JPH0411061A - Stretchable nonwoven fabric and production thereof - Google Patents

Abstract

PURPOSE:To stably obtain the title nonwoven fabric having excellent hot water resistance and light resistance, etc., and having soft handle by spinning a polyurethane consisting of an organic diisocyanate, specific aliphatic copolycarbonate polyol and chain extender. CONSTITUTION:A polyurethane consisting of (A) an organic diisocyanate, (B) aliphatic copolycarbonate polyol having formula I to formula III as recurring units, being 1/9 to 9/1 in the ratio of the formula I to formula II and expressed by the equation formula III/ (formula I + formula II) = (3/97) to (50/50) in the ratio of formula I to formula III and (c) chain extender having two active hydrogens capable of reacting with the isocyanate is spun by a melt blow method to provide the aimed nonwoven fabric.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a stretchable nonwoven fabric and a method for producing the same.

More specifically, it is made mainly from aliphatic copolycarbonate polyol-based polyurethane having rubber elasticity, and has particularly excellent hot water resistance, light resistance, and heat resistance, and good elongation recovery property and chemical resistance (especially dry cleaning resistance). Moreover, the present invention relates to a stretchable nonwoven fabric having a soft texture and a method for manufacturing the same.

Such stretchable nonwoven fabrics can be used as batting for clothing, poultice materials, Supporter 1 elastic tape, interlining, opening parts of clothing, bandages,
Useful for diapers, gloves, hats, surgical gowns, etc.

[Conventional technology] Nonwoven fabrics made of various synthetic fibers are known.

Nonwoven fabrics obtained by spinning thermoplastic resins in these nonwoven fabrics by melt blowing are also known.

Regarding the spinning method using the melt blow method, please refer to the Industrial and Engineering Chemistry (Industrial and Engineering Chemistry)
Industrial and Engineering
g Chemistry) Volume 48, No. 8 (p, 134
2-1346) The basic apparatus and method were disclosed in 1956.

Furthermore, the following nonwoven fabrics are known as stretchable nonwoven fabrics obtained by melt blowing polyurethane.

That is, JP-A-59-223347 discloses a melt-blown nonwoven fabric made of polyurethane elastic filaments.

JP-A-1-132858 discloses a melt-blown nonwoven fabric made of polyurethane using polyester diol.

[Problem to be solved by the invention]

The melt-blown non-woven fabric disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 59-223347 is composed of filaments, so the fiber diameter is thicker than that of a melt-blown non-woven fabric, and the fabric lacks a particularly soft touch. The lower right column of page 2 of the publication describes polyols as known polyurethanes as ``for example, dihydroxy polyether, dihydroxy polyester, dihydroxy polycarbonate, dihydroxy polyester amide, etc.'', but the aliphatic copolycarbonate polyol of the present invention is described. Moreover, polyurethane melt-blown nonwoven fabrics made of dihydroxypolycarbonate not only had a hard texture, but also were difficult to make into nonwoven fabrics.

Furthermore, the melt-blown nonwoven fabric disclosed in JP-A-1-132858 uses polyester diol,
Although hydrolysis resistance has been improved, dry cleaning resistance and light resistance are poor.

The characteristics of polyurethane molding materials currently on the market are as follows:
Much depends on the high molecular weight polyol used as the raw material for polyurethane.
According to page 139 (published by MC), when polyester polyol is used, water resistance is poor, but mechanical strength and heat resistance are relatively good.

On the other hand, when polyether polyol is used, water resistance is improved, but heat resistance and mechanical strength are inferior. Poly-ε-caprolactone polyol has mechanical properties, heat resistance, cold resistance,
However, it has poor water resistance. Aliphatic copolycarbonate polyols have excellent water resistance, mechanical properties, and heat resistance, but are poor in cold resistance. Therefore, if the cold resistance of polyurethane using an aliphatic copolycarbonate polyol is improved, we can expect a polyurethane nonwoven fabric that is non-yellowing, has excellent cold resistance, and has well-balanced other physical properties compared to current commercially available products.

Regarding this, the same applicant as the present invention has filed Japanese Patent Application No. 126610.
7, we proposed a stretchable nonwoven fabric made of aliphatic copolycarbonate polyol-based polyurethane.

