JPH08161714A - Cleaning tape - Google Patents

Abstract

PURPOSE: To obtain a cleaning tape which enables effective removal of soil while allowing the maintaining of clean condition for a long time by holding perfluoropolyether having a carboxyl group at a terminal on a ground fabric. CONSTITUTION: Fig. (a) shows a head 1 to which adheres soil 3 such as dust, dirt, matters chipped off a magnetic layer and a cleaning tape 2 arranged as opposed thereto. A cleaning liquid containing a perfluoro compound 4 is held on one main surface of the tape 2. To clean up, the tape 2 is kept in contact with the magnetic head 1 as indicated by Fig. (b) and runs in one direction of the arrow A. As a result, the soil 3 adhering to the magnetic head 1 is wiped out effectively being contacted by the tape 2 running while the perfluoro compound 4 held on the tape 2 is transferred onto the magnetic head 1 to form a film of the perfluoro compound 4 on the surface of the magnetic head 1 as indicated by Fig. (c). The film allows the magnetic head 1 having it thereon to prevent foul from adhering thereto by acting as protective layer and thus, the soil is kept hard to accumulate on the magnetic head thereby enabling maintaining of clean condition for a long time.

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.

[0002]

2. Description of the Related Art In a magnetic head for recording / reproducing a magnetic signal on / from a magnetic tape, for example, dust and dirt, and even fallen objects dropped from the magnetic layer often adhere to the tape sliding surface as dirt. . If the dirt attached to the magnetic head is left as it is, it may cause head clogs or damage the magnetic tape or the magnetic head itself. For this reason, it has been conventionally practiced to use a wet cleaning tape in which a base cloth material made of polyethylene terephthalate or the like is impregnated with an alcohol serving as a cleaning liquid, and to run the wet cleaning tape against a magnetic head to wipe off dirt. It is being appreciated.

When this cleaning tape is applied to a recording / reproducing system in which a magnetic tape is housed in a cassette case, as shown in FIG. 2, the cassette has a shape substantially the same as that of the cassette case housing the magnetic tape. It is housed in a case and used as a cleaning tape cassette. That is, the cleaning tape cassette has an upper half 21a and a lower half 2 as shown in FIG.
Cassette case 21 configured by combining with 1b
A tape reel 22 is rotatably supported in the inside of the tape reel 22, and the base cloth material 23 of the cleaning tape is wound around the tape reel 22. The upper half 21a is provided with a cleaning liquid inlet 24 for supplying alcohol as a cleaning liquid to the cleaning tape.

To clean the magnetic head with this cleaning tape cassette, alcohol is injected from the cleaning liquid injection port 24 provided in the upper half 21a of the cleaning tape cassette. Then, the alcohol drops into the base cloth material 23 in the cassette case 21 and permeates the base cloth material 23. Then, the cleaning tape cassette to which the alcohol has been supplied is set at the position of the tape cassette of the recording / reproducing system where the magnetic head should be cleaned, and the reproducing mode is set to bring the cleaning tape into contact with the magnetic head. . As a result, the dirt attached to the magnetic head is wiped off and the tape sliding surface is restored to a clean state.

[0005]

However, even if the magnetic head is cleaned in this manner, dust, dust, and fallen substances dropped from the magnetic layer are deposited on the magnetic head again in a short period of time. For this reason, there is a situation in which the head operation is performed in a state in which the dirt is attached, a sufficient still time cannot be obtained, and the head life is short.

Therefore, the present invention has been proposed in view of the above-mentioned conventional circumstances, and provides a cleaning tape having a high cleaning effect and maintaining a cleaned magnetic head in a clean state for a long time. The purpose is to

[0007]

In order to achieve the above object, the cleaning tape of the present invention comprises a base cloth material, a perfluoropolyether having a carboxyl group at the terminal,
Ester compound of perfluoropolyether having terminal carboxyl group and long-chain alcohol, ester compound of perfluoropolyether having hydroxyl group and long-chain carboxylic acid, or perfluoropolyether having terminal carboxyl group and long-chain amine One of the amine salts of and is retained.

