WO1999053483A1 - Couche de polyamide aromatique pour support d'enregistrement magnetique haute densite - Google Patents
Couche de polyamide aromatique pour support d'enregistrement magnetique haute densite Download PDFInfo
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- WO1999053483A1 WO1999053483A1 PCT/JP1999/001958 JP9901958W WO9953483A1 WO 1999053483 A1 WO1999053483 A1 WO 1999053483A1 JP 9901958 W JP9901958 W JP 9901958W WO 9953483 A1 WO9953483 A1 WO 9953483A1
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- film
- aromatic polyamide
- coating layer
- fine particles
- magnetic recording
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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
- G11B5/73—Base layers, i.e. all non-magnetic layers lying under a lowermost magnetic recording layer, e.g. including any non-magnetic layer in between a first magnetic recording layer and either an underlying substrate or a soft magnetic underlayer
- G11B5/739—Magnetic recording media substrates
- G11B5/73923—Organic polymer substrates
- G11B5/73925—Composite or coated non-esterified substrates
-
- 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
- G11B5/73—Base layers, i.e. all non-magnetic layers lying under a lowermost magnetic recording layer, e.g. including any non-magnetic layer in between a first magnetic recording layer and either an underlying substrate or a soft magnetic underlayer
- G11B5/733—Base layers, i.e. all non-magnetic layers lying under a lowermost magnetic recording layer, e.g. including any non-magnetic layer in between a first magnetic recording layer and either an underlying substrate or a soft magnetic underlayer characterised by the addition of non-magnetic particles
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S428/00—Stock material or miscellaneous articles
- Y10S428/90—Magnetic feature
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24355—Continuous and nonuniform or irregular surface on layer or component [e.g., roofing, etc.]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24942—Structurally defined web or sheet [e.g., overall dimension, etc.] including components having same physical characteristic in differing degree
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/25—Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/26—Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
Definitions
- Aromatic polymer for high density magnetic recording media is described.
- the present invention relates to an aromatic polyamide film suitable as a base film for a high-density magnetic recording medium. More specifically, it has excellent handling properties such as strength, lubricity, and windability, and excellent abrasion resistance.When used as a high-density magnetic recording medium, it has a low electromagnetic conversion characteristic, low dropout resistance, and low output resistance.
- the present invention relates to an aromatic polyamide film having excellent running durability.
- a metal thin film type magnetic recording in which a ferromagnetic metal thin film is formed on a non-magnetic support by physical deposition such as vacuum evaporation and sputtering or plating
- a vapor deposition tape of Co Japanese Patent Application Laid-Open No. 54-147010
- a perpendicular magnetic recording medium comprising a Co-Cr alloy Japanese Patent Application Laid-Open No. 52-134706
- High-density magnetic recording using a thin-layer coating type magnetic recording medium (IEICE Technical Report MR 94-78 (1995-02)) is known.
- Conventional coating type magnetic recording media magnetic recording media in which magnetic powder is mixed with an organic polymer binder and coated on a non-magnetic support) have a low recording density and a long recording wavelength. While the thickness is as thick as about 2 m or more, the ferromagnetic metal thin film formed by thin film forming means such as vacuum evaporation, sputtering or ion plating has a very thin thickness of 0.2 or less, and is extremely thin. In the case of the layer coating type, although a nonmagnetic underlayer is provided, a thickness of 0.13 im has been proposed, and the thickness is extremely thin.
- non-magnetic support base film
- High rigidity is required.
- aromatic polyamide films have recently been actively used as base films for high-density magnetic recording media because of their excellent thin film strength and rigidity due to high Young's modulus.
- the surface condition of the base film greatly affects the surface condition of the magnetic layer. Directly appear as irregularities on the surface of the magnetic layer (magnetic recording layer), which causes noise in the recording and reproduction signals. Therefore, it is desirable that the surface of the nonmagnetic support is as flat as possible.
- a serious problem in actual use is the running property of the metal thin film surface.
- a coating type magnetic recording medium in which a magnetic powder is mixed with an organic polymer binder and applied to a base film a lubricant is dispersed in the binder to improve the running property of the magnetic layer surface.
- such measures cannot be taken, and it is extremely difficult to maintain a stable running property. It has disadvantages such as inferiority.
- inorganic particles have high hardness and are hard to deform, so they are excellent in cleaning magnetic heads.Also, although it is easy to produce fine particles of various sizes, they have poor affinity with polymers, causing particles to fall off. Tend to be easy.
- organic particles have good affinity with polymers, but have lower hardness than inorganic particles, and the particles undergo deformation due to heat and mechanical friction. Therefore, there was a problem that it was inferior.
- the thermal load on the tape is increasing with the high-density mounting due to the miniaturization of the equipment (hardware) used.
- the pitch of the magnetic recording track is very narrow, around 1 O ⁇ m, so dimensional changes in the base film due to thermal history lead to track displacement, leading to deterioration in electromagnetic conversion characteristics. There is a problem.
- An object of the present invention is to provide excellent abrasion and winding properties in a film forming process and, when used as a vapor-deposited metal thin-film type magnetic recording medium, to improve electromagnetic conversion characteristics, gate opening characteristics, output reduction, and running durability. It is to provide an excellent aromatic polyamide film. Another object of the present invention is to prevent the formation of agglomerated particles that cause droplets.
- a laminated film for high-density magnetic recording media that has excellent electromagnetic conversion characteristics, has extremely low dropout, and is capable of producing large-capacity magnetic recording media even when used as a base film of a vapor-deposited metal thin film magnetic recording medium. To provide.
- Still another object of the present invention is to provide a particularly useful surface flatness as a base film for a high-density magnetic recording medium and excellent transportability. It is an object of the present invention to provide an easily transportable thin film film which can satisfy the above characteristics at the same time.
- a biaxially oriented aromatic material consisting of an aromatic polyamide substantially free of inert fine particles and having a sum of Young's moduli in two orthogonal directions on the film surface of at least 2,000 kg / mm 2 ;
- the average particle size (d B : nm) of the film and the thickness (t B : nm) of the coating layer are represented by the following formula (1).
- the coating layer has surface projections on the coating layer surface at a density of 1 ⁇ 10 6 to 1 ⁇ 10 8 / mm 2,
- first aromatic polyamide film of the present invention (Hereinafter, may be referred to as a first aromatic polyamide film of the present invention).
- (A) It is composed of an aromatic polyamide substantially free of inert fine particles, and has a sum of Young's moduli in two orthogonal directions on the film plane of at least 2,000 kg.
- the surfactant consists of a first surfactant having an HLB value of 10 to 14 and a second surfactant having an HLB value of 16 to 18.5, and the average HLB value of the first surfactant and the second surfactant. Is 15 to 18, and the content of each of the first surfactant and the second surfactant is 0.1 to 15% by weight and 10 to 40% by weight in terms of solid content in the coating layer.
- (A) (A1) substantially 2 with the sum of the two directions of the Young's modulus is less that was Resona made of aromatic polyamide orthogonal on the film surface to be containing no inert fine particles, 000 k is GZmm 2 biaxially oriented Aromatic polyamide film and
- a laminated base film comprising 0.01 to 45% by weight of inert fine particles having an average particle size of 1 to 300 nm, a binder resin, and a first coating layer on one side of the polyamide film;
- M 1 is a metal element of Group Ia of the periodic table or a metal element of Group a of the periodic table and X is 1 or 2, or a compound represented by the following formula (3):
- M 1 is the same as above and y is 1 Z 2 or 1.
- aromatic polyamide containing internal inert fine particles having an average particle size of 5 to 1,50 Onm, and having a sum of Young's moduli in two orthogonal directions on the film surface of at least 2,
- a biaxially oriented aromatic polyamide base film having a weight of 0.00 kg Zmm 2 , and
- the second coating layer present on one side of the above, wherein the two types of inert fine particles are the first inert fine particles having an average particle diameter of 100 to 100 nm and the average particle diameter of 5 to 10 nm.
- the second inert fine particles of 0 nm have a ratio of the average particle size of the first inert fine particles to the average particle size of the second inert fine particles of 1.2 or more, and the first inert fine particles and the second inert fine particles have a ratio of not less than 1.2.
- the content of each of the active fine particles is 0.01 to 40% by weight and 1 to 70% by weight in terms of solid content in the second coating layer, and the total of both contents is 75% by weight.
- the thickness of the second coating layer is not less than 1 nm and not more than the average particle diameter of the second inert fine particles.
- Aromatic polyamide film for high-density magnetic recording media and easy transport comprising
- the film using the laminated base film (A 1) is referred to as the third aromatic polyamide film of the present invention
- the film using the biaxially oriented aromatic polyamide base film (A 2) is referred to as the fourth film of the present invention.
- Aromatic polyamide film
- FIG. 1 is a schematic diagram of an apparatus for measuring the abrasion resistance of a film.
- the aromatic polyamide in the present invention may be any one as long as its main chain mainly comprises an aromatic nucleus and an amide bonding group.
- aromatic nuclei forming the main chain those in which the main chain forming substituent on the aromatic nucleus is para-oriented account for 50 to 99.5%, and the strength is required. If the magnetic recording medium is used, the strength tends to be insufficient at less than 50%, and stretching becomes difficult at more than 99.5%.
- the main chain-forming substituent is included in a polymer main chain such as an amide group.
- the para-orientation indicates that the aromatic nucleus is in a 1,4-substituted state when the aromatic nucleus is a phenylene group, and is in a 1,4-monosubstituted state or 2,6-substituted state when the aromatic nucleus is a naphthylene group.
- Y 1; ⁇ 2 is ⁇ , CH 2 , C (CH 3 ) 2 , S ⁇ 2 , S, C Is an atom or group of atoms selected from ⁇
- a polymer ⁇ ⁇ ⁇ products represented in the stomach may be) I.
- the compound is a high ⁇ compound using terephthalic acid as the acid component and ⁇ -phenylenediamine and 3,4'-diaminodiphenyl ether as the amine component.
- the aromatic polyamide of the present invention may be copolymerized with an aliphatic or alicyclic polyamide-forming compound so long as the physical properties of the film are not impaired.
- a compound having three or more groups may be copolymerized.
- a lubricant, an antioxidant, other additives, and other polymers may be blended.
- the aromatic polyamide base film in the present invention is a biaxially oriented film stretched preferably at 5.0 times or more, more preferably 6.0 to 10.0 times in area ratio. If the stretching ratio is small, it is not preferable because high strength cannot be obtained.
- the longitudinal and width directions of the aromatic polyamide base film are controlled. Sum's modulus is 2, OO OkgZmm 2 or more, and preferably from 2, 200 kg / mm 2 or more. If the sum of the longitudinal direction and the Young's modulus in the transverse direction is 2, 000 k gZmm 2 of less than the electromagnetic characteristics because the state of contact between the head to the recording is inadequate is worse, also A thin base film of the order of several m is not preferred because it cannot have sufficient strength.
- each Young's modulus in the width direction is preferably 600 kg / mm 2 or more, more preferably 800 kg / mm 2 or more, and particularly preferably 1, 000 k gZmm 2 or more.
- the upper limit of each direction of the Young's modulus is 3, 500 k gZmm 2.
- the average particle diameter (d B) is necessary to provide a coating layer B formed of inert particles (b) and a binder resin which is a 5 to 10 onm.
- the average particle diameter d B of the inert particles b contained in the coating layer B in the present invention 5 to 10 onm, preferably 10 to 50 nm. Further, those having a uniform particle size distribution are preferred. If the average particle size is less than 5 nm, the slipperiness and abrasion resistance deteriorate, and when rolled up, a blocking phenomenon occurs. On the other hand, if the average particle size exceeds 100 nm, the particles will fall off and the abrasion resistance will deteriorate. In addition, the spacing with the magnetic head is increased, and it is difficult to provide a high-density magnetic recording medium.
