JP2016016536A - Elastic material having good fittability - Google Patents
Elastic material having good fittability Download PDFInfo
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本発明は、身体へのフィット性が良い伸縮材料に関する。さらに詳しくは、本発明は、外観の審美性に優れ、柔らかくて肌触りが良い、紙おむつの腹部ギャザー部等に好適な伸縮材料に関する。 The present invention relates to a stretchable material having a good fit to the body. More specifically, the present invention relates to a stretchable material suitable for an abdomen gathered portion of a paper diaper, which is excellent in appearance aesthetics, soft and soft to the touch.
紙おむつ等の衛生材料用途においては、腹部、腰部、脚部等にギャザー様の伸縮材料が使用されている。かかる伸縮材料に求められる性能には、着用時に、身体に良好にフィットし、かつ、ズレや過度な締め付けることなく、適切な範囲の着圧を保つ伸縮特性が必要とされる。加えて、適切な範囲の着圧で肌に直接触れるものであることから、伸縮材料には、薄くて柔らかく、肌触りが良く肌への刺激性が低い性能が求められる。さらには近年、所謂軽失禁用の大人用紙おむつにおいては、おむつをアンダーウェアとして着用した状態でズボン、スカート等のアウターウェアを着用して活動をする場合が多く、活動時にずり落ちにくく、なおかつ、着用したおむつがアウターウェア越しに目立たないことが求められており、これらのおむつに使用される伸縮材料には、従来にはない薄さとずり落ち防止性能の両立と、外観の審美性が求められるようになっている。 In sanitary material applications such as disposable diapers, gather-like stretchable materials are used for the abdomen, waist, legs, and the like. The performance required for such a stretchable material requires a stretchable property that fits well to the body when worn and maintains an appropriate range of pressure without slipping or excessive tightening. In addition, since the skin is directly touched with an appropriate range of pressure, the stretchable material is required to have a thin and soft performance with good touch and low irritation to the skin. Furthermore, in recent years, in so-called light incontinence adult diapers, there are many cases where activities are performed by wearing outerwear such as trousers and skirts while wearing diapers as underwear, and it is difficult to slip off during activities, and It is required that the worn diaper is not conspicuous over the outerwear, and the stretchable material used for these diapers is required to have both unprecedented thinness and anti-slip performance and aesthetic appearance. It is like that.
伸縮材料を得る方法については、これまでにもさまざまな検討が行われてきた。
下記特許文献１には、複合スパンボンド不織布と伸縮性層からなる複合体を延伸することにより得られた、微細な折り畳み構造を有する複合体が開示されている。
また、下記特許文献２には、伸縮性繊維と伸張性繊維からなる不織布をギア延伸加工することによる伸縮性シートの製造方法が開示されている。
さらに、下記特許文献３には、弾性繊維を含む層の一面に弾性繊維を貼り合せた伸縮可能な不織布が開示されている。
しかしながら、これらの伸縮材料においては、主に不織布を延伸することにより伸縮しない繊維成分を延伸させ、伸縮する繊維成分のキックバックにより伸縮性を発現させている技術である点から、おのずと伸縮材料の伸長率には制限があり、十分なフィット性能とずり落ち防止性能を満たすことができていなかった。
Various studies have been conducted on methods for obtaining stretchable materials.
The following Patent Document 1 discloses a composite having a fine folded structure obtained by stretching a composite made of a composite spunbond nonwoven fabric and a stretchable layer.
Patent Document 2 below discloses a method for producing a stretchable sheet by subjecting a nonwoven fabric composed of stretchable fibers and stretchable fibers to gear stretching.
Furthermore, Patent Document 3 below discloses a stretchable nonwoven fabric in which elastic fibers are bonded to one surface of a layer containing elastic fibers.
However, in these stretchable materials, the stretchable fiber component is stretched mainly by stretching the nonwoven fabric, and the stretchability is manifested by the kickback of the stretchable fiber component. There was a limit to the elongation rate, and sufficient fitting performance and slip-off prevention performance could not be satisfied.
一方、下記特許文献４には、多数本の弾性糸を平行に並べた弾性糸ビーム巻き上げ体から多数本の弾性糸を不織布間に挿入し固定することを特徴とする紙おむつ用伸縮性不織布の製造方法が開示されている。多数本の弾性糸を不織布間に挿入固定する方法は、十分なフィット性能とずり落ち防止性能を満たすという観点からは好ましいことである。しかしながら、多数本の弾性糸を複数本挿入固定することにより過大な締め付け力を発現し、加えて、ギャザー部分の凹凸状起伏が過大となって肌への刺激が強まってしまうことがあり、柔らかくて肌触りが良く、肌への刺激性が低い性能という観点からは、必ずしも満足できるものではなかった。 On the other hand, in Patent Document 4 below, the production of a stretchable nonwoven fabric for paper diapers characterized in that a large number of elastic yarns are inserted and fixed between nonwoven fabrics from an elastic yarn beam winding body in which a large number of elastic yarns are arranged in parallel. A method is disclosed. The method of inserting and fixing a large number of elastic yarns between the nonwoven fabrics is preferable from the viewpoint of satisfying sufficient fitting performance and slip-off prevention performance. However, an excessive tightening force is expressed by inserting and fixing a large number of elastic yarns, and in addition, unevenness in the gathered portion may become excessive, which may increase the irritation to the skin and may be soft. From the viewpoint of good touch and low irritation to the skin, it was not always satisfactory.
前記した従来技術の伸縮材料の問題に鑑み、本発明が解決しようとする課題は、身体への良好なフィット性能とずり落ち防止性能、柔らかくて肌触りが良く肌への刺激性が低い性能に加え、着用時にアウターに響きにくい薄さと軽さを実現する使い捨ておむつに好適に使用できる伸縮部材を提供することである。 In view of the problems of the above-mentioned conventional stretchable materials, the problems to be solved by the present invention include a good fit performance to the body, a slip-off prevention performance, a soft and soft touch and a low irritation to the skin. It is to provide a stretchable member that can be suitably used for a disposable diaper that realizes thinness and lightness that do not easily resonate with the outer when worn.
本発明者らは、上記課題を解決すべく、鋭意検討し実験を重ねた結果、不織布とポリウレタン弾性繊維が接合された伸縮部材において、目付、厚み、伸び切り伸長率を特定範囲とすることで、身体への良好なフィット性能とずり落ち防止性能、柔らかくて肌触りが良く肌への刺激性が低い性能に加え、着用時にアウターに響きにくい薄さと軽さを実現することができることを見出し、本発明を完成するに至ったものである。 As a result of intensive studies and repeated experiments to solve the above-mentioned problems, the inventors of the present invention have made the basis weight, thickness, stretch elongation rate within a specific range in a stretchable member joined with a nonwoven fabric and polyurethane elastic fiber. In addition to the good fit performance to the body and the anti-slip performance, the softness and softness and the low irritation to the skin, we have found that it is possible to realize thinness and lightness that does not resonate with the outer when worn. The invention has been completed.
すなわち本発明は、以下のとおりのものである。
［１］一対の不織布間に複数本のポリウレタン弾性繊維を挿入して接合した少なくとも一方向に伸縮する伸縮複合材料であって、目付が５０ｇ／ｍ２以上２００ｇ／ｍ２以下、厚みが０．５ｍｍ以上５ｍｍ以下、かつ、伸び切り伸長率が５０％以上３００％以下であることを特徴とする前記伸縮複合材料。
That is, the present invention is as follows.
[1] An elastic composite material that extends and contracts in at least one direction by inserting and joining a plurality of polyurethane elastic fibers between a pair of nonwoven fabrics, having a basis weight of 50 g / m 2 or more and 200 g / m 2 or less, and a thickness of 0.00. The stretchable composite material, wherein the stretchable composite material is 5 mm or more and 5 mm or less and has an elongation to elongation of 50% or more and 300% or less.
