JPH09223305A - Cleaning tape - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a cleaning tape which prevents brown stain and head clog of a magnetic head, prevents the degradation in characteristics, such as increase of an error rate, and assures the product life of the magnetic head. SOLUTION: A magnetic layer 2 and a pigment layer 3 contg. at least a binder, inorg. pigment and lubricant are adjacently formed on the main surface 1a side of a nonmagnetic base 1 which is a base film consisting of polyethylene terephthalate, etc. The cleaning tape formed in such a manner is disposed at the junction between the leader tape of the magnetic tape and the magnetic tape. Besides the, magnetic tape and the cleaning tape are not necessary to be separately produced and connected, and the magnetic layer 2 may be formed on the nonmagnetic tape 1 and the pigment layer 3 may be formed thereon in succession thereto. When such cleaning tape is made to travel on the surface of the magnetic head, the deposits formed by adhesion of the inorg. particles in the pigment layer 3 onto the magnetic head surface are removed by polishing. Amine salt in the pigment layer 3 wipes away the magnetic head surface to remove the deposits.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cleaning tape used for cleaning a magnetic head. Specifically, by specifying the type of lubricant contained in the pigment layer formed on the support, it is possible to prevent deterioration of characteristics such as an increase in the error rate of the magnetic head, and also ensure the durability of the head. The present invention relates to a cleaning tape that can be used.

[0002]

2. Description of the Related Art In order to meet the recent demand for higher recording density, a magnetic coating material containing very fine magnetic particles and a resin binder is coated on a non-magnetic support, which is used as a magnetic layer. Type magnetic recording media and thin-film magnetic recording media in which a magnetic layer is formed on a non-magnetic support made of polyethylene terephthalate (PET) or the like as a substrate by a method such as vacuum deposition, plating or sputtering Has been converted.

In such a magnetic recording medium, extremely high surface smoothness of the magnetic layer is required in order to reduce the spacing loss and increase the recording density, and it is considered to correspond to this. . However, if the surface smoothness of the magnetic layer is increased in this way, the substantial contact area with the magnetic head becomes large, and the phenomenon of sticking (Brown stain) to the magnetic head surface of the magnetic layer easily occurs.
It causes level-down during playback.

Therefore, in such a magnetic recording medium, a lubricant is internally added to the magnetic layer, but it is difficult to avoid the above phenomenon only by this.
In some cases, a lubricant is further applied on the magnetic layer to which the lubricant is internally added to form a film called a top coat.

However, even if such a top coat is provided, the lubricant of this top coat diffuses into the magnetic layer, so that the concentration of the lubricant on the surface of the magnetic layer is reduced and the effect is weakened. In particular, after the magnetic recording medium is aged, the lubricant is exhausted, so that the effect of the lubricant is weakened.

Therefore, an organic substance such as a binder or a lubricant in the magnetic layer of the magnetic recording medium adheres to the surface of the magnetic head, and the organic substance is oxidized to form an adhered substance that cannot be wiped off by an ordinary solvent. Brown stain occurs in
It causes a level drop at the time of reproduction and a decrease in characteristics such as an increase in error rate.

On the other hand, as a method of removing the brown stain, there is a method of polishing the brown stain on the surface of the magnetic head with abrasive particles in the magnetic layer of the magnetic recording medium. Is significantly worn, and uneven wear is promoted, which is not preferable from the viewpoint of the product life of the magnetic head.

Further, since the content ratio of the magnetic powder in the magnetic layer of the magnetic recording medium is reduced, the electromagnetic conversion characteristics of the magnetic tape are significantly deteriorated.

As another method for removing the brown stain, there is a method of running a cleaning tape having a layer containing an abrasive on a support on a magnetic head to polish the brown stain on the surface of the magnetic head. However, this method also has the same inconvenience as the above-mentioned method.

In addition, the above-mentioned brown stain,
Abrasion powder containing a binder and the like generated from the magnetic tape is gradually accumulated in the ferrite portion of the magnetic head and then accumulated in the gap portion, causing head clogs and reducing the durability of the magnetic head.

As a method of eliminating such a head clog, there is a method of applying an organic substance to the surface of the magnetic head to prevent accumulation of brown stains and abrasion powder.
Examples of such an organic material include deck solvent (trade name) manufactured by ING Co., Ltd., and the like. The deck solvent is obtained by dissolving a perfluoro polyether perfluorocarbon _{(C n F 2n + 2)} , it is of the solution form to remove dirt of the magnetic head.
Further, in this deck solvent, since perfluoropolyether has a polar group, it is adsorbed to a metal, functions as a lubricant, and prevents adhesion of dirt.