The cleaning tape is formed by impregnating a base cloth material with a cleaning liquid, and one side surface of the cleaning tape is brought into contact with the magnetic head to clean the magnetic head. In the present invention, as a cleaning liquid for such a cleaning tape, a perfluoropolyether having a carboxyl group at the terminal, an ester compound of a perfluoropolyether having a carboxyl group at the terminal and a long chain alcohol, a perfluoropolyether having a hydroxyl group. An ester compound of an ether and a long-chain carboxylic acid or an amine salt of a perfluoropolyether having a carboxyl group at the terminal and an amine salt of a long-chain amine is dissolved in a solvent.

1A to 1C show how a magnetic head is cleaned with a cleaning tape using a cleaning liquid containing these perfluoro compounds. First, FIG. 1A shows a state in which the cleaning tape 2 and the head 1 to which the dirt 3 such as dust, dust, and fallen material dropped from the magnetic layer adheres, are opposed to each other. A cleaning liquid containing a perfluoro compound 4 is held on one main surface of the cleaning tape 2. To perform cleaning, the cleaning tape 2 is brought into contact with the magnetic head 1 as shown in FIG. 1 (b) and is run in one direction (direction of arrow A in the figure). Then, the dirt 3 adhering to the magnetic head 1 is effectively wiped off by being brought into contact with the cleaning tape 2 and traveling. Also,
At the same time, in this cleaning tape 2, the retained perfluoro compound 4 moves to the magnetic head,
As shown in FIG. 1C, a film of perfluoro compound 4 is formed on the surface of the magnetic head 1. In the magnetic head 1 on which such a coating is formed, the coating acts as a protective layer to prevent dirt from adhering, dirt is hard to accumulate, and a clean state is maintained for a long period of time. Become.

As described above, according to the present invention, the base cloth material is a perfluoropolyether having a carboxyl group at the terminal, an ester compound of a perfluoropolyether having a carboxyl group at the terminal and a long-chain alcohol, and a perfluoro group having a hydroxyl group. Either an ester compound of a polyether and a long-chain carboxylic acid or an amine salt of a long-chain amine and a perfluoropolyether having a carboxyl group at the terminal is retained. The specific molecular constitutions of these compounds are as follows.

(1) Perfluoropolyether having a carboxyl group at the terminal The perfluoropolyether having a carboxyl group at the terminal is represented by the general formula (1).

[0012]

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The molecular weight of this compound is preferably about 600 to 5,000. When the molecular weight is less than 600, the cleaning performance and the effect as a protective layer for preventing the adhesion of dirt are insufficient, and when it exceeds 5,000, the solubility in a solvent becomes poor. As such a perfluoropolyether, the product name Deck Solvent DS-100
There is 0DG.

(2) Ester Compound of Perfluoropolyether Having Carboxyl Group at Terminal and Long-Chain Alcohol The ester compound of perfluoropolyether having carboxyl group at the terminal and long-chain alcohol is represented by Chemical Formula 2 and Chemical Formula 3
Is represented by the general formula

[0015]

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[0016]

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In this compound, the perfluoropolyether having a carboxyl group may be a monofunctional perfluoropolyether or a polyfunctional perfluoropolyether. Examples of the monofunctional perfluoropolyether include those represented by Chemical formulas 4 and 5, and examples of the polyfunctional perfluoropolyether include those represented by Chemical formulas 6.

[0018]

[Chemical 4]

[0019]

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[0020]

[Chemical 6]

On the other hand, the long-chain hydrocarbon R in the long-chain alcohol portion is a hydrocarbon having 6 or more carbon atoms. This hydrocarbon R
May contain an aromatic ring, a double bond, a branched structure, or an alicyclic structure, but is preferably a linear hydrocarbon having 10 or more carbon atoms. The molecular weight of this compound is 600 ~
About 5000 is desirable. When the molecular weight is less than 600, the cleaning performance and the effect as a protective layer for preventing the adhesion of dirt are insufficient, and when it exceeds 5,000, the effect of the ester group becomes small and the solubility in the solvent becomes poor.

(3) Ester Compound of Perfluoropolyether Having Hydroxyl Group and Long-Chain Carboxylic Acid The ester compound of perfluoropolyether having hydroxyl group and long-chain carboxylic acid is represented by the general formulas (7) and (8). It is a thing.

