JPS60109075A - Magnetic recording medium - Google Patents

Abstract

PURPOSE:To obtain a disk superior in abrasion resistance and wear resistance by inserting a magnetic disk body into a plastic case which has nonwoven fabric containing perfluoroalkyl polyether stuck on the internal surface in contact with the nonwoven fabric, and rotating the disk body. CONSTITUTION:The nonwoven fabric 5 such as rayon and polypropylene containing a 1,000-50,000mol.wt. lubricant of a compound expressed by a formula (where Rf is a inert fluoridation group and (m) and (n) are the numbers of such repetitive units that the molecular weight of the compound is 1,000-50,000) is stuck on the internal surface of the plastic case 6. The magnetic disk 4 formed by forming laminated magnetic recording layers of, for example, F-Ni layer 2 and a Co-Cr layer 3 on both surfaces of a nonmagnetic base 1 is inserted into this case and rotated in contact with the nonwoven fabric 5 of the disk 4. Thus, an extremely small amount of the lubricant is supplied to the disk 4 stably for a long period to improve its durability greatly.

Description

[Detailed Description of the Invention] The technical field "Kienori" is a magnetic recording medium in which a magnetic tape main body with a magnetic recording layer provided on a non-UA support is inserted into a plastic case with a non-woven fabric pasted on the inner surface. In accordance with

Conventional technology! 1) Direct I', Ki i, [2 缼哩・1・: Bar (7[, t
The recording medium U (1) is perpendicularly magnetized by applying a magnetic field to it for recording and production. As the density decreases, high-density recording increases by +1.,j.The first thing about this type of recording medium is self-11':rr.
4 is Co-based, Co-P-based monk] Metal Shusei? :n/l!
'Consists of self, 711 layers or many 1: ゛So A.11
There are many things that are combined.

However, the upper B level metal sand is 41, full 1! :: Although it has 5F and A for high-density recording, it is very hard and wears out the magnetic head, and it also has a gold maple property! The 7Jl fruit itself has the disadvantage of being easily scratched and wear-resistant.

For this reason, many proposals have been made in the past in which a protective film is formed on the surface of a metal magnetic thin film. For example, a very thin coating of higher fatty acids is deposited on a gold striped magnetic thin film. The sticking is carried out by applying a coating solution in which various lubricants and adhesives are dispersed in a solvent such as water or an organic solvent in a mixed bath jQ'FL onto the surface of the magnetic film. However, it has the drawback that it tends to cause uneven coating, and its performance deteriorates due to changes over time, such as drying due to temperature and peeling due to rubbing with the head. Furthermore, surface j abrasion resistance and yrstb resistance could not be sufficiently improved.

Purpose An object of the present invention is to solve the above-mentioned drawbacks and provide a magnetic recording medium that has excellent resistance to +1 damage and PD abrasion resistance.

In the invention, a magnetic disk body having a magnetic recording layer provided on a non-magnetic support is inserted into a plastic case with a non-woven fabric on the inside, and the magnetic recording layer is in contact with the non-woven fabric so that the magnetic disk body is In a rotating magnetic recording medium, the nonwoven fabric has the following general formula % (where Rf represents an inert fluorinated group, m.

The numerical value is shown so that the molecular weight of the n-coupling compound is 1,000 to 50,000. ) It is modified to contain perfluoroalkyl polyether represented by the following formula.

The non-ζ cloth used in the present invention includes rayon,
Polypropylene, polyester, etc.

The thickness is preferably 50 to 500μ.

For example, the plastic case can be made of vinyl chloride (1) or 191. The wall thickness of the case is not limited to t1, and it may be a flexible case or a hard case that does not easily deform.

In order to incorporate perfluoroalkyl polyether into a nonwoven fabric, the nonwoven fabric may be immersed in a solution prepared by mixing and dissolving chisel-fluoroalkyl polyether in a solvent such as water or an organic solvent. At this time, a binder or other additives may be added to the above-mentioned solution, or the sweetened ξ-gluo-alkyl polyether is wrapped in a well-known encapsulation method and then immersed in a non-woven fabric in the same manner.・You can also attach it. Parfu 1? Use of liluoloaral W-chill 1 is for older 1. 0.01 to 1 heavy-duty area per 1 piece of 'jj cloth 1007' is suitable).

