JPS5829980B2 - Surface treatment agent for recording and reproducing materials - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a surface treatment agent for recording and reproducing materials, and more specifically, the present invention relates to a surface treatment agent for recording and reproducing materials. The present invention relates to a novel surface treatment agent for recording and reproducing materials, which can impart a long-lasting antistatic effect to the surface of records and the like, as well as an effect of reducing the distortion rate of sound quality.

Various types of antistatic agents have been known for use in recording and reproducing materials such as records, video discs, and magnetic tapes, and hydrocarbon-based cationic surfactants are generally used.

The antistatic agent is commercially available as an organic solvent or water solution.

Usually, antistatic treatment is performed by applying such a solution to the surface of a record or the like and drying it.

As a result of various studies and studies on antistatic agents for records, etc., the present inventor has found that cationic or amphoteric fluorinated surfactants containing polyfluoroalkyl groups can exhibit various excellent advantages. We have obtained new knowledge.

In other words, fluorinated surfactants not only have significantly superior antistatic performance compared to hydrocarbon surfactants, but also
It was also discovered that it is significantly superior in terms of durability and low friction properties.

For example, when applied to the surface of a record, fluorinated surfactants have good adsorption and excellent penetration into minute grooves, making them much more durable than hydrocarbon surfactants. It is.

Furthermore, the sound quality is improved due to the low friction imparting effect.

We have newly discovered that a solution prepared by dissolving a small amount of a fluorinated surfactant in a solvent such as trichlorotrifluoroethane or isopropanol can exhibit the above-mentioned effects well. The cationic or amphoteric fluorinated surfactant has a boiling point of 20 to 100 which dissolves the fluorinated surfactant and is inactive on the surface of the recording/reproducing material.
Regarding antistatic agents for recording and reproducing materials that are dissolved in a solvent at a temperature of 1 wt. Kaisho 55-89376
A patent application was filed earlier.

As a result of further research and consideration regarding the above-mentioned surface treatment agent, the present inventor has discovered that by adding and mixing a small amount of a multifluorinated organic compound with a melting point of 150'C or less to the above-mentioned surface treatment agent, a record It has been found that the effect of reducing the frictional force caused by needles and the like is enhanced, and therefore the distortion rate of sound quality can be reduced favorably.

When such a surface treatment agent is applied to the surface of a record, etc., its antistatic effect prevents dust from adhering to it, and it also prevents scratch noise, which works well with the aforementioned effect of reducing frictional force. Therefore, the advantages as a surface disintegration treatment agent are improved.

Furthermore, the durability of the various effects mentioned above is also very excellent.

Therefore, unlike solvents, certain multifluorinated organic compounds have a boiling point of 110°C or higher, and unlike fluorinated surfactants, they have a solubility in water of 0.5% or less at room temperature. Selected.

Thus, the present invention was completed based on the above findings, and a cationic or amphoteric fluorinated surfactant having a perfluoroalkyl group having 4 to 20 carbon atoms is
A concentration of 1% by weight is added to an organic solvent with a boiling point of 40 to 100°C that dissolves the fluorinated surfactant and is inert to the surface of the recording/reproducing material.
In the composition dissolved below, the boiling point is 110 ° C.
A polyfluorinated organic compound having a fluorine content of 30% by weight or more and having a melting point of 1200C or less and a solubility in water at room temperature of 0.5% or less is added and mixed at a concentration of 1% by weight or less. The present invention provides a novel surface treatment agent for recording and reproducing materials characterized by the following.

In the present invention, it is important to use a cationic or amphoteric fluorinated surfactant; nonionic or anionic surfactants are insufficient for imparting antistatic properties.

Of course, hydrocarbon surfactants have even less satisfactory performance than fluorinated surfactants, and have drawbacks in terms of durability and imparting low friction properties.

For example, by applying the composition of the present invention to the surface of a record and drying it, the surface electrical resistance of an untreated record, which is 2.9×10 15 Ω, can be reduced to 2×10 12 Ω or less.

In addition, when using a fluorinated anionic surfactant, a fluorinated nonionic surfactant, or a hydrocarbon cationic surfactant, it is difficult to reduce the surface electrical resistance to the above level, and a large amount of coating is required. Even if this could be achieved, it would have a significant impact on sound quality, such as the generation of noise.

Furthermore, records treated with the composition of the present invention retain their effects even after repeated sound reproduction, and are free from problems such as noise and have excellent sound quality.

In the present invention, the polyfluoroalkyl group-containing fluorinated surfactant is not particularly limited, and a wide range of conventionally known and well-known surfactants can be employed.

