JPH0734321A - Acrylic flat yarn and its production - Google Patents

Abstract

PURPOSE:To obtain acrylic flat yarn having an animal hair-like handle suitable for carpet and mat as well as bore and high pile and to attain its industrial and ready production. CONSTITUTION:This acrylic yarn is the one obtained by subjecting a copolymer having 40,000-50,000 molecular weight comprising 84-95wt.% of acrylonitrile, 0.7-3.0wt.% of a sulfonic group-containing vinyl-based monomer and 5-15wt.% of another vinyl-based monomer, to wet spinning and has >=4.5 long diameter/ short diameter ratio in cross section of the yarn.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】本発明は、アクリル系偏平繊維及
びその製造方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an acrylic flat fiber and a method for producing the same.

【０００２】[0002]

【従来の技術】従来、アクリル系合成繊維は最も獣毛調
風合、光沢を有する繊維として認められ、天然毛皮を想
定したボアー，シール等のイミテーションファー分野及
びハイパイル分野に汎く使用されている。2. Description of the Related Art Conventionally, acrylic synthetic fibers are recognized as fibers having the most animal-like texture and luster, and are widely used in the field of imitation fur such as bores and seals assuming natural fur and the field of high pile. .

【０００３】近年、風合・光沢をより天然の獣毛に近づ
けるため後加工や紡糸原液に各種添加剤を添加する等の
色々な改良が行われている。しかし、紡績性から考える
と加工剤を多量に添加することは好ましくなく、又効果
も洗濯及びドライクリーニングによる耐久性が無く一時
的なものである。これらの欠点を克服するためには、紡
糸原液段階での何らかの工夫が好ましい。例えば特公昭
５６−４４１６３号公報，特公昭５６−４４１６４号公
報にはアクリロニトリル（以下ＡＮと略称する）の共重
合体を有機溶剤に溶解させた紡糸原液に金属化合物とセ
ルローズ誘導体を添加する製造方法が記載されている。
これは金属化合物によるしゃへい効果とセルローズ誘導
体によるＡＮ共重合体との相分離効果の相乗作用で風
合，光沢を天然の獣毛に近ずけるというものである。後
加工に比べ、耐洗濯性，耐ドライクリーニング性に優れ
てはいるものの、光沢を天然の獣毛並にするには金属化
合物，セルローズ誘導体のうち特に金属化合物を多量に
添加しなければならない。しかし斯かる繊維は、繊維表
面に多量の金属化合物が露出しており著しく可紡性及び
紡績性の低下を惹き起こすという欠点を有している。
又、アクリル系繊維はボアー，ハイパイルの他に寝装
品，カーペット，マット，ニット用の素材としても汎く
認められており、最近ではこちらの商品でも獣毛調風合
（偏平断面）が望まれる様になってきた。しかし、特公
昭５６−４４１６３号公報，特公昭５６−４４１６４号
公報記載の繊維では耐熱性に劣り、後加工段階で様々な
問題点が出てくる。In recent years, various improvements such as post-processing and addition of various additives to the stock solution for spinning have been carried out in order to bring the texture and luster closer to that of natural animal hair. However, from the viewpoint of spinnability, it is not preferable to add a large amount of the processing agent, and the effect is temporary without temporary durability due to washing and dry cleaning. In order to overcome these drawbacks, some kind of device at the spinning dope stage is preferable. For example, JP-B-56-44163 and JP-B-56-44164 disclose a production method in which a metal compound and a cellulose derivative are added to a spinning dope prepared by dissolving a copolymer of acrylonitrile (hereinafter abbreviated as AN) in an organic solvent. Is listed.
This is to make the texture and luster closer to that of natural animal hair by the synergistic effect of the shielding effect of the metal compound and the phase separation effect of the cellulose derivative with the AN copolymer. Although it is superior in washing resistance and dry cleaning resistance to post-processing, it is necessary to add a large amount of a metal compound, especially a metal compound among cellulose compounds and cellulose derivatives, in order to make gloss equal to that of natural animal hair. However, such a fiber has a drawback that a large amount of a metal compound is exposed on the surface of the fiber, resulting in a marked decrease in spinnability and spinnability.
Acrylic fibers are also widely accepted as materials for bedding, carpets, mats, and knits, in addition to bores and high piles. Recently, animal hair-like texture (flat cross section) is desired for this product as well. Has become. However, the fibers described in JP-B-56-44163 and JP-B-56-44164 are inferior in heat resistance, and various problems occur in the post-processing stage.

