US4018968A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coated magnetic recording media
Assignee: BASF SE
•
Filing: 1974-09-19
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Granted: 1977-04-19
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Expires: 1994-09-19
Abstract
Abstract Coated magnetic recording media, especially video tapes and computer tapes, comprising a non-magnetic base carrying a magnetic coating which consists of a dispersion, essentially containing a finely divided magnetic pigment in an organic binder and at least one lubricant. A compound of the formula ##STR1## in which n is an integer of from 1 to 3 and R is alkyl, alkoxyalkyl or aralkyl, each of 3 to 18 carbon atoms, is used as a lubricant. The products have high abrasion resistance coupled with only little transfer of material to the magnetic heads even under fluctuating climatic conditions.
Inventors
- 👤 Ute Neumann
- 👤 Hermann Roller
- 👤 Job-Werner Hartmann
- 👤 Joachim Hack
- 👤 Herbert Motz
- 👤 Werner Ostertag
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:34
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/71; C; C07; C07F; C07F9/00; C07F9/02; C07F9/06; C07F9/08; C07F9/09; C07F9/091; C08; C08K; C08K5/00; C08K5/49; C08K5/51; C08K5/52; C08K5/521; Y; Y10; Y10S; Y10S428/00; Y10S428/90
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
73 words
A coated magnetic recording medium comprising a base carrying a magnetic coating which consists essentially of a dispersion of a finely divided magnetic pigment and a lubricant in an organic binder, wherein the said lubricant contains 20 to 100% by weight of a compound of the formula (1) ##STR4## wherein n is an integer of from 1 to 30 and R is alkyl, alkoxyalkyl or aralkyl, each of 3 to 18 carbon atoms.
Claim 2
Dependent Claim
73 words
A coated magnetic recording medium comprising a base carrying a magnetic coating which consists essentially of a dispersion of a finely divided magnetic pigment and a lubricant in an organic binder, wherein the said lubricant contains 20 to 100% by weight of a compound of the formula (1) ##STR4## wherein n is an integer of from 1 to 30 and R is alkyl, alkoxyalkyl or aralkyl, each of 3 to 18 carbon atoms.
Claim 3
Dependent Claim
29 words
A coated magnetic recording medium as claimed in claim 1, which contains a compound of the formula (I), in which each n is 1 and each R is alkyl.
Claim 4
Dependent Claim
20 words
A magnetic recording medium as claimed in claim 2, wherein the lubricant present is a compound of the formula ##STR5##
Claim 5
Dependent Claim
28 words
A magnetic recording medium as claimed in claim 1, which contains from 0.1 to 20 percent by weight of the lubricants, based on the amount of magnetic pigment.
Claim 6
Dependent Claim
28 words
A magnetic recording medium as claimed in claim 1, which contains from 0.4 to 2 percent by weight of the lubricants, based on the amount of magnetic pigment.
References Cited (Backward Citations)
US3719525A
Cited
US3692884A
Cited
US3704152A
Cited
US3778308A
Cited
US3778308B1
Cited
US3793074A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-04-18 | 1980-10-18 | 1981-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-18 | 1984-10-18 | 1985-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-18 | 1988-10-18 | 1989-04-19 | $7700.00 | Window Closed / Lapsed |