KR100570255B1 - Elastic polyurethane fiber - Google Patents

Abstract

The present invention is (a) a single or copolymerized polyalkylene ether diol having a number average molecular weight of 400 to 2000 and a melting point of 20 ° C. or less, (b) a higher alcohol having an OH group at the terminal and having 8 to 25 carbon atoms, and (C) Polyurethane elastic fibers preferred for paper diaper applications, to which a treating agent comprising a mineral oil, dimethylsilicone, or a mixture of mineral oil and dimethylsilicone having a kinematic viscosity at 25 ° C. of 5 to 50 centistokes is attached. to provide.

Polyurethane elastic fibers, paper diapers, polyalkylene ether diols, higher alcohols, mineral oils, treatment agents, removable

Description

Polyurethane Elastic Fiber {ELASTIC POLYURETHANE FIBER}

The present invention relates to a polyurethane elastic fiber. Specifically, it relates to a polyurethane elastic fiber preferred for use in the rubber portion of paper diapers. More specifically, a polyurethane elastic fiber having adhesion to a nonwoven fabric, unwinding from a package, low friction with a slope changing guide, and aesthetics of a diaper or comfort when worn. It is about.

Polyurethane elastic fibers, which are laminated and used between non-woven fabrics overlapped as so-called rubber parts on the main parts and corners of a paper diaper, are conventionally used for manufacturing process of paper diapers, that is, a guide for changing the slope in the process until the polyurethane elastic fibers are laminated. In order to reduce friction, various inorganic metal compounds were added to polyurethane elastic fibers.

However, these inorganic metal compounds may impair the transparency of the polyurethane elastic fibers. In recent years, paper diapers having small animal or floral designs printed on the back sheet of the paper diaper have been used. In the case of such a paper diaper, there is a problem that the beauty of the design is impaired if the polyurethane elastic fibers do not have transparency in the portion where the polyurethane elastic fibers overlap on the design. For this reason, the polyurethane elastic fiber which did not add these inorganic metal compounds as much as possible for paper diaper use was desired. However, polyurethane elastic fibers with a small amount of inorganic metal compound added have a large number of trimmings in the slope guide of the manufacturing process because of increased guide friction, which makes it difficult to apply them to paper diaper applications.

Moreover, when adhesiveness with a nonwoven fabric is bad, there exists a problem which a rubber part loosens at the time of wearing, and falls down at the time of wearing, and there exists a proposal to improve adhesiveness. Japanese Patent Application Laid-Open No. 5-50429 proposes an elastic yarn winding body having good dissociation and adhesiveness, to which a treatment agent is adhered at 2% by weight or less or without a treatment agent. Japanese Patent Laid-Open No. 2000-327224 proposes an elastic yarn winding body having good sea resolution and adhesiveness, which is given 10.0% by weight. Japanese Patent Laid-Open No. Hei 10-152264 proposes an elastic yarn winding body having good sea-solubility and adhesion with an oil agent having a specific surface tension.

On the other hand, in order to manufacture a paper diaper having good stretchability and recoverability, Japanese Patent Laid-Open No. 2001-29386, for example, gives an elastic yarn four times or more an elongation, and then shrinks and recovers it. The manufacturing method of the paper diaper to supply is proposed. However, in this method, since it is necessary to pass the stretch-contraction recovery treatment process when winding up the elastic fiber or after winding up, the process is complicated and loss of trimming and the like tends to occur.

As described above, in the prior art, there is no elastic fiber that can satisfy the process performance such as aesthetics of a paper diaper, wearing comfort, maritime property and adhesiveness at the same time.

Accordingly, an object of the present invention is to solve the above problems, and does not require an extra step in the manufacture of paper diapers, excellent adhesion to the nonwoven fabric, excellent seamability from the wound package, process performance with less trimming during running of the yarn. A polyurethane elastic fiber used for the rubber part of the paper diaper which is excellent in a back, is comfortable at the time of wearing, is transparent, and has a favorable appearance.

In addition, another object of the present invention is a paper diaper, which is easy to attach and detach, exhibits easy fit and comfortable fit, and can produce a paper diaper which can flexibly adapt size to body changes even in a remarkable growth child. It is to provide a polyurethane elastic fiber preferred for the use.