- the ratio (t B / d B ) of the layer thickness t B (nm) of the coating layer B to the average particle size d B of the inert particles b is 0.05 to 0.8, preferably 0.08 to 0.6. And more preferably 0.1 to 0.5. If this ratio (t B / d B ) exceeds 0.8, the effect of the inactive particles b to protrude is reduced, resulting in insufficient running durability when used as a magnetic recording medium. On the other hand, when it is smaller than 0.05, particles on the surface of the laminated film are scraped off due to contact with various guide rolls in the film forming process, resulting in insufficient running durability, and the shaved particles adhere to the film. They can accumulate and cause an increase in doorway.
- the inert particles b are contained in the coating layer B in such an amount that the surface protrusions of the coating layer B have a density of 1 ⁇ 10 6 to 1 ⁇ 10 8 particles / mm 2 . If the surface protrusion density is less than 1 ⁇ 10 6 Zm m 2 , the running durability of the magnetic recording medium is insufficient. On the other hand, 1 X 10 More than 8 ZMM 2 when adversely affected electromagnetic conversion characteristics.
- the more preferable surface protrusion density is 2 ⁇ 10 6 to 5 ⁇ 10 7 mm 2 , and still more preferably 3.0 ⁇ 10 6 to 3.0 ⁇ 10 7 / mm 2 .
- the surface roughness of the coating layer B before and after the heat treatment is determined by the following formulas (4) and (5):
- ARa B is the center plane average roughness (nm) measured by an atomic force microscope on the surface of the coating layer B before the heat treatment
- ARa B H is the atomic force microscope on the surface of the coating layer B after the heat treatment. It is preferable that the measured center plane average roughness (nm) is simultaneously satisfied from the viewpoint of durability and electromagnetic conversion characteristics. Further, it is preferable that the number of adhered foreign substances on the surface of the coating layer B is 100 particles / 100 cm 2 or less in order to prevent dropping and to properly process the material.
- core-shell particles particles that are softer on the outside than on the inside
- core-shell particles are particles with a multilayer structure in which the inside and the outside are made of substances with different properties.
- the multilayer means two or more layers, and the property may continuously change in the radial direction.
- the outer part of the particles (hereinafter referred to as the shell part) has the function of reacting with the film base after being coated on the film, or reacting, melting, softening or deforming by heat treatment to adhere to the film base.
- the inside (hereinafter, referred to as the core portion), together with the shell portion, functions as a so-called particle that gives the film an appropriate slipperiness and an optimal spacing with the magnetic head.
- the shell must have excellent affinity with the film base and have appropriate physical, chemical, and thermal properties at the drying processing temperature.
- the core is required not to be deformed by mechanical friction or the like, and to have a relatively high hardness relative to the shell or the base film.
- Examples of the material of the core portion of the core-shell particles b include polystyrene, polystyrenedivinylbenzene, polymethyl methacrylate, and methyl methacrylate.
- Organic materials such as copolymers, cross-linked methyl methacrylate copolymers, polytetrafluoroethylene, polyvinylidene fluoride, polyacrylonitrile, benzoguanamine resin, silica, alumina, titanium dioxide, kaolin, talc, graphite, calcium carbonate, Inorganic substances such as feldspar, molybdenum disulfide, carbon black, and barium sulfate are used.
- a thermoplastic resin is generally preferable, and an acryl-based resin, a polyester-based resin, and the like are particularly preferable.
- a functional group having reactivity or affinity with the film base at an arbitrary ratio in the molecule specifically, a carboxyl group, a hydroxyl group, a glycidyl group, an amide group, It is preferable to introduce an epoxy group, an isocyanate group, or the like.
- Tg glass transition temperature of the shell portion is preferably 80 ° C or lower, more preferably 20 or lower.
- the volume shape factor (f) of the core sieve particles is preferably from 0.1 to ⁇ / 6, and more preferably from 0.4 to 6.
- the volume shape factor (f) of the particle is given by the following equation (6):
- V is the volume of the particles m 3
- R is the average particle size of the particles m
- a shape with a coefficient (f) of 0.4 to ⁇ / 6 substantially includes a sphere (true sphere) and an elliptical sphere like a rugby pole. Particles having a volume shape factor (f) of less than 0.1, for example, flaky particles, make it difficult to obtain sufficient running durability.
- the core-shell particles b are, for example, a system in which the particles of the core part are present, and can be produced by a method of emulsion-polymerizing the polymerizable monomer of the shell part and coating the particle surface of the core part. However, it is not limited by the method for producing particles.
- Particle size d cB ratio of the core portion of the layer thickness t B (nm) and the core-shell particles b of the coating layer B (t B / d cB) is 0.05 to 0.8, preferably 0.08 to 0. 6, more preferably from 0.1 to 0.5.
- the projection density of the core-shell particles b having a height of 0.5; m or more due to the macro-aggregate is 50 or less Zcm 2 .
- the binder resin constituting the coating layer B in the present invention is not limited in its kind and composition as long as the effect of the present invention is not impaired. It is preferable to use an aqueous resin from the viewpoints of physical property control, convenience of process control, work environment, and external environment conservation.
- 7-soluble organic resin and water-dispersible organic resin are preferable.
- water-soluble resins such as acrylic resin, polyester resin, acrylic-polyester resin, alkyd resin, phenol resin, epoxy resin, amino resin, polyurethane resin, vinyl acetate resin, vinyl chloride-vinyl acetate copolymer, and the like
- An aqueous dispersion of a resin insoluble in water can be used.
- These aqueous resins may be a homopolymer or a copolymer, or may be a mixture.
- the coating layer B in the present invention can be formed by applying a coating liquid containing inert fine particles and a binder resin, preferably as an aqueous coating liquid, to at least one surface of the aromatic polyamide base film A, followed by drying. it can.
- the solid content concentration of this coating solution is preferably 0.2 to 10% by weight, more preferably 0.5 to 5% by weight, and particularly preferably 0.7 to 3% by weight.
- This coating liquid preferably an aqueous coating liquid, may optionally contain other components such as a surfactant, a stabilizer, and the like, as long as the effects of the present invention are not impaired. Dispersants, UV absorbers, thickeners and the like can be added.
- the coating is preferably performed on an aromatic polyamide film after stretching and heat treatment described below so as not to excessively heat the coating film.
- the condition for drying the coating film after application is preferably that the coating film is passed through a drying furnace at 100 to 300 ° C. for 1 second to 30 minutes.
- the coating method is not particularly limited, and examples thereof include a roll coating method and a die coating method.
- a known method such as interfacial polymerization or solution polymerization can be used.
- a solution polymerization method is preferable.
- the polymerization solvent include dimethylformamide, dimethylacetamide, N-methylpyrrolidone, N-methylcaprolactam, dimethylsulfoxide, hexamethylphosphoryltriamide, tetramethylurea, 1,3-dimethyl-2-imidazolidinone and the like.
- At least one selected one can be used as a main component.
- an appropriate amount of an inorganic salt such as calcium chloride or lithium chloride may be added before, during or after the polymerization.
- the acid component and the amine component react in substantially equimolar amounts, but any one of the components can be used in excess for the purpose of controlling the degree of polymerization.
- a small amount of a monofunctional acid component or amine component may be used as a terminal blocking agent.
- an aliphatic or aromatic amine or a quaternary ammonium salt can be added to the polymerization system in order to capture hydrogen chloride generated by the reaction.
- a basic inorganic compound for example, sodium hydroxide, calcium hydroxide or calcium oxide is added to carry out a neutralization reaction.
- the logarithmic viscosity of the polymer is preferably 0.5 g / d1 or more, 1. O gZ d 1 or more is more preferable.
- the aromatic polyamide thus obtained can be obtained by putting it in a solvent such as alcohol or water, reprecipitating and separating. Dissolve this in the solvent again It can be used for forming a film by dissolving it.
- the solution obtained by the polymerization reaction is used as it is or after appropriately adjusting the concentration after the polymerization. At this time, the concentration can be adjusted by concentration or dilution with another solvent.
- a solvent those similar to those exemplified as the polymerization solvent can be used, and it is not necessary that the solvent be the same as the solvent used for the polymerization.
- the film forming stock solution prepared as described above is subjected to film formation by a so-called solution casting method.
- the solution casting method includes a dry-wet method, a dry method, a wet method and the like, and any of these methods can be adopted.
- the dry-wet method and the dry method are preferable for obtaining a film having a good surface property.
- a film When a film is formed by a wet method, it is preferable to extrude the undiluted solution directly from a die into a film-forming bath, or to once extrude the solution onto a support such as a drum and introduce the entire support into the wet bath.
- This bath is generally composed of an aqueous medium, and may contain an organic solvent or an inorganic salt in addition to water. By passing through a wet bath, it is possible to extract salts, organic solvents, and the like contained in the film.
- the time required to pass through the entire wet bath depends on the thickness of the film, but is preferably 10 seconds to 30 minutes. Further, the film is stretched in the longitudinal direction. Next, drying, transverse stretching, and heat treatment are performed. These treatments are generally performed at 100 to 500, for a total of 1 second to 30 minutes.
- the undiluted solution is extruded from a die onto a support such as a drum or an endless belt to form a thin film, and then the solvent is scattered from the thin film layer and dried until the thin film has a self-holding property. . Drying conditions are in the range of room temperature to 300, 60 minutes. After the dry process, the film is peeled from the support and introduced into the wet process. The film is subjected to desalting and solvent removal in the same manner as in the wet process described above, and is further stretched, dried and heat-treated to form a film.
- the film is dried on a drum or an endless belt, and the film having self-holding properties is peeled off from these supports, and further dried or removed to remove the residual solvent. , Stretching, and heat treatment.
- the first aromatic polyamide film of the present invention may be provided with, for example, a slippery coating layer C containing inert particles on the surface of the film A opposite to the coating layer B, if necessary. May be laminated using a known method.
- the first aromatic polyamide film of the present invention comprises iron, cobalt, chromium, or an alloy or oxide containing these as a main component on the surface of the layer B by a method such as vacuum deposition, sputtering, or ion plating.
- a ferromagnetic metal thin film layer is formed, and a protective layer such as diamond-like carbon (DLC) and a fluorine-containing carboxylic acid-based lubricant layer are sequentially provided on the surface of the ferromagnetic metal thin film layer, if necessary.
- DLC diamond-like carbon
- fluorine-containing carboxylic acid-based lubricant layer are sequentially provided on the surface of the ferromagnetic metal thin film layer, if necessary.
- This vapor-deposited electromagnetic recording medium is extremely useful as a tape medium for Hi8 for analog signal recording, a digital video cassette recorder (DVC) for digital signal recording, 8 mm for digital recording, and DDSIV.
- DVC digital video cassette recorder
- the surface of the layer B may be provided with iron or iron-based acicular fine magnetic powder, or acicular fine magnetic powder such as iron oxide or chromium oxide, or barium ferrite.
- Etc. are uniformly dispersed in a binder such as vinyl chloride, vinyl chloride / vinyl acetate copolymer, and coated so that the thickness of the magnetic layer is 1 m or less, preferably 0.1 to 1 m.
- a back coat layer by a known method on the surface on the opposite side of the layer B or the surface of the coating layer C, the output in the short wavelength region, and the electromagnetic conversion characteristics such as S / N and CZN can be improved.
- a metal-coated magnetic recording medium for high-density recording with excellent drop-out and low error rate can be obtained.
