JP4867907B2 - Polyurethane yarn and method for producing the same - Google Patents

Description

  The present invention relates to a polyurethane yarn having high heat resistance, high heat setting properties, and good return characteristics after heat setting.

  Elastic fibers are widely used for stretchable clothing and industrial materials such as legwear, innerwear, and sportswear because of their excellent stretch properties. As such elastic fibers, in particular, polyurethane elastic fibers have conventionally been required to have high heat resistance, high heat setting properties, and good return characteristics after heat setting.

  Patent Document 1 discloses a technique for alkali-treating a polyurethane yarn containing cellulose acetate, but it is not satisfactory with respect to high heat setting properties and high heat resistance. Further, Patent Document 2 discloses a technique regarding a polyurethane yarn containing polyvinylpyrrolidone, but it reduces the high heat resistance in which polyurethane is inherently easily developed. Further, Patent Document 3 discloses a technique regarding a polyurethane yarn containing a cellulose ester, but it is not satisfactory with respect to the return characteristics after heat setting.

Therefore, there has been a demand for a polyurethane yarn that exhibits heat resistance and a good balance between heat setability and good return characteristics after heat set.
JP 2000-303259 A JP-A-11-200137 Japanese Patent Laying-Open No. 2005-048306

  An object of the present invention is to provide a polyurethane yarn that exhibits heat resistance and a good balance between heat setability and good return characteristics after heat set, 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 problems.
(1) A polyurethane yarn characterized in that main constituent components are a polymer diol and a diisocyanate, and contain rosin and / or a derivative thereof having a Hazen color of 400 or less .
(2) The polyurethane yarn as described in (2) above, wherein the rosin and / or derivative thereof has a heat softening point of 70 ° C. or higher and 150 ° C. or lower.
(3) The polyurethane yarn according to (1) or (2) above, wherein the content of the rosin and / or derivative thereof is 0.1% by weight or more and 20% by weight or less.
(4) A method for producing a polyurethane yarn, characterized in that when producing a polyurethane yarn whose main constituent components are a polymer diol and a diisocyanate, spinning is carried out by containing a rosin of 400 Hazen color or less and / or a derivative thereof.
(5) The method for producing a polyurethane yarn according to (4), wherein the spinning method is a dry method.

According to the present invention, the polyurethane yarn whose main constituents are polymer diol and diisocyanate contains rosin and / or a derivative thereof having a Hazen color of 400 or less. The subsequent good return characteristics can be expressed in a balanced manner. Therefore, a garment using such polyurethane yarn has excellent detachability, fit, appearance quality, feeling of wearing, and the like.

  The present invention is described in further detail below.

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

  The polyurethane used in the present invention is not particularly limited as long as it is a polyurethane whose main components are a polymer diol and a diisocyanate. Also, the synthesis method is not particularly limited. That is, for example, it may be a polyurethane urea composed of a polymer diol, a diisocyanate and a diamine, or may be a polyurethane composed of a polymer diol, a diisocyanate and a diol. Moreover, the polyurethane urea which uses the compound which has a hydroxyl group and an amino group in a molecule | numerator as a chain extender may be used. It is also preferable to use trifunctional or higher polyfunctional glycol or isocyanate or the like as long as the effects of the present invention are not hindered.

  The “main constituent component” means a component occupying 50% by weight or more of the constituent components of the polyurethane, and in the present invention, it means that the polymer diol and diisocyanate occupy 50% by weight or more in total. .

  Here, typical structural units constituting the polyurethane yarn of the present invention will be described.

  The polymer diol used in the present invention is preferably a polyether diol, a polyester diol, a polycarbonate diol, or the like. In particular, a polyether diol is preferably used from the viewpoint of imparting flexibility and elongation to the yarn.

