JPS58175134A - Magnetic recording medium - Google Patents

Abstract

PURPOSE:To provide high wear resistance and shelf stability and to obtain high reproduction output, by adding a specified compound to a magnetic recording layer. CONSTITUTION:To a magnetic recording layer on the surface of a support is added a compound represented by formula I , wherein R1 is >=8C alkyl, >=8C alkenyl or F substituted alkyl, Z is (CH2)n (n is 2, 3 or 4), M is H or an alkali metallic atom, and R2 is H, an alkali metallic atom, alkyl, alkenyl, aryl or F substituted alkyl. The compound is concretely represented by formula II.

Description

[Detailed description of the invention]

The present invention relates to magnetic recording media such as magnetic tapes and magnetic sheets, and in particular has good wear resistance and storage stability.
The present invention relates to a high-quality wrinkled magnetic recording medium with high reproduction performance. Conventionally, in magnetic recording media such as recording tapes and video tapes, magnetic grade powders such as Fe2O2 and Fe-Co-Ni alloys have been used to replace magnetic grade powders such as Fe2O2 and Fe-Co-Ni alloys with vinyl chloride-vinyl acetate copolymers and vinyl chloride-7nylidene chloride copolymers. Combined, butyl acrylate, zoteracrylic acid-acrylonitrile copolymer, cellulose resin, polyoxy resin, pyriurethane resin, etc. are dispersed and kneaded into @can liquid #F
The film was coated on a non-magnetic supporting rod surface in the form of a film made of +1 ethylene terephthalate, cellulose triacetate, precarginate, teripropylene, polyvinyl chloride, or the like. By using one of these binders alone or in combination, the MU property between the particle surface of the a-characteristic powder and the binder is smoothed, and the shape of the magnetic fine powder particles is acicular. The dispersibility of magnetic fine powder from the bonito rock that Fune Crystal Co. owns during crystallization tends to be poor, and therefore, in conventional magnetic recording media, it is difficult to obtain the desired magnetic properties. However, the properties required for magnetic recording media, such as abrasion resistance and storage stability, were not fully satisfied. Special! ! In videotapes recorded in the 51st wavelength period, problems occur due to poor dispersion of magnetic powder in the magnetic layer, deterioration of the S/N ratio, and I! & degree drop

[Inviting and force-oriented media come into contact with the magnetic head violently during recording and reproduction, so repeated use causes magnetic l! As soon as the smell was worn out and the magnetic powder contained in the smear was removed, the magnetic head was clogged and other undesirable results were caused. For this reason, it is difficult to control the particle size distribution of magnetic fine powder and improve the dispersibility of magnetic forging powder during the Song Dynasty, and various additions are needed to improve wear resistance. I have 1 used one. Tomo Toe is special public Sho 4l-18 (No. 164, Sho 43-186 Aoi, U
No. 43-669, 1ro 147-15624-jl, %N
Showa 49-53402%, Showa 49-58804, Showa 49
-844i15 Aoi, 1ffJ No. 51-413904,
As described in each publication of No. 52-70813, higher fatty acids, fatty acid amides, fatty acid esters, lower alcohols, metal soap, 7I#lR, Containing alcohol sulfate ester, pyriethylene odPfide, and lecithin at, one layer is placed on the magnetic support surface in this magnetic powder dispersion paint,
Magnetic recording media are manufactured. However, even with the addition of these additives, it is possible to obtain a magnetic recording medium with desirable homogeneity in terms of magnetic properties, abrasion resistance, and long-term storage stability. It was particularly difficult. That is, for example, if a large amount of these #i additives is used, the mechanical stiffness of the magnetic recording layer deteriorates, which is an undesirable result. However, after the magnetic recording layer is formed, the additive gradually oozes out onto the surface of the magnetic recording layer due to the accumulation of additives over time, resulting in the so-called luminda phenomenon, which causes stickiness, etc. This gives unfavorable results in terms of storage stability. father,! @Magnetic fine powder dispersibility,
