JPH02264057A - Nonwoven fabric and production thereof - Google Patents

Abstract

PURPOSE:To obtain a new ultrafine fiber combined filament nonwoven fabric having moisture absorptivity, hydrophilicity, lipophilicity and elasticity by combining saponified ethylene-vinyl acetate copolymer-based ultrafine fiber streams with polyurethane-based ultrafine fiber streams at a specific ratio and collecting the combined streams in the form of a sheet. CONSTITUTION:A polymer consisting essentially of saponified ethylene-vinyl acetate copolymer with 40-60mol% ethylene content and 0.055-0.085l/g intrinsic viscosity [eta] is melted and spun by a melt blowing spinning method to form ultrafine fiber streams (A) having $8mu average fiber diameter. On the other band, a polymer consisting essentially of a polyurethane with 45-75wt.% soft segment content, prepared by using a chain extender consisting essentially of a diol and having 0. 05-0.10l/g intrinsic viscosity [eta] is melted and spun by a melt blowing spinning method to form ultrafine fiber streams (B) having <=8mu average fiber diameter. The above-mentioned fiber streams (A) and (B) are combined so as to provide 95-30wt.% fiber streams (A) and 5-70wt.% fiber streams (B) and the combined streams are collected into the form of a sheet to afford the objective nonwoven fabric.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application> The present invention relates to a novel elastic non-woven fabric.

<Prior Art> Conventionally, many proposals have been made for melt-prone ultrafine fiber nonwoven fabrics made by the melt-prone spinning method, and these nonwoven fabrics are being used for various purposes.

For example, regarding polyurethane elastic fiber nonwoven fabrics, when producing polyurethane elastic fiber nonwoven fabrics using a thermoplastic polyurethane elastic body by the melt-prone method, it is recommended to add a polyisocyanate compound to the polyurethane elastic body, as described in Japanese Patent Publication No. 8746/1987, 64-8747 discloses that a reticulated sheet is manufactured by heating and pressurizing a nonwoven fabric made of an ether-based thermoplastic polyurethane elastic body with an emboss roll and an elastic roll.
This is proposed in Japanese Patent No. 282362. On the other hand, Japanese Patent Publication No. 64-8724 discloses that polyurethane elastic fiber non-woven fabric obtained by the melt-prone method is used for gloves, and the present inventors also reported that polyurethane elastic fiber non-woven fabric obtained by the melt-prone method using polyurethane with a specific composition. JP-A-64-40655 proposes an attached cloth which is laminated with a cloth-like material.

<Problems to be Solved by the Invention> The polyurethane elastic fiber nonwoven fabric obtained by the conventional melt-prone spinning method is flexible and highly elastic, whereas the fibers made of saponified ethylene-vinyl acetate copolymer are hygroscopic. It has low triboelectrification, high Young's modulus, and is excellent for clothing.However, nonwoven fabrics made from this fiber have a firm texture, and they are unique in that they take advantage of their respective characteristics. Applications are being expanded.

However, by modifying conventional saponified polyurethane or ethylene-vinyl acetate copolymers, or by spinning a mixture of these polymers, it is difficult to produce nonwoven fabrics that take advantage of the physical properties of each polymer. .

In addition, in the saponified ethylene-vinyl acetate copolymer and polyurethane used in conventional melt spinning, the melt extrudate is formed into a fiber stream with a high-pressure gas jet stream, which is then conveyed and collected in a sheet form to create a nonwoven fabric. When manufacturing nonwoven fabrics using the melt-prone method, it is not possible to form a fiber flow with good uniformity, so it is not possible to obtain sufficiently thinned and oriented fibers, resulting in non-uniform fiber thickness and fiber length. Therefore, it is not possible to obtain a nonwoven fabric with good texture. In particular, the melt-prone method has a width of 1 m.
It is difficult to make a melt-prone nonwoven fabric with good uniformity from a nonwoven fabric with a width exceeding 1.

The present invention provides a novel nonwoven fabric that is flexible, stretchable, hygroscopic, wettable, and oleophilic, and is suitable for a wide range of application orientations.
It is provided as a wide-width melt-prown microfiber nonwoven fabric with good uniformity.

