WO2016084781A1 - フルオロポリエーテル化合物、潤滑剤、磁気ディスクならびにその製造方法 - Google Patents
フルオロポリエーテル化合物、潤滑剤、磁気ディスクならびにその製造方法 Download PDFInfo
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- WO2016084781A1 WO2016084781A1 PCT/JP2015/082882 JP2015082882W WO2016084781A1 WO 2016084781 A1 WO2016084781 A1 WO 2016084781A1 JP 2015082882 W JP2015082882 W JP 2015082882W WO 2016084781 A1 WO2016084781 A1 WO 2016084781A1
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- 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
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C43/00—Ethers; Compounds having groups, groups or groups
- C07C43/02—Ethers
- C07C43/03—Ethers having all ether-oxygen atoms bound to acyclic carbon atoms
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C43/00—Ethers; Compounds having groups, groups or groups
- C07C43/02—Ethers
- C07C43/03—Ethers having all ether-oxygen atoms bound to acyclic carbon atoms
- C07C43/04—Saturated ethers
- C07C43/13—Saturated ethers containing hydroxy or O-metal groups
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C43/00—Ethers; Compounds having groups, groups or groups
- C07C43/02—Ethers
- C07C43/03—Ethers having all ether-oxygen atoms bound to acyclic carbon atoms
- C07C43/14—Unsaturated ethers
- C07C43/17—Unsaturated ethers containing halogen
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G65/00—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule
- C08G65/02—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring
- C08G65/32—Polymers modified by chemical after-treatment
- C08G65/329—Polymers modified by chemical after-treatment with organic compounds
- C08G65/331—Polymers modified by chemical after-treatment with organic compounds containing oxygen
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- 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
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- 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
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- 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
- G11B5/84—Processes or apparatus specially adapted for manufacturing record carriers
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- 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
- C10M2211/042—Alcohols; Ethers; Aldehydes; Ketones
- C10M2211/0425—Alcohols; Ethers; Aldehydes; Ketones used as base material
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- 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
- C10M2213/00—Organic macromolecular compounds containing halogen as ingredients in lubricant compositions
- C10M2213/04—Organic macromolecular compounds containing halogen as ingredients in lubricant compositions obtained from monomers containing carbon, hydrogen, halogen and oxygen
- C10M2213/043—Organic macromolecular compounds containing halogen as ingredients in lubricant compositions obtained from monomers containing carbon, hydrogen, halogen and oxygen used as base material
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- 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
- C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
- C10N2030/06—Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure
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- 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
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- 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
- C10N2050/00—Form in which the lubricant is applied to the material being lubricated
- C10N2050/023—Multi-layer lubricant coatings
- C10N2050/025—Multi-layer lubricant coatings in the form of films or sheets
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- 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
- C10N2070/00—Specific manufacturing methods for lubricant compositions
Definitions
- the present invention relates to a fluoropolyether compound, a lubricant, a magnetic disk, and a method for producing the same.
- a carbon protective film and a lubricant film are provided on the surface of the magnetic disk for the purpose of suppressing friction when contacting or sliding with the head and preventing contamination of the magnetic disk surface. It is responsible for protecting the surface of the magnetic disk.
- the lubricating layer used on the outermost surface is required to have various properties such as long-term stability, chemical resistance, frictional properties, and heat resistance properties. Conventionally, a lot of fluoropolyether has been used as a lubricant for magnetic disks. (For example, Patent Documents 1 and 2).
- HAMR thermalally assisted magnetic recording
- Patent Documents 3 and 4 propose a technique for increasing the number of adsorption sites on a magnetic disk by introducing a hydroxyl group into the molecule.
- the coupling of the lubricant to the magnetic disk is still insufficient, and a lubricant capable of forming a stronger bond to the magnetic disk is desired.
- JP 2009-301709 A International Publication No. 2009/066784 JP 2006-070173 A JP 2010-086598 A
- An object of the present invention is to provide a fluoropolyether compound having excellent heat resistance, a lubricant, a magnetic disk, and a method for producing the same, which can maintain the lubricity of the surface of the magnetic disk without evaporating even at a high temperature by laser heating. Is to provide.
- the present invention relates to the fluoropolyether compounds shown in the following items 1 to 7.
- Item 1 A fluoropolyether compound in which an aliphatic hydrocarbon chain having 4 to 10 carbon atoms existing in the center of the molecule is ether-bonded to two or more perfluoropolyethers, The aliphatic hydrocarbon chain has one or more hydroxyl groups; The two or more perfluoropolyethers each have —OH, —OCH 2 CH (OH) CH 2 OH, —OCH 2 CH (OH) CH 2 OCH 2 CH (OH) at the end not on the hydrocarbon chain side.
- the fluoropolyether compound is HOCH 2 CH (OH) CH 2 OCH 2 CF 2 CF 2 O (CF 2 CF 2 CF 2 O) z CF 2 CF 2 CH 2 -OCH 2 CH (OH) CH 2 CH 2 CH 2 CH 2 CH (OH) CH 2 O—CH 2 CF 2 CF 2 O (CF 2 CF 2 CF 2 O) z CF 2 CF 2 CH 2 OCH 2 CH (OH) CH 2 OH, HOCH 2 CH (OH) CH 2 OCH 2 CF 2 CF 2 CF 2 O (CF 2 CF 2 CF 2 O) w CF 2 CF 2 CF 2 CH 2 -OCH 2 CH (OH) CH 2 CH 2 CH 2 CH 2 CH (OH) CH 2 O—CH 2 CF 2 CF 2 CF 2 O (CF 2 CF 2 CF 2 O) w CF 2 CF 2 CF 2 CH 2 OCH 2 CH (OH) CH 2 OH, HOCH 2 CF 2 CF 2 CF 2 O (CF 2
- the fluoropolyether compound according to Item 1 or 2 which is at least one selected from the group consisting of 2 CH 2 OH.
- Item 4. Item 4. The fluoropolyether compound according to Item 3, wherein z is a real number of 0 to 30, and w is a real number of 0 to 20.
- Item 5. A lubricant containing the fluoropolyether compound according to any one of items 1 to 4.
- Item 6. A magnetic disk having a recording layer, a protective layer, and a lubricating layer in this order on a support, 6.
- a magnetic disk wherein the lubricating layer is a layer formed by applying the lubricant according to the above item 5 on the surface of the protective layer and irradiating with ultraviolet rays or heat treatment.
- Item 7 A method of manufacturing a magnetic disk having a recording layer, a protective layer, and a lubricating layer in this order on a support, Manufacturing a magnetic disk, wherein a recording layer and a protective layer are formed in this order on a support, and the lubricant according to the above item 5 is applied to the surface of the protective layer, and the lubricating layer is formed by ultraviolet irradiation or heat treatment.