［２］伸び切り伸長率が５０％以上１００％未満の伸縮複合材料においては、５０％繰り返し伸縮試験における３回目の４０％往応力が６ｃＮ以上２４ｃＮ以下、３回目の復応力が４ｃＮ以上２２ｃＮ以下であり、そして伸び切り伸長率が１００％以上３００％以下の伸縮材料においては、１００％繰り返し伸縮試験における３回目の８０％往応力が２０ｃＮ以上６０ｃＮ以下、３回目の復応力が１５ｃＮ以上５０ｃＮ以下である、前記［１］に記載の伸縮複合材料。 [2] In a stretchable composite material having an elongation at elongation of 50% or more and less than 100%, the third 40% forward stress in the 50% repeated stretch test is 6 cN or more and 24 cN or less, and the third reset stress is 4 cN or more and 22 cN or less. In the stretchable material having a stretch elongation rate of 100% to 300%, the third 80% forward stress in the 100% repeated stretch test is 20 cN to 60 cN, and the third reverse stress is 15 cN to 50 cN. The stretchable composite material according to [1], wherein
［３］前記ポリウレタン弾性繊維の繊度が１０ｄｔｅｘ以上３００ｄｔｅｘ以下である、前記［１］又は［２］に記載の伸縮複合材料。 [3] The stretchable composite material according to [1] or [2], wherein the fineness of the polyurethane elastic fiber is 10 dtex or more and 300 dtex or less.
本発明の伸縮材料は、一対の不織布間に複数本のポリウレタン弾性繊維を挿入して接合した伸縮複合材料である。不織布とポリウレタン弾性繊維を接合する方法としては従来公知の技術を適用することができ、例えば、ホットメルト接着剤を使用して不織布とポリウレタン弾性繊維を接合する方法や、熱により不織布及び／又はポリウレタン弾性繊維の一部又は全部を溶融させて接合する方法により不織布とポリウレタン弾性繊維を接合することができる。不織布とポリウレタン弾性繊維は、ポリウレタン弾性繊維の長手方向に連続して全面が接合されていてもよいし、ポリウレタン弾性繊維の長手方向に断続的に部分的に接合されていてもよい。また、本発明の所望の作用効果を発揮する限り、不織布とポリウレタン弾性繊維以外の材料が挿入、貼付、コーティングされていてもよい。 The stretchable material of the present invention is a stretchable composite material in which a plurality of polyurethane elastic fibers are inserted and bonded between a pair of nonwoven fabrics. Conventionally known techniques can be applied as a method of joining the nonwoven fabric and the polyurethane elastic fiber, for example, a method of joining the nonwoven fabric and the polyurethane elastic fiber using a hot melt adhesive, or a nonwoven fabric and / or polyurethane by heat. A nonwoven fabric and a polyurethane elastic fiber can be joined by a method in which a part or all of the elastic fiber is melted and joined. The whole surface of the nonwoven fabric and the polyurethane elastic fiber may be continuously joined in the longitudinal direction of the polyurethane elastic fiber, or may be intermittently partially joined in the longitudinal direction of the polyurethane elastic fiber. Moreover, as long as the desired effect of this invention is exhibited, materials other than a nonwoven fabric and a polyurethane elastic fiber may be inserted, stuck, and coated.
不織布とポリウレタン弾性繊維を接合して伸縮材料とする方法に特に制限はなく、従来公知の方法が適用できる。例えば、予め伸長させたポリウレタン弾性繊維を不織布と接合した後に、ポリウレタン弾性繊維の伸長を緩めることにより、ギャザー様構造を発現させて伸縮材料を得る方法を挙げることができる。
本発明の伸縮材料は目付が５０ｇ／ｍ２以上２００ｇ／ｍ２以下であることが必要である。目付が５０ｇ／ｍ２以上であれば衛生材料等に使用される伸縮材料として十分な強力を有し、目付が２００ｇ／ｍ２以下であれば衛生材料等に使用されたときの軽さを満足することができる。衛生材料等に使用された時の十分な強力と軽さのバランスの観点からは、目付は８０ｇ／ｍ２以上１５０ｇ／ｍ２以下であることが好ましい。
伸び切り伸長率が５０％以上１００％未満の伸縮複合材料においては、５０％繰り返し伸縮試験における３回目の４０％往応力が６ｃＮ以上２４ｃＮ以下、３回目の復応力が４ｃＮ以上２２ｃＮ以下であり、そして伸び切り伸長率が１００％以上３００％以下の伸縮材料においては、１００％繰り返し伸縮試験における３回目の８０％往応力が２０ｃＮ以上６０ｃＮ以下、３回目の復応力が１５ｃＮ以上５０ｃＮ以下であることが好ましい。
There is no restriction | limiting in particular in the method of joining a nonwoven fabric and a polyurethane elastic fiber, and using it as an elastic material, A conventionally well-known method is applicable. For example, a method of obtaining a stretchable material by expressing a gather-like structure by loosening the elongation of the polyurethane elastic fiber after joining the polyurethane elastic fiber previously stretched with the nonwoven fabric can be mentioned.
The elastic material of the present invention is required to have a basis weight of 50 g / m 2 or more and 200 g / m 2 or less. If the basis weight is 50 g / m 2 or more, it has sufficient strength as a stretchable material used for sanitary materials, and if the basis weight is 200 g / m 2 or less, it satisfies the lightness when used for sanitary materials. can do. From the viewpoint of a balance between sufficient strength and lightness when used as a sanitary material, the basis weight is preferably 80 g / m 2 or more and 150 g / m 2 or less.
In the stretchable composite material having a stretch elongation rate of 50% or more and less than 100%, the third 40% forward stress in the 50% repeated stretch test is 6 cN or more and 24 cN or less, and the third return stress is 4 cN or more and 22 cN or less, For stretchable materials with a stretch elongation of 100% or more and 300% or less, the third 80% forward stress in the 100% repeated stretch test is 20 cN or more and 60 cN or less, and the third return stress is 15 cN or more and 50 cN or less. Is preferred.
また、本発明の伸縮材料は厚みが０．５ｍｍ以上５ｍｍ以下であることが必要である。厚みが０．５ｍｍ以上あれば衛生材料等に使用される伸縮材料として十分な強力を有し、厚みが５ｍｍ以下であれば衛生材料等に使用された時の薄さを満足することができる。 The stretchable material of the present invention needs to have a thickness of 0.5 mm or more and 5 mm or less. If the thickness is 0.5 mm or more, it has sufficient strength as a stretchable material used for sanitary materials and the like, and if the thickness is 5 mm or less, it can satisfy the thinness when used for sanitary materials and the like.
さらに、本発明の伸縮材料は、無緊張状態（リラックス状態）から不織布が破断するまで伸長したときの伸び切り伸長率が５０％以上３００％以下であることが必要である。伸び切り伸長率が５０％以上あれば身体への良好なフィット性能を満足することができ、伸び切り伸長率が３００％以下であれば衛生材料等に使用された時にずり落ち防止性能を満足することができる。 Furthermore, the stretchable material of the present invention needs to have a stretch elongation ratio of 50% or more and 300% or less when stretched from an unstrained state (relaxed state) until the nonwoven fabric breaks. If the elongation / extension rate is 50% or more, a good fit performance to the body can be satisfied, and if the elongation / extension rate is 300% or less, the slip prevention performance is satisfied when used for sanitary materials. be able to.
ポリウレタン弾性繊維が不織布と接合された伸縮材料には、２本以上のポリウレタン弾性繊維を同時に不織布に接合させることが好ましい。このとき、ポリウレタン弾性繊維は平行に並べられた状態で不織布に接合してもよいし、円弧状、放物線状、ジグザグ状、正弦波状などで並べられてもよいし、これらを組み合わせて並べられてもよい。伸縮材料のギャザー様構造のピッチを小さくし、肌触りが良くて肌への刺激性が低い伸縮材料とするためには、ポリウレタン弾性繊維は平行に並べられた状態で不織布に接合することが好ましい。 It is preferable that two or more polyurethane elastic fibers are simultaneously bonded to the nonwoven fabric in the stretchable material in which the polyurethane elastic fibers are bonded to the nonwoven fabric. At this time, the polyurethane elastic fibers may be joined to the nonwoven fabric in a state of being arranged in parallel, may be arranged in an arc shape, a parabola shape, a zigzag shape, a sinusoidal shape, or the like, or a combination thereof. Also good. In order to reduce the pitch of the gather-like structure of the stretchable material, and to make the stretchable material having a good touch and low irritation to the skin, the polyurethane elastic fibers are preferably joined to the nonwoven fabric in a state of being arranged in parallel.
