JP2003281706A - Cleaning tape - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cleaning tape to be a cleaning medium for a magnetic recorder which can be used suitably for cleaning to a magnetic head of a high density magnetic recording and reproducing device and the like and comes in slide contact with the head along the shape of the head with less head wear to perform satisfactory cleaning. <P>SOLUTION: The cleaning tape having a lower coating layer containing principally non-magnetic inorganic powder and a binder and a cleaning layer containing at least ferromagnetic inorganic powder and a binder in this order on a substrate made of an aromatic polyamide is characterized in that the surface of the cleaning layer has 3 to 6 nm surface roughness Ra and 0.4 to 2.0 mm projecting curl at room temperature. <P>COPYRIGHT: (C)2004,JPO

Description

DETAILED DESCRIPTION OF THE INVENTION [0001] BACKGROUND OF THE INVENTION 1. Field of the Invention
About For more details, for video and computer
Magnetic head used in magnetic recording / reproducing apparatus or
Magnets such as cleaning tapes used for cleaning running systems
The present invention relates to a cleaning medium for a recording apparatus. [0002] 2. Description of the Related Art Generally, magnets for video and computers
Recording / reproducing of magnetic recording devices, such as magnetic heads and magnetic tapes
Is performed by sliding the magnetic media in contact with each other
The At this time, the magnetic tape shavings powder on the surface of the magnetic head
If dust around the device adheres, the playback output will be low,
They won't get any output at all. Declined like this
To recover the playback output, adhere to the surface of the magnetic head.
To clean the dirt and restore the playback output
A cleaning medium such as an adhesive tape is used. On the other hand, the density of magnetic recording has been increasing year by year.
Good contact between the magnetic head tip and magnetic tape
If you don't do this, you may not be able to
It has increased. Here, the so-called "per head"
To keep it good, the cleaning tape
Remove dirt and adjust the shape of the head to some extent.
Both are becoming necessary. Especially in recent years, the shortest recording wavelength
Magnetic recording that performs high-density recording such that is less than 0.5 μm
The magnetic head of the recording / playback device is also used.
The gap length is 0.3 μm or less, and a slight head
Also, the dirt on the disc will hinder the recording / reproducing performance. Ma
In recent years, tapes have been developed to support higher capacities and higher transfer rates.
Is thinner, lowering the tension of the VTR traveling system and cylinder
Speeding up and securing the area around the head of the tape
It has become difficult. So, hit the tape head
It is necessary to increase the rigidity in order to improve the
Aramid, which is a support, is increasingly used
It was. Accordingly, the cleaning tape support is also
It is necessary to secure the same head contact as tape
is there. On the other hand, the material of the magnetic head is conventionally also surface hardness.
High ferrites were the mainstream, but higher density was promoted
In recent years, metal heads such as Sendust have been used.
I'm coming. Here, the metal head is a ferrite head.
Since the head is softer than the head, the head tends to wear more
There is. Therefore, the head by the cleaning tape
It is important that the amount of wear is small. Especially the recent high record density
In the degree system, the head wear becomes more severe. By the way, a polishing machine used for polishing a magnetic head is used.
As a prior art of polishing tape, for example, JP-A-62-92
No. 205 includes a nonmagnetic powder on a nonmagnetic support.
Intermediate layer and polishing layer containing non-magnetic abrasive
An abrasive tape is disclosed. This polishing tape has two layers
Adopting the structure to roughen the surface properties of the intermediate layer,
By reducing the abrasive particle size of the polishing layer, the polishing power is reduced.
While maintaining it, it prevents the head from scratching.
This type of polishing tape is used for finish polishing of magnetic heads.
Since the surface roughness is 0.03 to 0.3 μm,
Doing proper polishing for cleaning
And is not suitable for use as a cleaning tape.
It is right. A magnetic tape polishing tape similar to the above is provided.
JP-A-62-94270, JP-A-62-9220
No. 5 is also disclosed. These are also two-layer polishing
The magnetic head is scratched by moderate polishing.
It is difficult to perform good cleaning without removing
None of these are suitable as cleaning media
is there. In addition, Japanese Patent Laid-Open No. 2000-57541
Is 4 to 7 μm thick using an aromatic polyamide support
A cleaning tape with a thin layer and a surface roughness of 6 to 12 nm.
Are disclosed. However, recent helical heights
The recording density system makes head wear more severe.
Therefore, it becomes necessary to make the surface even smoother.
It was. However, with a surface roughness of less than 6 nm,
It was difficult to optimize the strength. [0008] Accordingly, it is an object of the present invention.
Is used for magnetic heads such as high-density magnetic recording / reproducing devices.
It can be used suitably for leaning, along its shape
Good cleaning with less head wear due to sliding contact
A cleaning medium for magnetic recording devices
Is to provide a ninging tape. [0009] The present inventor has achieved the above object.
As a result of intensive studies to achieve this, the following configuration is adopted.
By overcoming the drawbacks of the prior art,
It is possible to achieve both head wear and cleanability.
And found. That is, the present invention provides an aromatic polyamide support.
Contains mainly non-magnetic inorganic powder and binder on the carrier
A lower coating layer and at least an inorganic powder of ferromagnetic powder
And a cleaning layer containing a binder in this order.
In the cleaning tape comprising
The surface roughness Ra of the layer surface is 3 to 6 nm,
0.4 to 2.0 mm convex in the convex direction at room temperature
Cleaner characterized by having a curl in the range
Tape. The cleaning tape of the present invention has the above structure.
Since the surface properties are smooth,
Wear can be reduced and scratches can be reduced.
The Furthermore, it has curls (also called cupping) in a convex direction.
So that the cleaning medium is strongly applied to the magnetic head.
Cleaning power can be increased. In particular, curl
The cleaning layer surface is 0.4 to 2.0 mm in the convex direction
The head touch is good and the cleaning property is good.
The Therefore, the cleaning tape of the present invention has a head
Minimizes wear while maintaining cleaning power
It becomes possible. [0011] BEST MODE FOR CARRYING OUT THE INVENTION The cleaning tape of the present invention will be described below.
The details will be described. Cleaning medium of the present invention
The basic structure is non-magnetic and flexible aromatic aramid support
Lower layer mainly composed of non-magnetic inorganic powder and binder on the body
Coating layer and inorganic powder made of at least ferromagnetic powder on it
A cleaning layer containing a powder and a binder is provided. The cleaning layer has a thickness of 0.
The thickness of the lower coating layer is preferably from 0.3 to 1.0 μm.
2-2.0 micrometers is preferable. Also, as the thickness of the support
Is preferably 2.0 to 5.0 μm, and the cleaning medium
(Cleaning tape) The total thickness is 4.0-
9.0 μm is preferred. If it is less than 4.0 μm, the head hits
Insufficient cleaning power is insufficient, and 9.0
Thickness exceeding μm is preferable because head wear increases.
It ’s not good. Centerline average surface roughness of the cleaning layer
Ra is 3 to 6 nm. Cleaning below 3nm
When the force decreases and becomes rougher than 6nm,
It is unsuitable due to increased wear. Cleaning medium of the present invention
The cleaning layer surface has a convex curl, 0.4
-2.0 mm is preferable. Less than 0.4mm
Even if the wrapping force decreases and becomes too strong exceeding 2.0 mm
The cleaning power is reduced. In addition, the magnetic characteristics of the cleaning layer
The coercive force Hc is 40 to 239 KA / m, the external magnetic field 7
Squareness ratio (residual) in magnetization curve measured at 96 KA / m
Magnetic flux density Br / maximum magnetic flux density Bm) is 0.6 to 0.98
Is preferred. The cleaning layer is formed by applying a lower coating layer.
After the coating is formed on the support, this lower coating layer is still wet.
Apply a cleaning layer on top of it while it is wet
So-called wet-on-wet coating method (simultaneous or sequential)
Wet coating method). Next, the detailed contents of the lower coating layer will be described.
To do. First, inorganic powder used for the lower coating layer of the present invention
Is non-magnetic powder, metal oxide, metal carbonate, metal
Inorganic such as sulfate, metal nitride, metal carbide, metal sulfide
It can be selected from quality compounds. As the inorganic compound, for example, an alpha conversion rate of 90
% Α-alumina, β-alumina, γ-alumina,
θ-alumina, silicon carbide, chromium oxide, cerium oxide
, Α-iron oxide, goethite, corundum, silicon nitride,
Titanium carbide, titanium oxide, silicon dioxide, oxide oxide
, Magnesium oxide, tungsten oxide, zirconium oxide
Ni, boron nitride, zinc oxide, calcium carbonate, sulfuric acid
Calcium, barium sulfate, molybdenum disulfide, etc.
