JP2022083999A - Polyurethane elastic yarn and method for producing the same - Google Patents

Abstract

To provide a polyurethane elastic yarn excellent in thermal adhesive properties and unwindability together with spinnnability and telescopic motion properties, and a method for producing the same.SOLUTION: A polyurethane elastic yarn is primarily composed of a polyurethane that includes a polymer diol and a diisocyanate as the main starting substances, the polyurethane elastic yarn including the following three components of (a) to (c): (a) a thermoplastic polyurethane elastomer; (b) a rosin and/or a derivative thereof; and (c) a cellulose ester and/or a derivative thereof.SELECTED DRAWING: None

Description

The present invention relates to a polyurethane elastic yarn having high thermal adhesive strength over a wide temperature range and excellent unfoldability while maintaining stretch characteristics (permanent strain rate and elongation).

Elastic fibers are widely used for elastic clothing applications such as legwear, innerwear, and sportswear, and for industrial materials because of their excellent elastic properties.

When such elastic fibers are used in the general clothing field, they are usually cross-woven and then the fabric is cut, sewn, finished, and the like to become a product. When a fabric woven by cross-knitting using polyurethane elastic fibers is cut and sewn, the edges are easily frayed, and at the frayed edges, the polyurethane elastic fibers come off from the knitted fabric structure of the fabric, and that portion. There arises a problem that the elastic property of the cloth is deteriorated.

In ordinary products, some kind of trimming is performed to prevent the edges from fraying after cutting. For example, it is common to fold back the cut edge, sew it in a double layer, wrap it in another cloth such as tape, and sew it. However, the anti-fray post-treatment work such as trimming and sewing is troublesome in the production process of clothing products, and is economically a heavy burden. Moreover, in clothing products that have been trimmed or sewn in this way, the thickness of that part becomes thicker and a step is created. Therefore, in underwear such as foundations, when outerwear is worn on top of it, outerwear The step appears to be convex, which spoils the appearance. In addition, many clothing using polyurethane elastic fibers are directly fitted to the body such as foundations and pantyhose, and there is also a problem that thickened edges reduce the wearing feeling.

In the field of foundations such as brassieres, girdles, body suits, etc., which have become fashionable in recent years in order to solve the above-mentioned problems related to the edges of clothing using polyurethane elastic fibers and the sewing of edges, the edges of cuts and edges have been removed. A method for manufacturing a garment product having a so-called uncut opening, in which the line of underwear does not appear in outerwear by not sewing, is being studied.

For example, the knitted structure is a 1 × 1 knitted fabric in which an inelastic yarn and an elastic yarn are accompanied, and at least one of the inelastic yarn and the elastic yarn in each knitting needle is a warp knitted fabric knitted by a closed stitch. Clothing using a fabric that does not require edge disposal has been proposed (see, for example, Patent Document 1).

In addition, low melting point polyurethane elastic yarn is used as the heat-sealing elastic yarn, and other yarns are knitted by plating knitting, and a knitted fabric with heat set processing that has an anti-fray function is used, and the yarn is similarly cut. Clothing with openings has been proposed. (See Patent Document 2)
Further, as heat-fused elastic yarns, polyurethane elastic yarns containing thermoplastic polyurethane (see Patent Document 3) and polyurethane elastic yarns containing a heat-bonding component (see Patent Documents 4 and 5) have been proposed.

Japanese Patent Application Laid-Open No. 2003-147618 Japanese Unexamined Patent Publication No. 2005-113349 Japanese Unexamined Patent Publication No. 2007-177359 Japanese Unexamined Patent Publication No. 2010-150676 Japanese Unexamined Patent Publication No. 2009-144267

In the technique of Patent Document 1, since the edges structurally cut by the fabric design are less likely to fray, the fabric itself becomes thick, and there are restrictions on the fabric obtained by the fabric design. There is a problem that the usage is limited.

In the technique of Patent Document 2, the low melting point polyurethane elastic yarn has a large deterioration in physical properties due to heat in the setting process for molding the fabric or product and the dyeing process, so that the fabric is treated under high temperature conditions. Decreased resilience occurs. Furthermore, when subjected to more severe thermal processing conditions, yarn breakage of the polyurethane elastic yarn occurs. Therefore, there is a problem that the products using this fabric have thermal restrictions on the processing conditions.

Further, even with the techniques of Patent Documents 3 to 5, the adhesive performance has not yet reached a satisfactory level. In addition, the inclusion of the heat-bonding component may worsen the thread separation at the time of unwinding. An object of the present invention is to provide a polyurethane elastic yarn having excellent spinnability, stretchability, thermal adhesiveness and unfoldability, and a method for producing the same.

The polyurethane yarn of the present invention employs any of the following means in order to solve the above-mentioned problems.
(1) A polyurethane elastic yarn containing polyurethane as a main constituent, whose main starting material is a polymer diol and diisocyanate, and containing the following three components (a) to (c).
(A) Thermoplastic polyurethane elastomer (b) Rosin and / or its derivative (c) Cellulose ester and / or its derivative (2) The content of (a) is 0.3% by mass or more and 30% by mass or less. The polyurethane elastic yarn according to (1).
(3) The polyurethane elastic yarn according to (1) or (2) above, wherein the content of (b) is 0.1% by mass or more and 10% by mass or less.
(4) The polyurethane elastic yarn according to any one of (1) to (3) above, wherein the content of (c) is 0.5% by mass or more and 10% by mass or less.
(5) A method for producing a polyurethane elastic yarn, which is spun by containing a thermoplastic polyurethane elastomer, rosin and / or a derivative thereof, a cellulose ester and / or a derivative thereof in a polyurethane spinning stock solution containing a polymer diol and diisocyanate as starting materials.

According to the present invention, a polyurethane elastic yarn having an excellent unwinding property can be obtained in addition to being able to provide a fabric having excellent elasticity and excellent thermal adhesiveness.

Therefore, the fabric using the polyurethane elastic yarn has a higher degree of freedom in the temperature range during processing, and is excellent in appearance quality, wearing feeling and the like. In addition, since the polyurethane elastic yarn of the present invention has very good unwinding property from the winding body, it is possible to suppress yarn breakage during knitting and to withstand unwinding at a high speed. , It will be excellent in productivity.

Hereinafter, the present invention will be described in more detail.

First, the polyurethane used in the present invention will be described.