Another method is also known, in which a perfluoropolyether having a carboxyl group at the terminal and an amine salt of a long-chain amine, which further enhances the binding force with a metal, are applied.

Although these methods are highly effective in preventing the accumulation of brown stains and abrasion powder on the surface of the magnetic head, when applying these organic substances to the surface of the magnetic head, they are all applied using a cotton swab or the like. Are doing
Since there are individual differences in the coating method and the like, the coating is not always performed under uniform conditions, and the effect is not always uniform.

[0014]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
It has been desired to develop a method capable of uniformly obtaining the effect of removing and accumulating deposits on the surface of the magnetic head without performing special maintenance.

Therefore, the present invention has been proposed in view of the conventional circumstances, and it is possible to uniformly obtain the effect of removing and accumulating deposits on the surface of the magnetic head, and to reduce the brown stain and head clog of the magnetic head. It is an object of the present invention to provide a cleaning tape that prevents the deterioration of characteristics such as an increase in error rate and also ensures the product life of the magnetic head.

[0016]

In order to solve the above-mentioned problems, the cleaning tape of the present invention comprises a binder, inorganic particles, and a perfluoropolyether having a carboxyl group at the end on one main surface side of a support. It is characterized in that a pigment layer containing at least an amine salt with a long-chain amine is formed.

At this time, a part of the long chain portion of the long chain amine may be replaced with fluorine.

The cleaning tape of the present invention comprises a cleaning coating containing at least a binder, inorganic particles, a perfluoropolyether having a carboxyl group at the terminal and an amine salt of a long-chain amine as a main component of a support. It is manufactured by coating the surface side to form a pigment layer.

The amine salt of a perfluoropolyether having a carboxyl group at the terminal and a long-chain amine is represented by the following chemical formula 1.
And a compound having a structure shown in Chemical formula 2.

[0020]

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[0021]

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Such an amine salt of perfluoropolyether having a carboxyl group at the terminal and a long-chain amine has a removing effect of wiping off the adhering matter adhering to the surface of the magnetic head, as well as a magnetic property after wiping off the adhering matter. It adheres to the head surface and functions as a protective film on the surface of the magnetic head, and also has an effect of preventing the adhered matter from adhering again.

In the cleaning tape of the present invention, the amine salt of perfluoropolyether having a carboxyl group at the terminal and a long-chain amine is 0.5 when the binder in the cleaning coating is 100 parts by weight. It is preferable to contain it in a proportion of 40 parts by weight to 40 parts by weight.

If the content of the amine salt is less than 0.5 parts by weight, the effect of the amine salt is weak, and if it is more than 40 parts by weight, the pigment layer becomes sticky and sticks easily to the magnetic head surface. Not preferable.

The amine salt of a perfluoropolyether having a terminal carboxyl group and a long-chain amine used in the present invention can be easily synthesized by the following method.

That is, a perfluoropolyether having a carboxyl group at the terminal and a long-chain amine (including a long-chain part in which a part of the long-chain portion is substituted with fluorine) are uniformly heated and stirred at a temperature above the melting point. It is easily synthesized by dissolving it in, and may be heated if necessary.

At this time, R ₁ R in the structural formula of the long-chain amine is
₂ R ₃ represents hydrogen, hydrocarbon or partially fluorinated hydrocarbon as described above, but the hydrocarbon or partially fluorinated hydrocarbon chain may contain a branch or a double bond. Further, the molecular chain may contain an aromatic ring.

The number of carbon atoms of R ₁ R ₂ R ₃ is not particularly limited, but at least one of them has preferably 7 or more carbon atoms, and particularly 10 or more has a solubility in a solvent. It is preferable because it has good properties.

On the other hand, as the structure of the main chain (R _f ) of perfluoropolyether having a carboxyl group at the terminal,
Examples thereof include, but are not limited to, those shown below.

Examples of the main chain of the monofunctional perfluoropolyether include those shown in Chemical formulas 3 to 5.

[0031]

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[0032]

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[0033]

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On the other hand, examples of the polyfunctional perfluoropolyether include those shown in Chemical formula 6.

[0035]

[Chemical 6]

The molecular weight of these perfluoropolyethers is not particularly limited, but if the molecular weight is too large, the effect of the terminal polar group becomes small, and if the molecular weight is too small, the effect of the perfluoropolyether group becomes weak.
It is preferably about 5,000.

In the cleaning tape of the present invention, the inorganic particles have a Mohs hardness of 5 or more,
The content is preferably 5 parts by weight or less when the binder is 100 parts by weight.