The magnetic properties of the magnetic recording layer were by no means satisfactory. SUMMARY OF THE INVENTION It is an object of the present invention to overcome the various drawbacks of the magnetic recording medium 1r and provide a more precise magnetic recording medium 1r. Another object of the present invention is to provide a recording medium W having excellent abrasion resistance. Another object of the present invention is to provide a magnetic recording medium with good S/Ntt. Another object of the present invention is to provide a magnetic recording medium with a strong odor reproduction output.A further object of the present invention is to provide a high-quality magnetic recording medium with excellent storage stability. . For the purposes of the invention, the inclusion of a compound represented by the following general formula [1] in the air recording layer on the surface of the support (hereinafter referred to as the compound of the present invention) is considered to be t-%. This is accomplished by a magnetic d1 recording medium. General formula [I] N-Cf (2COOM In the general formula [1,1, R1 has 8 or more carbon atoms, preferably "!t, <U8-20 alkyl group (e.g. octyl group, dodecyl group, octadecyl group), 8 or more carbon atoms,
It preferably represents an alkenyl group having 8 to 20 carbon atoms (e.g., dodecenyl group, oleyl group) or a fluorine atom-substituted alkyl group having 2 or more carbon atoms, preferably 2 to 2 carbon atoms, preferably 2 to 2 carbon atoms, and Z is +CH2+o [however, n represents 2, 3 or 4], M represents a hydrogen atom or an alkali metal atom (e.g. potassium L atom, nat + J2 L atoms), R2 represents a hydrogen atom, an alkali metal atom (e.g. potassium L atom, na)
+4 J- atoms), alkyl groups, preferably alkyl groups having 1 to 20 carbon atoms (e.g. methyl, ethyl, octyl, tenyl, dodecyl), alkenyl groups (e.g. propenyl, octenyl) , oleyl group), AI
It represents a J- group (for example, dodecylphenyl group) or a fluorine atom-substituted alkyl group, preferably a fluorine atom-substituted alkyl group having 2 to 2 carbon atoms. Next, what are some specific examples of uninvented compounds? However, the compounds of the present invention are not limited thereto. [Exemplary compounds. [Product] N-CH2,COOH N-CH2C0OH N-CH2C0OH Synthesis examples of compounds of the present invention are listed below. 1. Synthesis example of exemplified adduct (1) diethylenetriaminepentaacetic acid (DTPA) dianhydride (DTP) with a yield of 92% and a melting point of 168-169°C
A dianhydride casing, a dense stirring device, a dropping funnel, a reflux tube with a drying tube, and a water content meter were attached to a 5 (10-)
PA dianhydride (), 1 mol and dry dimethylpol 1. Amide (DMF) 240m7! After heating and dissolving, 80 g of a dry DMF solution containing 0.1 mol of long-chain alcohol was added dropwise over 1 hour, followed by further stirring at 85° C. for 8 hours. Add 10 cc of water to this reaction solution, stir at 65°C for 30 minutes,
The remaining DTPA anhydride ring total water ring total ring-opening reaction solution was dried under reduced pressure,
After removing insoluble materials in hot ethanol and hot cyclohexane, the mixtures were recrystallized from ethanol. Melting point 113 ~ at 5% yield
The target product was obtained at 115°C. 2. @bottom side of Exemplified Compound (4) 1. A similar reaction was carried out, and the reaction solution was diluted to 1/3
Crystals K precipitated when concentrated under reduced pressure in Step 1 and cooled to 25°C
W was removed and recrystallized from DMF:methanol (2:1). After heating and dissolving this in DMF again, 20 g of water was added at 85° C. to completely open the ring of the remaining DTPA anhydride. When this reaction solution was cooled to 70'C, it precipitated.
The filtrate was evaporated to dryness and recrystallized from water-DMF'. The desired product was obtained with a yield of 17% and a melting point of 121-154°C. 3 Synthesis example of exemplified compound (5) 1. above. Perform the same operation as above and add 0.2 mol of long chain alcohol. The desired product was obtained as a white powder insoluble in hot ethanol. The yield was 75%. In addition to the above, there are also uninvented compounds in oil chemistry. Volume 31, page 47 (1982), Volume 19, □No. 9
It can be easily synthesized according to the description on page 84 (1970). Two or more of these non-exploitable compounds may be used in combination. The six fine powders used in the following margin are fine powders whose major axis is 0.1p to ]p, but the magnetic metal powder is 9t! Metals such as iron, nickel, and iron,
Aluminum, steel, lead, magnesium,
Alloys of metals and mixtures thereof, such as nickel, tin, lead, antimony, bismuth, cadmium, calcila, manganese, selenium, titanium, tungsten, aluminum oxide, iron oxide, Examples include steel, metal compounds containing gold layer oxides such as lead oxide, nickel oxide, titanium oxide and magnesia oxide, and ferromagnetic materials such as ferrite.