The polyurethane which is the main constituent component of the polyurethane elastic yarn of the present invention may be any chain extender or end sealant as long as it is a polyurethane whose starting material is a polymer diol and diisocyanate, and is not particularly limited. .. Here, the main constituent component of the polyurethane elastic yarn is a component contained in the polyurethane elastic yarn in an amount of more than 50%, and when the polymer diol and diisocyanate are used as starting materials, the obtained polyurethane polymer is a respective component. It means that it has a structure derived from. That is, in the present specification, the structure of the polyurethane polymer obtained by using the polymer diol and the diisocyanate as starting materials is specified, and the equivalent structure may be formed from different raw materials, and the raw material itself may be used. It is not specific. Similarly, even when synthesizing with the same raw material, the synthesizing method is not particularly limited. That is, for example, it may be a polyurethane urea composed of a polymer diol, a diisocyanate, and a low molecular weight diamine as a chain extender, or it may be a polyurethane urethane composed of a polymer diol, a diisocyanate, and a low molecular weight diol. Further, a polyurethane urea using a compound having a hydroxyl group and an amino group in the molecule as a chain extender may be used. It is also preferable to use polyfunctional glycols, isocyanates and the like having trifunctionality or higher as long as the effects of the present invention are not impaired. In particular, from the viewpoint of thermal adhesion, polyurethane composed of a polymer diol, a diisocyanate and a low molecular weight diol is preferable.

Here, a typical structural unit constituting the polyurethane elastic yarn of the present invention will be described.

The polymer diol used as a starting material for polyurethane in the present invention is preferably a polyether-based diol, a polyester-based diol, a polycarbonate diol, or the like. In particular, it is preferable to use a polyether diol from the viewpoint of imparting flexibility and elongation to the yarn.

Examples of the polyether diol include polyethylene oxide, polyethylene glycol, polyethylene glycol derivatives, polypropylene glycol, polytetramethylene ether glycol (hereinafter abbreviated as PTMG), tetrahydrofuran (THF), and a copolymer of 3-methyltetrahydrofuran. Certain modified PTMGs, modified PTMGs which are copolymers of THF and 2,3-dimethylTHF, polyols having side chains on both sides disclosed in Japanese Patent No. 2615131 and the like, THF and ethylene oxide and / or propylene oxide are not present. Random copolymers and the like arranged in a regular manner are preferably used. One or two or more of these polyether diols may be mixed or copolymerized for use.

Further, from the viewpoint of obtaining abrasion resistance and light resistance as polyurethane elastic yarn, polyester diols such as butylene adipate, polycaprolactone diol, and polyester polyol having a side chain disclosed in JP-A-61-266612 and the like. , Polycarbonate diols disclosed in Japanese Patent Publication No. 2-289516, etc. are preferably used.

Further, such a polymer diol may be used alone, or may be used by mixing or copolymerizing two or more kinds.
The molecular weight of the polymer diol used in the present invention is preferably 1000 or more and 8000 or less, and more preferably 1800 or more and 6000 or less, from the viewpoint of obtaining elongation, strength, heat resistance and the like when made into a yarn. .. By using a polyol having a molecular weight in this range, elastic yarn having excellent elongation, strength, elastic resilience, and heat resistance can be easily obtained.

Next, examples of the diisocyanate used in the present invention include aromatic diisocyanates such as diphenylmethane diisocyanate (hereinafter abbreviated as MDI), toluene diisocyanate, 1,4-diisocyanate benzene, xylylene diisocyanate, and 2,6-naphthalenedi isocyanate. It is particularly suitable for synthesizing polyurethane having high heat resistance and strength. Further, examples of the alicyclic diisocyanate include methylenebis (cyclohexylisocyanate), isophorone diisocyanate, methylcyclohexane2,4-diisocyanate, methylcyclohexane2,6-diisocyanate, cyclohexane1,4-diisocyanate, hexahydroxylylene diisocyanate, and hexahydrotolylene diisocyanate. Isocyanate, octahydro 1,5-naphthalenedi isocyanate and the like are preferable. Aliphatic diisocyanates can be effectively used especially for suppressing yellowing of polyurethane yarns. These diisocyanates may be used alone or in combination of two or more.

Next, as the chain extender in the present invention, it is preferable to use at least one of a low molecular weight diamine and a low molecular weight diol. In addition, those having a hydroxyl group and an amino group such as ethanolamine in the molecule may be used.

Preferred low molecular weight diamines include, for example, ethylenediamine, 1,2-propanediamine, 1,3-propanediamine, hexamethylenediamine, p-phenylenediamine, p-xylylene diamine, m-xylylene diamine, p, p'. -Methylene dianiline, 1,3-cyclohexyldiamine, hexahydromethphenylenediamine, 2-methylpentamethylenediamine, bis (4-aminophenyl) phosphine oxide and the like can be mentioned. It is preferable that one or more of these are used. Ethylenediamine is particularly preferable. By using ethylenediamine, it is possible to easily obtain a yarn having excellent elongation, elasticity recovery, and heat resistance. A triamine compound capable of forming a crosslinked structure, such as diethylenetriamine, may be added to these chain extenders to the extent that the effect is not lost.

Typical low molecular weight diols include ethylene glycol, 1,3 propanediol, 1,4 butanediol, bishydroxyethoxybenzene, bishydroxyethylene terephthalate, and 1-methyl-1,2-ethanediol. be. It is preferable that one or more of these are used. Particularly preferred are ethylene glycol, 1,3 propanediol and 1,4 butanediol. When these are used, the heat resistance of the diol-stretched polyurethane becomes higher, and a yarn having higher strength can be obtained.

Further, the molecular weight of the polyurethane elastic yarn of the present invention is preferably in the range of 30,000 or more and 150,000 or less as a number average molecular weight from the viewpoint of obtaining fibers having high durability and strength. The molecular weight is measured by GPC and converted by polystyrene.

In the present invention, the polyurethane elastic yarn having the above basic structure contains a thermoplastic polyurethane elastomer, rosin and / or a derivative thereof, and a cellulose ester and / or a derivative thereof. By simultaneously containing a thermoplastic polyurethane elastomer and rosin and / or a derivative thereof and a cellulose ester and / or a derivative thereof, excellent thermal adhesive strength and unfoldability can be exhibited without impairing spinnability and stretchability. ..

The thermoplastic polyurethane elastomer in the present invention preferably has a melting point of 70 to 160 ° C. If the melting point is less than 70 ° C., the spinnability is deteriorated and it is easy to stick when wound, which is not preferable. On the contrary, if the melting point exceeds 160 ° C., the desired thermal adhesiveness cannot be obtained unless the heat treatment temperature is raised, which is not preferable.

