WO1994021758A1 - Lubricant and magnetic recording medium containing the same - Google Patents
Lubricant and magnetic recording medium containing the same Download PDFInfo
- Publication number
- WO1994021758A1 WO1994021758A1 PCT/JP1993/000352 JP9300352W WO9421758A1 WO 1994021758 A1 WO1994021758 A1 WO 1994021758A1 JP 9300352 W JP9300352 W JP 9300352W WO 9421758 A1 WO9421758 A1 WO 9421758A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- perfluoropolyether
- alkyl group
- lubricant
- chain
- recording medium
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M107/00—Lubricating compositions characterised by the base-material being a macromolecular compound
- C10M107/38—Lubricating compositions characterised by the base-material being a macromolecular compound containing halogen
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/62—Record carriers characterised by the selection of the material
- G11B5/72—Protective coatings, e.g. anti-static or antifriction
- G11B5/725—Protective coatings, e.g. anti-static or antifriction containing a lubricant, e.g. organic compounds
- G11B5/7253—Fluorocarbon lubricant
- G11B5/7257—Perfluoropolyether lubricant
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M105/00—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound
- C10M105/50—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound containing halogen
- C10M105/54—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound containing halogen containing carbon, hydrogen, halogen and oxygen
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/62—Record carriers characterised by the selection of the material
- G11B5/68—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent
- G11B5/70—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer
- G11B5/71—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the lubricant
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2211/00—Organic non-macromolecular compounds containing halogen as ingredients in lubricant compositions
- C10M2211/04—Organic non-macromolecular compounds containing halogen as ingredients in lubricant compositions containing carbon, hydrogen, halogen, and oxygen
- C10M2211/044—Acids; Salts or esters thereof
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2211/00—Organic non-macromolecular compounds containing halogen as ingredients in lubricant compositions
- C10M2211/06—Perfluorinated compounds
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2040/00—Specified use or application for which the lubricating composition is intended
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2040/00—Specified use or application for which the lubricating composition is intended
- C10N2040/14—Electric or magnetic purposes
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2040/00—Specified use or application for which the lubricating composition is intended
- C10N2040/14—Electric or magnetic purposes
- C10N2040/16—Dielectric; Insulating oil or insulators
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2040/00—Specified use or application for which the lubricating composition is intended
- C10N2040/14—Electric or magnetic purposes
- C10N2040/17—Electric or magnetic purposes for electric contacts
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2040/00—Specified use or application for which the lubricating composition is intended
- C10N2040/14—Electric or magnetic purposes
- C10N2040/175—Pantographs, i.e. printing devices
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2040/00—Specified use or application for which the lubricating composition is intended
- C10N2040/14—Electric or magnetic purposes
- C10N2040/18—Electric or magnetic purposes in connection with recordings on magnetic tape or disc
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2040/00—Specified use or application for which the lubricating composition is intended
- C10N2040/14—Electric or magnetic purposes
- C10N2040/185—Magnetic fluids
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2040/00—Specified use or application for which the lubricating composition is intended
- C10N2040/30—Refrigerators lubricants or compressors lubricants
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2040/00—Specified use or application for which the lubricating composition is intended
- C10N2040/32—Wires, ropes or cables lubricants
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2040/00—Specified use or application for which the lubricating composition is intended
- C10N2040/34—Lubricating-sealants
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2040/00—Specified use or application for which the lubricating composition is intended
- C10N2040/36—Release agents or mold release agents
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2040/00—Specified use or application for which the lubricating composition is intended
- C10N2040/38—Conveyors or chain belts
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2040/00—Specified use or application for which the lubricating composition is intended
- C10N2040/40—Generators or electric motors in oil or gas winning field
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2040/00—Specified use or application for which the lubricating composition is intended
- C10N2040/42—Flashing oils or marking oils
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2040/00—Specified use or application for which the lubricating composition is intended
- C10N2040/44—Super vacuum or supercritical use
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2040/00—Specified use or application for which the lubricating composition is intended
- C10N2040/50—Medical uses
Definitions
- the present invention relates to a lubricant in a magnetic recording medium such as a magnetic tape and a magnetic disk, and a magnetic recording medium using the same.
