Claims
- 1. A magnetic recording medium which comprises:
- (a) a non-magnetic substrate;
- (b) at least one magnetic substance layer formed on the non-magnetic substrate;
- (c) a protective layer formed on the magnetic substance layer which comprises at least one member selected from the group consisting of inorganic oxides, graphite and amorphous allotropes of carbon, and
- (d) a layer formed on the protective layer which comprises an ammonium carboxylate fluorine-containing compound having the formula,
- (R.sub.f --COO.sup.- H.sup.+).sub.n --R,
- wherein R.sub.f is a perfluoropolyoxyalkyl chain having a number average molecular weight of from 800 to 10,000, n is a number of 1-2, and R is a residue selected from the group consisting of
- (i) phenylammonium which may have one or more substituents selected from the group consisting of hydroxy, methyl, methoxy, nitro, chloro, hydroxymethyl, benzyl and phenoxy at the nucleus,
- (ii) benzylammonium which may have one or more substituents selected from the group consisting of hydroxy, methyl, methoxy, nitro, chloro, hydroxymethyl, benzyl and phenoxy at the nucleus,
- (iii) tribenzylammonium which may have one or more substituents selected from the group consisting of hydroxy, methyl, methoxy, nitro, chloro, hydroxymethyl, benzyl and phenoxy at the nucleus,
- (iv) pyridinium which may have one or more substituents selected from the group consisting of hydroxy, methyl, methoxy, nitro, chloro, hydroxymethyl, benzyl and phenoxy at the nucleus,
- (v) quinolinium which may have one or more substituents selected from the group consisting of hydroxy, methyl, methoxy, nitro, chloro, hydroxymethyl, benzyl and phenoxy at the nucleus,
- (vi) acridinium which may have one or more substituents selected from the group consisting of hydroxy, methyl, methoxy, nitro, chloro, hydroxymethyl, benzyl and phenoxy at the nucleus, ##STR14## wherein G is a bond selected from the group consisting of a direct single bond and --CO--, and Y and Z are independently a residue selected from the group consisting of hydrogen and --CH.sub.2 OH, ##STR15## said layer (d) having a thickness of not more than 30 nm.
- 2. The medium of claim 1, wherein R in the formula is phenylammonium which may have one or more substituents selected from the group consisting of nitro, methoxy, benzyl and phenoxy at the nucleus.
- 3. The medium of claim 1, wherein R in the formula is benzylammonium or 2,4-dichlorobenzylammonium.
- 4. The medium of claim 1, wherein R in the formula is tribenzylammonium.
- 5. The medium of claim 1, wherein R in the formula is pyridinium which may have one or more substituents selected from the group consisting of hydroxy, chloro and methoxy at the nucleus.
- 6. The medium of claim 1, wherein R in the formula is quinolinium which may have one or more substituents selected from the group consisting of nitro and methyl at the nucleus.
- 7. The medium of claim 1, wherein R in the formula is acridinium.
- 8. The medium of claim 1, wherein R in the formula is a residue having the formula, ##STR16##
- 9. The medium of claim 1, wherein R in the formula is a residue having the formula, ##STR17## wherein G is a bond selected from the group consisting of a direct single bond and --CO--, and Y and Z are independently a residue selected from the group consisting of hydrogen, and --CH.sub.2 OH.
- 10. The medium of claim 1, wherein R in the formula is a residue having the formula, ##STR18##
- 11. The medium of claim 1, wherein R in the formula is a residue having the formula, ##STR19##
- 12. The medium of claim 1, wherein R.sub.f in the formula has the repeating unit,
- --CF.sub.2 --CF.sub.2 --CF.sub.2 --O--.
- 13. The medium of claim 1, wherein R.sub.f in the formula is a perfluoropolyoxyalkyl chain represented by the following formula,
- (CF(CF.sub.3)--CF.sub.2 --O--).sub.d --CF(CF.sub.3)
- wherein d is an integer of 1 or more.
- 14. The medium of claim 1, wherein R.sub.f in the formula is a perfluoropolyoxyalkyl chain represented by the following formula,
- F(CF.sub.2 --CF.sub.2 --CF.sub.2 --O).sub.g --CF.sub.2 --CF.sub.2 --,
- wherein g is an integer of 1 or more.
Priority Claims (1)
Number |
Date |
Country |
Kind |
3-318645 |
Nov 1991 |
JPX |
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Parent Case Info
This application is a Continuation application of application Ser. No. 972,816, filed Nov. 6, 1992, now abandoned.
US Referenced Citations (8)
Continuations (1)
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Number |
Date |
Country |
Parent |
972816 |
Nov 1992 |
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