  Examples of polyether glycols include polyethylene oxide, polyethylene glycol, polyethylene glycol derivatives, polypropylene glycol, polytetramethylene ether glycol (hereinafter abbreviated as PTMG), modified PTMG (which is a copolymer of THF and 3-MeTHF ( Hereinafter, abbreviated as 3M-PTMG), modified PTMG which is a copolymer of THF and 2,3-dimethyl THF, a polyol having side chains on both sides disclosed in Japanese Patent No. 2615131, THF and ethylene oxide, Random copolymers in which propylene oxide is irregularly arranged are preferably used. These polyether glycols may be used alone or in combination of two or more.

  Further, from the viewpoint of obtaining abrasion resistance and light resistance as a polyurethane yarn, polyester glycols such as butylene adipate, polycaprolactone diol, polyester polyol having a side chain disclosed in JP-A No. 61-26612, and the like, Polycarbonate diols disclosed in JP-B-2-289516 and the like are preferably used.

  These polymer diols may be used alone or in combination of two or more.

  The molecular weight of the polymer diol used in the present invention is preferably a number average molecular weight of 1000 or more and 8000 or less, more preferably 1800 or more and 6000 or less, from the viewpoint of obtaining elongation, strength, heat resistance, etc. . By using a polyol having a molecular weight within this range, an elastic yarn excellent in elongation, strength, elastic recovery, and heat resistance can be easily obtained.

  Next, as the diisocyanate used in the present invention, aromatic diisocyanates such as diphenylmethane diisocyanate (hereinafter abbreviated as MDI), tolylene diisocyanate, 1,4-diisocyanate benzene, xylylene diisocyanate, 2,6-naphthalene diisocyanate, It is particularly suitable for synthesizing polyurethane having high heat resistance and high strength. Further, as the alicyclic diisocyanate, for example, methylene bis (cyclohexyl isocyanate) (hereinafter referred to as H12MDI), isophorone diisocyanate, methylcyclohexane 2,4-diisocyanate, methylcyclohexane 2,6-diisocyanate, cyclohexane 1,4-diisocyanate, hexa Hydroxylylene diisocyanate, hexahydrotolylene diisocyanate, octahydro 1,5-naphthalene diisocyanate and the like are preferable. Aliphatic diisocyanates can be used effectively particularly when suppressing yellowing of polyurethane yarns. And these diisocyanates may be used independently and may use 2 or more types together.

  Next, it is preferable to use at least one of a low molecular weight diamine and a low molecular weight diol as the chain extender in the present invention. In addition, you may have a hydroxyl group and amino groups in a molecule like ethanolamine.

  Preferred low molecular weight diamines include, for example, ethylenediamine, 1,2-propanediamine, 1,3-propanediamine, hexamethylenediamine, p-phenylenediamine, p-xylylenediamine, m-xylylenediamine, p, p ′. -Methylenedianiline, 1,3-cyclohexyldiamine, hexahydrometaphenylenediamine, 2-methylpentamethylenediamine, bis (4-aminophenyl) phosphine oxide and the like. It is also preferred that one or more of these are used. Particularly preferred is ethylenediamine. By using ethylenediamine, a yarn excellent in elongation, elastic recovery, and heat resistance can be easily obtained. You may add the triamine compound which can form a crosslinked structure in these chain extenders, for example, diethylenetriamine, etc. to such an extent that an effect is not lost.

  Typical low molecular weight diols include ethylene glycol, 1,3 propanediol, 1,4 butanediol, bishydroxyethoxybenzene, bishydroxyethylene terephthalate, 1-methyl-1,2-ethanediol, and the like. is there. It is also preferred 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 diol-extended polyurethane has higher heat resistance, and a yarn having higher strength can be obtained.

  Further, the molecular weight of the polyurethane yarn of the present invention is preferably in the range of 30000 to 150,000 as the number average molecular weight from the viewpoint of obtaining a fiber having durability and high strength. The molecular weight is measured by GPC and converted by polystyrene.

  In the present invention, the polyurethane yarn having the basic structure as described above contains rosin and / or a derivative thereof. If it does not contain rosin and / or a derivative thereof, there arises a problem that high heat setting properties and excellent mechanical properties after heat setting cannot be obtained.

