JP2642188B2 - Adhesive base material and method for producing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a substrate for application such as for a poultice medicine and for an emergency bandage.

<Conventional technology> Conventionally, cloths such as muslin and sufmos and vinyl films have been widely used as a substrate for application. Also,
It has already been proposed to use a nonwoven fabric as a substrate for application. For example, on one side of a non-woven fabric having a large number of fine pores, an adhesive material in which a transparent thin film of an ethylene-vinyl acetate copolymer is laminated is disclosed in Japanese Utility Model Publication No. 60-23287, and a polyurethane elastic filament that is melt-spun is laminated. JP-A-61-22855 proposes a medical pressure-sensitive adhesive sheet using the obtained polyurethane elastic fiber nonwoven fabric as a base material such as a skin adhesive.

<Problems to be Solved by the Invention> The conventional base material for application has a drawback that it has almost no elasticity and lacks flexibility, so that it has poor skin contact properties and lacks air permeability, so that it is stuffy. Improving the sense of discomfort is needed. Further, there is a problem that the amount of applied medicine is large.

Also, when using a saponified ethylene-vinyl acetate copolymer or polyurethane used in conventional melt spinning, a melt extrudate is formed into a fiber stream with a high-pressure gas jet,
In a method for producing a nonwoven fabric by a so-called melt blown spinning method in which a nonwoven fabric is conveyed and collected in a sheet shape, a sufficiently thinned and oriented fiber cannot be obtained, and a fiber stream having good uniformity cannot be formed. Therefore, the thickness and the fiber length of the fibers are non-uniform, and it is not possible to obtain a sticking substrate having a good texture. In particular, it is difficult to make a wide nonwoven fabric having a width exceeding 1 m by the meltblown method into a meltblown nonwoven fabric with good uniformity.

The present invention is to provide a dense and flexible non-woven fabric for bonding, which is a soft and flexible non-woven fabric having good uniformity, good wettability, good lipophilicity, and suitable for a bonding substrate. is there.

<Means for Solving the Problems> The present invention relates to a polymer mainly composed of a saponified ethylene-vinyl acetate copolymer having an ethylene content of 40 to 60 mol% and an intrinsic viscosity [η] of 0.055 to 0.085 / g. And a nonwoven fabric having an average fiber diameter of 8 μm or less, which is a nonwoven fabric having a mean fiber diameter of 8 μm or less.

Further, the present invention relates to 95 to 60% by weight of a polymer mainly composed of a saponified ethylene-vinyl acetate copolymer having an ethylene content of 40 to 60 mol% and an intrinsic viscosity [α] of 0.055 to 0.085 / g, and a soft It has a segment content of 45 to 75% by weight and an intrinsic viscosity [η] of a chain extender mainly composed of diol of 0.
Polyurethane-based polymer 5 in the range of 05 to 0.10 / g
It is composed of a melt-blown ultrafine fiber nonwoven fabric having an average fiber diameter of 8 μm or less, which is a mixed spun fiber of 4040% by weight, and at least one surface is a surface to which most of the contact portions of the fibers are bonded in a discontinuous pattern. It is a base material for sticking.

Further, the present invention relates to 95 to 60% by weight of a polymer mainly composed of a saponified ethylene-vinyl acetate copolymer having an ethylene content of 40 to 60 mol% and an intrinsic viscosity [η] of 0.055 to 0.085 / g, and polyolefin. It is composed of a melt-blown ultrafine fiber nonwoven fabric having an average fiber diameter of 8 μm or less composed of 5 to 40% by weight of mixed spun fibers, and at least one surface is a surface to which most of the contact portions of the fibers are adhered in a discontinuous pattern. It is a sticking substrate.

Furthermore, the present invention relates to a meltblown ultrafine polymer having an average fiber diameter of 8 μm or less which is a polymer mainly composed of a saponified ethylene-vinyl acetate copolymer having an ethylene content of 40 to 60 mol% and an intrinsic viscosity of 0.055 to 0.085 / g. 95-60% by weight of fiber and 5 to 40% by weight of melt-blown ultrafine fiber having an average fiber diameter of 8 μm or less composed of polyolefin, and at least one surface of the fiber is in a discontinuous pattern and most of the contact portion of the fiber Is a substrate to which the adhesive is applied.