- the fluoropolyether compound of the present invention is present at the hydroxyl group of the aliphatic hydrocarbon chain having 4 to 10 carbon atoms present at the center of the molecule and at the terminal not on the hydrocarbon chain side of the perfluoropolyether.
- Polar groups can be bonded to the magnetic disk surface.
- the bonds between carbon atoms and oxygen atoms of the aliphatic hydrocarbon chain having 4 to 10 carbon atoms are broken by ultraviolet irradiation or heat treatment to form a strong bond with the magnetic disk surface. And the lubricity of the magnetic disk surface can be maintained.
- the lubricant containing the fluoropolyether compound of the present invention can maintain the lubricity of the magnetic disk surface even under high temperature by laser heating.
- the fluoropolyether compound of the present invention is a fluoropolyether compound in which an aliphatic hydrocarbon chain having 4 to 10 carbon atoms existing in the center of a molecule is ether-bonded to two or more perfluoropolyethers. There, The aliphatic hydrocarbon chain has one or more hydroxyl groups; The two or more perfluoropolyethers each have —OH, —OCH 2 CH (OH) CH 2 OH, —OCH 2 CH (OH) CH 2 OCH 2 CH (OH) at the end not on the hydrocarbon chain side.
- R 1 is hydrogen, carbon And at least one polar group selected from the group consisting of an alkoxy group, an amino group, or an amide residue of formulas 1 to 4.
- the aliphatic hydrocarbon chain present in the center of the molecule has 4 to 10 carbon atoms, preferably 4 to 8 carbon atoms, and 8 is particularly preferable. In the present invention, it is an important feature that the aliphatic hydrocarbon chain has 4 to 10 carbon atoms.
- irradiation with ultraviolet light or heat treatment causes cleavage between the carbon atom and the oxygen atom of the aliphatic hydrocarbon chain having 4 to 10 carbon atoms.
- the oxygen atom (O) on the perfluoropolyether side remaining after the CH 2 and / or cleavage can form a strong bond with the magnetic disk.
- the aliphatic hydrocarbon chain includes either a straight chain or a branched chain.
- each of both ends of the chain has a shape bonded to perfluoropolyether via an oxygen atom.
- both ends of the main chain and one or more branched ends can be ether-bonded to the perfluoropolyether. For example, if the number of branched chains is 1, three perfluoropolyethers can be ether-bonded, and if the number of branched chains is two, four perfluoropolyethers can be ether-bonded.
- perfluoropolyether a perfluoropolyether skeleton used in general magnetic disk lubricants can be used without limitation.
- the perfluoropolyether is, for example, —CH 2 (CF 2 ) p O (CF 2 O) x (CF 2 CF 2 O) y (CF 2 CF 2 CF 2 O) z (CF 2 CF 2 CF 2 CF 2 O) w (CF 2 ) p CH 2 — (x and y are each a real number from 0 to 30.
- z is a real number from 0 to 30.
- w is a real number from 0 to 20.
- p is from 1 to It is an integer of 3.
- x and y are each preferably a real number of 0 to 12, and more preferably a real number of 2 to 8.
- z is preferably a real number of 1 to 12, and more preferably a real number of 2 to 8.
- w is preferably a real number of 0 to 10, more preferably a real number of 1 to 5.
- w is a real number of 1 to 5, it is preferable because the molecular chain becomes flatter and the film thickness of the lubricant becomes thinner.
- p is an integer of 1 to 3.
- the end of the perfluoropolyether which is not on the hydrocarbon chain side is —OH, —OCH 2 CH (OH) CH 2 OH, —OCH 2 CH (OH) CH 2 OCH 2 CH (OH) CH 2 OH, —O ( CH 2 ) m OH or —OCH 2 (OH) CHCH 2 —OC 6 H 4 —R 1 (where m is an integer of 2 to 8.
- R 1 is hydrogen and an alkoxy group having 1 to 4 carbon atoms.
- polar groups are functional groups that interact with the magnetic disk surface, and are weakly bonded to the magnetic disk surface before ultraviolet irradiation or heat treatment, and form a strong bond with the magnetic disk surface by ultraviolet irradiation or heat treatment. be able to.
- the compound of the present invention is, for example, (a) a linear fluoropolyether having a hydroxyl group at one end and an alkoxy group having a hydroxyl group at the other end, or (b) a straight chain having a hydroxyl group at both ends. It is obtained by reacting a chain fluoropolyether with (A) an aliphatic hydrocarbon having two epoxy groups. Specifically, it can be synthesized by the following method.
- (B) A linear fluoropolyether having hydroxyl groups at both ends is reacted with (c) a compound that reacts with a hydroxyl group to form an alkoxy group having a hydroxyl group.
- the reaction temperature is 20 to 90 ° C, preferably 60 to 80 ° C.
- the reaction time is 5 to 20 hours, preferably 10 to 15 hours.
- the amount of the compound (c) used is preferably 0.5 to 1.5 equivalents relative to the fluoropolyether (b).
- purification by, for example, column chromatography is performed to obtain the fluoropolyether (a).
- the reaction can be performed in a solvent.
- reaction accelerator examples include basic compounds such as sodium, potassium t-butoxide, and sodium hydride.
- the fluoropolyether (b) is HOCH 2 — (CF 2 ) p O (CF 2 O) x (CF 2 CF 2 O) y (CF 2 CF 2 CF 2 O) z (CF 2 CF 2 CF 2 CF 2 O) w (CF 2 ) p —CH 2 OH
- x and y are each a real number from 0 to 30.
- z is a real number from 0 to 30.
- w is a real number from 0 to 20.
- p is It is an integer from 1 to 3.
- fluoropolyether (b) specifically, a compound represented by HOCH 2 CF 2 CF 2 CF 2 O (CF 2 CF 2 CF 2 O) w CF 2 CF 2 CF 2 CH 2 OH, HOCH 2 CF 2 O (CF 2 O ) x (CF 2 CF 2 O) a compound represented by y CF 2 CH 2 OH, HOCH 2 CF 2 CF 2 O (CF 2 CF 2 CF 2 O) z CF 2 CF 2 CH and the like compounds represented by 2 OH.
- the number average molecular weight of these fluoropolyethers is usually 300 to 4000, preferably 500 to 2000, more preferably 600 to 1500.
- the number average molecular weight is a value measured by 19 F-NMR using JNM-ECX400 manufactured by JEOL.
- NMR measurement the sample itself was used for measurement without diluting the sample into a solvent.