The thermoplastic polyurethane elastomer of the present invention is preferably adipate-based, ether-based, caprolactone-based, or polycarbonate-based as the polymer diol, and among them, the ether-based thermoplastic polyurethane elastomer is preferable in terms of good spinnability and thermal adhesion. ..

In addition, the content of the thermoplastic polyurethane elastomer in the fiber is in the range of 0.3% by mass or more and 30% by mass or less from the viewpoint of obtaining good spinnability, well-balanced mechanical characteristics, thermal adhesiveness, and heat resistance. It is preferable to do so. That is, if the proportion of the thermoplastic polyurethane elastomer in the polyurethane elastic yarn is less than 0.3% by mass, sufficient thermal adhesiveness cannot be obtained, and if it exceeds 30% by mass, the spinnability and basic physical properties deteriorate. , Not desirable. From the viewpoint of obtaining better heat adhesion and heat resistance, it is more preferably 2% by mass or more and 25% by mass or less, and further preferably less than 20% by mass. It is also preferable to test these contents in advance according to the intended use and determine them as appropriate.

As a method of containing 0.3 to 30% by mass of the thermoplastic polyurethane elastomer in the polyurethane elastic yarn, the above-mentioned thermoplasticity is added to the undiluted spinning solution of polyurethane such as N, N-dimethylformamide and N, N-dimethylacetamide before spinning. A polyurethane elastomer may be added, and the mixture may be stirred and mixed so as to be dispersed or dissolved evenly. Further, the thermoplastic polyurethane elastomer may be uniformly dispersed or dissolved in the same solvent in advance, and then mixed with the polyurethane solution.

When the thermoplastic polyurethane elastomer is insoluble in a solvent such as N, N-dimethylformamide, N, N-dimethylacetamide, it can be dispersed in the polyurethane spinning stock solution in the form of fine particles having an average particle diameter of 10 microns or less.

Further, in the elastic yarn of the present invention, rosin and / or a derivative thereof is contained together with the thermoplastic polyurethane elastomer. The rosin in the present invention is mainly composed of a mixture of abietic acid having a three ring structure, a conjugated double bond and a carboxyl group and an isomer thereof, and is classified as gum rosin or tall oil rosin according to the collection method. Either wood rosin may be used. Examples of the rosin derivative include hydrogenated rosin, disproportionated rosin, maleated rosin, acrylicized rosin, rosin ester, and rosin-containing diol. Further, such rosin and / or its derivative may be used alone or in combination of two or more.

The rosin and / or its derivative preferably has a thermal softening point of 70 ° C. or higher and 150 ° C. or lower in order to develop thermal adhesiveness by heat during processing. In order to measure the thermal softening point of rosin and / or its derivative in the yarn, the following procedure may be carried out. First, the yarn is immersed in a solvent (toluene / acetone, volume ratio 1/1) for 3 hours, and the yarn is taken out. The solvent is then evaporated at room temperature to precipitate rosin and / or its derivatives. The softening point of the precipitated rosin and / or its derivative is measured using a ring-and-ball method according to JIS K5902 (1969). That is, the rosin and / or its derivative was melted in an evaporating dish at a low temperature as much as possible, filled in a ring preheated to an appropriate temperature, allowed to cool, and then raised from a flat surface including the upper end of the ring with a slightly heated knife. Cut out the part. Next, the ring filled with the tackifier resin is fitted into a predetermined hole of the support and placed in a glass container (diameter 85 mm, height 127 mm or more). The liquid temperature of glycerin, which is a heat medium in the glass container, is maintained for 15 minutes so as not to be lower than the predetermined softening point by 45 ° C. or more. Next, a steel ball is placed in the center of the rosin and / or its derivative in the ring and placed in place on the support. Heat while keeping the distance from the upper end of the ring to the glycerin solution at 50 mm or more. The temperature is raised at 5.0 ± 0.5 ° C. per minute from 45 ° C. 45 ° C. before the start of heating, and the temperature at the time of softening and contacting the bottom plate is defined as the softening point.

The content of rosin and / or its derivative in the polyurethane elastic yarn is in the range of 0.1% by mass or more and 10% by mass or less from the viewpoint of obtaining good spinnability, well-balanced mechanical properties, thermal adhesion and heat resistance. Preferably, from the viewpoint of obtaining better heat adhesion and heat resistance, 0.1% by mass or more and 5% by mass or less are more preferable. It is also preferable to test these contents in advance according to the intended use and determine them as appropriate.

Further, the rosin and / or its derivative used in the present invention has 400 Hazen color or less from the viewpoint of obtaining a polyurethane yarn having appropriate transparency and preventing the yarn from being discolored by heat or the like in the spinning process. Is preferable.

Further, the polyurethane elastic yarn of the present invention contains a cellulose ester and / or a derivative thereof. By containing a cellulose ester and / or a derivative thereof in the polyurethane elastic yarn, a polyurethane elastic yarn having excellent thermal adhesiveness and excellent unwinding property can be obtained.
The cellulose ester used in the present invention is a compound obtained by esterifying at least one of the three hydroxyl groups of cellulose with an acid, and is an ester with nitric acid, acetic acid, propionic acid, fatty acid, other higher fatty acids, or the above-mentioned acids. Of these, a mixed ester using a mixed acid of two or more kinds is preferable. Further, from the viewpoint of obtaining good spinnability, as acids, a compound esterified with a mixed acid containing an organic acid having 2 or more and 22 or less carbon atoms is more preferable, and for example, cellulose acetate derived from cellulose and acetic acid, cellulose. Cellulose acetate butyrate derived from acetic acid and butyric acid, cellulose acetate propionate derived from cellulose and acetic acid and propionic acid, and acid-hydroxyl equivalents called cellulose acetate plastics are adjusted to leave some hydroxyl groups. Further, a plastic for molding which contains an adipic acid-based plasticizer or a phthalic acid-based plastic agent in an arbitrary ratio and whose thermal softening point and melt viscosity are appropriately adjusted can also be preferably used. Of these, cellulose acetate butyrate is preferable, and the butyryl group content in the triester is 30% by weight or more, from the viewpoint of improving the unfoldability of the polyurethane elastic yarn.
In the present invention, the content of the cellulose ester and / or its derivative is preferably in the range of 0.5% by mass or more and 10% by mass or less from the viewpoint of obtaining good spinnability, well-balanced mechanical characteristics and heat resistance. The decrease in the melting point of the polyurethane yarn on the high temperature side is small. Further, from the viewpoint of thermal adhesiveness and unresolvability, 0.5% by mass or more and 10% by mass or less is more preferable. It is preferable that these contents are tested in advance according to the intended use and the optimum value is appropriately determined.
Further, the cellulose ester and / or its derivative used in the present invention accelerates dispersion and dissolution in polyurethane, makes the characteristics of the produced polyurethane yarn a target characteristic, and further obtains a polyurethane elastic yarn having appropriate transparency. From the viewpoint of obtaining and preventing the content of cellulose ester and / or its derivative from being lowered or discoloration of the yarn due to heat or the like in the spinning process, a 5 mass% DMAc solution was prepared at 20 ° C. Those having a viscosity in the range of 200 cP or more and 10000 P or less are preferable.