Means for Solving the Problems> The present invention mainly uses a saponified ethylene-vinyl acetate copolymer having an ethylene content of 40 to 60 mol% and an intrinsic viscosity [η] of 0.055 to 0.0852/g. 95 to 30% by weight of melt-prone ultrafine fibers with an average fiber diameter of 8 microns or less, and a soft segment content of 45% by weight.
~75% by weight, and has an intrinsic viscosity [ma] of 0.05 to 0.1 OL'gj, which is composed of a chain extender mainly composed of diol.
: Melt-prone ultrafine fibers 115 to 7 with an average fiber diameter of 8 microns or less made of a certain polyurethane-based polymer
This nonwoven fabric is characterized by being a nonwoven fabric containing 0% by weight of ultrafine fibers.

Further, the present invention provides an average fiber made 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 of 0.055 to 0.085 g/g. Melt-prone ultrafine fibers with a diameter of 8 microns or less, 95 to 30% by weight, soft segment content of 45 to 75% by weight, and an intrinsic viscosity [ma] of 0.05 to 0, consisting of a chain extender mainly composed of diol. .10Q/g
Melt-prone ultrafine fibers with an average fiber diameter of 8 microns or less made of a polyurethane-based polymer 5 to 70
This nonwoven fabric is composed of a nonwoven fabric mixed with ultrafine fibers of % by weight, and is characterized in that at least one surface is a surface where most of the fiber contact areas are adhered to one side or in a pattern.

Furthermore, 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 of 0.055 to 0.085 L'g, The melt-prone spinning method is used to form ultrafine fiber stream I with an average fiber diameter of 8 microns or less, while the soft segment content is 45 to 75% by weight, and the intrinsic viscosity is composed of a chain extender mainly composed of diol. [η] is 0.05
~0. IQ/g of a polymer mainly composed of polyurethane is melted and spun using a melt-prone spinning method to form an ultrafine fiber stream II with an average fiber diameter of 8 microns or less, and the fiber streams I and II are divided into fibers by weight ratio. Stream I is mixed with ultrafine fibers in a range of 95 to 30% by weight and fiber stream II is mixed in a range of 5 to 70% by weight, collected in a sheet form to obtain an ultrafine fiber-mixed nonwoven fabric, and if necessary, at least one side of the nonwoven fabric. This is a method for producing a nonwoven fabric, which is characterized by carrying out a treatment in which the fibers are densified and most of the contact areas of the fibers are adhered to one side or in a pattern.

The ultrafine fiber mixed fiber nonwoven fabric of the present invention, which is a mixture of ultrafine fibers made of a saponified ethylene-vinyl acetate copolymer and ultrafine fibers made of a polymer mainly made of polyurethane, is made of A method of making an ultrafine fiber-mixed nonwoven fabric by mixing ultrafine fibers obtained by spinning with a spinning die in a fiber stream, during collection, or on a collection sheet; The melt of each polymer is discharged from two systems of nozzles arranged in a shape and spun into ultrafine fibers, and the ultrafine fibers form a mixed ultrafine fiber stream. It can be produced by collecting the mixed ultrafine fiber stream in a sheet form to produce a nonwoven fabric mixed with ultrafine fibers.

That is, the nonwoven fabric of the present invention uses a saponified ethylene-vinyl acetate copolymer and polyurethane having specific physical properties to form melt-prone ultrafine fibers with good uniformity, and has elastic behavior in which the ultrafine fibers are mixed. The objective is to produce a nonwoven fabric with less uneven mechanical properties.