Used alone or in combination. Particularly preferred is the ease of availability and cost.
, Small particle size distribution, and many functions
, Titanium dioxide, zinc oxide, iron oxide, barium sulfate
More preferred are titanium dioxide and alpha iron oxide.
The The particle size of these non-magnetic powders is 0.00
5 to 2 μm is preferable, but if necessary, the particle size varies.
Combining non-magnetic powders or using a single non-magnetic powder
Can also have the same effect by widening the particle size distribution.
The Particularly preferred non-magnetic powder particle size is 0.
01-0.2 μm. Tap density is 0.05-2g
/ Ml, preferably 0.2 to 1.5 g / ml. Non
The water content of the magnetic powder is 0.1 to 5% by mass, preferably 0.
2-3 mass%, more preferably 0.3-1.5 mass%
is there. The nonmagnetic powder has a pH of 2 to 11, but the pH is 5
Is particularly preferred. Nonmagnetic powder has a specific surface area of 1
~ 100m²/ G, preferably 5 to 70 m²/ G, even better
Preferably 10 ~ 65m²/ G. Non-magnetic powder crystals
The child size is preferably 0.004 to 1 μm, 0.04 to
0.1 μm is more preferable. Oil absorption using DBP is 5
-100 ml / 100 g, preferably 10-80 ml /
100g, more preferably 20-60ml / 100g
is there. The specific gravity is 1 to 12, preferably 3 to 6. shape
Can be acicular, spherical, polyhedral, or plate-like,
In the case of a nonmagnetic inorganic powder, the average particle size is 0.08 μm or more
Contains 50% by weight or more of the following with respect to the entire inorganic powder
In the case of acicular nonmagnetic inorganic powder,
The major axis length is 0.05 to 0.3 μm and the needle ratio is 3 to 20.
Is preferably contained in an amount of 50% by mass or more based on the whole inorganic powder.
It is. The ignition loss is preferably 20% by mass or less.
Preferably, it is considered most preferable that it does not exist. Book
The Mohs hardness of the inorganic powder used in the invention is 4 or more,
10 or less are preferable. Roughness of these powder surfaces
The sfactor is preferably 0.8 to 1.5, more preferably
The roughness factor is 0.9 to 1.2. Inorganic powder
The amount of SA (stearic acid) adsorbed in the powder is 1-20 μmol / m
²More preferably 2 to 15 μmol / m²It is. Undercoat
The heat of wetting of the non-magnetic powder of the cloth layer in water at 25 ° C. is 200-6.
00 erg / cm²It is preferable that it exists in the range. Ma
Solvents in this wet heat range can be used.
The The amount of water molecules on the surface at 100 to 400 ° C. is 1 to 10
Pieces / 100A are appropriate. The pH of the isoelectric point in water is 3
It is preferably between ˜6. On the surface of these nonmagnetic powders, Al
₂O_Three, SiO₂TiO₂, ZrO₂, SnO₂, Sb
₂O_Three, ZnO, Y₂O_ThreeIt is preferable to surface-treat with.
Particularly preferred for dispersibility is Al.₂O_Three, SiO₂, Ti
O₂, ZrO₂More preferred is Al₂O_Three, S
iO₂, ZrO₂It is. Use these in combination
It can also be used alone. Depending on the purpose,
The surface treatment layer co-precipitated may be used.
A method of treating the surface layer with silica after treating with Mina,
Or the reverse method can also be taken. In addition, surface treatment
The physical layer may be a porous layer depending on the purpose, but it is homogeneous.
And dense are generally preferred. Nonmagnetic powder used in the lower coating layer of the present invention
Specific examples at the end include NanoTite manufactured by Showa Denko KK,
HIT-100, ZA-G1, manufactured by Tomo Chemical Co., Ltd., manufactured by Toda Kogyo Co., Ltd.
α-hematite, DPN-250, DPN-250BX,
DPN-245, DPN-270BX, DPN-550
BX, Ishihara Sangyo Titanium oxide TTO-51B, TTO
-55A, TTO-55B, TTO-55C, TTO-
55S, TTO-55D, SN-100, α-hematite
E270, E271, E300, STT made by Titanium Industry
-4D, STT-30D, STT-30, STT-65
C, Teica MT-100S, MT-100T, MT-
150W, MT-500B, MT-600B, MT-1
00F, MT-500HD, Sakai Chemical's FINEX-2
5, BF-1, BF-10, BF-20, ST-M, the same
DEFIC-Y, DEFIC-R, Nippon Ae
Rosil AS2BM, TiO2P25, Ube Industries
100A, 500A, Y-LOP made by Titanium Industry and it
Can be mentioned. Among the above, particularly preferred non-magnetic powders are α
-Iron oxide and titanium dioxide. α-iron oxide (hematai
G) used under the following conditions
it can. First, α-Fe₂O_ThreeParticle powder is obtained by the following method.
Acicular goethite particles as the precursor particles are obtained. First
As a method, an equivalent amount or more of an alkali hydroxide is added to a ferrous aqueous solution.
Contains ferrous hydroxide colloid obtained by adding aqueous solution
The suspension is oxygenated at a temperature above pH 11 and below 80 ° C.
An acicular gator by ventilating gas and performing an oxidation reaction
This is a method for generating the yttrium particles. The second method includes ferrous salt aqueous solution and charcoal.
FeCO obtained by reacting with acid-alkali aqueous solution_ThreeThe
Oxidation reaction is performed by bubbling oxygen-containing gas through the suspension
To produce goethite particles with spindle shape
Is the method. As a third method, the ferrous salt aqueous solution is used.
Less than the amount of aqueous alkali hydroxide or aqueous carbonate
First containing ferrous hydroxide colloid obtained by adding liquid
Oxygen-containing gas is passed through the iron salt aqueous solution to perform the oxidation reaction.
To produce acicular goethite core particles,
To the ferrous salt aqueous solution containing acicular goethite core particles, the first
Fe in aqueous iron salt solution²⁺Equal to or greater than alkali hydroxide
After adding the aqueous solution, the needle-like
This is a method for growing goethite core particles. The fourth method is equivalent to ferrous aqueous solution.
Add less than alkali hydroxide or alkali carbonate aqueous solution
Ferrous salt aqueous solution containing ferrous hydroxide colloid
By conducting an oxidation reaction by passing an oxygen-containing gas through the liquid
Generating needle-like goethite core particles,
Method for growing said acicular goethite core particles in neutral region
Etc. It should be noted that the particle powder during the goethite particle formation reaction
Ni, Z usually added to improve the properties of the powder
Even if different elements such as n, P, and Si are added, there is no problem.
Yes. The acicular gater as the precursor particle
Ide particles are dehydrated in the temperature range of 200-500 ° C,
If necessary, further heating in the temperature range of 350-800 ° C
Annealed by treatment, acicular α-Fe₂O_ThreeGet particles
The In addition, acicular goethite grains to be dehydrated or annealed
The child has a sintering inhibitor such as P, Si, B, Zr, Sb on the surface.
There is no problem even if it adheres. Moreover, 350-800 degreeC
Annealing by heat treatment in the temperature range is dehydration.
Acicular α-Fe obtained₂O_ThreeOccurring on the particle surface
The pores of the particles are melted by annealing
It is preferable to block the pores to form a smooth surface.
Because. Α-Fe used in the present invention₂O_Threegrain
The child powder is acicular obtained by dehydration or annealing.
α-Fe₂O_ThreeDisperse the particles in an aqueous solution to form a suspension.
l compound is added to adjust the pH and the α-Fe₂O_Threeparticle
After coating the surface of the particles with the additive compound, filtration, water
Washing, drying, crushing, if necessary, further deaeration and consolidation
Can be obtained. The Al compound used is acetic acid
Luminium, aluminum sulfate, aluminum chloride, glass
Aluminum salts such as aluminum oxide and sodium aluminate
Alkali aluminates such as can be used. This
In this case, the amount of Al compound added is α-Fe₂O_ThreeAgainst particle powder
And it is 0.01-50 mass% in conversion of Al. 0.01
When the content is less than% by mass, the dispersion in the binder resin
Is insufficient and the particle surface exceeds 50 mass%.
Preferred because Al compounds floating on the surface interact with each other
It ’s not. Nonmagnetic inorganic powder of the lower coating layer in the present invention
At the end, we started with Si compounds as well as Al compounds.