That is, the present application provides the following invention.

(1) (a) single or copolymerized polyalkylene ether diols having a number average molecular weight of 400 to 2000 and a melting point of 20 ° C. or less;

(b) higher alcohols having OH groups at the ends and having 8 to 25 carbon atoms, and

(C) mineral oil, dimethylsilicone, or mixtures of mineral oil and dimethylsilicone, having a kinematic viscosity of 5 to 50 centistokes at 25 ° C.

Polyurethane elastic fiber comprising a polyurethane polymer to which a treating agent comprising a.

(2) The polyurethane polymer according to (1) above,

(i) organic diisocyanate compounds,

(ii) a copolymerized polyalkylene ether diol having a number average molecular weight of 500 to 5000, in which at least one linear or branched alkylene group having 1 to 8 carbon atoms and tetramethylene group are ether bonded in a block or random phase, and

(iii) active hydrogen-containing compounds that react with isocyanate groups

Polyurethane elastic fiber which is a polyurethane polymer obtained from.

(3) The process according to (1) or (2), wherein the treatment agent is 15 to 95% by weight of component (a), 2 to 30% by weight of component (b), and 3 to 80% by weight of component (c Polyurethane elastic fiber comprising a).

(4) The polyurethane elastic fiber according to any one of (1) to (3), wherein a treatment agent in an amount of more than 2 parts by weight is attached to 100 parts by weight of the polyurethane elastic fiber.

(5) The polyurethane elastic fiber as described in any one of said (1)-(4) whose kinetic friction coefficient is 1.6 or less.

(6) The polyurethane according to any one of (1) to (5), further comprising an inorganic metal compound, wherein the content of the inorganic metal compound is less than 1.0 part by weight based on 100 parts by weight of the polyurethane elastic fiber. Elastic fibers.

(7) The polyurethane elastic fiber as described in any one of said (1)-(5) which does not contain an inorganic metal compound.

(8) The polyurethane elastic fiber according to any one of (1) to (7), wherein the single or copolymerized polyalkylene ether diol which is component (a) is polypropylene glycol.

(9) The polyurethane elastic fiber winding body by which the polyurethane elastic fiber in any one of said (1)-(8) is wound up.

(10) The paper diaper manufactured using the polyurethane elastic fiber in any one of said (1)-(8).

(11) to a polyurethane elastic fiber containing a polyurethane polymer,

(a) 15 to 95% by weight alone or copolymerized polyalkylene ether diols having a number average molecular weight of 400 to 2000 and a melting point of 20 ° C. or less;

(b) 2 to 30% by weight of a higher alcohol having an OH group at the terminal and having 8 to 25 carbon atoms, and

(C) 3 to 80% by weight of mineral oil, dimethylsilicone, or a mixture of mineral oil and dimethylsilicone having a kinematic viscosity of 5 to 50 centistokes at 25 ° C

Method of producing a polyurethane elastic fiber, comprising the step of adhering a treating agent comprising a

1 is an apparatus for performing trimming evaluation of an elastic fiber winding body.

2 is an apparatus for performing friction evaluation of elastic fibers.

Best Mode for Carrying Out the Invention

EMBODIMENT OF THE INVENTION Below, this invention is demonstrated in detail.

The present inventors have found that when the polyurethane elastic fiber with a specific treatment agent is used in the rubber portion of a paper diaper, the process performance is excellent, the wearer's detachability is easy, the wearability is excellent, and the size application ability is also excellent.

As the polyurethane polymer in the polyurethane elastic fiber of the present invention, a polyurethane polymer obtained by reacting a polymer diol, an organic diisocyanate compound and an active hydrogen-containing compound is preferably used.

As the polymer diol, known polyether diols, polyester diols, polycarbonate diols and the like can be used, and polyether diols are preferable.

As the polyether diol, polyalkylene ether diols having a number average molecular weight of 500 to 5000 are preferable, and polytetramethylene ether glycol (described as PTMG), or copolymerized polyalkylene ether diol containing tetramethylene group and other alkylene groups, etc. Can be mentioned. Polyurethane polymers containing polyalkylene ether diols have excellent stretch properties and hydrolysis resistance. Among them, copolymerized polyalkylene ether diols in which at least one linear or branched alkylene group having 1 to 8 carbon atoms, different from the tetramethylene group and the tetramethylene group, are ether-bonded in a block or random phase is most preferred.