However, when using this polyurethane, the average fibers of the obtained nonwoven fabric could not be made sufficiently thin due to its high melt viscosity.

The purpose of the present invention is to provide a method that has excellent hot water resistance, light resistance, and heat resistance, and has excellent elongation recovery without the lack of soft touch, dry cleaning resistance, and light resistance that are found in the above-mentioned conventional techniques. An object of the present invention is to provide a stretchable nonwoven fabric having a sufficiently fine average fineness and made of an aliphatic copolycarbonate polyol-based polyurethane having good properties, chemical resistance, and electrical insulation properties and a particularly soft feel.

Still another object of the present invention is to provide a method for producing a stretchable nonwoven fabric having an excellent and sufficiently fine average fineness, which comprises a melt blowing method of an aliphatic copolycarbonate polyol-based polyurethane composition.

[Means to solve the problem]

According to the present invention, the above object is to provide a polyurethane comprising an organic diisocyanate, an aliphatic copolycarbonate polyol, and a chain extender having two active hydrogens capable of reacting with the isocyanate, in which the aliphatic copolycarbonate polyol has repeating units. As, (A) +0-(C)12), -0-C+(B)+M
Hz) so-c± lh, the ratio of A and B is 1/9 to 9/1,
This is achieved by a stretchable nonwoven fabric characterized in that it is mainly composed of thermoplastic polyurethane fibers in which the ratio of A, B, and C is C/(A+B)=3/97 to 50150.

Another object of the present invention is that the organic diisocyanate is composed of (A) + MCH 6-0-C+ (B) ±(l(C1h)sOc+ CH3 as a repeating unit), and the ratio of A and B is as follows: 1/9 to 9/1,
A polyurethane consisting of an aliphatic copolycarbonate polyol in which the ratio of A, B, and C is c/(A+B)=3/97 to 50150 and a chain extender having two active hydrogens capable of reacting with incyanate is melt-blown. This is achieved by a method for producing a stretchable nonwoven fabric, which is characterized in that a fibrous web is obtained by spinning according to a method.

The aliphatic copolycarbonate polyol used in the present invention is described in Polymer Review (Polymer Review) by Shell.
lymer Review) Volume 9, pages 9-20 (1
It is synthesized from 1,6-hexanediol, 1,5-bentanediol and neopentyl glycol by various methods described in 964). The molecular weight is preferably 500 to 10,000, and the repeating units in the polymer are (A) +0-(CH2)6-0-C+ (B) 1,000-(CHz)s Oc+CH3 (C) 1,000-OCHz CCHz Oc- 3-CI(,0), the ratio of A and B is 1/9 to 9/1,
The ratio of A, B, and C is C/(A+B)=3/97 to 50150. When making a nonwoven fabric by the melt blowing method, if a polyurethane synthesized from a polycarbonate polyol consisting of the above A, B, and C alone is used, not only the stretch recovery property as a stretchable nonwoven fabric is poor, but also the blowability is poor. Balls were generated and it was difficult to make it into a non-woven fabric. However, when polyurethane using the polycarbonate polyol described in the present invention was used, surprisingly, the melt viscosity decreased.
The inventors have discovered that a nonwoven fabric with good blowability, good elongation recovery as a stretchable nonwoven fabric, small average fiber diameter, and soft texture can be obtained, and the present invention has been achieved.

Examples of the organic diisocyanate used in the present invention include 2.4-tolylene diisocyanate, 2.6-1
lylene diisocyanate, and mixtures thereof (TDI),
Diphenylmethane-4,4' diisocyanate) (M old)
, naphthalene-1,5-diisocyanate (?1DI)
, 3,3'-dimethyl-4,4'-biphenylene diisocyanate (TODI), crude TDI, polymethylene polyphenylisocyanate, crude MDI, and other known aromatic diisocyanates and xylylene diisocyanate (XDI), phenylene diisocyanate Known aromatic alicyclic diisocyanates such as 4,4'-methylenebiscyclohexyl diisocyanate (hydrogenated MDI), hexamethylene diisocyanate ()IMDI), isophorone diisocyanate (IPDI), cyclohexane diisocyanate (hydrogenated XDI), etc. Known aliphatic diisocyanates and the like can be mentioned.