Further, in the polyurethane elastic yarn of the present invention, it is also preferable to use one kind or a mixture of two or more kinds of end-sealing agents. Examples of the terminal blocking agent include monoamines such as dimethylamine, diisopropylamine, ethylmethylamine, diethylamine, methylpropylamine, isopropylmethylamine, diisopropylamine, butylmethylamine, isobutylmethylamine, isopentylmethylamine, dibutylamine and diamylamine. Monool such as ethanol, propanol, butanol, isopropanol, allyl alcohol and cyclopentanol, monoisocyanate such as phenyl isocyanate and the like are preferable.

Further, the polyurethane elastic yarn of the present invention may contain various stabilizers, pigments and the like. For example, as light-resistant agents and antioxidants, hindered phenol-based agents such as BHT and Sumitomo Chemical Industry Co., Ltd.'s "Sumilyzer GA-80", and various benzotriazole-based and benzophenone-based agents such as Ciba Geigy's "Chinubin". , Phosphorus chemicals such as "Sumilyzer P-16" manufactured by Sumitomo Chemical Industries, Ltd., various hindered amine chemicals, various pigments such as iron oxide and titanium oxide, and inorganic substances such as zinc oxide, cerium oxide, magnesium oxide and carbon black. , Fluorine-based or silicone-based resin powder, metal soap such as magnesium stearate, bactericides and deodorants containing silver, zinc and these compounds, and lubricants such as silicone and mineral oil, barium sulfate, oxidation. It is also preferable that various antioxidants such as cerium, betaine and phosphoric acid are contained, and it is also preferable that these are reacted with the polymer. And, in order to further improve the durability to light and various nitrogen oxides, for example, a nitrogen oxide supplement such as HN-150 manufactured by Nippon Hydrazin Co., Ltd., for example, "Smilizer GA" manufactured by Sumitomo Chemical Industry Co., Ltd. It is also preferable to use a thermal oxidation stabilizer such as "-80", for example, a light stabilizer such as "Sumisorb 300 # 622" manufactured by Sumitomo Chemical Industries, Ltd.

Next, the method for producing the polyurethane elastic yarn of the present invention will be described in detail.

In the present invention, a polymer diol and a diisocyanate are used as starting materials, and a thermoplastic polyurethane elastomer and rosin and / or a derivative thereof and a cellulose ester and / or a derivative thereof are contained in a polyurethane spinning stock solution obtained from them for spinning. do. Thermoplastic polyurethane elastomer, rosin and / or its derivative, cellulose ester and / or its derivative may be added together at the polymerization stage of polyurethane, but it is recommended to prepare a polyurethane solution in advance and then add it. preferable.

The method for producing a polyurethane solution and the method for producing polyurethane as a solute of a solution may be either a melt polymerization method or a solution polymerization method, or may be another method. However, a solution polymerization method is more preferable. In the case of the solution polymerization method, foreign matter such as gel is less generated in polyurethane, it is easy to spin, and it is easy to obtain polyurethane elastic yarn with low fineness. Further, as a matter of course, in the case of solution polymerization, there is an advantage that the operation of making a solution can be omitted.
As a polyurethane particularly suitable for the present invention, PTMG having a molecular weight of 1800 or more and 6000 or less as a polymer diol, MDI as a diisocyanate, ethylene glycol as a diol, and at least one of 1,3 propanediol and 1,4 butanediol are used. Examples thereof include those synthesized by using and having a melting point on the high temperature side in the range of 100 ° C. or higher and 260 ° C. or lower.

Polyurethane can be obtained, for example, by synthesizing it in DMAc, DMF, DMSO, NMP or the like or a solvent containing these as a main component using the above raw materials. For example, a so-called one-shot method in which each raw material is put into such a solvent, dissolved, heated to an appropriate temperature and reacted to form polyurethane, or a polymer diol and diisocyanate are first melt-reacted and then reacted. A method of dissolving a substance in a solvent and reacting with the above-mentioned diol to form polyurethane can be adopted as a particularly suitable method.

When a diol is used as a chain extender, a typical method for adjusting the melting point of polyurethane on the high temperature side to a range of 100 ° C. or higher and 260 ° C. or lower is achieved by controlling the types and ratios of polymer diols, MDIs, and diols. obtain. When the molecular weight of the polymer diol is low, a polyurethane having a high melting point at high temperature can be obtained by relatively increasing the proportion of MDI. Similarly, when the molecular weight of the diol is low, the proportion of the polymer diol is relatively high. By reducing the amount, polyurethane having a high high temperature melting point can be obtained.

When the molecular weight of the polymer diol is 1800 or more, in order to raise the melting point on the high temperature side to 100 ° C. or higher, the polymerization should proceed at a ratio of (number of moles of MDI) / (number of moles of polymer diol) = 1.5 or higher. Is preferable.

In synthesizing such polyurethane, it is also preferable to use one or a mixture of two or more catalysts such as an amine-based catalyst and an organometallic catalyst.

Examples of the amine-based catalyst include N, N-dimethylcyclohexylamine, N, N-dimethylbenzylamine, triethylamine, N-methylmorpholin, N-ethylmorpholin, N, N, N', N'-tetramethylethylenediamine, and the like. N, N, N', N'-tetramethyl-1,3-propanediamine, N, N, N', N'-tetramethylhexanediamine, bis-2-dimethylaminoethyl ether, N, N, N' , N', N'-pentamethyldiethylenetriamine, tetramethylguanidine, triethylenediamine, N, N'-dimethylpiperazine, N-methyl-N'-dimethylaminoethyl-piperazine, N- (2-dimethylaminoethyl) morpholine, 1-Methylimidazole, 1,2-dimethylimidazole, N, N-dimethylaminoethanol, N, N, N'-trimethylaminoethylethanolamine, N-methyl-N'-(2-hydroxyethyl) piperazine, 2, Examples thereof include 4,6-tris (dimethylaminomethyl) phenol, N, N-dimethylaminohexanol, and triethanolamine.

Examples of the organometallic catalyst include tin octanate, dibutyltin dilaurate, and lead dibutyl octanate.