- the standard for chemical shift was substituted with a known peak that is part of the skeleton structure of the fluoropolyether.
- x and y are each a real number of 0 to 30, and preferably a real number of 0 to 12. When both x and y are real numbers of 0 to 12, it is preferable because the molecular chain becomes flatter and the lubricant film thickness becomes thinner.
- z is a real number from 0 to 30, preferably a real number from 1 to 12.
- z is a real number of 1 to 12, it is preferable because the molecular chain becomes flatter and the film thickness of the lubricant becomes thinner.
- w is a real number from 0 to 20, preferably a real number from 0 to 10. When w is a real number of 0 to 10, it is preferable because the molecular chain becomes flatter and the film thickness of the lubricant becomes thinner.
- p is an integer of 1 to 3.
- the fluoropolyether (b) has a molecular weight distribution.
- the molecular weight distribution (PD) represented by the weight average molecular weight / number average molecular weight of the fluoropolyether (b) is 1.0 to 1.5, preferably 1.0 to 1.3, more preferably It is 1.0 to 1.1.
- PD molecular weight distribution
- Tosoh HPLC-8220GPC is used, Polymer Laboratory column (PLgel Mixed E) is used, eluent is HCFC-based chlorofluorocarbon, and non-functional perfluoropolyether is used as a reference substance. Is the characteristic value obtained.
- Examples of the compound (c) include a compound having an epoxy group, a haloalkyl alcohol represented by X (CH 2 ) m OH, a phenoxy compound (c-1) having an epoxy group, and the like.
- Examples of the compound having an epoxy group include glycidol, propylene oxide, glycidyl methyl ether, and isobutylene oxide.
- haloalkyl alcohol represented by X (CH 2 ) m OH
- X is a halogen atom such as chlorine, bromine or iodine
- m is a real number of 2 to 8.
- haloalkyl alcohols include 2-chloroethanol, 3-chloropropanol, 4-chlorobutanol, 5-chloropentanol, 6-chlorohexanol, 7-chloroheptanol, 8-chlorooctanol, 2-bromoethanol, 3- Bromopropanol, 4-bromobutanol, 5-bromopentanol, 6-bromohexanol, 7-bromoheptanol, 8-bromooctanol, 2-iodoethanol, 3-iodopropanol, 4-iodobutanol, 5-iodopentanol , 6-iodohexanol, 7-iod
- the phenoxy compound (c-1) having an epoxy group has the following formula:
- R 4 examples include hydrogen, an alkoxy group having 1 to 4 carbon atoms, an amino group, an amide residue, and the like.
- Examples of the alkoxy group having 1 to 4 carbon atoms include methoxy, ethoxy, propoxy, butoxy and the like.
- Examples of the amino group include amino, methylamino, dimethylamino, ethylamino, diethylamino and the like.
- Examples of the amide residue include acetamide (—NHCOCH 3 ) and propionic acid amide (—NHCOC 2 H 5 ).
- the compound (c-1) include glycidyl 4-methoxyphenyl ether, glycidyl 4-ethoxyphenyl ether, glycidyl 4-propoxyphenyl ether, glycidyl 4-butoxyphenyl ether, glycidyl 4-aminophenyl ether, glycidyl 4 -Methylaminophenyl ether, glycidyl 4-dimethylaminophenyl ether, glycidyl 4-ethylaminophenyl ether, glycidyl 4-diethylaminophenyl ether, glycidyl 4-acetamidophenyl ether, glycidyl 4-propionic acid amide phenyl ether, etc. it can.
- HOCH 2 CF 2 O (CF 2 O) x (CF 2 CF 2 O) y CF 2 CH 2 OH is used as the fluoropolyether (b), and glycidyl 4-methoxyphenyl ether is used as the compound (c).
- the fluoropolyether (a) is CH 3 O—C 6 H 4 O—CH 2 CH (OH) CH 2 OCH 2 CF 2 O (CF 2 O) x (CF 2 CF 2 O) y CF 2 CH 2 OH is formed.
- the fluoropolyether (a) or the fluoropolyether (b) obtained in the first step is reacted with the aliphatic hydrocarbon (A) in the presence of a base.
- the reaction temperature is 20 to 90 ° C, preferably 60 to 80 ° C.
- the reaction time is 5 to 20 hours, preferably 10 to 15 hours. It is preferable to use 0.5 to 1.5 equivalents of the aliphatic hydrocarbon (A) and 0.5 to 2.0 equivalents of the base with respect to the fluoropolyether (a) or (b).
- Sodium t-butoxide, potassium t-butoxide, sodium hydroxide, potassium hydroxide, sodium hydride and the like can be used as the base.
- the reaction can be performed in a solvent.
- As the solvent t-butanol, toluene, xylene or the like can be used. Then, for example, it is washed with water and dehydrated. This gives the compounds of the invention.
- aliphatic hydrocarbon (A) examples include 1,3-butadiene diepoxide, 1,4-pentadiene diepoxide, 1,5-hexadiene diepoxide, 1,6-pebutadiene diepoxide, 1, 7-octadiene diepoxide, 1,8-nonanediene epoxide, 1,9-decane diepoxide, 1,10-undecane diepoxide, 1,11-dodecane diepoxide, 1,1,1,1-tetra ( Glycidyloxymethyl) methane and the like.
- the fluoropolyether compound of the present invention is present at the hydroxyl group of the aliphatic hydrocarbon chain having 4 to 10 carbon atoms present at the center of the molecule and at the terminal not on the hydrocarbon chain side of the perfluoropolyether.
- Polar groups can be bonded to the magnetic disk surface.
- the bonds between carbon atoms and oxygen atoms of the aliphatic hydrocarbon chain having 4 to 10 carbon atoms are broken by ultraviolet irradiation or heat treatment to form a strong bond with the magnetic disk surface.
- the lubricity of the magnetic disk surface can be maintained. Therefore, the lubricant containing the fluoropolyether compound of the present invention can maintain the lubricity of the magnetic disk surface even under high temperature by laser heating.
- the compound of the present invention In order to apply the compound of the present invention to the magnetic disk surface, a method in which the compound is diluted with a solvent and applied is preferable.
- the solvent include 3M PF-5060, PF-5080, HFE-7100, HFE-7200, and DuPont Vertrel-XF.
- the concentration of the diluted lubricant is 1 wt% or less, preferably 0.001 to 0.1 wt%.
- the compounds of the present invention can be used alone, and besides that, fluoropolyether lubricants commonly used as lubricants for magnetic disks, such as Fomblin Zdol, Ztetraol, Zdol TX, AM from Solvay Solexis Further, it can also be used by mixing in an arbitrary ratio with Demnum manufactured by Daikin Industries, Krytox manufactured by Dupont, and the like.