Then, the present invention melts a polymer mainly composed of a saponified ethylene-vinyl acetate copolymer having an ethylene content of 40 to 60 mol% and an intrinsic viscosity [η] of 0.055 to 0.085 / g, and spinning by a melt blown method. To form an ultrafine fiber stream having an average fiber diameter of 8 μm or less, and to collect the outer fiber stream in a sheet form to form an ultrafine fiber nonwoven fabric, and to densify at least one side of the fiber and to form a discontinuous pattern in the majority of the contact portions of the fibers. Is a process for producing a base material for application.

Further, the present invention relates to 95 to 60% by weight of a polymer mainly composed of a saponified ethylene-vinyl acetate copolymer having an ethylene content of 40 to 60 mol% and an intrinsic viscosity [η] of 0.055 to 0.085 / g; It has a segment content of 45 to 75% by weight and an intrinsic viscosity [η] of a chain extender mainly composed of diol of 0.
5 to 40% by weight of a polymer mainly composed of polyurethane or a polymer selected from polyolefin in the range of 06 to 0.12 / g
Is melted and spun by a melt blown method to form a mixed spun ultrafine fiber stream having an average fiber diameter of 8 μm or less, and the outer fiber stream is collected into a sheet to form an ultrafine fiber nonwoven fabric, and at least one surface is dense. A process for producing a base material for application, characterized in that a process for bonding most of the contact portions of the fibers in a non-continuous pattern is performed.

Further, the present invention melts a polymer mainly composed of a saponified ethylene-vinyl acetate copolymer having an ethylene content of 40 to 60 mol% and an intrinsic viscosity [η] of 0.055 to 0.085 / g, and spinning the melt-blown polymer. To form a microfiber stream I having an average fiber diameter of 8 μm or less, while a polymer selected from polyolefin is melted and spun by a melt blown method to form an ultrafine fiber stream II having an average fiber diameter of 8 μm or less. The outer fiber streams I and II are mixed in a weight ratio of 95 to 60% by weight of the fiber stream I and 5 to 40% by weight of the fiber stream II, and collected into a sheet to form a microfiber mixed nonwoven fabric. And a process for densifying at least one surface and bonding most of the contact portions of the fibers in a discontinuous pattern.

That is, the present invention relates to ethylene-
Ultrafine fiber nonwoven fabric obtained by spinning a saponified vinyl acetate copolymer or a mixed polymer of an ethylene-vinyl acetate copolymer and another polymer by a melt blown spinning method, or an ethylene-vinyl acetate copolymer. An object of the present invention is to produce an ultrafine fiber nonwoven fabric which is composed of an ultrafine fiber mixed nonwoven fabric of a meltblown ultrafine fiber and a polyolefin meltblown ultrafine fiber, has good uniformity, is flexible, and has good skin contact properties.