- Background technology For example, in a so-called metal magnetic thin film type magnetic recording medium in which a ferromagnetic metal material is deposited on the surface of a non-magnetic Since the smoothness is extremely good, the substantial contact area with a sliding member such as a magnetic head / guide roller is large, so that the friction coefficient is large and an adhesion phenomenon (so-called sticking) is likely to occur. There are many problems such as lack of durability.
- lubricants used for magnetic recording media are required to have extremely strict properties due to their properties, and it is difficult for conventional lubricants to cope with the situation.
- lubricants used for magnetic recording media include: (1) It has excellent low-temperature characteristics so that a predetermined lubricating effect is ensured when used in cold regions.
- the present invention provides a lubricant that exhibits excellent lubricity under various conditions of use, and a magnetic recording medium that is excellent in running properties, wear resistance, durability, and the like. It is intended for.
- the present inventors have conducted intensive studies to achieve the above-mentioned object, and as a result, have found that perfluoropolyether having a hydroxyl group at a terminal and a long-chain carboxy group.
- An ester compound of a carboxylic acid having a carboxylic acid or a fluorinated alkyl group or an ester compound of a perfluoropolyether having a carboxyl group at a terminal and a long-chain alcohol or an alcohol having a fluorinated alkyl group is used as a lubricant. It has been found that the use of such a material provides an excellent lubricating effect, and the present invention has been completed.
- the lubricant according to the first to fourth inventions of the present application is an ester compound of a perfluoropolyether having a hydroxyl group at a terminal and a carboxylic acid having a long-chain carboxylic acid or a fluorinated alkyl group, It is characterized by comprising an ester compound of a perfluoropolyether having a carboxyl group at a terminal and a long-chain alcohol or an alcohol having an alkyl oxy group.
- the magnetic recording medium according to the fifth to eighth inventions of the present application is a magnetic recording medium having at least a magnetic layer on a non-magnetic support, wherein the magnetic recording medium has the first to It is characterized by holding the lubricant according to the fourth invention.
- FIG. 1 is a characteristic diagram showing an infrared absorption spectrum of an example of a lubricant to which the present invention is applied.
- FIG. 2 is a characteristic diagram showing an infrared absorption spectrum of another example of the lubricant to which the present invention is applied.
- BEST MODE FOR CARRYING OUT THE INVENTION an ester compound of a perfluoropolyether having a terminal hydroxyl group and a long-chain carboxylic acid is, for example, a perfluoropolyether having a terminal hydroxyl group. It is obtained by reacting with carboxylic acid chloride base as a catalyst.
- the perfluoropolyether having a hydroxyl group at the terminal used in the synthesis of the ester compound includes those having a hydroxyl group at at least one terminal (one terminal) (monofunctional perfluoropolyether). Or a compound having hydroxyl groups at both ends (polyfunctional perfluoropolyether), and can be used irrespective of the substitution position.
- a monofunctional perfluoropolyether examples thereof include those represented by the following formulas (1) and (2), and multifunctional perfluoropolyethers include those represented by the following formula (3)
- the present invention is not limited to these.
- the molecular weight of the perfluoropolyether having a hydroxyl group at its terminal is not particularly limited, but practically preferably about 600 to 500,000. If the molecular weight is too large, the effect of the end group as an adsorbing group is diminished, and at the same time, the amount of CFC used increases as the perfluoropolyether chain becomes larger. Conversely, if the molecular weight is too small, the lubricating effect of the perfluoropolyether chain will be lost.
- the perfluoropolyether chain may be partially hydrogenated. That is, part of the fluorine atoms in the perfluoropolyether chain (50 % Or less) may be replaced by a hydrogen atom.
- a partially hydrogenated perfluoropolyether may be used as the perfluoropolyether, which makes it possible to reduce the amount of the fluorocarbon solvent used.
- carboxylic acid chloride base any of commercial products and synthetic products can be used.
- ester compound of perfluoropolyester having a hydroxyl group at the terminal and a long-chain carboxylic acid synthesized in this manner is represented by the following general formula (4) or (5).
- R f represents a perfluoroboryl ether chain.
- R represents an alkyl group.
- the structure and the like of the long-chain carboxylic acid are arbitrary, and can be selected regardless of the presence or absence of a branched structure, an isomer structure, an alicyclic structure, and an unsaturated bond.