A fine powder of ferromagnetic metal such as ferromagnetic metal is used. at least 1
4 is dissolved in a solvent such as toluene, methyl ether ketone, ethyl cellosolve, acetone, methanol, etc., and the magnetic fine powder is immersed in the solution at a suitable ratio, wetted with light, and then stirred and mixed. The powder is surface modified resulting in a treated magnetic powder that can be easily wet-dispersed in Ik-based solvents and binders. or a at least 1 of the compounds of the present invention.
The powder may be added to the magnetic powder-dispersed paint in contact with the IL or dissolved in a suitable solvent. The compound of the present invention is usually added at 0.0% per part of a-type powder.
5den parts 1-3. It is desirable to use a range of ρ, preferably 5 to 10 parts. If the amount of the compound of the present invention is less than 0.5 parts by weight, the effect of this @ light will not be significant, and if it exceeds 30%, blooming tax effects may occur, which may give undesirable results. . In general, magnetic powder dispersion paints contain ferromagnetic powder, yi# compound, the chemical compound of the present invention, and a simple solvent as main components, and in addition, the necessary *[
Contains dispersed copper, internal abrasives, abrasives, and anti-cutting agents according to the requirements. In this process, the non-magnetic support is prepared by dissolving and dispersing the treated powder in the above-mentioned solvent VC. The method for manufacturing the magnetic powder fraction paint used in the present invention is described in Japanese Patent Publication No. 35-15, No. 39-26794, 15+43.
-'186, No. 47-28043, (b) 47-2
No. 8045, No. 47-28 (No. 146, No. 47-28
No. 048, No. 47-31445, 111148-11
No. 162, l'l'14 B-21331, approximately 4.8
-33683, USSR Patent Specification No. 3o 8033
It is described in detail in each publication such as No. The conventionally known fP5 can be used for the present invention.
1! ll resins, thermosetting resins, reactive resins, and mixtures thereof are used. Heat 5JIi! For l-type resins, the softening temperature is 150°C or less and the average molecular weight is 111,11110 to 200,000.
．． Polymerization control - 6g approx. 2110~2. (1(+(lKamsaka's), such as vinyl chloride-vinyl acetate copolymer, vinyl chloride-vinylidene chloride coelectrolyte, vinyl chloride-acrylonitrile coelectrolyte, acrylic acid ester-acrylonitrile copolymer *@ body, Acrylic ester-vinyritine chloride copolymer, acrylic ester-styrene copolymer, memethacrylic ester-acrylonitrile copolymer, methacrylic ester-vinyritine 111 copolymer, methacrylic ester-styrene copolymer , urethane elastomer, vinyl pyrofluoride, vinylidene chloride-acrylonitrile co/Togopolymer, acrylonitrile loop-tagene copolymer, I-lyamide misozo, ?rivinylzoteral,
Cellulose derivatives (cellulose acetate phthylate,
Cellulose diacetate, cellulose triacetate f-)
, cellulose propio i-), nitrocellulose),
Styrene-butadiene copolymer, pyriemthyl*TIk
, xeronyl ether-7-11 acid ester copolymer, amine a&, resin resin and mixtures thereof are conveniently used to control the heat of the yarn. To these resins, Tokuko Sho 37-6877 Gei, Sho 39-1
2528-SiI, m139-19282, same 40-
No. 5349, 4 (+ -211907 Ko, 1 J1
No. 41-9463, I? ! No. 141-14059, 1r
fl No. 41-16985, Cod No. 142-6428, No. 42-11621, No. 43-4623, No. 443-1
52o6*, No. 44-2889, No. 44-17947
No. 44-182: (No. 2, No. 45-14 (No. 120, Mukai 45-1451) No. 0, 1W147-18573-
j! , No. 47-22063, No. 47-22064,
No. 47-22068, No. 47-22069, No. 47
-22070, No. 48-27886, US Patent tJJ3. i No. 44,352, No. 3,419,4
No. 20, No. 3,499,789, No. 371388
7. It is stated in the specifications. In addition, as a reactive resin, the molecular weight of the coating liquid is less than f1200.0 (101), and when the coating is dried, it becomes a polymer due to warpage due to condensation, addition, etc., and has an infinite molecular weight of 11. In addition, among these thermosetting resins and molding resins, it is preferable to use one that does not soften or become 1W IIs before the resin becomes a polymer.