  The rosin in the present invention is mainly composed of a mixture of abietic acid having three ring structures, a conjugated double bond, and a carboxyl group and its isomer, and as a classification from the collection method, gum rosin, tall oil rosin, Either wood rosin may be used. Examples of the rosin derivative include hydrogenated rosin, disproportionated rosin, maleated rosin, acrylated rosin, rosin ester, and rosin-containing diol. Such rosins and derivatives thereof may be used alone or in combination of two or more.

  And in order to provide better heat-setting property in the higher-order processing step of the polyurethane yarn, it is preferable that the heat softening point of the rosin or its derivative contained is in the range of 70 ° C. or higher and 150 ° C. or lower.

  In the present invention, the content of rosin and / or a derivative thereof is preferably in the range of 0.1% by weight or more and 20% by weight or less from the viewpoint of obtaining good spinnability, well-balanced mechanical properties, and heat resistance. From the viewpoint of obtaining good heat setting properties and heat resistance, it is more preferably 0.3% by weight or more and 10% by weight or less. In addition, it is also preferable that these contents are suitably determined by testing in advance according to the use.

Furthermore, the rosin and its derivatives used in the present invention are those having 400 Hazen colors or less from the viewpoint of obtaining a polyurethane yarn having an appropriate transparency and preventing the yarn from being discolored by receiving heat in the spinning process. It is .

  Furthermore, it is also preferable that one or more end blockers are used in the polyurethane yarn of the present invention. As end-capping agents, dimethylamine, diisopropylamine, ethylmethylamine, diethylamine, methylpropylamine, isopropylmethylamine, diisopropylamine, butylmethylamine, isobutylmethylamine, isopentylmethylamine, dibutylamine, diamylamine and other monoamines, ethanol Monools such as propanol, butanol, isopropanol, allyl alcohol and cyclopentanol, and monoisocyanates such as phenyl isocyanate are preferred.

  The polyurethane yarn of the present invention may contain various stabilizers and pigments. For example, hindered phenolic agents such as BHT and Sumitomo Chemical Co., Ltd. “Sumilyzer GA-80”, and various benzotriazole and benzophenone agents such as “Tinubin” manufactured by Ciba Geigy Co., Ltd. , Sumitomo Chemical Co., Ltd. "Sumilyzer P-16" and other phosphorous agents, various hindered amine agents, various pigments such as iron oxide and titanium oxide, inorganic substances such as zinc oxide, cerium oxide, magnesium oxide and carbon black , Fluorine or silicone resin powders, metal soaps such as magnesium stearate, bactericides, deodorizers including silver, zinc and their compounds, lubricants such as silicone and mineral oil, barium sulfate, oxidation It is also preferable that various antistatic agents such as cerium, betaine and phosphate are included. Properly, It is also preferred that they are reacted with the polymer. In order to further enhance the durability to light and various nitric oxides, for example, a nitric oxide supplement such as HN-150 manufactured by Nippon Hydrazine Co., Ltd., for example, “Sumilyzer GA manufactured by Sumitomo Chemical 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 Co., Ltd.

  Next, the manufacturing method of the polyurethane yarn of this invention is demonstrated in detail.

  In the present invention, when producing a polyurethane yarn whose main constituents are a polymer diol and a diisocyanate, spinning is carried out by containing rosin and / or a derivative thereof. Rosin and its derivatives may be added together in the polymerization stage of polyurethane, but it is preferable to prepare a polyurethane solution in advance and then add it.

  The method for producing the polyurethane solution and the method for producing the polyurethane as the solute of the solution may be either a melt polymerization method or a solution polymerization method, or may be another method. However, the solution polymerization method is more preferable. In the case of the solution polymerization method, there is little generation of foreign substances such as gel in the polyurethane, it is easy to spin, and it is easy to obtain a low-definition polyurethane yarn. 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, a polymer diol having a molecular weight of 1800 or more and 6000 or less, MDI as a diisocyanate, ethylene glycol as a diol, 1,3 propanediol and 1,4 butanediol are used. And those having a melting point on the high temperature side of 200 ° C. or higher and 260 ° C. or lower.