- the molecular weight is also optional, but it is preferable that the alkyl group has at least 10 or more carbon atoms since the smaller the molecular weight, the more difficult it is to dissolve in an organic solvent other than chlorofluorocarbon.
- an ester compound of a perfluoropolyether having a carboxyl group at a terminal and a long-chain alcohol is, for example, a perfluoropolyether having a carboxyl group at a terminal and a long-chain alcohol. It is obtained by reacting a chain alcohol with anhydrous toluene using, for example, P-toluenesulfonic acid or concentrated sulfuric acid as a catalyst.
- a monofunctional perfluoropolyether may be used, or a polyfunctional perfluoropolyether may be used. Further, it can be used regardless of the substitution position.
- examples of the monofunctional perfluoropolyether include those represented by the following formulas (6) to (7). Examples include, but are not limited to, those represented by the following formula (8).
- the molecular weight of the perfluoropolyether having a carboxyl group at the terminal is not particularly limited, but is practically preferably about 600 to 500,000. If the molecular weight is too large, the effect of the terminal group as an adsorbing group is diminished and, at the same time, the amount of fluorocarbon used increases as the perfluoropolyether chain becomes larger. Conversely, if the molecular weight is too small, the lubricating effect of the perfluoropolyether chain will be lost.
- the perfluoropolyether chain may be partially hydrogenated as in the case of the first invention of the present application described above.
- the long-chain alcohol any of commercially available products or synthetic products can be used.
- the number of carbon atoms of at least one alkyl group is 6 or more, because the smaller the molecular weight, the more difficult it becomes to dissolve in an organic solvent other than furon.
- ester compound of the perfluorinated polyether having a terminal carboxyl group and the long-chain alcohol thus synthesized is represented by the following general formula (9) or (10).
- R f represents a perfluoropolyether chain.
- R represents an alkyl group.
- the structure of the alkyl group R is arbitrary, and can be selected irrespective of the presence of a branched structure, an isomer structure, an alicyclic structure, or an unsaturated bond.
- the molecular weight is also arbitrary, the carbon number is preferably 6 or more in consideration of solubility in organic solvents other than chlorofluorocarbon.
- the ester compound of a perfluoropolyether having a hydroxyl group at a terminal and a carboxylic acid having an alkyl fluoride group is, for example, a perfluoropolyether having a hydroxyl group at a terminal. Yusuke and, a fluorinated alkyl group of a hydroxyl group and an equimolar amount included in ⁇ Pa one Furuoropo Rie one ether ether (f -CH 2 0H R f - - CH 2 0H or H0CH 2) It is obtained by mixing with the corresponding acid chloride (RC0C1) derived from carboxylic acid (RC00H).
- perfluoropolyether having a hydroxyl group at the terminal used in synthesizing the ester compound a monofunctional perfluoropolyether or a polyfunctional perfluoropolyether may be used. , And can be used regardless of the substitution position.
- examples of the monofunctional perfluoropolyether include those represented by the following formulas (13) to (15). Examples include, but are not limited to, those represented by the following formulas (16) to (18).
- the molecular weight of the perfluoropolyether having a hydroxyl group at its terminal is not particularly limited, but is practically preferably about 600 to 500,000. If the molecular weight is too large, the effect of the terminal group as an adsorbing group is diminished, and at the same time, the amount of CFC used increases due to the increase in the perfluoroboryl-ter chain. Conversely, if the molecular weight is too small, the lubricating effect of the perfluoropolyether chain will be lost.
- the perfluoropolyether chain may be partially hydrogenated as in the case of the first invention of the present application described above.
- R represents an alkyl fluoride group having 7 to 30 carbon atoms.
- the structure of the carboxylic acid having a fluorinated alkyl group is arbitrary, and can be selected irrespective of the presence or absence of a branched structure, a cyclic group, an aromatic ring, and an unsaturated bond.
- ester compound of perfluoropolyether having a carboxyl group at the terminal and carboxylic acid having a fluorinated alkyl group is represented by the following general formula (20) or (21). expressed.
- R represents perfluoroboryl ether ⁇ .
- R represents a fluorinated alkyl group.
- the ester compound of a perfluoropolyether having a carboxyl group at the terminal and an alcohol having an alkyl fluoride group may be, for example, a perfluoropolyether having a carboxyl group at the terminal.