【０００４】特開平２−１６９７１１号公報、特開平２
−１６９７１２号公報に、アクリロニトリルが８５重量
％以上である共重合体を用いた偏平繊維が開示されてい
るが、共に乾式紡糸に関する発明であり紡糸口金の長辺
／短辺比に比べ得られる繊維断面の長軸／短軸比は非常
に小さくなってしまう。Japanese Unexamined Patent Publication Nos. 2-169711 and 2
Japanese Unexamined Patent Publication No. 169712 discloses flat fibers using a copolymer containing 85% by weight or more of acrylonitrile, both of which are inventions relating to dry spinning, and fibers obtained in comparison with the long side / short side ratio of a spinneret. The long axis / short axis ratio of the cross section becomes very small.

【０００５】[0005]

【発明が解決しようとする課題】本発明者らはかかる現
状に鑑み、鋭意検討の結果本発明に到達した。本発明の
目的はボアー，ハイパイルのみならずカーペット，マッ
ト用途の獣毛調風合を有するアクリル系偏平繊維、及び
これを工業的容易に製造する方法を提供する事にある。DISCLOSURE OF THE INVENTION The present inventors have arrived at the present invention as a result of intensive studies in view of the present situation. It is an object of the present invention to provide an acrylic flat fiber having animal hair-like texture for use in not only bores and high piles but also carpets and mats, and a method for easily producing the same.

【０００６】[0006]

【課題を解決するための手段】すなわち、本発明のアク
リル系偏平繊維は、アクリロニトリル８４〜９５重量
％，スルホン酸基含有ビニル系モノマー０．７〜３．０
重量％及び他のビニル系モノマー５〜１５重量％よりな
り且つ分子量が４〜５万である共重合体を湿式紡糸して
なるアクリル系繊維であって、繊維横断面の長軸／短軸
比が４．５以上であることを特徴とする。That is, the acrylic flat fiber of the present invention comprises 84 to 95% by weight of acrylonitrile and 0.7 to 3.0 of a sulfonic acid group-containing vinyl monomer.
An acrylic fiber obtained by wet-spinning a copolymer having a molecular weight of 40,000 and 5 to 15% by weight and another vinyl monomer of 5 to 15% by weight, and having a long axis / short axis ratio of a fiber cross section. Is 4.5 or more.

【０００７】また本発明の製造方法は、アクリロニトリ
ルを８４〜９５重量％とスルホン酸基含有モノマー０．
７〜３．０重量％及び他のビニル系モノマー５〜１５重
量％よりなり且つ分子量が４〜５万である共重合体を重
合し、次いで該重合体とジメチルホルムアミド／水＝９
６／４〜９４／６（重量比）よりなる重合体濃度２５〜
３２％の紡糸原液を調製し、そして孔形状が矩形の口金
を用いてジメチルホルムアミド／水系よりなる凝固浴中
に紡糸ドラフト比０．６〜１．５で紡糸する事を特徴と
する。Further, according to the production method of the present invention, 84 to 95% by weight of acrylonitrile and a sulfonic acid group-containing monomer of 0.1.
A copolymer comprising 7 to 3.0% by weight and 5 to 15% by weight of another vinyl-based monomer and having a molecular weight of 40 to 50,000 is polymerized, and then the polymer and dimethylformamide / water = 9.
Polymer concentration of 25% from 6/4 to 94/6 (weight ratio)
A 32% spinning stock solution is prepared and is then spun in a coagulation bath consisting of a dimethylformamide / water system at a spinning draft ratio of 0.6 to 1.5 using a spinneret having a rectangular pore shape.

【０００８】本発明に使用するアクリロニトリル系共重
合体はアクリロニトリルを８４〜９５重量％とスルホン
酸基を含有しない他のビニル系モノマーを５〜１５重量
％共重合する。９５重量％を越えるとゲル化など操業性
が低下する。ここでアクリロニトリルが８４重量％未満
ではアクリル系繊維としての通常の物性，耐熱性が得ら
れない。又、スルホン酸基を含有しない他のビニル系モ
ノマーを５重量％以上共重合しないと、ゲル化し易くな
り操業性が低下する。一方１５重量％を越えると繊維の
物性，耐熱性が低下し、工業的に製造する事が著しく困
難になり、この点に関しては同業者ならば周知の事であ
る。ビニル系モノマーとしてはアクリル酸，メタクリル
酸，或いはこれらのアルキルエステル類，酢酸ビニル，
塩化ビニル，塩化ビニリデンが好ましい。The acrylonitrile copolymer used in the present invention is copolymerized with 84 to 95% by weight of acrylonitrile and 5 to 15% by weight of another vinyl monomer not containing a sulfonic acid group. If it exceeds 95% by weight, operability such as gelation is deteriorated. If the amount of acrylonitrile is less than 84% by weight, ordinary physical properties and heat resistance of the acrylic fiber cannot be obtained. Further, unless another vinyl monomer containing no sulfonic acid group is copolymerized in an amount of 5% by weight or more, gelation is likely to occur and the operability is deteriorated. On the other hand, if it exceeds 15% by weight, the physical properties and heat resistance of the fiber are deteriorated, and it becomes extremely difficult to industrially manufacture it. This point is well known to those skilled in the art. Vinyl monomers include acrylic acid, methacrylic acid, or their alkyl esters, vinyl acetate,
Vinyl chloride and vinylidene chloride are preferred.