- the compound of the present invention can be used as a lubricant for realizing low spacing between the magnetic disk and the head in the magnetic disk apparatus and further improving the sliding durability. Further, since the lubricant of the present invention has very excellent heat resistance, it is suitable as a lubricant for a magnetic disk in a hard disk drive (HDD) equipped with HAMR technology.
- the magnetic head having a carbon protective film in addition to the magnetic disk; magneto-optical recording apparatus, a magnetic tape or the like; surface protective layer of an organic material such as plastic, more Si 3 N 4, SiC, such as SiO 2 inorganic materials It can also be applied as a surface protective film.
- FIG. 1 shows a schematic diagram of a cross section of a magnetic disk of the present invention.
- the magnetic disk of the present invention has a recording layer 2 on a support 1, a protective layer 3 thereon, and a lubricating layer 4 containing the compound of the present invention and a magnetic disk lubricant as the outermost layer. is there.
- the support 1 include aluminum alloys, ceramics such as glass, polycarbonate, and the like.
- the recording layer 2 can have two or more layers.
- the magnetic layer which is a recording layer of the magnetic disk
- an alloy which can form a ferromagnetic material such as iron, cobalt, nickel, etc., and an alloy obtained by adding chromium, platinum, tantalum, etc.
- An oxide is mentioned. These are formed by plating or sputtering.
- the material for the protective layer include carbon, SiC, and SiO 2 . These are formed by sputtering or CVD.
- the thickness of the lubricating layer in circulation is 30 mm or less, if a lubricant having a viscosity of about 100 mPa ⁇ s or more at 20 ° C. is applied as it is, the film thickness may become too large. Therefore, a solution dissolved in a solvent is used for coating. Whether the compound of the present invention is used alone as a lubricant or mixed with other lubricants, it is easier to control the required film thickness when dissolved in a solvent. However, the concentration varies depending on the application method and conditions, the mixing ratio, and the like.
- the film thickness of the lubricant of the present invention is preferably 5 to 15 mm.
- the lubricant In order to form a strong bond between the lubricant and the magnetic disk, it is preferable to apply the lubricant to the surface of the magnetic disk and then perform ultraviolet irradiation or heat treatment. In the case of performing ultraviolet irradiation, it is preferable to use ultraviolet light having a dominant wavelength of 185 nm or 254 nm.
- the temperature for the heat treatment is preferably about 120 to 170 ° C.
- the magnetic disk of the present invention is a magnetic disk having a recording layer, a protective layer, and a lubricating layer in this order on a support, wherein the lubricating layer contains a lubricant containing the fluoropolyether in the protective layer.
- coating to the surface and irradiating an ultraviolet-ray or heat-processing is preferable.
- a method for producing such a magnetic disk a method for producing a magnetic disk having a recording layer, a protective layer and a lubricating layer in this order on a support, wherein the recording layer and the protective layer are formed in this order on the support. And the method of forming the lubricating layer by applying the lubricant containing the fluoropolyether to the surface of the protective layer and irradiating with ultraviolet rays or heat-treating.
- the magnetic disk of the present invention stores a disk and controls a magnetic disk drive equipped with a magnetic head for recording, reproducing or erasing information, a motor for rotating the magnetic disk, and the like. It can be applied to a magnetic disk device composed of a control system.
- an external memory such as an electronic computer or a word processor
- the present invention is also applicable to various devices such as navigation systems, games, mobile phones, PHS, building crime prevention, management or control systems for power plants, etc., or external recording devices.
- Compound 1 was a colorless and transparent liquid, and the density at 20 ° C. was 1.74 g / cm 3 .
- the identification result of the compound 1 performed using NMR is shown.
- Compound 2 was a colorless transparent liquid, and the density at 20 ° C. was 1.77 g / cm 3 .
- the identification result of the compound 2 performed using NMR is shown.
- Compound 3 was a colorless and transparent liquid, and the density at 20 ° C. was 1.70 g / cm 3 .
- the identification result of the compound 3 performed using NMR is shown.
- Example 4 HOCH 2 CF 2 CF 2 CF 2 O (CF 2 CF 2 CF 2 O) w CF 2 CF 2 CF 2 CH 2 —OCH 2 CH (OH) CH 2 CH 2 CH 2 CH 2 CH (OH) CH 2 Synthesis of O—CH 2 CF 2 CF 2 CF 2 O (CF 2 CF 2 CF 2 O) w CF 2 CF 2 CF 2 CH 2 OH (Compound 4) HO—CH 2 CF 2 used in Example 3 Instead of the fluoropolyether represented by CF 2 O (CF 2 CF 2 CF 2 O) z CF 2 CF 2 CH 2 —OH, HO—CH 2 CF 2 CF 2 O (CF 2 CF 2 CF 2 O) except for using fluoropolyethers represented by w CF 2 CF 2 CF 2 -CH 2 -OH in the same manner as in example 3, the compound 4 was obtained 45 g.
- Compound 4 was a colorless and transparent liquid, and the density at 20 ° C. was 1.72 g / cm 3 .
- the identification result of the compound 4 performed using NMR is shown.
- fluoropolyether (number average molecular weight 1350) represented by t-butyl alcohol (39 g), HO—CH 2 CF 2 O (CF 2 O) x (CF 2 CF 2 ) y CF 2 CH 2 —OH , 90 g of a molecular weight distribution, 1.25), a mixture of potassium t-butoxide (0.7 g) and glycidol (5 g) were stirred at 70 ° C. for 14 hours. Thereafter, it was washed with water and dehydrated and purified by silica gel column chromatography to obtain a compound having one hydroxyl group at one end and two hydroxyl groups at the other end.
- Compound 5 was a colorless and transparent liquid, and the density at 20 ° C. was 1.74 g / cm 3 .
- the identification result of the compound 5 performed using NMR is shown.
- Compound 6 is a compound represented by HOCH 2 CH (OH) CH 2 OCH 2 CF 2 O (CF 2 CF 2 O) x (CF 2 O) y CF 2 CH 2 OCH 2 CH (OH) CH 2 OH.
- Fomblin Ztetraol trade name of Solvy Solexis, which is a general lubricant for magnetic disks.
- Compound 6 was produced according to the following production method.
- Fluoropolyether (number average molecular weight) represented by t-butyl alcohol (39 g), HO—CH 2 CF 2 O (CF 2 CF 2 O) x (CF 2 O) y CF 2 CH 2 —OH under argon atmosphere 2393, molecular weight distribution 1.32) 91 g, potassium t-butoxide (0.7 g), and glycidol (10 g) were stirred at 70 ° C. for 14 hours. Thereafter, it was washed with water and dehydrated, and purified by silica gel column chromatography to obtain 82 g of Compound 6 (average molecular weight 2432) having two hydroxyl groups at both ends.