The polyfluoroalkyl group preferably has 4 to 20 carbon atoms, usually a perfluoroalkyl group, and preferably 6 to 18 carbon atoms.

Of course, the polyfluoroalkyl group may be linear or branched, and may partially contain hydrogen atoms, chlorine atoms, etc.
Alternatively, it may contain an ether bond.

As the polyfluoroalkyl group, one in which at least the end portion is a perfluoroalkyl group is preferably selected.

Suitable examples of fluorinated amphoteric surfactants include ■/R
2 Betaine type amphoteric surfactants represented by the general formula RfW-N-R, etc.

In the formula, Rf is a polyfluoroalkyl group having 4 to 20 carbon atoms, particularly a perfluoroalkyl group having 6 to 18 carbon atoms, and W is a divalent organic bonding group, preferably QR-
It is.

Q is -C0N(R')- or 5O2N(R1)-, R1 is a hydrogen atom or a lower alkyl group having 1 to 4 carbon atoms, and R is a divalent alkylene group having 1 to 10 carbon atoms. .

R2 and R3 are an alkyl group, a hydroxyalkyl group, or ACOOM, and may also be -WR4 in some cases,
R2 and R3 can be the same or different groups.

A is a divalent alkylene group having 1 to 3 carbon atoms, and M is an alkali metal such as sodium or potassium or -NH4.

Z is -ACOOo, -ASO'P○ It is an anionic group such as.

Specific examples include, U.S. Patent No. 3836552, Japanese Patent Publication No. 48-23161, U.S. Patent No. 3839425.
It is stated in the number specification etc.

In addition, JP-A-48-44182, JP-A-51-
Polyfluoroalkyl group-containing amphoteric surfactants and glycine-type fluorinated amphoteric surfactants such as those described in Japanese Patent No. 125213 and the like may also be used.

Furthermore, Japanese Patent Application No. 128717/1983
Fluorinated amphoteric surfactants containing a piperazine ring described in Japanese Patent Application No. 14719) and Japanese Patent Application No. 53-555
Polyfluoroalkyl group-containing amphoteric surfactants described in Specification No. 30 (Japanese Unexamined Patent Publication No. 57-26719) may also be used. ○ Suitable examples of fluorinated cationic surfactants are ■/R
4 Then, the quaternary ammonium ○\R of the general formula RfQRN-R5
0 Nium salts are mentioned.

In the above formula, Rf is a polyfluoroalkyl group having 4 to 20 carbon atoms, particularly a perfluoroalkyl group having 6 to 18 carbon atoms, and Q is -C0N(R')- or -802N
(R”)-, R1 is a hydrogen atom or has 1 to 4 carbon atoms
R is a divalent alkylene group having 1 to 10 carbon atoms.

R4, R5, and R6 are hydrogen atoms, alkyl groups, hydroxyalkyl groups, or -ACOOM, A is a divalent alkylene group having 1 to 3 carbon atoms, and M is an alkali metal such as sodium or potassium, or -NH4 It is.

X is a halogen atom, -H804゜-CH3804, -H
2PO4, -CH3COO or CH2ClCOO.

In addition, R may be linear or branched, and further R4, R5,
One of R6, R1 and R may form a ring.

In addition, in the present invention, US Pat. No. 4,062,849
Perfluoropolycationic interfaces such as those described in US Pat. Fluorinated cationic surfactants such as surfactants can also be used.

Specifically, fluorinated cationic surfactants such as the hydrochloride of the following can be exemplified.

In the present invention, the amphoteric or cationic fluorinated surfactant as described above is dissolved in a solvent at a low concentration.

The solvent is capable of dissolving the fluorinated surfactant,
In addition, it is important that the material is inert to the surface of recording and reproducing materials such as records.

The solvent is selected from organic solvents having a boiling point of 40 to 100°C, and volatile organic solvents having a boiling point of 60°C or lower are particularly suitable.

If the boiling point is too high, difficulties arise during coating-drying, etc., and if the boiling point is too low, disadvantages arise in terms of the product as a solution.

Although various examples of such solvents can be used, trichlorotrifluoroethane and lower alcohols are usually preferred.

In particular, trichlorotrifluoroethane is advantageous because it is nonflammable.

In the present invention, lower alcohols such as ethanol and impropatol may be used alone, but it is usually preferable to use them as a mixture with trichlorotrifluoroethane.

An amphoteric or cationic fluorinated surfactant is dissolved in the solvent at a concentration of 1% by weight or less.

If the concentration is too high, the uniform application of a thin layer onto the surface of the recording/reproducing material will be impaired, and it will also cause noise in records and the like.