P, Ti, Mn, Ni, Zn, Zr, Sn, Sb
Coating with one or more compounds selected from
You can also. These compounds for use with Al compounds
The added amount of the product is α-Fe₂O_ThreeAgainst particle powder
It is the range of 0.01-50 mass%. 0.01% by mass
If full, the effect of improving dispersibility by adding
If it exceeds 50% by mass, it floats outside the particle surface.
Preferred for interaction between interacting compounds
Yes. In addition, titanium dioxide used for the lower coating layer
The manufacturing method is as follows. These oxidized chi
There are mainly sulfuric acid method and chlorine method for producing tan. Sulfuric acid method is il
Minite source ore is digested with sulfuric acid and Ti, Fe, etc.
Extract as the acid salt. Iron sulfate is crystallized and removed, and the rest
After filtration and purification of titanyl sulfate solution, thermal hydrolysis was performed.
Then, hydrous titanium oxide is precipitated. After filtering and washing this,
Contaminating impurities were removed by washing, and particle size modifiers were added.
After that, if it is fired at 80 to 1,000 ° C., it becomes crude titanium oxide.
The Rutile and anatase types are added during hydrolysis.
Depending on the type of nucleating agent. This crude titanium oxide powder
It is made by crushing, sizing, surface treatment, etc. Chlorine method is the original
Natural or synthetic rutile is used as the ore. Ore is high
Chlorinated in the hot reduction state, Ti is TiCl_FourAnd Fe is
FeCl₂The iron oxide that became solid by cooling becomes liquid.
Body TiCl_FourSeparated. Crude TiCl obtained_FourIs fine
After purification by distillation, add a nucleating agent,
Instantly react with oxygen at the above temperature to obtain crude titanium oxide
The The crude titanium oxide produced in this oxidative decomposition process is pigmented.
The finishing method for imparting properties is the same as the sulfuric acid method. In the surface treatment, the above titanium oxide material is dried powder.
After crushing, add water and dispersant, and roughen by wet crushing and centrifugation
Grain classification is performed. Then, the fine slurry is a surface treatment tank
Here, the surface coating of the metal hydroxide is performed.
First, a predetermined amount of Al, Si, Ti, Zr, Sb, Sn,
Add an aqueous salt solution such as Zn to neutralize the acid, or
Is a hydrous oxide produced by adding alkali and titanium oxide
The particle surface is coated. By-product water-soluble salts are decanted
Removal by filtration, filtration and washing, and finally slurry p
Adjust H, filter and wash with pure water. Washed ke
Use a spray dryer or a band dryer to dry the cake.
It is dried. Finally, the dried product is crushed with a jet mill.
And become a product. In addition to aqueous systems, titanium oxide powder
AlCl at the end_Three, SiCl_FourThen steam through the steam
It is also possible to apply Al and Si surface treatment by flowing in.
For other pigment manufacturing methods, see G.D.Parfitt and K.
S.W.Sing ”Characterization of Powder Surfaces” Aca
You can refer to demic Press, 1976. The non-magnetic inorganic powder as described above includes carbon.
Black may also be included, and these inorganic powders
The binder to be scattered will be described later. Carbon black is mixed with the lower coating layer.
By reducing the surface electrical resistance Rs, which is a known effect,
Obtaining an antistatic effect and reducing light transmittance
Can achieve the desired micro Vickers hardness.
You can. The micro Vickers hardness of the lower coating layer is
Usually 25-60kg / mm², Preferably per head
30-50kg / mm to adjust²And N
Edge angle 80 using EC thin film hardness tester HMA-400
Pressing a diamond triangular pyramid needle with a tip radius of 0.1 μm
Measure using the tip of the child. As carbon black that can be used,
Furnace for rubber, thermal for rubber, black for color,
Examples include acetylene black. These carbon
The specific surface area of black is 100-500m²/ G, preferred
150-400m²/ G, DBP oil absorption is 20-4
00ml / 100gg, preferably 30-200ml /
100 g. The primary particle size of carbon black is 10
-80 nm, preferably 10-50 nm, more preferably
Is 10 to 40 nm. The pH of carbon black is 2
-10, moisture content 0.1-10%, tap density 0.1
˜1 g / ml is preferred. Carbon black tool used in the present invention
As a physical example, BLACKPEA manufactured by Cabot Corporation
RLS2000, 1300, 1000, 900, 80
0, 880, 700, VULCAN XC-72, Mitsubishi
# 3050B, 3150B, 3250 manufactured by Kasei Kogyo Co., Ltd.
B, # 3750B, # 3950B, # 950, # 650
B, # 970B, # 850B, MA-600, MA-2
30, # 4000, # 4010, Conron Beer Carbon
CONDUCTEX SC, RAVEN880 manufactured by the company
0, 8000, 7000, 5750, 5250, 350
0, 2100, 2000, 1800, 1500, 125
5, 1250, Ketjen Black EC made by Akzo
Etc. Display carbon black as a dispersant.
Even if the surface treatment or grafting with resin is used, the surface
It is acceptable to use a graphitized part of
Yes. Also, before adding carbon black to the paint,
It may be dispersed with a caulking binder. These carbon blacks are the above inorganic powders.
The range of 5 to 49% by mass with respect to the end, 4 of the total mass of the nonmagnetic layer
It can be used within a range not exceeding 0%. These carbon tubes
The racks can be used alone or in combination.
Carbon black that can be used in the present invention is, for example, “Carbo”.
Refer to the Carbon Black Handbook ”
be able to. In the present invention, the lower coating layer has an organic substance.
Powder may be added depending on the purpose. For example,
Kurylstyrene resin powder, benzoguanamine resin powder
Powder, melamine resin powder, phthalocyanine pigment
Polyolefin resin powder, polyester
Resin powder, polyamide resin powder, polyimide resin powder
A polyfluorinated ethylene resin can also be used.
The manufacturing method thereof is disclosed in JP-A-62-18564 and JP-A-60.
Used as described in Japanese Patent No. 255827
it can. Other binders, lubricants, and components for the lower coating layer
Powders, additives, solvents, dispersion methods, etc.
Applicable. In particular, the amount of binder, type, additives, dispersants
For added amounts and types, known technologies related to magnetic layers are applied.
it can. Next, a detailed description of the upper cleaning layer will be given.
Explain. First, inorganic powder to be mixed in the cleaning layer
Includes a ferromagnetic powder. This ferromagnetic powder
As γ-FeOx (x = 1.33 to 1.5), C
o Modified γ-FeOx (x = 1.33 to 1.5), α-F
e or Ni or Co as the main component (75% or more)
Ferromagnetic alloy powder, barium ferrite, strontium
Known ferromagnetic powders such as ferrite can be used.
A ferromagnetic alloy powder containing Fe as a main component is preferable. these
In addition to the predetermined atoms, the ferromagnetic powder of Al, Si, S,
Sc, Ca, Ti, V, Cr, Cu, Y, Mo, Rh,
Pd, Ag, Sn, Sb, Te, Ba, Ta, W, R
e, Au, Hg, Pb, Bi, La, Ce, Pr, N
d, P, Co, Mn, Zn, Ni, Sr, B, Mg, etc.
May be included. Especially in the field of metal magnetic material
Al, Si, Ca, Y, Ba, La, Nd, Co,
Ni and B are important as elements contained in addition to α-Fe
The In particular, Si, Al, and Y are surface treatments and sintering inhibitors.
As important. Co contains 2 to 40% by mass with respect to Fe.
What it has is preferable. Si, Al, Y is 0-10 mass
Included between%. These ferromagnetic powders will be discussed later
Before dispersion with dispersant, lubricant, surfactant, antistatic agent, etc.
You may perform the process in advance. In particular,
Japanese Examined Patent Publication No. 44-14090, Japanese Examined Publication No. 45-1837
No. 2, Japanese Patent Publication No. 47-22062, Japanese Patent Publication No. 47
-22513, JP-B-46-28466,
Japanese Patent Publication No. 46-38755, Japanese Patent Publication No. 47-4286
No. 47, Japanese Patent Publication No. 47-12422, Japanese Patent Publication No. 47-
No. 17284, JP-B 47-18509, JP
Japanese Patent Publication No. 47-18573, Japanese Patent Publication No. 39-10307
No. 48, Japanese Patent Publication No. 48-39639, US Patent 30
No. 26215, No. 3031341, No. 3100194
No., No. 3420005, No. 3338914, etc.
It is listed. Among the above-mentioned ferromagnetic powders, ferromagnetic alloy fine powders
May contain small amounts of hydroxides or oxides
Yes. Obtained by a known manufacturing method of ferromagnetic alloy fine powder
Can be used, for example
You can. Complex organic acid salt (mainly oxalate) and water
Reducing with a reducing gas such as elemental, iron oxide with hydrogen, etc.
