115results about "Protective coatings for layers" patented technology

To provide a film-forming device capable of stabilizing a film thickness distribution of a protective film.SOLUTION: A film-forming device according to the present invention includes: a film-forming chamber; a holder for holding a substrate inside the film-forming chamber; an inlet pipe for introducing a carbon-containing source gas into the film-forming chamber; a cathode electrode with a filament shape; a first power supply that heats the cathode electrode by applying current; an anode electrode provided around the cathode electrode; a second power supply that generates a discharge between the cathode electrode and the anode electrode; a third power supply that applies the potential difference between the cathode electrode or the anode electrode and the substrate; an ionization region, in which the gas is ionized by the discharge; and an acceleration region, in which the ionized gas is accelerated by the potential difference, in which a soft magnetic cylinder is provided around the acceleration region.SELECTED DRAWING: Figure 1

A lubricant for magnetic media is synthesized using click chemistry. In one aspect the lubricant is according to general formula (I):where Rc is a fluorinated or non-fluorinated divalent linking segment; where each Re1 and Re2 is a click linker moiety that can be triazole or sulfone; n is from 2 to 50; where each Rb1 and Rb2 is an optionally non-fluorinated divalent linking segment optionally comprising at least one least one first anchoring functional group engageable with a protective overcoat of a magnetic recording medium; and where each of Rv1 and Rv2, when present, independently comprises a moiety having at least one second anchoring functional group engageable with the protective overcoat of the magnetic recording medium. The click linker moiety may also functional as an anchoring functional group.

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.)

A fluorine-containing ether compound represented by formula (1). R < 1 >-O-CH < 2 >-R < 2 >-CH < 2 >-O-R < 3 > (R < 2 > is a perfluoropolyether chain. R1 is a formula (2-1) or a formula (2-2). And R3 is an organic group having at least one polar group and having 2-65 carbon atoms. In formula (2-1), X1 is a divalent linking group having 1-40 carbon atoms. Y1 and Z1 are organic groups with 1-12 carbon atoms or hydrogen atoms. At least one of X1, Y1, and Z1 contains a primary hydroxyl group. In the formula (2-2), X2 is a divalent linking group having 1-40 carbon atoms. And Y2 is an organic group with 1-12 carbon atoms or a hydrogen atom. And Z2 is an organic group with a carbon atom number of 1-12. And at least one of X2, Y2, and Z2 contains a primary hydroxyl group. )

To provide a magnetic recording medium with a little deterioration in electromagnetic conversion characteristics after repeated running in a high-temperature environment.SOLUTION: In a magnetic recording medium, a protrusion height difference Δ(HD-HB) is 0.7 nm or more, in which an arithmetic mean roughness Ra measured on the surface of a magnetic layer is 2.5 nm or less, a protrusion height HD, with the height of the surrounding substrate area being 0 nm, is measured by an atomic force microscope with respect to an area identified as a dark area in a first binarized image of a backscattered electron image obtained by imaging the surface of the magnetic layer with a scanning electron microscope, and a protrusion height HB, with the height of the surrounding substrate area being 0 nm, is measured by the atomic force microscope with respect to an area identified as a bright area in a second binarized image performed on the higher gradation side than the first binarized image obtained by imaging the surface of the magnetic layer with the scanning electron microscope. A magnetic tape cartridge and a magnetic recording / reproducing device include the magnetic recording medium.SELECTED DRAWING: None

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.

This fluorine-containing ether compound is represented by R1-R2-Y-(CH2)z-O-CH2-R3[-CH2-R4-CH2-R3]x-CH2-O-(CH2)z-Y-R5-R6 (x is 0-1; z is an integer of 2-10; Y is any of O, NH, or S; R3 is a perfluoropolyether chain; R4 is a divalent linking group having 1-3 hydroxyl groups and having oxygen atoms at both ends; R2 is formula (2-1) or (2-2); R5 is formula (2-3) or (2-4); and R1 and R6 are end groups.).

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.

High temperature lubricants for magnetic media are provided. One such lubricant includes an end group having a constituent with a higher rotational energy barrier than CH2. The constituent with the higher rotational energy barrier can be benzene or anisole. The lubricants can be used in conjunction with a magnetic recording medium and / or a magnetic data storage system. The end group is not restricted to a dihydroxy propyl configuration. The anchoring groups can be farther away from the group having a higher rotational energy barrier than CH2,. for example or where n is 0 to 10 and m is 1 to 10.

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.)

