56results about "Protective coatings for layers" patented technology

This fluorine-containing ether compound is represented by a formula. R1-CH2-R2-(CH2-OCH2-CR3R4-CH2O-CH2-R2)z-CH2-R5 (where z is 1 or 2; R2 is a perfluoropolyether chain; R1 and R5 are each a C1-50 terminal group having at least one polar group; R3 and R4 may be the same or different, and are each a C1-5 organic group that is bonded to a tetrasubstituted carbon atom and that does not include a secondary hydroxyl group or a tertiary hydroxyl group but includes one primary hydroxyl group; and the organic group may include an ether oxygen atom between the carbon atoms, and may have an ether oxygen atom as the terminus for bonding with the tetrasubstituted carbon atom.)

The fluorinated ether compound represented by the following formula. R 1 -[B]-[A]-CH2-R 2 -CH2-[C]-[D]-R 3 (R 2 [A] is a perfluoropolyether chain; [B] is formula (2-1); [C] is formula (3-1); [D] is formula (3-2); R 3 For equation (4); R 1 (This is a terminal group.)

Provided is a method for manufacturing a magnetic recording medium, which efficiently removes foreign matter on the surface of the magnetic recording medium and improves the coating rate by using a lubricating layer. The method for manufacturing a magnetic recording medium in which a lubricating layer is formed on a laminate includes a step of applying a first lubricant and a second lubricant on the laminate, a step of polishing the surface of the laminate coated with the first lubricant and the second lubricant with a polishing material, and a step of removing the second lubricant from the laminate. The step of applying the second lubricant uses an immersion method or a spin coating method, the solvent of the second lubricant used in these methods makes the dissolved amount of the second lubricant higher than the dissolved amount of the first lubricant, and the polishing step includes a step of pressing and rubbing a tape containing a polishing material against the surface of the laminate. The step of removing the second lubricant includes irradiating the laminate coated with the first lubricant and the second lubricant with ultraviolet rays, or heating the laminate coated with the first lubricant and the second lubricant.

By using the lubricant for a magnetic recording medium containing the fluorine-containing ether compound of the present invention, a lubricating layer with good corrosion resistance and capable of suppressing spin-off can be formed even if it is thin. 【Solution means】A fluorine-containing ether compound represented by formula (1). R 1 -CH2-R 2 -CH2-R 3 (1). R 2 is a perfluoropolyether chain. R 1 and R 3 are terminal groups having 1 to 4 polar groups and 1 to 50 carbon atoms. R 1 and R 3 At least one of them is a terminal group represented by formula (2). -O-X-CH(OH)-CH2OH (2). X is a divalent organic group having 2 to 30 carbon atoms which may contain at least one of 1 to 2 polar groups and 1 to 3 ether oxygen atoms. X contains at least one carbon atom not bonded to either the polar group or the ether oxygen atom.

A fluorine-containing ether compound represented by the following formula. R1—CH2—R2a—CH2—R3a—CH2—R2b—CH2—R3b—CH2—R2c—CH2—R3c—CH2—R2d—CH2—R4 (R2a, R2b, R2c and R2d are each a perfluoropolyether chain, R3a, R3b, and R3c are each a divalent linking group having one or more polar groups, at least one of R3a, R3b, and R3c is represented by —OCH2CH(OH)CH2O—, and R1 and R4 are each a terminal group having 1 to 50 carbon atoms and one or more polar groups, and may be the same as or different from each other).

The present invention provides a method for manufacturing a magnetic recording medium that can efficiently remove foreign matter from the surface of the magnetic recording medium and has a high coverage rate by the lubricating layer. [Solution] The present invention relates to a method for manufacturing a magnetic recording medium, which involves forming a lubricating layer on a laminate obtained by laminating a magnetic recording layer and a protective layer on a substrate in that order, and comprises the steps of: applying a first lubricant and a second lubricant to the laminate; burning the surface of the laminate to which the first lubricant and the second lubricant have been applied with an abrasive; and removing the second lubricant from the laminate, wherein a spin coating method is used for applying the second lubricant, the burning step includes pressing a tape containing an abrasive onto the surface of the laminate and rubbing it, and the step of removing the second lubricant includes at least one of the steps of irradiating the laminate to which the first lubricant and the second lubricant have been applied with ultraviolet light and heat treating the laminate to which the first lubricant and the second lubricant have been applied.