複数本のポリウレタン弾性繊維が不織布と接合する時には、ポリウレタン弾性繊維は任意の間隔で配置することができる。伸縮材料のギャザー様構造の均一性という観点ではポリウレタン弾性繊維は１０ｍｍ以下の間隔で配置することが好ましく、５ｍｍ以下の間隔で配置することがより好ましく、２ｍｍ以下の間隔で配置することが最も好ましい。ポリウレタン弾性繊維は必要に応じて部位ごとに異なる間隔で配置されていてもよい。ポリウレタン弾性繊維は必要に応じて任意の伸長率で伸長された状態で不織布と接合することができる。 When a plurality of polyurethane elastic fibers are bonded to the nonwoven fabric, the polyurethane elastic fibers can be arranged at an arbitrary interval. From the viewpoint of the uniformity of the gather-like structure of the stretchable material, the polyurethane elastic fibers are preferably arranged at intervals of 10 mm or less, more preferably at intervals of 5 mm or less, and most preferably at intervals of 2 mm or less. . The polyurethane elastic fibers may be arranged at different intervals for each part as necessary. The polyurethane elastic fiber can be bonded to the non-woven fabric in a stretched state at an arbitrary stretch rate as required.
本発明の伸縮材料に使用されるポリウレタン弾性繊維は、ポリウレタンやポリウレタンウレアを主な構成単位とする重合体（以下、ポリウレタン系重合体と称する。）からなる伸縮性を持つ繊維である。
ポリウレタン系重合体は、例えば、数平均分子量が６００〜５０００であるポリマーグリコールと有機ジイソシアネートを反応させてソフトセグメントとなるウレタン中間重合体を合成後、多官能性活性水素原子を有する鎖延長剤でハードセグメントを重合し、単官能性活性水素原子を有する末端停止剤で末端封鎖するといった公知の技術を用いることで製造することができる。鎖延長剤として、低分子ジオールを用いるとハードセグメントがウレタン結合からなるポリウレタン重合体となり、また、２官能性アミンを用いるとハードセグメントがウレア結合からなるポリウレタンウレア重合体を得ることができる。 ポリマーグリコールとしては、例えば、ポリオキシエチレングリコール、ポリオキシプロピレングリコール、ポリオキシテトラメチレングリコール、ポリオキシペンタメチレングリコール等のホモポリエーテルジオール、炭素原子数２から６の２種以上のオキシアルキレンから構成される共重合ポリエーテルジオール、アジピン酸、セバチン酸、マレイン酸、イタコン酸、アゼライン酸、マロン酸等の二塩基酸の一種又は二種以上とエチレングリコール、１，２−プロピレングリコール、１，３−プロピレングリコール、２，２−ジメチル−１，３−プロパンジオール、１，４−ブタンジオール、１，３−ブタンジオール、ヘキサメチレングリコール、ジエチレングリコール、１，１０−デカンジオール、１，３−ジメチロールシクロヘキサン、１，４−ジメチロールシクロヘキサン等のグリコールの一種または二種以上とから得られたポリエステルジオール、ポリエステルアミドジオール、ポリエステルエーテルジオール、ポリ−ε−カプロラクトンジオール、ポリバレロラクトンジオール等のポリラクトンジオール、ポリカーボネートジオール、ポリアクリルジオール、ポリチオエーテルジオール、ポリチオエステルジオール、又はこれらジオールの共重合物ないしは混合物等が挙げられる。伸縮材料が十分なフィット性能とずり落ち防止性能を持つためには、ポリマーグリコールとしてはポリオキシテトラメチレングリコールや、ポリオキシテトラメチレングリコールに炭素数の異なる、好ましくは分岐状の、アルキレン基をもつグリコールが共重合された共重合ポリエーテルジオールが好ましい。
The polyurethane elastic fiber used for the stretchable material of the present invention is a stretchable fiber made of a polymer having polyurethane or polyurethaneurea as a main structural unit (hereinafter referred to as a polyurethane polymer).
The polyurethane polymer is a chain extender having a polyfunctional active hydrogen atom after synthesizing a urethane intermediate polymer to be a soft segment by reacting a polymer glycol having a number average molecular weight of 600 to 5000 and an organic diisocyanate, for example. The hard segment can be produced by using a known technique such as polymerizing and end-capping with a terminal stopper having a monofunctional active hydrogen atom. When a low molecular weight diol is used as the chain extender, a polyurethane polymer whose hard segment is a urethane bond can be obtained, and when a bifunctional amine is used, a polyurethane urea polymer whose hard segment is a urea bond can be obtained. Examples of the polymer glycol include, for example, homopolyether diols such as polyoxyethylene glycol, polyoxypropylene glycol, polyoxytetramethylene glycol, and polyoxypentamethylene glycol, and two or more oxyalkylenes having 2 to 6 carbon atoms. Copolymerized polyether diol, adipic acid, sebacic acid, maleic acid, itaconic acid, azelaic acid, malonic acid and one or more dibasic acids and 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-dimethylol Cyclohexa Polylactone diols such as polyester diol, polyester amide diol, polyester ether diol, poly-ε-caprolactone diol, and polyvalerolactone diol obtained from one or more of glycols such as 1,4-dimethylolcyclohexane, Examples thereof include polycarbonate diol, polyacryl diol, polythioether diol, polythioester diol, and a copolymer or mixture of these diols. In order for the stretchable material to have sufficient fitting performance and slip-off prevention performance, the polymer glycol has polyoxytetramethylene glycol or polyoxytetramethylene glycol having a different number of carbon atoms, preferably a branched alkylene group. A copolymer polyether diol obtained by copolymerizing glycol is preferred.
有機ジイソシアネートとしては、例えば、メチレン−ビス（４−フェニルイソシアネート）、メチレン−ビス（３−メチル−４−フェニルイソシアネート）、２，４−トリレンジイソシアネート、２，６−トリレンジイソシアネート、ｍ−及びｐ−キシリレンジイソシアネート、α，α，α’，α’−テトラメチル−キシリレンジイソシアネート、ｍ−及びｐ−フェニレンジイソシアネート、４，４’−ジメチル−１，３−キシリレンジイソシアネート、１−アルキルフェニレン−２，４及び２，６−ジイソシアネート、３−（α−イソシアネートエチル）フェニルイソシアネート、２，６−ジエチルフェニレン−１，４−ジイソシアネート、ジフェニル−ジメチルメタン−４，４−ジイソシアネート、ジフェニルエーテル−４，４’−ジイソシアネート、ナフチレン−１，５−ジイソシアネート、１，６−ヘキサメチレンジイソシアネート、メチレン−ビス（４−シクロヘキシルイソシアネート）、１，３−及び１，４−シクロヘキシレンジイソシアネート、トリメチレンジイソシアネート、テトラメチレンジイソシアネート、ペンタメチレンジイソシアネート、ヘキサメチレンジイソシアネート、イソフォロンジイソシアネート、又はこれらの混合物等が挙げられる。 Examples of the organic diisocyanate include 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-xylylene diisocyanate, 1-alkylphenylene -2,4 and 2,6-diisocyanate, 3- (α-isocyanatoethyl) phenyl isocyanate, 2,6-diethylphenylene-1,4-diisocyanate, diphenyl-dimethylmethane-4,4-diisocyanate, diphenyl ether-4, 4'-Diisocy Anate, naphthylene-1,5-diisocyanate, 1,6-hexamethylene diisocyanate, methylene-bis (4-cyclohexylisocyanate), 1,3- and 1,4-cyclohexylene diisocyanate, trimethylene diisocyanate, tetramethylene diisocyanate, penta Examples include methylene diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, or a mixture thereof.