As the chain extender used in the present invention, commonly used chain extenders in the polyurethane industry can be used, such as ethylene glycol, propylene glycol, 1.4
-butanediol, 1,6-hexanediol, 3-methyl-1,5-bentanediol, cyclohexanediol, xylylene glycol, 1,4-bis(β-hydroxyethoxy)benzene, neopentyl glycol,
3.3'-dichloro-4,4'-diaminodiphenylmethane, isophorone diamine, 4,4'-diaminodiphenylmethane, ethylene diamine, tetramethine diamine, hexamenediamine, hydrazine, dihydrazidotrimethylolpropane, glycerin, etc. I can do it.

Along with the aliphatic copolycarbonate polyol used in the present invention, a known high molecular weight polyol may be used in combination, depending on the use of the polyurethane, within a range that does not impair the effects of the present invention. Known high molecular weight polyols include polyoxyalkylene glycols such as polyethylene glycol, polypropylene glycol, and polyoxytetramethylene glycol, or polyether polyols such as alkylene oxide adducts of bisphenol A1 glycerin such as ethylene oxide and propylene oxide;
and dibasic acids such as adipic acid, phthalic anhydride, isophthalic acid, maleic acid, fumaric acid, and succinic acid, and ethylene glycol, diethylene glycol, propylene glycol, 1.4-butanediol, neopentyl glycol, 1.6 hexanediol, Examples include polyester polyols obtained by polycondensation reaction with glycols such as trimethylolpropane, polycaprolactone diol, polycarbonate diol, and the like.

As a method for producing polyurethane, a urethanization reaction technique known in the polyurethane industry is used.

In addition to 1,6-hexanediol, 15-bentanediol and neopentyl glycol, the present invention also provides compounds having three or more hydroxyl groups in one molecule, such as trimethylolethane, trimethylolpropane, hexanetriol, pentaerythritol. Polyurethane using polyfunctionalized polycarbonate is also included.

Furthermore, in the aliphatic copolycarbonate polyol used in the present invention, 1.6-hexanediol and 1.5-
In addition to bentanediol and neopentyl glycol,
Compounds with two or more hydroxyl groups in one molecule, such as 1.3-propanediol, 1.4-butanediol, 1.7-hebutanediol, 1.8-octanediol, 2-ethyl-1,6 -hexanediol, 2-methyl-1,3-propanediol, 3-methyl 1,5-bentanediol, 1,3-cyclohexanediol, 1
, 4-cyclohexanediol, 2,2'-bis(4-
hydroxycyclohexyl)propane, 2-methyl-1
, 8-octanediol, 1,9-nonanediol, P
-xylene diol, p-tetrachloroxylene diol, 1゜4-dimethylolcyclohexane, bishydroxymethyltetrahydrofuran, di(2-hydroxyethyl)dimethylhydantoin, diethylene glycol,
A small amount of diol such as triethylene glycol, polyethylene glycol, dipropylene glycol, polypropylene glycol, polytetramethylene glycol, thioglycol, etc. may be used as a copolymer component to the extent that the effects of the present invention are not impaired.

The polyurethane of the present invention is synthesized from a polyol, an organic diisocyanate, and a chain extender as described above, and the polyol component used in the present invention preferably accounts for 65% by weight or more of the total weight. If the content of the polyol component is low, the resulting nonwoven fabric will have low elongation and elongation recovery.

In the urethanization reaction, it is of course possible to use an appropriate amount of a polymerization catalyst known in the urethanization reaction, such as a tertiary amine or an organic metal salt of tin or titanium, if necessary. be. For example, "Polyurethane Technology" by Keiji Iwata (published by Nikkan Kogyo Shimbun), No. 23-32.
Examples include various polymerization catalysts described on p. These reactions may also be carried out using a solvent, and preferred solvents include dimethylformamide, diethylformamide, dimethylsulfoxide, dimethylacetamide, tetrahydrofuran, methylisobutylketone, dioxane,
Examples include one or more of cyclohexanone, benzene, and toluene.

