JPH08297949A - Nonwoven fabric for liner of floppy disk and floppy disk using it - Google Patents

Abstract

PURPOSE: To obtain a nonwoven fabric for liner which does not generate dust and can prevent the surface of a floppy disk from being scratched and worn by using a nonwoven fabric obtained by using a binder resin component having a solubility parameter(SP) which falls within a specific range as the liner. CONSTITUTION: A nonwoven fabric obtained by adding a binder resin component having an SP of 9 and composed of the copolymer of an unsaturated polymerizable monomer and unsaturated crosslinking monomer which is copolymerizable with the polymerizable monomer to fibers is used as a liner for floppy disk. When this liner is used, the durability of a floppy disk can be improved without deteriorating the characteristics of the floppy disk, because no fiber nor binder falls down and dust does not occur form the nonwoven fabric, and then, the surface of a floppy disk can be prevented from being scratched and worn.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-woven fabric for a floppy disc liner and a floppy disc using the same, and more specifically, it is free from dust.
The present invention also relates to a non-woven fabric for a floppy disc liner that prevents scratches and abrasion on the floppy disc surface and a floppy disc having excellent durability.

[0002]

2. Description of the Related Art Conventionally, the problems to be solved by the invention
When a general non-woven fabric is used as a liner for a floppy disk, fibers and binders fall off from the non-woven fabric during the production and use of the floppy disk, causing fiber dust (lint) to adhere to the surface of the floppy disk. Or scratched the surface, causing a disk error.

As a particularly prominent example, in a heat embossing type liner which is very often used in 3.5-inch floppy disk cartridges, ultrasonic welding when installing the liner and ultrasonic waves when sealing the shell are used. Due to the welding, there is a problem that lint, dust, or the like attached to or in the liner drops onto the surface of the floppy disk and adheres to the surface of the floppy disk, or scratches the surface to cause a reduction in reproduction output.

Particularly in recent years, development of floppy disks has been focused on micronization, high density and high speed rotation, and development of a high performance liner capable of meeting these requirements is strongly desired.

Therefore, an object of the present invention is to provide a non-woven fabric for a floppy disk liner which does not generate dust and prevents scratches and abrasion on the floppy disk surface and a floppy disk having excellent durability. .

[0006]

[Means for Solving the Problems] As a result of intensive studies, the present inventors have found that the solubility coefficient (Solubility Parameter Value,
Hereinafter, by using a non-woven fabric obtained by using a binder resin component having a specific range of (SP) as a floppy disc liner, the binder is transferred to the medium of the floppy disc while improving the adhesiveness of the binder to the non-woven fabric fiber. It was found that this can be prevented.

The present invention has been made on the basis of the above findings, and provides a nonwoven fabric for a floppy disk liner characterized in that a fiber is provided with a binder resin component having a solubility coefficient (SP) of 9 or more. The above-mentioned object is achieved. The present invention also provides a floppy disk using the above nonwoven fabric for a floppy disk liner.

The present invention will be described in detail below. The non-woven fabric for a floppy disk liner of the present invention is a non-woven fabric for a floppy disk liner obtained by applying a specific binder resin component to a fiber, and the binder resin component has a SP within a specific range.

The specific binder resin component used in the present invention is a binder resin component having an SP of 9 or more, preferably 9.5 or more. When the SP of the binder resin component is less than 9, in a floppy disk using a nonwoven fabric for a floppy disk liner in which the binder resin component is applied to fibers, the nonwoven fabric absorbs the lubricant used in the medium of the floppy disk. It will be easier. Therefore, the amount of the lubricant present on the media surface is reduced, as a result, the slipperiness of the media surface is lost, the media surface is easily scratched, and the wear resistance is significantly reduced, and the durability of the floppy disk is reduced. This is because it causes a decrease.

In the present invention, the SP means Poly
mer Handbook (John Wiley & Sons. Inc. 2nd Edition,
edited by J. Brandrwp et al, 1975, P. 377), which is a value calculated based on the following Small formula. Small's equation δ (SP) = dΣG / M In the above equation, ΣG is the total of the cohesive energy constants of atoms and functional groups in the molecule, d is the density (g / cm ³ ), and M is the molecular weight.

The resin component having an SP of 9 or more used in the present invention is not particularly limited, but examples thereof include a polymerizable unsaturated monomer and a crosslinkable unsaturated monomer copolymerizable with the monomer. Examples thereof include a binder resin component composed of a copolymer of

The binder resin component used in the present invention is
It is obtained by forming a binder resin emulsion composed of a binder resin component obtained by copolymerizing (for example, emulsion polymerization described below) the polymerizable unsaturated monomer and the crosslinkable unsaturated monomer. The binder resin emulsion has very good adhesion to fibers when applied to a nonwoven web.