[0023]

[Chemical 7]

[0024]

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In this compound, the perfluoropolyether having a hydroxyl group may be a monofunctional perfluoropolyether or a polyfunctional perfluoropolyether. Examples of the monofunctional perfluoropolyether include those represented by Chemical formulas 9 and 10, and examples of the polyfunctional perfluoropolyether include those represented by Chemical formulas 11.

[0026]

[Chemical 9]

[0027]

[Chemical 10]

[0028]

[Chemical 11]

On the other hand, the long-chain hydrocarbon R in the long-chain carboxylic acid moiety is a hydrocarbon having 6 or more carbon atoms. This hydrocarbon R
May contain an aromatic ring, a double bond, a branched structure, or an alicyclic structure, but is preferably a linear hydrocarbon having 10 or more carbon atoms. The molecular weight of this compound is 600 ~
About 5000 is desirable. When the molecular weight is less than 600, the cleaning performance and the effect as a protective layer for preventing the adhesion of dirt are small, and when the molecular weight is more than 5000, the effect of the ester group is small and the solubility in the solvent is deteriorated.

(4) Amine salt of perfluoropolyether having terminal carboxyl group and long-chain amine The amine salt of perfluoropolyether having terminal carboxyl group and long-chain amine is represented by Chemical Formulas 12 and 13 It is represented by a general formula.

[0031]

[Chemical 12]

[0032]

[Chemical 13]

In this compound, the perfluoropolyether having a carboxyl group may be a monofunctional perfluoropolyether or a polyfunctional perfluoropolyether. Examples of the monofunctional perfluoropolyether include those represented by Chemical formulas 14 and 15, and examples of the polyfunctional perfluoropolyether include those represented by Chemical formulas 16.

[0034]

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[0035]

[Chemical 15]

[0036]

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On the other hand, R ¹ , R ² , R ^{3 of} the long-chain amine moiety,
R ⁴ is a long chain hydrocarbon having 6 or more carbon atoms or H. In the case of this long chain hydrocarbon, an aromatic ring, a double bond, a branched structure,
It may contain an alicyclic structure, but has 10 carbon atoms.
The above straight-chain hydrocarbons are desirable. The molecular weight of this compound is preferably about 600 to 5,000. If the molecular weight is too large, the effect of the amine salt will be small and the solubility in the solvent will be poor.

The solvent for dissolving the perfluoro compound may be any solvent capable of dissolving the perfluoro compound, such as alcohol, hexane, and Freon. The concentration of the perfluoro compound dissolved in the solvent is suitably 0.05 to 5% by weight. If the concentration of the perfluoro compound is less than 0.05% by weight, the effect of the perfluoro compound cannot be sufficiently obtained, and if it exceeds 5% by weight, the perfluoro compound excessively adheres to the head, After that, when the tape is run, sticking of the tape may occur.

As the base cloth material impregnated with the cleaning liquid, a tape-like cloth material made of polyethylene terephthalate or the like which is usually used in cleaning tapes can be used. For example, Toray's product name Toraysee and Kuraray's product name Wiping Cloth are suitable. The cleaning tape having such a configuration is housed in, for example, a cassette case and used in the form of a cleaning cassette. The tape width and the shape of the cassette case can be appropriately selected according to the recording / reproducing system used.

[0040]

[Function] A perfluoropolyether having a carboxyl group at the terminal, an ester compound of a perfluoropolyether having a carboxyl group at the terminal and a long-chain alcohol,
In a cleaning tape holding a cleaning liquid containing an ester compound of a perfluoropolyether having a hydroxyl group and a long-chain carboxylic acid or an amine salt of a perfluoropolyether having a carboxyl group at the terminal and a long-chain amine, Dust and dirt adhering to the magnetic head when the magnetic head is brought into contact with the magnetic head, and dirt such as fallen material dropped from the magnetic layer are effectively wiped off. At the same time, in this cleaning tape, these perfluoro compounds held by the base cloth material migrate to the magnetic head to form a film.

