JP2001316974A - Treatment agent for polyurethane elastic fiber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a treatment agent for polyurethane elastic fibers that causes excellent adhesion, high safety to the skin and excellent fiber lubricity as well as the inhibition of agglutination between fibers, when the polyurethane elastic fibers are wound up and excellent unreeling properties. SOLUTION: The objective treatment agent for polyurethane elastic fibers comprises 95-70 wt.% of a polypropylene glycol type polyol and 5-30 wt.% of a reaction product between the polypropylene glycol type polyol with an organic diisocyanate, where the molecular weight of the polypropylene glycol type polyol is 200-1,500 and the reaction product is prepared by allowing the polypropylene glycol type polyol with a molecular weight of 200-2,000 to react with the organic diisocyanate in the proportion of 50-90 equivalent % of the isocyanate groups of the organic diisocyanate to the hydroxyl groups of the polypropylene glycol type polyol. The resultant polyurethane elastic fiber treatment agent has an apparent viscosity of 50-250 mPa.s at 30 deg.C and a surface tension of 30-45 dyne/cm.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a treatment agent for polyurethane elastic fibers subjected to a heat bonding treatment,
More specifically, when a polyurethane elastic fiber is bonded to a sheet-like structure to form a portion requiring elasticity, such as a disposable diaper, a sanitary product, a patch material, etc., the adhesiveness is excellent and the safety to the skin is high, Excellent in smoothness of fiber, preventing sticking between fibers when using polyurethane elastic fiber as a wound body,
The present invention relates to a treatment agent for polyurethane elastic fibers having excellent unwinding properties.

[0002]

2. Description of the Related Art Polyurethane elastic fibers have excellent elastic properties and are therefore used in various fields requiring stretchability and fit. Since the polyurethane elastic fiber is usually provided as a wound body obtained by winding a filament into a roll, the polyurethane elastic fibers tend to adhere to each other in the wound body, and the fiber is unraveled when pulled out from the wound body and used. There is a tendency that the washability deteriorates. In order to prevent these, a dimethyl silicon-based or mineral oil-based treating agent is usually applied to the surface of the polyurethane elastic fiber.

Further, when polyurethane elastic fibers are used continuously in the manufacture of disposable diapers and sanitary articles, it is necessary to replace the wound body of the elastic fibers. Large packages for increasing the winding amount of the wound body are in progress. In such a large package, fibers tend to adhere to each other, particularly in the core layer of the wound body, and application of a treating agent is indispensable to prevent this.

However, when a conventionally used treating agent is applied to the surface of the fiber, it is possible to prevent the fiber from sticking. However, if such a fiber is bonded to another member by an adhesive or a heat treatment, it is attempted. In this case, there is a disadvantage that the adhesiveness is significantly impaired.

As a method for solving this drawback, Japanese Patent Publication No.
Japanese Patent Application Laid-Open No. 50429 discloses that the amount of the oil agent attached to the polyurethane elastic filament yarn is reduced to 2% by weight or less so that the apparent elongation in the wound yarn is within a certain range with respect to the value of the treatment agent attachment amount. It is disclosed that the adhesiveness is good in an application for a disposable diaper. According to this method, the adhesion amount of the oil agent is suppressed to 2% by weight or less, so that the problem of the adhesiveness can be solved to some extent, but even in the wound body obtained in this way, the winding shape and the unwinding property are poor. However, sufficient effects have not been obtained.

Japanese Patent Application Laid-Open No. 10-152264 discloses an oil agent having a surface tension of 25 to 30 dynes / cm.
It is disclosed that the elastic filament yarn provided in an amount of more than 5% by weight but not more than 5% by weight does not impair the adhesiveness and also has a good unwinding property of the yarn from the wound body. However, the oil agent specifically described in the specification mainly uses the same silicone oil as the conventional oil agent.
If it is added in an amount of about 5% by weight, it cannot be said that the adhesiveness is still sufficient.

On the other hand, the use of a polypropylene glycol-based polyol as an oil agent has been used for polyester filaments and polyamide filaments. In particular, with the increase in the spinning speed, a technique of using a polypropylene glycol-based polyol having a special structure as an oil agent for the purpose of maintaining the winding shape of a wound body, for example, is disclosed in JP-A-10-273876. It has been disclosed. JP-A-7-157969 discloses that the addition of a polypropylene glycol-based polyol to polyurethane elastic fibers has the effect of preventing the yarn from swelling during spinning and preventing the generation of oil spots during dyeing. I have.