- the perfluoropolyether having a carboxyl group at the terminal used in the synthesis of this ester compound may be a monofunctional perfluoropolyether, a polyfunctional perfluoropolyether, or a substitution thereof. Can be used regardless of position.
- examples of the monofunctional perfluoropolyether include those represented by the following formulas (24) to (26), and the like.
- examples include those represented by the following formulas (27) to (29), but are not limited thereto.
- the molecular weight of the perfluoropolyether having a carboxyl group at its terminal is not particularly limited, but practically preferably about 600 to 500,000. If the molecular weight is too large, the effect of the terminal group as an adsorbing group is diminished, and at the same time, the amount of CFC used increases as the perfluoropolyether chain becomes larger. Conversely, if the molecular weight is too small, the lubricating effect of the perfluoropolyether chain will be lost.
- the perfluoropolyether chain may be partially hydrogenated as in the case of the first invention of the present application described above.
- R represents an alkyl fluoride group having 7 to 30 carbon atoms.
- the structure of the alcohol having a fluorinated alkyl group is arbitrary, and can be selected regardless of the presence of a branched structure, a cyclic group, an aromatic ring, and an unsaturated bond.
- ester compound of a perfluoropolyether having a carboxyl group at the terminal and an alcohol having an alkyl fluoride group is represented by the following general formula (31) or (32): Represented by o R f -CH 2 0 C OR
- R f represents a perfluoropolyether chain.
- R represents a fluorinated alkyl group.
- the magnetic recording medium according to the fifth to eighth aspects of the present invention has the above-mentioned ester compound according to the fifth to eighth aspects of the present invention as a lubricant on the surface of the magnetic layer.
- the magnetic recording medium to which the present invention is applied is not particularly limited.
- the present invention particularly relates to a method in which a metal magnetic thin film is formed as a magnetic layer on a non-magnetic support surface by a method such as an evaporation method or a sputtering method.
- the present invention is effective when applied to a so-called metal magnetic thin film type magnetic recording medium formed by adhesion.
- the film configuration and the like are arbitrary, and for example, the configuration may be such that an underlayer is interposed between the nonmagnetic support and the magnetic layer.
- the types of the non-magnetic support, the metal magnetic thin film, and the like are not limited at all, and any conventionally known types can be used.
- non-magnetic supports include, for example, polyesters, polyolefins, cellulose derivatives, vinyl resins, polyimides, polyamides, and polycarbonates.
- Any of a polymer support formed of a tic material, a metal substrate made of an aluminum alloy, a titanium alloy, or the like, a ceramic substrate made of alumina glass, or the like, and a glass substrate can be used.
- a rigid substrate such as an A1 alloy plate or a glass plate
- an oxide film such as alumite treatment or a Ni-P film is formed on the substrate surface.
- the surface may be hardened.
- the shape of the non-magnetic support is not limited at all, and may be in any form such as a tape, a sheet, a drum and the like. Further, fine irregularities may be formed on the nonmagnetic support in order to control its surface properties.
- the above-mentioned metal magnetic thin film is formed as a continuous film by vacuum thin film forming technology such as plating, sputtering, and vacuum evaporation.
- metals such as Fe, Co, and Ni, and Co-Ni alloys , Co-Pt alloy, Co-Pt-Ni alloy, Fe-Co alloy, Fe-Ni alloy, Fe-Co-Ni alloy, Fe- Uses in-plane magnetization recording metal magnetic films and C0-Cr-based alloy thin films made of Ni-B-based alloys, Fe-Co-B-based alloys, Fe-Co-Ni-B-based alloys, etc. It is possible.
- a low-melting non-magnetic material such as Bi, Sb, Pb, Sn, Ga, In, Ge, Si, or Ti is previously placed on a nonmagnetic support.
- An underlayer is formed in advance, and a metal magnetic material is deposited or sputtered from the vertical direction to diffuse these low-melting non-magnetic materials into the metal magnetic thin film, eliminating orientation and ensuring in-plane isotropy.
- the coercivity may be improved.
- a rigid substrate (hard disk) is used as a constituent material of the nonmagnetic support as described above, for example, a carbon film, a diamond-like or amorphous carbon film, A hard protective film such as a chromium oxide film or a SiO 2 film may be formed.