The present invention is to use a saponified ethylene-vinyl acetate copolymer having an ethylene content of 40 to 60 mol% and an intrinsic viscosity [η] of 0.055 to 0.085 / g as measured in a solution of the polymer. . When the ethylene content of this polymer is less than 40 mol%, the thermal stability of the polymer is deteriorated, the melt viscosity is increased, and an infusible substance (gel-like substance) is generated, so that a stable melt blown Since the process spinning cannot be performed, a good fiber flow cannot be formed, or the nonwoven fabric contains a large amount of particulate matter such as unmelted particulate matter. On the other hand, if the ethylene content is 60
When the content exceeds mol%, the rigidity, tensile properties, dyeability, hygroscopicity and heat resistance of polyvinyl alcohol decrease,
The touch of the nonwoven fabric becomes unfavorable, such as polyolefin or wax. Further, when the intrinsic viscosity [η] of the polymer is out of the range of 0.055 to 0.085 / g and the intrinsic viscosity [η] is small, the melt viscosity is small, and sufficient spinnability is not obtained, and the polymer is sufficiently fine. It is not possible to form a good non-woven fabric with good uniformity because it is not possible to form a good fiber flow, or many fine balls are mixed in the non-woven fabric,
Since the strength of the nonwoven fabric is low, the stiffness is lost, and the heat resistance is lowered, so that it is not preferable as a base material for application. On the other hand, when the intrinsic viscosity [η] exceeds 0.085 / g and becomes a high viscosity, the melt blown method forms a fiber stream of sufficiently thinned and oriented fibers and cannot be stably spun, resulting in poor uniformity. It is a very fine fiber non-woven fabric, the strength of the non-woven fabric is weak, the texture is coarse and hard, and it is not suitable as a base material for application. Further, the saponification degree of vinyl acetate of the ethylene-vinyl acetate copolymer is 80 mol% or more, preferably 90 mol% or more. If the degree of saponification is small, not only the hygroscopicity and heat resistance are lowered, but also the texture becomes hard, which is not preferable as a base material for application.

The polyurethane used in the present invention has an average molecular weight of
500 to 3000 polymer diols such as polyester diols, polyether diols, polyester ether diols, polycaprolactone diols, polycarbonate diols and at least one polymer diol and an organic polyisocyanate such as tolylenediene At least one selected from the group consisting of aromatic diisocyanates such as isocyanate, xylylene diisocyanate, diphenylmethane diisocyanate, diphenylmethane diisocyanate, and isophorone diisocyanate, aliphatic diisocyanates having a cyclic group, and alicyclic diisocyanates. Kinds of organic diisocyanates and low molecular weight compounds having a molecular weight of 400 or less having at least two active hydrogen atoms as chain extenders, for example, diols, amino acids It is a polyurethane obtained by reacting at least one compound selected from the group of alcohol, diamine, and the like. Further, as a preferable soft segment for obtaining a polyurethane having higher flexibility and elasticity, at least 40% by weight of a low molecular weight diol is a condensation polymerization of an aliphatic diol having 5 to 12 carbon atoms having a side chain with a dicarboxylic acid. Is a polymer diol mainly composed of a polyester diol having an average molecular weight of 500 to 3,000, and the chain extender is a chain extender mainly composed of a low molecular weight diol. Then, a polymer diol, an organic diisocyanate, and a chain extender are selected in a desired composition ratio, and polymerized by a melt polymerization method, a bulk polymerization method, a solution polymerization method, or the like to obtain a polyurethane. In order to obtain a nonwoven fabric having good uniformity, the content of the polymer diol serving as a soft segment is 45 to 75% by weight in the composition at the time of polyurethane production, and the chain extender is mainly composed of a diol. And polymerize. And
In the case of polyurethane used in the form of pellets, the intrinsic viscosity after pelletization (η) is in the range of 0.06 to 0.12 / g in consideration of the decrease in viscosity during melt spinning of polyurethane, and the polymerization is performed so that the viscosity becomes higher. adjust. In addition, when polymerized by the melt polymerization method, when the ultrafine fiber nonwoven fabric is directly formed by melt blown spinning without pelletizing, it is not necessary to consider a decrease in viscosity during spinning, and the intrinsic viscosity after spinning (η)
Is adjusted to be in the range of 0.05 to 0.10 / g. Also,
The content of the soft segment in the polyurethane is in the range of 45 to 75% by weight, and when the content of the soft segment is less than 45% by weight, the spinning property and the formation of ultrafine fibers are good.
It is not preferable in terms of softening, stretching, stabilizing the form, smoothness of the surface as a base material for application, and skin contactability of the nonwoven fabric.
On the other hand, when the content of the soft segment exceeds 75% by weight, the softness of the nonwoven fabric is good, but the spinnability and ultrafine fiber are deteriorated, and a fine fiber nonwoven fabric with good formation cannot be obtained. When the intrinsic viscosity [η] of the polyurethane is small, a sufficiently fine fiber cannot be obtained, and a non-woven fabric of fibers having an uneven thickness is obtained. On the other hand, when the intrinsic viscosity [η] of the polyurethane is large, the melt viscosity becomes high, and it is not possible to obtain a good flow of ultrafine fibers.