As the structure of the copolymerized polyalkylene ether diol, HO-AOAOAOBOBOB-OH and A each having a tetramethylene group A and an alkylene group other than B, each having HO-AOB-OH, A block and B block And HO-AOBOAOBOAOB-OH or the like in which B is regularly arranged, or a structure in which A and B are randomly arranged, and the like.

Since the polyalkylene ether diol contains two or more alkylene groups, the polyalkylene ether diol is less difficult to crystallize at elongation than in the case of using a polyalkylene ether diol containing one type of alkylene group, thereby providing flexibility and low hysteresis loss characteristics. And polyurethane elastic fibers excellent in low residual distortion characteristics. When this is used in the rubber part of the paper diaper, a paper diaper having a comfortable detachment and wearing comfort and size adaptability can be obtained.

The copolymerized polyalkylene ether diol used in the present invention is, from the viewpoint of the water resistance, light resistance, and abrasion resistance of the polyurethane elastic fiber obtained, one of the alkylene groups is a tetramethylene group, and another one or more carbon atoms other than the tetramethylene group It may be a linear or branched alkylene group of 1 to 8. Among them, copolymerized polyalkylene ether diols of tetramethylene with neopentylene and / or 2-methylbutylene, that is, copolymerized poly (tetramethylene neopentylene) ether diol and copolymerized poly (tetramethylene-2-methyl Butylene) ether diol is preferred. In view of the elastic function, copolymerized poly (tetramethylene neopentylene) ether diol is most preferred.

Copolymerization of Tetramethylene Group with Other Alkylene Group In the polyalkylene ether diol, alkylene units other than tetramethylene are 3 mol% or more and 85 mol% when the total alkylene units contained in the diol are 100 mol%. It is preferable that it is the following, and 4 mol% or more and 70 mol% or less are more preferable. When alkylene units other than tetramethylene are less than 3 mol%, the improvement effect of an elastic function will become small, and when it exceeds 85 mol%, elongation and strength will tend to fall.

As the organic diisocyanate, for example, any of aliphatic, alicyclic and aromatic diisocyanates that exhibits dissolution or liquid phase under reaction conditions can be applied. For example, methylene-bis (4-phenylisocyanate), methylene-bis (3-methyl-4-phenylisocyanate), 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, m- and p-xylylene diisocyanate, α, α, α ', α'-tetramethyl-xylylene diisocyanate, m- and p-phenylene diisocyanate, 4,4'-dimethyl-1,3-xylyl Ethylene diisocyanate, 1-alkylphenylene-2,4 and 2,6-diisocyanate, 3- (α-isocyanateethyl) phenyl isocyanate, 2,6-diethylphenylene-1,4-diisocyanate, diphenyl -Dimethylmethane-4,4-diisocyanate, diphenylether-4,4'-diisocyanate, naphthylene-1,5-diisocyanate, 1,6-hexamethylene diisocyanate, methylene-bis (4-cyclohexyl Isocyanate), 1,3- and 1,4-cyclohexylene diisocyanate, trimethylene diisocyanate, tetramethylene diisocyanate, penta Diisocyanate, and the like can be mentioned hexamethylene diisocyanate, isophorone diisocyanate. Methylene-bis (4-phenylisocyanate) is preferred.

Examples of the active hydrogen atom-containing compound which is a chain extender include hydrazine, polyhydrazine, compounds having 2 to 10 carbon atoms, linear or branched aliphatic, alicyclic or aromatic, and active hydrogen-containing amino groups, and the like, for example, ethylenediamine , Diamines such as diamines having urea groups described in JP-A-5-155841, hydroxylamine, water, or low molecular weight glycols such as ethylene glycol, 1,2-propylene glycol, 1,3-propylene glycol, 2,2-dimethyl-1,3-propanediol, 1,4-butanediol, 1,3-butanediol, hexamethylene glycol, diethylene glycol, 1,10 -Decanediol, 1,3-dimethylolcyclohexane, 1,4-dimethylolcyclohexane, and the like can be used. Ethylenediamine and 1,2-propylenediamine are preferred.