【０００９】本発明に於いて特に重要なのはスルホン酸
基含有モノマー０．７〜３．０重量％（好ましくは１．
０〜２．０重量％）共重合している事と共重合体のジメ
チルホルムアミド（ＤＭＦ）／水 溶液中での濃度すな
わち紡糸原液を２５〜３２重量％に調製する点にある。
スルホン酸基含有モノマーとしてはメタリルスルホン
酸，アリルスルホン酸，２−アクリルアミド−２−メチ
ルプロパンスルホン酸及びそれらの塩がある。この中で
もメタリルスルホン酸のソーダ塩が重合初期にブロック
的に導入されるため共重合体をより親水サイドにする事
が出来、その結果、繊維断面が整い良好な光沢が得られ
るので好ましい。この技術思想については、本発明者ら
が先に提案した特公昭５３−９２９９号公報，特公昭５
３−９３００号公報、特公昭５３−２９７３４号公報に
記載の発明に基づいている。スルホン酸基含有モノマー
が０．７重量％未満では、共重合体の親水性が不足し断
面の崩れた繊維になるばかりでなく、失透し染色性も不
足する。一方３．０重量％を越えると、凝固工程で膠着
しやすくなり淡色での染色が困難になってくる。Particularly important in the present invention is 0.7 to 3.0% by weight (preferably 1.
0 to 2.0% by weight) and the concentration of the copolymer in a dimethylformamide (DMF) / water solution, that is, the spinning solution is adjusted to 25 to 32% by weight.
Examples of the sulfonic acid group-containing monomer include methallylsulfonic acid, allylsulfonic acid, 2-acrylamido-2-methylpropanesulfonic acid and salts thereof. Among them, the soda salt of methallyl sulfonic acid is introduced in a block manner at the initial stage of the polymerization, so that the copolymer can be made more hydrophilic side, and as a result, the fiber cross section is arranged and good gloss is obtained, which is preferable. Regarding this technical idea, the present inventors have previously proposed Japanese Patent Publication No. 53-9299 and Japanese Patent Publication No. 5-9.
It is based on the inventions described in JP-A-3-9300 and JP-B-53-29734. When the amount of the sulfonic acid group-containing monomer is less than 0.7% by weight, not only the hydrophilicity of the copolymer is insufficient and the fiber has a broken cross section, but also devitrification and dyeability are insufficient. On the other hand, if it exceeds 3.0% by weight, sticking tends to occur in the coagulation process, and it becomes difficult to dye a light color.

【００１０】共重合体の分子量（重量平均）は、４〜５
万であることが必要である。４万未満では繊維の強伸度
などの物性が劣り、一方５万を越えると紡糸原液の粘度
が高くなるため濃度を高くできず、脱溶媒量が大きくな
る分偏平形状が崩れやすくなる。The molecular weight (weight average) of the copolymer is 4-5.
It needs to be ten thousand. When it is less than 40,000, the physical properties such as the strength and elongation of the fiber are inferior, while when it exceeds 50,000, the viscosity of the spinning dope becomes high and the concentration cannot be increased, and the flattened shape tends to collapse due to the increase in the amount of desolvation.