Furthermore, various additives can be used to improve the heat resistance, light resistance, mold release properties, etc. of polyurethane. For example, Yoshinaga Abe and Makoto Sudo ed. “New Edition Plastic Compounds”
(Taiseisha) Phenolic antioxidants, amine antioxidants, sulfur antioxidants, as described in Nos. 151 to 158,
Phosphoric acid-based antioxidants or benzophenone-based, salicylate-based, benzotriazole-based, metal complex salt-based, hindered amine-based ultraviolet absorbers described in the above-mentioned "Plastic Compounding Agents", pages 178 to 182, further reinforcing fibers, fillers, Coloring agents, mold release agents, flame retardants, etc. can be used.

The stretchable nonwoven fabric made from the aliphatic copolycarbonate polyol polyurethane described so far by the melt-blowing method has particularly excellent hot water resistance, light resistance, and heat resistance, as well as good stretch recovery and chemical resistance (especially dry cleaning properties). Moreover, it was found to have a soft texture.

The number average molecular weight of the aliphatic copolycarbonate polyol polyurethane used in the present invention may be higher than that without neopentyl glycol because it contains neopentyl glycol, but preferably 30,000 to 150,000.
The number average molecular weight after being made into a nonwoven fabric is 20.000 to 13.
0,000. Furthermore, it is preferably 25,000 to 100,000, particularly 30,000 to so, ooo. If the number average molecular weight of the nonwoven fabric is less than 20,000, the strength of the nonwoven fabric will be too low to be of practical use, and the blowing properties will be unsatisfactory as there will be many beads. Moreover, if the number average molecular weight is 130,000 or more, the goo pressure during blowing increases, making it difficult to form a nonwoven fabric.

The average fiber diameter of the elastic fibers constituting the stretchable nonwoven fabric of the present invention is 0.5 to 25 mm, and preferably 1 to 12-1, particularly 1
It is preferable that it is 8 microns. Because it contains neopentyl glycol, the average fiber diameter can be reduced. If it is less than 0.5 tones, the fiber strength will be low although it is flexible, and as a result, the nonwoven fabric strength will be low, which is not preferable. On the other hand, if the number of voices exceeds 25, the soft texture that is the characteristic of melt blowing will be lost. In particular, the properties of nonwoven fabrics include filter performance, water pressure resistance,
Considering the above, the average fiber diameter is particularly preferably 8 or less.

The elastic nonwoven fabric of the present invention preferably has a basis weight of 5 g/rd or more, particularly 10 g/rtr or more.

5 g/n (below, the strength of the stretchable nonwoven fabric decreases).

In addition, it is recommended that a thermoplastic polymer be added to an extruder by chip blending or the like in an amount that does not impair the elongation properties that are the characteristics of the stretchable nonwoven fabric made of the aliphatic copolycarbonate polyol polyurethane of the present invention. It's not a hindrance. Examples include polyolefins (polyethylene, polypropylene, copolymers of ethylene and propylene, etc.), polyamides (nylon 6, nylon 66, etc.)
, nylon 12, etc.), polyvinyl chloride, and the like. The amount added will vary slightly depending on the type of thermoplastic polymer based on 100 parts by weight of polyurethane, but if it is less than 20 parts by weight, it is preferable as it will not significantly impair elongation recovery. Furthermore, depending on the type, the addition lowers the melt viscosity, improves the spinnability, and slightly improves the appearance of the nonwoven fabric.

Similarly, to the extent that the features of the stretchable nonwoven fabric of the present invention are not impaired, the nonwoven fabric may be colored by adding a coloring agent, such as titanium oxide, through chip blending or the like.

The stretchable nonwoven fabric of the present invention may be mixed with other synthetic fibers (polyester, polypropylene, etc.), recycled fibers, natural fibers, etc. (by spinning or post-processing, etc.).

Furthermore, the stretchable nonwoven fabric of the present invention can be used by laminating it with other nonwoven fabrics, knitted fabrics, films, and other sheet-like materials made by spunbond methods, card methods, wet methods, and the like. After the lamination, the stretchable nonwoven fabric and the sheet-like material may be bonded to each other by thermal bonding, entanglement treatment, or the like, if necessary.

It is particularly preferable to use a melt blowing method to obtain the stretchable nonwoven fabric of the present invention. An example of the melt blowing method of the present invention will be described below with reference to FIGS. 1 and 2.

Polyurethane is melted by an extruder 1, fed into a die 2, and extruded through a number of spinning orifices 12 arranged in a row provided in a nozzle. The molten polymer is extruded from orifice 12 through polymer channel 11 .