- the method of retaining the lubricant according to the first to fourth aspects of the present invention may be performed by using a magnetic material such as a metal magnetic thin film.
- a method of top-coating a lubricant layer on the surface of the layer or the surface of the protective film may be used.
- the amount of the lubricant used is preferably 0.5 to 100 mg Zm 2 , and more preferably 1 to 20 mg / m 2 .
- the ester compound used as a lubricant in the present invention may be used alone as a lubricant for a magnetic recording medium, or may be used in combination with a conventionally known lubricant.
- an extreme pressure agent may be used in combination at a weight ratio of about 30:70 to 70:30.
- This extreme pressure agent acts to prevent friction and wear by forming a reaction product film by reacting with the metal surface due to the frictional heat generated when partial metal contact occurs in the boundary lubrication region.
- any of a phosphorus-based extreme pressure agent, a sulfur-based extreme pressure agent, a halogen-based extreme pressure agent, an organometallic extreme pressure agent, and a composite extreme pressure agent can be used.
- a fire retardant may be used in combination.
- any one which is generally used as a protective agent for this type of magnetic recording medium can be used, for example, phenols, naphthols, quinones, heterocyclic compounds containing a nitrogen atom, Examples include a heterocyclic compound containing an oxygen atom and a heterocyclic compound containing a sulfur atom.
- a back coat layer, an undercoat layer, and the like may be formed as necessary in addition to the metal magnetic thin film as the magnetic layer.
- the back coat layer is a so-called coating type magnetic recording medium. It is obtained by adding a carbon-based fine powder for imparting conductivity, an inorganic pigment for controlling surface roughness, etc. to the same resin binder as the magnetic coating film used, and applying and forming this.
- the back coat layer may contain a lubricant composed of the above ester compound internally or by a top coat.
- the magnetic coating film, the metal magnetic thin film, the back coat layer and the like may be internally added with a lubricant composed of the above ester compound or may be top coated, and various combinations are possible. is there.
- a lubricant composed of the above ester compound or may be top coated, and various combinations are possible. is there.
- specific examples of the present invention will be described. However, needless to say, the present invention is not limited to these examples.
- ester compounds of a perfluoropolyether having a hydroxyl group at the end and a long-chain carboxylic acid was used as a lubricant, and the lubricant was applied to the surface of the magnetic layer, so-called a metal magnetic thin film type.
- the durability and running properties of the magnetic tape under various use conditions were examined. Synthesis of ester compounds
- 2 9 2 0 (: 111- 1 and 2 8 5 0 (: 111 _ 1 (: - ⁇ together with the stretching vibration appears one binding, to 1 7 6 5 c m-1 stretching vibration of the carbonyl group, also 1 3 5 0 stretching vibration of over c-F bond from c m-1 in 1 0 0 0 cm 1 appear respectively, whereas 3 6 9 0 cn 1 hydroxyl group from the absorption near disappearance since you are, the stearic phosphate ester of the compound 1 Pafuru Oroporieteru C 17 H 36 C00CH 2 CF 2 (0C 2 F 4) P (0CF 2) q0CF 2 CH 2 0C0C 17 H 35 ( however, p, q Represents an integer of 1 or more, respectively.
- ester compounds (compounds 2 to 14) of various perfluoropolyesters having hydroxyl groups at both ends and long-chain carboxylic acid as shown in Table 1 below in the same manner as in the above compound 1 ) was synthesized.
- Table 1 below in the same manner as in the above compound 1 ) was synthesized.
- p, q, 1, m, and n each represent an integer of 1 or more.
- the obtained magnetic tape was cut into 8 mm width to obtain sample tapes 1 to 14.
- the perfluoropolyether and stearyl alcohol in a molar ratio twice as much as that of this perfluoropolyether were heated to reflux in anhydrous toluene using a small amount of p-toluenesulfonic acid and concentrated sulfuric acid as catalysts.
- the reaction was carried out while removing generated water ( after the reaction was completed, toluene was removed, and the obtained compound was purified using silica gel column chromatography).
- ester compounds of various perfluoropolyethers having carboxyl groups at both terminals and long-chain alcohols as shown in Table 6 below (compounds 16 to 28) in the same manner as in the above compound 15 ) was synthesized.