Fe or Fe-Co particles by reducing with a reducing gas of
How to thermally decompose metal carbonyl compounds
Method, Sodium borohydride in aqueous solution of ferromagnetic metal, then
Add a reducing agent such as phosphite or hydrazine
Reduction method, evaporating metal in a low-pressure inert gas
For example, a method for obtaining a fine powder. Obtained in this way
The ferromagnetic alloy powder is a known slow oxidation treatment, that is, an organic solvent.
Soaked in an organic solvent
In other words, an oxygen-containing gas was sent to form an oxide film on the surface.
Method of drying, oxygen gas and inert without using organic solvent
The method of forming an oxide film on the surface by adjusting the partial pressure of gas
Any of these can be used. The ferromagnetic powder of the cleaning layer of the present invention is changed to B.
40-80m in terms of specific surface area by ET method²/ G
Preferably 50 to 70 m²/ G. 40m²/ G
If it is less than 80m, noise will increase,²When exceeding / g, table
It is difficult to obtain surface properties, which is not preferable. Cleaning layer of the present invention
The crystallite size of the ferromagnetic powder is 300-100Å
Preferably 250 to 100 mm, more preferably 20
0-140cm. The saturation magnetization σs of the ferromagnetic powder is 100-18.
0A ・ m²/ Kg is preferred, more preferably 110
~ 170A ・ m²/ Kg, more preferably 125-16
0A ・ m²/ Kg. The coercive force Hc of the ferromagnetic powder is 4
0 to 239 KA / m is preferable. The squareness ratio is 0.6-0.
98 is preferable, and the amount of magnetization of the cleaning layer is 0.03 to 0.03.
0.3 Gauss · cm is preferred. Meanwhile, ferromagnetic powder needle
The shape ratio is preferably 4-18, more preferably 5-12.
is there. The moisture content of the ferromagnetic powder should be 0.01-2%
preferable. Depending on the type of binder, the moisture content of the ferromagnetic powder is
It is preferable to optimize. The pH of the ferromagnetic powder is a combination with the binder used.
It is preferable to optimize it. The range is 4-1
2, but preferably 6-10. Ferromagnetic powder
Al, Si, P or their oxides as required
The surface treatment may be applied. The amount is ferromagnetic powder
0.1 to 10% with respect to the fatty acid when subjected to surface treatment
Adsorption of lubricant such as 100mg / m² Less preferred
That's right. Ferromagnetic powder has soluble Na, Ca, Fe, N
It may contain inorganic ions such as i and Sr. these
Is preferably essentially absent, but at 200 ppm or less
If present, there is little effect on the characteristics. Also strong
The magnetic powder should have fewer vacancies and its value is 20 volumes
The amount is not more than%, more preferably not more than 5% by volume. The cleaning layer of the present invention and the lower layer coating
As a binder used for the fabric layer, a conventionally known thermoplastic system
Resins, thermosetting resins, reactive resins and mixtures of these
Used. As a thermoplastic resin, the glass transition temperature is-
100-150 ° C., number average molecular weight 1,000-20
10,000, preferably 10,000 to 100,000
0, the degree of polymerization is about 50 to 1,000. Examples of such are vinyl chloride, acetic acid.
Vinyl, vinyl alcohol, maleic acid, acrylic acid,
Acrylic acid ester, vinylidene chloride, acrylonitrile
Methacrylic acid, methacrylic acid ester, styrene,
Butadiene, ethylene, vinyl butyral, vinyl acetate
Polymers containing tar, vinyl ether, etc. as constituent units
Or copolymer, polyurethane resin, various rubber resins
is there. In addition, as thermosetting resin or reactive resin,
Enol resin, epoxy resin, polyurethane cured tree
Fat, urea resin, melamine resin, alkyd resin, acrylic
System reaction resin, formaldehyde resin, silicone resin,
Epoxy-polyamide resin, polyester resin and isocyanate
Anate prepolymer mixture, polyester polyol
Mixture of polyurethane and polyisocyanate, polyurethane and polyisocyanate
And a mixture of isocyanates. These resins
About “Plastic Handbook” published by Asakura Shoten
Is described in detail. Also known electron beam curing
Mold resin is used for lower coating layer or upper cleaning layer
It is also possible to do. Regarding these examples and the manufacturing method thereof, see
This is described in detail in JP-A-62-256219.
The above resins can be used alone or in combination, but are preferred.
Vinyl chloride resin, vinyl chloride vinyl acetate tree
Fat, vinyl chloride vinyl acetate vinyl alcohol resin, chloride
Choose from vinyl acetate vinyl maleic anhydride copolymer
A combination of at least one selected from a polyurethane resin, and
Is a combination of these with a polyisocyanate.
I can get lost. The structure of polyurethane resin is polyester poly
Urethane, polyether polyurethane, polyether
Reester polyurethane, polycarbonate polyurethane
Polyester, Polycarbonate, Polyurethane, Poly
Caprolactone polyurethane, polyolefin polyurethane
Known materials such as tan can be used. All shown here
For better dispersibility and durability
-COOM, -SO as needed_ThreeM, -OSO_Three
M, -P = O (OM)₂, -OP = O (OM)₂(here
M is a hydrogen atom or an alkali metal base), -OH,
-NR₂, -N⁺R_Three(Where R is a hydrocarbon group), epo
Xi group, -SH, -CN, sulfobetaine, phosphobeta
At least selected from in, carboxybetaine, etc.
Also, one polar group introduced by copolymerization or addition reaction
Is preferably used. The amount of such polar groups is 10
^-1-10^-8Mol / g, preferably 10^-2-10^-6
Mol / g. Specific examples of these binders used in the present invention
A typical example is VAGH, V manufactured by Union Carbide.
YHH, VMCH, VAGF, VAGD, VROH, V
YES, VYNC, VMCC, XYHL, XYSG, P
KHH, PKHJ, PKHC, PKFE, Nissin Chemical Industry
MPR-TA, MPR-TA5, MPR-TA made by the company
L, MPR-TSN, MPR-TMF, MPR-TS,
MPR-TM, MPR-TAO, 100 manufactured by Denki Kagaku
0W, DX80, DX81, DX82, DX83, 10
0FD, ZEON Corporation MR-104, MR-10
5, MR110, MR100, 400X-110A, Japan
Nippon run N2301, N230 made by this polyurethane company
2, N2304, Pandex T-manufactured by Dainippon Ink
5105, T-R3080, T-5201, Burnock
D-400, D-210-80, Crisbon 6109,
7209, Byron UR8200, UR8 manufactured by Toyobo Co., Ltd.
300, UR8600, Daifera Seika's Daiferamin
4020, 5020, 5100, 5300, 9020,
9022, 7020, MX5004 manufactured by Mitsubishi Chemical Corporation, three
Samprene SP-150 and TIM-300 manufactured by Yosei Kasei Co., Ltd.
3, TIM-3005, Saran F310 manufactured by Asahi Kasei Corporation,
F210 etc. are mention | raise | lifted. Among them, MR-104, M
R110, MPR-TAO, MPR-TA, UR-82
00, UR8300, and TIM-3005 are preferred. Bonds used in the cleaning layer of the present invention
The agent is 5 to 24 mass% with respect to the inorganic powder including the ferromagnetic powder.
Is used, preferably in the range of 8 to 22% by mass.
The 5-30% by mass when using vinyl chloride resin
2-20% by mass when using polyurethane resin, poly
Isocyanates are combined in the range of 2 to 20% by mass.
It is preferable to use them together. Especially in the cleaning layer
It contains no polyisocyanate and has a polyisocyanate in the lower coating layer.
A configuration including an anate is desirable. In the present invention, when polyurethane is used
The glass transition temperature is −50 to 100 ° C. and the elongation at break is 1
00 to 2000%, breaking stress is 0.05 to 10 kg / c
m²The yield point is 0.05 to 10 kg / cm.²Is preferred. The cleaning medium of the present invention has two or more layers.