When the Mohs hardness of the inorganic particles is less than 5,
The cleaning effect of the cleaning tape on the magnetic head surface is weak, and the effect of removing the deposits on the magnetic head surface is weak.
As the inorganic particles, it is preferable to use those having a Mohs hardness of 10 or less so as not to promote abrasion of the magnetic head surface.

If the content of the inorganic particles is more than 5 parts by weight, abrasion of the magnetic head surface is promoted, which is not preferable.

Further, as such inorganic particles, those having an average particle size of about 0.002 μm to 1 μm are preferable, and 0.05 μm to 0.3 μm are more preferable. If the particle size of the inorganic particles is smaller than the above range, the running property of the cleaning tape is deteriorated, and if it is larger than the above range, the wear of the magnetic head surface is promoted, and the magnetic head surface is easily scratched, which is preferable. Absent.

As such inorganic particles, T
iO ₂ , SiO ₂ , SiC, Al ₂ O ₃ , Cr ₂ O ₃ ,
Examples include CrO ₂ , γ-Fe ₂ O ₃ , α-Fe ₂ O _{3 and the} like.

Examples of the binder include polyester resins, cellulose resins, polyurethane resins, vinyl chloride resins, vinyl chloride-vinyl acetate copolymers, vinyl chloride-vinyl acetate-vinyl alcohol copolymers, chlorides. Organic materials such as vinyl-vinylidene chloride copolymer, acrylonitrile-butadiene copolymer, phenol resin, epoxy resin, polyamide resin, polyvinyl butyral, nitrocellulose, cellulose acetate butyrate, acrylic resin, electron beam curable resin A high molecular compound is mentioned.

Each of these binders has advantages and disadvantages, and it is difficult to obtain the desired properties when used alone, and therefore two or more kinds may be used in combination.

Specifically, for example, vinyl chloride resin,
A relatively hard resin such as polyvinyl butyral or nitrocellulose may be used in combination with a relatively soft resin such as a polyester resin, a polyurethane resin or an acrylonitrile-butadiene copolymer. Further, a polyisocyanate compound is often used as a curing agent in order to prevent the powder in the pigment layer from falling off.

The amine salt of a perfluoropolyether having a carboxyl group at the terminal and a long-chain amine used in the cleaning tape of the present invention is, as described above, a perfluoropolyether having a carboxyl group at the terminal and a long-chain amine. Is synthesized by heating and stirring at a temperature equal to or higher than the melting point while uniformly dissolving. At this time, it is preferable to add the long-chain amine excessively so as not to leave unreacted perfluoropolyether. Then, a compound obtained by excessively adding an amine to an amine salt of a perfluoropolyether having a carboxyl group at the terminal and a long-chain amine thus produced is contained in the pigment layer, or a layer comprising the above compound is formed. It may be formed on the pigment layer.

In the cleaning tape of the present invention,
In addition to the inorganic particles that function as an abrasive in the pigment layer, an antistatic agent that reduces electric resistance to prevent dust from adhering to the surface of the magnetic head and prevents adhered substances may be contained. Examples of such an antistatic agent include a cationic polymer (trade name: PM-70) manufactured by Yoshimura Oil Chemical Co., Ltd., a quaternary ammonium salt, and the like. The content of the antistatic agent is preferably 0.5 to 10 parts by weight, more preferably 1 to 5 parts by weight, based on 100 parts by weight of the binder in the cleaning paint.

The cleaning tape of the present invention can be used not only as a cleaning tape, but also as a leader tape of an ordinary magnetic tape.

In the cleaning tape of the present invention,
The pigment layer formed on the one main surface side of the support contains at least a binder, inorganic particles, and an amine salt of a long-chain amine with perfluoropolyether having a carboxyl group at the terminal. When the cleaning tape is run on the surface of the magnetic head, the inorganic particles polish and remove the deposits attached to the surface of the magnetic head, and the amine salt wipes the surface of the magnetic head to remove the deposits. Also,
The amine salt adheres to the surface of the magnetic head after removing the deposits to form a film, and functions as a protective film to prevent the deposits from adhering again.

Further, according to the cleaning tape of the present invention, since the adhered matter is removed by polishing and wiping, the surface of the magnetic head is not excessively polished.

[0050]

EXAMPLES Preferred examples of the present invention will be described below based on experimental examples, but it goes without saying that the present invention is not limited to these examples.

Here, various cleaning tapes were manufactured by changing the kind of lubricant in the pigment layer, and these cleaning tapes were connected to both ends of the magnetic tape as leader tapes of the magnetic tape.
The error rate when the magnetic tape was run and the occurrence of brown stain were investigated.