The concentration of the polyurethane solution thus obtained is usually preferably in the range of 30% by mass or more and 80% by mass or less.

In the present invention, it is preferable to add a thermoplastic polyurethane elastomer, rosin and / or a derivative thereof, a cellulose ester and / or a derivative thereof to the polyurethane solution. Any method can be adopted as a method for adding the thermoplastic polyurethane elastomer, rosin, its derivative, and the cellulose ester and / or its derivative to the polyurethane solution. As a typical method, various means such as a method using a static mixer, a method by stirring, a method using a homomixer, and a method using a two-screw extruder can be adopted. Here, the thermoplastic polyurethane elastomer and rosin and its derivative and the cellulose ester and / or its derivative to be added are preferably added as a solution from the viewpoint of uniform addition to the polyurethane solution.

When the thermoplastic polyurethane elastomer and rosin and / or its derivative and the cellulose ester and / or its derivative are added to the polyurethane solution, the above-mentioned chemicals such as light-resistant agent and antioxidant and pigments are simultaneously applied. It may be added.

The polyurethane yarn of the present invention can be obtained by, for example, dry-spinning, wet-spinning, or melt-spinning and winding the undiluted spinning solution constructed as described above. Of these, dry spinning is preferable from the viewpoint of stable spinning at all finenesses from fine to thick.

The fineness, cross-sectional shape, etc. of the polyurethane elastic yarn of the present invention are not particularly limited. For example, the cross-sectional shape of the thread may be circular or flat.

The dry spinning method is also not particularly limited, and spinning may be performed by appropriately selecting spinning conditions and the like suitable for desired characteristics and spinning equipment.

For example, the permanent strain rate and stress relaxation of the polyurethane elastic yarn of the present invention are particularly susceptible to the speed ratio between the Gode roller and the winder, and are therefore preferably determined as appropriate according to the intended use of the yarn.

That is, from the viewpoint of obtaining a polyurethane yarn having a desired permanent strain rate and stress relaxation, it is preferable that the speed ratio between the Gode roller and the winder is in the range of 1.10 or more and 1.65 or less. Further, when obtaining a polyurethane yarn having a particularly low permanent strain rate and low stress relaxation, the speed ratio between the Gode roller and the winder is more preferably in the range of 1.15 or more and 1.4 or less, and 1.15 or more 1 A range of .35 or less is more preferred. On the other hand, when obtaining a polyurethane yarn having a high permanent strain rate and high stress relaxation, the speed ratio between the Gode roller and the winder is preferably in the range of 1.25 or more and 1.65 or less, and 1.35. The range of 1.65 or less is more preferable.

The spinning speed is preferably 300 m / min or more from the viewpoint of improving the strength of the obtained polyurethane elastic yarn.

The polyurethane elastic yarn obtained as described above is used, for example, when producing a fabric together with other fibers. Examples of other fibers used together with polyurethane elastic yarns for producing a fabric include polyamide fibers and polyester fibers.

Here, the polyamide fiber is a fiber typified by nylon 6 fiber and nylon 66 fiber, but is not limited thereto. The polyester fiber includes polyethylene terephthalate, polytrimethylene terephthalate, polytetramethylene terephthalate, an ester-based copolymer containing polytetramethylene glycol and ethylene glycol as main components as diol components, and their cationic dyeable modified polyesters. It is a fiber composed of polyester.

It is preferable that the cloth is mainly composed of these polyamide fibers or polyester fibers and the polyurethane yarn of the present invention from the viewpoint of processability and durability of the cloth, but from the viewpoint of polyacrylic type, polyvinyl chloride type and the like. It is also preferable to use a natural fiber material such as synthetic fiber, regenerated cellulose fiber made of copper ammonia rayon, viscous rayon, and purified cellulose, regenerated protein fiber, semi-synthetic fiber, cotton, silk, and wool.

Further, the polyurethane elastic yarn in the fabric may be used in the state of bare yarn, core spun yarn covered with other fibers, air covering yarn, twisted yarn with other fibers, twisted yarn, interlaced yarn, etc. It may be used in the state of the composite yarn of. Further, the fabric composed of the polyurethane elastic yarn and other fibers may be a knitted fabric composed of the above composite yarns, or may be used with other fibers in knitting such as warp knitting, circular knitting, and weft knitting. It may be interwoven.

When the fabric is a knitted fabric, it may be warp knit or weft knit, and examples thereof include tricot, Russell, and circular knit. The knitting structure may be any of half knitting, reverse half knitting, double atlas knitting, double denby knitting, etc., but the surface of the knitted fabric shall be composed of natural fibers other than polyurethane yarn, chemical fibers, and synthetic fibers. Is preferable in terms of texture.

The present invention will be described in more detail with reference to examples. First, a method for evaluating various characteristics in the present invention will be described.

[Analysis method of rosin and / or its derivative in yarn]
The yarn was immersed in a solvent (toluene / acetone, volume ratio 1/1) for 3 hours, and the solvent was measured with an IR meter. From the absorption around 1580 cm-1, the content in the yarn was determined by a calibration curve using a known solvent concentration solvent.

[Thermal adhesiveness]
Two test threads 1 sampled to a length of about 10 cm (both ends are tied and fixed) are entangled at the center as shown in FIG. 1 and fixed to the metal frame 2 with an interval of 1 cm (a). In a state where each test yarn 1 is stretched so as to be stretched by 30%, dry heat treatment is performed for 1 minute at each temperature shown in the table (b). After the treatment, the sample is removed from the metal frame 2 so that the two are in contact with each other only by the adhesive portion 3 (c). Grab and set according to. The maximum stress at which the tensile adhesive is peeled off is measured at 50 cm / min and divided by the fineness of the polyurethane elastic fiber sample.

Further, the cutting point is confirmed, and the case where the cutting point is cut at the intersection is determined as X, and the case where the cutting point is cut at other points is determined as Y. When it is cut at a point other than the intersection, it indicates that the strength of the adhesive point is equal to or higher than the breaking strength and has excellent thermal adhesiveness.

[Strength, stress relaxation, permanent distortion, elongation]
The strength, stress relaxation, permanent strain rate, and elongation were measured by performing a tensile test on the sample yarn with an Instron 5965 type tensile tester.

These are defined below.

That is, a 5 cm (L1) sample was repeatedly stretched by 300% 5 times at a tensile rate of 50 cm / min. This fifth stress was defined as (G1). Next, the 300% elongation was held as it was for 30 seconds. The stress after holding for 30 seconds was defined as (G2). Next, the length of the sample yarn when the elongation was restored and the stress became 0 was defined as (L2). Further, it was stretched until the sample yarn was cut at the sixth time. The stress at the time of breaking was defined as (G3), and the length of the sample yarn at the time of breaking was defined as (L3).