The saponified ethylene-vinyl acetate copolymer used in the present invention has an ethylene content in the range of 40 to 60 mol%,
The intrinsic viscosity measured as a solution of the polymer is 0.05
5 to 0.085 ff/g. The ethylene content of this polymer is 40 mol%
If it is less than 20%, the thermal stability of the polymer will deteriorate, the melt viscosity will increase, and infusible matter (gel-like matter) will be generated, making stable melt-prone spinning impossible, resulting in poor fiber flow. may not be formed, or a large amount of particulate matter such as undissolved particulate matter may be mixed into the nonwoven fabric. On the other hand, the ethylene content is 60
When the amount exceeds mol%, the rigidity, tensile properties, dyeability, moisture absorption, and heat resistance characteristic of polyvinyl alcohol decrease, and the nonwoven fabric becomes undesirably polyolefin-like or wax-like in feel. Also, the intrinsic viscosity of the polymer [η
] is outside the range of 0.055 to 0.085 L'g and the intrinsic viscosity [1] is small, the melt viscosity is small and sufficient stringability cannot be obtained, resulting in a sufficiently thin and good fiber flow. As a result, it is not possible to obtain a nonwoven fabric with good uniformity, a large number of minute beads are mixed into the nonwoven fabric, the strength of the nonwoven fabric is low, it loses its elasticity, and its heat resistance decreases. This results in an undesirable non-woven fabric. On the other hand, if the intrinsic viscosity (v) exceeds 0.085 l/g and the viscosity becomes high, the melt-prone method will not be able to form a fiber flow of sufficiently thinned and oriented fibers. It is not possible to obtain a nonwoven fabric, and the obtained nonwoven fabric is weak in strength and has a rough and hard texture. Furthermore, the degree of oxidation of vinyl acetate is 80 mol% or more, preferably 90 mol% or more. As the degree of saponification increases, the performance of the fibers such as hygroscopicity and heat resistance improves, resulting in a nonwoven fabric with a good texture.

Furthermore, the polyurethane used in the present invention has an average molecular weight of 5
00 to 3000 polymer diols, for example, at least one selected from the group of polyester diols, polyether diols, polyester ether diols, polycaprolactone diols, polycarbonate diols, etc.
types of polymer diols and organic polyisocyanates,
For example, at least one selected from the group of aromatic diisocyanates such as tolylene diisocyanate, xylylene diisocyanate, diphenylmethane diisocyanate, hydrogenated diphenylmethane diisocyanate, and isophorone diisocyanate, aliphatic diisocyanates having a cyclic group, and alicyclic diisocyanates. A type of organic diisocyanate is reacted with a low molecular weight compound having at least two active hydrogen atoms as a chain extender and having a molecular weight of 400 or less, for example, at least one type of compound selected from the group of diols, amino alcohols, diamines, etc. This is polyurethane obtained by In addition, as a preferable soft segment to obtain more flexibility and stretchability, the composition of the polymer diol is such that at least 40% by weight of the diol is polymerized from an aliphatic diol having a side chain of 5 to 1 carbon atoms and a dicarboxylic acid. It is a polymer diol mainly composed of a polyester diol having an average molecular weight of 500 to 3000, and the chain extender is a chain extender mainly composed of a low molecular weight diol. The method for producing polyurethane is to select a polymer diol, an organic diisocyanate, and a chain extender in a desired composition ratio, and polymerize it by a melt polymerization method, a bulk polymerization method, a solution polymerization method, or the like to obtain a polyurethane. In addition, the uniformity is good,
In order to obtain a nonwoven fabric with good elastic behavior, the content of polymer diol, which becomes a soft segment, should be 45 to 75% by weight in the composition during polyurethane production, and the chain extender should contain a chain extender mainly composed of diol. Polymerize. In the case of polyurethane that is used in the form of pellets,
Considering the decrease in viscosity during melt spinning of polyurethane, the intrinsic viscosity [η] after pelletizing is 0.06 to 0. Polymerization is performed to obtain a higher viscosity within the range of 1/g. In addition, when polymerizing by the melt polymerization method and producing ultrafine fibers directly by the melt-prone spinning method without pelletizing, there is no need to take into account the decrease in viscosity during spinning, so the intrinsic viscosity after spinning is reduced. is adjusted by polymerization to a range of 0.05 to 0.10 (1/gf). In addition, the soft segment content in polyurethane is in the range of 45 to 75% by weight, and if the soft segment content is less than 45% by weight,
Although it is good in terms of spinnability and ultra-fine fiber formation, it is difficult to soften the nonwoven fabric,
It is unfavorable in terms of elasticity, stability of form, smoothness of the surface, adhesion to the skin, adhesion to shape, etc. On the other hand, if the soft segment content exceeds 75% by weight, the nonwoven fabric will have good flexibility, but the spinnability and formation of ultrafine fibers will deteriorate, making it impossible to obtain an ultrafine fiber nonwoven fabric with good texture.