- a nonmagnetic layer containing fine titanium oxide particles or the like is dispersed and coated on the B layer as an underlayer of the metal powder-containing magnetic layer in the same organic binder as the magnetic layer.
- This metal-coated magnetic recording medium uses 8 mm video for analog signal recording, Hi 8, / 3 cam SP, W-VHS, digital video cassette recorder (DVC) for digital signal recording, data 8 mm, D It is extremely useful as a high-density oxide-coated magnetic recording medium, such as a tape medium for 3 cams, D2, D3, SX, etc., and a data streamer Q 1 C for digital signal recording.
- the above-mentioned W—VHS is an analog VTR for recording HDTV signals
- DVC is applicable for recording digital HDTV signals
- the laminated film of the present invention is used for these HDTV-compatible VTR magnetic recording media. It can be called a very useful base film.
- the second aromatic polyamide film of the present invention has, on one surface of the aromatic polyamide base film A, a coating layer B composed of a binder resin, inert fine particles, and two surfactants having different HLB values.
- These two surfactants consist of a first surfactant having an HLB value of 10 to 14 and a second surfactant having an HLB value of 16 to I8.5. And the average HLB value of these two surfactants is 15-18.
- the binder resin at least one polymer selected from the group consisting of an aqueous polyester resin, an aqueous acrylic resin, an aqueous polyester resin, and a combination thereof is preferably used. Of these, aqueous polyester resins are particularly preferred.
- the acid component is, for example, isophthalic acid, phthalic acid, 1,4-cyclohexanedicarboxylic acid, 2,6-naphthalenedicarboxylic acid, 4,4′-diphenyldicarboxylic acid, adipic acid, sebacic acid, dodecane
- It consists of polycarboxylic acids such as dicarboxylic acid, succinic acid, 5-Na sulfoisophthalic acid, 2-K sulfoterephthalic acid, trimellitic acid, trimesic acid, trimellitic acid monopotassium salt, P-hydroxybenzoic acid, etc.
- the components are, for example, ethylene glycol, diethylene glycol, propylene glycol, 1,4-butanediol, 1,6-hexanediol, 1,4-cyclohexanedimethanol, p-xylylene Polyester resin mainly composed of polyvalent hydroxy compounds such as glycol, dimethylolpropanoic acid, and ethylene oxide adduct of bisphenol A, graft polymer or block copolymer in which acrylic polymer chain is bonded to polyester chain, or 2 Acrylic-modified polyester resins in which a particular polymer forms a specific physical configuration (IPN, coshell) within microparticles can be cited.
- binder resin those capable of dissolving, emulsifying, and finely dispersing in 7 can be preferably used, and those capable of emulsifying and finely dispersing in water are preferable. These may have, for example, a sulfonate group, a sulfonate group, a polyether unit, or the like introduced into the molecule to impart hydrophilicity.
- the type of the inert fine particles is not particularly limited, but preferably has a relatively low specific gravity and does not easily settle in the coating liquid.
- particles made of a heat-resistant polymer for example, cross-linked silicone resin, cross-linked acrylic resin, cross-linked polystyrene, melamine / formaldehyde resin, aromatic polyamide resin, polyamide-imide resin, cross-linked polyester, wholly aromatic polyester, etc.), silicon dioxide (Silica), calcium carbonate and the like.
- a heat-resistant polymer for example, cross-linked silicone resin, cross-linked acrylic resin, cross-linked polystyrene, melamine / formaldehyde resin, aromatic polyamide resin, polyamide-imide resin, cross-linked polyester, wholly aromatic polyester, etc.
- silicon dioxide Silicon dioxide
- particularly preferred are crosslinked silicone resin particles, silica, and core-shell type organic particles (core: crosslinked polystyrene, shell: polymethyl methacrylate, etc.).
- These inert fine particles preferably have an average particle size of 10 to 50 nm.
- the amount used is preferably such that the density of surface protrusions due to inert fine particles on the surface of the coating layer B is 2 ⁇ 10 6 to 2 ⁇ 10 7 Zmm 2 . With this projection density, a further improvement in running durability can be realized.
- the average particle size of the inert fine particles is more preferably 15 to 45 11111, and further preferably 18 to 40 nm.
- the density of the surface protrusions is more preferably 2. 5 X 1 0 6 ⁇ 1 . 8 1 0 7/111111 2, further good Mashiku 3 1 0 6 ⁇ 1. 5 X 1 0 7 pieces mm 2 It is.
- the surfactant in the present invention includes two surfactants having different HLB values, that is, a first surfactant having an HLB value of 10 to 14 and a first surfactant having an HLB value of 16 to: L8.5. It consists of a second surfactant and has an average HLB value of 15 to 18.
- a first surfactant having an HLB value of 10 to 14 and a first surfactant having an HLB value of 16 to: L8.5. It consists of a second surfactant and has an average HLB value of 15 to 18.
- projections originating from agglomerated particles may be generated, causing dropout
- it is not possible to eliminate coating problems such as coating omission and foam streaks due to cissing while suppressing the occurrence of blemishes.
- the HLB value of the first surfactant is preferably from 10.5 to 13.5, and more preferably from 11.0 to 13.0.
- the HLB value of the second surfactant is preferably 16.5 to 18.3, more preferably 17.0 to: L8.0.
- the HLB value (average HLB value) of these surfactants in combination is preferably 15.5 to 17.5, more preferably 16 to L7.5.
- nonionic surfactants are preferable, and in particular, those obtained by adding (poly) ethylene oxide to an alkyl alcohol, an alkylphenyl alcohol, a higher fatty acid, or the like and bonding them are preferable.
- nonionic NS—208.5 HLB 12.6
- NS-206 HLB 10.9
- HS—208 manufactured by NOF Corporation as polyoxyethylene alkylphenol-based compounds are used.
- HLB 12.6 HS-210
- Sanyo Chemical Oku-Yupole 60 HLB 11.3)
- Oku-Yupole 80 HLB 12.4
- Okutapol 95 HB 13.3)
- Octapol 100 HB 13.6
- Dodecapol 90 HLB 12.0
- Dodecapol 120 HB 13.4
- Nonionic P made by NOF Corporation as a polyoxyethylene alkyl ether compound — 210 HB 12.9)
- Sanyo Kasei's nonipole software SS—50 (HLB 10.5)
- SS—70 HB 12.8)
- SS—90 HB 13.2
- DO-70 HB 12.3)
- DO-90 HB 13.4)
- Nonionic L-4 HB 13.1)
- S-4 HLB 11. 6
- nonionic NS-230 (HLB 17.2), NS-240 (HLB 17.8), HS-220 ( HLB 16.2), HS-240 (HLB 17.9), Sanyo Chemical Nonipol 200 (HLB 16.0), Nonipol 400 (HLB 17.8), Nonipol 500 (HLB 18.2), Octa Poll 400 (HLB 17.9), Nonionic E-230 (HLB 16.6), K-220 (HLB 16.2), K-230 (HLB 17) manufactured by NOF as polyoxyethylene alkyl ether compounds 3), Nonionic S—15.4 (HLB 16.7) and S—40 (HLB 18.2) manufactured by NOF Corporation as polyoxyethylene ester compounds of higher fatty acids.
- the first surfactant is used in an amount of preferably 0.1 to 15% by weight, more preferably 0.65 to 10% by weight, particularly preferably 0.85 to 5% by weight, based on the solid content of the coating liquid.
- the second surfactant is used in an amount of preferably 10 to 40% by weight, more preferably 12 to 36% by weight, particularly preferably 15 to 30% by weight, based on the solid content of the coating liquid.
- the HLB value of the first surfactant is less than 10 or the amount exceeds 15% by weight (based on the total solid content of the coating layer B), foaming tends to occur when the coating solution is applied, and A coating defect is formed.
- the HLB value exceeds 14 or the amount used is less than 0.5% by weight (equivalent to the total solid content of the coating layer B)
- the effect of lowering the surface tension of the coating solution is reduced, so that the coating solution is not used.
- the HLB value of the second surfactant is less than 16 or the amount used is less than 10% by weight (based on the total solid content of the coating layer B), it is possible to suppress the generation of projections that may cause dropout. On the other hand, if the HLB value exceeds 18.5, coating omission occurs, and if the usage amount exceeds 40% by weight (per the total solid content of the coating layer B), streaky coating defects due to foaming occur. .
- the coating layer B in the present invention can be formed by coating and drying on at least one surface of the aromatic polyamide base film A as a coating liquid containing an inert fine particle surfactant and a binder resin, preferably a water-soluble coating liquid. it can.
- the solid content concentration of this coating liquid is preferably 0.2 to 10% by weight, more preferably 0.5 to 5% by weight, and particularly preferably 0.7 to 3% by weight.
- the coating liquid, preferably a water-soluble coating liquid may optionally contain other components such as a surfactant, as long as the effects of the present invention are not impaired. Agents, stabilizers, dispersants, UV absorbers, thickeners and the like can be added.
- the coating is preferably performed on the aromatic polyamide film after stretching and heat treatment described below so as not to excessively heat the coating film.
- the condition for drying the coating film after application is preferably that the film is passed through a drying oven at 30 to 300 ° C. for 1 second to 30 minutes.
- the coating method is not particularly limited, and examples thereof include a roll coating method and a die coating method.
- the second aromatic polyamide film of the present invention is formed on the surface of the coating layer B by a method such as vacuum deposition, sputtering, or ion plating.
- a magnetic metal thin film layer is formed, and a protective layer of diamond-like carbon (DLC) or the like, a fluorine-containing carboxylic acid-based lubricating layer is sequentially provided on the surface of the magnetic metal thin film layer if necessary, and a surface of the coating layer B is further provided.
- DLC diamond-like carbon
- a fluorine-containing carboxylic acid-based lubricating layer is sequentially provided on the surface of the magnetic metal thin film layer if necessary, and a surface of the coating layer B is further provided.
- the third aromatic polyamide film comprises a laminated base film (A 1) and a second coating layer (B).
- the laminated base film (A 1) comprises a biaxially oriented aromatic polyamide film and a first coating layer on one surface thereof. This first coating layer achieves easy transportability of the third aromatic polyamide film.
- the present invention as a means for substantially preventing inert fine particles from being contained, for example, in the step of adding a neutralizing agent in the method for producing an aromatic polyamide, Adjusting the amount of neutralizing agent added to reduce the particle size to zero, reducing the particle size, adjusting the pH of the reaction system to the acidic side, or increasing the reaction time be able to.
- the means for reducing the particle size of the inert fine particles is not particularly limited, either. For example, after dispersing the particles in a solvent, pulverize the powder using a device such as a sand grinder, and filter the dispersion to obtain coarse particles. Can be implemented.
- the inert fine particles are not contained in the film, a film flatness for good electromagnetic conversion characteristics is obtained, and a good running property is obtained by the particle-containing coating layer described later. This is preferable for applications that require compatibility between flatness and appropriate roughness for durability, such as recording media.
- a thin first coating layer is provided on one surface of the aromatic polyamide film for the purpose of ensuring transportability, and a second coating layer is provided on the opposite surface.
- the coating layer is preferably applied to the aromatic polyamide film after stretching and heat treatment so that the applied film is not excessively heated. After coating, the coating film is dried.
- the drying conditions are preferably 1 O to 10 seconds through a drying oven at 3 O: 2230 ° C.
- the coating method is not particularly limited, but examples thereof include a roll coating method and a die coating method.
- the application sequence is not limited, but it is preferable that the application be performed almost simultaneously before and after, and both sides be dried simultaneously.
- an aromatic polyamide film having an extremely flat surface because it contains substantially no particles is directly applied to a guide roll or the like during a film forming process and a processing process.
- the aromatic polyamide film has extremely poor slipperiness, and causes troubles such as shearing and cutting.