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

  When a diol is used as the chain extender, a typical method for adjusting the melting point on the high temperature side of the polyurethane to a range of 200 ° C. to 260 ° C. is achieved by controlling the types and ratios of the polymer diol, MDI, and diol. obtain. When the molecular weight of the polymer diol is low, a polyurethane having a high melting point at a 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 By reducing the amount of the polyurethane, a polyurethane having a high temperature melting point can be obtained.

  In the case where the molecular weight of the polymer diol is 1800 or more, in order to increase the melting point on the high temperature side to 200 ° C. or more, the polymerization is advanced at a ratio of (MDI moles) / (polymer diol moles) = 1.5 or more. Is preferred.

In the synthesis of such polyurethane, it is also preferable to use one or a mixture of two or more catalysts such as amine catalysts and organometallic catalysts.
Examples of the amine catalyst include N, N-dimethylcyclohexylamine, N, N-dimethylbenzylamine, triethylamine, N-methylmorpholine, N-ethylmorpholine, N, N, N ′, N′-tetramethylethylenediamine, 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′-trimethylaminoethylethanolamine, N-methyl-N ′-(2-hydroxyethyl) piperazine, 2,4,6-tris (dimethylaminomethyl) phenol, N, N-dimethylaminohexanol, tri Examples include ethanolamine.

  Examples of organometallic catalysts include tin octoate, dibutyltin dilaurate, and lead dibutyl octoate.

  The concentration of the polyurethane solution thus obtained is usually preferably in the range of 30% by weight to 80% by weight.

  In the present invention, it is preferable to add rosin and / or a derivative thereof to such a polyurethane solution. As a method for adding rosin and its derivatives to the polyurethane solution, any method can be adopted. As typical methods, various means such as a method using a static mixer, a method using stirring, a method using a homomixer, a method using a biaxial extruder, and the like can be adopted. Here, the added rosin and its derivative are preferably added as a solution from the viewpoint of uniform addition to the polyurethane solution.

  When adding rosin and / or a derivative thereof to the polyurethane solution, for example, the above-mentioned agents such as light-resistant agents and antioxidants, pigments and the like may be added simultaneously.

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

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

  Also, the dry spinning method is not particularly limited, and spinning may be performed by appropriately selecting a spinning condition or the like suitable for desired characteristics and spinning equipment.

  For example, the setting property and stress relaxation of the polyurethane yarn of the present invention are particularly susceptible to the speed ratio between the godet roller and the winder, and therefore, it is preferably determined as appropriate according to the intended use of the yarn. That is, from the viewpoint of obtaining a polyurethane yarn having desired setting properties and stress relaxation, the speed ratio of the godet roller and the winder is preferably wound in a range of 1.10 to 1.65. And when obtaining the polyurethane yarn which has especially high setting property and low stress relaxation, the speed ratio of a godet roller and a winder has the more preferable range of 1.15 or more and 1.4 or less, and 1.15 or more and 1. A range of 35 or less is more preferable.

  On the other hand, when obtaining a polyurethane yarn having low setability and high stress relaxation, the speed ratio of the godet roller and the winder is preferably wound in the range of 1.25 or more and 1.65 or less, and 1.35 or more. The range of 1.65 or less is more preferable.

  Further, the spinning speed is preferably 450 m / min or more from the viewpoint of improving the strength of the obtained polyurethane yarn.

  The polyurethane yarn obtained as described above is used, for example, when a fabric is produced together with other fibers. Other fibers used together with the polyurethane yarn for producing the fabric include polyamide fibers and polyester fibers.

  Here, the polyamide fiber is a fiber represented by nylon 6 fiber or nylon 66 fiber, but is not limited thereto. Polyester fibers include polyethylene terephthalate, polytrimethylene terephthalate, polytetramethylene terephthalate, ester copolymers containing polytetramethylene glycol and ethylene glycol as main components as diol components, and their cationic dye-modified polyesters, etc. It is a fiber composed of polyester.