As a compound which has a monofunctional active hydrogen atom which is a terminal terminator, dialkylamine like diethylamine, etc. are used, for example.

These chain extenders and terminal terminators may be used alone or in combination of two or more thereof.

In the present invention, a technique of a known polyurethane polymerization reaction can be used for the production of a polyurethane polymer using a single or copolymerized polyalkylene ether diol, a diisocyanate compound and an active hydrogen-containing compound. For example, a polyalkylene ether diol and an organic diisocyanate are reacted at a molar ratio of 1: 1.2 to 2.2, preferably 1: 1.3 to 1.8, to synthesize a urethane prepolymer having an isocyanate group at both ends, and subsequently The urethane prepolymer may be subjected to a chain extension reaction with a diamine compound or a glycol compound to obtain a polyurethane polymer.

For the operation of the polyurethane reaction, a solvent such as dimethylformamide, dimethyl sulfoxide, dimethylacetamide, or the like may be used at the time of synthesizing the urethane prepolymer or reacting the urethane prepolymer with an active hydrogen-containing compound. have.

As for the stoichiometric ratio of the various compounds used by this invention, it is preferable that the sum total of the hydroxyl group of polyalkylene ether diol, and active hydrogens, such as a diamine compound, is 1.00-1.07 equivalent with respect to the isocyanate group of an isocyanate compound. Since the polyurethane elastic fiber of this invention is provided with the processing agent which has a specific lubricant performance as mentioned later, it does not contain an inorganic metal compound or only a trace amount contains sufficient friction, and ensures the transparency of a fiber can do. Examples of the inorganic metal compound used in the polyurethane elastic fiber of the present invention include metal oxides, hydroxides, carbonates, nitrates, sulfates and mono- or inorganic metal complex salts thereof selected from the group of Ti, Mg, Al, Zn and Ca. Etc. can be mentioned. Preferred inorganic metal compounds include titanium oxide, zinc oxide, magnesium oxide, hydrotalcite and huntite. From the viewpoint of improving the friction, titanium oxide is particularly preferable. It is preferable that content of the inorganic metal compound in the polyurethane elastic fiber of this invention is 1.0 weight part or less with respect to 100 weight part of polyurethane solid content, and may not contain it. More preferably, it is 0.5 weight part or less, Especially preferably, it is 0.3 weight part or less. If the addition amount is 1.0 parts by weight or more, the transparency of the polyurethane elastic fiber tends to be lowered, and when the trace amount is added, process trimming due to friction is improved.

Polyurethane elastic fibers include organic or inorganic compounds known as additives other than the above, for example, heat stabilizers, antioxidants, ultraviolet absorbers, yellowing agents, heat discoloration inhibitors, anti-sticking agents, pigments, antistatic agents, and flavoring agents (mildew- proofing agent), colorant, filler and the like may be added in combination.

A polyurethane elastic fiber can be obtained by performing dry spinning, melt spinning, or wet spinning with respect to a polyurethane polymer (or the polyurethane polymer composition containing an additive) by a conventional method.

The number of single yarns of the polyurethane elastic fibers is not limited and may be either monofilament or multifilament, but from the viewpoint of adhesion, a multifilament having a single yarn fineness of 5 to 15 dt (decectex) is preferable. The total fineness of the polyurethane elastic fibers is preferably 180 to 2200 dt.

The obtained polyurethane elastic fiber is provided with a processing agent by well-known methods, such as roll oil ring, guide oil ring, spray oil ring, before or after winding up to a paper tube package.

The present inventors apply a treatment agent containing a specific composition described in detail below to a polyurethane elastic fiber, thereby improving not only the processing performance such as adhesion, maritime properties, trimming properties, etc., but also the elastic performance of the yarn. It was found that the effect was given. In particular, by adhering to a polyurethane elastic fiber using a low polycrystalline copolymerized polyalkylene ether diol, the polyurethane elastic fiber is difficult to crystallize at the time of elongation, so that it is elongated at low stress during elongation and high recovery at the time of contraction. Polyurethane elastic fibers having a so-called soft elasticity performance are obtained, which show the properties and are excellent in low hysteresis loss characteristics and low residual distortion characteristics. When this is used for the rubber part of the paper diaper, a paper diaper having a comfortable detachment and wearing feeling and size adaptability can be obtained.