[0008]

DISCLOSURE OF THE INVENTION The present invention provides excellent adhesiveness, high safety to the skin, excellent smoothness of fibers, and prevents sticking between fibers when a polyurethane elastic fiber is used as a wound body. It is an object of the present invention to provide a polyurethane elastic fiber treating agent which prevents the elasticity of the polyurethane elastic fiber and has an excellent unwinding property.

[0009]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to solve the above-mentioned problems, and as a result, a urethane-based compound having a low degree of polymerization was mixed with a polypropylene glycol-based polyol to give polyurethane elastic fibers. By doing so, the present inventors have found that the thermal adhesion is significantly improved, and have reached the present invention. That is, the present invention provides 95 to 70% by weight of the component (A), which is a polypropylene glycol-based polyol, and 5 to 3% of the component (B), which is a reaction product of a polypropylene glycol-based polyol and an organic diisocyanate compound.
0% by weight and a treating agent for polyurethane elastic fibers. And, the molecular weight of the polypropylene glycol polyol used for the component (A) is 200 to 1500, and the molecular weight of the polypropylene glycol polyol used for the component (B) is 200 to 2000,
And the component (B) has an isocyanate group of the organic diisocyanate compound of 50 to 9 with respect to the hydroxyl group of the polyol.
It is a treating agent for polyurethane elastic fiber which is a product reacted at 0 equivalent%. Further, the treating agent for polyurethane elastic fibers obtained in the present invention has an apparent viscosity at 30 ° C. of 50 to 250 mPa · s and a surface tension of 30 to 45 dynes / cm.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The polyurethane elastic fiber to which the polyurethane elastic fiber treating agent of the present invention is applied is not particularly limited, and is obtained by dissolving polyurethane in a solvent and spinning by a wet method or a dry method. Or a polyurethane obtained by heating and melting a polyurethane and spinning it by a melting method. In addition, if necessary, a light-resistant agent, an ultraviolet absorber, a gas discoloration inhibitor, a dye , An activator, a matting agent and the like may be contained.

The component (A) constituting the polyurethane elastic fiber treating agent of the present invention is a polypropylene glycol diol and / or a triol obtained by polymerizing propylene oxide alone or together with ethylene oxide, and the polyol has a weight average molecular weight. 200-15
No. 00 is a polypropylene glycol-based polyol.
If the weight-average molecular weight of the polyol is less than 200, the low-molecular-weight substance remains on the fiber surface, which is unfavorable because it inhibits thermal adhesion. Further, if the weight average molecular weight of the polyol exceeds 1500, the viscosity of the resulting treating agent increases, resulting in sticking of fibers to each other, which deteriorates the unwinding property of the fibers from the polyurethane elastic wound body. Absent. In addition, a part of the hydroxyl group of the polyol may be esterified or acylated.

The component (A) constituting the polyurethane elastic fiber treating agent of the present invention prevents the fibers from sticking to each other when the polyurethane elastic wound body is formed and improves the unwinding property. The component (B) does not adversely affect the physical properties of the polyurethane elastic yarn to be treated, and imparts excellent adhesion when the treated elastic fiber is used in a sheet-like structure. The component (B) is a reaction product of a polypropylene glycol-based polyol and an organic diisocyanate compound. The component (B) is a polypropylene glycol-based polyol obtained by polymerizing propylene oxide alone or with ethylene oxide as a polypropylene glycol-based polyol and / or Or, using triol, as an organic diisocyanate compound, for example, 4,
4'-diphenylmethane diisocyanate, 3,3'-
1 selected from dichloro-4,4'-diphenylmethane diisocyanate, m-xylylene diisocyanate, 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, hexamethylene diisocyanate, etc.
It is obtained by reacting a polyol component and an organic diisocyanate component using one or more species.

The weight average molecular weight of the polypropylene glycol polyol used at this time is preferably from 200 to 2,000. When the weight-average molecular weight is less than 200, the content of the hard segment in the component (B), which is the reaction product obtained when the compound is reacted with an organic diisocyanate compound, becomes high, resulting in a hard gel (A) )
Since the compatibility with the components is lost, the desired treating agent for polyurethane elastic fibers cannot be obtained. Also, 200
If it exceeds 0, the molecular weight of the component (B), which is the obtained reaction product, will be high, and the apparent viscosity of the resulting treating agent may be high. It is not preferable because the unwinding property is deteriorated. Conversely, the apparent viscosity may not be increased, and in this case, a sufficient effect on the thermal adhesiveness cannot be obtained, which is not preferable.