  The polyurethane yarn of the present invention is preferably a fabric composed of these polyamide fibers or polyester fibers from the viewpoint of processability and durability of the fabric, but is a synthetic fiber composed of polyacrylic, polyvinyl chloride or the like. Alternatively, a regenerated cellulose fiber made of copper ammonia rayon, viscose rayon, or purified cellulose, or a natural fiber material such as regenerated protein fiber, semi-synthetic fiber, cotton, silk, or wool may be used in combination.

  The polyurethane yarn in the fabric may be used in the state of bare yarn, such as a core spun yarn covered with other fibers, an air covering yarn, a twisted yarn with other fibers, a twisted yarn, an interlace yarn, etc. You may use in the state of a composite yarn. The fabric composed of the polyurethane yarn and other fibers may be a knitted fabric composed of the above-mentioned composite yarn, or may be exchanged with other fibers in knitting such as warp knitting, circular knitting, and weft knitting. It may be knitted.

  When the fabric is knitted fabric, warp knitting or weft knitting may be used, and examples thereof include tricot, russell, circular knitting and the like. The knitting structure may be any knitting structure such as half knitting, reverse half knitting, double atlas knitting, double denby knitting, etc., but the knitted fabric surface should 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 measuring strength, stress relaxation, setability, elongation, heat setability, and return characteristics after heat set in the present invention will be described.

[Strength, stress relaxation, setability, elongation]
The strength, stress relaxation, setability, and elongation were measured by subjecting the sample yarn to a tensile test using an Instron 4502 type tensile tester.

  These are defined by: 300% elongation of a 5 cm (L1) sample was repeated 5 times at a tensile speed of 50 cm / min. The stress at this time was defined as (G1).

  The 300% elongation was then held 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 recovered and the stress became zero was defined as (L2). Furthermore, it extended | stretched until the sample thread | yarn cut | disconnected 6 times. The stress at break was (G3), and the length of the sample yarn at break was (L3).

  Hereinafter, the characteristic is given by the following equation.

Strength = (G3)
Stress relaxation = 100 × ((G1) − (G2)) / (G1)
Set property = 100 × ((L2) − (L1)) / (L1)
Elongation = 100 × ((L3) − (L1)) / (L1)
[Heat set property]
The sample yarn (length = L5) was stretched 100% (length = 2 × (L5)). This length was treated at 160 ° C. for 1 minute. Furthermore, it was left at room temperature for 1 day with the same length. Next, the elongation state of the sample yarn was removed, and the length (L6) was measured.

Heat setting property = 100 × ((L6) − (L5)) / (L5)
A higher value indicates better heat setability.

[Heat resistance, return characteristics after heat setting]
The return characteristics after heat setting were measured by subjecting the sample yarn after heat setting as described above to a tensile test using an Instron 4502 type tensile tester.

  These are defined by: 300% elongation of a 5 cm (L7) sample was repeated 5 times at a tensile speed of 50 cm / min. Next, the length of the sample yarn when the elongation was recovered and the stress became zero was defined as (L8). Furthermore, it extended | stretched until the sample thread | yarn cut | disconnected 6 times. The stress at the time of this break was defined as (G4). Hereinafter, the characteristic is given by the following equation.

Heat resistance = (G4)
Return characteristics after heat setting = 100 × ((L8) − (L7)) / (L7)
The heat resistance indicates that the higher the value, the better. The return characteristic after heat setting indicates that the lower the value, the better the stretchability.