In the magnetic head having such a coating formed thereon, the coating acts as a protective layer to prevent dirt from adhering, dirt is hard to accumulate, and a clean state is maintained for a long period of time. . Therefore, it is possible to prevent the head clog, the deterioration of the still characteristics, and the scratch caused by the accumulation of dirt, and to obtain a long head life.

[0042]

EXAMPLES Preferred examples of the present invention will be described based on experimental results. The perfluoro compounds (compounds 1 to 16) contained in the cleaning liquid in this example are chemical compounds 1
7 or Chemical Formula 18, Rf, R and those having a molecular weight as shown in Table 1, Chemical Formula 19 or Chemical Formula 20, Rf,
R and molecular weight are as shown in Table 2, represented by Chemical Formula 21 or Chemical Formula 22, and Rf, R ¹ , R ² , R ³ , R ⁴ and molecular weight are as shown in Table 3 and Chemical Formula 23, respectively. It is something. In the following experiments, a cleaning tape containing these perfluoro compounds was impregnated into a cleaning tape,
The cleaning performance was evaluated.

[0043]

[Chemical 17]

[0044]

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[0045]

[Table 1]

[0046]

[Chemical 19]

[0047]

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[0048]

[Table 2]

[0049]

[Chemical 21]

[0050]

[Chemical formula 22]

[0051]

[Table 3]

[0052]

[Chemical formula 23]

Example 1 A tape-shaped polyethylene terephthalate cloth material slit by a width of 12.65 mm (trade name: Toraysee, manufactured by Toray Industries, Inc.)
Prepared by Kuraray Co., Ltd., product name Wiping cloth), and VH
It was incorporated in a cassette case for cleaning tape of S type specification. Then, a cleaning liquid prepared by dissolving Compound 1 which is an ester compound of perfluoropolyether having a carboxyl group at the terminal and a long-chain alcohol in ethanol at a ratio of 3.0% by weight from a cleaning liquid injection port of this cassette case. 7 drops were injected into a cleaning tape cassette.

Examples 2 to 5 As cleaning liquids, Compounds 2 to 5, which are ester compounds of perfluoropolyether having a carboxyl group at the terminal and a long-chain alcohol, were added to ethanol.
A cleaning tape cassette was assembled in the same manner as in Example 1 except that the one dissolved at a ratio of 0% by weight was used.

Examples 6 to 10 As the cleaning liquid, compounds 6 to 10 which are ester compounds of a perfluoropolyether having a hydroxyl group and a long-chain carboxylic acid were dissolved in hexane at a ratio of 3.0% by weight. A cleaning tape cassette was assembled in the same manner as in Example 1 except that the cleaning tape cassette was used.

Examples 11 to 15 As a cleaning liquid, compounds 11 to 15 which are amine salts of perfluoropolyether having a carboxyl group at the terminal and a long-chain amine were added to ethanol at a ratio of 3.0% by weight. A cleaning tape cassette was assembled in the same manner as in Example 1 except that the melted one was used.

Example 16 The same procedure as in Example 1 was repeated except that as the cleaning liquid, a compound 16 which was a perfluoropolyether having a carboxyl group at the terminal was dissolved in ethanol at a ratio of 3.0% by weight. I assembled the cleaning tape cassette.

Comparative Example 1 A cleaning tape cassette was assembled in the same manner as in Example 1 except that ethanol in which the perfluoropolyether compound was not dissolved was used as the cleaning liquid.

The cleaning performance of the cleaning tape cassette manufactured as described above was evaluated. The evaluation is a VHS type VTR (trade name AG- manufactured by JVC).
6200). First, with this VTR, a video tape with a relatively large amount of powder falling is run to attach dirt to the video head. Next, a commercially available VHS tape was recorded / reproduced with a reference signal having a recording wavelength of 1.3 μm, and RF was used.
Make sure there is no output.

Then, the produced cleaning tape cassette is run in the reproduction mode for 10 seconds to clean the video head. After this cleaning, the degree of stain removal on the head and the presence or absence of scratches on the head were observed and the still time was measured. The results are shown in Table 4 and Table 5.
Shown in The condition of the stain removal of the head and the presence of scratches were observed with a microscope. Of these, the degree of dirt removal of the head was evaluated on a scale of five. The smaller the score is, the less the dirt is and the more clean it is.