There is provided a fluorine-containing ether compound represented by the following formula:wherein R3, R5 and R7 are the same perfluoropolyether chains or at least one thereof is different; R2, R4, R6 and R8 are each independently a divalent linking group having one or more polar groups; R1 and R9 are each independently an end group containing a tertiary amine, and represented by —X—NR10R11 (X is a divalent hydrocarbon group having 1 to 5 carbon atoms; R10 and R11 are the same or different aliphatic groups; and R10 and R11 may form a ring structure together with a nitrogen atom).

The purpose of the present invention is to provide a method for manufacturing a magnetic recording medium, wherein foreign matter on the surface of the magnetic recording medium can be efficiently removed, and the coating rate by a lubricating layer is high. A method for manufacturing a magnetic recording medium according to the present invention is a method for manufacturing a magnetic recording medium in which a lubricating layer is formed on a laminate in which a magnetic recording layer and a protective layer are laminated in this order on a substrate, the method comprising: a step for applying a first lubricant and a second lubricant on the laminate, and a polishing step for polishing the surface of the laminate to which the first lubricant and the second lubricant have been applied with a polishing material, and a step for removing the second lubricant from the laminate, the polishing step including: a step for pressing and rubbing a tape containing the polishing material against the surface of the laminate; the step of removing the second lubricant includes a step of irradiating the laminate coated with the first lubricant and the second lubricant with light emitted from an LED light source.

Provided is a fluorine-containing ether compound represented by the following formula. Formula: R1-CH2-R2-CH2-R3-CH2-R4-CH2-R5 (wherein: R3 represents a divalent organic group containing an alicyclic structure having 3-13 carbon atoms and at least one polar group and containing no perfluoropolyether chain; R2 and R4 represent a perfluoropolyether chain; and R1 and R5 represent a terminal group which contains two or three polar groups and in which the individual polar groups are bonded to different carbon atoms and the carbon atoms, to which the polar groups are bonded, are bonded to one another via a linkage group including a carbon atom to which no polar group is bonded).

Provided is a fluorine-containing ether compound represented by the following formula: R1–CH2–R2[–CH2–R3–CH2–R2]x–CH2–R4. (In the formula, x is 0-2. R2 represents a perfluoropolyether chain. R3 represents a divalent linking group having 1-4 polar groups. R1 and R4 each represent a terminal group having 1-4 polar groups and 1-50 carbon atoms. At least one of R1 and R4 is a group represented by formula (2). In formula (2), a is 0-2. b of a moieties and c of a moieties are 1-6. One of d and e is 0 and the other is 1-6. Ra, Rb, Rc, and Rd of a moieties each represent an alkyl group having 1-8 carbon atoms or a hydrogen atom.)

A lubricant provides enhanced performance at high temperatures, along with a higher evaporation temperature, where the main-chain includes a moiety with a rotational energy barrier that is higher than CF2. The lubricant has the general Formula (I):wherein Rc is a multivalent central group, Rb is a main chain group having a constituent with a higher rotational energy threshold than CF2, Re is an end group having at least one anchoring functional group, m is from 2 to 50, and n is from 2 to 8. The constituent with a higher rotational energy threshold than CF2, may be a substituted or non-substituted aromatic group.

High temperature lubricants for magnetic media include a plurality of segments according to general formula (I):where Rd is any linker chemistry and each Re may be a reactive end-group and anchoring group containing at least one constituent configured for at least one of tribochemical, thermochemical, or optochemical bonding. The at least one constituent can be cyclopropane or cyclobutane.