Specifically, 6 examples are phenol gradual, engineering resin, -
f urethane curing resin, urea resin, melamine resin,
Alkyd resin, silicone resin, acrylic thread reaction resin,
Mixture of day molecular weight pyriester resin and yinyanate full I remer, mixture of methacrylate coelectrolyte and diyinyanate pre-CJ mer, mixture of pyriester pyryester resin and pyriincyanate, urea forearaldehyde resin , a mixture of low molecular weight glycol/black molecular weight diol/triphenylmethane triynnanate, ? Liamino 4!
These include FJ fat and mixtures thereof. To these resins, Special Publication No. 339-81
No. 40-9779, No. F5141-7192, No. 41-
No. 8016, No. 41-14275, No. 42-1817
No. 9, fit 43-121) No. 31, ti'r14
4-28023, 45-14501, 1ry14
5-2490244, 446-13zJ3, 47-
No. 22067, I'rT147-22 (No. 172, direction 4
7-22 (+7:l:, 47-28 (No. 145, rr
r+ 47-28 (No. 148, No. 47-28922, U.S. Patent No. 3,144,353, m3,
32 (1, (1911, (y) No. 3,437,51
No. 0, UJR No. 3,597,273, UJR No. 3,781,
No. 210 and No. 3,781,211. These concatenation sequences may be used alone or in combination, and others may be added as needed. In the mixing ratio of ferromagnetic fine powder and range N cutting, ferromagnetic fine powder I
II O electric power f! 1 to 1 (1 to 40
0 parts by weight, preferably in the range of 30 to 2 (10 parts by weight). If there is too much cutting, the recording and density will decrease when used as a magnetic recording medium, and if it is too little, the magnetic recording layer will deteriorate. The magnetic powder molecules and paint that form the magnetic recording layer have a
In addition to the compound of the present invention, the binder, and the ferromagnetic fine powder, a dispersant, a direct eraser, an abrasive, an antistatic agent, and the like may be added as additives. Examples of dispersants that may be used include caprylic acid, caffeic acid, lauric acid, myristic acid, ζlumitic acid, stearic acid, oleic acid, elaidin ugly, linoleic acid, and linoleic acid, which has 12 carbon atoms. ~18 fatty acids (IIJ C0OH, R sea urchin alkyl group having 11 to 17 carbon atoms): l! Alkali metals of fatty acids in Section III (
Li, Na, etc.) and alkaline earth gold A (Mg
, Ca, 8a%): Lenten soap is used. In addition to these, charcoal, alcohols having a number of atoms of 12 or more, and other kilic acid esters are also suitable for use. These dispersants are added in an amount of 1 to 20 parts per 100 parts of the binder M4. To these fractions M, Japanese Patent Publications No. 39-28369 and No. 44
-17945, No. 48-150 (11 Yongyong Publication, U.S. Patent No. 3,587,993, March, No. 3,470.1)
21. It is stated in the specifications of the product and the like. As Junyuji, silicone oil, Kazen Black Graft Pillimer, graphite, Kazen Black Graft Pillimer,
Molybdenum disulfide, tungsten disulfide, 1 carbon atom
Fatty acid ester (so-called wax) consisting of 2 to 16 monobasic & fatty acids and a monohydric alcohol having a carbon number of 21 to 23161 in total with the number of carbon atoms of the fatty aO #! It can also be used for convenience. @1111I Tsugu ni Yui 9 Ni Tsugu 1
(For 1 part of 10 oboro, paint is applied in the range of 0.2 to 213 parts by weight. Regarding these, Japanese Patent Publication No. 43-23889, Japanese Patent Publication No. 43-81543, etc., U.S. Patent No. 3
, No. 470,021, No. 3,492,235, No. j
I3,497,411 pregnancy, same No.3,523. (No. 186, No. 3,625,761), No. 3,630,77
No. 2, No. 3,634,253, No. 3,642,5
Specifications of No. 39 and No. 3,687,725, I
BM Technical DisclosureB
ulletin Vol, 9, m7, Pa
ge 779 (December 1966): El, EKT
RONIK 1961 N1112゜Page 38
0 etc. The abrasives used are commonly used materials such as fused alumina, silicon carbide oxide chrome, corundum, artificial corundum, diamond, artificial diamond,
Garnet, comely (main ingredients: corundum and magnetite), etc. are used. These abrasive S materials have an average particle size (,1,0
Use awns that are 5 to 5p in size, I? ! FVc is preferably tl, 1 to 2μ. To these polishing examples, 415F was added to these polishing materials in the range of 7 to 2 (1 part) to 1 (1 part).