The above-mentioned polymerizable unsaturated monomer is not particularly limited, but for example, methyl acrylate, methyl methacrylate, ethyl acrylate, ethyl methacrylate, isopropyl acrylate, isopropyl methacrylate, n-butyl acrylate, n-butyl. Methacrylate, iso-butyl acrylate, iso-
Butyl methacrylate, n-amyl acrylate, n
-Amylmethacrylate, iso-amylacrylate, iso-amylmethacrylate, n-hexylacrylate, n-hexylmethacrylate, 2-ethylhexylacrylate, 2-ethylhexylmethacrylate, octylacrylate, octylmethacrylate, decylacrylate, decylmethacrylate Acrylate,
Dodecyl acrylate, dodecyl methacrylate, octadecyl acrylate, octadecyl methacrylate, cyclohexyl acrylate, cyclohexyl methacrylate, phenyl acrylate, phenyl methacrylate, benzyl acrylate, methacrylic acid ester derivatives such as benzyl methacrylate; vinyl acetate, Vinyl esters such as vinyl propionate; styrene, vinyltoluene, 2
-Aromatic vinyls such as methylstyrene, t-butylstyrene, chlorostyrene, vinylanisole, vinylnaphthalene and divinylbenzene; acrylamide, methacrylamide, n-monoethylacrylamide, n-monoethylmethacrylamide, dimethylacrylamide,
Amides such as dimethylmethacrylamide, t-butylacrylamide, t-butylmethacrylamide, diacetoneacrylamide; divinylbenzene, 1,4-butanediol diacrylate, 1,4-butanediol dimethacrylate, polyethylene glycol diacrylate, Polyfunctional monomers such as polyethylene glycol dimethacrylate; and polymerizable monomers having an unsaturated double bond such as acrylonitrile and methacrylonitrile. Among these, methyl methacrylate, ethyl acrylate, n-butyl acrylate, 2-ethylhexyl acrylate, acrylonitrile and the like are preferably used. In the present invention, the polymerizable unsaturated monomer may be used alone or in combination of two or more kinds.

The crosslinkable unsaturated monomer copolymerizable with the above polymerizable unsaturated monomer is not particularly limited, but examples thereof include methylol groups such as n-monomethylol acrylamide and n-monomethylol methacrylamide; Acrylic acid, methacrylic acid, maleic acid, fumaric acid, crotonic acid, itaconic acid and other carboxyl groups; 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, hydroxypropyl acrylate, hydroxypropyl methacrylate and other hydroxyl groups; glycidyl Crosslinkable unsaturated monomers having an epoxy group such as acrylate and glycidyl methacrylate; n-butoxymethyl acrylamide, n-butoxymethyl methacrylamide, isobutoxymethyl acrylamide, isobutoxymethyl methacrylamide Riruamido, and the like. Among these, n-monomethylol acrylamide, acrylic acid, methacrylic acid, itaconic acid, 2-hydroxyethyl acrylate, glycidyl acrylate, n-butoxymethyl acrylamide and the like are preferably used. In the present invention, the crosslinkable unsaturated monomer may be used alone or in combination of two or more kinds.

The ratio (weight basis) of the total amount of the polymerizable unsaturated monomers used and the total amount of the crosslinkable unsaturated monomers used is preferably 99.5 / 0.5 to. 80 /
20 and more preferably 97/3 to 85/15. If the total amount of the polymerizable unsaturated monomers used exceeds 99.5 parts by weight, the adhesive force between the fibers will be small, the morphology of the liner cannot be maintained, and the binder will be too soft. , Friction between the liner and the floppy disk, damage to the disk surface due to wear,
This may cause floppy disk playback failure. Also, 80
If the amount is less than the weight part, the flexibility of the binder may be deteriorated, the flexibility of the liner may be impaired, the cleaning effect may not be sufficient, and the disk surface may be damaged, which may cause defective reproduction of the floppy disk. It is preferably within the above range.

The binder resin component can be synthesized by a known emulsion polymerization method. For example, a mixture of the polymerizable unsaturated monomer and the crosslinkable unsaturated monomer in the above proportions is added dropwise to an appropriate amount of water containing a small amount of an emulsifier and a polymerization initiator to give the above polymerizable unsaturated monomer. It can be synthesized by emulsion-polymerizing a saturated monomer and the above crosslinkable unsaturated monomer.