At the same time, the heated high-speed gas supplied through the gas inlet 13 is injected through the slits 5 provided on both sides of the orifice 12 through the gas header 14, and is blown against the flow of the extruded molten polymer. . A gas header 14 and an injection slit 5 can be provided between the nozzle 9 and the lip 10.

The extruded molten polymer is pulled into the shape of ultrafine fibers 4, thinned, and solidified by the action of the high-speed airflow. The ultrafine fibers thus formed are transported by a pair of rotating rollers 6
6 to form a random web 5. Steam, air, etc. are suitable as the gas, and the gas conditions include a temperature of 150 to 350°C, preferably 200 to 300°C.
The °C1 pressure is 0.1 kg/cd G or more, preferably 0.2 to 4.0 kg/cd G, although it varies depending on the discharge amount. The extruder temperature is 170 to 300°C, preferably 1
It is 80-280°C.

In addition, the distance between the goo and the collector is also important from the viewpoint of improving the strength of the nonwoven fabric due to the dispersibility of the single fibers and the bonding between the single fibers through self-thermal adhesion, and it is preferable that the distance is short in both cases, preferably 40 cm or less. is 30 cm or less.

As a thermal bonding method, the above-mentioned self-thermal adhesive force is particularly preferable because it not only improves the product quality by improving the dispersibility of single fibers but also is advantageous in terms of cost.

Furthermore, as another thermal bonding method, a hot embossing method, a hot roll method, a hot air method, an ultrasonic bonding method, etc. can be used. In particular, the hot roll method (e.g. upper metal roll, lower rubber roll) can apply pressure uniformly to the entire elastic nonwoven fabric, and by using a rubber roll (e.g. silicone rubber) for the lower layer with a hardness of 70°, it is possible to apply pressure uniformly to the entire elastic nonwoven fabric. It is preferable because it has good conformability, strengthens the bond between elastic fibers, improves the strength of the nonwoven fabric, and improves the surface smoothness. The temperature is 150°C or less, preferably 60 to 130°C, more preferably 80 to
The temperature range is 120°C and the pressure is 0.5-100kg.
/cm, preferably in the range of 1 to 75) cg/cm. At high temperatures and high pressures, it becomes a molten film and impairs air permeability.

Furthermore, at low temperatures and low pressures, thermal bonding becomes insufficient, making it impossible to improve the strength and surface smoothness of the nonwoven fabric.

The stretchable nonwoven fabric made of the aliphatic copolycarbonate polyol urethane of the present invention thus obtained had excellent dry cleaning resistance and hot water resistance compared to that made of polyester polyurethane.

[Example〕 The present invention will be explained in more detail with reference to Examples below.

The definitions and measurement methods of various physical properties shown in Examples and Comparative Examples are shown below.

◎Average fiber diameter (Sir) Ten arbitrary points on the sample were examined using an electron microscope at a magnification of 2000.
Take 10 photos at double magnification. Measure the diameter of 10 arbitrary fibers for each photograph, and do this for each of the 10 photographs. A total of 100 fiber diameter measurements are obtained and the average value is calculated.

◎Polymer beads; several 10 to 50 times the diameter of the web-constituting fibers
It is a bead-shaped polymer with a diameter of about 0 times. These polymer beads can be seen with the naked eye.

0 strength and elongation; JIS L-10 for a 2 cm wide sample
According to 96, grip interval 5cm, pulling speed 10cm/m
The elongation is measured as the strength per 1 cm width at the maximum stress.

◎100% elongation recovery rate: A sample with a width of 2 cu+ is elongated to 100% with a gripping interval of 120 and a tensile speed of 10 cm/min, and immediately recovered to steaming at the same speed. Before stretching, check the difference in stretching before and after stretching (
a) m+ was determined and calculated using the following formula.

◎Dry cleaning property: After immersing in Perculen solution for 52 hours, Perculen was wiped off with a filter paper, and after air drying, the appearance was visually judged and the strength retention rate before and after immersion in Perculen was determined.

◎Light resistance: Discoloration and fading after 40 hours of irradiation using a fade meter.
The strength retention rate before and after irradiation was determined.