多官能性活性水素原子を有する鎖延長剤としては、例えば、ヒドラジン、ポリヒドラジン、炭素原子数２〜１０の直鎖又は分岐した脂肪族、脂環族または芳香族の活性水素を有するアミノ基を持つ化合物で、例えば、エチレンジアミン、１，２プロピレンジアミン、特開平５−１５５８４１号公報に記載されているウレア基を有するジアミン類等のジアミン、ヒドロキシルアミン、水、低分子量のグリコール、例えば、エチレングリコール、１，２−プロピレングリコール、１，３−プロピレングリコール、２，２−ジメチル−１，３−プロパンジオール、１，４−ブタンジオール、１，３−ブタンジオール、ヘキサメチレングリコール、ジエチレングリコール、１，１０−デカンジオール、１，３−ジメチロールシクロヘキサン、１，４−ジメチロールシクロヘキサン等を用いることができ、好ましくは、エチレンジアミン、１，２−プロピレンジアミンである。 Examples of the chain extender having a polyfunctional active hydrogen atom include, for example, hydrazine, polyhydrazine, an amino group having a straight or branched aliphatic, alicyclic or aromatic active hydrogen having 2 to 10 carbon atoms. Compounds having ethylene diamine, 1,2 propylene diamine, diamines having urea group described in JP-A-5-155841, hydroxylamine, water, low molecular weight glycol, for example, 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- It can be used methylol cyclohexane, preferably, ethylenediamine, 1,2-propylenediamine.
単官能性活性水素原子を有する末端停止剤としては、例えば、ジエチルアミンのようなジアルキルアミン等やエタノールのようなアルキルアルコール等が用いられる。これらの鎖延長剤および末端停止剤は、単独でも又は２種以上混合して用いてもよい。
このポリウレタン系重合体には、ポリウレタン弾性繊維に通常用いられる他の化合物、例えば、紫外線吸収剤、酸化防止剤、光安定剤、耐塩素脆化剤、耐ガス安定剤、着色剤、艶消し剤、充填剤等を添加してもよい。
このようにして得られたポリウレタン系重合体は、公知の乾式紡糸、湿式紡糸、溶融紡糸等で繊維状に成形し、ポリウレタン弾性繊維を製造することができる。ポリウレタン弾性繊維はモノフィラメントでもマルチフィラメントでもよく、マルチフィラメントを構成する１本のフィラメントは単一のポリウレタン系重合体から構成されていてもよいし、２種類以上のポリウレタン系重合体から構成されていてもよい。このとき、２種類以上のポリウレタン系重合体は完全に混合されて紡糸されてポリウレタン弾性糸としてもよいし、一つのポリウレタン系重合体からなる一本のフィラメントを別のポリウレタン系重合体で被覆した鞘芯構造ポリウレタン弾性繊維や、一つのポリウレタン系重合体からなる複数のフィラメントを別のポリウレタン系重合体で被覆した海島構造ポリウレタン弾性繊維であってもよい。
Examples of the terminal terminator having a monofunctional active hydrogen atom include dialkylamines such as diethylamine and alkyl alcohols such as ethanol. These chain extenders and end terminators may be used alone or in combination of two or more.
This polyurethane polymer includes other compounds usually used for polyurethane elastic fibers, such as UV absorbers, antioxidants, light stabilizers, chlorine embrittlement resistance, gas resistance stabilizers, colorants, matting agents. A filler or the like may be added.
The polyurethane polymer thus obtained can be formed into a fiber shape by known dry spinning, wet spinning, melt spinning, etc. to produce polyurethane elastic fibers. The polyurethane elastic fiber may be monofilament or multifilament, and one filament constituting the multifilament may be composed of a single polyurethane polymer, or may be composed of two or more types of polyurethane polymers. Also good. At this time, two or more types of polyurethane polymers may be completely mixed and spun to form a polyurethane elastic yarn, or one filament made of one polyurethane polymer is coated with another polyurethane polymer. A sheath-core structure polyurethane elastic fiber or a sea-island structure polyurethane elastic fiber in which a plurality of filaments made of one polyurethane polymer are coated with another polyurethane polymer may be used.
ポリウレタン弾性繊維の繊度に制限はないが、身体にフィットしてずり落ちにくい性能と柔らかさを両立するためには１０ｄｔｅｘから３００ｄｔｅｘが好ましく、２０ｄｔｅｘから２００ｄｔｅｘがより好ましく、４０ｄｔｅｘから１００ｄｔｅｘがさらに好ましい。
得られたポリウレタン弾性繊維に、ポリジメチルシロキサン、ポリエステル変性シリコーン、ポリエーテル変性シリコーン、アミノ変性シリコーン、鉱物油、鉱物性微粒子、例えばシリカ、コロイダルアルミナ、タルク等、高級脂肪酸金属塩粉末、例えば、ステアリン酸マグネシウム、ステアリン酸カルシウム等、高級脂肪族カルボン酸、高級脂肪族アルコール、パラフィン、ポリエチレン等の常温で固形状ワックス等の油剤を単独で又は必要に応じて任意に組合せて付与してもよい。
The fineness of the polyurethane elastic fiber is not limited, but 10 dtex to 300 dtex is preferable, 20 dtex to 200 dtex is more preferable, and 40 dtex to 100 dtex is more preferable in order to achieve both softness and softness that fits the body.
The obtained polyurethane elastic fiber is added to polydimethylsiloxane, polyester-modified silicone, polyether-modified silicone, amino-modified silicone, mineral oil, mineral fine particles such as silica, colloidal alumina, talc, etc., higher fatty acid metal salt powder such as stearin. Oil agents such as solid waxes at room temperature such as magnesium acid and calcium stearate, higher aliphatic carboxylic acids, higher aliphatic alcohols, paraffin, polyethylene, etc. may be applied singly or optionally in combination.
本発明の伸縮材料に使用される不織布の種類には、特に制限はなく、スパンボンド式不織布、メルトブロウン式不織布、フラッシュ紡糸式不織布、静電紡糸式不織布、湿式紡糸式不織布などの長繊維不織布であってもよく、湿式抄造法により得られる短繊維不織布であってもよい。
不織布の目付に制限はないが、目付が５０ｇ／ｍ２以上２００ｇ／ｍ２以下の伸縮材料を得るためには、１つの不織布の目付としては１０〜６０ｇ／ｍ２以下であることが好ましい。
There is no restriction | limiting in particular in the kind of nonwoven fabric used for the elastic material of this invention, Long fiber nonwoven fabrics, such as a spun bond type nonwoven fabric, a melt blown type nonwoven fabric, a flash spinning type nonwoven fabric, an electrostatic spinning type nonwoven fabric, and a wet spinning type nonwoven fabric It may be a short fiber nonwoven fabric obtained by a wet papermaking method.
Although there is no limit to the basis weight of the nonwoven fabric, for basis weight to obtain a 50 g / m 2 or more 200 g / m 2 or less of the stretchable material is preferably as the basis weight of one nonwoven or less 10 to 60 g / m 2.