As the polyolefin used in the present invention, for example, polyethylene, ethylene propylene copolymer, ethylene 1-butene copolymer, ethylene 1-octene copolymer, polypropylene, polyolefins such as polybutene, or wetted with these polyolefins It is at least one kind of polymer selected from the group of polyolefin and the like to which a property is imparted. Preferably, the melt viscosity is ASTM D-12.
The melt flow rate (hereinafter abbreviated as MI) value measured by the 38 method is in the range of 30 to 100 g / 10 minutes of polyolefin and 70 to 230 g / 10 minutes of wet polyolefin. If the MI value is out of the above range, an undesired irregular fiber flow occurs, so that it is not possible to obtain an ultrafine fiber nonwoven fabric with good uniformity.

The mixing ratio of the polymer mixture or fiber mixture of the saponified ethylene-vinyl acetate copolymer and the polyurethane or polyolefin is such that the saponified ethylene-vinyl acetate copolymer is 95 to 60% by weight, and the polyurethane or polyolefin is 5 to 5% by weight. It is in the range of 40% by weight. If the amount of the ethylene-vinyl acetate copolymer is less than this range, characteristics such as hygroscopicity, affinity with a drug, and feeling cannot be obtained based on the ethylene-vinyl acetate copolymer.

Next, the melt blown spinning method of the polymer for producing the base nonwoven fabric for application is performed by spinning at a spinning temperature of 250 to 300 ° C. and a carrier gas pressure (gauge pressure) of 0.5 to 5 kg / cm ² , Ultrafine fibers having an average fiber diameter of 8 microns or less can be obtained, and a fiber stream having good uniformity can be formed. By collecting this fiber stream in a sheet form on a conveyor net, it is possible to obtain an ultrafine fiber nonwoven fabric having a wide width and good uniformity. The obtained nonwoven fabric is subjected to a treatment in which at least one surface is densified and most of the contact portions of the fibers adhere in a discontinuous pattern. That is, one surface or both surfaces of the collected ultrafine fiber nonwoven fabric are pressed or pressed with a roll or an endless belt heated to a temperature at which the fibers are softened, thereby densifying the nonwoven fabric surface and bonding the contact portions of the fibers. . It is preferable that at least one of the roll and the endless belt used for the press use a deep embossed pattern or a pinpoint embossing roll or an endless belt in terms of flexibility, texture, stretchability and the like.

In spinning the saponified ethylene-vinyl acetate copolymer of the present invention, other thermoplastic polymers, for example, polyvinyl alcohol, nylon-6, nylon-66, polyamides such as nylon-610, polyethylene terephthalate, A polymer selected from polyesters such as butylene terephthalate may be mixed. The mixing ratio of the polymer is 40 to 5% by weight. It is also possible to add and mix a pigment or a masterbatch in which the pigment is dispersed in a thermoplastic polymer in advance, or an additive for preventing the adhesive property of the fiber, such as titanium oxide or fine silicon oxide.

The basis weight of the melt-blown ultrafine fiber nonwoven fabric for application of the present invention is determined depending on the intended use.
It is in the range of 200 g / m ² .

The melt-blown ultrafine fibrous nonwoven fabric for application of the present invention has hydrophilicity and lipophilicity, good chemical resistance, excellent stretchability or extensibility, high air permeability, high moisture permeability, flexibility and skin contact. It is a base material for sticking that has an excellent touch. Furthermore, it has good drug compatibility and drug applicability.

<Examples> Next, embodiments of the present invention will be described with specific examples, but the present invention is not limited to these examples.
The parts and percentages in the examples relate to weight unless otherwise specified.