Hereinafter, the above characteristics are given by the following formula.

Strength = (G3)
Stress relaxation = 100 × ((G1)-(G2)) / (G1)
Permanent distortion = 100 × ((L2)-(L1)) / (L1)
Elongation = 100 × ((L3)-(L1)) / (L1).

[Unwinding of the winding body]
After leaving the 200 g wound yarn of polyurethane elastic yarn in an atmosphere of 25 ° C. and 65% RH for 14 days and 56 days, the wound yarn is peeled off from the winding paper tube to a position of 1 to 2 mm, and the wound yarn is peeled off. The surface of the body was placed so as to be in contact with the satin roller (a), and the polyurethane elastic yarn was sent out at a roller surface speed of 30 m / min while rotating the roller. The sent out polyurethane elastic yarn is run around a satin-finished roller (b) of the same diameter installed at a distance of 100 cm, and the surface speed of the roller (b) is gradually changed to gradually change the surface speed of the roller (b) from the roller (a) to the polyurethane. When the elastic yarn is pulled apart, the speed of the roller (b) that is smoothly sent out without being lifted by the winding body of the polyurethane elastic yarn is obtained, and the speed ratio (b) / (a) of the roller is set to that of the polyurethane elastic yarn. It was made to be elastic. The smaller the value, the better the unwindability of the polyurethane elastic yarn.

The unwindability test was performed using two wound yarns and evaluated by an average value.

[Example 1]
(Preparation of polymer solution)
A DMAC solution (35% by mass) of a polyurethane urea polymer consisting of PTMG, MDI, ethylenediamine having a molecular weight of 1800 and diethylamine as a terminal blocking agent was prepared.
Next, as an antioxidant, a polyurethane solution (“Metachlor” (registered trademark) 2462D manufactured by DuPont) produced by the reaction of t-butyldiethanolamine and methylene-bis- (4-cyclohexylisosianate) was used. , P-cresol and a condensation polymer of divinylbenzene ("Metachlor" (registered trademark) 2390D manufactured by DuPont) are mixed in a ratio of 2: 1 (mass ratio), and a DMAc solution of an antioxidant (concentration 35 mass) is mixed. %) Was adjusted.
97 parts by mass of the DMAc solution of the polyurethane urea polymer and 3 parts by mass of the DMAc solution of the antioxidant were mixed to obtain a polymer solution P1.
(Preparation of thermoplastic polyurethane elastomer solution)
A DMAc solution (35% by mass) of thermoplastic polyurethane "Pandex" (registered trademark) T-8175N manufactured by DIC Covestro Co., Ltd. was adjusted by stirring at 60 ° C. to obtain a thermoplastic polyurethane elastomer solution (A1).
(Preparation of rosin solution)
A DMAc solution (35% by mass) of rosin manufactured by Arakawa Chemical Co., Ltd. (product name: Pine Crystal (R) KR-614, softening point 86 ° C.) was stirred and adjusted at 25 ° C. to prepare a rosin solution (B1).
(Preparation of cellulose ester solution)
A DMAc solution (35% by mass) of a cellulose ester manufactured by EASTMAN (product name: Eastman ^TM Cellulose Activate Butyrate (CAB-551-0.2)) was adjusted by stirring at 25 ° C. to obtain a cellulose ester solution (C1). ..
(Preparation of undiluted spinning solution)
-Polymer solutions P1, A1, B1 and C1 were uniformly mixed at 88% by mass, 8% by mass, 1% by mass and 3% by mass to obtain a spinning solution D1.
(Manufacturing of polyurethane elastic yarn)
The spinning solution D1 was dry-spun at a speed of 490 m / min with a speed ratio of 1.3 between the Gode roller and the winder. At the time of winding, 3% by mass of a silicone-based oil having a viscosity of 25 mm ² / s was applied, 22 decitex, 2 filaments, a thermoplastic polyurethane elastomer content of 8% by mass, a rosin content of 1% by mass, and a cellulose ester content. A 200 g wound body of polyurethane yarn having an amount of 3% by mass was obtained.

With respect to the obtained polyurethane elastic yarn, elongation, strength, permanent strain rate, stress relaxation, thermal adhesion and unwinding property of the wound yarn were measured. The results are shown in Table 1. The obtained polyurethane elastic yarn had a good balance of thermal adhesiveness and defibration property after aging.
[Example 2]
(Adjustment of undiluted spinning solution)
-Polymer solutions P1, A1, B1 and C1 were uniformly mixed at 76% by mass, 16% by mass, 2% by mass and 6% by mass to obtain a spinning solution D2.
(Manufacturing of polyurethane elastic yarn)
The spinning solution D2 was dry-spun at a speed of 490 m / min with a speed ratio of 1.3 between the Gode roller and the winder. At the time of winding, 3% by mass of a silicone-based oil having a viscosity of 25 mm ² / s was applied, 22 decitex, 2 filaments, a thermoplastic polyurethane elastomer content of 16% by mass, a rosin content of 2% by mass, and a cellulose ester content. A 200 g wound body of polyurethane yarn having an amount of 6% by mass was obtained.

The obtained polyurethane elastic yarns were measured for elongation, strength, permanent strain rate, stress relaxation, thermal adhesiveness and unfoldability. The results are shown in Table 1. The obtained polyurethane elastic yarn had a good balance of thermal adhesiveness and defibration property after aging.
[Example 3]
(Adjustment of undiluted spinning solution)
-Polymer solutions P1, A1, B1 and C1 were uniformly mixed at 68% by mass, 24% by mass, 2% by mass and 6% by mass to prepare a spinning solution D3.
(Manufacturing of polyurethane elastic yarn)
The spinning solution D3 was dry-spun at a speed of 490 m / min with a speed ratio of 1.3 between the Gode roller and the winder. At the time of winding, 3% by mass of a silicone-based oil having a viscosity of 25 mm ² / s was applied, 22 decitex, 2 filaments, a thermoplastic polyurethane elastomer content of 24% by mass, a rosin content of 2% by mass, and a cellulose ester content. A 200 g wound body of polyurethane yarn having an amount of 6% by mass was obtained.