[Example 1]
A polymer solution A1 was prepared by preparing a DMAc solution (35% by weight) of polyurethane urea polymer composed of PTMG having a molecular weight of 1800, MDI, ethylenediamine and diethylamine as a terminal blocking agent. Next, a DMAc solution ( 17 % by weight) of rosin (product name: Pine Crystal (R) KR-614, softening point 86 ° C.) manufactured by Arakawa Chemical Co., Ltd. was stirred at 25 ° C. to prepare a solution (B1). Further, polyurethanes formed by the reaction of t-butyldiethanolamine and methylene-bis- (4-cyclohexyl isocyanate) described in US Pat. No. 3,555,115 are described in US Pat. No. 3,553,290. A DMAc solution (35% by weight) of a 2: 1 weight ratio mixture of p-cresol and divinylbenzene condensation polymer was prepared to obtain an antioxidant solution C1 (35% by weight). Polymer solutions A1, B1, and C1 were uniformly mixed at 92%, 6%, and 2% by weight to obtain Solution D1. This was dry-spun at a speed ratio of 490 m / min, with a speed ratio of 1.4 between the godet roller and the winder, to obtain a 200 g wound body of polyurethane yarn having a content of 33 decitex, 3 filaments and rosin of 3% by weight. Obtained.

  Table 1 shows the breaking elongation, breaking strength, setting property, stress relaxation, heat setting property, heat resistance, and return property after heat setting of the obtained yarn. The heat setting property was increased by about 1.6 times as compared with Comparative Example 1 containing no B1. The heat resistance and the return characteristics after heat setting were the same as those in Comparative Example 1.

[Example 2]
Polymer solutions A1, B1, and C1 were uniformly mixed at 97% by weight, 1% by weight, and 2% by weight to obtain Solution D2. This is dry-spun at a speed ratio of 540 m / min with a speed ratio of godet roller and winder of 1.25, so that 200 g of a polyurethane yarn having 33 decitex, 3 filaments and a rosin content of 0.5% by weight is obtained. Got.

  Table 1 shows the breaking elongation, breaking strength, setting property, stress relaxation, heat setting property, heat resistance, and return property after heat setting of the obtained yarn. The heat setting property was increased about 1.5 times as compared with Comparative Example 1 containing no B1. The heat resistance and the return characteristics after heat setting were the same as those in Comparative Example 1.

[Example 3]
A DMAc solution ( 15 % by weight) of rosin ester (product name: Pine Crystal (R) KE-100, thermal softening point: 100 ° C.) manufactured by Arakawa Chemical Co., Ltd. was prepared. The adjustment was performed in the same manner as in Example 1. This was designated as rosin-containing solution B2. Polymer solutions A1, B2, and C1 were uniformly mixed at 74% by weight, 24% by weight, and 2% by weight to obtain Solution D3. This was dry-spun at a speed ratio of 540 m / min with a speed ratio of godet roller and winder of 1.25, so that 200 g of a polyurethane yarn having a content of 33 decitex, 3 filaments, and rosin ester of 12% by weight was obtained. Got.

  Table 1 shows the breaking elongation, breaking strength, setting property, stress relaxation, heat setting property, heat resistance, and return property after heat setting of the obtained yarn. The heat setting property was increased about 1.6 times as compared with Comparative Example 1 containing no B2. The heat resistance and the return characteristics after heat setting were the same as those in Comparative Example 1.

[Example 4 ]
A polymer solution A2 was prepared by polymerizing a DMAc solution ( 17 % by weight) of a polyurethane polymerization raw material comprising PTMG, MDI and ethylene glycol having a molecular weight of 2900. A2, B1, and C1 were uniformly mixed at 92 wt%, 6 wt%, and 2 wt% to obtain a solution D5. The solution D5 was dry-spun at a speed of 500 m / min with a speed ratio of the godet roller and the winder of 1.35, whereby 200 g of a polyurethane yarn having 33 dtex 2-filament and a rosin content of 3% by weight was wound. Got.

  Table 1 shows the breaking elongation, breaking strength, setting property, stress relaxation, heat setting property, heat resistance, and return property after heat setting of the obtained yarn. The return characteristic after heat setting was 0.74 times smaller and better than that of Comparative Example 2 containing no B1. Further, the heat resistance and heat setability were equivalent to those of Comparative Example 2.