(a) The airtight recording layer is made of gold magnetic thin J-like fiber, C0-P yarn, Co-based, Co-Fe-based, Co-Nl yarn, Co-
Known materials such as Cr type and Fe-Ni type are used in a single layer or in combination in a polygonal layer ψ'.

To make a magnetic recording medium suitable for books, it is necessary to apply magnetism to a non-magnetic support such as a polyester film by applying chemical plating, vacuum evaporation, snogging, ion-rating, etc. (The main body of the magnetic disk is made by preparing a trout and punching it out to a predetermined size, and then inserting the magnetic disk into a plastic case with a nonwoven fabric containing perfluoroalkyl polyether attached to the inner surface.) .

In use, the magnetic recording layer contacts the non-woven fabric and the magnetic disk body rotates, while the case remains unchanged.
When the magnetic recording head is in the correct position, it makes contact with the rotating disk.

Effects According to the present invention, perfluoroalkyl polyether contained in a nonwoven fabric can be stably and uniformly supplied to the surface of the magnetic recording layer over a long period of time. Since the alkyl polyether can be incorporated, the abrasion resistance, J° and abrasion resistance of the magnetic recording layer are improved, and the wear of the magnetic head is also reduced.

The effects of the present invention will be illustrated below using the ν side.

Example First, 191 Blood prepared a magnetic recording medium as shown in FIG. That is, by sputtering onto a 75μ thick (?? diester film support), a 0.5μ thick F
An e-Ni layer 2 is provided, and a 0.5μ thick Co-Cr
Layer 3 was provided. This was punched out to the size of a 5.25-inch magnetic flexible disk to produce a magnetic disk body 4.

Next, a 300 μ thick nonwoven fabric made of rayon (75%) and polypropylene (25%) was mixed with 1% FOMBLIN Z-25 manufactured by Nippon Montageson Co., Ltd. dissolved in Freon.
It was immersed in a mixed solution of and then dried. This nonwoven fabric was pasted in dots on a plastic plate made of vinyl chloride using heat-sealing and folded in half to produce a plastic case. Furthermore, a magnetic disk body 4 was inserted into a plastic case 6 to which a nonwoven fabric 5 was pasted 9 to form a magnetic recording medium.

Next, as shown in Fig. 2, a main magnetic pole 7 (made of a 2μ thick permalloy film sandwiched between glass plates) and an auxiliary magnetic pole 8 are formed.
(Mn-Zn ferrite) to sandwich the magnetic recording medium (Example 1) so that the magnetic disk body 4 is in contact with the recording medium.
Repeated playback. FOMBLIN on non-woven fabric for comparison
One in which Z-25 is not immersed (Comparative Example 1) and the above F
The metallic thin film was directly immersed in a mixed solution of OMBLIN Z-25 to create a film (Comparative Example 2) in which FOMBLIN Z-25 was stuck to the surface of the thin film, and recording and playback were repeated in the same manner. .

The number of times recording/playback is repeated until scratches occur, and 1
All measurements were taken until the output after one turn reached 50 degrees at the start. The results are shown in the table below.

From this, it can be seen that the magnetic recording medium of the present invention has much better resistance to printing and wear than the conventional ones.

[Brief explanation of drawings]

FIG. 1 is a schematic sectional view of a magnetic recording medium used in an embodiment of the present invention, and FIG. 2r1 is an explanatory diagram of a recording/reproducing section. 4...Magnetic disk body 5...Non-woven fabric 6...Plastic case Figure 1 Atsushi 2

Claims (1)

[Claims] 1. A magnetic disk body having a magnetic recording layer provided on a non-magnetic support is placed in a plastic case with a non-woven fabric affixed to the inner surface, and the magnetic recording layer In a magnetic recording medium having a means for rotating a magnetic disk in contact with the nonwoven fabric, the nonwoven fabric has the following general formula % (wherein Rf represents an inert fluorinated group, and +71.n is a molecule of the above compound). 111 is from 1,000 to 50,000.) A magnetic recording medium characterized by containing a chili-fluoroalkyl polyether represented by 15 magnetic notes according to claim 1.