Hereinafter, each component contained in a processing agent is explained in full detail.

The single or copolymerized polyalkylene ether diol compound of component (a) penetrates into the amorphous part of the soft segment of the polyurethane polymer of the present invention based on the copolymerized diol and is assumed to have an effect as a lubricant. As a result, a softer elastic characteristic is expressed at the time of stretching the elastic fibers. Since the component (a) penetrates into the yarn and hardly remains in the surface layer portion of the yarn, the effect of reducing the slope change guide resistance is small. The component (a) has a number average molecular weight of 400 to 2000, a melting point of 20 ° C. or less, and is obtained by polymerizing or copolymerizing alkylene oxides such as ethylene oxide and propylene oxide, or by using a low molecular weight polyalkylene glycol. It is obtained by further copolymerizing with ethylene oxide and propylene oxide. Among them, a polymer of propylene oxide alone, that is, polypropylene glycol (described as PPG) is preferable. When the number average molecular weight of a single or copolymerized polyalkylene ether diol compound is less than 400, it is likely to scatter from the yarn with time. In addition, when the number average molecular weight exceeds 2000, the degradability deteriorates. In addition, if the melting point exceeds 20 ℃ deterioration in the winter season, as a result, trimming frequently occurs during the paper diaper manufacturing process.

When the treatment agent containing only the component (a) is attached to the polyurethane elastic fiber, its disintegration property is inferior. Therefore, in addition to the component (a), the mineral oil, dimethylsilicone, or mineral oil and dimethylsilicone which are components (c) It is necessary to include the mixture as a treating agent.

As dimethyl silicone in (c) component, 1) polydimethylsiloxane containing a dimethylsiloxane unit, 2) polydialkylsiloxane containing the dialkylsiloxane unit containing a dimethylsiloxane unit and a C2-C4 alkyl group And 3) polysiloxanes containing a dimethylsiloxane unit and a methylphenylsiloxane unit. Preference is given to polydimethylsiloxanes (described as DMS).

The kinematic viscosity at 25 ° C. of the mineral oil and dimethylsilicone in component (c) is 5 to 50 centistokes when measured by a conventional method using a cannon-Fenske viscosity tube in a constant temperature water bath.

Further, in order to increase the compatibility so that the component (a) and the component (c) can be uniformly attached to the polyurethane elastic fiber, a higher alcohol having 8 to 25 carbon atoms having an OH group at the terminal, which is the component (b), is treated with a treatment agent. It needs to be included as. As such (b) component, higher aliphatic alcohols, such as isostearyl alcohol (it describes as ISA) and isoamyl alcohol, are preferable.

Since these three components adhere to the polyurethane elastic fiber of this invention, the polyurethane elastic fiber for paper diapers which satisfy | fills comfort comfort and fairness simultaneously can be obtained for the first time. In order to obtain the polyurethane elastic fiber of this invention, although it is also possible to adhere each treatment agent containing each component, it is most preferable to adhere the treatment agent containing the said three components simultaneously. As such a processing agent, the ratio of (a), (b), (c) three component in a processing agent is 15 to 95 weight% of (a) component, 2 to 30 weight% of (b) component, and (c) component It is preferable that it is the range of 3 to 80 weight%. If the component (a) is less than 15% by weight, soft elastic properties are not obtained. If the component (a) is more than 95% by weight, the disintegration property of the elastic fibers is reduced. If the component (b) is less than 2% by weight, the compatibility of the treatment agent cannot be ensured. If the component (b) is more than 30% by weight, the stability of the treatment agent is lowered. When the component (c) is less than 3% by weight, the disintegration property is inferior, and when the component (c) is more than 80% by weight, the ratio of the component (a) is lowered, so that the effect of the present invention is not obtained. Preferably it is the range of 20 to 95 weight% of (a) component, 2 to 20 weight% of (b) component, and 3 to 70 weight% of (c) component.