- the air bleeding property and the slipperiness between the films are deteriorated, it is difficult to obtain a film roll having a good winding shape.
- the blocking phenomenon is likely to occur.
- the average particle size (dx) of the inert fine particles X contained in the first coating layer is from l to 300 nm, preferably from 5 to 250 nm, particularly preferably from 10 to 200 nm. . If the average particle diameter dX of the inert fine particles X is less than 1 nm, the effect of imparting slip properties cannot be obtained, while if it exceeds 300 nm, the electromagnetic conversion characteristics of the magnetic tape deteriorate.
- the content of the inert fine particles X in the first coating layer is preferably 0.01 to 45% by weight, more preferably 1 to 40% by weight, and particularly preferably 2 to 35% by weight. If the content of the inert fine particles X is less than 0.01% by weight, the density of the projections formed is too low to improve the slipperiness. On the other hand, if the content exceeds 45% by weight, the inert fine particles falling off the coating film may be reduced. It increases the number of processes and makes the process dirty.
- the type of the inert fine particles X contained in the first coating layer is not particularly limited, but is preferably a material having a relatively low specific gravity that does not easily settle in the coating liquid.
- particles made of a heat-resistant polymer eg, a crosslinked silicone resin, a crosslinked acrylic resin, a crosslinked polystyrene, a melamine-formaldehyde resin, an aromatic polyamide resin, a polyamideimide resin, a crosslinked polyester, a wholly aromatic polyester, etc.
- silicon dioxide Silicon dioxide
- core shell particles in which the outside is softer than the inside, are preferably used.
- core-shell particles the core-shell particles described for the first aromatic polyamide film are also used here.
- the shape of the inert fine particles X is not particularly limited, but a spherical shape or a shape close to a spherical shape is advantageous in that efficient projections are formed.
- the inert fine particles X preferably have a narrow particle size distribution, and for example, have a relative standard deviation of 0.5 or less, more preferably 0.3 or less, and particularly preferably 0.2 or less. If the relative standard deviation of the particle size distribution is larger than 0.5, the formed surface becomes too rough, which adversely affects the electromagnetic conversion characteristics. It is easy to fall off and causes dropout when used as a magnetic tape.
- a binder resin is used to fix the inert fine particles X.
- the binder resin for example, an aqueous polyester resin, an aqueous acryl resin, an aqueous polyester resin, and the like are preferable, and an aqueous polyester resin is particularly preferable.
- Binder resin and aqueous polyester resin It is understood that items not described here apply to the items described for the second aromatic polyamide film.
- the thickness (t A ) of the first coating layer is dxZlOO (nm) or more and less than dX (nm), preferably dxZ50 (nm) or more and less than dx (nm), and more preferably dxZ30 (nm). ) And less than dx (nm).
- t lambda is less than d xZl OO (nm)
- it is difficult to retain the inert fine particles in the first coating layer in the coating would cause the dropping of inert particles as a result.
- the thickness of the coating alone is less than dxZ100 (nm) without increasing the content, the distance between the inactive fine particles becomes too large, and the slipperiness and blocking resistance deteriorate.
- the thickness is dx (nm) or more, the effect of improving inertness by the inert fine particles X is not sufficiently exhibited. Further, as the thickness is too thick, the number of contained particles (in the thickness direction) increases, so that the push-up phenomenon in the calendering process is more likely to occur.
- a second coating layer containing two kinds of inert fine particles having different average particle sizes, Z and Z is provided on the other surface of the aromatic polyamide film.
- the average particle diameter dy of the inert fine particles Y having a large average particle diameter is 100 to 1,000 nm, preferably 105 to 800 nm, and particularly preferably. Is from 110 to 500 nm, and the average particle size dz of the inert fine particles Z having a small average particle size is from 5 to 100 nm, preferably from 10 to 95 nm, particularly preferably from 15 to 90 nm.
- the ratio (dyZdz) of these average particle diameters is 1.2 or more, preferably 1.3 or more, particularly preferably 1.4 or more.
- the upper limit of this ratio is not particularly limited, but is preferably 100 or less from the particle size range of the inert fine particles Y and the inert fine particles Z and the thickness of the coating.
- the average particle diameter dy of the inert fine particles Y is less than 10 Onm, it is not possible to form a space between the films so as to eliminate air entrained when the film is wound into a roll. Problems such as lateral displacement and wrinkling occur.
- the average particle diameter dy of the inert fine particles Y exceeds 1,00 Onm, the inert fine particles Y may easily fall off the second coating layer, and may be formed during the film forming process or during processing. A problem arises in that the rollers that come into contact during the process are soiled. In addition, push-up phenomena during the calendaring are likely to occur.
- the average particle diameter dz of the inert fine particles Z is less than 5 nm, it is impossible to improve the slipperiness between the films. Also worsens.
- the average particle diameter d z force of the inert fine particles Z exceeds 100 nm, the roll appearance of the film roll is deteriorated and the blocking resistance is also deteriorated.
- the average particle size ratio (dy / dz) is less than 1.2, the height of the projections formed on the second coating layer becomes nearly uniform, so that sufficient air bleeding property can be secured. Disappears.
- the content of the inert fine particles Y in the second coating layer is 0.01 to 40% by weight, preferably 0.05 to 35% by weight, particularly preferably 0.1 to 30% by weight. .
- the content of inert fine particles Z is from 1 to 70% by weight, preferably from 5 to 60% by weight, particularly preferably from 7 to 50% by weight.
- the total content of the inert fine particles Y and the inert fine particles Z in the second coating layer is 75% by weight or less, preferably 65% by weight or less, and particularly preferably 60% by weight or less.
- the lower limit of the total content is preferably 1% by weight, more preferably 3% by weight, particularly preferably 5% by weight.
- the content of the inert fine particles Y is less than 0.01% by weight, the densities of the projections are too small, and the films adhere to each other, and the entrapped air is not eliminated. Many particles fall off from the surface, and the process becomes dirty.
- the content of the inert fine particles Z is less than 1% by weight, the slipping property between the films deteriorates, so that the roll appearance of the film roll deteriorates. Will fall off. If the total content of the inert fine particles Y and the inert fine particles Z exceeds 75% by weight, the ratio of the resin to the resin becomes too small, and the inert fine particles are extremely likely to fall off.
- the type of the two kinds of inert fine particles ⁇ and Z contained in the second coating layer is not particularly limited, but those having a relatively low specific gravity, which hardly settle in the coating liquid, are preferable.
- heat-resistant polymers for example, cross-linked silicone resin, cross-linked acrylic resin, cross-linked polystyrene, melamine, formaldehyde resin, aromatic polyamide resin, polyamide-imide resin Fat, cross-linked polyester, wholly aromatic polyester, etc.
- silicon dioxide (silica), calcium carbonate and the like silicon dioxide (silica), calcium carbonate and the like.
- the types of the inert fine particles Y and the inert fine particles Z may be the same or different.
- the shapes of the two types of inert fine particles Y and ⁇ ⁇ are not particularly limited, but those having a spherical shape or a shape close to a sphere are advantageous in that they form efficient projections.
- the inert fine particles preferably have a narrow particle size distribution, for example, a relative standard deviation of 0.5 or less, more preferably 0.3 or less, and particularly preferably 0.2 or less. If the relative standard deviation of the particle size distribution is greater than 0.5, the inert fine particles are liable to fall off when coming into contact with the pass rolls during the manufacturing process. Cause.
- a binder resin is used to fix the two kinds of inert fine particles described above.
- the binder resin the same resin as the binder resin of the first coating layer can be preferably used.
- the kind of the binder resin may be the same for the first coating layer and the second coating layer, or may be different.
- the thickness (t B ) of the second coating layer is 4 (nm) or more and less than dz (nm).
- the thickness is less than 4 (nm)
- the content of the inert fine particles Y and the inert fine particles Z is constant, and when only the thickness of the second coating layer is reduced, the distance between the inert fine particles becomes too large, resulting in slipperiness and air leakage. Properties and blocking resistance are reduced.
- the thickness of the second coating layer is greater than or equal to the average particle size dz of the inert fine particles Z in the second coating layer, the effect of improving the slipperiness and the anti-blocking property by adding the inert fine particles Z is not sufficiently exhibited. . Furthermore, the thicker the second coating layer, the greater the number of inert particles to be contained (in the thickness direction), so that the phenomenon of protrusion in the calendar process is likely to occur, resulting in a magnetic tape. Have poor electromagnetic conversion characteristics.
- the first coating layer is formed by applying a coating liquid containing the above-mentioned inert fine particles X and a binder resin to one surface of the aromatic polyamide film, preferably an aqueous coating liquid.
- the second coating layer is formed by applying a coating liquid containing the above-mentioned inactive fine particles ⁇ , ⁇ and a binder resin, preferably an aqueous coating liquid, to the other surface of the film, followed by drying.
- the solid content concentration of each coating liquid is 1 to; L 0 wt%, more preferably 1.5 to 8 wt%, and particularly preferably 2 to 6 wt%.
- the thus obtained third aromatic polyamide film of the present invention has a friction coefficient between the first coating layer surface and the second coating layer surface of 0.6 or less, and an air bleeding index of 6.0000 seconds or less, and particularly , 000 seconds or less. Thereby, when the third aromatic polyamide film is wound into a roll, a film roll having a better winding shape can be obtained.
- the third aromatic polyamide film which is easily transportable according to the present invention, has excellent transportability in a film forming process and a processing process, has an extremely flat surface and excellent winding property, and has a severe processing condition such as Even under force render conditions, the running surface side particles do not protrude to the opposite surface, and are extremely useful in magnetic and other applications, and are particularly suitable as base films for vapor deposition type high density magnetic recording media.
- This vapor-deposited magnetic recording medium is extremely useful as a tape medium for Hi8 for analog signal recording, a digital video cassette recorder (DVC) for digital signal recording, 8 mm / day, DDSIV.
- the fourth aromatic polyamide film of the present invention is composed of an aromatic polyamide base film (A 2) containing internal inert fine particles and a second coating layer (B).
- the aromatic polyamide base film according to the present invention has an average particle size in the film of 5 to 1,500 nm, preferably 10 to 1,300 nm, and more preferably 30 to: L, 0. Contains internal inert microparticles of 100 nm.
- M 1 (OH) x is a metal element of Group Ia of the periodic table or a metal element of Group a of the periodic table, and X is 1 or 2, or a compound represented by the following formula (3):
- M 1 is the same as above and y is 1/2 or 1.
- These internal inert fine particles are obtained as a residue of the neutralizing agent in the aromatic polyamide polymerization step, and are sufficiently dispersed in the system at the stage of the polymerization step, so that particles that may cause shavings are removed. There is no fear of aggregation. If the average particle size in the film is less than 5 nm, the effect of forming the surface projections by the particles is small, and sufficient handling properties such as slipperiness and winding property cannot be obtained. On the other hand, if the average particle size exceeds 1,500 nm, the voids formed by stretching become too large, and the abrasion resistance may be poor.
- the inorganic particles have an average particle size of 10 to 300 nm, preferably 30 to 1,500 nm when added as a neutralizing agent. If the average particle size is less than 10 nm, the effect of forming surface projections by the particles is small, and sufficient handling properties such as easy slippage and winding property cannot be obtained. On the other hand, if the average particle size exceeds 3,000 nm, the particle size of the residue after the neutralization reaction becomes large, and the voids formed by stretching become too large, which may result in poor abrasion resistance. Absent.
- the internal inert fine particles are preferably used in an amount of the above formula (2) or an amount exceeding the stoichiometric amount used for producing an aromatic polyamide by an acid chloride method and for neutralizing hydrogen chloride produced as a by-product. It is derived from the compound of (3).