- Table 6 p, q, 1, m, and n each represent an integer of 1 or more.
- sample tapes 15 to 28 were prepared in the same manner as in Experiment 1 except that the compounds 15 to 28 synthesized as described above were used as a lubricant.
- ester compounds First, a perfluoropolyether having a hydroxyl group at a terminal and a corresponding acid chloride derived from a carboxylic acid having an equimolar amount of a hydroxyl group and a hydroxyl group contained in the perfluoropolyether are used. By mixing, various ester compounds (compounds 29 to 38) as shown in Table 11 below were synthesized. In Table 11, 1, m, and n represent positive integers, respectively.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Emergency Medicine (AREA)
- Lubricants (AREA)
- Magnetic Record Carriers (AREA)
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4200130A JPH05194970A (ja) | 1991-07-10 | 1992-07-06 | 潤滑剤及びそれを用いた磁気記録媒体 |
JP4210215A JPH05194971A (ja) | 1991-08-07 | 1992-08-06 | 潤滑剤及びその潤滑剤を保有する磁気記録媒体 |
EP93906816A EP0643125A4 (en) | 1992-07-06 | 1993-03-24 | LUBRICANTS AND SUCH CONTAINING MAGNETIC RECORDING MEDIA. |
PCT/JP1993/000352 WO1994021758A1 (en) | 1992-07-06 | 1993-03-24 | Lubricant and magnetic recording medium containing the same |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4200130A JPH05194970A (ja) | 1991-07-10 | 1992-07-06 | 潤滑剤及びそれを用いた磁気記録媒体 |
JP4210215A JPH05194971A (ja) | 1991-08-07 | 1992-08-06 | 潤滑剤及びその潤滑剤を保有する磁気記録媒体 |
PCT/JP1993/000352 WO1994021758A1 (en) | 1992-07-06 | 1993-03-24 | Lubricant and magnetic recording medium containing the same |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1994021758A1 true WO1994021758A1 (en) | 1994-09-29 |
Family
ID=27307173
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1993/000352 WO1994021758A1 (en) | 1991-07-10 | 1993-03-24 | Lubricant and magnetic recording medium containing the same |
Country Status (1)
Country | Link |
---|---|
WO (1) | WO1994021758A1 (ja) |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS56124127A (en) * | 1979-01-08 | 1981-09-29 | Minnesota Mining & Mfg | Magnetic recording medium |
JPS62161744A (ja) * | 1986-01-09 | 1987-07-17 | Sony Corp | カルボン酸パ−フルオロアルキルエステル誘導体及びカルボン酸パ−フルオロアルキルエステル誘導体を含有する潤滑剤 |
JPS62226422A (ja) * | 1986-03-28 | 1987-10-05 | Sony Corp | 磁気記録媒体 |
JPS62226421A (ja) * | 1986-03-28 | 1987-10-05 | Sony Corp | 磁気記録媒体 |
JPS62270019A (ja) * | 1986-03-27 | 1987-11-24 | アウシモント・ソチエタ・ペル・アツイオニ | 磁気記録媒体用ペルフルオロポリエ−テル内部滑剤 |
JPH01211216A (ja) * | 1988-02-17 | 1989-08-24 | Seiko Epson Corp | 磁気記憶体 |
JPH01268664A (ja) * | 1988-04-19 | 1989-10-26 | Daikin Ind Ltd | 含フッ素ポリエーテル及び含フッ素潤滑剤 |
JPH01302529A (ja) * | 1987-12-07 | 1989-12-06 | Hitachi Maxell Ltd | 磁気記録媒体およびその製造方法 |
JPH037798A (ja) * | 1989-06-05 | 1991-01-14 | Asahi Chem Ind Co Ltd | 冷凍機用潤滑油 |
-
1993
- 1993-03-24 WO PCT/JP1993/000352 patent/WO1994021758A1/ja not_active Application Discontinuation