High temperature lubricants for magnetic media are provided. One such lubricant includes an end group having a constituent with a higher rotational energy barrier than CH2. The constituent with the higher rotational energy barrier can be benzene or anisole. The lubricants can be used in conjunction with a magnetic recording medium and / or a magnetic data storage system. The end group is not restricted to a dihydroxy propyl configuration. The anchoring groups can be farther away from the group having a higher rotational energy barrier than CH2, for example:where n is 0 to 10 and m is 1 to 10.

Provided is a fluorine-containing ether compound represented by the following formula. R1—R2—CH2—R3[—CH2—R4—CH2—R3]n—CH2—R5—R6 (n represents an integer of 0 to 2, R3 represents a perfluoropolyether chain, R4, R2, and R5 represent a divalent linking group having one or more polar groups, R2 and R5 have an oxygen atom at an end bonded to R1 or R6, R1 and R6 represent an organic group having 1 to 50 carbon atoms or a hydrogen atom, at least one of R1 or R6 is represented by Formula (2), one of X and Y represents C═O, and the other represents —NH—, —NR7— (R7 represents a hydrocarbon group having 1 to 8 carbon atoms), or —O—, Q represents a 5- to 8-membered heterocyclic ring structure, which is formed of a carbon atom of a linking group indicated by a dashed arc together with X and Y, and Z represents 0 to 5 substituents.)

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.

The present disclosure describes a magnetic recording apparatus that provides thermally assisted reading of data from a magnetic recording medium. A magnetic recording medium configured to facilitate the thermally assisted reading is also described. The magnetic recording medium includes a ferrimagnetic capping layer over a magnetic recording layer, wherein the capping layer is configured to enhance a magnetic field emanating from the magnetic recording layer during a read operation or process. The ferromagnetic capping layer may include at least one rare earth metal and at least one transition metal, and in an illustrative example, the ferromagnetic capping layer includes TbFeCo. The magnetic recording medium may also include additional layers, such as a cushion layer (SUL) and a heat sink layer. The magnetic recording device may include both a thermally assisted read head and a thermally assisted write head. The SUL is configured to provide a return path for the magnetic flux during read and write operations.

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.

Provided is a fluorine-containing ether compound represented by the following formula. R1—O—R2—CH2—R3—CH2—R4—O—R5 (R3 represents a perfluoropolyether chain, R2 and R4 represent a divalent linking group having one or more polar groups, R1 and R5 represent Formula (2), Formula (3), or a hydrogen atom, and at least one of R1 or R5 is represented by Formula (2) or (3), in Formula (2), X1 represents an alkylene group having 1 to 30 carbon atoms, and Y and Z represent an aliphatic group having 1 to 30 carbon atoms, in Formula (3), X2 represents an alkylene group having 1 to 30 carbon atoms, and A and B represent an aliphatic group having 1 to 30 carbon atoms.)

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).

A fluorine-containing ether compound represented by the following formula. R 1 -CH2-R 2 [ -CH2-R 3 -CH2-R 2 ] x -CH2-R 4 (x is 1 or 2. R 2 is a perfluoropolyether chain. R 3 is a divalent linking group having 1 to 50 carbon atoms and 1 to 6 polar groups. x R 3 at least one of R 1 and R 4 are terminal groups having 1 to 50 carbon atoms and 1 to 4 polar groups. X and Y are each independently an acyclic divalent saturated hydrocarbon group having 3 to 20 carbon atoms and 1 to 2 polar groups. a and b are each independently 0 or 1.

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.

A highly fluorinated lubricant is configured to be adsorbed by an outer coating of a magnetic recording medium. The lubricant may have the following structure: R1-Rf-R1 wherein Rf is-CF2O (CF2CF2O) nCF2-, where n is from 1 to about 100, or Rf is-CF2CF2O (CF2CF2CF2O) sCF2CF2-,-CF2CF2O (CF2CF2CF2O) sCF2CF2-,-CF2CF2O [CF (CF3) CF2O] sCF2CF2-,-CF2O (CF2CF2O) r (CF2O) sCF2-, or-CF2O (CF2CF2O) sCF2-, and r, s are independently from 1 to about 100, and R1 is a fluorinated hydrocarbon having a functional group terminated with-OH.

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.

A fluorine-containing ether compound represented by formula (1). (1) R1-O-R2-CH2-R3-CH2-R4-R5 (in which R3 is a perfluoropolyether chain, R1 is a C2–8 alkenyl group or a C3–8 alkynyl group, R2 and R4 are each independently a bivalent linking group that includes at least one hydroxyl group, and -R5 is a group that is represented by formula (2)). (2) -O-(CH2)g-N-R6R7 (in which g is an integer that is 2 or 3, R6 and R7 are identical or different saturated aliphatic groups, and R6 and R7 may form a ring structure with a nitrogen atom).

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.