- the means by which the average particle size of the inorganic particles in the film satisfies the above-mentioned range is not particularly limited, but, for example, in the neutralizing agent adding step, the pH of the reaction system is adjusted to the above range.
- a preferred method is to adjust the amount of the neutralizing agent added and the particle size so as to give an appropriate average particle size.
- Means for adjusting the particle size of the inorganic particles is also not particularly limited, for example, A preferred method is to disperse the particles in a solvent, pulverize the particles using a device such as a sand grinder, and filter the dispersion to remove coarse particles.
- the inorganic particles When the inorganic particles are contained so that the projection density of the film surface is 1 ⁇ 10 2 to 1 ⁇ 10 8 mm 2 , good electromagnetic conversion characteristics such as a magnetic recording medium are obtained. This is preferable for applications that require compatibility between flatness and good running performance, durability, and moderate roughness.
- the polymerization solvent is selected from dimethylformamide, dimethylacetamide, N-methylpyrrolidone, N-methylcaprolactam, dimethylsulfoxide, hexamethylphosphoryltriamide, tetramethylurea, 1,3-dimethyl-2-imidazolidinone, and the like. At least one of them can be used as a main component. At this time, for the purpose of improving the solubility of the polymer, an appropriate amount of an inorganic salt such as calcium chloride or lithium chloride may be added before, during, or at the end of the polymerization.
- an inorganic salt such as calcium chloride or lithium chloride may be added before, during, or at the end of the polymerization.
- the acid component and the amine component are reacted in substantially equimolar amounts, but any one of the components can be used in excess for the purpose of controlling the degree of polymerization. Further, a small amount of a monofunctional acid component or an amine component may be used as a terminal blocking agent. Further, an aliphatic or aromatic amine or a quaternary ammonium salt can be added to the polymerization system in order to capture hydrogen chloride generated by the reaction. Further, as long as the effects of the present invention are not impaired, an ultraviolet absorber, a dye, a release agent, and other agents may be added. After the end of the reaction,
- a neutralization reaction is carried out by adding 10-3, 000 nm, preferably 30-: L, 50,000 nm of inorganic particles represented by the above formula (2) or (3).
- a second coating layer is provided on one surface of the surface of the aromatic polyamide base film of the present invention.
- the coating is preferably performed on the aromatic polyamide film after stretching and heat treatment so that the coating film is not excessively heated, and the coating film is preferably dried after the coating. Drying conditions are preferably passed through a drying oven at 30 ° C to 230 ° C for 1 second to 10 seconds.
- the coating method is not particularly limited, but examples thereof include a roll coating method and a die coating method.
- the easily transportable fourth aromatic polyamide film of the present invention has excellent transportability in the film-forming process and the coating process, has an extremely flat surface, has excellent winding properties, and is subjected to severe processing. Under conditions such as a single calendar condition, the particles on the running surface do not protrude to the opposite surface, which is extremely useful for magnetic applications and other applications, and is particularly suitable as a base film for a coating type high density magnetic recording medium.
- Average particle size I (average particle size: 0.0 or more)
- the measurement is performed using a Shimadzu CP-50 type centrifugal particle size analyzer (Centrifuga lParrticlESiSeAnal1yzer). From the integrated curve of particles of each particle size and its abundance calculated based on the obtained centrifugal sedimentation curve, read the “equivalent sphere diameter” corresponding to 50% by weight, and use this value as the average particle size. (See “Granularity measurement technology”, published by Nikkan Kogyo Shimbun, 1975, pp. 242 to 247).
- Particles having an average particle size of less than 0.0 that form small projections are measured using a light scattering method.
- the “equivalent sphere diameter” of particles at 50% by weight of all particles determined by NI COMP MODEL 270 SUBM I CRON PART I CLE SI ZER manufactured by Nicom Inst rumen ts Inc. I do.
- a photograph of each particle was taken with a scanning electron microscope at a magnification corresponding to the size used, and the image analysis processor Luzex 500 (manufactured by Nippon Regiyure Ichiyuichi) was used to determine the particle size. Calculate the average particle size and volume of the particles, and calculate by the following formula (6).
- V is the volume of the particle (im 3 ), and R is the average particle size of the particle (Aim)
- the measurement of the projection density on the film surface is performed by a scanning electron microscope. That is, randomly shot 25 Like the surface photograph of the B layer of the full Ilm at a magnification of 5, 000 times, counts the surface protrusions density, in terms of the number of projections and the average value by Li lmm 2 per this value The density of protrusions on the surface of layer B is assumed.
- ARa center plane average roughness
- Measurement environment room temperature, in air
- ⁇ is the Young's modulus (kg / mm 2 )
- ⁇ is the stress difference due to the original average cross-sectional area between two points on the straight line
- ⁇ £ is the strain difference between the same two points. is there.
- two layers of 100% cobalt ferromagnetic thin film are formed by vacuum evaporation to a thickness of 0.2 m, and the diamond-like force is applied to the surface.
- a monocarbon (DLC) film and a fluorine-containing carboxylic acid-based lubricating layer are sequentially provided, and a back coat layer is provided on the surface of the aromatic polyamide film opposite to the layer B by a known method. After that, slit it to 8mm width and load it on a commercially available 8mm video cassette. Next, the properties of the tape are measured using the following commercially available equipment.
- a 4.2MHz video signal is recorded on the above-mentioned vapor-deposited tape, and the tape runs at a speed of 4 lm / min and a rewind speed of 4 lm / min once at 25 ° C and 50% RH. And examine the output fluctuations after a total of 200 repetitions. Judgment is made based on the following criteria from this output fluctuation.
- NMP N-methylpyrrolidone
- parafene didiamine 25 mole% of parafene didiamine
- 25 mole% of 3,4'-diaminodiphenyl ether 25 mole% of 3,4'-diaminodiphenyl ether
- 50 mole% of terephthalic acid chloride 50 mole% of terephthalic acid chloride as the acid component
- the polymer was polymerized and neutralized with calcium hydroxide to obtain a polymer solution (logarithmic viscosity 3.5), which was used as a film forming stock solution.
- This undiluted solution was cast on a metal belt at 100 ° C, dried at 100 ° C for 2 minutes, and then gradually heated to 120 ° C. After drying for 5 minutes, a self-holding unstretched film was obtained. The stretched film was continuously peeled off from the belt, introduced into a water tank, and desolvated and desalted.
- the obtained stretched film is stretched 2.5 times in the longitudinal direction between the low-speed and high-speed rolls at a film temperature of 350, then supplied to a tenter, and stretched 3.0 times in the width direction at 400 ° C.
- the obtained biaxially stretched film was heat-treated at 400 ° C. for 1 minute, and cooled to room temperature to obtain a film A.
- This film A is obtained by dispersing particles of a resin (cross-linked acrylic) obtained by cross-linking polymethyl methacrylate having an average particle size of 30 nm with divinylbenzene in an aqueous solution of a binder made of an acrylic-modified polyester resin.
- An aromatic polyamide base film was obtained in the same manner as in Example 1, except that the stretching ratio of the film A was changed to that shown in Table 1.
- Table 1 shows the characteristics of the obtained film and the magnetic tape deposited with a ferromagnetic metal thin film using this film.
- An aromatic polyamide base film was obtained in the same manner as in Example 1, except that the type of particles in the coating layer B and / or the content of particles in the total solid content were changed to those shown in Table 1.
- Table 1 shows the properties of the obtained film and the magnetic tape on which the ferromagnetic metal thin film was deposited using this film.
- Example 1 25/25 mol% 2500 kg / mra 2 Acr-Pes If acrylic 30 nm 2. Owt% 1. Ot3 ⁇ 4
- Example 2 25/25 mol% 2350 kg / mm 2 Acr-Pes 3 ⁇ 41 acrylic 30 nm 2.Owt3 ⁇ 4 1.Owt3 ⁇ 4
- Example 4 25/25 mol% 2500 kg / mm 2 Acr-Pes 3 ⁇ 4l acrylic 60 nm 16. Owt% 1. Owt3 ⁇ 4
- Example 7 25/25 mol% 2500 kg / mm 2 Acr-Pes 30 nm 2. Owt% 1. Owt3 ⁇ 4
- Example 8 25/25 mol% 2500 kg / mm 2 Acr-Pes silica 45 nm 2.
- Owt3 ⁇ 4 1.
- Example 1 1.35 g / m 2 lOnm 0.33 2.2 nm 1.6 nm 0.27
- Example 3 1.35 g / m 2 lOnm 0.33 2.4 nm 1.7 nm 0.29 ⁇ ⁇
- Example 7 1.35 / m 2 lOnm 0.33 0.8nm 0.64
- Example 8 1.35 g / m 2 lOnm 0.22 3.7 nm 3.5 nm 0.05 ⁇
- Example 9 1.35 g / m 2 lOnm 0.67 1.3 nm 1.nm 0.08
- An aromatic polyamide base film was obtained in the same manner as in Example 1 except that the coating solution solid concentration or the coating amount for the coating layer B was changed to those shown in Table 2.
- Table 2 shows the properties of the obtained film and the magnetic tape deposited with a ferromagnetic metal thin film using this film.
- An aromatic polyamide base film was obtained in the same manner as in Example 1, except that the binder resin in the coating layer B was changed to that shown in Table 2.
- Table 2 shows the properties of the obtained film and the magnetic tape deposited with a ferromagnetic metal thin film using this film.
- An aromatic polyamide base film was obtained in the same manner as in Example 1, except that the copolymer composition of the amine component of the aromatic polyamide of the film A was changed to that shown in Table 2.
- Table 2 shows the characteristics of the obtained film and the magnetic tape on which the ferromagnetic metal thin film was deposited using this film.
- Example 10 25/25 mol% 2500 kg / mm 2 Acr-Pes ⁇ Acrylic 30 nm 2.0 wt 2.0 t ⁇
- Example 1 1 25/25 mol% 2500kg / mm z Acr-Pes crosslinked acrylic 30nm 2.0wt3 ⁇ 4 0.5wt3 ⁇ 4
- Example 1 2 25/25 mol% 2500 kg / mm 2 Acr-Pes crosslinked) 7 krill 30 nm 2.0 wt3 ⁇ 4 1.0 wt3 ⁇ 4
- Example 1 3 25/25 mol% 2500 kg / mm z Acr-Pes acrylic 30 nm 2.0 wt3 ⁇ 4 1.0 wt3 ⁇ 4
- Example 1 4 25/25 mol% 2500 kg / mm 2 Pes Cross-linked acrylic 30nra 2.0wt% 1.0wt%
- Example 1 5 25/25 mol% 2500kg / mm z Pur crosslinked acrylic 30nm 2.0 t3 ⁇ 4 1.0wt%
- an aromatic compound was prepared in the same manner as in Example 1 except that silica having an average particle diameter of 40 nm previously dispersed in NMP was added to the polymerization system to form a stock solution.
- a polyamide base film was obtained.
- Table 3 shows the properties of the obtained film and the magnetic tape deposited with a ferromagnetic metal thin film using this film. This film had poor surface smoothness due to large projections caused by particles inside the film, especially coarse projections caused by particle aggregates, and had poor electromagnetic conversion characteristics.
- An aromatic polyamide film was obtained in the same manner as in Example 1, except that the dried unstretched film was not stretched.
- Table 3 shows the properties of the obtained film and the magnetic tape deposited with a ferromagnetic metal thin film using this film. This unstretched film had poor Young's modulus and thus poor electromagnetic conversion characteristics.
- An aromatic polyamide base film was obtained in the same manner as in Example 1, except that the coating of the coating layer B was not performed.