-115510, U.S. Patent No. 3.1) 07.8
07 No. 3,041,196, No. 3,
687,725 Fang Yong Kai 4, English Patent No. 1,145.
No. 349, West German Patent (DT-PS) 853.
It is described in the specification of No. 211. Conductive powders such as graphite, cardan/lac, cardan-graft delimer, etc. as antistatic steel; natural surfactants such as zapinine: alkylene oxide series, G-IJ serine thread, G-17 Sidol thread. Nonionic surfactants such as Ac! Alkylamines, quaternary ammonium salts, pyridine, and other complex Jj1
Kind, Phosphonyl! Cationic surfactant series such as sulfonyl groups: η-based anionic surfactants containing acidic groups such as sulfonic acid, phosphoric acid, sulfuric acid ester groups, and phosphoric ester groups; amino*a, aminosulfonic acids, amines Internal active agents such as alcohol sulfur & or phosphate esters are smeared with stool. U.S. Patent No. 2,271,623 and U.S. Patent No. 2,240.47 on the use of these antistatic steels and the active rkl series.
No. 2, No. 2,288,226-j! , No. 2,676
, No. 122, No. 2,676,924, TS2,6
No. 76.975, No. 2,691.566, No. 2,
727,860; No. 3,201,253, No. 3.21 (1,191
No. 3,294,540, No. 3. ,415,6
49, ri51 No. 3,441,413, ri No. 3,4
No. 42,654, fi! No. 3,475,174 and No. 3,545,974, West German Patent Publication (
OLS ) 1,942,665 Ao Specification, British Patent No. 1
．． (177, No. 3-17, No. 1.198.450 of Cicada), Ryohei Oda et al., “Surfactant @
"Interscience and its Applications" (Maki Shoten 1964 edition);
958 l17R):T. Written by P. Sisley [Encyclopedia R.F.A. It is described in vol. 2 J (Chemical Nomi Solitshu Kanno Z Ni 1964, 71); "Surfactant Handbook" No. 61 IS (Sanpan Tosho Co., Ltd., December 20, 1966), etc. These surfactants can be added alone or in a mixture. Although it is used as an antistatic steel, it may also be used for other purposes depending on the evening scenery, for example, as a fraction, improving magnetic properties, improving wetability, and coating properties. The magnetic recording layer is formed by dissolving in a solvent with the above composition,
Spread it on the surface of a non-magnetic support as a coating solution. Organic solvents used during coating include acetone, methyl enal ketone, methyl inodutyl ketone, cyclohexanone type ketones: methanol, ethanol, floor! Nol, alcohol thread of citanor; methyl acetate,
Ether acetate, a/tyl acetate, ethyl lactate, vinegar & 17-col monoethyl ether ginnoes f yarn; Tar M (aromatic M hydrocarbons; such as methylene chloride, ethylene chloride, carbon tetrachloride, chloroform, ethylene chlorohydrin, cyclolinzene, etc.) - logenated hydrocarbons, such as in-ton,) luene, and quince can be used. The material for the support may be any non-magnetic material, such as pyriesters such as polyethylene terephthalate, polyethylene 2,6-naphthalate, etc. Refins such as lipropylene, cellulose derivatives such as cellulose triacetate and cellulose diacetate,
Plastics such as Licarbonate, Cu* AZ
Non-magnetic metals such as Zn, ceramics such as glass, porcelain, and earthenware are used.The thickness of these non-magnetic supports is about 3 to 1 (thick) μm per sheet. Cheng-same, preferably 5-5 (lj
llrn, and 0.5 in the case of discs and cards.