The obtained polyurethane elastic yarns were measured for elongation, strength, permanent strain rate, stress relaxation, thermal adhesiveness and unfoldability. The results are shown in Table 1. The obtained polyurethane elastic yarn had a good balance of thermal adhesiveness and defibration property after aging.
[Example 4]
(Adjustment of undiluted spinning solution)
-Polymer solutions P1, A1, B1 and C1 were uniformly mixed at 60% by mass, 32% by mass, 6% by mass and 2% by mass to obtain a spinning solution D4.
(Manufacturing of polyurethane elastic yarn)
-The spinning solution D4 was dry-spun at a speed of 490 m / min with a speed ratio of 1.3 between the Gode roller and the winder. At the time of winding, 3% by mass of a silicone-based oil having a viscosity of 25 mm ² / s was applied, 22 decitex, 2 filaments, a thermoplastic polyurethane elastomer content of 32% by mass, a rosin content of 6% by mass, and a cellulose ester content. A 200 g wound body of polyurethane yarn having an amount of 2% by mass was obtained.

The obtained polyurethane elastic yarns were measured for elongation, strength, permanent strain rate, stress relaxation, thermal adhesiveness and unfoldability. The results are shown in Table 1. The obtained polyurethane elastic yarn had a good balance of thermal adhesiveness and defibration property after aging.

[Example 5]
(Preparation of polymer solution)
A DMAC solution (35% by weight) of a polyurethane polymer consisting of PTMG, MDI, ethylene glycol having a molecular weight of 2000 and 1-butanol as a terminal sequestering agent was prepared.
Next, as an antioxidant, a polyurethane solution (“Metachlor” (registered trademark) 2462D manufactured by DuPont) produced by the reaction of t-butyldiethanolamine and methylene-bis- (4-cyclohexylisosianate) was used. , P-cresol and a condensation polymer of divinylbenzene ("Metachlor" (registered trademark) 2390D manufactured by DuPont) are mixed in a ratio of 2: 1 (mass ratio), and a DMAc solution of an antioxidant (concentration 35 mass) is mixed. %) Was adjusted.
96 parts by mass of the DMAc solution of the polyurethane polymer and 4 parts by mass of the antioxidant solution were mixed to obtain a polyma solution P2.
(Preparation of undiluted spinning solution)
-Polymer solutions P2, A1, B1 and C1 were uniformly mixed at 88% by mass, 8% by mass, 3% by mass and 1% by mass to obtain a spinning solution D5.
(Manufacturing of polyurethane elastic yarn)
-Spinning solution D5 was dry-spun at a speed of 450 m / min with a speed ratio of 1.3 between the Gode roller and the winder. At the time of winding, 3% by mass of a silicone-based oil having a viscosity of 25 mm ² / s was applied, and the content of 20 decitex, monofilament, thermoplastic polyurethane elastomer was 8% by mass, the content of rosin was 1% by mass, and the content of cellulose ester. A 200 g wound body of polyurethane yarn having a mass content of 3% by mass was obtained.

The obtained polyurethane elastic yarns were measured for elongation, strength, permanent strain rate, stress relaxation, thermal adhesiveness and unfoldability. The results are shown in Table 1. The obtained polyurethane elastic yarn had a good balance of thermal adhesiveness and defibration property after aging.

[Example 6]
(Adjustment of undiluted spinning solution)
-Polymer solutions P2, A1, B1 and C1 were uniformly mixed at 90.5% by mass, 8% by mass, 1% by mass and 0.5% by mass to obtain a spinning solution D6.
(Manufacturing of polyurethane elastic yarn)
The spinning solution D6 was dry-spun at a speed of 490 m / min with a speed ratio of 1.3 between the godder roller and the winder. At the time of winding, 3% by mass of a silicone-based oil having a viscosity of 25 mm ² / s was applied, and the content of 20 decitex, monofilament, thermoplastic polyurethane elastomer was 8% by mass, the content of rosin was 1% by mass, and the content of cellulose ester. A 200 g wound body of polyurethane yarn having a content of 0.5% by mass was obtained.

The obtained polyurethane elastic yarns were measured for elongation, strength, permanent strain rate, stress relaxation, thermal adhesiveness and unfoldability. The results are shown in Table 1. The obtained polyurethane elastic yarn had a good balance of thermal adhesiveness and defibration property after aging.

[Example 7]
(Preparation of undiluted spinning solution)
-Polymer solutions P2, A1, B1 and C1 were uniformly mixed at 85% by mass, 8% by mass, 1% by mass and 6% by mass to prepare a spinning solution D7.
(Manufacturing of polyurethane elastic yarn)
The spinning solution D7 was dry-spun at a speed of 490 m / min with a speed ratio of 1.3 between the Gode roller and the winder. At the time of winding, 3% by mass of a silicone-based oil having a viscosity of 25 mm ² / s was applied, and the content of 20 decitex, monofilament, thermoplastic polyurethane elastomer was 8% by mass, the content of rosin was 1% by mass, and the content of cellulose ester. A 200 g wound body of polyurethane yarn having a weight of 6% by mass was obtained.

The obtained polyurethane elastic yarns were measured for elongation, strength, permanent strain rate, stress relaxation, thermal adhesiveness and unfoldability. The results are shown in Table 1. The obtained polyurethane elastic yarn had a good balance of thermal adhesiveness and defibration property after aging.

[Comparative Example 1]
(Preparation of undiluted spinning solution)
-Polymer solutions P2 and A1 were uniformly mixed at 92% by mass and 8% by mass to obtain a spinning solution E1.
(Manufacturing of polyurethane elastic yarn)
-The spinning solution E1 was dry-spun at a speed of 450 m / min with a speed ratio of 1.3 between the goderoller and the winder. At the time of winding, a silicone-based oil having a viscosity of 25 mm ² / s was applied in an amount of 3% by mass to obtain a 200 g wound body of a polyurethane yarn having a content of 20 decitex, a monofilament and a thermoplastic polyurethane elastomer of 8% by mass.

The obtained polyurethane elastic yarns were measured for elongation, strength, permanent strain rate, stress relaxation, thermal adhesiveness and unfoldability. The results are shown in Table 1.

[Comparative Example 2]
(Preparation of undiluted spinning solution)
-Polymer solutions P2 and B1 were uniformly mixed at 99% by mass and 1% by mass to obtain a spinning solution E2.
(Manufacturing of polyurethane elastic yarn)
-The spinning solution E2 was dry-spun at a speed of 450 m / min with a speed ratio of 1.3 between the goderoller and the winder. At the time of winding, a silicone-based oil having a viscosity of 25 mm and ² / s was applied in an amount of 3% by mass to obtain a 200 g wound body of a polyurethane yarn having a content of 20 decitex, monofilament and rosin of 1% by mass.

