JPH04105215A - Magnetic recording medium - Google Patents

Abstract

PURPOSE:To suppress growing of mildew by incorporating at least one of 10,10'- oxybisphenoxyamine, 3-acetyl-6-methyl-2H-pyrane-2,4-(3H)dion, etc., as a mildew proofing agent into a magnetic layer or coating layer. CONSTITUTION:A magnetic layer 12 containing a lubricant is formed on a nonmagnetic supporting body 10, a coating layer 14 is formed if necessary on the nonmagnetic supporting body 10 or the magnetic layer surface to constitute the magnetic recording medium. Into this magnetic layer 12 or coating layer 14, at least one compd. selected from 10,10'-oxybisphenoxyamine, 3-acetyl-6- methyl-2H-pyrane-2,4-(3H)dion, etc., is incorporated as an antimold. This mildew proofing agent is added by proper method according to the forming method of the magnetic layer 12 or back coating layer. For example, the mildew proofing agent is mixed with the layer or applied thereon as a topcoat. Thereby, growing of mildew can be effectively suppressed even when a lubricant is used.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a magnetic recording medium that is treated with anti-mildew measures, and particularly relates to a magnetic recording medium that is suitable for anti-mildew when a lubricant is used to improve runnability.

[Prior Art 1] Magnetic Recording Medium 2 For example, a magnetic tape has a structure as schematically shown in FIG. In the figure, a magnetic material and a binder are provided on one side of a non-magnetic support 10 formed of a polyester film or the like. The magnetic layer 12 is formed by applying a magnetic paint in which a dispersant and a lubricant are dispersed and kneaded in an organic solvent. Further, on the other surface of the nonmagnetic support 10, a back coat layer 14 containing a nonmagnetic substance such as carbon in a binder is formed. Note that an undercoat layer may be formed between the nonmagnetic support 10 and the magnetic layer 12 in order to increase their adhesive strength. A top coat layer may be provided on the magnetic layer 12 for surface protection. Further, the back coat layer 14 is formed as necessary to improve tape runnability, tape winding condition, or prevent dropout. These non-magnetic supports 10. Magnetic layer 12. Various specific materials and manufacturing methods for forming the back coat layer 14 are disclosed in, for example, Japanese Patent Laid-Open No. 2-49217. A binder used in such magnetic recording media. In particular, it has been said that urethane is susceptible to mold growth, and techniques for suppressing the growth of mold have been proposed in Japanese Patent Application Laid-open Nos. 81-214212 and 61-61.
No. 71414, JP-A-63-39159, JP-A-2-
It is disclosed in Japanese Patent No. 49217. Among these, JP-A-61-214212 or JP-A-61-71414 contains an antifungal agent such as 2-(4-thiazolyl)benzimidazole in the magnetic layer 12 or back coat layer 14. A magnetic recording medium is disclosed. Further, Japanese Patent No. 63-39159 discloses an information recording medium in which the vapor of a volatile antifungal agent is brought into contact with the recording layer side of the medium. Further, JP-A-2-49217 discloses a magnetic recording medium in which a fungicide such as p-) lyljode methyl sulfone is retained in the magnetic layer 12 or the back coat layer 14. [Problems to be Solved by the Invention] In recent years, as the performance of magnetic recording media has improved, various lubricants have been used to improve the running properties of magnetic recording media. As the lubricant, for example, fatty acids, fatty acid esters, etc. are used. When we investigated such cases, it became clear that the lubricant acts as a nutrient source and promotes the growth of mold. However, in the above-mentioned conventional technology, no special consideration is given to the use of such a lubricant, and therefore a sufficient antifungal effect cannot be expected. The present invention has been made in view of these points, and an object of the present invention is to provide a magnetic recording medium that can effectively suppress the growth of mold even when a lubricant is used. .

[Means to solve the problem]

The present invention provides a magnetic recording medium in which a magnetic layer containing a lubricant is formed on a non-magnetic support, and a coat layer is formed as necessary on the surface of the non-magnetic support or the magnetic layer.
10.1 The magnetic layer or coating layer may be used as a fungicidal agent.
0'-oxybisphenoxyamine, 3-acetyl-
6-methyl-2H-pyran-2,4-(3H)dione,
Cyanomethylthiobenzothiazole, propionic acid, tetrachloroisophthalonitrile, 4-chlorophenyl-
31-Iodopropargyl formal, short methyl-
P-) Risulfone, pentachlorophenyl laurate, 2-(carbomethoxyamino)-benzimidazole, 2-(4-thiocyanomethylthio)benzothiazole, sodium 2-mercaptobenzothiazole, dodecylguanidine hydrochloride, sodium-2-pyridine Thiol-1-oxide, 3,5-dimethyl-tetrahydro-
It is characterized by containing at least one type of 2H-1,3,5-thiadiazine-2-thione. As for the method of adding these antifungal agents, the most convenient method corresponding to the method of forming the magnetic layer or back coat layer may be selected, and either internal addition or top coating may be used. For example, when adding an antifungal agent internally, the amount of antifungal agent is 0.05 to 1 part by weight per 100 parts by weight of the binder.
The amount is 0.00 parts by weight, preferably 0.1 to 3.0 parts by weight. The magnetic material, binder, dispersant, and lubricant used here are those disclosed in the above publication. All commonly used ones can be used, including those mentioned above, and are not limited to the examples described below.