The still time is a temperature of 5 ° C. and a recording wavelength of 1.3.
It was determined by performing still reproduction on a commercially available VHS tape on which a μm reference signal was recorded and measuring the time until the RF output decreased by 6 dB. Further, with respect to the cleaning tape cassettes of Example 16 and Comparative Example 1, after cleaning, the unused VHS tape was replaced and continuously run, and the time until the head clog was measured.

[0062]

[Table 4]

[0063]

[Table 5]

As shown in Tables 4 and 5, the heads cleaned with the cleaning tape cassettes of Examples 1 to 16 in which the cleaning liquid contained a predetermined perfluoro compound contained the cleaning liquid containing the perfluoro compound. The dirt removal is better than that of the head cleaned with the cleaning tape cassette of Comparative Example 1 which is not contained. Further, when the VHS tape is run after cleaning, dirt is not easily attached, and the still time and the time to reach the head clog are long.

From the above, it is very effective to make the cleaning liquid impregnated in the cleaning tape contain a predetermined perfluoro compound in order to sufficiently remove dirt on the head and to maintain the head in a clean state for a long time. I found out.

Examination of Concentration of Perfluoro Compound Next, the proper concentration of the perfluoro compound contained in the cleaning liquid was examined.

Cleaning was performed in the same manner as in Example 1 except that cleaning liquids having various concentrations of perfluoro compounds (compound 3, compound 8, compound 13, compound 16) were used as shown in Tables 6 to 9. The tape cassette was assembled. Then, in the same manner as described above, cleaning was performed on the video head to which dirt was attached, and the degree of dirt removal of the head after cleaning, the presence or absence of scratches on the head, and the still time were measured. The results are shown in Tables 6 to 9 together with the composition of the cleaning liquid.

[0068]

[Table 6]

[0069]

[Table 7]

[0070]

[Table 8]

[0071]

[Table 9]

As shown in Tables 6 to 9, the amount of the perfluoro compound contained in the cleaning liquid was 0.02% by weight.
If the cleaning tape cassette is too small and the amount of the perfluoro compound is 8.0% by weight, the amount of the perfluoro compound is 0.1 to 0.1% by weight.
Compared to the 4.5% by weight cleaning cassette, the dirt of the head is inferior in cleanness, and the still time after cleaning is short. Therefore, the amount of perfluoro compound contained in the cleaning liquid is 0.05.
~ 5% by weight is suitable.

[0073]

As is apparent from the above description,
Since the cleaning tape of the present invention is impregnated with the cleaning liquid containing the predetermined perfluoro compound, the dirt adhering to the magnetic head can be effectively wiped off and the cleaned magnetic head will not accumulate dirt. It is difficult and its clean state is maintained for a long time. Therefore, in the magnetic head thus cleaned, the head clog, the deterioration of the still characteristics, and the scratch caused by the accumulation of dirt are prevented, and the long head life is obtained.

[Brief description of drawings]

FIG. 1 is a schematic view showing a state in which a magnetic head is cleaned with a cleaning tape, and (a) is a schematic view showing a state where a head and a cleaning tape are opposed to each other. It is a schematic diagram which shows the state currently cleaned, (c)
FIG. 3 is a schematic view showing a coating film formed on a magnetic head by cleaning.

FIG. 2 is a perspective view showing a general configuration of a cleaning tape cassette.

[Explanation of symbols]

 1 head 2 cleaning tape

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Masataka Takano 6-735 Kita-Shinagawa, Shinagawa-ku, Tokyo Sony Corporation

Claims (4)

[Claims] 1. A cleaning tape comprising a base cloth material and perfluoropolyether having a carboxyl group at the end thereof. 2. A cleaning tape comprising a base cloth material, and an ester compound of a perfluoropolyether having a carboxyl group at a terminal and a long-chain alcohol held therein. 3. The cleaning tape according to claim 3, wherein the base cloth material holds an ester compound of perfluoropolyether having a hydroxyl group and a long-chain carboxylic acid. 4. A cleaning tape, characterized in that a base cloth material holds an amine salt of a perfluoropolyether having a carboxyl group at a terminal and a long-chain amine.