- Compound 6 was a colorless and transparent liquid, and the density at 20 ° C. was 1.73 g / cm 3 .
- the identification result of the compound 6 performed using NMR is shown.
- Compound 7 is compound (HOCH 2 CH (OH) CH 2 OCH 2 CF 2 CF 2 O (HO) 2 CH (OH) CH 2 OH) described in paragraph [0004] of Patent Document 2 (International Publication No. 2009/066784). is CF 2 CF 2 CF 2 O) n CF 2 CF 2 CH 2 OCH 2 CH (OH) CH 2 OH).
- Compound 7 is produced according to the following production method, and has two hydroxyl groups at both ends of the molecule.
- fluoropolyether (number average molecular weight) represented by t-butyl alcohol (41 g), HO—CH 2 CF 2 CF 2 O (CF 2 CF 2 CF 2 O) n CF 2 CF 2 CH 2 —OH
- a mixture of 1850, molecular weight distribution 1.25) 95 g, potassium t-butoxide (0.8 g), and glycidol (11 g) was stirred at 70 ° C. for 14 hours. Thereafter, it was washed with water and dehydrated, and purified by silica gel column chromatography to obtain 90 g of Compound 7 (average molecular weight 1936) having two hydroxyl groups at both ends.
- Compound 7 was a colorless and transparent liquid, and the density at 20 ° C. was 1.75 g / cm 3 .
- the identification result of the compound 7 performed using NMR is shown.
- Test Example 1 Measurement of Bond Ratio
- Each compound was dissolved in Vertrel-XF manufactured by DuPont to obtain a lubricant.
- a 2.5-inch diameter magnetic disk was immersed in this solution for 1 minute and pulled up at a speed of 2 mm / s. Thereafter, the disk coated with the lubricant was inserted into an ultraviolet irradiation apparatus equipped with a low-pressure mercury lamp that emits ultraviolet light having wavelengths of 185 nm and 254 nm for 10 to 20 seconds. At this time, in order to prevent formation of ozone, the inside of the ultraviolet irradiation device was previously substituted with nitrogen.
- the average film thickness of the compound on the disk was measured by a Fourier Transform Infrared Spectrometer (FT-IR). This film thickness is defined as f ⁇ .
- the disk was immersed in a mixed solvent in which Vertrel-XF and methanol were mixed at a volume ratio of 70:30 for 5 minutes, pulled up at a speed of 2 mm / s, and then allowed to stand at room temperature to volatilize the solvent. It was. Thereafter, the average film thickness of the compound remaining on the disk was measured by FT-IR. This film thickness is defined as b ⁇ .
- Bond rate (%) 100 ⁇ b / f
- TG / TDA Thermal Analysis Device
- the comparative compounds 5 to 7 do not change the weight loss temperature before and after the ultraviolet irradiation, whereas the compounds 1 to 4 of the present invention have a lower temperature of the lubricant after the ultraviolet irradiation than before the irradiation. It can be seen that it disassembles and scatters. This is because when the compounds 1 to 4 of the present invention are irradiated with ultraviolet rays, the bond between the carbon atom of the aliphatic hydrocarbon chain having 4 to 10 carbon atoms present in the center of the molecule and the oxygen molecule is broken. In order to produce a molecular weighted compound, it is shown that it evaporates at a lower temperature than before UV irradiation.