【Example】

Examples of the magnetic recording medium according to the present invention will be described below. This example is an example in which an antifungal agent is added to the magnetic layer 12 of a magnetic recording medium having the structure shown in FIG. The magnetic layer 12 is formed on one surface of the nonmagnetic support 10 by applying magnetic paint. The magnetic paints used at this time include those shown in Table 1 below. Table 1 Note that among the above materials, co~γ-Fe203 is a magnetic material, vinyl chloride and urethane are binders, carbon black is an antistatic agent, Cr2Q3 is an abrasive, fatty acids and fatty acid esters are lubricants, toluene and methyl ethyl ketone are solvents. Magnetic paints were prepared by adding 14 types of fungicides shown in Table 2 at various concentrations to the paint compositions having such compositions. Furthermore, this was coated on a non-magnetic support 10 to prepare a sample of a magnetic recording medium. (Left below) Table 2 The results are shown in Table 3 below. (Left below) Next, for each of these samples, JIS Z2911-1
The antifungal effect was tested using the fungal resistance test method specified in 981. Table 3 In addition, in this Table 3, N o of the antifungal agent. The correspondence between and materials is as shown in Table 2 above. Furthermore, in Table 3, the amount of the antifungal agent is expressed as a percentage (phr) relative to 100 parts by weight of the binder. In addition, as shown in the bottom row of Table 3, the evaluation value and degree of mold growth are shown below as a comparative example for the case of only the coating composition in Table 1, that is, no antifungal agent is included. A similar test was also conducted in a case that was otherwise exactly the same as in the example. As is clear from the above results, compared to the sample of the comparative example which does not contain a mold preventive agent, the sample containing the mold preventive agent in Table 2 according to this example is better when a lubricant is used. It can be seen that it also has a good anti-mold effect. For example, when comparing the state of mold growth after the fourth week, in the comparative example, mold has grown in 70% or more of the parts with a rating of "1". On the other hand, in the sample according to this example, even the lowest evaluation was "3", and the mold growth was 30.
% or less. Furthermore, in all samples, the growth of mold was successfully reduced by increasing the concentration of the anti-mold agent. In particular, 3-acetyl-6-methyl-2H-pyran-2,4-(3H) dione No. 002, No.
The product using cyanomethylthiobenzothiazole (No. 3) was evaluated as ``5'' in the fourth week, which means that no mold growth was observed, and it was extremely effective even when the concentration was low. It was done. Note that the present invention is not limited to the above embodiments in any way. For example, the above-mentioned fungicide may be added to the back coat layer or tomp coat layer of the magnetic recording medium, or may be added to two or more layers. Further, the antifungal agent to be added is not necessarily limited to one type, but a combination of two or more types may be used. Furthermore, various types of magnetic recording media can be used, such as magnetic tapes and magnetic disks. [Effects of the Invention] As explained above, according to the magnetic recording medium of the present invention, even when a lubricant is used, mold growth is effectively suppressed, and the magnetic recording medium is highly reliable. It has the effect of being able to provide

[Brief explanation of drawings]

FIG. 1 is a general configuration diagram of a magnetic recording medium according to the present invention. 10... Nonmagnetic support, 12... Magnetic layer, 14...
・Back coat layer. Patent applicant: Victor Japan Co., Ltd.

Claims (1)

[Scope of Claims] A magnetic recording medium in which a magnetic layer containing a lubricant is formed on a non-magnetic support, and a coat layer is formed as necessary on the surface of the non-magnetic support or the magnetic layer, comprising: The magnetic layer or coating layer contains 10,1 as an antifungal agent.
0'-oxybisphenoxyamine, 3-acetyl-6
-Methyl-2H-pyran-2,4-(3H)dione, cyanomethylthiobenzothiazole, propionic acid, tetrachloroisophthalonitrile, 4-chlorophenyl-3
'-iodopropargyl formal, diiodomethyl-P
- trisulfone, pentachlorophenyl laurate,
2-(carbomethoxyamino)-benzimidazole,
2-(4-thiocyanomethylthio)benzothiazole,
Sodium 2-mercaptobenzothiazole, dodecylguanidine hydrochloride, sodium 2-pyridinethiol
1-oxide, 3,5-dimethyl-tetrahydro-2
A magnetic recording medium comprising at least one type of H-1,3,5-thiadiazine-2-thione.