Become. Therefore, the amount of binder, vinyl chloride occupying in the binder
Resin, polyurethane resin, polyisocyanate
Or the amount of resin other than that, each forming the cleaning layer
Resin molecular weight, polar group weight, or the aforementioned resin
If necessary, the lower layer coating layer and cleaning layer
Of course, it is possible to change the
Yes. As the polyisocyanate used in the present invention,
Is tolylene diisocyanate, 4-4'-diphenyl
Methane diisocyanate, hexamethylene diisocyanate
, Xylylene diisocyanate, naphthylene-1,
5-diisocyanate, o-toluidine diisocyanate
, Isophorone diisocyanate, triphenylmethane
Isocyanates such as triisocyanate and the like
Products of these isocyanates and polyalcohols
Polyisocyanate formed by condensation of isocyanates
Cyanate and the like can be used. These isoshi
Commercially available product names of anates include Nippon Poly
Coronate L, Coronate HL, Corone made by Urethane
2030, Coronate 2031, Millionate M
R, Millionate MTL, Takenate D manufactured by Takeda
-102, Takenate D-110N, Takenate D-2
00, Takenate D-202, Death made by Sumitomo Bayer
Module L, Death Module IL, Death Module
N, Death Module HL, Dainippon Ink
Such as D502 etc.
Apply two or more layers under coating
Both the layer and the upper cleaning layer can be used. The cleaning layer of the present invention also has a lower coating layer.
Similarly, carbon black may be mixed as an inorganic powder.
This carbon black is a furnace for rubber and rubber.
Thermal, black for color, acetylene black, etc.
Can be used. Specific surface area is 5-500m²/ G,
DBP oil absorption is 10-400ml / 100g, particle size is
5m to 300m, pH is 2 to 10, water content is 0.1
-10% and the tap density is preferably 0.1-1 g / cc.
As a specific example of carbon black used in the present invention,
Is manufactured by Cabot Corporation, BLACKPEARLS 200
0, 1300, 1000, 900, 800, 700, V
ULCAN XC-72, Asahi Carbon Co., # 80, #
60, # 55, # 50, # 35, made by Mitsubishi Chemical Industries, #
2400B, # 2300, # 5, # 900, # 950,
# 970, # 1000, # 30, # 40, # 10B,
NONVIA CARBON, CONDUCTEX SC,
RAVEN 150, 50, 40, 15 etc.
The Carbon black is surface treated with a dispersant,
Even if it is grafted with a resin, a part of the surface is graphed.
You may use the one that has been converted to a lite. Also car
Before adding Bon Black to the cleaning layer paint
It may be dispersed with a binder in advance. These cars
Bon black can be used alone or in combination.
Yes. When carbon black is used,
It is preferable to use it at 5% by mass or less of the amount with respect to the conductive powder.
Yes. Carbon black is an antistatic and abrasive material for the cleaning layer.
Functions such as reducing the friction coefficient, imparting light-shielding properties, and improving film strength
These differ depending on the carbon black used. Obedience
These carbon blacks used in the present invention are
Change the type, amount, and combination of the leaning layer and lower coating layer.
Particle size, oil absorption, conductivity, pH, etc.
Of course, it can be used according to the purpose based on the various characteristics.
It is possible. The cleaning layer includes an inorganic powder.
And may contain an abrasive.
Α-alumina, β-alumina, silicon carbide with a rate of 90% or more
Element, chromium oxide, cerium oxide, α-iron oxide, colanda
, Artificial diamond, silicon nitride, silicon carbide titanium car
Bite, titanium oxide, silicon dioxide, boron nitride, etc.
Known materials with a hardness of 6 or more are used alone or in combination
Is done. Also, a composite of these abrasives (abrasives
May be used which have been surface treated with other abrasives).
These abrasives contain compounds or elements other than the main component.
If the main component is 90% or more
There is no change. Specific examples of abrasives include Sumitomo Chemical Co., Ltd.
AKP-20, AKP-30, AKP-50, HIT
-50, HIT-60, HiT-60A, HIT-70
A, HIT-80, HIT-80G, HIT-100,
G5, G7, S-1, made by Nippon Chemical Industry Co., Ltd.
TF-100, TF-140 and the like. The particle size of these abrasives is 0.01-2.
μm is preferable, but if necessary, the particle size is different.
Wide range of particle size distribution by combining abrasives or single abrasive
In this way, the same effect can be achieved. Tap density
Is 0.3-2g / cc, moisture content is 0.1-5%, PH is
2-11, specific surface area is 1-30m²/ G is preferred.
The shape of the abrasive used in the present invention is acicular, spherical, or psycho
Any of B-shaped, but having a corner in a part of the shape
Is preferable because of its high cleaning property. No cleaning layer
The amount of the abrasive as the machine powder is 10% of the ferromagnetic powder 10
It is 1-45 mass% with respect to 0 mass%. Used in the present invention
The above-mentioned abrasive is the above-mentioned lower layer coating layer, upper layer cleaning layer
Change the type, amount, and combination in accordance with the purpose.
Of course it is possible. These abrasives are clear
Even if it is added to the magnetic paint after being dispersed with the first binder
It doesn't matter. Cleaning the cleaning medium of the present invention
The abrasive present on the surface of the layer and the end face of the cleaning layer is 5
Piece / 100μm²The above is preferable. The lower coating layer or cleaning layer of the present invention
Additives used in coatings are lubricating and antistatic
As a result, those having a dispersing effect, a plasticizing effect, etc. are used.
Molybdenum disulfide, tungsten disulfide graphite,
Boron nitride, graphite fluoride, silicone oil, polar group
Silicone, fatty acid-modified silicone, fluorine-containing silicone
Ricorn, fluorine-containing alcohol, fluorine-containing beauty treatment salon
, Polyolefin, polyglycol, alkyl phosphate
Steal and its alkali metal salts, alkyl sulfate ester
And alkali metal salts thereof, polyphenyl ether,
Fluorine-containing alkyl sulfate and its alkali gold
Genus salt, monobasic fatty acid having 10 to 24 carbon atoms (unsaturated bond)
Can be included or branched)
And these metal salts (Li, Na, K, Cu, etc.)
Is a monovalent, divalent, trivalent, tetravalent, five-carbon
Valent, hexahydric alcohols (including unsaturated bonds, also branched
Alcoki having 12 to 22 carbon atoms may be used)
Sialcohol, monobasic fatty acid having 10 to 24 carbon atoms
It may contain saturated bonds or be branched)
And monovalent, bivalent, trivalent, tetravalent, pentavalent, and six carbon atoms
Any one of the monohydric alcohols (including unsaturated bonds,
It may also be branched)
Ester or difatty acid ester or trifatty acid ester
Monoalkyl ethers of tellurium and alkylene oxide polymers
Fatty acid esters, fatty acid amides having 8 to 22 carbon atoms,
An aliphatic amine having 8 to 22 carbon atoms can be used. Specific examples of these include lauric acid, my
Listic acid, palmitic acid, stearic acid, behenic acid,
Butyl stearate, oleic acid, linoleic acid, linole
Acid, elaidic acid, octyl stearate, steari
Amyl acid, Isooctyl stearate, Myristic acid
Octyl, butoxyethyl stearate, anhydroso
Rubitan monostearate, anhydrosorbitans
Tearate, anhydrosorbitan tristearate,
Oleyl alcohol, lauryl alcohol
The In addition, alkylene oxide, glycerin,
Ricidol-based, alkylphenol ethylene oxide
Nonionic surfactants such as adducts, cyclic amines, esters
Amides, quaternary ammonium salts, hydantoin derivatives
Body, heterocycles, phosphonium or sulfonium, etc.
Cationic surfactant, carboxylic acid, sulfonic acid, phosphorus
Contains acidic groups such as acids, sulfate groups, and phosphate groups
Anionic surfactant, amino acids, aminosulfonic acid
Amino acid sulfuric acid or phosphate esters,
An amphoteric surfactant such as a ruquilvedine type can also be used.
For these surfactants, see “Surfactant Handbook”.
It is described in detail in (issued by Sangyo Tosho Co., Ltd.). This
These lubricants, antistatic agents, etc. are not necessarily 100% pure.
In addition to the main components, isomers, unreacted substances, side reactions,
Impurities such as demolition materials and oxides may be included. this
The content of these impurities is preferably 30% or less, more preferably
It is 10% or less. These lubricants and interfaces used in the present invention
The type and amount of the activator is determined by the lower coating layer and cleaning layer.
It can be used as needed. For example, lower layer coating
To the surface using fatty acids with different melting points in the cleaning and cleaning layers
Control bleed-out or have different boiling point and polarity
Control surface bleeding or surface activity
Adjust the dosage to improve application stability or
Lubricating effect is improved by increasing the amount of lubricant added in the lower coating layer
Of course, only the examples shown here are possible.
It is not something that can be done. Also, all of the additives used in the present invention.
Or part of it can be added at any stage of paint production.