- the compounds 5 to 7 do not have an aliphatic hydrocarbon chain having 4 to 10 carbon atoms in the center of the molecule, the ether bond is not broken as described above even when irradiated with ultraviolet rays. It is thought that the weight reduction temperature of the compound does not change before and after the above.
- the compound of the present invention having an aliphatic hydrocarbon chain having 4 to 10 carbon atoms in the center of the molecule has a bond between the carbon atom of the aliphatic hydrocarbon chain and an oxygen atom when irradiated with ultraviolet rays. It is considered that the bond rate is increased by the portion of the ether bond that has been cut and bonded to the surface of the magnetic disk.
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Abstract
Description
項1. 分子の中央部に存在する炭素数4~10の脂肪族炭化水素鎖が、2つ以上のパーフルオロポリエーテルと、それぞれエーテル結合しているフルオロポリエーテル化合物であって、
前記脂肪族炭化水素鎖は、1つ以上の水酸基を有し、
前記2つ以上のパーフルオロポリエーテルは、それぞれ炭化水素鎖側ではない末端に、-OH、-OCH2CH(OH)CH2OH、-OCH2CH(OH)CH2OCH2CH(OH)CH2OH、-O(CH2)mOH、又は-OCH2(OH)CHCH2-OC6H4-R1(ここで、mは2~8の整数である。R1は水素、炭素数1~4のアルコキシ基、アミノ基、又はアミド残基である。)からなる群から選択される少なくとも1種の極性基を有している、フルオロポリエーテル化合物。
項2. 前記脂肪族炭化水素鎖の炭素数が8である、上記項1に記載のフルオロポリエーテル化合物。
項3. 前記フルオロポリエーテル化合物が、
HOCH2CH(OH)CH2OCH2CF2CF2O(CF2CF2CF2O)zCF2CF2CH2-OCH2CH(OH)CH2CH2CH2CH2CH(OH)CH2O-CH2CF2CF2O(CF2CF2CF2O)zCF2CF2CH2OCH2CH(OH)CH2OH、
HOCH2CH(OH)CH2OCH2CF2CF2CF2O(CF2CF2CF2CF2O)wCF2CF2CF2CH2-OCH2CH(OH)CH2CH2CH2CH2CH(OH)CH2O-CH2CF2CF2CF2O(CF2CF2CF2CF2O)wCF2CF2CF2CH2OCH2CH(OH)CH2OH、
HOCH2CF2CF2O(CF2CF2CF2O)zCF2CF2CH2-OCH2CH(OH)CH2CH2CH2CH2CH(OH)CH2O-CH2CF2CF2O(CF2CF2CF2O)zCF2CF2CH2OH、及び
HOCH2CF2CF2CF2O(CF2CF2CF2CF2O)wCF2CF2CF2CH2-OCH2CH(OH)CH2CH2CH2CH2CH(OH)CH2O-CH2CF2CF2CF2O(CF2CF2CF2CF2O)wCF2CF2CF2CH2OHからなる群から選択される少なくとも1種である、上記項1又は2に記載のフルオロポリエーテル化合物。
項4. zが0~30の実数であり、wが0~20の実数である、上記項3に記載のフルオロポリエーテル化合物。
項5. 上記項1~4のいずれかに記載のフルオロポリエーテル化合物を含有する潤滑剤。
項6. 支持体の上に、記録層、保護層及び潤滑層をこの順に有する磁気ディスクであって、
前記潤滑層が、上記項5に記載の潤滑剤を前記保護層の表面に塗布し、紫外線照射又は熱処理することにより形成された層である、磁気ディスク。
項7. 支持体の上に、記録層、保護層及び潤滑層をこの順に有する磁気ディスクの製造方法であって、
支持体上に記録層及び保護層をこの順に形成し、上記項5に記載の潤滑剤を前記保護層の表面に塗布し、紫外線照射又は熱処理することにより潤滑層を形成する、磁気ディスクの製造方法。
前記脂肪族炭化水素鎖は、1つ以上の水酸基を有し、
前記2つ以上のパーフルオロポリエーテルは、それぞれ炭化水素鎖側ではない末端に、-OH、-OCH2CH(OH)CH2OH、-OCH2CH(OH)CH2OCH2CH(OH)CH2OH、-O(CH2)mOH、または-OCH2(OH)CHCH2-OC6H4-R1(ここで、mは2~8の整数である。R1は水素、炭素数1~4のアルコキシ基、アミノ基、又はアミド残基である。)からなる群から選択される少なくとも1種の極性基を有している。
HOCH2CH(OH)CH2OCH2CF2CF2O(CF2CF2CF2O)zCF2CF2CH2-OCH2CH(OH)CH2CH2CH2CH2CH(OH)CH2O-CH2CF2CF2O(CF2CF2CF2O)zCF2CF2CH2OCH2CH(OH)CH2OH、
HOCH2CH(OH)CH2OCH2CF2CF2CF2O(CF2CF2CF2CF2O)wCF2CF2CF2CH2-OCH2CH(OH)CH2CH2CH2CH2CH(OH)CH2O-CH2CF2CF2CF2O(CF2CF2CF2CF2O)wCF2CF2CF2CH2OCH2CH(OH)CH2OH、等の化合物を得ることができる。
HOCH2CF2CF2O(CF2CF2CF2O)zCF2CF2CH2-OCH2CH(OH)CH2CH2CH2CH2CH(OH)CH2O-CH2CF2CF2O(CF2CF2CF2O)zCF2CF2CH2OH、
HOCH2CF2CF2CF2O(CF2CF2CF2CF2O)wCF2CF2CF2CH2-OCH2CH(OH)CH2CH2CH2CH2CH(OH)CH2O-CH2CF2CF2CF2O(CF2CF2CF2CF2O)wCF2CF2CF2CH2OH、等の化合物を得ることができる。
HOCH2CH(OH)CH2OCH2CF2CF2O(CF2CF2CF2O)zCF2CF2CH2-OCH2CH(OH)CH2CH2CH2CH2CH(OH)CH2O-CH2CF2CF2O(CF2CF2CF2O)zCF2CF2CH2OCH2CH(OH)CH2OH(化合物1)の合成
アルゴン雰囲気下、t-ブチルアルコール(41g)、HO-CH2CF2CF2O(CF2CF2CF2O)zCF2CF2CH2-OHで表されるフルオロポリエーテル(数平均分子量1980、分子量分布1.25)95g、カリウム t-ブトキシド(0.6g)、及びグリシドール(3.6g)の混合物を70℃で14時間撹拌した。その後、水洗、脱水し、シリカゲルカラムクロマトグラフィーにより精製し、一方の末端に1つの水酸基を有し、もう一方の末端に2つの水酸基を有する、パーフルオロポリエーテル(平均分子量2110)を95g得た。この化合物(95g)をメタキシレンヘキサフルオライド(95g)に溶解させ、水酸化ナトリウム(3.0g)、及び1,7-オクタジエンジエポキサイド(3.2g)を加えて70℃で14時間撹拌した。その後、水洗、脱水した後、蒸留により精製し、化合物1を60g得た。
