US4668586A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic recording media
Assignee: BASF SE
•
Filing: 1985-10-15
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Granted: 1987-05-26
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Expires: 2005-10-15
Abstract
Abstract In magnetic recording media consisting of a non-magnetic base and, bonded on top of this, one or more magnetizable layers based on magnetic material finely dispersed in a polymer binder, a lubricant and further conventional additives, the lubricant used is a triethanolamine esterified with oleic acid.
Inventors
- 👤 Albert Kohl
- 👤 Milena Melzer
- 👤 August Lehner
- 👤 Norbert Schneider
- 👤 Eberhard Koester
- 👤 Werner Balz
- 👤 Friedrich Sommermann
- 👤 Ernst Ricker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 05:04
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/71; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31855; Y10T428/31935
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
77 words
A magnetic recording medium which comprises: (a) a non-magnetic base; (b) at least one magnetizable layer bonded to the base, said layer containing (b 1 ) a polymeric binder, (b 2 ) magnetic material finely dispersed in said binder, (b 3 ) from 0.1 to 2.0% by weight, based on the weight of the magnetic material of triethanolamine dioleate as the sole lubricant, and (b 4 ) a polymer of polyether-acrylate and (meth)acrylic acid as a dispersant.
Claim 2
Dependent Claim
77 words
A magnetic recording medium which comprises: (a) a non-magnetic base; (b) at least one magnetizable layer bonded to the base, said layer containing (b 1 ) a polymeric binder, (b 2 ) magnetic material finely dispersed in said binder, (b 3 ) from 0.1 to 2.0% by weight, based on the weight of the magnetic material of triethanolamine dioleate as the sole lubricant, and (b 4 ) a polymer of polyether-acrylate and (meth)acrylic acid as a dispersant.
Claim 3
Dependent Claim
27 words
The magnetic recording medium of claim 1, wherein the amount of lubricant is from 0.1 to 0.6% by weight based on the weight of the magnetic material.
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) | 1990-05-25 | 1990-11-24 | 1991-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-25 | 1994-11-24 | 1995-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-25 | 1998-11-24 | 1999-05-26 | $7700.00 | Window Closed / Lapsed |