I don't know. For example, when mixing with inorganic powder before the kneading process
In the kneading process with inorganic powder, binder and solvent
If it is added in the dispersion step,
In some cases, it is added just before coating. Also on purpose
Depending on the application of the cleaning layer, apply simultaneously or sequentially.
Apply some or all of the additive with a cloth to
May be achieved. Depending on the purpose,
After cleaning or after slitting, cleanin
A lubricant can also be applied to the surface of the adhesive layer. Product examples of these lubricants used in the present invention
As NAA-102 and NAA-4 manufactured by NOF Corporation
15, NAA-312, NAA-160, NAA-18
0, NAA-174, NAA-175, NAA-22
2, NAA-34, NAA-35, NAA-171, N
AA-122, NAA-142, NAA-160, NA
A-173K, castor hardened fatty acid, NAA-42, NA
A-44, Cation SA, Cation MA, Cation A
B, cation BB, Naimine L-201, Naimine
L-202, Naimine S-202, Nonion E-20
8, Nonion P-208, Nonion S-207, Nonio
K-204, Nonion NS-202, Nonion NS-
210, Nonion HS-206, Nonion L-2, Noni
ON S-2, Nonion S-4, Nonion O-2, Nonio
LP-20R, Nonion PP-40R, Nonion SP
-60R, Nonion OP-80R, Nonion OP-85
R, Nonion LT-221, Nonion ST-221,
Nonion OT-221, Monoguri MB, Nonion DS-6
0, Anon BF, Anone LG, Butyl stearate, B
Cyl laurate, erucic acid, olein made by Kanto Chemical
Acid, FAL-205, FAL-123 manufactured by Takemoto Yushi Co., Ltd.
NJELB LO, NJOLB IP made by Shin Nippon Rika Co., Ltd.
M, Sunsocizer E4030, TA made by Shin-Etsu Chemical
3, KF-96, KF-96L, KF96H, KF41
0, KF420, KF965, KF54, KF50, K
F56, KF907, KF851, X-22-819,
X-22-822, KF905, KF700, KF39
3, KF-857, KF-860, KF-865, X-
22-980, KF-101, KF-102, KF-1
03, X-22-3710, X-22-3715, KF
-910, KF-3935, Lion Armor
-Mide P, Armide C, Armoslip CP, Rai
Duomin TDO manufactured by On Oil & Fats, BA manufactured by Nisshin Oil Co., Ltd.
-41G, Sanyo Chemical Co., Ltd. Profan 2012E,
-Pole PE61, Ionette MS-400, Ionette
MO-200, Ionette DL-200, Ionette
DS-300, Ionette DS-1000, Ionette
DO-200 etc. are mentioned. Lower coating layer and cleaning layer of the present invention
The organic solvent used in acetone is acetone, methyl in any ratio
Ethyl ketone, methyl isobutyl ketone, diisobutyl
Ketone, cyclohexanone, isophorone, tetrahydro
Ketones such as furan, methanol, ethanol, propa
Nord, Butanol, Isobutyl alcohol, Isopro
Alcohols such as pill alcohol and methylcyclohexanol
, Methyl acetate, butyl acetate, isobutyl acetate, vinegar
S, such as isopropyl acid, ethyl lactate, glycol acetate
Tellurium, glycol dimethyl ether, glycol mono
Glycol ethers such as ethyl ether and dioxane
System, benzene, toluene, xylene, cresol, black
Aromatic hydrocarbons such as rubenzene, methylene chloride
, Ethylene chloride, carbon tetrachloride, chloroform,
Chlorination of ethylene chlorohydrin, dichlorobenzene, etc.
Hydrocarbons, N, N-dimethylformamide, hexane
Etc. can be used. These organic solvents are not necessarily 10
Not 0% pure, other than the main components, isomers, unreacted substances, by-products
Even if impurities such as reactants, decomposition products, oxides, moisture, etc. are included
It doesn't matter. The content of these impurities is preferably 30% or less.
More preferably, it is 10% or less. The organic solvent used in the present invention is a cleaning layer.
It is preferable that the kind is the same in the lower coating layer
However, the amount added may be changed. Table on the lower coating layer
High surface tension solvent (cyclohexanone, dioxane
It is preferable to improve the stability of coating using
Therefore, the arithmetic average value of the solvent composition of the cleaning layer is
It is important that the solvent composition of the fabric layer does not fall below the arithmetic average value.
is there. Strong polarity to improve dispersibility
It is preferable, and the solvent composition has a dielectric constant of 15-20.
It is preferable that 50 mass% or more of an agent is contained. Also melt
The solution parameter is preferably 8-11. Thickness structure of the cleaning tape of the present invention
Has a non-magnetic support as thin as 2.0 to 5.0 μm.
It is effective. Total thickness of cleaning layer and lower coating layer
Is used in the range of 1/100 to 2 times the thickness of the non-magnetic support
It is done. Adhesion between nonmagnetic support and lower coating layer
An adhesive layer for improvement may be provided. The thickness of this adhesive layer
Is preferably 0.01-2 μm, more preferably 0.0
2 to 0.5 μm. Also, the non-magnetic support cleaner
A backcoat layer may be provided on the side opposite to the coating layer side.
Yes. The thickness is preferably 0.1 to 2 μm, more preferably
Or 0.3 to 1.0 μm. These adhesive layers,
A well-known thing can be used for a quacoat layer. Used for the cleaning tape of the present invention.
The nonmagnetic support is an aromatic polyamide support. Good
Regarding aromatic polyamide, JP-A-2000-57541
It is described in the gazette. In the present invention, MD and TD
Aromatic poly having a bending rate of 9,800-14,700 MPa
Amides are preferred. This non-magnetic support is pre-coated.
Rona discharge treatment, plasma treatment, easy adhesion treatment, heat treatment, removal
You may perform dust processing. To achieve the object of the present invention, a non-magnetic support is used.
Centerline average surface roughness of the surface on which the body cleaning layer is applied
It is necessary to use a Ra of 3 to 6 nm. Also,
These non-magnetic supports simply have a low centerline average surface roughness.
It is preferable that there are no coarse protrusions of 1 μm or more.
Good. The surface roughness shape is non-magnetic support if necessary.
Depending on the size and amount of filler added to the body
Is to be trawled. As these fillers
Is bonded with oxides or carbonates of Al, Ca, Si, Ti, etc.
Crystalline or amorphous, acrylic or melamine
Which organic fine powder is mentioned. Also, both driving durability and
In order to stand, the roughness of the surface on which the backcoat layer is applied
Is preferably rougher than the surface to which the cleaning layer is applied.
Good. The centerline surface roughness of the backcoat layer application surface is preferred
It is 1 nm or more, more preferably 4 nm or more.
Roughness between the coated surface of the cleaning layer and the coated surface of the backcoat layer
When changing the
However, it can be changed by providing a coating layer.
I don't know. Nonmagnetic support tape used in the present invention
The F-5 value in the running direction (HD direction) is preferably 98-4
90MPa, F-5 value in tape width direction (TD direction) is good
It is preferably 98 to 294 MPa, and the longitudinal direction of the tape
The F-5 value is generally higher than the F-5 value in the tape width direction.
Although it is necessary to increase the strength in the width direction,
This is not the case. Also, non-magnetic support tape running
The heat shrinkage rate at 100 ° C for 30 minutes in the direction and width direction is favorable.
Preferably 3% or less, more preferably 1.5% or less, 8
The heat shrinkage rate at 0 ° C. × 30 minutes is preferably 1% or less.
Preferably, it is 0.5% or less. The breaking strength is
49-980 MPa, Young's modulus is 6860-1960
0 MPa is preferred. The light transmittance at 900 nm is 3
It is preferably 0% or less, more preferably 3% or less. The lower coating layer of the cleaning medium of the present invention
And at least the process of producing the cleaning layer paint
Also necessary before and after the kneading process, dispersion process and these processes
It consists of the mixing process provided according to. Each process is
It may be divided into two or more stages. Used in the present invention
Ferromagnetic powder, binder, carbon black, polishing
All raw materials such as chemicals, antistatic agents, lubricants and solvents
It may be added at the beginning or in the middle of the process. Also,
Individual ingredients may be added in two or more steps.
I don't know. For example, a polyurethane kneading step, a dispersing step,
Split in the mixing process for viscosity adjustment after dispersion.
Also good. In order to achieve the object of the present invention,
Known manufacturing techniques can be used as part of the process
Of course, in the kneading process, continuous kneader and processing
It is preferable to use a material with a strong kneading force such as a pressure kneader.