- Table 3 shows the properties of the obtained film and the magnetic tape with a ferromagnetic four metal thin film deposited using this film. This film without fine projections was inferior in running durability.
- An aromatic polyamide base film was obtained in the same manner as in Example 1, except that no particles were contained in the coating layer B.
- Table 3 shows the properties of the obtained film and the magnetic tape deposited with a strong magnetic thin metal film using this film. This film without fine projections had poor running durability.
- Aroma was conducted in the same manner as in Example 1 except that the type of particles in the coating layer B and / or the particle content in the total solid content and the Z or the solid content and / or the coating amount of the coating liquid were changed to those shown in Table 3.
- An aromatic polyamide base film was obtained.
- Table 3 shows the properties of the obtained film and the magnetic tape deposited with a ferromagnetic metal thin film using this film. This film, whose particle size and / or protrusion density is outside the scope of the present invention, Poor properties or running durability
- Comparative Example 1 contains 43 ⁇ ⁇ silica particles in the film
- Shell part polymethyl methacrylate core-shell type particles
- Shell part polymethyl methacrylate silica ⁇ colloidal silica
- the base film has sufficient strength and rigidity, and particularly has good electromagnetic conversion characteristics, dropout, and running durability of the magnetic layer.
- An aromatic polyamide film useful as a base film for an excellent high-density magnetic recording medium can be provided.
- Average particle size of particles I Average particle size: 0.006 111 or more
- Average particle diameter I I (average particle diameter: less than 0.06 / zm)
- M is the molecular weight of the surfactant
- Mn is the molecular weight of the hydrophilic moiety
- HLB value HLB (X) XP (X) + HLB (Y) XP (Y) ... (9) where, HLB (X); HLB value of the first surfactant X
- HLB (Y) HLB value of the second surfactant Y
- the measurement of the projection density on the film surface is performed by a scanning electron microscope. That is, 25 photographs of the surface of the coating layer B of the laminated film were taken at random at a magnification of 35,000 times, the surface projection density was counted, and the average value was converted into the number of projections per 1 mm 2 .
- the value is defined as the protrusion density of the inert fine particles on the surface of the coating layer B.
- the equipment used to manufacture and use the magnetic tape is the same as (8) above.
- a signal with a recording wavelength of 0.5 im (frequency of about 7.4 MHz) is recorded, and the reproduced signal is recorded.
- the ratio between the 6.4 MHz and 7.4 MHz values of the signal is defined as the CZN of the tape, and the CZN of the commercially available 8mm video evaporation tape is defined as 0 dB.
- a 4.2MHz video signal was recorded on the above-mentioned vapor-deposited tape.
- This stock solution is cast on a metal belt at 100 ° C, dried at 100 ° C for 2 minutes, and then gradually increased in temperature to 120 ° C and 150 ° C, and dried for a total of 10 minutes to have a self-holding property
- An unstretched film was obtained.
- the stretched film was continuously peeled off from the belt, introduced into a water tank, and desolvated and desalted.
- the obtained stretched film is stretched 2.5 times at a film temperature of 350 ° C between low-speed and high-speed rolls, and then supplied to a stenter and stretched 3.0 times at 400 ° C.
- the biaxially stretched film was heat-treated at 400 ° C for 1 minute, and cooled to room temperature to obtain a film A.
- Binder Acrylic modified polyester (Takamatsu Yushi IN-170-6).
- Inert microparticles Cross-linked polymethyl methacrylate-divinylbenzene (Nippon Shokubai Kagaku Kogyo Co., Ltd. ME poster) Average particle size 30 nm.
- Surfactant X 2% by weight of polyoxyethylene alkyl phenyl ether (NS-208.5, manufactured by NOF Corporation), HLB 12.6.
- Surfactant Y 28% by weight of polyoxyethylene alkyl phenyl ether (NS-230 manufactured by NOF Corporation), HLB 17.2
- An aromatic polyamide base film was obtained in the same manner as in Example 18, except that the stretching ratio of the film A was changed to that shown in Table 4.
- Table 4 shows the properties of the obtained film and the magnetic tape deposited with a ferromagnetic metal thin film using this film.
- Example 20 S AA2 17.2 28wt3 ⁇ 4 16.9 ⁇ ⁇ ⁇ ⁇ / Country 2 ⁇
- Example 1 except that the type of particles in the coating layer B was changed to those shown in Table 5 and the particle density in Z or the total solid content was changed, and the protrusion density of the coating layer B was changed to those shown in Table 5.
- an aromatic polyamide base film was obtained.
- Table 5 shows the properties of the obtained film and the magnetic tape deposited with a ferromagnetic metal thin film using this film.
- An aromatic polyamide-based film was obtained in the same manner as in Example 18 except that the binder resin in the coating layer B was changed to that shown in Table 5, and the surfactant composition shown in Table 5 was changed accordingly.
- Table 5 shows the properties of the obtained film and the magnetic tape deposited with a ferromagnetic metal thin film using this film.
- An aromatic polyamide base film was obtained in the same manner as in Example 18 except that the copolymer composition of the amine component of the aromatic polyamide in the film A was changed to that shown in Table 5.
- Table 5 shows the characteristics of the obtained film and the magnetic tape deposited with a ferromagnetic metal thin film using this film.
- Example 2 3 25/25 mol% 2500 kg / mm 2 Acr-Pes Cross-linked acrylic 60 belly S AA 1 12.6 2 wt%
- Example 24 25/25 mol% 2500 kg / Kan 2 Acr-Pes Crosslinked acrylic 15nra SAA 1 12.6 2wt%
- Example 2 5 25/25 mol% 2500 kg / mm 2 Acr-Pes 30 nm S AA 1 12.6 2 wt%
- Example 26 25/25 mol% 2500 kg / mm 2 Acr-Pes 30 nm SAA 1 12.6 2 wt%
- Example 27 25/25 mol% 2500 kg / mm 2 Acr-Pes silica 45 nm SAA 1 12.6 2 wt%
- Example 28 25/25 mol% 2500 kg / mm 2 Acr-Pes silica 15 nm SAA 1 12.6 2 wt%
- Example 29 25/25 mol% 2500 kg / image 2 Pes cross-linked acrylic 30 nm SAA 1 12.6 4 wt%
- Example 30 25/25 mol% 2500 kg / mm 2 Pur cross-linked acrylic 30 nm SAA 1 12.6 2 wt%
- Example 18 After completion of the neutralization reaction in the polymerization step, the same procedure as in Example 18 was carried out, except that silica having an average particle diameter of 160 nm previously dispersed in NMP was added to the polymerization system to form a stock solution. An aromatic polyamide base film was obtained. Table 6 shows the properties of the obtained film and the magnetic tape on which the ferromagnetic metal thin film was deposited using this film. This film had poor surface smoothness due to large projections caused by particles inside the film, particularly coarse projections caused by particle agglomerates, and had poor electromagnetic conversion characteristics.
- An aromatic polyamide base film was obtained in the same manner as in Example 18 except that the dried unstretched film was not stretched.
- Table 6 shows the properties of the obtained film and the magnetic tape deposited with a ferromagnetic metal thin film using this film. This unstretched film had poor Young's modulus and therefore poor electromagnetic conversion characteristics.
- An aromatic polyamide base film was obtained in the same manner as in Example 18 except that the coating layer B was not applied.
- Table 6 shows the properties of the obtained film and the magnetic tape deposited with a ferromagnetic metal thin film using this film. This film without fine projections had poor running durability.
- An aromatic polyamide base film was obtained in the same manner as in Example 18 except that no particles were contained in the coating layer B.
- Table 6 shows the characteristics of the obtained film and the magnetic tape on which the ferromagnetic metal thin film was deposited using this film. This film without fine projections had poor running durability.
- An aromatic polyamide-based film was obtained in the same manner as in Example 18 except that the type and / or content of the first surfactant X and / or the second surfactant Y was changed to those shown in Table 6. .
- Table 6 shows the properties of the obtained film and the magnetic tape deposited with a ferromagnetic metal thin film using this film.
- Comparative Example 1 1 25/25 mol% 1200 kg / Yuzuru 2 Acr - Pes ⁇ / acrylic oUnm AA 1 ⁇ l.6 2wt3 ⁇ 4
- Comparative Example 1 3 25/25 mol% 2500kg / dust 2 Acr-res AA 1 1 mu m 2wt3 ⁇ 4
- Comparative Example 1 25 25/25 mol% 2500kg / band 2 Acr-Pes Cross-linked acrylic 30nm S AA 1 12.6 20wt3 ⁇ 4
- Comparative Example 1 25/25 mol% 2500 kg / Yuzuru 2 Acr - Pes crosslinked acrylic 30nm S AA 1 12.6 2wt%
- Comparative Example 1 8 25/25 mol% 2500kg / band 2 Acr-Pes Cross-linked acrylic 30 ⁇ S AA 1 12.6 2wt%
- Comparative Example 10 contains 16 ⁇ ⁇ ⁇ silica particles in the film
- Shell part polymethyl methacrylate silica ⁇ colloidal silica
- SAA4 Polyoxetylene alkylphenol (Nippon Yushi Co., Ltd., NS 270).
- the film according to the present invention has excellent electromagnetic conversion characteristics, excellent running durability, and extremely few microprojections that cause dropout. There are no defects such as coating omissions and coating streaks, and the rollability is excellent. On the other hand, those which do not satisfy the requirements of the present invention have these characteristics. Cannot be satisfied at the same time.
- the surface of the coating layer B has no protrusions that cause dropout, and is useful for manufacturing a magnetic recording medium having excellent electromagnetic conversion characteristics and running properties.
- a laminated film for a high-density magnetic recording medium can be provided.
- the polymer stock solution containing the aromatic polyamide after polymerization was poured into a solvent such as alcohol or water, and the reprecipitated and separated polymer was determined from the value measured at 30 in concentrated sulfuric acid.
- a small piece of the film is fixedly molded with epoxy resin, and an ultrathin section (cut parallel to the film flow direction) with a thickness of about 6 Onm is made with a microtome. This sample is observed with a transmission electron microscope (H-800, manufactured by Hitachi, Ltd.), and the thickness of each layer is determined by searching for the interface between the layers.
- the center line average roughness (Ra) is measured according to J 1 SB 601.
- a stylus type surface roughness meter (SURF CORDER SE-30C) of Kosaka Laboratory Co., Ltd. is used. Measurement under the following conditions
- Disadvantage 1 The roll end face is out of alignment.
- Disadvantage 2 There are three or more protrusions on the roll surface.
- Disadvantage 3 The roll has vertical shear.
- Judgment ⁇ 90 or more non-defective products
- the surface of the coating film (layer A) and the surface of the coating film (layer B) of the two films are overlapped, and a pressure of 50 kgZcm 2 is applied to the film under an atmosphere of 60 ° C and 80% RH for 17 hours, and then peeled. Then, it is evaluated by the peeling force (g / 5 cm width).
- the evaluation is performed based on the following criteria based on the peeling force.
- Evaluation was performed using a three-stage mini-super-calendar (nylon roll X steel roll). At a processing temperature of 80 ° C. and a linear pressure of 200 kg / cm, the film was run for 2,000 m at a speed of 50 mZ. Judge according to the following criteria based on dirt adhering to the nylon roll of the calendar.
- the measurement is performed as follows using the apparatus shown in FIG.
- 1 is an unwinding reel
- 2 is a tension controller
- 3, 5, 6, 8, 9 and 11 are free rollers
- 4 is a tension detector (entrance)
- 7 is a stainless steel SUS304 fixing rod ( Outer diameter 5 mm (
- 10 is a tension detector (outlet)
- 12 is a guide roller
- 13 is a take-up reel.