It is preferable that the adhesion amount of a processing agent is an amount exceeding 2 weight part with respect to 100 weight part of polyurethane elastic fibers from a viewpoint of process performance, such as adhesiveness of a polyurethane elastic fiber, maritime property, and trimming in a process, More preferably, Is 2.1 to 5.0 parts by weight, most preferably 2.3 to 3.0 parts by weight.

In the treatment agent, mineral fine particles such as polyester-modified silicone, polyether-modified silicone, polyorganosiloxane, amino-modified silicone, aminoether-modified silicone, talc, silica, colloidal alumina other than the above components, magnesium stearate And higher fatty acid metal salt powders such as calcium stearate, higher aliphatic carboxylic acids, paraffins, polyethylene, and waxes which are solid at room temperature, such as rosin, may be further added as long as the effects of the present invention are not impaired. .

The polyurethane elastic fiber of this invention has transparency, and is characterized by favorable friction. It is preferable that the dynamic friction coefficient (mud) by the method mentioned later is 1.6 or less, It is more preferable that it is 1.5 or less, It is especially preferable that it is 1.3 or less. If it exceeds 1.6, trimming is likely to occur in the manufacturing process of the paper diaper.

Since the polyurethane elastic fiber of this invention gives the processing agent which has a specific lubricant performance, it does not need to go through an elongation-contraction recovery process etc. before supplying to a paper diaper manufacturing process, and is excellent in process performance, and soft It has elasticity performance and can be used suitably as a rubber part of transparent diaper paper.

Hereinafter, embodiment of this invention is described in detail with reference to an Example.

<Examples 1 to 13 and Comparative Examples 1 to 5>

Although an Example demonstrates this invention concretely, this invention is not limited by these.

The evaluation method used for this invention was as follows.

(1) Maritime property (speed of maritime in reverse take)

After spinning 1 kg of the 1240 dt / 144 filament elastic fiber 4 kg wound body wound in a paper tube for 1 month in an atmosphere of 25 ℃, 65% RH, at 25 ℃, 2 days at 15 ℃, 40% RH, It evaluated after leaving for 1 month in the atmosphere of 65% RH.

The wound body was placed on a textured roller, the elastic fiber was sent out at a roller surface speed of 100 m / min while the roller was rotated, and wound on a textured roller of the same diameter installed 50 cm away. The surface speed on the roller to be wound was gradually lowered from 200 m / min, and the speed at which the elastic fibers on the roller to be fed out started the reverse winding was measured. The smaller this value, the better the yarn was loosened from the winding body, and it was judged that the sea resolution was good.

(2) emissary evaluation

The 470 dt elastic fiber 2.0 kg winding body which was spun and wound up in the paper tube was measured using the apparatus shown in FIG. Speed 50 m / min of elastic fiber feeding roll (A), speed 80 m / min of pre-draft roll (B) which wound elastic yarn three times, speed 80 m / min of winding roll (E) Wound up. The behavior of the elastic fiber at the (F) site was visually observed for 20 minutes and evaluated based on the following criteria.

○: less than 1 cm thread vibration width. (Triangle | delta): 1 cm or more of thread vibration widths. ×: refused.

(3) adhesive

0.1 g / m of hot-melt adhesive was attached to one doubled 1240 dt elastic fiber, and both sides were sandwiched with a nonwoven fabric of polypropylene, and elastic fibers and spun bonds were heated therefrom with a thermal object at 130 ° C. spun bond) was thermally compressed. After leaving this at the conditions of 40 degreeC for 1 week, the thermocompression body was cut | disconnected to 200 mm length, and it left for 24 hours in 35 degreeC atmosphere of body temperature, and measured the length of an elastic fiber. When the adhesiveness was good, the shrinkage was small, and when it did not shrink at all, it was 200 mm, and when it was completely contracted, the thickness was 100 mm.

(4) removable

470 dt of elastic fiber which was spun and wound up in a paper tube was supplied to a paper diaper manufacturing process by a known method to produce a paper diaper using elastic fibers in a rubber part of the recess and each part. Fifteen infants 9 months to 13 months of age were compared to his mother for ease of attachment and detachment at the time of wearing and desorption after urination using a paper diaper made experimentally under the same conditions as a blind test. The following score was given and the average value was shown.

5 points | pieces: Removability is very good.