That is, in the connecting portion between the leader tape and the magnetic tape of the above-mentioned magnetic tape, as shown in FIG. 1, a magnetic film is formed on the main surface 1a side of the non-magnetic support 1 which is a base film made of polyethylene terephthalate or the like. Layer 2
Thus, at least the binder and the pigment layer 3 containing the inorganic pigment and the lubricant are formed adjacent to each other.

Here, the magnetic tape and the cleaning tape are manufactured separately and then connected to each other. However, after the magnetic layer 2 is formed on the non-magnetic support 1,
Subsequently, the pigment layer 3 may be formed.

Example 1 First, a cleaning tape was manufactured. That is, first, a pigment layer coating material having the following composition was prepared.

(Pigment layer paint formulation) γ-Fe ₂ O ₃ magnetic powder 100 parts by weight Al ₂ O ₃ 20 parts by weight Vinyl chloride-vinyl acetate copolymer 10.5 parts by weight Polyurethane resin 10.5 parts by weight quaternary Ammonium salt 5 parts by weight Methyl ethyl ketone 150 parts by weight Toluene 150 parts by weight Cyclohexanone 100 parts by weight Lubricant 1 5 parts by weight In addition, Table 1 shows the characteristics of the lubricant 1.

[0056]

[Table 1]

The materials having the above composition were mixed by a ball mill for 24 hours, taken out through a filter, 4 parts by weight of a polyisocyanate compound as a curing agent was further added thereto, and the mixture was stirred for 30 minutes. Then, apply this pigment layer paint 8
A non-magnetic support having a thickness of μm and made of polyethylene terephthalate was coated on one main surface so that the thickness after drying was 3 μm, and then dried and wound. In addition, 1/2
It was cut into inch width and used as a cleaning tape.

Next, a magnetic tape was manufactured. That is,
First, a magnetic paint having the following composition was prepared.

(Magnetic coating compound) Metal magnetic powder 100 parts by weight Antistatic agent (carbon) 5 parts by weight Vinyl chloride-vinyl acetate copolymer 10.5 parts by weight Polyurethane resin 10.5 parts by weight Stearic acid butyl ester 2 parts by weight Methyl ethyl ketone 150 parts by weight Toluene 150 parts by weight Cyclohexanone 100 parts by weight The materials having the above-mentioned composition were mixed in a ball mill for 24 hours and then taken out through a filter. This magnetic coating material was applied onto one main surface of a non-magnetic support made of polyethylene terephthalate having a thickness of 8 μm so that the thickness after drying would be 3 μm, magnetic field orientation was performed, and then dried and wound. This was calendered and then cut to a width of 1/2 inch to produce a magnetic tape.

Next, the above-mentioned cleaning tape was attached as a leader tape to both ends of this magnetic tape to manufacture the magnetic tape of Example 1 having the structure as shown in FIG.

Then, the magnetic tape of Example 1 was run on a TSS type magnetic head for 24 hours under the conditions of a temperature of 25 ° C. and a humidity of 60% RH, and the error rate was increased and the brown color was increased as the level was lowered. The presence or absence of stain was investigated. Also, the conditions are a temperature of 40 ° C. and a humidity of 20.
The same investigation was conducted as% RH. Table 2 shows the results.

[0062]

[Table 2]

In Table 2, the result of presence / absence of the occurrence of brown stain is indicated by ◯ when the sendust portion of the magnetic head is not dirty and the brown stain is not generated, and the sendust portion of the magnetic head is slightly small. A state in which the stain is dirty and brown stain is generated is indicated by Δ, and a state in which the sendust portion of the magnetic head is changed by more than half is indicated by x.

Examples 2 to 14 Lubricants 2 to 14 having the structures shown in Table 1 were added instead of the lubricant 1 in the pigment layer coating material of the cleaning tape used in Example 1. Example 1
The pigment layer coating materials were prepared as described above, and 13 kinds of cleaning tapes were manufactured in the same manner as described in Example 1 using the pigment layer coating materials.

Subsequently, the magnetic tape as described in Example 1 was manufactured, and 13 kinds of cleaning tapes were attached to both ends of the magnetic tape as leader tapes to manufacture the magnetic tapes of Examples 2 to 14. did.

Then, the error rates of the magnetic tapes of Examples 2 to 14 and presence / absence of brown stain were examined in the same manner as in Example 1. The results are also shown in Table 2.