Good. Strong when using continuous or pressure kneaders
All or part of magnetic powder and binder (but all
30% or more of the mixture is preferable) and ferromagnetic powder 100
The kneading treatment is performed in the range of 15 to 500 parts per part. this
For details of the kneading process, see JP-A-1-166338.
And Japanese Patent Application Laid-Open No. 64-79274.
The Also, when adjusting the non-magnetic layer solution of the lower coating layer
It is desirable to use a dispersion medium with high specific gravity.
Near beads are preferred. A cleaning medium having a multilayer structure as in the present invention.
As an example of an apparatus and method for applying the body, the following configuration is used.
Can make a suggestion. 1. Commonly used in the application of magnetic paint
Gravure coating, roll coating, blade coating, extrusion
First, apply the lower coating layer using a version coating device, etc.
While the lower coating layer is still wet,
No. 186, JP-A-60-238179, JP-A-60-238179
Support pressurization disclosed in Japanese Patent Laid-Open No. 2-265672
Upper layer cleaning with a mold extrusion coating device
Apply the layer. 2. JP 63-88080, JP
Japanese Laid-Open Patent Publication No. 2-17971, Japanese Laid-Open Patent Publication No. 2-265672
In the two coating liquid passage slits as disclosed in
One coating head for storing and cleaning the lower coating layer
The coating layer is applied almost simultaneously. 3. Disclosure in JP-A-2-174965
Extrusion with backup roll
Almost simultaneous application of the lower coating layer and the cleaning layer by the coating device
Apply to. In order to prevent agglomeration of magnetic particles, a special
Japanese Laid-Open Patent Publication No. 62-95174 and Japanese Unexamined Patent Publication No. 1-2236968
In the coating head by a method as disclosed in Japanese Patent Publication No.
It is desirable to apply a shearing force to the coating liquid of the part. More
In addition, regarding the viscosity of the coating liquid, JP-A-3-8471
It is necessary to satisfy the numerical range disclosed in the report. The cleaning tape of the present invention (cleanin
Cleaning layer to obtain ferromagnetism)
You may perform the orientation process of a powder. This orientation is 0.1T
The solenoid with the above magnetic force and the magnetic force of 0.2T or more
It is preferable to use a cobalt magnet with the same polarity facing each other.
Furthermore, it is arranged so that the orientation after drying is the highest.
It is preferable to provide an appropriate drying step in advance. Also, non-magnetic lower coating layer and cleaning
Before applying the layers simultaneously, the polymer is the main component
Adhesion layer, corona discharge, UV irradiation, EB illumination
Combines known techniques to improve adhesion by shooting
Preferably. Furthermore, the surface roughness is adjusted as necessary.
Calendar processing can be performed for this purpose. calendar
-Epoxy, polyimide, polyamid as treatment roll
Heat resistant plastic rods such as
Can be used. Also, with metal rolls
It can also be processed. The treatment temperature is preferably 15-5
0 ° C, linear pressure is preferably 5-100 kg / m, speed is
50-400 m / min. Cleaning of the cleaning medium of the present invention
Friction coefficient for SUS420J on the layer surface and the opposite surface
The number is preferably 0.1 to 0.5, more preferably
0.2-0.3. The surface resistivity is preferably 10
^Four-10¹²Ohm / sq, 0.5% elongation of cleaning layer
The elastic modulus of the belt is preferably 980 in both the running direction and the width direction.
~ 19600 MPa, breaking strength is preferably 98000
~ 2940000 Pa. The cleaning medium as a whole is
As mentioned above, the Young's modulus in the longitudinal (MD) direction is 9800-
14700 MPa, Young's modulus in the width (TD) direction is 980
0 to 14700 MPa and longitudinal Young's modulus / width direction
Young's modulus is 1 / 2-2 / 1. Furthermore, the residual elongation of the cleaning medium is favorable.
Preferably at any temperature below 0.5% and below 100 ° C
Preferably has a heat shrinkage of 1% or less, more preferably
0.5% or less, most preferably 0.1% or less, 0
% Is ideal. Glass transition temperature of cleaning layer (1
Maximum loss modulus of dynamic viscoelasticity measured at 10Hz
The point) is preferably 50 ° C. or higher and 120 ° C. or lower.
It is preferably 0 ° C to 100 ° C. Loss modulus is 1 ×
10⁷~ 8x10⁸N / m²Preferably in the range of
The loss tangent is preferably 0.2 or less. loss
If the tangent is too large, adhesion failure is likely to occur. cleaning
The residual solvent contained in the layer is preferably 100 mg / m²
Or less, more preferably 10 mg / m²Below and above
Residual solvent contained in the layer cleaning layer is contained in the lower coating layer.
It is preferable that the amount is less than the residual solvent. Porosity is below
Preferably both the coating layer and the cleaning layer are 50% by volume or less.
Lower, more preferably 40% by volume or less. Cleaning of the cleaning medium of the present invention
As described above, the magnetic properties of the layer are V at a magnetic field of 796 KA / m.
When measured by SM, the coercive force Hc in the tape running direction is 4
0-239 KA / m. Squareness ratio is 0.6 ~ 0.98
It is preferably 0.80 or more, more preferably
Or 0.85 or more. Two perpendicular to the tape running direction
The squareness ratio in the direction is 80% or less of the squareness ratio in the traveling direction.
It is preferable. SFD of cleaning layer is 0.6 or less
Preferably 0.5 or less, more preferably
Ideally 0. Remanens coercive force Hr in the longitudinal direction
143 to 239 KA / m is preferable. Vertical Hc and
And Hr is preferably 80 to 398 KA / m.
Further, the center line surface roughness Ra of the cleaning layer is 3.0.
˜6.0 nm is preferred. R obtained by evaluation by AFM
MS surface roughness RRMS should be in the range of 2-15 nm
preferable. The cleaning medium of the present invention comprises a lower coating layer and
Although it has a cleaning layer, depending on the purpose,
These physical properties can be changed in the leaning layer
It is easy to estimate. For example, Cleanin
At the same time as increasing the elastic modulus of the grip layer and improving running durability
Make the lower coating layer elastic modulus lower than that of the cleaning layer
For example, the hitting of the media to the head is improved.
Also, change the tensing method of the support so that the head
It is also effective in the present invention to improve the
Tensioned in a direction perpendicular to the longitudinal direction of the loop
In many cases, the holder has better head contact. Main departure
The tape width of the bright cleaning medium is not particularly limited
However, a width of 6.35 mm (1/4 inch) is particularly preferred. [0080] The present invention will be described more specifically with reference to the following examples.
Of course, the scope of the present invention is of course limited by these.
Is not to be done. In addition, the display of the following "part" is
“Mass” is expressed. <Example 1> Coating liquid for cleaning layer having the following composition
For each of the coating solution for the lower coating layer,
After kneading with an open kneader, use a sand mill to separate
Scattered. [0081] [Coating liquid composition for cleaning layer]   Ferromagnetic metal fine powder (Fe / Co = 70/30) 100 parts           Hc 175KA / m           Specific surface area by BET method 46m²/ G           Crystallite size 160Å           Surface treatment agent Al₂O_Three, SiO₂, Y₂O_Three           Particle size (major axis diameter) 0.09μm           Needle ratio 8           σs 153A ・ m²/ Kg   Polyester polyurethane resin 12 parts           Neopentyl glycol / Caprolactone polyol / MDI           = 0.9 / 2.6 / 1           -SO_ThreeNa group 1 × 10^-FourContains eq / g   α-Al₂O_Three(Average particle size 0.15 μm) 5 parts   Carbon black (average particle size 0.08μm) 0.5 part   Butyl stearate 1 part   Stearic acid 5 parts   90 parts of methyl ethyl ketone   30 parts of cyclohexanone   60 parts of toluene [0082] [Coating solution composition for lower layer coating layer]   Nonmagnetic powder αFe₂O_Three(Hematite) 80 parts           Long axis length 0.15μm           Specific surface area by BET method 52m²/ G           pH 8           Tap density 0.8           DBP oil absorption 27-38g / 100g           Surface treatment agent Al₂O_Three, SiO₂   20 parts of carbon black           Average primary particle size 16mμ           DBP oil absorption 80ml / 100g           pH 8.0           Specific surface area by BET method 250m²/ G           Volatiles 1.5%   12 parts of vinyl chloride copolymer           ZEON MR-110   Polyester polyurethane resin 5 parts           Neopentyl glycol / Caprolactone polyol / MDI           = 0.9 / 2.6 / 1           -SO_ThreeNa group 1 × 10^-FourContains eq / g   α-Al₂O_Three(Average particle size 0.2 μm) 1 part   Butyl stearate 1 part   1 part of stearic acid   100 parts of methyl ethyl ketone   50 parts of cyclohexanone   50 parts of toluene The resulting dispersion was mixed with polyisocyanate (day
Coronate L) manufactured by Polyurethane Co., Ltd.