◎Mold resistance i A mold resistance test was conducted according to JIS Z 2911. A mixed mold spore suspension was sprayed onto the sample and cultured for 4 weeks at a temperature of 28°C and a humidity of 97%.
The state of mold growth was observed daily with the naked eye and under a stereomicroscope. Judgment was made based on the evaluation criteria below.

Evaluation criteria ○: No mycelial growth is observed in the inoculated part of the sample or test piece.

Δ: The area of mycelia growth observed in the inoculated part of the sample or test piece does not exceed 173 of the total area.

×: The area of mycelia growth observed in the inoculated part of the sample or test piece exceeds 173 of the total area.

416 g (4 mol) of neopentyl glycol was placed in a reactor equipped with a stirrer, thermometer, fractionator, and vacuum pump.
Charge 528 g (6 mol) of ethylene carbonate, and while flowing a small amount of N2 gas into the system, raise the reaction temperature to 14 mol.
The temperature was set at 0''C and the reaction was started with stirring.

Gradually reduce the pressure in the system to 65 cam Hg after 2 hours.
At that point, a mixture of ethylene glycol, ethylene carbonate, and neopentyl glycol was distilled from the top of the column. At this time, the temperature at the top of the column was 95°C. Thereafter, the pressure in the system was lowered to 5 mmHg over a period of 10 hours to carry out the polymerization reaction. After the reaction was completed, 240 g of polymer was obtained. This polymer (NPG-PCDL) is 13C-N
By MR, CI.

It was confirmed that it has a repeating unit of +OCHz CCHz OC+ C)l, 0 and is a terminal hydroxyl group. In addition, the number average molecular weight was determined by GPC to be 30
It was 00.

1.5-bentanediol 1.6-hexanediol, 1.
5-bentanediol 2261 g (21.74 mol
), 2330 g of 1,6-hexanediol (19,7
5 mol), ethylene carbonate 3480 g (40
, Omol), and while flowing a small amount of N2 gas into the system, at 130"C and under a reduced pressure of 30 to 4MHg, 19.
The reaction was allowed to proceed for 5 hours. During this time, ethylene glycol and ethylene carbonate were distilled out from the top of the column. Thereafter, the reaction temperature was raised to 200°C, and the reaction was carried out at 4 to 2 mmHg for 8.3 hours. At this time, the system was evacuated without using a fractionator, and ethylene glycol, ethylene carbonate, 1.
5-bentanediol and 1,6-hexanediol were distilled off. The total amount of distillate from the reactor was 1768 g of ethylene glycol, 968 g of ethylene carbonate,
1,5-bentanediol 893g, 1,6
-Hexanediol 342g. After the reaction was completed, 3930 g of a polymer having a number average molecular weight of 2700 was obtained. After that, the pressure reduction was further repeated to distill out 1.5-bentanediol and 1.6-hexanediol, which had a number average molecular weight of 3.
Obtained 300 polymers.

Konopori? (C5,6-PCOL) Ha, I'
It was confirmed by C-NMR that it had a repeating unit of +0(CL)-QC÷0χ=5 or 6, and that the terminal was a hydroxyl group.

Input of NPG C5,6-PCDL obtained above, NPG-PCDL 240gXC1&-P
COL 600g, 1.5-bentanediol 6g for molecular weight adjustment, and neopentyl glycol 8g were charged into a reactor, and stirred at 200"C for 8 hours under N2 gas atmosphere.
Number average molecular weight 2000 Novo IJ 7- (NPG/C5
,,-PCDL) were obtained. Its composition is KOH/EtO
GC of each monomer component obtained by depolymerization with H
The results were 31.6% of 1.5-bentanediol units, 36.8% of 1.6-hexanediol units, and 29.6% of neopentyl glycol units. The glass transition temperature is -43,
8°C, no melting point was observed, and the material was substantially amorphous. NPG/Cs obtained in this way, b-PCDL,
200 parts, hexamethylene diisocyanate 100.
8 parts were charged into a reactor and reacted at 100°C for 4 hours to produce NCO
A terminal prepolymer was obtained. The prepolymer was added with 43.44 parts of 1°4-butanediol as a chain extender and n as a terminal stopper.
After adding 0.52 parts of -butanol and 0.007 parts of dibutyltin dilaurate as a catalyst and reacting at 170°C for 2 hours, the mixture was formed into strands using a screw type extruder, and pelletized by pelletizing and sieving.