The obtained polyurethane elastic yarns were measured for elongation, strength, permanent strain rate, stress relaxation, thermal adhesiveness and unfoldability. The results are shown in Table 1.

[Comparative Example 3]
(Preparation of undiluted spinning solution)
-Polymer solutions P2 and C1 were uniformly mixed at 99% by mass and 3% by mass to prepare solution E3.
(Manufacturing of polyurethane elastic yarn)
-The spinning solution E3 was dry-spun at a speed of 450 m / min with a speed ratio of 1.3 between the Gode roller and the winder. At the time of winding, a silicone-based oil having a viscosity of 25 mm ² / s was applied in an amount of 3% by mass to obtain a 200 g wound body of a polyurethane yarn having a content of 20 decitex, a monofilament and a cellulose ester of 3% by mass.

The obtained polyurethane elastic yarns were measured for elongation, strength, permanent strain rate, stress relaxation, thermal adhesiveness and unfoldability. The results are shown in Table 1.

[Comparative Example 4]
(Preparation of undiluted spinning solution)
-Polymer solutions P2, A1 and B1 were uniformly mixed at 91% by mass, 8% by mass and 1% by mass to prepare solution E4.
(Manufacturing of polyurethane elastic yarn)
-The spinning solution E4 was dry-spun at a speed of 450 m / min with a speed ratio of 1.3 between the goderoller and the winder. 200 g of polyurethane yarn having a viscosity of 25 mm ² / s of a silicone oil at the time of winding in an amount of 3% by mass, a content of 20 decitex, a monofilament and a thermoplastic polyurethane elastomer of 8% by mass and a content of rosin of 1% by mass. A winding body was obtained.

The obtained polyurethane elastic yarns were measured for elongation, strength, permanent strain rate, stress relaxation, thermal adhesiveness and unfoldability. The results are shown in Table 1.

[Comparative Example 5]
(Preparation of undiluted spinning solution)
-Polymer solutions P2, B1 and C1 were uniformly mixed at 96% by mass, 1% by mass and 3% by mass to prepare solution E5.
(Manufacturing of polyurethane elastic yarn)
-The spinning solution E5 was dry-spun at a speed of 450 m / min with a speed ratio of 1.3 between the goderoller and the winder. 200 g of polyurethane yarn with a viscosity of 25 mm ² / s silicone oil applied at the time of winding in an amount of 3% by mass, a content of 20 decitex, monofilament and rosin of 1% by mass and a content of cellulose ester of 3% by mass. I got a body.

The obtained polyurethane elastic yarns were measured for elongation, strength, permanent strain rate, stress relaxation, thermal adhesiveness and unfoldability. The results are shown in Table 1.

[Comparative Example 6]
(Preparation of undiluted spinning solution)
-Polymer solutions P2, A1 and C1 were uniformly mixed at 89% by mass, 8% by mass and 3% by mass to prepare solution E6.
(Manufacturing of polyurethane elastic yarn)
-The spinning solution E6 was dry-spun at a speed of 450 m / min with a speed ratio of 1.3 between the goderoller and the winder. A polyurethane yarn containing 3% by mass of a silicone-based oil having a viscosity of 25 mm ² / s at the time of winding, and having a content of 20 decitex, monofilament, and a thermoplastic polyurethane elastomer of 8% by mass and a cellulose ester content of 3% by mass. A 200 g winding body was obtained.

The obtained polyurethane elastic yarns were measured for elongation, strength, permanent strain rate, stress relaxation, thermal adhesiveness and unfoldability. The results are shown in Table 1.

[Comparative Example 7]
(Preparation of undiluted spinning solution)
-Polymer solutions P2, A1 and B1 were uniformly mixed at 91% by mass, 8% by mass and 1% by mass to prepare solution E7.
(Manufacturing of polyurethane elastic yarn)
-The spinning solution E7 was dry-spun at a speed of 450 m / min with a speed ratio of 1.3 between the goderoller and the winder. A polyurethane yarn having a viscosity of 25 mm ² / s and a viscosity of 3% by mass at the time of winding, 22 decitex, 2 filaments, a content of 8% by mass of a thermoplastic polyurethane elastomer, and a content of 1% by mass of rosin. A 200 g winding body was obtained.

The obtained polyurethane elastic yarns were measured for elongation, strength, permanent strain rate, stress relaxation, thermal adhesiveness and unfoldability. The results are shown in Table 1.

In the table, "rosin and / or its derivative" and "cellulose ester and / or its derivative" are abbreviated as "rosin" and "cellulose ester", respectively.

By using the polyurethane elastic yarn of the present invention, it is possible to provide clothes having excellent detachability, fit, appearance quality, wearing feeling and the like. Further, since the heat adhesiveness is developed by the heat during processing, fraying of the edges of the fabric is suppressed, and a high-quality fabric with few restrictions on processing can be obtained. Due to these excellent properties, the polyurethane elastic yarn of the present invention can be used alone or in combination with various fibers, for example, socks, stockings, circular knitting, tricots, swimwear, ski trousers, work clothes, etc. It is possible to provide products with excellent wearing feeling and appearance quality in tightening materials for various textile products such as smoke fire clothes, clothes, golf trousers, wet suits, brassieres, girdles, gloves and socks. The polyurethane elastic thread of the present invention can also be used for various purposes such as leak-preventing tightening materials for sanitary products such as disposable diapers, tightening materials for waterproof materials, imitation baits, artificial flowers, electrical insulating materials, wiping cloths, copy cleaners, and gaskets. It is possible to use.

It is a schematic diagram which shows the measuring method of the thermal adhesive force of a polyurethane elastic yarn.

1 Test thread 2 Gold frame 3 Adhesive part

Claims (5)

A polyurethane elastic yarn whose main constituent is polyurethane whose main starting material is a polymer diol and diisocyanate, and which contains the following three components (a) to (c).
(A) Thermoplastic polyurethane elastomer (b) Rosin and / or its derivative (c) Cellulose ester and / or its derivative The polyurethane elastic yarn according to claim 1, wherein the content of (a) is 0.3% by mass or more and 30% by mass or less. The polyurethane elastic yarn according to claim 1 or 2, wherein the content of (b) is 0.1% by mass or more and 10% by mass or less. The polyurethane elastic yarn according to any one of claims 1 to 3, wherein the content of (c) is 0.5% by mass or more and 10% by mass or less. A method for producing a polyurethane elastic yarn, which is spun by containing a thermoplastic polyurethane elastomer, rosin and / or a derivative thereof, a cellulose ester and / or a derivative thereof in a polyurethane spinning stock solution containing a polymer diol and diisocyanate as starting materials.

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