When the above component (B) is obtained, the isocyanate group of the organic diisocyanate compound to be used, or when a plurality of organic diisocyanate compounds are used, the total of the isocyanate groups is 50 to 90 with respect to the hydroxyl group of the polyol to be used. The reaction is carried out by mixing to give an equivalent%, preferably 50 to 70 equivalent%. If the proportion of the isocyanate group is higher than this, the degree of polymerization of the component (B) obtained is increased, the compatibility with the component (A) is reduced, and the unwinding property of the fiber may be impaired even when used as a treating agent. is there.
If the proportion of the isocyanate group is further increased, the isocyanate group remains in the component (B) and reacts with the component (A) when mixed with the component (A) in order to obtain a treating agent. It is not preferable because a treatment agent having a viscosity range specified in the invention may not be obtained. On the other hand, if the amount of the isocyanate group is too small, unreacted polyol increases in the component (B), and a sufficient effect on the thermal adhesiveness may not be obtained, which is not preferable. The reaction conditions for obtaining the component (B) are not particularly limited as long as the polyol component and the organic diisocyanate component used are sufficiently reacted.

The fiber treating agent of the present invention comprises the above-mentioned component (A) which is the polypropylene glycol-based polyol.
An apparent viscosity at 30 ° C. of a treating agent obtained by mixing 5 to 70% by weight with 5 to 30% by weight of the component (B) which is a reaction product of a polypropylene glycol-based polyol and an organic diisocyanate compound. But 50-250m
It must be in the range of Pa · s and the surface tension must be in the range of 30 to 45 dynes / cm. If the proportion of the component (B) is higher than 30% by weight, the unwinding property of the fiber from the obtained elastic wound body is undesirably deteriorated.
Further, when the proportion of the component (B) is lower than 5% by weight,
When the apparent viscosity is less than 50 mPa · s, the adhesiveness due to thermal bonding decreases. When the apparent viscosity exceeds 250 mPa · s, it becomes difficult to uniformly apply the treating agent to the polyurethane elastic fiber. Results
It is not preferable because the unwinding property of the fiber from the elastic fiber wound body is deteriorated. If the surface tension is less than 30 dynes / cm, the adhesiveness due to thermal bonding is reduced. If the surface tension exceeds 45 dynes / cm, the fibers adhere to each other and hinder the unwinding of the fibers from the wound body. Absent.

As described above, since the component (B) used in the present invention is a urethane compound having a low degree of polymerization, the compatibility with the component (A) of the polypropylene glycol polyol is excellent. By applying the treating agent of the present invention obtained by blending the component (B) and the polyurethane elastic fiber to the polyurethane elastic fiber, the effect of preventing the fibers inherent in the treating agent from sticking to each other can be exhibited. Expresses excellent adhesiveness.

The treating agent of the present invention is usually applied to the polyurethane elastic fiber in an amount of 3.0 to 10.0% by weight. The applying step is performed after spinning until winding as a wound body. Alternatively, it may be carried out until the fiber is drawn from the wound body after spinning and once wound and then rewinded to another wound body. It may be applied by a method such as contact.

If the amount of the fiber treating agent is less than 3.0% by weight, the fibers adhere to each other to impair the unwinding property. When the amount exceeds 10.0% by weight, the fibers are liable to slip with each other, the yarn layer of the wound wound body is broken, or a protruding yarn is formed due to yarn spots, and the appearance of the obtained wound body is deteriorated. Therefore, it is not preferable.

As described above, when the polyurethane elastic fiber treating agent of the present invention is used, the adhesiveness at the time of heat bonding is good, it has a good shape without collapse, and the fibers are prevented from sticking to each other. Thus, it is possible to obtain a polyurethane elastic fiber wound body having a suitable unwinding property.

[0020]

The present invention is not limited to the following examples. All parts are by weight, and the viscosity was measured using a B-type rotational viscometer. The adhesion amount of the fiber treatment agent, unwinding property, appearance, and adhesion were evaluated by the following methods.