The number average molecular weight of the obtained polyurethane pellets was 480.
The content of the polyol component was 78.5%.

The polyurethane resin obtained in this way was put into an extruder, and N
While sealed with gas, the extruder was melted by heating at an extruder temperature of 220°C, and the diameter of 0.5 mm was arranged in a row at a single hole discharge rate of 0.2 g/min.
Using a melt blow nozzle with a sharpened tip of 4 runφ and slits for jetting heated fluid at both ends, superheated steam at 270°C was injected as a fluid at 1.2 kg/
The molten polymer was injected from the slit at a pressure of ciG to thin the molten polymer, and the fiber group was collected on a moving net conveyor (die-collector distance 30C ([+)).The obtained web was It was a soft stretchable nonwoven fabric with no polymer beads, and its physical properties were as follows.

Average fiber diameter: 4.5/ITII size: 80g/ryf strength
; 520 g/c+n Elongation; 490% 100% elongation recovery rate; 95% General comparison ±1 A web was obtained under the same conditions as in Example 1 except that NPC-PCOL was not used. The average fiber diameter of this stretchable disarmament nonwoven fabric was 7 tones, which was thicker than Example 1 under the same conditions except that NPC-PCDL was not used.

Backing I In the same manner as in Example 1, N of the prepolymer and chain extender
By changing C0101 (the number average molecular weight is 70,000,
Pellets of 1,50,000 and 170,000 were obtained and made into non-woven fabrics by melt blowing.

70,000, a good web similar to that of Example 1 was obtained.

The melt viscosity of 15,000 yen was too low, so balls formed frequently and a proper web could not be obtained.

170,000, the melt viscosity was too high, the die pressure increased, and the test was discontinued.

A performance comparison was made between the nonwoven fabric (A) obtained in Example 1 and a commercially available polyurethane nonwoven fabric (B) (Esbancione 0).

[Effects of the Invention] Since the stretchable nonwoven fabric of the present invention is configured as described above, it has excellent heat resistance, hot water resistance, and light resistance, and is also extremely soft, has stretch recovery properties, and chemical resistance (especially dry cleaning properties). It is also a good non-woven fabric and can be used as clothing batting, poultry material,
Supporter-1 Elastic tape interlining, mouth rubber for clothing, bandages,
It can be expanded to a wide variety of product groups, including industrial supplies such as diapers, gloves, hats, surgical gowns, and sporting goods.

The stretchable nonwoven fabric according to the present invention having the above-mentioned properties can be stably produced by the manufacturing method of the present invention using a melt blowing method.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an example of a melt blowing process. FIG. 2 is a sectional view showing an example of a die used in the melt blowing process. DESCRIPTION OF SYMBOLS 1... Extruder, 2... Melt blow die, 3... Gas pipe, 4... Ultrafine fiber group, 5...
... Random web, 6... Drive roller 7... Screen, 8... Calendar roll, 9...
Nozzle, 10... Lip, 11... Molten polymer channel, 12... Spinning orifice, 13... Gas inlet, 1
4...Lip gas header 15...Gas slit.

Claims (2)

[Claims] (1) In a polyurethane consisting of an organic diisocyanate, an aliphatic copolycarbonate polyol, and a chain extender having two active hydrogens capable of reacting with the isocyanate, the aliphatic copolycarbonate polyol is used as a repeating unit by ▲ mathematical formula, chemical formula, or etc. ▼ and the ratio of A and B is 1/9 to 9/1, and A,
A stretchable nonwoven fabric characterized by being mainly composed of thermoplastic polyurethane fibers in which the ratio of B and C is C/(A+B)=3/97 to 50/50. (2) It has an organic diisocyanate and a repeating unit ▲There are mathematical formulas, chemical formulas, tables, etc.▼, and the ratio of A and B is 1/9 to 9/1, and A,
A polyurethane consisting of an aliphatic copolycarbonate polyol in which the ratio of B and C is C/(A+B) = 3/97 to 50/50 and a chain extender having two active hydrogens capable of reacting with isocyanate is melt-blown. 1. A method for producing a stretchable nonwoven fabric, which comprises spinning the fabric to obtain a fibrous web.