The emulsifier is not particularly limited, and examples thereof include general anionic surfactants, cationic surfactants and nonionic surfactants.

Examples of the anionic surfactant include alkylbenzene sulfonate, alkylnaphthalene sulfonate, polyethylene oxide alkyl ether sulfate, etc. In the present invention, these anionic surfactants may be used alone. Alternatively, two or more kinds may be used in combination.

Examples of the above-mentioned cationic surfactants include primary, secondary and tertiary amine salts having an aliphatic hydrocarbon, quaternary ammonium and the like. In the present invention, these are used. The cationic surfactants can be used alone or in combination of two or more kinds.

Examples of the nonionic surfactants include polyethylene oxide alkyl ether, polyethylene oxide alkylphenyl ether, polyethylene oxide-polypropylene oxide block copolymer, and the like. In the present invention, these nonionic surfactants are used. They can be used alone or in combination of two or more.

Further, in the present invention, for example, an anionic surfactant and a nonionic surfactant may be combined, or a cationic surfactant and a nonionic surfactant may be used in combination.

The above-mentioned polymerization initiator is not particularly limited, but examples thereof include hydroperoxides such as cumene hydroperoxide and diisopropylbenzene hydroperoxide, peroxides such as benzoyl peroxide and lauroyl peroxide, and azobisisobutyrate. Examples thereof include organic polymerization initiators such as azo compounds such as ronitrile, and inorganic polymerization initiators such as persulfates such as potassium persulfate, sodium persulfate and ammonium persulfate. These polymerization initiators can be used alone or in combination of two or more kinds. Further, a so-called redox-based polymerization initiator, which uses a reducing agent such as sodium bisulfite, ascorbic acid and a salt thereof in combination with the polymerization initiator, can also be used.

If desired, a melamine resin, an epoxy resin, a urea resin, a metal compound or the like may be added to the emulsion polymer as a crosslinking agent and used as a binder resin component.

The proportion of the solid content in the binder resin emulsion comprising the binder resin component thus obtained is generally 3 to 50% by weight, preferably 5 to 50% by weight.
It is 20% by weight. The moisture absorption amount of the binder resin component is preferably 20% or less, more preferably 15% or less. When the moisture absorption exceeds 20%,
Not only does the adhesive strength between the binder resin component and the fibers described below decrease, but the frictional force between the liner and the media increases, and as a result, the media surface is easily scratched, and the abrasion resistance is significantly reduced, and Since it may cause deterioration of durability, it is preferably within the above range.

In the binder resin emulsion thus obtained, various additives such as, for example,
A nonionic surfactant such as polyoxyethylene nonyl phenyl ether and an anionic surfactant such as sodium dodecyl sulfate can also be added. The amount of these additives added is 0.1 to 5% based on the weight of the binder.
It is 0%. Further, if necessary, an antistatic agent, an antifungal agent or the like may be added.

The amount of the binder resin component used in the non-woven fabric for a floppy disk liner of the present invention is 1 to 50% by weight (solid content) based on the weight of the fibers constituting the non-woven fabric for a floppy disk liner of the present invention. It is preferably 5 to 30% by weight, and more preferably 5 to 30% by weight. If the amount of the binder resin component used is less than 1% by weight, the adhesive force between the fibers of the non-woven fabric is small and the liner shape cannot be maintained. If the amount of the binder resin component used exceeds 50% by weight, the cleaning effect is sufficient. However, the friction and abrasion between the binder and the floppy disk may cause scratches on the surface of the floppy disk, which may cause defective reproduction of the floppy disk.

The fibers used in the nonwoven fabric for the floppy disk liner of the present invention are not particularly limited, but conventionally known fibers can be used. For example, rayon,
Polyester, nylon, polypropylene, polyethylene and the like can be used. Further, if necessary, core-sheath type fibers or side-by-side type fibers which are composite fibers using two kinds of fibers having different melting points can be used.
These fibers may be used alone or in combination of two or more.

The fibers may be in the form of continuous filaments or staple fibers. When the above fibers are used in the form of staple fibers, it is generally preferable that the fiber length is 1.0 to 5.0 cm. When the fiber length is within this range, a web can be uniformly manufactured, the obtained nonwoven fabric has a good texture, and a sufficient dust wiping action is exhibited.

The fiber diameter of the above fibers is not particularly limited,
Generally, it is preferably 1.0 to 2.0 denier.
When the fiber diameter is within this range, the web can be uniformly manufactured, the obtained nonwoven fabric has a good texture, and a sufficient dust wiping action is exhibited.