It is approximately 10111II and has a drum-like cylindrical shape, and its star is determined depending on the recorder used. The above-mentioned non-magnetic support may be coated with a so-called backcoat of ilI, which is opposite to the general surface on which the magnetic layer is provided, for the purpose of preventing static electricity, preventing transfer, and the like. Regarding the /Gutsuku coat, for example, U.S. Patent No. 2.804.4111 Hem, Column 1, U.S. Patent No. 3,293. (166 Homare, No. 3.617.37 s, $3,062,67
6-IiiiF, (b) No. 3.734,772, (b)
No. 3,476,596, same No. 2.643. (No. 148, Mukai @ 2,8 (13,556, same No. 2.887, 4)
No. 62, No. 2,923,642, lff1 No. 2.9
97.4514 Shibu 11 Same No. 3. () I17, 89
2-i, b 5J No. 3.041, 196-1t=t,
rfFla43,115.420-H1ThlA. 3.166,68 a-@ is described in each specification of et al. Further, the support material may be a tape, a sheet, a card, a disk, a dowel, etc., and various materials may be selected depending on the form and necessity. Magnetic fine powder and the above-mentioned sweetfish monitoring, dividing enemy exchange, Japanese steel cutting, before polishing, emperor! Prevention, the solvent is kneaded into magnetic powder fraction I! l
It is considered a fee. For the cross-wire RC, the magnetic fine powder and each of the above-mentioned components are all fed into the cross-wire machine at the same time or all at the same time. For example, there is a method in which a fine magnetic powder is added to a solution containing 1 minute aqueous powder and kneaded for a certain period of time, and then the remaining components are added and mixed continuously to obtain a magnetic powder aqueous material. Various types of crosstalk machines are used for crosstalk. f
llλ is two roll mill, three roll mill, mail mill, if mill, sand grinder, Szegvir
i attritor, high speed iniler fractional machine, high speed stone mill, bad attitude guard mill, buisu Iri-12-der, ? f4
These include 3-way mixer mixer, ultrasonic fractionator, etc. Techniques related to crosstalk fraction include T, C', PATTON
IIFaint Flow and Pigment
Dispersion (1964 John Wil
(Published by Lay & Song). Also, U.S. Patent No. 2,581,414, U.S. Pat.
It is also mentioned in each specification of Nos. 5-6. The predetermined coating method for distributing the magnetic powder on a non-magnetic support to form a magnetic recording shadow is air).
Lid coat, Fred coat, Air knife coat,
Squeeze coat, impregnated coat 13/e-roll coat, transfer roll coat, clavia coat, medium scoat, cast coat, spray coat, etc. can be used, and other methods are also possible. "Coating Engineering" 253-277
(published on March 20, 1971), it is placed in Kizuna M. By such a method, the magnetically distributed layer is coated on the p-support during the application of the magnetic dispersion cage material. After application, the formed magnetic recording layer is dried. In addition, a magnetic recording medium according to the invention is manufactured by subjecting the material to T-weaving and cutting it into a desired shape. In this case, the orientation magnetic field is approximately 500~2,
000 gauss, about 50-100 at dry temperature
The drying time varies from about 3 to 10 minutes. The orientation method of magnetic fine powder is also described in the following patent publications and specifications. For example, U.S. Pat.
No. 949, No. 3゜473.960, No. 3,681
．． Specifications of No. 138, Japanese Patent Publication No. 32-3427, No. 3
9-283684jjr, Town 40-23624, Town 4
No. 0-23625, No. 41-13181, No. 4B-1
These publications include No. 3043 and No. 48-39722. The direction in which the magnetic material is oriented depends on its intended use. Namely % Planned tape, small! 11 In the case of video tapes and memory tapes, it is oriented parallel to the length direction of the tape, and in the case of broadcast video tapes, it is oriented with an inclination of 3()O to 9(+') with respect to the length direction. The magnetic recording medium using the compound of the present invention has wear resistance,
It is a high-quality semi-regular recording medium with good storage stability and a reproduction output with a low S/N ratio. Below is the present invention t-lol @ as an example! This will be explained in detail. The ingredients, proportions, and order of operations shown herein may be modified as appropriate, and the present invention is not limited to the following examples. In addition, in the following examples, all "IsJ" indicates "Summer amount part". Real mesh example 1 Exemplary compound 11 shown in the t/g1 table below; - Exemplary compound (5) was diluted with 5 ()0 parts of methanol, and magnetic fine powder 1
Add 00 copies and forgive the mixed portion. That ilF treats me. After natural drying, dry under reduced pressure at 80°C, [41f! The treated magnetic powders a, 1 to 5 shown in Figures 1 and 5 were prepared and eaten. Above treated magnetic powder N! Collect a small amount of each of 11 to 5,