Furthermore, if the intrinsic viscosity of the polyurethane is small, sufficiently fine fibers cannot be obtained, and a nonwoven fabric with fibers of non-uniform thickness will result. Furthermore, if the intrinsic viscosity (wa) of the polyurethane is high, the melt viscosity will be high, making it impossible to form a good fiber flow of ultrafine fibers.

In the present invention, the ultrafine fibers of a saponified ethylene-vinyl acetate copolymer and the ultrafine fibers of polyurethane are mixed to form an ultrafine fiber mixed nonwoven fabric. The blending ratio varies depending on the intended use, but is generally in the range of 95 to 30% by weight of ultrafine fibers of saponified ethylene-vinyl acetate copolymer and 5 to 70% by weight of ultrafine fibers of polyurethane. If you want hygroscopicity, dyeability, rigidity (stiffness), etc., increase the fiber amount of saponified ethylene-vinyl acetate copolymer, and if you want elasticity, flexibility, added properties, etc., increase the fiber amount of polyurethane. increase.

Next, in the melt-prone spinning method of polymers for producing microfiber nonwoven fabrics, the average Ultrafine fibers with a fiber diameter of 8 microns or less can be obtained, and a fiber flow with good uniformity can be formed. The method of producing the ultrafine fiber mixed nonwoven fabric in the present invention is as follows: (1) Melt the saponified ethylene-vinyl acetate copolymer and polyurethane in separate melt systems, and spin them using respective melt-prone spinning dies to obtain the respective ultrafine fibers. The ultrafine fiber streams are combined to form a single ultrafine fiber mixed stream, which is then collected in a sheet form by a conveyor net type collector or drum type collector, or each ultrafine fiber stream is A microfiber-mixed nonwoven fabric is produced by mixing the fibers on a collector. ■ Two systems of nozzles are installed alternately or in blocks on the same melt-prone spinning die,
Each polymer is melted in a separate melting system, and the melt is fed to each system and spun to form ultrafine fibers, which are mixed into an ultrafine fiber stream and sent to a collector in the form of a sheet. A nonwoven fabric containing ultrafine fibers is produced by collecting the ultrafine fibers. Thereby, it is possible to obtain an ultrafine fiber mixed nonwoven fabric with good uniformity even if it has a wide width. The obtained nonwoven fabric is subjected to a treatment such that at least one side thereof is densified and most of the fiber contact areas are bonded to one side or in a pattern. That is, one or both sides of the collected ultrafine fiber nonwoven fabric is pressed with a press roll or an endless belt heated to a temperature that softens the fibers, thereby making the surface of the nonwoven fabric dense and bonding the contact areas of the fibers.

In addition, it is preferable to use an embossed roll or endless belt with a deep uneven pattern or bin points as at least one of the rolls and endless belt used in the press in terms of flexibility, texture, elasticity, etc.

In addition, when spinning the saponified ethylene-vinyl acetate copolymer and/or polyurethane of the present invention, other thermoplastic polymers, such as polyethylene, ethylene propylene copolymer, ethylene butene copolymer, ethylene octene copolymer, etc. Polymers selected from polyolefins such as polypropylene, polybutene, polyvinyl alcohol, polyamides such as nylon-6, nylon-66, and nylon-610, and polyesters such as polyethylene terephthalate and polybutylene ethylene phthalate may be mixed. The mixing ratio of the polymer is 40 to 5% by weight. Also,
It is also possible to add and mix a pigment or a masterbatch in which the pigment is previously dispersed in a thermoplastic polymer, and additives for preventing fiber stickiness, such as titanium oxide and fine silicon oxide.

The basis weight of the melt-prown microfiber nonwoven fabric of the present invention is determined depending on the intended use, but is generally 30 to 50.
0g/m'' range.