For the floppy disk liner of the present invention
Woven cloth generally has a basis weight of 30 to 50 g / m.²And
, Preferably 35-45 g / m²Is. Basis weight is 30
g / m ²Less than as a floppy disk liner
The effect is reduced, the dust wiping action is reduced, and the floppy
-The disc may be damaged. Also, if the basis weight is
50 g / m²If it exceeds, the thickness and elasticity of the nonwoven fabric will increase.
The rotation torque of the floppy disk becomes high and the floppy disk
-The smooth rotation of the disc is impaired.

Next, a preferred method for producing the nonwoven fabric for a floppy disk liner of the present invention will be described. The non-woven fabric for a floppy disk liner of the present invention is produced by applying the binder resin component to the fiber, and is not limited to the production method, but usually, the web described below is produced from the fiber, and the web is used. Is impregnated with a binder resin component.

For the preferred method for producing the above-mentioned non-woven fabric for a floppy disk liner of the present invention, "Basics and Applications of Non-woven Fabrics" (Japan Textile Machinery Society) P.139, "Development and Application of Functional Non-woven Fabrics" (CMC) P .29 and U.S. Pat. No. 2,719,795 and U.S. Pat. No. 2,719,802.
It can be performed with reference to the method described in the specification.
The method will be described below.

The method for producing the non-woven fabric for a floppy disk liner comprises forming a binder resin emulsion containing the binder resin component into a foam and then applying the emulsion to a web. As the binder resin component, it is preferable to use the binder resin component used in the above-mentioned nonwoven fabric for floppy disk liner of the present invention.

In order to produce the above-mentioned web, the above-mentioned fibers are generally applied to a card machine to form a web, but the method is not limited to this method, and for example, a spunbond method, a spunlace method or the like may be used.

Next, the binder resin component is applied to the obtained web. At this time, a binder resin emulsion containing the binder resin component is foamed and applied to the web (foam coating). To make the binder resin emulsion foamy, the binder resin emulsion can be foamed by a general mixer, mixer, forming machine or the like. After impregnating the web with the foamy binder resin emulsion, the excess liquid is squeezed by a roll such as a mangle. When the binder resin emulsion has a low foaming property when the binder resin emulsion is foamed, a surfactant that improves the foaming property may be added to the binder resin emulsion, if necessary. There are no particular restrictions on the type or addition amount of this surfactant. As another method of applying the binder resin component to the web, there are a method of applying the binder resin emulsion to the foam and then coating the web, a method of spraying the binder resin emulsion on the web, and the like.

After applying the binder resin component to the web, the water or organic solvent in the binder resin emulsion is removed by drying, and the binder resin emulsion is cured to obtain a nonwoven fabric for liner. As a method for drying and curing the web provided with the binder resin component, methods such as hot air, hot roll, infrared ray, microwave, and heat calendering can be used, but are not particularly limited to these methods. Absent. The temperature for curing the binder resin emulsion is generally 11
Temperatures above 0 ° C are preferred.

After the web obtained by curing the binder resin emulsion in this manner is made into a non-woven fabric, the fibers of the non-woven fabric can be heat-melted to further bond the fibers, if necessary, and further, if necessary, It can be embossed to further strengthen the bond between the fibers.

Further, according to the present invention, there is provided a floppy disk using the above nonwoven fabric as a liner.
The floppy disk of the present invention comprises a magnetic disk having a magnetic layer formed on the surface thereof, two liners arranged so as to contact both sides of the magnetic disk, an upper shell and a lower shell. ing. The magnetic disk has a hub fixed via a ring, and engages with a hub drive mechanism provided in the disk drive to rotate.

Notches for the magnetic head to access the magnetic disk are formed in the upper shell and the lower shell. The cutout is usually covered by a shutter provided so as to cover the cutout. The shutter is slidable by a shutter spring.

The two liners are arranged between the magnetic disk and the upper shell and the lower shell, respectively. The liner exists in at least approximately the same space as the magnetic layer of the magnetic disk. Further, the liner has notches substantially similar to the notches of the upper shell and the lower shell, and the magnetic head can access the magnetic layer of the magnetic disk by aligning the positions with the notches of the upper shell and the lower shell. It is like this.

The liner is fixed to the upper and lower shells so that it does not move to obstruct access of the magnetic head through the notch. The liner is secured to the upper and lower shells in alignment with the notches, for example using spot welding.

