US 6,143,413 AGranted

Magnetic recording medium and head cleaning tape

AssigneeSony Corporation

InventorsTakahiro Kamei, Noriyuki Kishii, Atsuko Suzuki, Haruo Watanabe, Ken Kobayashi, Kenichi Kurihara, Takahiro Miyazaki

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Abstract

This invention provides a magnetic recording medium which, even when the friction time is prolonged or the scan speed is increased to achieve a long time recording, will leave no burnt matters onto a magnetic head, reduce spacing loss, and prevent an increase in error rate. This invention also provides a cleaning tape which, without causing any wear and damage of a magnetic head, will remove the head of burnt matters adherent thereto. They are actually a magnetic recording medium and cleaning tape which hold an antiseize agent containing a compound with a pyridine skeleton and two or more ligand sites. Alternatively, they are a magnetic recording medium and cleaning tape which hold an antiseize agent containing a diketone compound. The antiseize agent may contain a titanium coupling agent, carboxylic acid, and phosphor-containing compound, in addition to the above compound.

Claims14

Dependent claims

A magnetic recording medium comprising:

a non-magnetic substrate,
a magnetic recording layer comprising a ferromagnetic thin film and a carbon film formed thereon, and a thin layer formed on the carbon film, the thin layer comprising a compound with a pyridine skeleton and two or more ligand sites, the compound being selected from the group consisting of:
##STR54## wherein R.sup.1 -R.sup.4 are selected from the group consisting of hydrogen, a halogen atom, and hydroxyl, nitro, carboxyl, carbonyl, amino, amide, and sulfonate groups, and alkyl, aryl and heterocyclic aromatic groups which have been substituted with the foregoing groups, and wherein any pair of two adjacent groups can form together an aromatic ring, and wherein X is selected from the group consisting of hydroxime, Schiff base, ester, carboxylic acid, alcohol, amine, amide, imide and polar groups comprising heterocyclic aromatic compounds;
##STR55## wherein R.sup.5 -R.sup.10 are selected from the group consisting of hydrogen, a halogen atom, and hydroxyl, nitro, carboxyl, carbonyl, amino, amide, and sulfonate groups, and alkyl, aryl and heterocyclic aromatic groups which have been substituted with the foregoing groups, and wherein any pair of two adjacent groups can form an aromatic ring, and Y is selected from the group consisting of OH, SH and NH.sub.2 ;
##STR56## wherein R.sup.11 -R.sup.18 are selected from the group consisting of hydrogen, a halogen atom, and hydroxyl, nitro, carboxyl, carbonyl, amino, amide, and sulfonate groups, and alkyl, aryl and heterocyclic aromatic groups which have been substituted with the foregoing groups, and wherein any pair of two adjacent groups can form an aromatic ring;
and ##STR57## wherein R.sup.19 -R.sup.26 are selected from the group consisting of hydrogen, a halogen atom, and hydroxyl, nitro, carboxyl, carbonyl, amino, amide, and sulfonate groups, and alkyl, aryl and heterocyclic aromatic groups which have been substituted with the foregoing groups, and wherein any pair of two adjacent groups can form an aromatic ring;
and
wherein said compound exists in a free state and is not bound to the magnetic recording layer.

5 more elements

A magnetic recording medium comprising:

a non-magnetic substrate,
a magnetic recording layer comprising a ferromagnetic thin film and a carbon film formed thereon, and a first layer formed on the carbon film, the first layer comprising a titanate coupling agent or a carboxyl acid, and a second layer formed on the first layer, the second layer comprising a compound with a pyridine skeleton and two or more ligand sites, the compound being selected from the group consisting of:
##STR58## wherein R.sup.1 -R.sup.4 are selected from the group consisting of hydrogen, a halogen atom, and hydroxyl, nitro, carboxyl, carbonyl, amino, amide, and sulfonate groups, and alkyl, aryl and heterocyclic aromatic groups which have been substituted with the foregoing groups, and wherein any pair of two adjacent groups can form together an aromatic ring, and wherein X is selected from the group consisting of hydroxime, Schiff base, ester, carboxylic acid, alcohol, amine, amide, imide and polar groups comprising heterocyclic aromatic compounds;
##STR59## wherein R.sup.5 -R.sup.10 are selected from the group consisting of hydrogen, a halogen atom, and hydroxyl, nitro, carboxyl, carbonyl, amino, amide, and sulfonate groups, and alkyl, aryl and heterocyclic aromatic groups which have been substituted with the foregoing groups, and wherein any pair of two adjacent groups can form an aromatic ring, and Y is selected from the group consisting of OH, SH and NH.sub.2 ;
##STR60## wherein R.sup.11 -R.sup.18 are selected from the group consisting of hydrogen, a halogen atom, and hydroxyl, nitro, carboxyl, carbonyl, amino, amide, and sulfonate groups, and alkyl, aryl and heterocyclic aromatic groups which have been substituted with the foregoing groups, and wherein any pair of two adjacent groups can form an aromatic ring;
and ##STR61## wherein R.sup.19 -R.sup.26 are selected from the group consisting of hydrogen, a halogen atom, and hydroxyl, nitro, carboxyl, carbonyl, amino, amide, and sulfonate groups, and alkyl, aryl and heterocyclic aromatic groups which have been substituted with the foregoing groups, and wherein any pair of two adjacent groups can form an aromatic ring;
and
wherein said compound exists in a free state and is not bound to the magnetic recording layer.