A lubricant adheres to a magnetic recording medium via at least one of chemisorption or bonding, and contains a perfluorinated polyether attached to or terminated with a functional group that is phosphonic acid, silanol or carboxylic acid, and may be: R1-Rf-R1 where Rf is –CF2O(CF2CF2CF2CF2O)n–, –CF2O(CF2CF2CF2O)nCF2–, – CF2O[CF(CF3)CF2O]nCF2–, –CF2O(CF2CF2O)m(CF2O)nCF2–, –CF2O(CF2CF2O)nCF2–, n, m is from 1 to 100 and R1 is the functional group. A lubricant is formed from a multiple ether segments according to formula: Re1-Rb1-Ri-Rc-Ri-Rb2-Re2; where Rc includes perfluoroalkyl ether, Rb1 and Rb2 are, independently, a sidechain segment including a perfluoroalkyl ether, optional Ri independently is a divalent linking segment including a functional group including elements from periodic table Group 13–17, and of Re1 and Re2 are phosphonic acid, silanol or carboxylic acid. Lubricant synthesis includes reacting a perfluorinated polyether with a halogenated functional group, selected from phosphonic acid, silanol or carboxylic acid.

The present invention provides a fluorine-containing ether compound represented by the following formula.R1—CH2—R2—CH2—R3—CH2—R4—CH2—R5—CH2—R6—CH2—R7 (In Formula (1), R2, R4, and R6 are perfluoropolyether chains, R3 is Formula (2), R5 is Formula (3), and R1 and R7 are each independently a terminal group having two or three polar groups, in which individual polar groups are bound to different carbon atoms and the carbon atoms to which the polar groups are bound are bound to each other via a linking group containing a carbon atom to which no polar group is bound).

An object is to provide a lubricant whose heat resistance and adhesion to a magnetic disk are further improved, a multimerized fluoropolyether compound which is for realizing the lubricant, and a magnetic disk for which the lubricant and the fluoropolyether compound are used. The object is attained by linking two perfluoropolyether group-containing groups with a linking group having the following structure:In the formula, i is an integer of 1 to 10, and R5 and R6 are each independently a hydrocarbon group having 1 to 10 carbon atoms and may each independently contain a polar group and / or an ether bond formed by substitution of at least one carbon atom in the hydrocarbon group with an oxygen atom.

The invention provides a magnetic recording medium production apparatus, a magnetic recording medium production method, and a finishing device, which can detect or predict the generation of defective products at an early stage during the production of a magnetic recording medium so as to improve the productivity of the magnetic recording medium. The apparatus for producing a magnetic recording medium includes: a film forming device that sequentially forms at least a magnetic recording layer and a protective layer on a substrate; a lubricant coating device for coating a lubricant on the protective layer formed by the film forming device to form a lubricating layer; and a finishing device for finishing the surface of the lubricating layer coated by the lubricant coating device by using an abrasive material, the magnetic recording medium production apparatus comprising: a collection unit for collecting data of a load amount during finishing; a storage unit that stores data of the collected load amount; a calculation unit that performs calculation using the stored load amount data; and a setting unit that sets manufacturing conditions for the film forming device or the lubricant coating device on the basis of the calculation results of the calculation unit.

This invention relates to printed matter and a method for manufacturing printed matter. In the printed matter, a recording medium is folded and pressed together using the surface where the image portion and the pressure phase change layer are formed as the pressing surface, or the recording medium is overlapped and pressed together with other recording media using the surface where the image portion and the pressure phase change layer are formed as the pressing surface, the pressing surfaces of the printed matter are peeled off from each other, and the printed matter is unfolded. When observing the surface on the unfolded object corresponding to the pressing surface of the printed matter, at the outer edge portion E corresponding to at least one edge of the printed matter, the exposed area ratio EA of the pressure phase change layer is less than the exposed area ratio IA of the pressure phase change layer in the region other than the outer edge portion E.

Lubricants with epoxide-based linkages for Heat Assisted Magnetic Recording (HAMR) are provided. Epoxide chemistry produces one such lubricant for magnetic media according to general formula (Ia): (Formula (Ia)) where Dn is –(CF2CF2CF2O)n-, R1, R2, R3, R4, R5 and R6 independently comprise single or branched non-fluorinated or fluorinated C1-C10 alkyl, C1-C10 alkoxy, benzene, naphthalene, anthracene, phenanthrene, dibenz[a,h]anthracene, pyrene or benzopyrene, with n being from 2 to 50.