<Amount of treatment agent> Temperature 20 ° C., relative humidity 6
1. About 2% of polyurethane elastic yarn samples left overnight at 5%.
After accurately weighing W ₁ g of 0 to 2.5 g with an electronic balance,
The sample was placed in 3 L of petroleum ether and sonicated for 10 minutes. Next, the sample was taken out, vacuum-dried at 80 ° C. for 30 minutes, left again at a temperature of 20 ° C. and a relative humidity of 65% for 1 hour or more, and precisely weighed W ₂ g with an electronic balance. In addition, the same spinning solution as the measurement sample was spun, and the same operation was performed using the polyurethane elastic yarn obtained without the treatment agent as a sample to measure W ₁ ′ and W ₂ ′. The treatment agent adhesion amount (%)
It was calculated by the following equation. Fiber treatment agent adhesion amount (%) = ｛(W ₁ −W ₂ ) / W ₂ − (W _{1
'-W 2') / W} 2 '} × 100

<Unwinding property> The surface layer of the polyurethane elastic fiber wound body is removed to leave only the core layer having a winding thickness of about 2 cm, and the fiber is sent out from the wound body at a rate of 10 m / min. Measure the minimum winding speed S (m / min) at which the yarn cannot be pulled up in the rotation direction at the point where the yarn is unwound from the winding body when winding the yarn onto another paper tube whose center distance is 50 cm away from the tube. Then, it was calculated by the following equation. The unwinding property was measured immediately after preparing the wound body and after leaving it at room temperature for one month.
When the value of the unwinding property is 0%, it indicates that unwinding of the yarn from the elastic fiber wound body can be performed without tension, and in this case, it is difficult to maintain the shape of the wound body. It is. The numerical value of the unwinding property is usually preferably in the range of 40 to 70%. Unwinding property (%) = (S-10) / 10 × 100

<Appearance> The wound shape of the polyurethane elastic fiber wound body was observed and evaluated in the following three grades. ×: Prominent yarns due to twill drop and winding spots are remarkably confirmed on the winding side surface, and the whole is in a collapsed state. Δ: No twill drop or protruding yarn was observed on the winding side, but the winding shape was not good overall. ：: There is no abnormality in the winding shape.

<Adhesive Property> Eight polyurethane elastic fibers each having a length of 8 cm are arranged on a spunbonded nonwoven fabric made of polypropylene, eight samples per sample, and heated and melted at 145 ° C. (Hitachi Chemical Polymer Co., Ltd., trade name: Hybon H96
10) A tape-like polypropylene spunbonded nonwoven fabric having a width of 10 mm, which is uniformly applied with a roller, is placed on the polyurethane elastic fiber sample so as to be orthogonal to the elastic fiber sample, and a load of 8.4 g / in cm ² was pressed for 1 minute. The obtained adhesive strip was cut into each of the polyurethane elastic fiber samples, and an elastic fiber sample was formed at one end of a sample holding portion of a tensile tester (manufactured by Orientec Co., Ltd., Tensilon RTA-100), and polypropylene was formed at the other end. Each nonwoven fabric was sandwiched, one end was pulled at a speed of 400 mm / min, and the strength required to pull out the elastic fiber sample from the polypropylene nonwoven fabric was measured.

Example 1 Propylene oxide was polymerized alone to obtain a component (A) of a polypropylene glycol-based polyol having a weight average molecular weight of 200. Further, a polypropylene glycol having a weight average molecular weight of 1,000 obtained by polymerizing propylene oxide alone is mixed with 4,4 ′.
-Diphenylmethane diisocyanate in 60
After keeping the temperature at 90 ° C., the mixture was charged into a stainless steel container kept at 60 ° C. in advance so that the ratio of isocyanate groups to hydroxyl groups became 50 equivalent%. Temperature to 90
The mixture was reacted at 6 ° C. for 6 hours to obtain a component (B). The components (A) and (B) are combined with (A) :( B) at 99:
1, 95: 5, 80:20, 70:30, and 60:40 to obtain five types of polyurethane elastic fiber treating agents. 1 to No. It was set to 5. The apparent viscosities at 30 ° C. of the respective treatment agents were 60, 87, 150, 250, and 404 mPa · s, respectively, and the surface tension of each treatment agent was 35.8, 3 respectively.
5.6, 34.7, 30.1, 26.8 dynes / cm.

A polyurethane elastic fiber having a fineness of 620 dtex was obtained from the sample No. obtained above. 1 to No. 5 was brought into contact with the roller to which each of the treating agents was adhered.
At a rate of / min. And wound around a paper tube while elongating 5% to obtain a polyurethane elastic wound body having a winding amount of 1.0 kg. At this time, the rotation speed of the roller was adjusted such that the treatment agent adhesion amount was 7.5 ± 0.5%. A polyurethane elastic fiber obtained by performing the same operation except that the treating agent was not attached was used as Comparative Sample 1. The treatment agent adhesion amount, unwinding property, appearance, and adhesion of the obtained polyurethane elastic fiber wound body to which each treatment agent was added were measured, and the results are shown in Table 1.