The melt-prone microfiber mixed nonwoven fabric of the present invention has hygroscopicity, hydrophilicity, and lipophilicity, good chemical resistance, excellent elasticity or extensibility, and high air permeability and moisture permeability.
It is a flexible nonwoven fabric with excellent skin adhesion, shaping ability, and feel, and by changing the blending ratio of fibers, nonwoven fabrics with a wide range of textures and textures can be obtained. This nonwoven fabric can be used alone for medical purposes, clothing, batting, etc., but it can also be impregnated with resin and/or coated to be used as a base material for leather-like sheets. Furthermore, the nonwoven fabric of the present invention can be used as a laminate in which the fibers are entangled or bonded with nonwoven fabrics or knitted fabrics made of other fibers for clothing or industrial materials.

<Examples> Next, embodiments of the present invention will be described using specific examples, but the present invention is not limited to these examples. Note that parts and percentages in the examples are by weight unless otherwise specified.

Further, the intrinsic viscosity (1) of the polymer of the present invention is ethylene-
In the case of saponified vinyl acetate copolymer, phenol 85%,
Dissolved in a mixed solvent containing 15% water, or in the case of polyurethane, dissolved in N,N'-dimethylformamide, measured using a capillary viscometer at a temperature of 30°C, and determined the intrinsic viscosity [1] using the following formula. Ta.

v, e-(t-to)/lo-(t/1o)-1 [ri]
-! i ■ Way/C where t is the solution flow time (seconds) to is the solvent flow time (seconds) C is the concentration of the polymer 2 (g/α) Example 1 Ethylene content 45 mol%, saponification degree 98 A saponified ethylene-vinyl acetate copolymer with mole% and intrinsic viscosity (v) = 0.062 l/g was melted with an extruder, and a diameter of 0.3
Using a melt spinning die with a nozzle part in which av+ discharge holes were arranged in a row at intervals of i n + m and gas jetting slits with a width of 0 to 25 mm on both sides, the melt spinning temperature was 280 °C, and the discharge amount per hole was used. Discharge at 0.2g/min,
Conveying air temperature 280℃, air gauge pressure 1, 5 kg/
cm" by the melt-prone method to form a melt-prone ultrafine fiber stream (1). Poly 3-methyl 1,5-pentane adipate glycol 1 mole (54%), 4.4
A composition of 4 moles of '-diphenylmethane diisocyanate and 3 moles of butylene glycol was polymerized by a melt polymerization method to obtain a polyurethane having an intrinsic viscosity of [ma].O and 104 ff/g. After melt polymerization, this polyurethane was taken out as a strand and cut with a pelletizer to form pellets. These polyurethane pellets were spun using the same melt proning device under the conditions of a spinning temperature of 285°C, a conveying air temperature of 290°C, and an air gauge pressure of 2.5 kg/c, with the polyurethane discharge rate adjusted by controlling the metering gear pump. , a melt-prone microfiber stream (II) was formed. The spun ultrafine fiber stream is mixed in a predetermined amount to form an ultrafine fiber mixed stream, and then collected on the net of a belt conveyor net collection machine that is installed at a position approximately 25 cm from the guide and runs at a constant speed. As a result, a melt-prone ultrafine fiber mixed nonwoven fabric with an average basis weight of 105 g/m'' was obtained. Although this ultrafine fiber mixed nonwoven fabric was in a dense accumulation state, it had a soft texture.

When this melt-prown nonwoven fabric fiber was observed with a scanning electron microscope (hereinafter abbreviated as SEM) at a magnification of 500 times, the average diameter of the nonwoven fabric constituent fibers was approximately 4.5 microns for the ultrafine fibers (CI), and approximately 4.5 microns for the ultrafine fibers (I). [) was approximately 6.6 microns.

The area of the crimped part on this melt-prone microfiber mixed nonwoven fabric is 2.
0%, a linear pressure of 5 Kg/cm, a roll temperature of 100° C., and a processing speed of 10 m/min to bond most of the fibers on the surface. The obtained nonwoven fabric had high strength, extensibility, good form conformability, high air permeability and moisture permeability, good feel to the touch, and excellent chemical resistance.