The present invention provides a magnetic recording medium production apparatus, a magnetic recording medium production method, and a burnishing apparatus that enable early detection or prediction of defective products during the production of magnetic recording media, thereby improving the productivity of magnetic recording media. [Solution] A production apparatus for a magnetic recording medium 1, comprising: a film deposition apparatus that deposits at least a magnetic recording layer 112 and a protective layer 113 on a substrate 111 in that order; a lubricant application apparatus that applies a lubricant onto the protective layer 113 deposited by the film deposition apparatus to form a lubricating layer 12; and a burnishing apparatus that burns the surface of the lubricating layer 12 applied by the lubricating apparatus with an abrasive, further comprising: a collection unit that collects load amount data during burnishing; a storage unit that stores the collected load amount data; a calculation unit that performs calculations using the stored load amount data; and a setting unit that sets the manufacturing conditions of the film deposition apparatus or the lubricating apparatus based on the calculation results from the calculation unit.

To provide a highly heat-resistant fluoropolyether compound that can maintain a protective surface layer even at high temperatures, and a lubricant and a magnetic disk containing the same.SOLUTION: Provided is a fluoropolyether compound in which three groups containing a perfluoropolyether chain in the main chain are bonded via a trivalent linking group represented by the following formula (1). In formula (1), R1 is a saturated hydrocarbon group having 1 to 3 carbon atoms, a perfluoroalkyl group having 1 to 3 carbon atoms, an alkoxy group having 1 to 3 carbon atoms, a hydroxyl group, or an amino group; A1, A2, and A3 are each independently an aromatic group.SELECTED DRAWING: None

This fluorine-containing ether compound is represented by the following formula. R1-R2-CH2-R3[-CH2-R4-CH2-R3]x-CH2-R5-R6 (where R1 and R6 are organic groups having 1-50 carbon atoms, R2 is formula (2-1) or (2-2), R5 is formula (2-3) or (2-4), R3 is a perfluoropolyether chain, R4 is formula (3-1) or (3-2), and x is 0-2.)

Provided is a glass for a magnetic recording medium substrate or for a glass spacer for a magnetic recording / reproducing apparatus, in which the total content of Li2O, Na2O, K2O, B2O3, and ZnO (Li2O + Na2O + K2O + B2O3 + ZnO) is in a range of 0 mol% or more and 3 mol% or less, the mole ratio of the total content of Al2O3 and MgO relative to the total content of SiO2 and CaO [(Al2O3 + MgO) / (SiO2 + CaO)] is in a range of 0.30 or more and 0.6 or less, the total content of SiO2 and Al2O3 (SiO2 + Al2O3) is in a range of 64 mol% or more and 85 mol% or less, and the total content of SiO2, Al2O3, MgO, and CaO (SiO2 + Al2O3 + MgO + CaO) is in a range of 87 mol% or more and 98 mol% or less.

A high temperature lubricant for magnetic media includes a plurality of segments according to the general formula (I): Rc-Rd-Rc (I) wherein Rd is any of the linker chemical structures, and each Rc can be a reactive end group and an anchor group comprising at least one component configured to effect at least one of frictional chemical bonding, thermal chemical bonding, or photo-chemical bonding. The at least one component can be cyclopropane or cyclobutane.