Comparative Examples 1 to 3 Instead of the lubricant 1 in the paint for the pigment layer of the cleaning tape used in Example 1, stearic acid butyl ester or stearic acid which is a commonly used lubricant is used. Each of them was added to prepare a pigment layer coating material as described in Example 1, and two types of cleaning tapes were manufactured as described in Example 1 using these pigment layer coating materials.

Subsequently, the magnetic tape as described in Example 1 was manufactured, and the above two kinds of cleaning tapes were attached as leader tapes to both ends of the magnetic tape, and the magnetic tapes of Comparative Examples 1 and 2 were attached. Manufactured.

Further, the pigment layer coating material was prepared as described in Example 1 without adding a lubricant, and the cleaning tape was manufactured as described in Example 1 using this pigment layer coating material. .

Subsequently, the magnetic tape as described in Example 1 was manufactured, and the above-mentioned cleaning tape was attached as a leader tape to both ends of this magnetic tape to manufacture the magnetic tape of Comparative Example 3.

Then, the error rates of the magnetic tapes of Comparative Examples 1 to 3 and presence / absence of brown stain were examined in the same manner as in Example 1. The results are also shown in Table 2.

As is clear from the results shown in Table 2, the binder and the inorganic particles, and the perfluoro group having a carboxyl group at the terminal, were applied to the pigment layer formed on the one main surface side of the support to which the present invention was applied. In Examples 1 to 14 in which the cleaning tape containing at least an amine salt of a polyether and a long-chain amine was used as the leader tape, the error rate was small and deterioration of the characteristics of the magnetic head was prevented.
It was confirmed that the occurrence of brown stain was also suppressed.

Since the error rate is small and the occurrence of brown stain is suppressed, the occurrence of head clogs is also suppressed, the product life of the magnetic head is ensured, and the durability of the magnetic recording system is ensured. Has been done.

In Examples 1 to 14, the inorganic particles polish and remove the deposits attached to the magnetic head surface, and the amine salt wipes the magnetic head surface to remove the deposits. In addition, the amine salt adheres to the surface of the magnetic head after removing the deposits to form a film,
It seems that it functions as a protective film to prevent the deposits from reattaching.

Then, Examples 1 to 14 to which the present invention is applied
In the above, since the adhered substances are removed by polishing and wiping, the surface of the magnetic head is not excessively polished.

Therefore, by using the cleaning tape of the present invention, the occurrence of head clogs and brown stains can be suppressed, and the durability of the magnetic recording system can be improved under any use condition such as low temperature, and it can be maintained for a long time. Can be kept.

Further, by using the cleaning tape to which the present invention is applied, the surface of the magnetic head can be cleaned without touching other parts of the magnetic head.
Cleaning is performed without invading the parts other than the magnetic head surface.

Furthermore, when the cleaning tape to which the present invention is applied is used, a complicated operation such as application with a cotton swab is eliminated, and there is no individual difference in the operation. Makes maintenance very easy and quick.

[0079]

As is clear from the above description, in the cleaning tape of the present invention, the binder and the inorganic particles and the carboxyl group at the end are contained in the pigment layer formed on the one main surface side of the support. Containing at least an amine salt of perfluoropolyether and a long-chain amine, when such a cleaning tape is run on the surface of the magnetic head, the above-mentioned inorganic particles polish the deposit adhered to the surface of the magnetic head. Along with the removal, the amine salt wipes the surface of the magnetic head to remove deposits. Further, the amine salt,
After the deposits are removed, they adhere to the surface of the magnetic head to form a film, which functions as a protective film to prevent the deposits from reattaching.

Further, according to the cleaning tape of the present invention, since the adhered substances are removed by polishing and wiping, the surface of the magnetic head is not excessively polished.

Therefore, when the cleaning tape of the present invention is used, the occurrence of head clogs and brown stains can be suppressed, the deterioration of characteristics such as an increase in error rate can be prevented, and the product life of the magnetic head can be secured. The durability of the magnetic recording system can be improved under any use condition such as under, and it can be maintained for a long period of time.

[Brief description of drawings]

FIG. 1 is an enlarged sectional view of an essential part showing a magnetic tape using a cleaning tape to which the present invention is applied.

[Explanation of symbols]

 1 non-magnetic support 2 magnetic layer 3 pigment layer

Claims (2)

[Claims] 1. A pigment layer comprising at least one binder, inorganic particles, and an amine salt of a perfluoropolyether having a carboxyl group at a terminal and a long-chain amine is formed on one main surface of a support. A cleaning tape that is characterized by being 2. The cleaning tape according to claim 1, wherein a part of the long chain portion of the long chain amine is replaced with fluorine.