US4555449A
Expired / Lapsed
US
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Magnetic recording medium
Assignee: Union Carbide Corp
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Filing: 1984-02-09
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Granted: 1985-11-26
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Expires: 2004-02-09
Abstract
Abstract Described herein is a magnetic recording medium comprising a substrate and a magnetic recording layer thereon comprising a cured binder and magnetic particles, the binder containing a blend of a thermoplastic polymer or polymers and a polyfunctional acrylate derivatives of a caprolactone-polyol or a polyester polyol.
Inventors
- 👤 Joseph V. Koleske
- 👤 Glenn S. Peacock
- 👤 George T. Kwiatkowski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:28
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/702; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31551; Y10T428/31565; Y10T428/31855; Y10T428/31935
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
100 words
A magnetic recording medium comprising a substrate and a magnetic recording layer thereon comprising a cured binder and magnetic particles, the binder containing a blend of a thermoplastic polymer or polymers and a polyfunctional acrylate derivative of a caprolactone-polyol characterized by the formula: ##STR7## wherein R 1 is hydrogen or methyl, R 2 is the residue of a caprolactone-polyol having an average molecular weight of from about 200 to about 10,000, m is an integer of 2 to 8 and n is an integer of 0 to 6, with the proviso that the sum of m+n is 8 or less.
Claim 2
Dependent Claim
100 words
A magnetic recording medium comprising a substrate and a magnetic recording layer thereon comprising a cured binder and magnetic particles, the binder containing a blend of a thermoplastic polymer or polymers and a polyfunctional acrylate derivative of a caprolactone-polyol characterized by the formula: ##STR7## wherein R 1 is hydrogen or methyl, R 2 is the residue of a caprolactone-polyol having an average molecular weight of from about 200 to about 10,000, m is an integer of 2 to 8 and n is an integer of 0 to 6, with the proviso that the sum of m+n is 8 or less.
Claim 3
Dependent Claim
27 words
A magnetic recording medium as defined in claim 1 wherein R 2 is the residue of a caprolactone polyol prepared by the reaction of epsilon-caprolactone with trimethylolpropane.
Claim 4
Dependent Claim
26 words
A magnetic recording medium as defined in claim 1 wherein R 2 is the residue of a caprolactone-polyol prepared by the reaction of epsilon-caprolactone with pentaerythritol.
Claim 5
Dependent Claim
21 words
A magnetic recording medium as defined in claim 1 wherein R 1 is hydrogen, m is 3 and n is 0.
Claim 6
Dependent Claim
21 words
A magnetic recording medium as defined in claim 1 wherein R 1 is hydrogen, m is 4 and n is 0.
Claim 7
Dependent Claim
21 words
A magnetic recording medium as defined in claim 1 wherein R 1 is hydrogen, m is 5 and n is 0.
Claim 8
Dependent Claim
21 words
A magnetic recording medium as defined in claim 1 wherein R 1 is hydrogen, m is 6 and n is 0.
Claim 9
Dependent Claim
16 words
A magnetic recording medium as defined in claim 1 wherein the thermoplastic polymer contains a polyurethane.
Claim 10
Dependent Claim
16 words
A magnetic recording medium as defined in claim 1 wherein the thermoplastic polymer contains a poly(hydroxyether).
Claim 11
Dependent Claim
18 words
A magnetic recording medium as defined in claim 1 wherein the thermoplastic polymer contains a vinyl chloride copolymer.
Claim 12
Dependent Claim
25 words
A magnetic recording medium as defined in claim 1 wherein the thermoplastic polymer is a mixture of a polyurethane, a poly(hydroxyether), and/or a vinyl copolymer.
References Cited (Backward Citations)
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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) | 1988-11-25 | 1989-05-27 | 1989-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-11-25 | 1993-05-27 | 1993-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-11-25 | 1997-05-27 | 1997-11-26 | $7700.00 | Window Closed / Lapsed |