Next, Table 1 shows the relationship between melt-prone ultrafine fiber blending ratio, texture, and usage.

Table 1 below: By changing the blending ratio of ultrafine fibers, nonwoven fabrics suitable for various uses can be obtained.

Comparative Example 1 In the production of the melt-prone ultrafine fiber mixed nonwoven fabric of Example 1, the saponified ethylene-vinyl acetate copolymer was used with an ethylene content of 49 mol%, a degree of saponification of 98%, and an intrinsic viscosity of (7)-
Melt prone spinning was carried out in the same manner as in Example 1, except that the saponified ethylene-vinyl acetate copolymer was used at 0,092 Q/g. However, sufficient spinnability could not be obtained under the same conditions as in Example 1, so the spinning temperature was set at 300°C and the conveying air temperature was set at 30°C.
Spinning was carried out at 0° C. and at an air gauge pressure of 5 kg/c×8. However, due to the high melt viscosity, it was not possible to obtain sufficiently fine fibers, the thickness of the fibers was uneven, and even thin fibers had an average diameter of about 1 micron, and it was not possible to obtain a highly uniform ultrafine fiber flow. Ta. In addition, the obtained nonwoven fabric was coarse and hard, and its strength was weak.

Comparative Example 2 In the production of the melt-prone ultrafine fiber mixed nonwoven fabric of Example 1, the intrinsic viscosity of polyurethane [l] -0,161/
When melt-prone spinning was performed under the same conditions as in Example 1 by replacing the high-viscosity polyurethane (g) with polyurethane, there was no abnormality in the spinnability for a short time of about 2 hours, but when the time was longer than that, the melt-prone spinning The spinnability of the yarn rapidly deteriorates, yarn breakage occurs frequently, and cut fiber pieces with undissolved particles adhering to them become mixed in the flow of melt-prone ultrafine fibers, making stable spinning impossible, making the nonwoven fabric unusable. Ta.

Example 2 Ethylene content 49 mol%, degree of saponification 98%, intrinsic viscosity (
v ) = 0.062 (93 parts of saponified ethylene-vinyl acetate copolymer (1/g) and 7 parts of polypropylene containing 20% yellow-brown pigment were kneaded and spun using the same equipment as in Example 1 under the same spinning conditions. Melt prone ultrafine fiber stream (III) was formed by melt prone spinning.Meanwhile, 1 mol (55%) of polyethylene adipate glycol having an average molecular weight of 2000, 5 mol% of 4.4'-diphenylmethane diisocyanate, and butylene glycol. Intrinsic viscosity (Cv) obtained by polymerization using a melt polymerization method with a composition of 4 mol% = 0.
92 l parts g of 95 parts of polyurethane and 20 parts of yellow-brown pigment.
5 parts of polypropylene containing
, conveying air temperature 290℃, air gauge pressure 2Kg/Cm
The spinning was carried out under the conditions of ``melt prone ultrafine fiber flow (
IV) was formed.

Each melt-prone ultrafine fiber stream is made into an ultra-fine fiber mixed flow containing 55 parts of the fiber stream (DI) and 45 parts of the fiber stream (IV), and is collected in a sheet form on a collector to become the melt-prone ultrafine fiber mixture. A nonwoven fabric was obtained. This nonwoven fabric was a melt-prone ultrafine fiber mixed nonwoven fabric with good uniformity and an average basis weight of 85 g/m'', which was colored in flesh color without any color shading.

When this nonwoven fabric was observed with a SEM, the average diameter of the fibers was about 5 to 6 microns, and this ultrafine fiber mixed nonwoven fabric was elastic and had the feel and feel of a fabric made of cotton.

Embossing was carried out on this ultrafine fiber mixed nonwoven fabric using an embossing roll with deep texture engravings at a roll temperature of 10° C. and a line pressure of 3 Kg/Cm.

The obtained nonwoven fabric had high stretching and cutting strength, was flexible and extensible, had good skin adhesion, and was a base material for application that did not feel uncomfortable when worn.