[0027]

[Table 1]

As is clear from Table 1, the comparative sample 1 was not provided with a treating agent, so that the comparative sample 1 had a 1
Since the unwinding property after one month has significantly deteriorated, it is considered that the fibers are agglutinated with time in the wound yarn, which is not preferable for storage. Further, the sample No. Sample No. 1 was inferior in adhesion to the comparative sample because the blending ratio of the component (B) was lower than 5%. No. 5 has an apparent viscosity of 250 mPa · s due to a high mixing ratio of the component (B).
It is higher and the surface tension is lower than 30 dynes / cm, resulting in poor unwinding. On the other hand, the sample No. 2-No. 4 is the component (A) 9 of the present invention.
Since the treatment agent containing 5 to 70% by weight and 5 to 30% by weight of the component (B) is applied, the unwinding property immediately after the preparation and the one-month period are shorter than that of the comparative sample 1 not provided with the treatment agent. The difference with the later unwinding property is small, and it is difficult for the fibers to adhere to each other even during storage, and it is clear that the polyurethane elastic fiber treating agent has excellent adhesiveness and excellent unwinding property. It is.

Example 2 Propylene oxide was polymerized alone and had a weight average molecular weight of 150, 200, 150.
Four types of (A) components of 0 and 2000 polypropylene glycol-based polyols were obtained. Separately, polypropylene glycol having a weight average molecular weight of 400 obtained by polymerizing propylene oxide alone and 4,4'-diphenylmethane diisocyanate were each kept at 60 ° C, and then the ratio of isocyanate groups to hydroxyl groups was determined. Was charged to a stainless steel container which had been kept at 60 ° C. in advance so that the content became 70 equivalent%, and the temperature was raised to 90 ° C. while stirring with a screw-type stirrer under nitrogen gas filling, and further reacted at 90 ° C. for 6 hours. Thus, the component (B) was obtained. Each of the four components (A) and (B) is 90:10 (A) :( B).
, To obtain four types of polyurethane elastic fiber treating agents. 6-No.
It was set to 9. The apparent viscosities at 30 ° C. of the respective treatment agents are 80, 175, 245, and 370 mPa · s, respectively.
The surface tension of each treatment agent is 32.2, 35. respectively.
3, 36.8 and 37.3 dynes / cm.

A polyurethane elastic fiber having a fineness of 620 dtex was obtained from the sample No. obtained above. The treatment agents Nos. 6 to 9 were respectively brought into contact with the rollers, and were wound around a paper tube at a speed of 100 m / min while elongating 5% to obtain a polyurethane elastic yarn wound body having a yarn winding amount of 1.0 kg. . At this time, the rotation speed of the roller was adjusted such that the treatment agent adhesion amount was 7.5 ± 0.5%. In addition, No. As for No. 7, the treatment agent adhesion amount was 2.0 ± 0.5%, 15.0 ± 0.05%.
The same operation was performed except that the rotation speed of the roller was adjusted to 5%. The treatment agent adhesion amount, unwinding property, appearance, and adhesion of the obtained polyurethane elastic fiber wound body provided with each treatment agent were measured, and the results are shown in Table 2.

[0031]

[Table 2]

As is clear from Table 2, the sample No. In Sample No. 6, the molecular weight of the component (A) was less than 200, so that the adhesiveness was slightly poor. In Sample No. 9, the molecular weight of the component (A) was 150.
Since it exceeds 0, the appearance of the wound body is deteriorated,
Unwinding property is slightly worse. On the other hand, in the sample No. of the present invention. 7 to sample no. Compared to Comparative Sample 1 of Example 1 to which no treating agent was applied, Sample No. 8 was excellent in adhesiveness, and the difference between the unwinding property immediately after preparation and the unwinding property after one month was small. Above all, sticking between fibers is unlikely to occur. In addition, the sample No. 7, the treatment agent adhesion was 2.0
Adjusted to ± 0.5% and wound, the adhesion was too small to obtain sufficient adhesion, and conversely adjusted the adhesion to 15.0 ± 0.5% and wound In the case of the case, the wound shape is deteriorated because the amount of adhesion is too large. On the other hand, the polyurethane elastic fiber wound with the treatment agent adhesion amount adjusted to 7.5 ± 0.5% is excellent in both unwinding property and adhesiveness, and is excellent in the treatment agent of the present invention. It is clear that