Preferably, a concentration of about 0.01 to 0.5% by weight is employed.

Of course, the S concentration is the one adopted when applying the solution of the present invention, and it may be made to a high concentration during product storage or transportation, and then diluted when used.

Further, the solution of the present invention may be used as is or may be filled into a pressurized container with a suitable propellant to form an aerosol product.

The surface treatment agent of the present invention is prepared by adding a small amount of a specific multifluorinated organic compound to a solvent solution of the amphoteric or cationic fluorinated surfactant as described above.

The specific multifluorinated organic compound is selected to have a boiling point of 110° C. or higher, a melting point of 120° C. or lower, and a solubility in water of 0.5% or lower at room temperature.

As the multifluorinated organic compound, one with a fluorine content of 30% by weight or more, preferably 50% by weight or more is selected.

If the boiling point is too low, the sustainability of the addition effect will be impaired due to volatilization, and if the melting point is too high, the frictional force lowering effect will not be sufficiently exhibited.

Preferably, those having a boiling point of 150°C or higher are used.

Suitable examples of specific multifluorinated organic compounds include (however, n-1 to 22m-3 to 20.l-3 to 20.P
=1-30, q=1-3), etc.

Therefore, the concentration of the multifluorinated organic compound added is 1
% by weight or less may be employed.

If the concentration is too high, the uniform application of a thin layer onto the surface of the recording/reproducing material will be impaired, and it will also cause noise in records and the like.

Preferably, a concentration of about 0.01 to 0.5% by weight is employed.

As mentioned above, the concentration of S is also the one that is employed when applying the solution of the present invention.

The surface treatment agent of the present invention can be applied to vinyl records, video discs,
Although it can be widely applied to recording and reproducing materials such as magnetic disks, tapes, photographic films, and projection films, it is particularly suitable for use in record discs because of its advantageous effects.

Next, embodiments of the present invention will be explained in more detail.
It goes without saying that the present invention is not limited in any way by these explanations.

[F] *Krytox-143 manufactured by DuPont, USA, with a boiling point of 280°C and a melting point of -35°C.

After spraying a solution with the above composition onto a record and polishing it with a soft cloth, a thin and uniform surface on which the fluorinated surfactant and multifluorinated organic compound are adsorbed can be formed on the record. can.

In order to evaluate the antistatic performance, the surface of the vinyl acetate/vinyl chloride-10790 (weight ratio) copolymer was treated,
The results of measuring the surface electrical resistance are shown in Table 1 below.

Note that Table 1 also shows the untreated case (Comparative Example 1).

The measurement results of the dynamic friction coefficient are also shown in Table 1.

Next, in order to investigate the effect on sound quality and the sustainability of the effect, we treated the surface of the record and measured the distortion rate of the sound at a wavelength of 12.5 KHz after repeated playback from 1 to 40 times. The results shown in Table 2 were obtained.

Note that Table 2 also shows the results of Comparative Example 2, even when no multifluorinated organic compound is added to the solutions of Examples 1 and 2.
and 3.

Also shown is the untreated case (Comparative Example 1).

After spraying a solution with the above composition onto the record and polishing it with a soft cloth, a thin and uniform surface on which the fluorinated surfactant and multifluorinated organic compound are adsorbed is formed on the record. I can do it.

In order to evaluate the antistatic performance, the surface of the vinyl acetate/vinyl chloride-10790 (weight ratio) copolymer was treated,
Surface electrical resistance was measured.

We also measured the coefficient of dynamic friction.

These measurement results are summarized in Table 3 below.

Claims (1)

[Scope of Claims] 1. A cationic or amphoteric fluorinated surfactant having a perfluoroalkyl group having 4 to 20 carbon atoms dissolves the fluorinated surfactant and leaves an inactive surface on the surface of the recording/reproducing material. A composition that is dissolved in an organic solvent with a boiling point of 40 to 100°C at a concentration of 1% by weight or less, has a boiling point of 110°C or more, a melting point of 120°C or less, and has a solubility in water of 0 at room temperature. A surface treatment agent for recording and reproducing materials, characterized in that a polyfluorinated organic compound having a fluorine content of 30% by weight or more and a concentration of 1% by weight or less is added and mixed therein. 2. The processing agent according to claim 1, wherein the organic solvent is trichlorotrifluoroethane. 3. The processing agent according to claim 1, wherein the organic solvent is a lower alcohol. 4. The processing agent according to claim 1, wherein the organic solvent is a mixed solvent of trichlorotrifluoroethane and lower alcohol.