δ=-129.7ppm
〔18F、-OCF2CF 2 CF2O-〕、
δ=-83.7
〔36F、-OCF 2 CF2CF 2 O-〕、
δ=-124.2ppm
〔8F、-OCF 2 CF2CH2OCH2CH(OH)CH2CH2CH2CH2CH(OH)CH2-、-OCF 2 CF2CH2OCH2CH(OH)CH2OH〕、
δ=-86.5ppm
〔8F、-OCF2CF 2 CH2OCH2CH(OH)CH2CH2CH2CH2CH(OH)CH2-、-OCF2CF 2 CH2OCH2CH(OH)CH2OH〕
z=9.3
δ=3.2~3.8ppm
〔30H,HOCH 2 CH(OH)CH 2 OCH 2 CF2CF2O(CF2CF2CF2O)zCF2CF2CH 2 -OCH 2 CH(OH)CH2CH2CH2CH2CH(OH)CH 2 O-CH 2 CF2CF2O(CF2CF2CF2O)zCF2CF2CH 2 OCH 2 CH(OH)CH 2 OH〕
δ=1.1ppm
〔8H、HOCH2CH(OH)CH2OCH2CF2CF2O(CF2CF2CF2O)zCF2CF2CH2-OCH2CH(OH)CH 2 CH 2 CH 2 CH 2 CH(OH)CH2O-CH2CF2CF2O(CF2CF2CF2O)zCF2CF2CH2OCH2CH(OH)CH2OH〕
HOCH2CH(OH)CH2OCH2CF2CF2CF2O(CF2CF2CF2CF2O)wCF2CF2CF2CH2-OCH2CH(OH)CH2CH2CH2CH2CH(OH)CH2O-CH2CF2CF2CF2O(CF2CF2CF2CF2O)wCF2CF2CF2CH2OCH2CH(OH)CH2OH(化合物2)の合成
実施例1において用いたHO-CH2CF2CF2O(CF2CF2CF2O)zCF2CF2CH2-OHで表されるフルオロポリエーテルの代わりに、HO-CH2CF2CF2O(CF2CF2CF2CF2O)wCF2CF2CF2-CH2-OHで表されるフルオロポリエーテルを用いた以外は実施例1と同様にして、化合物2を58g得た。
δ=-83.7ppm
〔32F、-OCF 2 CF2CF2CF 2 O-、-OCF 2 CF2CF2CH2OCH2CH(OH)CH2CH2CH2CH2CH(OH)CH2-、-OCF 2 CF2CF2CH2OCH2CH(OH)CH2OH〕、
δ=-120.5ppm
〔12F、-OCF2CF2CF 2 CH2OCH2CH(OH)CH2CH2CH2CH2CH(OH)CH2-、-OCF 2 CF2CF 2 CH2OCH2CH(OH)CH2OH〕、
δ=-125.8ppm
〔24F、-OCF2CF 2 CF 2 CF2O-〕、
δ=-127.6ppm
〔8F、-OCF2CF 2 CF2CH2OCH2CH(OH)CH2CH2CH2CH2CH(OH)CH2-、-OCF2CF 2 CF2CH2OCH2CH(OH)CH2OH〕
w=3.0
δ=3.2~3.8ppm
〔30H,HOCH 2 CH(OH)CH 2 OCH 2 CF2CF2CF2O(CF2CF2CF2CF2O)wCF2CF2CF2CH 2 -OCH 2 CH(OH)CH2CH2CH2CH2CH(OH)CH 2 O-CH 2 CF2CF2CF2O(CF2CF2CF2CF2O)wCF2CF2CF2CH 2 OCH 2 CH(OH)CH 2 OH〕
δ=1.1ppm
〔8H、HOCH 2 CH(OH)CH2OCH2CF2CF2CF2O(CF2CF2CF2CF2O)wCF2CF2CF2CH2-OCH2CH(OH)CH 2 CH 2 CH 2 CH 2 CH(OH)CH2O-CH2CF2CF2CF2O(CF2CF2CF2CF2O)wCF2CF2CF2CH2OCH2CH(OH)CH2OH〕
HOCH2CF2CF2O(CF2CF2CF2O)zCF2CF2CH2-OCH2CH(OH)CH2CH2CH2CH2CH(OH)CH2O-CH2CF2CF2O(CF2CF2CF2O)zCF2CF2CH2OH(化合物3)の合成
アルゴン雰囲気下、HO-CH2CF2CF2O(CF2CF2CF2O)zCF2CF2CH2-OHで表されるフルオロポリエーテル(数平均分子量1890、分子量分布1.20)80gをメタキシレンヘキサフルオライド(80g)に溶解させ、水酸化ナトリウム(2.4g)、及び1,7-オクタジエンジエポキサイド(2.6g)を加えて70℃で14時間撹拌した。その後、水洗、脱水した後、蒸留により精製し、化合物3を55g得た。
δ=-129.7ppm
〔36F、-OCF2CF 2 CF2O-〕、
δ=-83.7
〔72F、-OCF 2 CF2CF 2 O-〕、
δ=-124.2ppm
〔4F、-OCF 2 CF2CH2OCH2CH(OH)CH2CH2CH2CH2CH(OH)CH2-〕、
δ=-126.4ppm
〔4F、-OCF 2 CF2CH2OH〕、
δ=-86.5ppm
〔8F、-OCF2CF 2 CH2OCH2CH(OH)CH2CH2CH2CH2CH(OH)CH2-、-OCF2CF 2 CH2OCH2CH(OH)CH2OH〕
z=9.1
δ=3.2~3.8ppm
〔18H,HOCH 2 CF2CF2O(CF2CF2CF2O)zCF2CF2CH 2 -OCH 2 CH(OH)CH2CH2CH2CH2CH(OH)CH 2 O-CH 2 CF2CF2O(CF2CF2CF2O)zCF2CF2CH 2 OH〕
δ=1.1ppm
〔8H、HOCH2CF2CF2O(CF2CF2CF2O)zCF2CF2CH2-OCH2CH(OH)CH 2 CH 2 CH 2 CH 2 CH(OH)CH2O-CH2CF2CF2O(CF2CF2CF2O)zCF2CF2CH2OH〕
HOCH2CF2CF2CF2O(CF2CF2CF2CF2O)wCF2CF2CF2CH2-OCH2CH(OH)CH2CH2CH2CH2CH(OH)CH2O-CH2CF2CF2CF2O(CF2CF2CF2CF2O)wCF2CF2CF2CH2OH(化合物4)の合成
実施例3において用いたHO-CH2CF2CF2O(CF2CF2CF2O)zCF2CF2CH2-OHで表されるフルオロポリエーテルの代わりに、HO-CH2CF2CF2O(CF2CF2CF2CF2O)wCF2CF2CF2-CH2-OHで表されるフルオロポリエーテルを用いた以外は実施例3と同様にして、化合物4を45g得た。
δ=-83.7ppm
〔32F、-OCF 2 CF2CF2CF 2 O-、-OCF 2 CF2CF2CH2OCH2CH(OH)CH2CH2CH2CH2CH(OH)CH2-、-OCF 2 CF2CF2CH2OH〕、
δ=-120.5ppm
〔4F、-OCF2CF2CF 2 CH2OCH2CH(OH)CH2CH2CH2CH2CH(OH)CH2-〕、
δ=-122.8ppm
〔4F、-OCF2CF2CF 2 CH2OH〕、
δ=-125.8ppm
〔24F、-OCF2CF 2 CF 2 CF2O-〕、
δ=-127.6ppm
〔8F、-OCF2CF 2 CF2CH2OCH2CH(OH)CH2CH2CH2CH2CH(OH)CH2-、-OCF2CF 2 CF2CH2OCH2CH(OH)CH2OH〕
w=3.0
δ=3.2~3.8ppm
〔18H,HOCH 2 CF2CF2CF2O(CF2CF2CF2CF2O)wCF2CF2CF2CH 2 -OCH 2 CH(OH)CH2CH2CH2CH2CH(OH)CH 2 O-CH 2 CF2CF2CF2O(CF2CF2CF2CF2O)wCF2CF2CF2CH 2 OH〕