A lifter is arranged between the lower shell and the liner, whereby the liner and the magnetic disk come into close contact with each other and the surface of the magnetic disk is cleaned.

[0043]

The present invention will be described in more detail with reference to the following examples. Needless to say, the scope of the present invention is not limited to such examples. In the following description, parts represent parts by weight unless otherwise specified.

Example 1 A separable flask equipped with a stirrer, a thermometer and a reflux condenser was charged with 150 parts of water, and the temperature was raised to 80 ° C. while stirring the inside of the flask with nitrogen. In advance, 275 parts of water, 16 ethyl acrylate
8.3 parts, n-butyl acrylate 56.7 parts, methyl methacrylate 45 parts, acrylic acid 30 parts, ammonium persulfate 1.5 parts and surfactant Emal 20C (manufactured by Kao Corporation, solid content 25%) 24 Part of the emulsion was added under stirring to the emulsion, and the emulsion was added dropwise to the separable flask over 2 hours for polymerization. Further, aging was carried out at 80 ° C. for 2 hours to prepare an acrylic emulsion. After cooling, 133.7 parts of a 30% magnesium acetate solution was added to the acrylic emulsion to obtain a binder resin emulsion consisting of a self-crosslinking type binder resin component (nonvolatile component 38.8%, pH = 1.8). Solubility coefficient and moisture absorption of the binder resin component thus obtained,
It was measured by the method described below. Table 1 shows the results.
Next, the binder resin emulsion is diluted with water so that the solid content concentration becomes 10% by weight, foamed with a mixer, and a web made of rayon / polyester (75 parts / 25 parts) is filled with the binder resin component having the above content. It was applied so as to be 14% by weight (solid content) with respect to the weight of the web.
Next, this web was dried and heat-treated at 150 ° C. for 10 minutes to bond the fibers of the web to obtain a nonwoven fabric. The degree of scratching on the medium surface of the thus obtained nonwoven fabric, the amount of dust generation, and the durability were measured by the following methods.
Table 1 shows the results.

<Measurement of Solubility Coefficient> Using a binder resin emulsion, a binder film having a thickness of 0.5 mm was produced and dried at 120 ° C. for 30 minutes with hot air. This film is cut into about 1 mm square, and the value measured with a multi-volume densimeter (manufactured by Shimadzu Corporation) is the density d
(G / cm ³ ). Further, ΣG and M were calculated from the compositions of the polymerizable unsaturated monomer and the crosslinkable unsaturated monomer, and the calculated values were substituted into the Small's formula to obtain the solubility coefficient.

<Measurement of Moisture Absorption> Using a binder resin emulsion, length 100 mm × width 20 mm × thickness 0.
A 5 mm binder film is prepared, dried, and left for 3 days in a desiccator controlled at 25 ° C. and 100% RH (relative humidity). From the weight change before and after moisture absorption, the amount of moisture absorption was calculated by the following formula. Moisture absorption amount (%) = [(weight after moisture absorption−weight before moisture absorption) / weight before moisture absorption] × 100

<The degree of scratches on the surface of the medium> 3 cm of a non-woven fabric of 2 cm ² was used for the medium for the floppy disk.
Press with a load of 60g. In this state, an abrasion tester (FM-5S type manufactured by Sanko Seisakusho) is used to rotate the medium at 100 rpm for 1 hour. The degree of scratches on the medium surface after 1 hour of rotation was visually judged and evaluated according to the following evaluation criteria. ○: No scratches are recognized. Δ: A slight scratch is recognized. X: Many scratches are recognized.

<Dust generation amount> Ten pieces of non-woven fabric cut into 10 cm × 10 cm were prepared and subjected to ultrasonic vibration (BRANSON Model N
o.8400) for 0.2 seconds, and the lint generated by it is counted by a particle counter (KC-20 manufactured by Rion).
To measure. The lint number having a size of 5 to 10 μm is taken as the value of the amount of dust generated from the nonwoven fabric.

<Durability Test> A floppy disk medium having a reproduction output of a certain level or more is incorporated into a shell to which a non-woven fabric is attached as a liner, and an evaluation floppy disk is assembled. 1000 this floppy disk
Rotate 10,000 passes. The playback output of the above media after rotation is measured. This operation is performed for 10 floppy disks, and the number of floppy disks for which an error has occurred in reproduction output is counted.