Example 3 One melt-prone spinning die was provided with two melt supply systems, and spinning was carried out using a spinning die in which discharge holes each having a diameter of 0.31III11 for discharging the respective melts were arranged alternately. Temperature 280℃, conveying air temperature 290℃
, air gauge pressure 2-OKg/cm'', the mixing ratio of the polymers was adjusted by controlling the supply gear pump of each molten polymer, and the ethylene-vinyl acetate copolymer used in Example 1 was saponified. material (A) and polyurethane (B
) were melted in separate melting systems, and the respective molten polymers were fed to each system at a ratio of (A):(B') of 60:40 for spinning.

The spun ultrafine fiber flow is collected on the net of a belt conveyor net collection machine installed at a position approximately 25 cm from the die and running at a constant speed, and a melt-prone ultrafine fiber mixed nonwoven fabric with an average basis weight of 75 g/+o'' is produced. This ultrafine fiber-mixed nonwoven fabric was in a highly uniform mixed fiber state and had a stretchable and soft texture.

<Effects of the Invention> The melt-prone ultrafine fiber blended nonwoven fabric of the present invention has high stretch-cutting strength, is flexible, has excellent elasticity or extensibility, has high air permeability and moisture permeability, and has hygroscopicity, hydrophilicity, lipophilicity, and resistance. Nonwoven fabrics are chemical-resistant, heat-resistant, and have good adhesion to the skin, and have a wide range of textures and textures by changing the blending ratio of fibers. This non-woven fabric can be used alone for clothing,
It can be used for medical purposes and as batting, but it can also be used as a base material for leather-like sheets by impregnating and/or coating with resin.

Patent applicant RiRashi Co., Ltd.

Claims (4)

[Claims] (1) Ethylene content 40-60 mol%, intrinsic viscosity [
Ethylene with a η] of 0.055 to 0.085 l/g
Melt-prone ultrafine fibers with an average fiber diameter of 8 microns or less made of a polymer mainly composed of saponified vinyl acetate copolymer 9
5-30% by weight, and soft segment content 45-30% by weight.
75% by weight, an average fiber diameter of 8 which is made of a polyurethane-based polymer with an intrinsic viscosity [η] of 0.05 to 0.10 l/g and is made of a chain extender based on a diol.
5-70% by weight of melt-prone ultrafine fibers below microns
A nonwoven fabric characterized by being a nonwoven fabric made of ultrafine fibers. (2) At least one side of the ultrafine fiber mixed nonwoven fabric is composed of melt-prone ultrafine fibers made of a saponified ethylene-vinyl acetate copolymer and melt-prone ultrafine fibers made of a polyurethane-based polymer. 2. The nonwoven fabric according to claim 1, wherein most of the contact portions of the fibers are bonded surfaces. (3) Ethylene content 40-60 mol%, intrinsic viscosity [
Ethylene with a η] of 0.055 to 0.085 l/g
A polymer mainly composed of a saponified vinyl acetate copolymer is melted and spun using a melt-prone spinning method to form an ultrafine fiber stream I with an average fiber diameter of 8 microns or less, while a soft segment content of 45 to 75% by weight. %, and the intrinsic viscosity [η] of the chain extender mainly composed of diol is 0.05 to 0.
．． A polymer mainly composed of polyurethane at 10 l/g is melted and spun using a melt-prone spinning method to form an ultrafine fiber stream II with an average fiber diameter of 8 microns or less, and the fiber stream I
and II in a weight ratio of 95 to 30% by weight of fiber stream I and 5 to 70% by weight of fiber stream II, collected in a sheet form to make an ultrafine fiber mixed nonwoven fabric, and then 1. A method for producing a nonwoven fabric, which comprises densifying at least one side of the nonwoven fabric and adhering most of the fiber contact areas to one side or in a pattern. (4) A mixture of ultrafine fiber stream I of a polymer mainly composed of a saponified ethylene-vinyl acetate copolymer and ultrafine fiber stream II of a polymer mainly composed of polyurethane is provided in the same spinning die. 4. The method for producing a nonwoven fabric according to claim 3, wherein the fibers are mixed with ultrafine fiber streams discharged from two nozzles.