δ=1.1ppm
〔8H、HOCH2CF2CF2CF2O(CF2CF2CF2CF2O)wCF2CF2CF2CH2-OCH2CH(OH)CH 2 CH 2 CH 2 CH 2 CH(OH)CH2O-CH2CF2CF2CF2O(CF2CF2CF2CF2O)wCF2CF2CF2CH2OH〕
δ=-52.1ppm、-53.7ppm、-55.4ppm
〔24F、-OCF 2 O-〕、
δ=-89.1ppm、-90.7ppm
〔48F、-OCF 2 CF 2 O-〕、
δ=-77.9ppm、-80.0ppm
〔8F、-OCF 2 CH2OCH2CH(OH)CH2O-、-OCF 2 CH2OCH2CH(OH)CH2OH〕、
x=6.2、y=6.1
δ=3.2~3.8ppm
〔28H、HOCH 2 CH(OH)CH 2 OCH 2 -CF2O(CF2O)x(CF2CF2O)yCF2CH 2 、-O-CH 2 CH(OH)CH 2 O-〕
δ=-52.1ppm、-53.7ppm、-55.4ppm
〔24F、-OCF 2 O-〕、
δ=-89.1ppm、-90.7ppm
〔48F、-OCF 2 CF 2 O-〕、
δ=-77.9ppm、-80.0ppm
〔4F、-OCF 2 CH2OCH2CH(OH)CH2OH〕、
x=12.1、y=12.3
δ=3.2~3.8ppm
〔18H、HOCH 2 CH(OH)CH 2 OCH 2 -CF2O(CF2CF2O)x(CF2O)yCF2CH 2 -O-CH 2 CH(OH)CH 2 OH〕
δ=-129.7ppm
〔26F,-OCF2CF 2 CF2O-〕,
δ=-83.7
〔52F,-OCF 2 CF2CF 2 O-〕,
δ=-124.2ppm
〔4F,-OCF 2 CF2CH2OCH2CH(OH)CH2OH〕,
δ=-86.5ppm
〔4F,-OCF2CF 2 CH2OCH2CH(OH)CH2OH〕
n=13.0
δ=3.2~3.8ppm
〔18H,HO-CH 2 CH(OH)CH 2 O-CH 2 CF2CF2O(CF2CF2CF2O)nCF2CF2CH 2 -O-CH 2 CH(OH)CH 2 OH〕
各化合物を、それぞれDuPont製Vertrel-XFに溶解し、潤滑剤とした。直径2.5インチの磁気ディスクをこの溶液に1分間浸漬し、速度2mm/sで引き上げた。その後、潤滑剤を塗布したディスクを、波長185nm及び254nmの紫外光を発光する低圧水銀ランプを取り付けた紫外線照射装置の内部に10~20秒間挿入した。この際、オゾンの形成を防ぐため、紫外線照射装置の内部は予め窒素で置換した。この後、Fourier Transform Infrared Spectorometer(FT-IR)でディスク上の化合物の平均膜厚を測定した。この膜厚をfÅとする。次に、このディスクをVertrel-XFとメタノールとを容積比70:30で混合した混合溶媒中に5分間浸漬し、速度2mm/sで引き上げた後、室温下で静置して溶媒を揮発させた。この後、ディスク上に残った化合物の平均膜厚をFT-IRで測定した。この膜厚をbÅとする。ディスクとの吸着性の強弱を示す指標として、一般に用いられているボンド率を採用した。ボンド率は、下記式で表される。
ボンド率(%)=100×b/f
各化合物0.3gをシャーレに入れ、紫外線照射装置(波長185nm及び254nm)を用い、窒素雰囲気下で6時間照射した。紫外線照射前の各化合物と、紫外線照射後の各化合物について、熱分析装置(TG/TDA)を用いて窒素雰囲気下、昇温速度2℃/分で加熱し、化合物が10%減少したときの温度を計測した。また、UV照射前後での試料が10%減少したときの重量減少温度を比較することで、分解性を評価した。
2 記録層
3 保護層
4 潤滑層
Claims (7)
- 分子の中央部に存在する炭素数4~10の脂肪族炭化水素鎖が、2つ以上のパーフルオロポリエーテルと、それぞれエーテル結合しているフルオロポリエーテル化合物であって、
前記脂肪族炭化水素鎖は、1つ以上の水酸基を有し、
前記2つ以上のパーフルオロポリエーテルは、それぞれ炭化水素鎖側ではない末端に、-OH、-OCH2CH(OH)CH2OH、-OCH2CH(OH)CH2OCH2CH(OH)CH2OH、-O(CH2)mOH、又は-OCH2(OH)CHCH2-OC6H4-R1(ここで、mは2~8の整数である。R1は水素、炭素数1~4のアルコキシ基、アミノ基、又はアミド残基である。)からなる群から選択される少なくとも1種の極性基を有している、フルオロポリエーテル化合物。 - 前記脂肪族炭化水素鎖の炭素数が8である、請求項1に記載のフルオロポリエーテル化合物。
- 前記フルオロポリエーテル化合物が、
HOCH2CH(OH)CH2OCH2CF2CF2O(CF2CF2CF2O)zCF2CF2CH2-OCH2CH(OH)CH2CH2CH2CH2CH(OH)CH2O-CH2CF2CF2O(CF2CF2CF2O)zCF2CF2CH2OCH2CH(OH)CH2OH、
HOCH2CH(OH)CH2OCH2CF2CF2CF2O(CF2CF2CF2CF2O)wCF2CF2CF2CH2-OCH2CH(OH)CH2CH2CH2CH2CH(OH)CH2O-CH2CF2CF2CF2O(CF2CF2CF2CF2O)wCF2CF2CF2CH2OCH2CH(OH)CH2OH、
HOCH2CF2CF2O(CF2CF2CF2O)zCF2CF2CH2-OCH2CH(OH)CH2CH2CH2CH2CH(OH)CH2O-CH2CF2CF2O(CF2CF2CF2O)zCF2CF2CH2OH、及び
HOCH2CF2CF2CF2O(CF2CF2CF2CF2O)wCF2CF2CF2CH2-OCH2CH(OH)CH2CH2CH2CH2CH(OH)CH2O-CH2CF2CF2CF2O(CF2CF2CF2CF2O)wCF2CF2CF2CH2OHからなる群から選択される少なくとも1種である、請求項1又は2に記載のフルオロポリエーテル化合物。 - zが0~30の実数であり、wが0~20の実数である、請求項3に記載のフルオロポリエーテル化合物。
- 請求項1~4のいずれかに記載のフルオロポリエーテル化合物を含有する潤滑剤。
- 支持体の上に、記録層、保護層及び潤滑層をこの順に有する磁気ディスクであって、
前記潤滑層が、請求項5に記載の潤滑剤を前記保護層の表面に塗布し、紫外線照射又は熱処理することにより形成された層である、磁気ディスク。 - 支持体の上に、記録層、保護層及び潤滑層をこの順に有する磁気ディスクの製造方法であって、
支持体上に記録層及び保護層をこの順に形成し、請求項5に記載の潤滑剤を前記保護層の表面に塗布し、紫外線照射又は熱処理することにより潤滑層を形成する、磁気ディスクの製造方法。
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| EP3225612B1 (en) | 2019-09-04 |
| US10047317B2 (en) | 2018-08-14 |
| US20170260472A1 (en) | 2017-09-14 |
| EP3225612A4 (en) | 2018-05-09 |
| EP3225612A1 (en) | 2017-10-04 |
| JPWO2016084781A1 (ja) | 2017-09-21 |
| JP6804981B2 (ja) | 2020-12-23 |
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