The intrinsic viscosity [η] of the polymer of the present invention is 85% phenol in the case of a saponified ethylene-vinyl acetate copolymer,
Dissolved in a mixed solvent of 15% water, and in the case of polyurethane,
It was dissolved in N, N'-dimethylformamide and measured at a temperature of 30 ° C. using a capillary viscometer, and the intrinsic viscosity [η] was determined by the following equation.

Here, t is the flow time of the solution (second) t ₀ is the flow time of the solvent (second) c is the concentration of the polymer (g /) Example 1 49 mol% of ethylene, 98 mol% of saponification degree, intrinsic viscosity [ η] = 0.062 / g of a saponified ethylene-vinyl acetate copolymer melted by an extruder, and a nozzle portion having a discharge hole having a diameter of 0.3 mm arranged in a line at 1 mm intervals in a melt blown die, and a width of 0.25 on both sides thereof a die provided with a gas for jetting slit of mm, melt spinning temperature 280 ° C., discharged at a discharge amount 0.2 g / min per hole, conveying air temperature 280 ° C., melt blown under the conditions of the air gauge pressure 1.5 kg / cm ² spun by law, spinning microfine fiber stream was installed at a position approximately 26cm from the die, and collected on the net of the belt conveyor the net trapping air traveling at a constant speed, the average basis weight 45 kg / m ² melt blown microfine A fibrous nonwoven fabric was obtained.

When this melt blown nonwoven fabric fiber was observed at a magnification of 500 times with a scanning electron microscope (hereinafter abbreviated as SEM), the average diameter of the fiber was about 4.7 microns. Also,
The ultrafine fiber nonwoven fabric had a soft texture, although in a densely integrated state.

The crimping area of this melt blown ultrafine fiber nonwoven fabric is 20
%, Line pressure 5 kg / cm, roll temperature 100 ° C, processing speed 10m / min, press processing was performed with a pinpoint embossing calender roll, and the majority of the fiber contact portions were discontinuously joined to the surface in a pinpoint pattern. . The obtained non-woven fabric has high strength, and when used as a base material for compresses, it has good stretchability, good skin contact, good touch, good compatibility with drugs, and excellent chemical resistance. Atsuta.

Comparative Example 1 A saponified ethylene-vinyl acetate copolymer having an ethylene content of 49 mol%, a degree of saponification of 98% and an intrinsic viscosity [η] of 0.092 / g was subjected to melt blown spinning using the same apparatus as in Example 1. However, sufficient spinnability was not obtained under the same conditions as in Example 1, so that the spinning temperature was 300 ° C.
The spinning was performed at a temperature of 5 ° C. and an air gauge pressure of 5 kg / cm ² . However, the melt viscosity is high, and fibers that are sufficiently thin cannot be obtained.
The thickness of the fibers was not uniform, the average diameter of even fine fibers was about 12 microns, and a very uniform flow of ultrafine fibers could not be obtained. Further, the obtained nonwoven fabric was coarse and hard, but also weak in strength and was not suitable as a base for compresses.

Example 2 Polypropylene 3 containing 37 parts of a saponified ethylene-vinyl acetate copolymer having an ethylene content of 49 mol%, a saponification degree of 98% and an intrinsic viscosity [η] of 0.062 / g, and a yellow-brown pigment of 20%.
And melt-blown spinning was performed using the same apparatus as in Example 1. The spinning was carried out under the same spinning conditions as in Example 1, but the spinning properties were good, and a melt-blown ultrafine fiber nonwoven fabric with good uniformity and an average basis weight of 85 g / m ² was obtained, which was colored to a flesh color without unevenness of color. .

When this nonwoven fabric was observed by SEM, the average fiber diameter was about 5 microns. Using an embossing roll with a deep textured engraving
Embossing was performed at 120 ° C. and a linear pressure of 3 kg / cm. The resulting microfiber nonwoven fabric has the feel and texture of a cotton-made fabric, has high elongation-cutting strength, is flexible and extensible, has good skin contact, and has no discomfort when worn. It was a sticking substrate having good applicability.

