US4594174A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic paint for magnetic recording media
Assignee: Zeon Corp
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Filing: 1985-08-21
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Granted: 1986-06-10
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Expires: 2005-08-21
Abstract
Abstract A magnetic paint for use in magnetic recording media comprising a magnetic powder and as a binder therefor, a copolymer resin having a bonded carboxyl group content of 0.3 to 5.0% by weight, a bonded epoxy group content of at least 0.5% by weight, and a vinyl chloride unit content of at least 60% by weight.
Inventors
- 👤 Akira Nakayama
- 👤 Katsuya Nakamura
- 👤 Kotaro Hata
- 👤 Makoto Yamamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:09
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/702; G11B5/7023; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31551; Y10T428/31609
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
56 words
A magnetic paint for use in magnetic recording media comprising a magnetic powder and as a binder therefor, a copolymer resin having a bonded carboxyl group content of 0.3 to 5.0% by weight, a bonded epoxy group content of at least 0.5% by weight, and a vinyl chloride unit content of at least 60% by weight.
Claim 2
Dependent Claim
56 words
A magnetic paint for use in magnetic recording media comprising a magnetic powder and as a binder therefor, a copolymer resin having a bonded carboxyl group content of 0.3 to 5.0% by weight, a bonded epoxy group content of at least 0.5% by weight, and a vinyl chloride unit content of at least 60% by weight.
Claim 3
Dependent Claim
20 words
The magnetic paint of claim 1 wherein the copolymer resin has an average degree of polymerization of 100 to 900.
Claim 4
Dependent Claim
42 words
The magnetic paint of claim 1 wherein the copolymer resin is a copolymer derived from vinyl chloride, a radical polymerizable monomer having a carboxyl group, a radical polymerizable monomer having an epoxy group and as required, another monomer copolymerizable with these monomers.
Claim 5
Dependent Claim
37 words
The magnetic paint of claim 3 wherein the radical polymerizable monomer having a carboxyl group is selected from unsaturated monocarboxylic acids, unsaturated dicarboxylic acids, monoalkyl esters of unsaturated dicarboxylic acids, and monoalkanol esters of unsaturated dicarboxylic acids.
Claim 6
Dependent Claim
31 words
The magnetic paint of claim 3 wherein the radical polymerizable monomer having an epoxy group is selected from glycidyl ethers of unsaturated alcohols, glycidyl esters of unsaturated acids and olefin epoxides.
Claim 7
Dependent Claim
35 words
The magnetic paint of claim 3 wherein the other monomer is selected from vinyl esters of carboxylic acids, vinyl ether, vinylidene halides, unsaturated carboxylic acid esters, olefins, unsaturated alcohols, unsaturated nitriles and aromatic vinyl compounds.
Claim 8
Dependent Claim
41 words
The magnetic paint of claim 1 wherein the copolymer resin is the addition-reaction product of a copolymer of vinyl chloride, a monomer having an epoxy group and optionally another monomer copolymerizable with these monomers, with a compound having a carboxyl group.
Claim 9
Dependent Claim
31 words
The magnetic paint of claim 7 wherein the radical polymerizable monomer having an epoxy group is selected from glycidyl ethers of unsaturated alcohols, glycidyl esters of unsaturated acids, and olefin epoxides.
Claim 10
Dependent Claim
35 words
The magnetic paint of claim 7 wherein the other monomer is selected from vinyl esters of carboxylic acids, vinyl ethers, vinylidene halides, unsaturated carboxylic acid esters, olefins, unsaturated alcohols, unsaturated nitriles and aromatic vinyl compounds.
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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) | 1989-06-09 | 1989-12-09 | 1990-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-06-09 | 1993-12-09 | 1994-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-06-09 | 1997-12-09 | 1998-06-10 | $7700.00 | Window Closed / Lapsed |