Claims
- 1. A magnetic recording medium comprising a non-magnetic substrate, and a magnetic layer provided on at least one surface of the substrate, and a lubricating agent comprising at least one alkylene oxide derivative having an alkylene oxide group and an ester moiety or an ammonium salt moiety, which is represented by the following general formula ( 2) or (4):
- R.sup.1 --O--(R.sup.2 O).sub.m --R.sup.3 --COONH.sub.3 --R.sup.4( 2)
- R.sup.4 --NH.sub.3 OCO--R.sup.3 --O--(R.sup.2 O).sub.m --R.sup.3 --COONH.sub.3 --R.sup.4 ( 4)
- wherein R.sup.1 is a hydrocarbon group having 1 to 26 carbon atoms or a hydrogen atom,
- R.sup.2 is a hydrocarbon group having 1 to 6 carbon atoms,
- R.sup.3 is a hydrocarbon group having 1 to 26 carbon atoms,
- R.sup.4 is a hydrocarbon or fluorocarbon group having 1 to 26 carbon atoms, and m is from 1 to 12, said lubricating agent being in or on the magnetic layer.
- 2. A magnetic recording medium comprising a non-magnetic substrate, a magnetic layer provided on at least one surface of the substrate, and a lubricating agent comprising:
- (A) at least one alkylene oxide derivative having an alkylene oxide group and an ester moiety or an ammonium salt moiety, which is represented by the following general formula (1), (2), (3) or (4):
- R.sup.1 --O--(R.sup.2 O).sub.m --R.sup.3 --COO-R.sup.4 ( 1)
- R.sup.1 --O--(R.sup.2 O).sub.m --R.sup.3 --COONH.sub.3 --R.sup.4( 2)
- R.sup.4 --OCO--R.sup.3 --O--(R.sup.2 O).sub.m --R.sup.3 --COO--R.sup.4( 3)
- R.sup.4 -NH.sub.3 OCO-R.sup.3 -O-(R.sup.2 O).sub.m -R.sup.3 -COONH.sub.3 --R.sup.4 ( 4)
- wherein R.sup.1 is a hydrocarbon group having 1 to 26 carbon atoms or a hydrogen atom,
- R.sup.2 is a hydrocarbon group having 1 to 6 carbon atoms,
- R.sup.3 is a hydrocarbon group having 1 to 26 carbon atoms,
- R.sup.4 is a hydrocarbon or fluorocarbon group having 1 to 26 carbon atoms, and m is from 1 to 12, and
- (B) at least one aliphatic amine represented by the following general formula (5):
- R.sup.5 N(R.sup.6)R.sup.7 ( 5)
- wherein R.sup.5 is a hydrocarbon group having 1 to 26 carbon atoms, and each of R.sup.6 and R.sup.7 is a hydrocarbon having 1 to 26 carbon atoms or a hydrogen atom, wherein said lubricating agent is in or on the magnetic layer.
- 3. The magnetic recording medium according to claim 1 or 2, wherein the magnetic recording medium is a ferromagnetic metal thin film-type magnetic recording medium and a coating weight of the lubricating agent is from 0.5 to 20 mg/m.sup.2.
- 4. The magnetic recording medium according to claim 3, further comprising a carbon, silicon oxide, zirconium oxide or chromium oxide protective film on a ferromagnetic metal thin film.
- 5. The magnetic recording medium according to claim 1 or 2, wherein the magnetic recording medium is a coating-type magnetic recording medium and an amount of the lubricating agent contained in the magnetic layer is from 10 to 100 mg/m.sup.2.
Priority Claims (1)
Number |
Date |
Country |
Kind |
7-254618 |
Sep 1995 |
JPX |
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Parent Case Info
This application is a divisional of application Ser. No. 08/708,542, filed on Sep. 5, 1996 now U.S. Pat. No. 5,759,968, the entire contents of which are hereby incorporated by reference.
US Referenced Citations (10)
Foreign Referenced Citations (5)
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2-210615 |
Aug 1990 |
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Non-Patent Literature Citations (1)
Entry |
Chemical Abstracts RN 139360-39-7 (Date unknown). |
Divisions (1)
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Number |
Date |
Country |
Parent |
708542 |
Sep 1996 |
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