- travel 100m at a speed of 2m / min (the entrance tension is assumed to be 40g) and judge according to the following criteria.
- thermoplastic polyurethane resin A) 15 parts by weight thermoplastic polyurethane resin
- a coating liquid of the following composition is applied to the film surface (coating (B layer) surface) opposite the magnetic recording layer.
- Coating (B layer) surface was applied as a back coat layer to a thickness of 0.8 im, dried and cut to obtain a magnetic tape.
- a signal with a recording wavelength of 0.5 m (frequency: about 7.4 MHz) is recorded, and the ratio of the 6.4 MHz to 7.4 MHz value of the reproduced signal is used as the CZN of the tape.
- Is 0 dB expressed as a relative value, and determined according to the following criteria. Judgment ⁇ 0 dB or more
- a coating liquid having the same composition as the above (a) was applied as a back coat layer to a thickness of 0.8 m on the surface of the aromatic polyamide film on the side of the coating film (layer B), and dried.
- two layers of 100% cobalt ferromagnetic thin film are formed by a vacuum evaporation method so as to have a thickness of 0.02 im.
- a diamond-like carbon (DLC) film and a fluorine-containing carboxylic acid-based lubricating layer are sequentially provided on the surface. After that, slit it to 8 mm width and load it on a commercially available 8 mm video cassette.
- DLC diamond-like carbon
- the mixture was filtered through a filter (manufactured by Nippon Pole, HDC II, aperture 20; m) to prepare an NMP slurry of calcium hydroxide having an average particle size of 800 nm.
- This slurry was added to the above polymer so as to have a pH of 3.8 to obtain a stock solution for film formation.
- the logarithmic viscosity of this stock solution was 3.5.
- the obtained film-forming stock solution is heated to 100 ° C, cast on a 100 ° C metal belt from a 100 ° C die, dried at 100 ° C for 2 minutes, and then dried at 120 ° C, 150 ° C, 180 ° C.
- the temperature was raised stepwise to ° C and dried for a total of 5 minutes to obtain an unstretched film with self-holding properties.
- This unstretched film was continuously peeled off from the belt, introduced into a water tank, desolvated and desalted, and then dried with 18 O: for 3 minutes.
- the obtained unstretched film is stretched 2.5 times at a film temperature of 350 between low-speed and high-speed rolls, and then supplied to a stenter and stretched 3.0 times at 400 ° C. Heat the axially stretched film at 400 ° C for 1 minute, cool to 35 ° C, apply layer A, and then apply layer B on the opposite side to obtain an aromatic polyamide film with a final thickness of 4.O ⁇ m Was. No particles were found in the resulting film as residues of the neutralizing agent.
- A, B layers Aqueous coating liquids containing the coating compositions shown in Table 7 (both are polyoxyethylene nonylphenols having an HLB value of 12.6 using an aqueous dispersion of a copolymerized polyester having the following composition as the binder resin) An enyl ether containing 5% by weight and a total solid content of 4% by weight) was applied by a kiss coat method.
- the glass transition temperature of this copolymerized polyester resin was 95 ° C.
- Table 7 shows the composition of the coating film and the properties of the film and magnetic tape.
- Example 33 lithium hydroxide previously dispersed in NMP was used as a neutralizing agent. Otherwise, the procedure was the same as in Example 33. No particles considered to be neutralizer residues were found in the obtained film. Table 7 shows the properties of the obtained film and magnetic tape.
- Example 33 was the same as Example 33 except that the composition of the coating film was as shown in Table 7. Table 7 shows the properties of the obtained film and magnetic tape.
- Example 34 LiOH was used as a neutralizing agent, and in other examples, Ca (OH) 2 was used.
- Example 33 the stretching conditions during film formation were 1.1 ⁇ 1.2 times. Otherwise, the procedure was the same as in Example 33. No particles considered to be neutralizer residues were found in the obtained film. Table 8 shows the properties of the obtained film and magnetic tape. Insufficient Young's modulus and poor electromagnetic conversion characteristics.
- Example 33 only layer A was applied, or only layer B was applied. Otherwise, the procedure was the same as in Example 33.
- Table 8 shows the properties of the obtained film and magnetic tape. If there is no surface projection on either surface, the lubricity is insufficient, and the winding property and the blocking resistance are poor.
- Example 33 the particle composition in the layer B coating film was as shown in Table 8. Otherwise, the procedure was the same as in Example 33. Table 8 shows the properties of the obtained film and magnetic tape. Poor windability and poor blocking resistance.
- Example 33 the thickness of the layer B coating film was as shown in Table 8. Otherwise, the procedure was the same as in Example 33. Table 8 shows the properties of the obtained film and magnetic tape. Poor windability and poor blocking resistance.
- Example 33 the inert fine particles Y in the layer B coating film had the particle diameters shown in Table 8. Otherwise, the procedure was the same as in Example 33.
- Table 8 shows the properties of the obtained film and magnetic tape. Dropout of particles occurs during processing, and as a result, dropouts occur frequently. Table 8
- Comparative Example 1 9 Comparative Example 2 0 Comparative Example 2 1 Comparative Example 2 2 Comparative Example 2 3 Comparative Example 24 Comparative Example 25 Coating B layer thickness (nm) 25 25 0 25 25 120 25
- Example 33 the inert fine particles Z in the layer B coating film had the particle diameters shown in Table 9. Otherwise, the procedure was the same as in Example 33.
- Table 9 shows the properties of the obtained film and magnetic tape. The winding property is poor, and the blocking resistance is also poor.
- Example 33 was carried out in the same manner as in Example 33 except that the inert fine particles X in the coating film of the layer A were changed to those having the particle diameters shown in Table 9.
- Table 9 shows the properties of the obtained film and magnetic tape. Poor electromagnetic conversion characteristics.
- Example 33 after the completion of the neutralization reaction in the polymerization step, silica having an average particle diameter of 400 nm previously dispersed in NMP was added to the polymerization system to form a stock solution, and the coating layer was coated.
- An aromatic polyamide film was obtained in the same manner as in Example 33 except that both sides were not worked.
- Table 9 shows the properties of the obtained film and magnetic tape. Electromagnetic conversion characteristics are insufficient.
- the stock solution (film C 1 layer side) used in Example 33 and the film forming stock solution (film C 2 layer side) used in Comparative Example 28 had a viscosity of 100 and a viscosity of 100 Adjust so that it is a void, and in the base, laminate two layers so that the C1 layer is 3.0 m and the ⁇ 2 layer is 1.0 m in the final film, and the C2 layer side is the metal belt side Then, an aromatic polyamide film was obtained in the same manner as in Example 33, except that the coating layer was not applied to both sides. Table 9 shows the properties of the obtained film and magnetic tape.
- the base contains silica particles of a diameter of 43 nm.
- acryl-modified polyester resin manufactured by Takamatsu Yushi & Co., IN-170-6
- polyoxyethylene nonyl phenyl ether having an HLB value of 12.6 is 1 weight per solid content of the coating.
- the content of the inert fine particles X was as shown in Table 10 except that the content of the inert fine particles X was 26% by weight in the solid content of the coating film.
- an aromatic polyamide film was obtained.
- Table 10 shows the properties of the obtained film and magnetic tape.
- the films of Examples 40 to 46 have excellent running durability and exhibit excellent properties as a metal thin film magnetic tape.
- Example 40 Example 41 * Example 42 Example 43 Example 44 Example 45 Example 46 Stretch ratio 2.5X3.0 2.5X3.0 2.5X3.0 2.5X3.0 2.5X3.0 2.5X3.0 2.5X3 .0 Young's modulus (longitudinal + ® co) 2500 kg / negation 2 2500 kg / thigh 2 2500 kg / Yuzuru 2 2500 kg / ⁇ 2 2500 kg / negation 2 2500 kg / Yuzuru 2 2500 kg / mm 2 inert particulate X material acrylic acrylic silica silicone-acrylic crosslinked ho ° Polystyrene silicone inert particles X
- Example 41 LiOH was used as a neutralizing agent, and in other examples, Ca (OH) 2 was used.
- the aromatic polyamide film for magnetic recording media which has a flat surface and excellent transportability, has good force winding property and electromagnetic conversion characteristics, and is easy to transport. Can be provided.
- a coating liquid having the same composition as described in (29) (a) was applied as a backcoat layer to a thickness of 0.8 m on the film surface (coating (layer A) surface) on the opposite side of the magnetic recording layer. Then, it was dried and cut to obtain a magnetic tape.
- NMP N-methylpyrrolidone
- calcium hydroxide made by Inoue Lime
- the mixture was filtered through a filter (HDC II, manufactured by Nippon Pall; opening: 50 m) to prepare an NMP slurry of calcium hydroxide having an average particle diameter of 1,500 nm.
- This slurry was added to the above polymer so that 50% by mole of terephthalic acid dichloride and 50.3% by mole of calcium hydroxide were used as a stock solution for film formation.
- the pH of this stock solution was 4.7.
- the logarithmic viscosity of this polymer was 3.5.
- the obtained film-forming stock solution is heated to 100 ° C, cast on a 100 ° C metal belt from a 100 ° C die, dried at 100 ° C for 2 minutes, and then heated to 120 ° C and 150 ° C.
- the temperature was increased stepwise and dried for a total of 10 minutes to obtain an unstretched film having self-holding properties.
- the unstretched film was continuously peeled from the belt, introduced into a water tank, desolvated and desalted, and then dried at 150 for 15 minutes.
- the obtained unstretched film is rolled between low-speed and high-speed rolls at a film temperature of 350 ° C.
- the film is stretched to 2.5 times, then supplied to a stenter, stretched to 3.0 times at 400 ° C., and the obtained biaxially stretched film is heat-treated at 400 ° C. for 1 minute.
- the layer A and then the layer B on the opposite side were applied to obtain an aromatic polyamide film having a final thickness of 4.0 xm.
- the average particle size of the neutralizing agent residue in the obtained film was 300 nm.
- a and B layers Aqueous coating liquids containing the coating compositions shown in Table 11 (all of which use an aqueous dispersion of the following copolymerized polyester as the binder resin and have a polyoxy resin having an HLB value of 12.6) Ethylene nonylphenol (5% by weight, total solid content: 4% by weight) was applied by a kiss coat method.
- Table 11 shows the properties of the obtained film and magnetic tape.
- Example 47 was repeated except that the application of the layer B was omitted.
- Table 11 shows the properties of the obtained film and air tape.
- Example 47 Calcium hydroxide of the same neutralizing agent as in Example 7 was pulverized with a sand grinder so as to have an average particle size of 4,800 nm, and then an NMP slurry was prepared as it was. This slurry was added to the above polymer so that calcium hydroxide was 50.06 mol% with respect to 50 mol% of terephthalic acid dichloride, and a film forming stock solution (a) was obtained (pH was 5%). 2. The logarithmic viscosity of the polymer was 3.5).
- calcium hydroxide of the same neutralizing agent as in Example 47 was pulverized with a sand grinder to an average particle size of 2,000 nm, and then filtered using a filter (manufactured by Nippon Pall, HDC II; ) To prepare an NMP slurry of calcium hydroxide having an average particle size of 600 nm. This slurry was added to the above polymer so that calcium hydroxide was 51.5 mol% with respect to 50 mol% of terephthalic acid dichloride, to thereby prepare a stock solution (a) (pH: 4.8, The logarithmic viscosity of the polymer was 3.5).
- the particle size distribution of the neutralizing agent residue in the obtained film had a maximum at 500 nm and 180 nm.
- Table 11 shows the other physical properties and properties of the film.