4 points | pieces: Good detachability

3 points | pieces: normal detachability

2 points: Desorption is slightly bad

1 point | piece: bad detachability

(5) size adaptability

Five infants of 13 months of age were allowed to use a paper diaper experimentally prepared under the same conditions as a blind test, peeled off after urination, and examined for the presence of red marks in the abdomen and crotch and the presence of urine leakage.

About the red mark, the following symbols were attached by the judgment degree by visual observation.

(Circle): There is no red mark. (Triangle | delta): Red mark exists thinly. ×: Red mark is clearly confirmed.

(6) friction

The 2.0 kg elastic fiber of 310 dt elastic fiber wound and wound around the paper tube was measured using the apparatus shown in FIG. It wound up at the speed of 50 m / min of the elastic fiber delivery roll (A), the speed of 80 m / min of the pre-draft roll (B) which wound the elastic yarn 3 times, and the speed of 150 m / min (C). The stress T1 and T2 at the time of real run at this time were measured, and the dynamic friction coefficient ((mu) d) was calculated by following Formula.

μd = In (T2 / T1) /0.5π

The smaller the mu d, the better the friction with the ceramic hook guide.

(7) transparency evaluation

Ten 310 dt polyurethane elastic fibers were arranged on a picture of a commercially available paper diaper having a design of an animal picture on the back sheet, and the degree of difficulty in viewing the picture was visually observed to determine the following criteria.

(Circle): transparency and favorable. Δ: slightly inferior in transparency. X: There is no transparency.

(Examples 1 to 8)

400 g of copolymerized poly (tetramethylene neopentylene) ether diol having a number average molecular weight of 1800 (described as PTXG, copolymerization rate of neopentylene 11 mol%), and 91.7 g of 4,4'-diphenyl methane diisocyanate The reaction was carried out at 80 DEG C for 3 hours in a dry nitrogen atmosphere under stirring to obtain a polyurethane prepolymer whose end was capped with isocyanate. After cooling to room temperature, 720 g of dimethylacetamide was added to dissolve to prepare a polyurethane prepolymer solution. On the other hand, 8.11 g of ethylenediamine and 1.37 g of diethylamine were dissolved in 390 g of dimethylacetamide, and this was added to the prepolymer solution at room temperature to obtain a polyurethane solution having a viscosity of 4000 poise (30 ° C).

To the polyurethane solution obtained by repeating this operation, 1 weight% of 4,4'-butylidenebis (3-methyl-6-t-butylphenol) was 2-weighted 2- (2'-hydroxy) with respect to a polyurethane solid content. 0.5 wt% of -3'-t-butyl-5'-methylphenyl) -5-chloro-benzotriazole was added to obtain a spinning stock solution. In addition, in Example 3, 0.3 weight part of titanium oxides was added with respect to 100 weight part of polyurethane solid content.

The spinning solution thus obtained was extruded from the pores of the spinneret into hot air to evaporate the solvent. The dried yarn was combusted in the course of passing through a false-twisting machine, the treatment agent was imparted on the oil ring roller via a high speed roller, and wound into a paper tube at a speed of 500 m / min. Spinnerets and spinning conditions were appropriately changed to obtain three types of polyurethane elastic fibers: 1240 dt / 144 filament, 470 dt / 56 filament, and 310 dt / 36 filament.

As shown in Table 1 below, after changing the composition and the adhesion amount of the treatment agent to obtain the polyurethane elastic fibers of Examples 1 to 8, various performance evaluation of the polyurethane elastic fibers were performed. The mineral oil in Table 1 was 15 centistokes and dimethylsilicone was 10 centistokes polydimethylsiloxane.

(Comparative Examples 1 to 4)

As shown in Table 1, the polyurethane elastic fibers of Comparative Examples 1 to 4 were obtained in the same manner as in Example 1 except that the composition and adhesion amount of the treatment agent were changed, and then various performance evaluations of the polyurethane elastic fibers were performed. . Moreover, in the comparative example 2, the processing agent which consists of 2 weight% of calcium stearate and 98 weight% of mineral oil was made to adhere.