When a 72 thread swing test was carried out with water-toluene thread, the treated magnetic powder completely transferred to the organic powder. The fact that the untreated magnetic powder remains in the water layer indicates that the surface of the magnetic powder has been modified by the treated magnetic powder so that it can be well wetted during the tying of the organic solvent yarn. Understood. Using the treated magnetic powders 1 to 5 obtained above, a magnetic tape was prepared with the following composition. The above composition was placed in a T-gal mill and sufficiently mixed and dispersed to obtain a blackish brown magnetic powder M paint. 15μ of this paint
A piece of pyriethylene tele-7 tallate film fo [12
It was dried every II so that oo became dry while applying a magnetic field of 6t1. Each of the wide magnetic wafers thus obtained was subjected to a smooth calendering process and slit to a width of 12.7 cm to obtain a videotape. Then, the above-mentioned treated magnetic powder level 1~Nl
All of the 7'' cheeses produced using the 15-day test were referred to as inventive samples PIL1 to PIL-5. 1 Part Weaving Example 2) Exemplary Compounds (11 to Exemplary Compounds (5)) Shown in Table 2
was diluted with 500 parts of methanol, and a magnetic alloy (Fe-Co
-100 parts of N1) were added and mixed and dispersed. Thereafter, it was filtered, air-dried, and then dried under reduced pressure to produce treated magnetic powders N11L6 to 1O shown in Table 2. Using 6 to 10 tons of the thus obtained treated magnetic powder, a magnetic powder-dispersed paint was prepared with the following composition. 60 parts of toluene\5 parts of cyclohexanone The above composition was placed in a mail mill and thoroughly mixed and dispersed. 3 parts of tolylene diylananate was added and mixed uniformly to obtain a magnetic powder-dispersed paint. A piece of polyethylene terephthalate film 11[+ of this Il material t15a was spread and dried while applying a magnetic field of 120 (3 Gauss) so that the dry ring thickness was 5a.In this way, each sample of the hot water pressure width was Actual example 3 The above composition was put into a mail mill and thoroughly mixed and dispersed. After that, a blackish brown magnetic powder dispersion paint was obtained.Using this paint, a videotape 1 was prepared in the same manner as Sample 1 of the Actual Film.This tape is referred to as Invention Sample 11.Comparative Example 1 Surface Modification Actually 0 processed processing @ gender powder power / comparatively unprocessed jl
A deodotape was prepared in the same manner as in the actual trial of the present invention except that co-containing Fe3O4 was used. This is designated as comparative sample Nal. Comparative Example 2 Untreated magnetic alloy (Fs-CO-N1) was used on the surface of the treated magnetic powder after surface modification treatment. A videotape was produced.This is referred to as Comparative Sample 2. Comparative Example 3 The above composition was thoroughly mixed and dispersed in t-d-lumil to obtain a blackish brown magnetic powder dispersion paint.Using this paint, A videotape was obtained by summarizing it in the same manner as Practical Example 20 Invention Sample N16.This tape is referred to as Nippon II station charge 1113. Comparison 4 The above composition was thoroughly mixed and dispersed in a T-mail mill, and then magnetically Powder dispersion paint 1-*. Using this material, present invention sample N11 of fruit allif12
A videotape was obtained in the same manner as in g. Table 3 summarizes the comparative test results for each of these samples, including the tape comparison sample group 4. (hereinafter referred to as Ato pressure body) VOR for RF specific output measurement [Using 4M
The ORF output tm was determined in Hz and expressed as a relative value with the comparative sample Mal (2) output being 0. (b) Abrasion resistance was determined by repeatedly sliding a 5 m long piece back and forth at a speed of 7 m 1 sec using a mock head.
After that, the quality was determined visually and using a microscope. (e) Storage stability: Humidity: 804$RH%Tojaku: 40
Judgment was made based on the occurrence of sticking after being left for 24 hours at ℃. From the above results, it can be seen that the magnetic recording medium according to the present invention has better wear resistance and storage stability than conventional ones.
It can be seen that this is a high-density magnetic recording medium having a reproduction output of N ratio. Patent issuer: Konishiroku Photo Industry Co., Ltd. Agent Patent attorney: Nobuaki Sakaguchi (1 person in line)

Claims (1)

[Scope of Claims] A magnetic recording medium characterized in that a magnetic recording layer on a support surface contains a compound represented by the following general formula [T]. General formula CI), N -CHz C00M [wherein R1 is an alkyl group or alkenyl group having 8 or more carbon atoms, or an alkyl group substituted with a fluorine atom, ZU+CFI2+n (however, n is 2, 3 or 4 ), M is a hydrogen atom or an alkali metal atom, R2 is a hydrogen atom, a Plucari metal atom, an alkyl group,
Represents an alkenyl group, an aryl group, or a fluorine atom-substituted alkyl group. ]