142results about "Protective coatings for layers" patented technology

To provide a magnetic recording / reproducing device that shortens the time required to form a lubricant filling area due to fluctuations in flying height, and a control method thereof.SOLUTION: In a control method for a magnetic recording / reproducing device according to the embodiment: after recording is performed by a thermally assisted magnetic recording head 10 at a head flying height of a first height, the head flying height is changed to a second height H2 higher than the first height; by operating the thermally assisted magnetic recording head 10, a lubricant is filled between the thermally assisted magnetic recording head 10 and a recording surface 1a; and a lubricant-filled region 29 including a lubricant-hardened material 26 and a hardened lubricant material 28, and having the second height H2 is formed.SELECTED DRAWING: Figure 8

What is provided is a fluorine-containing ether compound represented by the following formula.R1—CH2—R2—CH2—OCH2CH(OH)CH2O—CH2—R3—CH2—R4 (In the formula, R2 and R3 are perfluoropolyether chains, and R1 and R4 are terminal groups 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 having a carbon atom to which the polar groups are not bound).

An object is to provide a method for producing a magnetic disk that employs a fluorine-based solvent which has a low global warming potential and in which solubility of a high-polarity perfluoropolyether compound is excellent. This object is achieved by a method for producing a magnetic disk, the method including the step of applying, to a magnetic disk substrate, a lubricant solution containing a lubricant and a hydrofluoroether having a 100-year global warming potential value of less than 1000 and having a structure represented by the following Formula (A):where: Ra represents F, CF2-Re, or CF3; Rb represents O-Rd or C(-Rf)3; Rc represents H, F, or CF3; Re and Rd each independently represent a hydrocarbon group which may be partially substituted by a fluorine atom and each have a main chain in which at least one carbon atom may be replaced by an oxygen atom; and Rfs each independently represent H, F, or a hydrocarbon group that may be partially substituted by a fluorine atom, and the hydrocarbon group that may be partially substituted by the fluorine atom has a main chain in which at least one carbon atom may be replaced by an oxygen atom.

A lubricant including a plurality of segments including a divalent center segment and two sidechain segments, each including a perfluoroalkyl ether moieties is provided in which a dewetting thickness of the lubricant may be determined based in-part on a segment weight average molecular weight of the segments. A magnetic recording medium and a magnetic data storage system including the lubricant are also provided.

A fluorine-containing ether compound is provided which is represented by the following formula: R1—R2—CH2—R3a—CH2—R4a—CH2—R3b—CH2—R4b—CH2—R3c—CH2—R5—R6 (R3a, R3b, and R3c are perfluoropolyether chains; R2, R4a, R4b, and R5 are a divalent linking group having at least one selected from the group consisting of a hydroxyl group, an amino group, a carboxy group, and a sulfo group; 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 are an organic group having 1 to 50 carbon atoms or a hydrogen atom, and at least one of them is a group in which a cyano group is bonded to a carbon atom of an organic group having 1 to 8 carbon atoms).

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

Provided is a fluorine-containing ether compound represented by the following formula. R1-R2-O-CH2-R3-CH2-O-R4-R5 (R3 is a perfluoropolyether chain; R2 is represented by formula (2), R4 is represented by formula (3), and R1 and R5 are each a hydrogen atom or represented by formula (4); in formula (2), a and b are integers of 0-2 and c is an integer of 2-5; in formula (3), d and e are integers of 0-2 and f is an integer of 2-5; at least one of b in formula (2) and e in formula (3) is 1 or greater; and k in formula (4) is an integer of 3-6.)

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

Provided is 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. 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 to the laminate, a step of polishing the surface of the laminate to which the first lubricant and the second lubricant have been applied with a polishing material, a step of removing the second lubricant from the laminate, and a step of forming the lubricating layer on the laminate. The average molecular weight of the first lubricant is higher than the average molecular weight of the second lubricant, the polarity of the first lubricant is higher than the polarity of the second 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 a step of irradiating the laminate coated with the first lubricant and the second lubricant with ultraviolet light, or a step of heating the laminate coated with the first lubricant and the second lubricant.

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.

The invention relates to a method for manufacturing an ID-1 format card according to claim 1, in which: the first plastic layer (12') comprises theoretical locations (14) each corresponding to an ID-1 format card (10), each theoretical location (14) of card (10) being defined by four edges delimiting a surface of ID-1 format card, the adhesive is deposited on the first face of the first layer (12') so as to form on each of the theoretical locations (14) at least two adhesive zones (16a, 16b), each adhesive zone (16a, 16b) being separated from another adhesive zone (16a, 16b) by an empty zone (18) devoid of adhesive connecting at least two edges of a theoretical location (14), at least one support strip (22) on which a thin metal film (24) is deposited is provided opposite the first face of the first layer (12') comprising the adhesive areas (16a, 16b),and wherein the first layer (12') comprising the metallized areas (26a, 26b) is assembled with at least one second layer so as to form a sheet of several cards with a metallized effect, and further comprising a step of cutting in the sheet according to the theoretical locations (14) of the cards (10) of ID-1 format. [Fig. 5],

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.

A lubricant for magnetic media according to general formula (I):Rv1-Rb1-Re1-Rc-Re2-Rb2-Rv2  (I);where Rc is an optionally non-fluorinated divalent linking segment comprising a first at least one anchoring functional group engageable with a protective overcoat of a magnetic recording medium; where each Re1 and Re2 has a rotational energy barrier that is greater than the rotational energy barrier of CH2; where each Rb1 and Rb2 independently is a chain segment comprising at least one of a fluoroalkyl ether moiety, a fluoroalkenyl ether moiety, a perfluoroalkyl ether moiety, a perfluoroalkenyl ether moiety, or a combination thereof; and where each of Rv1 and Rv2, when present, independently each has a second at least one anchoring functional group engageable with the protective overcoat of a magnetic recording medium. -Re1-Rc-Re2 may have the formula:where RL, if present, is CnM2, wherein M is H, and n is from 1 to 10.

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.

Disclosed is a fluorine-containing ether compound which is represented by the formula shown below. R1-O-CH2-R2-(CH2-R3-CH2-R2)n-CH2-O-R4 (In the formula, R1 is formula (2-1) or formula (2-2). R2 represents a perfluoropolyether chain. R4 represents an organic group that has at least one polar group and 1 to 50 carbon atoms. R3 represents a divalent linking group that has at least one hydroxyl group. n is an integer of 0 to 2.)

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.