不織布を構成する繊維に特に制限はなく、ポリエチレン、ポリプロピレンなどのポリオレフィン繊維や、ポリエステル繊維、ポリアミド繊維、セルロース繊維、ポリウレタン繊維などであってよいし、これらを混合したものであってもよい。異なる繊維からなる不織布を二種類又はそれ以上を組み合わせて使用してもよい。衛生材料に好適に使用される伸縮材料に使用される不織布としては、ポリオレフィン系長繊維不織布が好ましい。ポリオレフィン系長繊維不織布を構成するポリオレフィン系繊維としては、例えば、ポリエチレン、ポリプロピレン又はそれらのモノマーと他のα−オレフィンとの共重合体などの樹脂からなる繊維等を用いることができる。このうち、強度が強く破断しにくく、伸縮材料を製造するときの寸法安定性に優れることから、ポリプロピレン又はポリプロピレン共重合体からなるポリプロピレン系繊維を用いることが好ましい。 There is no restriction | limiting in particular in the fiber which comprises a nonwoven fabric, Polyolefin fibers, such as polyethylene and a polypropylene, A polyester fiber, a polyamide fiber, a cellulose fiber, a polyurethane fiber, etc. may be sufficient, and what mixed these may be sufficient. You may use the nonwoven fabric which consists of a different fiber in combination of 2 or more types. As the nonwoven fabric used for the stretchable material suitably used for the sanitary material, a polyolefin-based long fiber nonwoven fabric is preferable. As the polyolefin fibers constituting the polyolefin long fiber nonwoven fabric, for example, fibers made of a resin such as polyethylene, polypropylene, or a copolymer of these monomers and other α-olefins can be used. Among these, it is preferable to use a polypropylene fiber made of polypropylene or a polypropylene copolymer because it is strong and hardly broken and has excellent dimensional stability when producing an elastic material.
伸縮材料が良好な柔軟性を持つためには、使用される不織布が高い柔軟性を持つことが好ましい。ポリオレフィン系長繊維不織布に高い柔軟性を付与するためには、長繊維を接合して不織布とする場合の接合手段としては、部分熱圧着法が好ましく、その部分熱圧着面積率は小さいほうがよい。また、不織布を構成するポリオレフィン長繊維の平均単糸繊度は小さい方が柔軟性は高くなるが、同時に紡糸安定性の悪化を引き起こすため、平均単糸繊度としては０．５ｄｔｅｘ以上３．０ｄｔｅｘ以下が好ましく、０．７ｄｔｅｘ以上２．０ｄｔｅｘ以下であることがさらに好ましく、０．７ｄｔｅｘ以上１．４ｄｔｅｘ以下であることが最も好ましい。良好な柔軟性を得るために、ポリオレフィン系長繊維不織布には凹凸の賦型加工をしていてもよい。賦型加工の形状としては直線、曲線、角、丸、梨地状、その他連続的又は非連続的のものが適用できるが、柔軟性効果の観点からは亀甲柄であることが好ましい。またさらに、良好な柔軟性を得るために、３〜６価のポリオールとモノカルボン酸とのエステル化合物をポリオレフィン系長繊維不織布に付与してもよい。エステル化合物はポリオレフィン系樹脂に混合してから紡糸してポリオレフィン系長繊不織布を得てもよいし、ポリオレフィン系長繊維不織布を得てからエステル化合物を付与してもよい。 In order for the stretchable material to have good flexibility, it is preferable that the nonwoven fabric used has high flexibility. In order to impart high flexibility to the polyolefin-based long-fiber nonwoven fabric, a partial thermocompression bonding method is preferable as a joining means when long fibers are joined to form a nonwoven fabric, and the partial thermocompression-bonding area ratio is preferably small. Further, the smaller the average single yarn fineness of the polyolefin long fibers constituting the nonwoven fabric, the higher the flexibility. At the same time, however, the spinning stability deteriorates, so the average single yarn fineness is 0.5 dtex or more and 3.0 dtex or less. Preferably, it is 0.7 dtex or more and 2.0 dtex or less, and most preferably 0.7 dtex or more and 1.4 dtex or less. In order to obtain good flexibility, the polyolefin-based long fiber nonwoven fabric may be subjected to uneven forming. As the shape of the forming process, a straight line, a curved line, a corner, a circle, a satin shape, and other continuous or non-continuous shapes can be applied. Furthermore, in order to obtain good flexibility, an ester compound of a tri- to hexavalent polyol and a monocarboxylic acid may be imparted to the polyolefin-based long fiber nonwoven fabric. The ester compound may be mixed with a polyolefin-based resin and then spun to obtain a polyolefin-based long fiber nonwoven fabric, or the ester compound may be applied after obtaining a polyolefin-based long fiber nonwoven fabric.
伸縮材料に用いられる不織布には、親水化剤を付与していてもよい。また、伸縮材料に用いられる不織布を構成する繊維には、所望の作用効果を発揮する限り、核剤、難燃剤、無機充填剤、顔料、着色剤、耐熱安定剤、帯電防止剤などを配合していてもよい。 The nonwoven fabric used for the elastic material may be provided with a hydrophilizing agent. In addition, nucleating agents, flame retardants, inorganic fillers, pigments, colorants, heat stabilizers, antistatic agents, etc., are blended into the fibers that make up the nonwoven fabric used for stretchable materials as long as they exhibit the desired effects. It may be.
以下、本発明を実施例で具体的に説明するが、本発明はこれらの実施例のみに限定されるものではない。実施例等における測定値は、下記の測定法により求めた。
（１）目付
伸縮材料の伸縮方向に沿って１０ｃｍ、それと直交する方向に沿って１０ｃｍの大きさを持つ正方形の試験片を１０枚採取して質量を測定し、その平均値を単位面積あたりの重量に換算して求めた。
EXAMPLES Hereinafter, although an Example demonstrates this invention concretely, this invention is not limited only to these Examples. The measured values in Examples and the like were obtained by the following measuring method.
(1) Weight per unit area Ten square test pieces having a size of 10 cm along the direction of expansion and contraction of the elastic material and 10 cm along the direction perpendicular thereto are measured to measure the mass, and the average value per unit area is obtained. Calculated in terms of weight.
（２）厚み
伸縮材料の伸縮方向に沿って１０ｃｍ、それと直交する方向に沿って１０ｃｍの大きさを持つ正方形の試験片を１０枚採取して、（株）尾崎製作所製ＤＧ−２５７型デジタルゲージとＳＩＳ−７型ダイヤルゲージスタンドを使用して、３０ｍｍφのプレッサーフートで測定圧０．５ｋＰａで厚みを測定し、試験片１０枚の平均値を求めた。
(2) Thickness Ten square test pieces having a size of 10 cm along the direction of expansion and contraction of the elastic material and 10 cm along the direction orthogonal thereto are collected, and DG-257 type digital gauge manufactured by Ozaki Mfg. Co., Ltd. And a SIS-7 type dial gauge stand, the thickness was measured with a 30 mmφ presser foot at a measurement pressure of 0.5 kPa, and the average value of 10 test pieces was obtained.
（３）伸び切り伸長率
伸縮材料の伸縮方向に沿って１０ｃｍ、それと直交する方向に沿って２．５ｃｍの長さを持つ長方形の試験片を１０枚採取し、自然状態で伸縮方向の両端部分から２．５ｃｍの位置に、印の間隔が５ｃｍとなるようにマーカーペンで印をつけた。次いで、この試験片を、チャック間距離５ｃｍに設定した（株）オリエンテック製ＲＴＧ型テンシロン万能材料試験機に、試験片の印を付けた部分がチャック間距離に一致するように装着し、試験速度５０ｍｍ／分で伸縮材料の不織布が破断するまで伸長し、そのときチャック間距離Ｌ（ｍｍ）を測定した。伸び切り伸長率は以下の式（１）に従って計算し、試験片１０枚の平均値を求めた。
伸び切り伸長率（％）＝（Ｌ−５０）／５０×１００
(3) Elongation elongation rate Ten rectangular test pieces having a length of 10 cm along the direction of expansion and contraction of the elastic material and 2.5 cm along the direction orthogonal thereto are collected, and both end portions in the expansion and contraction direction in the natural state. Was marked with a marker pen so that the distance between the marks was 5 cm. Next, this test piece was mounted on an RTG-type Tensilon universal material testing machine manufactured by Orientec Co., Ltd. with a distance between chucks of 5 cm so that the marked part of the test piece coincided with the distance between chucks. The stretchable material was stretched at a speed of 50 mm / min until the nonwoven fabric broke, and the inter-chuck distance L (mm) was measured. The stretch elongation rate was calculated according to the following formula (1), and the average value of 10 test pieces was obtained.