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS56124127A (en) * | 1979-01-08 | 1981-09-29 | Minnesota Mining & Mfg | Magnetic recording medium |
JPS62161744A (ja) * | 1986-01-09 | 1987-07-17 | Sony Corp | カルボン酸パ−フルオロアルキルエステル誘導体及びカルボン酸パ−フルオロアルキルエステル誘導体を含有する潤滑剤 |
JPS62270019A (ja) * | 1986-03-27 | 1987-11-24 | アウシモント・ソチエタ・ペル・アツイオニ | 磁気記録媒体用ペルフルオロポリエ−テル内部滑剤 |
JPS62226422A (ja) * | 1986-03-28 | 1987-10-05 | Sony Corp | 磁気記録媒体 |
JPS62226421A (ja) * | 1986-03-28 | 1987-10-05 | Sony Corp | 磁気記録媒体 |
JPH01302529A (ja) * | 1987-12-07 | 1989-12-06 | Hitachi Maxell Ltd | 磁気記録媒体およびその製造方法 |
JPH01211216A (ja) * | 1988-02-17 | 1989-08-24 | Seiko Epson Corp | 磁気記憶体 |
JPH01268664A (ja) * | 1988-04-19 | 1989-10-26 | Daikin Ind Ltd | 含フッ素ポリエーテル及び含フッ素潤滑剤 |
JPH037798A (ja) * | 1989-06-05 | 1991-01-14 | Asahi Chem Ind Co Ltd | 冷凍機用潤滑油 |
Non-Patent Citations (1)
Title |
---|
See also references of EP0643125A4 * |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP3240654B2 (ja) | パーフルオロポリエーテル誘導体及びこれを用いた潤滑剤並びに磁気記録媒体 | |
JP6042781B2 (ja) | 潤滑剤及び磁気記録媒体 | |
JPH06145687A (ja) | 潤滑剤及びその潤滑剤を保有する磁気記録媒体 | |
JP3463713B2 (ja) | 潤滑剤及び磁気記録媒体 | |
WO1999003954A1 (fr) | Composition lubrifiante, support d'enregistrement magnétique et procédé de production d'un support d'enregistrement magnétique | |
WO1994021758A1 (en) | Lubricant and magnetic recording medium containing the same | |
JPH05194970A (ja) | 潤滑剤及びそれを用いた磁気記録媒体 | |
EP0643125A1 (en) | Lubricant and magnetic recording medium containing the same | |
JP2005139429A (ja) | 潤滑剤、記録媒体、及びカルボン酸系化合物 | |
JP2003113389A (ja) | パーフルオロポリエーテル系化合物を含有する潤滑剤、および該潤滑剤を用いた磁気記録媒体。 | |
JPH0762377A (ja) | 潤滑剤及び磁気記録媒体 | |
JP2005120146A (ja) | 潤滑剤及び記録媒体 | |
JP3154232B2 (ja) | 磁気記録媒体 | |
JPH1053781A (ja) | 潤滑剤の製造方法 | |
JPH05347020A (ja) | 潤滑剤及びそれを用いた磁気記録媒体 | |
JPH0520675A (ja) | 磁気記録媒体 | |
JPH064855A (ja) | 磁気記録媒体 | |
JPH0641564A (ja) | 潤滑剤及びその潤滑剤を保有する磁気記録媒体 | |
JPH0684165A (ja) | 磁気記録媒体 | |
JP3941451B2 (ja) | パーフルオロポリアルキルエーテル系化合物、該化合物からなる潤滑剤および該潤滑剤を用いた記録媒体 | |
JPH05194971A (ja) | 潤滑剤及びその潤滑剤を保有する磁気記録媒体 | |
JPH05210840A (ja) | 磁気記録媒体 | |
JP2004161633A (ja) | 含フッ素化合物および潤滑剤、ならびに磁気記録媒体およびその製造方法 | |
JP2002265593A (ja) | フルオロポリアルキルエーテル系化合物、該化合物からなる潤滑剤および該潤滑剤を用いた記録媒体 | |
JPH09104881A (ja) | 磁気記録媒体 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): US |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): DE FR GB |
|
WWE | Wipo information: entry into national phase |
Ref document number: 1993906816 Country of ref document: EP |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
ENP | Entry into the national phase |
Ref country code: US Ref document number: 1995 343565 Date of ref document: 19950213 Kind code of ref document: A Format of ref document f/p: F |
|
WWP | Wipo information: published in national office |
Ref document number: 1993906816 Country of ref document: EP |
|
WWW | Wipo information: withdrawn in national office |
Ref document number: 1993906816 Country of ref document: EP |