[Comparative Example 1]
Polymer solutions A1 and C1 were uniformly mixed at 98% by weight and 2% by weight to obtain a solution E1. The solution E1 was dry-spun at a speed ratio of 540 m / min with a speed ratio of a godet roller and a winder of 1.25, to obtain a 200 g wound body of 33 dtex and 3 filaments. Table 1 shows the elongation at break, breaking strength, setability, stress relaxation, heat setability, heat resistance, and return characteristics after heat set of this yarn.

[Comparative Example 2]
Polymer solutions A2 and C1 were uniformly mixed at 98% by weight and 2% by weight to obtain a solution E2. The solution E2 was dry-spun at a speed of 500 m / min with a speed ratio of a godet roller and a winder of 1.35 to obtain a 200 g wound body of 33 dtex 2-filament. Table 1 shows the elongation at break, breaking strength, setability, stress relaxation, heat setability, heat resistance, and return characteristics after heat set of this yarn.

[Comparative Example 3]
A DMAc solution ( 11 % by weight) of polyvinylpyrrolidone (K-30) disclosed in JP-A-11-200137 was prepared and designated F1. A1, F1, and C1 were uniformly mixed at 78 wt%, 20 wt%, and 2 wt% to obtain a uniform solution E4. The solution E4 was dry-spun at a speed ratio of 540 m / min with a speed ratio of the godet roller and the winder of 1.25, so that the polyvinylpyrrolidone (K-30) content of 3 decitex of 3 decitex was 7% by weight. A wound body was obtained. Table 1 shows the breaking elongation, breaking strength, setting property, stress relaxation, heat setting property, and return property after heat setting of this yarn. The heat setting property was as good as that of Example 1, but the heat resistance and the return characteristics after heat setting were inferior to those of Comparative Example 1.

[Comparative Example 4]
A DMAc solution of Eastman's cellulose ester (product name: Tenite (R) butyrate, main component cellulose acetate butyrate, heat softening point 145 ° C.) was prepared in the same manner as in Example 1, and cellulose ester solution B5 ( 11 wt. %).

  Polymer solution A1 and cellulose ester solutions B5 and C1 were uniformly mixed at 78 wt%, 20 wt% and 2 wt%, respectively, to obtain spinning solution E5. By spinning the spinning solution E5 by dry spinning at a spinning speed of 540 m / min with a speed ratio of the godet roller and winder of 1.25, the content of the cellulose ester of 33 dtex 3-filament is 7% by weight. A 200 g wound yarn was obtained. Table 1 shows the breaking elongation, breaking strength, setting property, stress relaxation, heat setting property, heat resistance, and return property after heat setting of this yarn. The heat setting property was as good as that of Example 5, but the heat resistance was slightly inferior to that of Comparative Example 1, and the return characteristics after heat setting were significantly inferior to that of Comparative Example 1.

  The polyurethane yarn of the present invention can be used alone or in combination with various fibers, for example, socks, stockings, circular knitting, tricot, swimsuit, ski trousers, work clothes, smoke fire clothes, clothes, golf pants, wet suit, Fastening materials for various textiles such as bras, girdles, gloves and socks, fastening materials for preventing sanitary products such as paper diapers, fastening materials for waterproofing materials, imitation bait, artificial flowers, electrical insulation, wiping cloth, copy cleaner, gasket It can be used for various purposes.

Claims (5)

A polyurethane yarn, characterized in that main constituents are a polymer diol and a diisocyanate, and contain rosin and / or a derivative thereof having a Hazen color of 400 or less . 2. The polyurethane yarn according to claim 1, wherein the rosin and / or a derivative thereof has a heat softening point of 70 ° C. or higher and 150 ° C. or lower. The polyurethane yarn according to claim 1 or 2, wherein the content of the rosin and / or derivative thereof is 0.1 wt% or more and 20 wt% or less. A method for producing a polyurethane yarn, characterized in that when producing a polyurethane yarn whose main constituents are a polymer diol and a diisocyanate, spinning is carried out by containing rosin and / or a derivative thereof having a Hazen color of 400 or less . The method for producing a polyurethane yarn according to claim 4, wherein the spinning method is dry.