(Examples 9 to 13)

Viscosity 4100 poise (30) obtained similarly using polytetramethylene ether diol (PTMG) of number average molecular weight 1800 instead of the copolymer poly (tetramethylene neopentylene) ether diol of the number average molecular weight 1800 of Example 1 (30) 1 weight% of 4,4'-butylidenebis (3-methyl-6-t-butylphenol) with respect to a polyurethane solid content in the polyurethane solution of (degree. C.), 2- (2'-hydroxy-3 '). 0.5 wt% of -t-butyl-5'-methylphenyl) -5-chloro-benzotriazole was added to obtain a spinning solution. In Examples 10 and 12, a predetermined amount of titanium oxide was added, respectively. The polyurethane elastic fiber to which the processing agent shown in Table 1 was affixed similarly to Example 1 from this spinning stock solution was produced, and various performance evaluation of the said polyurethane elastic fiber was performed.

(Comparative Example 5)

Except having changed the composition and adhesion amount of the processing agent as shown in Table 1, the polyurethane elastic fiber of the comparative example 5 was obtained like Example 9-13, and various performance evaluation of the said polyurethane elastic fiber was performed. .

The paper diaper using the polyurethane elastic fiber of this invention is easy to attach and detach, and it is easy to be active, and shows comfortable fitting property. In addition, even in the case of remarkable growth, the child can flexibly adapt the size to the body shape change.

Further, the polyurethane elastic fiber of the present invention has excellent performances such as excellent adhesiveness with a nonwoven fabric at the time of paper diaper manufacture, excellent disintegration property from a wound package, and low trimming process performance during running of the yarn.

Claims (11)

(a) a single or copolymerized polyalkylene ether diol having a number average molecular weight of 400 to 2000 and a melting point of 20 ° C. or less, (b) higher alcohols having OH groups at the ends and having 8 to 25 carbon atoms, and (C) mineral oil, dimethylsilicone, or a mixture of mineral oil and dimethylsilicone, having a kinematic viscosity of 5 to 50 centistokes at 25 ° C Polyurethane elastic fiber comprising a polyurethane polymer to which a treating agent comprising a. The method of claim 1 wherein the polyurethane polymer (i) organic diisocyanate compounds, (ii) a copolymerized polyalkylene ether diol having a number average molecular weight of 500 to 5000, in which at least one linear or branched alkylene group having 1 to 8 carbon atoms and ether tetramethylene group are ether-bonded in a block or random phase, and (iii) active hydrogen-containing compounds that react with isocyanate groups Polyurethane elastic fiber which is a polyurethane polymer obtained from. The process according to claim 1 or 2, wherein the treatment agent comprises from 15 to 95% by weight of component (a), from 2 to 30% by weight of component (b) and from 3 to 80% by weight of component (c). Polyurethane elastic fibers. The polyurethane elastic fiber of Claim 1 or 2 with which the processing agent of the amount exceeding 2 weight part with respect to 100 weight part of polyurethane elastic fibers is affixed. The polyurethane elastic fiber of Claim 1 or 2 whose dynamic friction coefficient is 1.6 or less. The polyurethane elastic fiber of Claim 1 or 2 which further contains an inorganic metal compound and whose content of the said inorganic metal compound is less than 1.0 weight part with respect to 100 weight part of polyurethane elastic fibers. The polyurethane elastic fiber of Claim 1 or 2 which does not contain an inorganic metal compound. The polyurethane elastic fiber according to claim 1 or 2, wherein the component (a) alone or copolymerized polyalkylene ether diol is polypropylene glycol. The polyurethane elastic fiber winding body by which the polyurethane elastic fiber of Claim 1 or 2 is wound up. The paper diaper manufactured using the polyurethane elastic fiber of Claim 1 or 2. To polyurethane elastic fiber containing a polyurethane polymer, (a) 15 to 95% by weight alone or copolymerized polyalkylene ether diols having a number average molecular weight of 400 to 2000 and a melting point of 20 ° C. or less; (b) 2 to 30% by weight of a higher alcohol having an OH group at the terminal and having 8 to 25 carbon atoms, and (C) 3 to 80% by weight of mineral oil, dimethylsilicone, or a mixture of mineral oil and dimethylsilicone having a kinematic viscosity of 5 to 50 centistokes at 25 ° C A method for producing a polyurethane elastic fiber, comprising the step of adhering a treating agent comprising a.

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