B) and (E) and having an average polymerization degree of 100 to 400, mixing 10 to 80% by weight of said resin solution with 90 to 20% by weight of a radiation curable resin, blending the resultant mixture as a main component with a magnetic powder, applying the resultant magnetic paint to a non-magnetic substrate, and curing the applied layer of paint with radiation.
Claim 2
Dependent Claim
188 words
A magnetic recording medium, produced by preparing a resin solution for magnetic paint having as a main component thereof a copolymer of (A) vinyl chloride, (B) a vinyl carboxylate, (C) an unsaturated carboxylic acid, (D) an unsaturated carboxylic anhydride and (E) vinyl alcohol, containing 50 to 90% by weight of (A) based on the total of the amounts of (A), (B) and (E), 1 to 15% by weight of (E) based on the total of the amounts of (A), (B) and (E), 0 to 30% by weight of (D) based on the total of amounts of (C) and (D), and 1 to 5 parts by weight of the total of (C) and (D) based on 100 parts by weight of the total of (A), (B) and (E) and having an average polymerization degree of 100 to 400, mixing 10 to 80% by weight of said resin solution with 90 to 20% by weight of a radiation curable resin, blending the resultant mixture as a main component with a magnetic powder, applying the resultant magnetic paint to a non-magnetic substrate, and curing the applied layer of paint with radiation.
Claim 3
Dependent Claim
31 words
A magnetic recording medium according to claim 1, wherein said magnetic powder is contained therein in an amount of 200 to 900% by weight based on the total amount of resin.
Claim 4
Dependent Claim
38 words
A magnetic recording medium according to claim 2, wherein said resin solution for magnetic paint is contained in an amount of 20 to 70% by weight based on 80 to 30% by weight of said radiation curable resin.
Claim 5
Dependent Claim
116 words
A magnetic recording medium according to claim 1, wherein (A) said vinyl chloride is contained in an amount of 60 to 80% by weight based on the total of the amounts of (A) said vinyl chloride and (B) said vinyl carboxylate and (E) vinyl alcohol; (E) said vinyl alcohol is contained in an amount of 1 to 15% by weight based on total of the amounts of (A) said vinyl chloride, (B) said vinyl carboxylate and (E) said vinyl alcohol; and (D) said unsaturated carboxylic anhydride is contained in an amount of 0 to 30% by weight based on the total of the amounts of (C) said unsaturated carboxylic acid and (D) said unsaturated carboxylic anhydride.
Claim 6
Dependent Claim
59 words
A magnetic recording medium according to claim 4, wherein the total of the amount of (C) said unsaturated carboxylic acid and (D) said unsaturated carboxylic anhydride is 1 to 4 parts by weight based on 100 parts by weight of the total of the amounts of (A) said vinyl chloride, (B) said vinyl carboxylate and (E) said vinyl alcohol.
Claim 7
Dependent Claim
80 words
A magnetic recording medium according to claim 1, wherein (B) said vinyl carboxylate is at least one member selected from the group consisting of vinyl acetate, vinyl propionate and Vinyl Versatate, (C) said unsaturated carboxylic acid is at least one member selected from the group consisting of maleic acid, itaconic acid, fumaric acid, acrylic acid and methacrylic acid and (D) said unsaturated carboxylic anhydride is at least one member selected from the group consisting of maleic anhydride and itaconic anhydride.
Claim 8
Dependent Claim
33 words
A magnetic recording medium according to claim 6, wherein (B) said vinyl carboxylate is vinyl acetate, (C) said unsaturated carboxylic acid is maleic acid and (D) said unsaturated carboxylic anhydride is maleic anhydride.
Claim 9
Dependent Claim
26 words
A magnetic recording medium according to claim 1, wherein said applied layer of magnetic paint has a thickness of 0.5 to 20 μm on dry basis.
Claim 10
Dependent Claim
17 words
A magnetic recording medium according to claim 8, wherein said non-magnetic substrate is a polyethylene terephthalate film.
References Cited (Backward Citations)
US4004997A
Cited
US4368239A
Cited
US4434210A
Cited
US4448846A
Cited
JPS57128711A
Cited
US4448848A
Cited
US4407853A
Cited
US4428974A
Cited
US4476035A
Cited
US4559265A
Cited
US4560617A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-07-21 | 1990-01-20 | 1990-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-07-21 | 1994-01-20 | 1994-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-07-21 | 1998-01-20 | 1998-07-22 | $7700.00 | Window Closed / Lapsed |