5 more elements

A magnetic recording medium comprising:

a non-magnetic substrate, and
a magnetic recording layer comprising ferromagnetic particles and a binder, said magnetic recording layer comprising a carboxylic acid which adsorbs said ferromagnetic particles and a compound comprising a pyridine skeleton and two or more ligand sites, the compound being selected from the group consisting of:
##STR62## wherein R.sup.1 -R.sup.4 are selected from the group consisting of hydrogen, a halogen atom, and hydroxyl, nitro, carboxyl, carbonyl, amino, amide, and sulfonate groups, and alkyl, aryl and heterocyclic aromatic groups which have been substituted with the foregoing groups, and wherein any pair of two adjacent groups can form together an aromatic ring, and wherein X is selected from the group consisting of hydroxime, Schiff base, ester, carboxylic acid, alcohol, amine, amide, imide and polar groups comprising heterocyclic aromatic compounds;
##STR63## wherein R.sup.5 -R.sup.10 are selected from the group consisting of hydrogen, a halogen atom, and hydroxyl, nitro, carboxyl, carbonyl, amino, amide, and sulfonate groups, and alkyl, aryl and heterocyclic aromatic groups which have been substituted with the foregoing groups, and wherein any pair of two adjacent groups can form an aromatic ring, and Y is selected from the group consisting of OH, SH and NH.sub.2 ;
##STR64## wherein R.sup.11 -R.sup.18 are selected from the group consisting of hydrogen, a halogen atom, and hydroxyl, nitro, carboxyl, carbonyl, amino, amide, and sulfonate groups, and alkyl, aryl and heterocyclic aromatic groups which have been substituted with the foregoing groups, and wherein any pair of two adjacent groups can form an aromatic ring;
and ##STR65## wherein R.sup.19 -R.sup.26 are selected from the group consisting of hydrogen, a halogen atom, and hydroxyl, nitro, carboxyl, carbonyl, amino, amide, and sulfonate groups, and alkyl, aryl and heterocyclic aromatic groups which have been substituted with the foregoing groups, and wherein any pair of two adjacent groups can form an aromatic ring;
and
wherein said compound exists in a free state and is not bound to the magnetic recording layer.

5 more elements

A magnetic recording medium comprising:

a non-magnetic substrate, and
a magnetic recording layer comprising ferromagnetic particles and a binder, said magnetic recording layer comprising a titanate coupling agent which adsorbs said ferromagnetic particles and a compound comprising a pyridine skeleton and two or more ligand sites, the compound being selected from the group consisting of:
##STR66## wherein R.sup.1 -R.sup.4 are selected from the group consisting of hydrogen, a halogen atom, and hydroxyl, nitro, carboxyl, carbonyl, amino, amide, and sulfonate groups, and alkyl, aryl and heterocyclic aromatic groups which have been substituted with the foregoing groups, and wherein any pair of two adjacent groups can form together an aromatic ring, and wherein X is selected from the group consisting of hydroxime, Schiff base, ester, carboxylic acid, alcohol, amine, amide, imide and polar groups comprising heterocyclic aromatic compounds;
##STR67## wherein R.sup.5 -R.sup.10 are selected from the group consisting of hydrogen, a halogen atom, and hydroxyl, nitro, carboxyl, carbonyl, amino, amide, and sulfonate groups, and alkyl, aryl and heterocyclic aromatic groups which have been substituted with the foregoing groups, and wherein any pair of two adjacent groups can form an aromatic ring, and Y is selected from the group consisting of OH, SH and NH.sub.2 ;
##STR68## wherein R.sup.11 -R.sup.18 are selected from the group consisting of hydrogen, a halogen atom, and hydroxyl, nitro, carboxyl, carbonyl, amino, amide, and sulfonate groups, and alkyl, aryl and heterocyclic aromatic groups which have been substituted with the foregoing groups, and wherein any pair of two adjacent groups can form an aromatic ring;
and ##STR69## wherein R.sup.19 -R.sup.26 are selected from the group consisting of hydrogen, a halogen atom, and hydroxyl, nitro, carboxyl, carbonyl, amino, amide, and sulfonate groups, and alkyl, aryl and heterocyclic aromatic groups which have been substituted with the foregoing groups, and wherein any pair of two adjacent groups can form an aromatic ring;
and
wherein said compound exists in a free state and is not bound to the magnetic recording layer.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 08/921,220Filed 27 Aug 1997
Priority: JP 8-23105830 Aug 1996
Granted: 7 Nov 2000
Term ends: Not estimatedThe source records don’t support an estimate.

Classification9 codes

G11B 5/735
Base layers , i.e. all non-magnetic layers lying under a lowermost magnetic recording layer, e.g. including any non-magnetic layer in between a…:…
G11B 5/627
Record carriers characterised by the selection of the material: of leaders for magnetic tapes, e.g. non-magnetic strips on the tapes or for connection
G11B 5/7028
Characterised by the bonding agent: additives, e.g. crosslinking agents
G11B 5/72
Record carriers characterised by the selection of the material: protective coatings, e.g. anti-static or antifriction