- Example 47 The same neutralizing agent, calcium hydroxide as in Example 47, was pulverized with a sand grinder to an average particle size of 2,000 Onm, and then filtered through a filter (manufactured by Nippon Pall, HD CII; aperture 20 nm). Thus, an NMP slurry of calcium hydroxide having an average particle diameter of 600 nm was prepared. This slurry was added to the above-mentioned polymer so that calcium hydroxide was 50.4 mol% to 50 mol% of terephthalic acid dichloride, to obtain a stock solution (pH: 4.8, logarithmic viscosity of polymer: 3.5) except that the aromatic polyamide film was obtained in the same manner as in Example 48.
- a stock solution pH: 4.8, logarithmic viscosity of polymer: 3.5
- the average particle size of the neutralizing agent residue in the obtained film was 120 nm.
- Table 11 shows other physical properties and properties of the film.
- Example 47 was carried out in the same manner as in Example 47 except that the composition of the coating film shown in Table 11 was used. The properties of the obtained films and magnetic tapes are shown in Table 11 for Examples 51 to 53, and Table 12 for Examples 54 to 58.
- Example 47 Example 48
- Example 49 Example 50
- Example 52 Example 53 Neutralizer type Ca (OH) 2 Ca (0H) 2 Ca (0H) 2 Ca (0H) 2 Ca (0H) 2
- Example 54 Example 55 Example 56 Example 57 Example 57 Example 58
- Example 48 was repeated except that the stretching conditions during film formation were 1.1 ⁇ 1.2 times.
- Table 13 shows the properties of the obtained film and air tape. As is clear from Table 13, the Young's modulus was insufficient, the electromagnetic conversion characteristics were poor, and the running stability was insufficient.
- Example 48 The procedure was the same as in Example 48 except that the application of the ⁇ layer was omitted.
- Table 13 shows the properties of the obtained film and magnetic tape. The slipperiness and air bleeding property were not appropriate, and the winding property was poor.
- Example 48 was repeated except that the pH of the membrane-forming stock solution was adjusted to 3.8. No particles considered to be residual neutralizers were found in the obtained film. Table 13 shows the properties of the obtained film and magnetic tape. The slipperiness and air bleeding property were not appropriate, and the rollability was poor.
- Example 48 The same procedure as in Example 48 was carried out except that the pH of the film forming stock solution was adjusted to 4.7, and the calcium hydroxide was added without performing the fine fractionation.
- the average particle size of the neutralizing agent residue in the obtained film was 2,250 nm.
- Table 13 shows the characteristics of the obtained film and magnetic tape. Poor surface properties resulted in poor electromagnetic conversion characteristics, and voids caused by particles in the film resulted in insufficient abrasion resistance.
- Example 48 was repeated except that the thickness of the A layer was set to 200 nm.
- Table 13 shows the characteristics of the obtained film and magnetic tape. The winding property was poor.
- Example 48 was the same as Example 48 except that the particle composition in the layer A coating film was as shown in Table 13.
- Table 13 shows the properties of the obtained film and magnetic tape. Since the composition of the particles in the coating film was out of the range, the slipperiness and air bleeding property were not appropriate, and the winding property was poor. Table 13
- Comparative Example 3 0 Comparative Example 3 1 Comparative Example 3 2 Comparative Example 3 3 Comparative Example 3 4 Comparative Example 3 5 Comparative Example 3 6 Inactive Fine Particle Z Material----Inactive Fine Particle Z
- Example 48 The same procedures as in Example 48 were carried out except that the particle composition in the A-layer coating film was as shown in Table 14.
- Table 14 shows the properties of the obtained film and magnetic tape. Poor take-up and abrasion resistance and many dropouts.
- Example 48 The same procedures as in Example 48 were carried out except that the particle composition in the A-layer coating film was as shown in Table 14. Table 14 shows the properties of the obtained film and magnetic tape. Since the particle composition in the coating film was out of the range, the particles were liable to fall off, had poor abrasion resistance, caused many dropouts, and had insufficient electromagnetic conversion characteristics.
- Comparative Example 32 after completion of the neutralization reaction in the polymerization step, silica having an average particle diameter of 400 nm previously dispersed in NMP was added to the polymerization system to form a film-forming stock solution.
- An aromatic polyamide film was obtained in the same manner as in Comparative Example 32 except that the construction was not performed.
- Table 14 shows the properties of the obtained film and magnetic tape. Agglomeration of particles occurred and coarse particles were generated, so that appropriate surface properties were impaired and electromagnetic conversion characteristics were insufficient. The agglomerated particles caused the abrasion resistance to deteriorate due to the an, resulting in frequent dropouts.
- An aromatic polyamide film was obtained in the same manner as in Example 48 except that the film was formed by casting and the layer A was not coated. Table 14 shows the properties of the obtained film and magnetic tape.
- the film according to the present invention has low dropout when formed into a magnetic tape, exhibits excellent electromagnetic conversion characteristics, and has excellent transportability and winding property of the base film. On the other hand, those that do not satisfy the requirements of the present invention cannot satisfy these characteristics at the same time.
- a base film for a high-density magnetic recording medium which is excellent in transportability while having a flat surface, and excellent in winding properties and electromagnetic conversion characteristics
Landscapes
- Magnetic Record Carriers (AREA)
- Laminated Bodies (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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US09/445,772 US6344257B1 (en) | 1998-04-13 | 1999-04-13 | Aromatic polyamide film for high-density magnetic recording media |
EP99913647A EP1003156A1 (en) | 1998-04-13 | 1999-04-13 | Aromatic polyamide film for high-density magnetic recording medium |
Applications Claiming Priority (8)
Application Number | Priority Date | Filing Date | Title |
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JP10131698A JP2001093134A (ja) | 1998-04-13 | 1998-04-13 | 高密度磁気記録媒体用芳香族ポリアミドフィルム |
JP10/101316 | 1998-04-13 | ||
JP10/104664 | 1998-04-15 | ||
JP10466498A JP2001093135A (ja) | 1998-04-15 | 1998-04-15 | 高密度磁気記録媒体用芳香族ポリアミドフィルム |
JP12482998A JP2001088259A (ja) | 1998-05-07 | 1998-05-07 | 易搬送性芳香族ポリアミドフィルム |
JP10/124829 | 1998-05-07 | ||
JP14934398A JP2001093136A (ja) | 1998-05-29 | 1998-05-29 | 磁気記録媒体用芳香族ポリアミドフィルム |
JP10/149343 | 1998-05-29 |
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WO1999053483A1 true WO1999053483A1 (fr) | 1999-10-21 |
WO1999053483A9 WO1999053483A9 (fr) | 2000-03-02 |
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Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1999/001958 WO1999053483A1 (fr) | 1998-04-13 | 1999-04-13 | Couche de polyamide aromatique pour support d'enregistrement magnetique haute densite |
Country Status (5)
Country | Link |
---|---|
US (1) | US6344257B1 (ja) |
EP (1) | EP1003156A1 (ja) |
KR (1) | KR20010013755A (ja) |
TW (1) | TW534866B (ja) |
WO (1) | WO1999053483A1 (ja) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1232844A4 (en) * | 2000-03-13 | 2004-03-31 | Teijin Ltd | AROMATIC POLYAMIDE FILM |
US20030129367A1 (en) * | 2001-07-23 | 2003-07-10 | Fuji Photo Film Co., Ltd. | Magnetic recording medium |
JP4795614B2 (ja) * | 2002-10-23 | 2011-10-19 | Hoya株式会社 | 情報記録媒体用ガラス基板及びその製造方法 |
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JPH07230618A (ja) * | 1994-02-16 | 1995-08-29 | Toray Ind Inc | 磁気記録媒体用積層ポリエステルフィルム |
JPH09141798A (ja) * | 1995-11-20 | 1997-06-03 | Teijin Ltd | 積層フイルム |
WO1997039876A1 (fr) * | 1996-04-19 | 1997-10-30 | Toray Industries, Inc. | Couche mince en polyamide aromatique, son procede de fabrication et support d'enregistrement magnetique l'utilisant |
JPH09314760A (ja) * | 1996-05-24 | 1997-12-09 | Teijin Ltd | 積層フィルム |
JPH09323386A (ja) * | 1996-06-06 | 1997-12-16 | Teijin Ltd | 積層フイルム |
JPH106449A (ja) * | 1996-06-25 | 1998-01-13 | Teijin Ltd | 積層フイルム |
JPH1049852A (ja) * | 1996-07-30 | 1998-02-20 | Sony Corp | 磁気記録媒体 |
JPH1095074A (ja) * | 1996-07-31 | 1998-04-14 | Teijin Ltd | 積層フィルム |
JPH10151706A (ja) * | 1996-11-25 | 1998-06-09 | Teijin Ltd | 積層フイルム |
JPH10157024A (ja) * | 1996-11-29 | 1998-06-16 | Teijin Ltd | 積層フイルム |
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EP0787579B1 (en) | 1996-02-05 | 2002-10-09 | Teijin Limited | Biaxially oriented laminate films and magnetic recording media |
EP0811478B1 (en) | 1996-06-06 | 2002-04-24 | Teijin Limited | Laminate film and magnetic recording medium using the same |
US5935674A (en) * | 1996-07-01 | 1999-08-10 | Fuji Photo Film Co., Ltd. | Disc type magnetic recording medium |
EP0822220B1 (en) | 1996-07-31 | 2003-12-17 | Teijin Limited | Laminate film |
-
1999
- 1999-04-13 EP EP99913647A patent/EP1003156A1/en not_active Withdrawn
- 1999-04-13 US US09/445,772 patent/US6344257B1/en not_active Expired - Fee Related
- 1999-04-13 KR KR1019997011770A patent/KR20010013755A/ko active IP Right Grant
- 1999-04-13 WO PCT/JP1999/001958 patent/WO1999053483A1/ja not_active Application Discontinuation
- 1999-04-13 TW TW088105876A patent/TW534866B/zh not_active IP Right Cessation
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JPH07230618A (ja) * | 1994-02-16 | 1995-08-29 | Toray Ind Inc | 磁気記録媒体用積層ポリエステルフィルム |
JPH09141798A (ja) * | 1995-11-20 | 1997-06-03 | Teijin Ltd | 積層フイルム |
WO1997039876A1 (fr) * | 1996-04-19 | 1997-10-30 | Toray Industries, Inc. | Couche mince en polyamide aromatique, son procede de fabrication et support d'enregistrement magnetique l'utilisant |
JPH09314760A (ja) * | 1996-05-24 | 1997-12-09 | Teijin Ltd | 積層フィルム |
JPH09323386A (ja) * | 1996-06-06 | 1997-12-16 | Teijin Ltd | 積層フイルム |
JPH106449A (ja) * | 1996-06-25 | 1998-01-13 | Teijin Ltd | 積層フイルム |
JPH1049852A (ja) * | 1996-07-30 | 1998-02-20 | Sony Corp | 磁気記録媒体 |
JPH1095074A (ja) * | 1996-07-31 | 1998-04-14 | Teijin Ltd | 積層フィルム |
JPH10151706A (ja) * | 1996-11-25 | 1998-06-09 | Teijin Ltd | 積層フイルム |
JPH10157024A (ja) * | 1996-11-29 | 1998-06-16 | Teijin Ltd | 積層フイルム |
Non-Patent Citations (1)
Title |
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See also references of EP1003156A4 * |
Also Published As
Publication number | Publication date |
---|---|
WO1999053483A9 (fr) | 2000-03-02 |
EP1003156A4 (en) | 2000-05-24 |
TW534866B (en) | 2003-06-01 |
KR20010013755A (ko) | 2001-02-26 |
US6344257B1 (en) | 2002-02-05 |
EP1003156A1 (en) | 2000-05-24 |
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