Example 2 A separable flask equipped with a stirrer, a thermometer and a reflux condenser was charged with 495 parts of water and 28 parts of Emar 20C (manufactured by Kao Corporation, solid content 25%), and nitrogen substitution was performed with stirring. While raising the temperature to 80 ° C. 1.75 parts of ammonium persulfate were added to the flask. Then, in advance, in another flask, 80.4 parts of ethyl acrylate, 146.7 parts of n-butyl acrylate,
Acrylonitrile 105 parts, acrylic acid 7.5 parts, n-
The monomer composition prepared by mixing 10.5 parts of methylolacrylamide was added dropwise into the separable flask for 2 hours for polymerization. 2 at 80 ° C
After aging for a period of time and cooling, a binder resin emulsion composed of a self-crosslinking binder resin component was obtained (nonvolatile component 40.5%, pH = 3.5). The solubility coefficient and moisture absorption of the binder resin component thus obtained are shown in Table 1. Then, using the above binder resin emulsion, the amount of binder resin component used relative to the web is 1
A non-woven fabric was obtained by performing the same operations as in Example 1 except that the amount was 5% by weight (solid content). Table 1 shows the evaluation results of the degree of scratches on the media surface of the obtained nonwoven fabric, the amount of dust generation, and the durability.

Example 3 The same as Example 1 except that a monomer component consisting of 240 parts of 2-ethylhexyl methacrylate, 45 parts of methyl methacrylate, 6 parts of acrylic acid, and 9 parts of n-methylol acrylamide was used. The operation was performed to obtain a binder resin emulsion (nonvolatile component 39.8%, pH 3.4). The solubility coefficient and moisture absorption of the binder resin component thus obtained are shown in Table 1. Next, the binder resin emulsion was diluted with water so that the solid content concentration became 5% by weight, and foamed with a mixer to obtain rayon / polyester (75 parts / 25 parts).
Part) was applied so that the amount of the binder resin component was 17% by weight (solid content) with respect to the weight of the web. Then, this web was dried and heat-treated at 180 ° C. for 2 minutes to bond the fibers of the web to obtain a nonwoven fabric.
Table 1 shows the evaluation results of the degree of scratches on the media surface of the obtained nonwoven fabric, the amount of dust generation, and the durability.

Comparative Example 1 The same evaluation as in Example 1 was performed using a commercially available heat embossed type nonwoven fabric (# 246, manufactured by Veratec) as a nonwoven fabric for a floppy disk liner. Table 1 shows the evaluation results.

Comparative Example 2 PVA (polyvinyl alcohol, Nippon Gosei Co., Ltd., Gohsenol NH-20) 8%
A nonwoven fabric was obtained by performing the same operation as in Example 1 except that the aqueous solution was used as the binder resin component and the amount of the solid component used relative to the web was 16% by weight (solid content). Above PV
Table 1 shows the solubility coefficient and moisture absorption of the solution A, and the evaluation results of the obtained nonwoven fabric.

[0054]

[Table 1]

From the above results, it is understood that the nonwoven fabric for the floppy disk liner of Comparative Example 1 which does not use the binder resin has a very large amount of dust generation, and the floppy disk using the same is inferior in durability. The nonwoven fabric for a floppy disk liner of Comparative Example 2 using PVA as the binder resin showed no migration of the lubricant from the medium to the liner, but when left unattended, the strength of the liner was lowered and at the same time as a liner. The media caused blocking and became easily scratched.
Moreover, the floppy disk using the same was inferior in durability. In addition, the non-woven fabrics for the floppy disk liners of Examples 1 to 3 were free from scratches and produced a small amount of dust. Further, the floppy disk using it had excellent durability.

[0056]

INDUSTRIAL APPLICABILITY The non-woven fabric for a floppy disk liner according to the present invention has no or very little lint, and has less scratches or abrasion on the floppy disk surface.

Claims (5)

[Claims] 1. A non-woven fabric for a floppy disk liner, characterized in that a fiber is provided with a binder resin component having a solubility coefficient (SP) of 9 or more. 2. The floppy disk liner according to claim 1, wherein the binder resin component comprises a copolymer of a polymerizable unsaturated monomer and a crosslinkable unsaturated monomer copolymerizable with the monomer. Non-woven fabric. 3. The moisture absorption of the binder resin component is 20.
% Or less, and the nonwoven fabric for a floppy disk liner according to claim 1 or 2. 4. The nonwoven fabric for a floppy disk liner according to claim 1, wherein the binder resin component is used in an amount of 1 to 50% by weight (solid content) with respect to the weight of the fiber. 5. A floppy disk using the nonwoven fabric for a floppy disk liner according to claim 1.