Example 3 Propylene oxide was polymerized alone to obtain a component (A) of a polypropylene glycol-based polyol having a weight average molecular weight of 400. The weight average molecular weight obtained by polymerizing propylene oxide alone is 150, 200, 400, 1000, 2000,
3000 of each polypropylene glycol and 4,
After each of 4′-diphenylmethane diisocyanate was kept at 60 ° C., it was charged into a stainless steel container which was kept at 60 ° C. in advance so that the ratio of isocyanate groups to hydroxyl groups became 50 equivalent%. The temperature was raised to 90 ° C. while stirring with a stirrer, and further reacted at 90 ° C. for 6 hours to obtain six types of component (B). The component (A) and each of the six types of component (B) are combined with (A):
(B) was mixed at a ratio of 90:10 to obtain six types of polyurethane elastic fiber treating agents. 10-No. It was set to 15. The apparent viscosities at 30 ° C. of the respective treatment agents are 245, 211, 185, respectively.
125, 115, and 142 mPa · s, and the surface tensions of the respective treatment agents were 31.8, 32.1, 34.8, 3
6.2, 36.5 and 36.5 dynes / cm.

A polyurethane elastic fiber having a fineness of 620 dtex was obtained from the sample No. obtained above. 10-No. Each of the 15 treatment agents was brought into contact with the roller on which
At a speed of m / min, the yarn was wound around a paper tube while being stretched by 5% to obtain a polyurethane elastic yarn wound body having a yarn winding amount of 1.0 kg. At this time, the rotation speed of the roller was adjusted such that the treatment agent adhesion amount was 7.5 ± 0.5%. The treatment agent adhesion amount, unwinding property, appearance, and adhesiveness of the obtained polyurethane elastic fiber wound body to which each treatment agent was added were measured, and the results were shown in Table 3.
It was shown to.

[0035]

[Table 3]

As is clear from Table 3, the sample No. Sample No. 10 has a molecular weight of the polypropylene glycol-based polyol used as the component (B) of less than 200, so that the desired treating agent cannot be obtained, the appearance of the wound body is poor, and the sample N
o. In No. 15, since the molecular weight of the component (B) exceeds 2,000, the adhesiveness is reduced. On the other hand, in the sample No. of the present invention. 11 to sample no. No. 14 is superior in adhesiveness to Comparative Sample 1 of Example 1 to which no treatment agent is applied, and has a small difference between the unwinding property immediately after production and the unwinding property after one month. Even in the inside, adhesion of the fibers is hardly generated, and it is clear that the fiber is an excellent treating agent.

[0037]

As described above, the present invention relates to a polypropylene glycol-based polyol (A) containing 95 to 7 components.
A polyurethane elastic fiber treating agent obtained by blending 0% by weight with 5 to 30% by weight of the component (B) which is a reaction product of a polypropylene glycol-based polyol and an organic diisocyanate compound. , 30
The apparent viscosity at 50 ° C. is 50 to 250 mPa · s, and the surface tension is 30 to 45 dynes / cm.
By applying the treatment agent of the present invention to polyurethane elastic fibers, the polyurethane elastic fibers are adhered to a sheet-like structure to form a stretchable portion such as a disposable diaper, a sanitary product, or a patch material. It develops excellent adhesiveness. Further, the fiber treating agent of the present invention has high safety to the skin and excellent in smoothness of the fiber. When the polyurethane elastic fiber is used as a wound body, the fiber treating agent has the inherent performance, This is a polyurethane elastic fiber treating agent capable of imparting an effect of preventing sticking and moderate unwinding properties.

Claims (4)

[Claims] (1) 95 to 70% by weight of the following component (A):
A polyurethane elastic fiber treating agent comprising 5 to 30% by weight of the following component (B): (A) Component: Polypropylene glycol-based polyol (B) Component: Reaction product of a polypropylene glycol-based polyol and an organic diisocyanate compound. 2. The polyurethane elastic fiber treating agent according to claim 1, wherein the molecular weight of the polypropylene glycol polyol as the component (A) is from 200 to 1500. 3. The polypropylene glycol polyol used as the component (B) has a molecular weight of 200 to 2,000, and the component (B) has an isocyanate group of the organic diisocyanate compound of 50 to the hydroxyl group of the polyol.
The polyurethane elastic fiber treating agent according to claim 1 or 2, wherein the product is a product reacted at ~ 90 equivalent%. 4. An apparent viscosity at 30 ° C. of 50 to 25.
4. The pressure is 0 mPa · s, and the surface tension is 30 to 45 dynes / cm. 5.
The treating agent for polyurethane elastic fibers according to any one of the above.