Example 3 Polymethyl 3-methyl-1,5 having an average molecular weight of 1100 obtained by condensation polymerization of 3-methyl-1,5-pentanediol and adipic acid.
-1 mol of pentane adipate glycol (46%), 4,
A composition of 4 mol of 4'-diphenylmethane diisocyanate and 3 mol of butylene glycol was polymerized by a melt polymerization method to obtain a polyurethane having an intrinsic viscosity [η] of 0.097 / g. After melt polymerization, this polyurethane was taken out as a strand and cut with a pelletizer into a pellet. 30 parts of this polyurethane pellet and 70 parts of a saponified ethylene-vinyl acetate copolymer having an ethylene content of 55 mol%, a saponification degree of 98 mol%, and an intrinsic viscosity [η] of 0.072 / g are mixed by a pellet, and mixed. The pellet is melted with an extruder, and the melt-spinning is performed using a nozzle with a 0.3 mm diameter discharge hole arranged in a line at 1 mm intervals on a melt blown die and a 0.25 mm wide gas ejection slit on both sides. Discharge at a temperature of 280 ° C and a discharge rate of 0.2 g / min per hole.
° C., was spun at a melt-blown method under the condition of the air gauge pressure 2.5 kg / cm ^2, spun microfine fiber stream is disposed at a position approximately 25cm from the die, on the net of the belt conveyor the net collector to travel at a constant speed It was collected to obtain a melt blown ultrafine fiber nonwoven fabric having an average basis weight of 95 g / m ² . The fibers of this meltblown ultrafine fiber nonwoven fabric had good uniformity, and the average fiber diameter was about 6.8 microns.

This ultra-fine fiber nonwoven fabric was calendered under the same conditions as in Example 1 to form a dense surface by fusing most of the fiber contact portions in a discontinuous pattern. This thing is rich in elasticity,
It was a flexible base material with good skin contact.

Comparative Example 2 In the melt-blown spinning of Example 3, the polyurethane was polymerized into a high-viscosity polyurethane having an intrinsic viscosity [η] of 0.16 / g, and melt-blown spinning was carried out under the same conditions as in Example 3 as a polymer mixture. However, in a short time of about 2 hours, there was no noticeable abnormality in spinnability,
If the time is longer than this, the spinnability due to the melt blown will rapidly decrease, thread breakage will occur frequently, and the cut fiber pieces to which unmelted particles have adhered will be mixed in the nonwoven fabric, making it impossible to stably spin and sticking. It is not a nonwoven fabric that can be used as a base material.

Example 4 Ethylene 1-octene copolymer having MI = 205 (Polymer A) and ethylene-vinyl acetate copolymer having an ethylene content of 58 mol%, a saponification degree of 95% and an intrinsic viscosity [η] of 0.060 / g The saponified product (Polymer B) was melted with a separate extruder, and the same melt blown machine used in Example 1 was used to spin at 285 ° C., at 300 ° C., and at 2 k air pressure.
g / cm ² , and the spun ultrafine fiber stream is polymer A
The fiber stream of 35 parts and the fiber stream of the polymer B are combined at a ratio of 65 parts, and collected on a net of the same collector to obtain a melt-blown ultrafine fiber nonwoven fabric having an average basis weight of 75 g / m ^2. I got One surface of this nonwoven fabric was embossed with a pinpoint embossing roll heated to 135 ° C., and the fibers were partially adhered in a pattern. The obtained ultrafine fiber nonwoven fabric had elasticity, was soft and had good skin contact properties, had good adhesive properties, and was suitable as a patch.

<Effect of the Invention> The melt-blown ultrafine fiber nonwoven fabric of the present invention has high elongation-cutting strength, is flexible, has excellent stretchability or elongation, has good skin contact, has high air permeability, high moisture permeability, and has hydrophilicity and lipophilicity. It is a base material for application which is resistant to chemicals and has good applicability of chemicals.

