Patent US4130671A successfully refreshed from Google Patents.
Patent US4018967A successfully refreshed from Google Patents.
US4018967A
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US
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Magnetic recording tape
Assignee: BASF SE
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Filing: 1974-09-19
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Granted: 1977-04-19
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Expires: 1994-09-19
Abstract
Abstract Magnetic recording tape especially suitable for use as video tape and computer tape, comprising a base carrying a magnetic coating which consists essentially of a dispersion of a finely divided magnetic pigment and at least one lubricant in an organic binder. The lubricant is a compound of the formula ##STR1## IN WHICH N IS AN INTEGER OF FROM 3 TO 8 AND R 1 and R 2 are an alkoxy or aralkoxy radical or conjointly are an alkyldioxy radical of 3 to 18 carbon atoms. A magnetic recording tape prepared with a high proportion of such a lubricant is distinguished by high abrasion resistance coupled with a minimum transfer of material to the magnetic heads even under fluctuating climatic conditions.
Inventors
- 👤 Hermann Roller
- 👤 Werner Senkpiel
- 👤 Gerd Wunsch
- 👤 Job-Werner Hartmann
- 👤 Friedrich Fuchs
- 👤 Joachim Hack
- 👤 Volker Kiener
- 👤 Herbert Motz
- 👤 Werner Ostertag
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:01
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/547; C07F9/6564; C07F9/6581; C07F9/65812; C07F9/65815; C08; C08K; C08K5/00; C08K5/49; C08K5/5399; 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; Y10T428/31551; Y10T428/31609
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
14 words
In a magnetic recording tape of the type comprising 1. a base; and 2.
Claim 2
Dependent Claim
14 words
In a magnetic recording tape of the type comprising 1. a base; and 2.
Claim 3
Dependent Claim
135 words
a magnetic coating carried on said base, said coating consisting essentially of a dispersion of a finely divided magnetic pigment and at least one lubricant in an organic binder, the improvement which comprises: using as a lubricant in said coating at least one compound of the formula (I) ##STR4## in which n is an integer of from 3 to 8, R' and R 2 are identical or different and are alkoxy or aralkoxy of 3 to 18 carbon atoms, alkoxy and aralkoxy substituted with bromine or chlorine or R' and R 2 conjointly are a --O--R 3 --0-- radical in which R 3 is a divalent aliphatic radical of 3 to 18 carbon atoms, wherein said compound of the Formula I constitutes from about 20 to about 100% by weight of the lubricant in the
Claim 4
Dependent Claim
135 words
a magnetic coating carried on said base, said coating consisting essentially of a dispersion of a finely divided magnetic pigment and at least one lubricant in an organic binder, the improvement which comprises: using as a lubricant in said coating at least one compound of the formula (I) ##STR4## in which n is an integer of from 3 to 8, R' and R 2 are identical or different and are alkoxy or aralkoxy of 3 to 18 carbon atoms, alkoxy and aralkoxy substituted with bromine or chlorine or R' and R 2 conjointly are a --O--R 3 --0-- radical in which R 3 is a divalent aliphatic radical of 3 to 18 carbon atoms, wherein said compound of the Formula I constitutes from about 20 to about 100% by weight of the lubricant in the
Claim 5
Dependent Claim
36 words
coating. 2. A magnetic recording tape as set forth in claim 1 wherein the lubricant present is a compound of the formula ##STR5## in which R is alkyl or aralkyl of 2 to 18 carbon atoms.
Claim 6
Dependent Claim
29 words
A magnetic recording tape as set forth in claim 1 wherein the lubricant present is a compound of the formula (III) ##STR6## in which X is chlorine or bromine.
Claim 7
Dependent Claim
26 words
A magnetic recording tape as set forth in claim 1 wherein at least 30 percent by weight of the binder employed is an elastomeric polyurethane binder.
Claim 8
Dependent Claim
16 words
A magnetic recording tape as set forth in claim 2 wherein R is an n-propyl group.
Claim 9
Dependent Claim
14 words
A magnetic recording tape as set forth in claim 3 wherein R is bromine.
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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) | 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 |