Stretched elongation (%) = (L-50) / 50 × 100
（４）５０％繰り返し伸縮試験
伸び切り伸長率が５０％以上１００％未満であった伸縮材料について、伸縮材料の伸縮方向に沿って１０ｃｍ、それと直交する方向に沿って２．５ｃｍの長さを持つ長方形の試験片を１０枚採取し、自然状態で伸縮方向の両端部分から２．５ｃｍの位置に、印の間隔が５ｃｍとなるようにマーカーペンで印をつけた。次いで、この試験片を、チャック間距離５ｃｍに設定した（株）オリエンテック製ＲＴＧ型テンシロン万能材料試験機に、試験片の印を付けた部分がチャック間距離に一致するように装着し、試験速度５０ｍｍ／分で３回、５０％伸縮させ、繰り返し３回目の４０％往応力（ｃＮ）、４０％復応力（ｃＮ）を測定し、試験片１０枚の平均値を求めた。
(4) 50% repetitive stretch test For stretchable materials having a stretch elongation rate of 50% or more and less than 100%, a length of 10 cm along the stretch direction of the stretch material and 2.5 cm along the direction orthogonal thereto. Ten rectangular test pieces were collected and marked with a marker pen at a position of 2.5 cm from both ends in the stretching direction in a natural state so that the distance between the marks was 5 cm. Next, the test piece was mounted on an RTG-type Tensilon universal material testing machine manufactured by Orientec Co., Ltd. with a distance between chucks of 5 cm so that the marked part of the test piece coincided with the distance between chucks. The sample was stretched and contracted 50% three times at a speed of 50 mm / min, and 40% forward stress (cN) and 40% restoring stress (cN) were measured repeatedly for the third time, and the average value of 10 test pieces was obtained.
（５）１００％繰り返し伸縮試験
伸び切り伸長率が１００％以上３００％以下であった伸縮材料について、伸縮材料の伸縮方向に沿って１０ｃｍ、それと直交する方向に沿って２．５ｃｍの長さを持つ長方形の試験片を１０枚採取し、自然状態で伸縮方向の両端部分から２．５ｃｍの位置に、印の間隔が５ｃｍとなるようにマーカーペンで印をつけた。次いで、この試験片を、チャック間距離５ｃｍに設定した（株）オリエンテック製ＲＴＧ型テンシロン万能材料試験機に、試験片の印を付けた部分がチャック間距離に一致するように装着し、試験速度５０ｍｍ／分で３回、１００％伸縮させ、繰り返し３回目の８０％往応力（ｃＮ）、８０％復応力（ｃＮ）を測定し、試験片１０枚の平均値を求めた。
(5) 100% Repeated Stretch Test For stretchable materials having an elongation at stretch rate of 100% to 300%, a length of 10 cm along the stretch direction of the stretch material and 2.5 cm along the direction orthogonal thereto. Ten rectangular test pieces were collected and marked with a marker pen at a position of 2.5 cm from both ends in the stretching direction in a natural state so that the distance between the marks was 5 cm. Next, this test piece was mounted on an RTG-type Tensilon universal material testing machine manufactured by Orientec Co., Ltd. with a distance between chucks of 5 cm so that the marked part of the test piece coincided with the distance between chucks. The test piece was stretched 100% at a speed of 50 mm / min three times, and the third 80% forward stress (cN) and 80% rest stress (cN) were measured repeatedly, and the average value of 10 test pieces was obtained.
［実施例１］
（１）不織布
ＭＦＲが３３ｇ／１０分のポリプロピレン樹脂に融点が８６〜９０℃（平均融点８８℃）のオクタデカン酸のグリセリド（水添動植物油脂）を純分１．２５重量％となる様に混合し、更に融点が１０４℃でＭＦＲが１８ｇ／１０分の低融点ポリプロピレン樹脂であるポリプロピレン系エラストマーを２０重量％となるように混合し、スパンボンド法により、紡口径０．３５ｍｍ、単孔吐出量０．５６ｇ／分、紡糸温度２５５℃で、フィラメント群を移動捕集面に向けて押し出し、長繊維ウェブを得た（紡糸速度５０００ｍ／分、平均単糸繊度１．１ｄｔｅｘ）。
次いで、得られたウェブを、温度１３８℃、線圧３５ｋｇｆ／ｃｍでフラットロールとエンボスロール（パターン仕様：直径０．４２５ｍｍ円形、千鳥配列、横ピッチ２．１ｍｍ、縦ピッチ１．１ｍｍ、圧着率６．３％）で繊維同士を熱接着し、目付１７ｇ／ｍ2の長繊維不織布を得た。
得られた長繊維不織布は一旦紙管に巻き取った後、幅３００ｍｍとなるようにスリット加工し、不織布巻取体を２つ作製した。
[Example 1]
(1) Nonwoven fabric Mixed with polypropylene resin with an MFR of 33 g / 10 min. Octadecanoic acid glycerides (hydrogenated vegetable oils and fats) having a melting point of 86 to 90 ° C. (average melting point of 88 ° C.) to a pure content of 1.25% by weight. Further, a polypropylene elastomer, which is a low melting point polypropylene resin having a melting point of 104 ° C. and an MFR of 18 g / 10 min, is mixed so as to be 20% by weight. The filament group was extruded toward the moving collection surface at a spinning temperature of 255 ° C. at 0.56 g / min, and a long fiber web was obtained (spinning speed 5000 m / min, average single yarn fineness 1.1 dtex).
Next, the obtained web was flat roll and emboss roll at a temperature of 138 ° C. and a linear pressure of 35 kgf / cm (pattern specifications: diameter 0.425 mm circular, staggered arrangement, horizontal pitch 2.1 mm, vertical pitch 1.1 mm, pressure bonding rate) 6.3%), the fibers were thermally bonded to each other to obtain a long fiber nonwoven fabric having a basis weight of 17 g / m 2 .
The obtained long fiber nonwoven fabric was once wound around a paper tube and then slitted to a width of 300 mm to produce two nonwoven fabric wound bodies.
（２）ポリウレタン弾性繊維
数平均分子量２０００のポリオキシテトラメチレングリコール２０００重量部と、４，４’−ジフェニルメタンジイソシアネート３８８重量部を乾燥窒素雰囲気下、６０℃で３時間攪拌することで反応させて、末端がイソシアネートであるウレタンプレポリマーを得た。これを室温まで冷却した後、ジメチルアセトアミド２９１９重量部を追加して室温で攪拌することにより、均一なプレポリマー溶液とした。
鎖延長剤としてのエチレンジアミン３０．６４重量部、末端停止剤としてのジエチルアミン５．８７重量部、ジメチルアセトアミド２７３９重量部に溶解した溶液を、上記プレポリマー溶液に高速攪拌下で一気に加え、さらに室温下で１時間反応させ、３０℃で３５００ポイズのポリウレタン溶液を得た。
このポリウレタン溶液に、添加剤としてｐ−クレゾールとジシクロペンタジエンとイソブチレンの縮合物をポリウレタンポリマー固形分に対して１重量％、２−［２−ヒドロキシ−３，５−ビス（α，α−ジメチルベンジル）フェニル］−２Ｈ−ベンゾトリアゾールをポリウレタンポリマー固形分に対して０．２重量％、ハイドロタルサイトをポリウレタンポリマー固形分に対して０．３重量％添加して、均一な溶液とした。添加剤を加えたポリウレタン溶液は室温減圧下で脱泡し、３０００ポイズの紡糸原液を得た。
(2) Polyurethane elastic fiber The reaction was performed by stirring 2000 parts by weight of polyoxytetramethylene glycol having a number average molecular weight of 2000 and 388 parts by weight of 4,4′-diphenylmethane diisocyanate in a dry nitrogen atmosphere at 60 ° C. for 3 hours, A urethane prepolymer having a terminal isocyanate was obtained. After cooling this to room temperature, 2919 parts by weight of dimethylacetamide was added and stirred at room temperature to obtain a uniform prepolymer solution.