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Claims (7)

(57) [Claims] 1. An average fiber diameter of 8 μm or less which is a polymer mainly composed of a saponified ethylene-vinyl acetate copolymer having an ethylene content of 40 to 60 mol% and an intrinsic viscosity [η] of 0.055 to 0.085 / g. A base material for application comprising at least one surface of a melt-blown ultrafine fiber nonwoven fabric, wherein at least one surface is a surface to which most of the contact portions of the fibers are adhered in a discontinuous pattern. 2. A polymer mainly composed of saponified ethylene-vinyl acetate copolymer having an ethylene content of 40 to 60 mol% and an intrinsic viscosity [η] of 0.055 to 0.085 / g; It has a segment content of 45 to 75% by weight and an intrinsic viscosity [η] of a chain extender mainly composed of diol of 0.05 to 0.05%.
Polyurethane-based polymer at ~ 0.10 / g
It is composed of a melt-blown microfiber nonwoven fabric having an average fiber diameter of 8 μm or less composed of 40% by weight of mixed spun fibers, and at least one surface is a surface where most of the contact portions of the fibers are bonded in a discontinuous pattern. Substrate for application. 3. A polymer mainly composed of saponified ethylene-vinyl acetate copolymer having an ethylene content of 40 to 60 mol% and an intrinsic viscosity [η] of 0.055 to 0.085 / g, and polyolefin. It is composed of a melt-blown ultrafine fiber nonwoven fabric having an average fiber diameter of 8 μm or less composed of 5 to 40% by weight of mixed spun fibers, and at least one surface is a surface to which most of the contact portions of the fibers are adhered in a discontinuous pattern. Base material for application. 4. An average fiber diameter of not more than 8 microns comprising a polymer mainly composed of a saponified ethylene-vinyl acetate copolymer having an ethylene content of 40 to 60 mol% and an intrinsic viscosity [η] of 0.055 to 0.085 / g. 95 to 60% by weight of melt-blown ultrafine fibers and 5 to 40% by weight of melt-blown ultrafine fibers composed of polyolefin and having an average fiber diameter of 8 microns or less. A base material for application, characterized in that most of the parts are adhered surfaces. 5. A polymer mainly composed of a saponified ethylene-vinyl acetate copolymer having an ethylene content of 40 to 60 mol% and an intrinsic viscosity [η] of 0.055 to 0.085 / g is melted and spun by a melt blown method. To form an ultrafine fiber stream having an average fiber diameter of 8 μm or less, and collect the fiber stream into a sheet to form an ultrafine fiber non-woven fabric; A method for producing a base material for application, characterized by performing a treatment for bonding. 6. A polymer mainly composed of a saponified ethylene-vinyl acetate copolymer having an ethylene content of 40 to 60 mol% and an intrinsic viscosity [η] of 0.055 to 0.085 / g; It has a segment content of 45 to 75% by weight and an intrinsic viscosity [η] of a chain extender mainly composed of diol of 0.06.
5 to 40% by weight of a polymer selected from a polyurethane-based polymer or a polyolefin having a weight of about 0.12 / g is melted and spun by a melt blown method to form an ultrafine fiber stream having an average fiber diameter of 8 microns or less. And applying a treatment in which the fiber stream is collected in a sheet shape to form a microfiber nonwoven fabric, and at least one surface is subjected to a treatment for densifying and bonding most of the contact portions of the fibers in a discontinuous pattern. Method of manufacturing base material. 7. A polymer mainly composed of a saponified ethylene-vinyl acetate copolymer having an ethylene content of 40 to 60 mol% and an intrinsic viscosity [η] of 0.055 to 0.085 / g is melted and spun by a melt blown method. To form a microfiber stream I having an average fiber diameter of 8 μm or less, while a polymer selected from polyolefin is melted and spun by a melt blown method to form an ultrafine fiber stream II having an average fiber diameter of 8 μm or less. The fiber streams I and II are mixed in a weight ratio of the fiber stream I in the range of 95 to 60% by weight and the fiber stream II in the range of 5 to 40% by weight, and collected into a sheet to form an ultrafine fiber mixed nonwoven fabric. A method for producing a base material for application, comprising performing treatment for densifying at least one surface and bonding most of the contact portions of the fibers in a discontinuous pattern.