To provide a lubricant for use in energy-assisted magnetic disk devices like HAMR, capable of inhibiting oxidative degradation in an oxygen-containing atmosphere and sustaining high heat resistance.SOLUTION: A fluoropolyether compound includes at least one ether linkage in its molecule. In the molecular structure, at least one hydrogen atom bonded to the carbon atom linked to the oxygen atom of an ether linkage has undergone fluorine substitution.SELECTED DRAWING: Figure 1

There is provided a fluorine-containing ether compound represented by the following formula: R1—R2—CH2—R3[—CH2—R4—CH2R3′]n—CH2—R5—R6 (n is 1 or 2; R3 and R3′ are a perfluoropolyether chain; R4 is a divalent linking group having one polar group; R2 and R5 are a divalent linking group having one or more polar groups; R2 has an oxygen atom at an end that is bonded to R1; R5 has an oxygen atom at an end that is bonded to R6; R1 and R6 in end group bonded to an oxygen atom at an end of R2 or R5; and R1 and R6 are an organic group having 1 to 50 carbon atoms, and at least one of them is a group in which a carbonyl carbon atom or nitrogen atom constituting an amide bond is bonded to a carbon atom of an organic group having 1 to 8 carbon atoms).

To suppress the occurrence of errors at the time of recording or reproducing data by reducing the difference in level of a lubricant on the surface of a magnetic recording medium.SOLUTION: According to an embodiment, there is provided a method of controlling a heat assisted magnetic recording and reproducing device in which a heat assisted magnetic recording head including a main magnetic pole, a near field transducer that generates near field light, a waveguide that propagates light to the near field transducer, and a laser light source that supplies light to the waveguide, and a heat assisted magnetic recording medium including a lubricant layer on a recording surface facing the heat assisted magnetic recording head are mounted, the method including: And performing a smoothing process of a surface of the lubricant layer by operating the thermally assisted magnetic recording head.SELECTED DRAWING: Figure 1

To provide a lubricant having further improved heat resistance and adhesion to a magnetic disk, an oligomerized fluoropolyether compound for achieving the lubricant, and a magnetic disk using the lubricant and the oligomerized fluoropolyether compound.SOLUTION: The problem is solved by linking two perfluoropolyether group-containing groups with a linking group having the following structure. -R5-CH (OH) CH2 (CF2) iCH2CH (OH) - R6 - In the formula, I is an integer of 1 to 10, and R5 and R6 are each independently a hydrocarbyl group having 1 to 10 carbons, and may contain ether bonds in which at least one carbon atom is substituted with oxygen atoms, and / or polar groups.SELECTED DRAWING: None

The method for manufacturing the magnetic recording medium can efficiently remove foreign matters on the surface of the magnetic recording medium, and the coating rate of a lubricating layer is high. A method for manufacturing a magnetic recording medium in which a lubricating layer is formed on a laminate in which a magnetic recording layer and a protective layer are sequentially laminated on a substrate, the method comprising: a step for applying a first lubricant and a second lubricant on the laminate, the present invention relates to a method for polishing a laminate comprising a first lubricant and a second lubricant, a step for polishing the surface of the laminate coated with the first lubricant and the second lubricant with a polishing material, and a step for removing the second lubricant from the laminate, the second lubricant being applied by a spin coating method, the polishing step comprising: a step for pressing and rubbing a tape containing the polishing material against the surface of the laminate; the step for removing the second lubricant includes at least one of a step for irradiating the laminate coated with the first lubricant and the second lubricant with ultraviolet light and a step for heating the laminate coated with the first lubricant and the second lubricant.

We provide polishing tapes that can increase the productivity of magnetic recording media. [Solution] The polishing tape according to this disclosure is a polishing tape obtained by winding a long tape in a roll shape, on which abrasive grains are fixed as an abrasive material on one surface of a support, and the polishing tape is provided with an adhesive layer on the other surface of the support.

To provide a manufacturing method of a magnetic recording medium capable of enhancing productivity of the magnetic recording medium.SOLUTION: A method for manufacturing a magnetic recording medium according to the present invention includes a burnishing step of burnishing, with an abrasive, a surface of a laminate in which a magnetic recording layer and a protective layer are laminated in this order on a substrate, the burnishing step includes a step of using a long polishing tape in which abrasive grains are fixed as the polishing material on a support in a state of being wound in a roll shape, and pressing the polishing tape supplied from the state of being wound in a roll shape against the surface of the laminate to rub the surface, in which the polishing tape in which free abrasive grains are reduced by performing a vacuum treatment in advance is used as the polishing tape in the state of being wound in a roll shape.SELECTED DRAWING: Figure 2