A solution dissolved in 30.64 parts by weight of ethylenediamine as a chain extender, 5.87 parts by weight of diethylamine as a terminal terminator, and 2739 parts by weight of dimethylacetamide was added to the above prepolymer solution at a high speed with stirring at room temperature. For 1 hour to obtain a polyurethane solution of 3500 poise at 30 ° C.
To this polyurethane solution, a condensate of p-cresol, dicyclopentadiene and isobutylene as an additive was added in an amount of 1% by weight based on the polyurethane polymer solid content, and 2- [2-hydroxy-3,5-bis (α, α-dimethyl). Benzyl) phenyl] -2H-benzotriazole was added in an amount of 0.2% by weight based on the polyurethane polymer solid content, and hydrotalcite was added in an amount of 0.3% by weight based on the polyurethane polymer solid content to obtain a uniform solution. The polyurethane solution to which the additive was added was degassed under reduced pressure at room temperature to obtain a 3000 poise spinning stock solution.
この紡糸原液を、紡口口金８ホールを使用して紡口直下の加熱窒素ガス温度２７０℃の雰囲気下に吐出し、ゴデッドローラーと巻き取りボビン間のドラフト１．１５の条件下で、巻き取り速度６８０ｍ／分で、ジメチルシリコンを主成分とする油剤を付与した後、ボビンに巻き取り、８０ｄｔｅｘのポリウレタン弾性繊維を得た。
このようにして得られたポリウレタン弾性繊維のボビン１５０個を送り出しローラー状に並べて同じ速度で解舒し、１５０本のポリウレタン弾性糸が幅１７５ｍｍに均等に平行配列するポリウレタン弾性糸ビーム巻取体を作製した。このとき、ポリウレタン弾性糸の解舒糸速度は１００ｍ／分とし、ポリウレタン弾性糸ビーム巻取体の巻取糸速度は２００ｍ／分とすることで、ポリウレタン弾性糸を伸長率２．０倍で巻き取った。
This spinning dope is discharged into an atmosphere of a heated nitrogen gas temperature of 270 ° C. directly below the spinneret using a spinneret 8 hole, and wound under the condition of a draft 1.15 between the goded roller and the take-up bobbin. An oil agent mainly composed of dimethyl silicon was applied at a take-up speed of 680 m / min, and then wound around a bobbin to obtain an 80 dtex polyurethane elastic fiber.
A polyurethane elastic yarn beam take-up body in which 150 bobbins of polyurethane elastic fibers obtained in this manner are arranged in a feed roller and unwound at the same speed, and 150 polyurethane elastic yarns are uniformly arranged in parallel at a width of 175 mm. Produced. At this time, the polyurethane elastic yarn is wound at a stretch rate of 2.0 times by setting the unwinding speed of the polyurethane elastic yarn to 100 m / min and the winding speed of the polyurethane elastic yarn beam winding body to 200 m / min. I took it.
（３）伸縮材料
ポリウレタン弾性繊維ビーム巻取体から、糸速度が６６．７ｍ／分となるように１５０本のポリウレタン弾性繊維を解舒して供給した。二つの不織布巻取体から、不織布の線速度が１００ｍ／分となるように解舒して供給した。供給した二つの不織布の間に、平行に配列するように糸分けガイドで２ｍｍピッチに分繊したポリウレタン弾性繊維が供給されるよう配置し、カーテンコート法で５ｇ／ｍ２のホットメルト接着剤を付着させたポリウレタン弾性繊維を二つの不織布で挟み込むようにして、周速度１００ｍ／分の中間ローラーを通過させ、次いで線圧５ｋｇｆ／ｃｍ、周速度１００ｍ／分のニップロール間を通過させることにより不織布とポリウレタン弾性繊維を接合した。ポリウレタン弾性繊維が接合された不織布は、１００ｍ／分で紙管に巻き取った。不織布とポリウレタン弾性繊維が接合されるとき、ポリウレタン弾性繊維は６６．７ｍ／分で供給され１００ｍ／分で中間ローラーおよびニップロールで巻き取られるため、伸長率１．５倍で不織布と接合された。この結果、ポリウレタン弾性繊維は、ビーム巻取体を作製するときに伸長率２．０倍、不織布と接合されるときに伸長率１．５倍で伸長されているので、紡糸工程で１本ずつボビンに巻き取られたときの糸長（初期長）からは、３．０倍伸長された状態で２枚の不織布間に接合されたことになる。
(3) Stretch material 150 polyurethane elastic fibers were unwound and supplied from the polyurethane elastic fiber beam winder so that the yarn speed was 66.7 m / min. The two nonwoven fabric wound bodies were unwound and supplied so that the linear velocity of the nonwoven fabric was 100 m / min. Between the two supplied non-woven fabrics, a polyurethane elastic fiber that has been split into 2 mm pitches with a yarn dividing guide is arranged so as to be arranged in parallel, and a hot melt adhesive of 5 g / m 2 is applied by a curtain coating method. The adhered polyurethane elastic fiber is sandwiched between two nonwoven fabrics, passed through an intermediate roller with a peripheral speed of 100 m / min, and then passed between nip rolls with a linear pressure of 5 kgf / cm and a peripheral speed of 100 m / min. Polyurethane elastic fibers were joined. The nonwoven fabric bonded with polyurethane elastic fiber was wound around a paper tube at 100 m / min. When the nonwoven fabric and the polyurethane elastic fiber were joined, the polyurethane elastic fiber was fed at 66.7 m / min and wound up by an intermediate roller and a nip roll at 100 m / min. As a result, the polyurethane elastic fibers are stretched at an elongation rate of 2.0 times when producing the beam winder and at an elongation rate of 1.5 times when bonded to the nonwoven fabric, so that one by one in the spinning process. From the yarn length (initial length) when wound on the bobbin, the yarn is joined between the two nonwoven fabrics while being stretched 3.0 times.
（４）測定
ポリウレタン弾性繊維が接合された不織布を紙管から解舒したところ、３．０倍に伸長されたポリウレタン弾性繊維の収縮応力により、不織布に微細なギャザー様構造が発現し、一方向に伸縮する伸縮材料が得られた。伸縮材料を温度２０℃、湿度６５％ＲＨの室内に４８時間静置し、目付、厚み、伸び切り伸長率、往応力、及び復応力を測定し、以下の表１に示す結果を得た。なお、この伸縮材料の伸び切り伸長率は１５５％であったので、繰り返し伸縮試験における伸長率として１００％を採用した。
(4) Measurement When a nonwoven fabric bonded with polyurethane elastic fibers was unwound from a paper tube, a fine gather-like structure was developed in the nonwoven fabric due to the shrinkage stress of the polyurethane elastic fibers stretched 3.0 times. An elastic material that expands and contracts is obtained. The stretchable material was allowed to stand in a room at a temperature of 20 ° C. and a humidity of 65% RH for 48 hours, and the basis weight, thickness, elongation / extension rate, forward stress, and reverse stress were measured, and the results shown in Table 1 below were obtained. In addition, since the stretch elongation rate of this stretchable material was 155%, 100% was adopted as the stretch rate in the repeated stretch test.
［実施例２］
３ホールの紡口口金を使用して製造した３０ｄｔｅｘの繊度を持つポリウレタン弾性繊維を使用した以外は実施例１と同様の操作を行い、以下の表１に示す特性の伸縮材料を得た。なお、この伸縮材料の伸び切り伸長率は８５％であったので、繰り返し伸縮試験における伸長率として１００％を採用した。
[Example 2]
An elastic material having the characteristics shown in Table 1 below was obtained in the same manner as in Example 1 except that polyurethane elastic fibers having a fineness of 30 dtex produced using a three-hole spinneret were used. In addition, since the stretch elongation rate of this stretchable material was 85%, 100% was adopted as the stretch rate in the repeated stretch test.