Add 5 parts to the cloth liquid and add methyl ethyl keto to each.
40 parts of a mixed solvent of cyclohexanone and 1 μm
Filter using a filter with an average pore size and apply underlayer
Adjust the coating solution for forming the layer and cleaning layer.
It was. The obtained coating solution for the lower coating layer was dried
Immediately after that, the thickness is 1.4 μm.
The thickness after drying the coating liquid for the cleaning layer is
Cleaner with a thickness of 3.6μm to be 0.15μm
Aromatic pores with a centerline surface roughness of 1.5 nm
Apply simultaneous multi-layer coating on lyamide support, both layers still wet
Cobalt magnet with a magnetic force of 0.3T while in the wet state
And dried by a solenoid with a magnetic force of 0.15T
After drying, it is composed of metal roll and epoxy resin roll
200 m / min per minute at a temperature of 40 ° C with a 7-stage calendar
And then backcoat with a thickness of 0.5μm
The layer was applied. Slit this to a width of 6.35mm,
A cleaning tape for 6.35 mm was prepared. <Example 2> In Example 1, lower layer coating
In the same way, except that the thickness of the layer was increased to 1.8 μm.
A polishing tape was prepared. <Example 3> In Example 1, lower layer coating
The thickness of the layer is reduced to 1.0 μm, and the back coat layer
In the same way, except that the thickness of the
A ning tape was prepared. <Comparative Example 1> In Example 1, lower layer coating
The thickness of the layer is increased to 1.8 μm, and the back coat layer
The thickness was reduced to 0.1μm and the curl was further reduced.
A cleaning tape was prepared in the same manner except for the above. <Comparative Example 2> In Example 1, the thickness of the lower layer
The thickness of the back coat layer is reduced to 0.7 μm.
Other than making it 1.2mm thick and further curling larger
A cleaning tape was produced in the same manner. <Comparative Example 3> In Example 1, the thickness of the lower layer
The thickness of the back coat layer is reduced to 1.0 μm.
The thickness is reduced to 2 μm and the base thickness is increased to 4.4 μm.
In the same way, except that the curl is further reduced.
A ning tape was prepared. <Comparative Example 4> In Example 1, the back cover
The thickness of the gate layer is increased to 1.2 μm and the base thickness is
Other than thinning to 3.0μm and further curling
A cleaning tape was produced in the same manner. <Embodiment 4> In Embodiment 1, the calendar
Except for raising the temperature to 70 ° C and smoothing the surface properties
A cleaning tape was produced in the same manner. <Example 5> In Example 1, the calendar
Except for the extremely long time to-and the rough surface
A cleaning tape was produced in the same manner. Comparative Example 5 In Example 1, the calendar
-Temperature increased to 80 ° C and calendar speed increased to 10
It is the same except that the surface properties are smoothed down to 0 m / min.
In this way, a cleaning tape was produced. Comparative Example 6 In Example 1, the calendar
In the same way, except that the surface properties were roughened.
A ning tape was prepared. <Example 6> In Example 1, lower layer coating
The nonmagnetic inorganic powder of the layer is changed from α-hematite to the following ferromagnetic
Remove the cleaning tape in the same way except changing to powder.
Produced. [0096]   100 parts of ferromagnetic powder (Co-modified gamma iron oxide)           Hc 750 Oe           Specific surface area by BET method 42m²/ G           Crystallite size 220mm           Surface treatment agent Al₂O_Three, SiO_Three           Particle size (major axis diameter) 0.26μm           Needle ratio 10           σs 72A ・ m²/ Kg <Example 7> In Example 1, lower layer coating
The nonmagnetic inorganic powder in the layer is changed from α-hematite to
Rutile TiO₂In the same way except changing to
A tape was prepared. [0098]   Nonmagnetic inorganic powder (TiO₂Crystalline rutile)           Average primary particle size 0.035μm           Specific surface area by BET method 40m²/ G           DBP oil absorption 27-38ml / 100g           pH 7.5           TiO₂Content 90% or more Cleaning of the above examples and comparative examples
Cleaning layer for each sample of tape media, below
Thickness of layer coating layer, type of lower layer inorganic powder, type of support and
Tables 1 to 3 below show the thickness and the total thickness of the medium. Each trial
A cleaning test was conducted on the charge. Below the evaluation results
Shown in Tables 1 to 3. <Evaluation method> The measurement method of each measured value is described below.
Show. (Measurement method for thickness of cleaning layer and lower coating layer)
With a diamond cutter across the length of the media
Cut out to a thickness of about 0.1 μm and doubled with a transmission electron microscope
We observed it at a rate of 30,000 times and took a picture of it. Photo pre
The current size is A4 version. Then the cleaning layer,
Pay attention to the shape difference between the ferromagnetic powder and non-magnetic powder in the lower coating layer.
The interface is visually judged and blackened, and the cleaning layer
The surface was also black. Later, Zeiss drawing
Measure the distance between the bordered lines with the image processor IBAS2.
It was. The length of the sample photograph extends over a range of 21 cm, and the measurement points are
It was measured by spotting. The simple average of the measured values at that time
It was set as the thickness of the cleaning layer and the lower layer coating layer. (Center line average surface roughness) TO made by WYKO
About 250 μm × 25 by optical interferometry using PO3D
Ra of the surface of the medium having an area of 0 μm was measured. Measurement wavelength is
Spherical correction and cylindrical correction are added at about 650 nm. (Head wear) DVCPRO deck D95
0 for 10 minutes at 23 ° C x 70% RH.
Running 5 winding tapes, the head height before and after
Measure the head wear per minute of one roll
It was. ○ is less than 0.03μm, x is 0.03μm or more
It was. (Head cleaning power) Fuji photo in advance
Using 180 minute tape of DVCPRO-25 made by Film
And measure the output. Then clogging
A standard tape produced for the purpose of running on that VTR
And observe the head condition with a strobe to make the head dirty.
Stop driving when there is a lot of power and there is no output
Confirm. After that, remove each cleaning tape of the sample 1
Fuji Photo Film recorded in advance after running for a minute
Measure the 180 minute output of the company DVCPRO-25,
The difference dB between the first measured output and the last measured output is
It was set as the evaluation of the head cleaning power. ○ less than 1.0dB,
1.0 dB or more was set as x. (Curl) 6.35mm wide slit
Cut out 10 cm of the tape and make it free on a flat board
Tape from the surface when the magnetic layer is placed facing upward
The distance (mm) to the upper end was defined as d. Measured at room temperature. [0105] [Table 1] [0106] [Table 2] [0107] [Table 3] As described above, the lower layer thickness, the back layer thickness,
When the curl is changed by changing the support thickness
The ning force was compared. From the results in the table above, the same head wear
Even if the amount of wear is curl is less than 0.4mm and flat
The cleaning power has decreased. (Comparative Example 1 and Comparative Example
3) If the curl is too strong beyond 2mm,
The leaning power has decreased. (Comparative Example 2 and Comparative Example 4)
If the curl is too small or too large, the tape
If the cleaning performance decreases
Estimated. When the surface property was changed under the calendar conditions
Table 2 shows the relationship between the head wear and the cleaning power.
When the surface roughness is smoother than 3nm, the cleaning power is improved.
(Comparative Example 5), and if it is too coarse at 7 nm, the head wear
Wear increased (Comparative Example 6).
It was unsuitable as a group. From the results shown in Table 3, the type of the lower coating layer powder was determined.
Even if the cleaning tape was prepared by changing the method (Example 6
And Example 7), the same performance was obtained with no difference from Example 1.
It was. [0111] As described above, according to the present invention,
With the above configuration, the head cleaning power
It is possible to minimize wear while maintaining
To achieve both low head wear and cleanability
The cleaning tape which can be provided can be provided.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor             2-1-12 Ogimachi, Odawara-shi, Kanagawa Prefecture             Shishi Photo Film Co., Ltd.

Claims (1)

What is claimed is: 1. A lower coating layer mainly containing a nonmagnetic inorganic powder and a binder on an aromatic polyamide support;
In the cleaning tape having at least an inorganic powder of ferromagnetic powder and a cleaning layer containing a binder in this order, the surface roughness Ra of the surface of the cleaning layer is 3 to 6 nm, and the surface of the cleaning layer is convex at room temperature. A cleaning tape having a curl in a range of 0.4 to 2.0 mm in a direction.