［実施例３］
１６ホールの紡口口金を使用して製造した２４０ｄｔｅｘの繊度を持つポリウレタン弾性繊維を使用した以外は実施例１と同様の操作を行い、以下の表１に示す特性の伸縮材料を得た。
[Example 3]
An elastic material having the characteristics shown in Table 1 below was obtained in the same manner as in Example 1 except that a polyurethane elastic fiber having a fineness of 240 dtex produced using a 16-hole spinneret was used.
［実施例４］
ポリウレタン弾性繊維ビーム巻取体から、糸速度が９０．９ｍ／分となるようにポリウレタン弾性繊維を供給した以外は実施例１と同様の操作を行った。このとき、伸縮材料中のポリウレタン弾性繊維は、実施例１と同様の計算方法により、紡糸工程で１本ずつボビンに巻き取られた時の糸長（初期長）からは、２．２倍伸長された状態で２枚の不織布間に接合された。実施例１と同様の測定を行い、以下の表１に示す特性の伸縮材料を得た。
[Example 4]
The same operation as in Example 1 was performed except that the polyurethane elastic fiber was supplied from the polyurethane elastic fiber beam winder so that the yarn speed was 90.9 m / min. At this time, the polyurethane elastic fiber in the stretchable material was stretched 2.2 times from the yarn length (initial length) when wound one by one in the spinning process by the same calculation method as in Example 1. In this state, the two nonwoven fabrics were joined. The same measurement as in Example 1 was performed to obtain an elastic material having the characteristics shown in Table 1 below.
［実施例５］
ポリウレタン弾性繊維ビーム巻取体から、糸速度が５０ｍ／分となるようにポリウレタン弾性繊維を供給した以外は実施例１と同様の操作を行った。このとき、伸縮材料中のポリウレタン弾性繊維は、実施例１と同様の計算方法により、紡糸工程で１本ずつボビンに巻き取られた時の糸長（初期長）からは、４．０倍伸長された状態で２枚の不織布間に接合された。その後、実施例１と同様の測定を行い、以下の表１に示す特性の伸縮材料を得た。
[Example 5]
The same operation as in Example 1 was performed except that the polyurethane elastic fiber was supplied from the polyurethane elastic fiber beam winder so that the yarn speed was 50 m / min. At this time, the polyurethane elastic fiber in the stretchable material was stretched 4.0 times from the yarn length (initial length) when wound one by one in the spinning process by the same calculation method as in Example 1. In this state, the two nonwoven fabrics were joined. Then, the measurement similar to Example 1 was performed and the elastic material of the characteristic shown in the following Table 1 was obtained.
［実施例６］
ポリウレタンビーム巻取体を製造するときのポリウレタン弾性繊維のボビンを６０個とし、二つの不織布の間に、５ｍｍ間隔に平行にポリウレタン弾性繊維を配列させた以外は実施例１と同様の操作を行った。その後、実施例１と同様の測定を行い、以下の表１に示す特性の伸縮材料を得た。
[Example 6]
The same operation as in Example 1 was performed except that the number of bobbins of the polyurethane elastic fibers used for producing the polyurethane beam winding body was 60, and the polyurethane elastic fibers were arranged in parallel at intervals of 5 mm between the two nonwoven fabrics. It was. Then, the measurement similar to Example 1 was performed and the elastic material of the characteristic shown in the following Table 1 was obtained.
［実施例７］
ポリウレタンビーム巻取体を製造するときのポリウレタン弾性繊維のボビンを２５０個とし、二つの不織布の間に、１．２ｍｍ間隔に平行にポリウレタン弾性繊維を配列させた以外は実施例１と同様の操作を行った。その後、実施例１と同様の測定を行い、以下の表１に示す特性の伸縮材料を得た。
[Example 7]
The same operation as in Example 1 except that the number of bobbins of the polyurethane elastic fiber used for manufacturing the polyurethane beam winder was 250, and the polyurethane elastic fiber was arranged between the two nonwoven fabrics in parallel with an interval of 1.2 mm. Went. Then, the measurement similar to Example 1 was performed and the elastic material of the characteristic shown in the following Table 1 was obtained.
［実施例８］
ポリマーグリコールとして、テトラメチレン基と２，２−ジメチルプロピレン基からなる、数平均分子量２０００で２，２ジメチルプロピレン基の共重合率が１０モル％である共重合ポリアルキレンエーテルジオールを使用した以外は実施例５と同様の操作を行った。その後、実施例１と同様の測定を行い、以下の表１に示す特性の伸縮材料を得た。
[Example 8]
As the polymer glycol, except that a copolymer polyalkylene ether diol composed of a tetramethylene group and a 2,2-dimethylpropylene group and having a number average molecular weight of 2000 and a copolymerization ratio of 2,2 dimethylpropylene groups of 10 mol% is used. The same operation as in Example 5 was performed. Then, the measurement similar to Example 1 was performed and the elastic material of the characteristic shown in the following Table 1 was obtained.
［比較例１］
３２ホールの紡口口金を使用して製造した３２０ｄｔｅｘの繊度を持つポリウレタン弾性繊維を使用した以外は実施例６と同様の操作を行い、以下の表１に示す特性の伸縮材料を得た。この伸縮材料は厚みが大きく、往応力が高いものであった。
[Comparative Example 1]
An elastic material having the characteristics shown in Table 1 below was obtained in the same manner as in Example 6 except that polyurethane elastic fibers having a fineness of 320 dtex produced using a 32-hole spinneret were used. This stretchable material had a large thickness and a high outward stress.
［比較例２］
１６ホールの紡口口金を使用して製造した２４０ｄｔｅｘの繊度を持つポリウレタン弾性繊維を使用した以外は実施例７と同様の操作を行い、以下の表１に示す特性の伸縮材料を得た。この伸縮材料は厚みが大きく、往応力及び復応力が高いものであった。
[Comparative Example 2]
An elastic material having the characteristics shown in Table 1 below was obtained in the same manner as in Example 7 except that a polyurethane elastic fiber having a fineness of 240 dtex produced using a 16-hole spinneret was used. This stretchable material had a large thickness and high forward stress and reverse stress.
［比較例３］
弾性糸ビーム巻取体を作製するとき、ポリウレタン弾性糸の解舒糸速度を１３３ｍ／分として伸長率１．５倍で弾性糸ビーム巻取体を作製した以外は実施例４と同様の操作を行った。このとき、伸縮材料中のポリウレタン弾性繊維は、実施例１と同様の計算方法により、紡糸工程で１本ずつボビンに巻き取られた時の糸長（初期長）からは、１．６５倍伸長された状態で２枚の不織布間に接合された。その後、実施例１と同様の測定を行い、以下の表１に示す特性の伸縮材料を得た。この伸縮材料は伸び切り伸長率は４５％と低く、５０％繰り返し伸縮試験は測定できなかった。
[Comparative Example 3]
When producing the elastic yarn beam winding body, the same operation as in Example 4 was performed except that the elastic yarn beam winding body was produced at an elongation rate of 1.5 times with the unwinding speed of the polyurethane elastic yarn being 133 m / min. went. At this time, the polyurethane elastic fiber in the stretchable material is stretched 1.65 times from the yarn length (initial length) when wound one by one in the spinning process by the same calculation method as in Example 1. In this state, the two nonwoven fabrics were joined. Then, the measurement similar to Example 1 was performed and the elastic material of the characteristic shown in the following Table 1 was obtained. This stretchable material had a complete elongation rate as low as 45%, and a 50% repeated stretch test could not be measured.
本発明に係る伸縮材料は、身体への良好なフィット性能とずり落ち防止性能、柔らかくて肌触りが良く肌への刺激性が低い性能に加え、着用時にアウターに響きにくい薄さと軽さを実現することができ、使い捨ておむつ等の衛生材料として好適に利用可能である。 The elastic material according to the present invention realizes thinness and lightness that does not resonate with the outer when worn, in addition to good fit performance to the body and anti-slip performance, soft and soft touch and low skin irritation. It can be used suitably as sanitary materials such as disposable diapers.
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