【００１１】本発明に使用する共重合体の紡糸原液での
濃度は２５〜３２％に調製する。この濃度が２５％未満
では口金から吐出した際の脱溶媒量が多く、整った偏平
断面を得ることが困難となる。一方、３２％を越える
と、共重合体の分子量にもよるが、粘度が高くなり紡糸
原液がゲル化し易くなるばかりでなく、紡糸時の単糸切
れも多くなる。また紡糸原液の溶媒は、ＤＭＦ／水＝９
６／４〜９４／６（重量比）であることが必要である。
水添量が４％未満では、凝固工程でマクロボイドが多発
して失透し、形状も崩れる。一方６％を越えると、ゲル
化して紡糸が困難となる。The concentration of the copolymer used in the present invention in the spinning dope is adjusted to 25 to 32%. If this concentration is less than 25%, the amount of desolvation when discharged from the die is large, and it becomes difficult to obtain a flattened flat section. On the other hand, if it exceeds 32%, the viscosity becomes high and the spinning dope easily gels, but the number of single yarn breaks during spinning also increases, depending on the molecular weight of the copolymer. The solvent of the spinning dope is DMF / water = 9.
It is necessary to be 6/4 to 94/6 (weight ratio).
When the amount of hydrogenation is less than 4%, macrovoids frequently occur in the solidification step, devitrification occurs, and the shape also collapses. On the other hand, if it exceeds 6%, gelation occurs and spinning becomes difficult.

【００１２】上記共重合体の重合方法は通常知られてい
るビニル系単量体の重合方法であればいずれでも良い
が、溶液重合が品質，コスト的に好ましい。The above-mentioned copolymer may be polymerized by any of the known vinyl monomer-based polymerization methods, but solution polymerization is preferred in terms of quality and cost.

【００１３】本発明に使用する口金は孔形状が矩形状の
もので孔面積は繊維のデニールに合わせたものを適宜選
択する。かかる条件において、長辺／短辺比（Ａ）が
４．５以上である矩形状の口金を用いると、下記式を満
足する繊維横断面の長軸／短軸比（Ｂ）を有する偏平繊
維を湿式紡糸することにより製造することができる。 ０．８Ａ≦Ｂ≦Ａ 更に好ましい条件を選べば、下記式を満足する偏平繊維
も製造することができる。 ０．９Ａ≦Ｂ≦ＡThe die used in the present invention has a rectangular hole shape, and the hole area is appropriately selected according to the denier of the fiber. Under such conditions, if a rectangular die having a long side / short side ratio (A) of 4.5 or more is used, a flat fiber having a long axis / short axis ratio (B) of a fiber cross section satisfying the following formula: Can be produced by wet spinning. 0.8A ≦ B ≦ A If more preferable conditions are selected, flat fibers satisfying the following formula can be manufactured. 0.9A ≦ B ≦ A

【００１４】本発明は、紡糸ドラフト（巻取り速度／吐
出線速度の比 以下ｉ価と表記）を０．６〜１．５で引
き取る。本発明の繊維を得る上でｉ価は重要なファクタ
ーである。ｉ価が０．６未満で得られた繊維は、断面形
状が丸味を帯び良好な獣毛調風合が得られなくなる。逆
に１．５を越えると凝固浴中での切れが多発し、操業が
困難になる。凝固浴より導出された凝固糸条は、水洗又
は水洗と同時に延伸、又は水洗後延伸等の処理をした
後、乾燥緻密化させ、更に機械捲縮を付与させ種々の高
次加工を施す。In the present invention, a spinning draft (ratio of winding speed / discharge linear velocity, hereinafter referred to as i value) is taken at 0.6 to 1.5. The i-value is an important factor in obtaining the fiber of the present invention. The fibers obtained with an i value of less than 0.6 have a round cross-sectional shape and a good animal hair-like feel cannot be obtained. On the other hand, if it exceeds 1.5, breakage occurs frequently in the coagulation bath, making operation difficult. The coagulated yarn drawn out from the coagulation bath is subjected to various treatments such as washing with water or drawing at the same time as washing with water, or treatment after drawing with water, followed by drying and densification, and further mechanical crimping.

【００１５】本発明方法で製造されるアクリル系繊維
は、口金の形状を忠実に再現した偏平形状をしており、
その長軸／短軸比（Ｂ）は通常４．５〜１５程度であ
る。この比が４．５以上好ましくは６〜１５であれば、
織編物、糸などの繊維製品とした際良好な獣毛調風合い
が得られる。The acrylic fiber produced by the method of the present invention has a flat shape that faithfully reproduces the shape of the die,
The major axis / minor axis ratio (B) is usually about 4.5 to 15. If this ratio is 4.5 or more, preferably 6 to 15,
Good texture of animal hair can be obtained when it is made into textile products such as woven and knitted fabrics and yarns.

【００１６】[0016]

【実施例】以下、本発明の実施例について具体的に説明
すると共に、比較例を挙げ本発明の繊維が優れた特性を
有する事を明らかにする。EXAMPLES Examples of the present invention will be specifically described below, and Comparative Examples will be given to clarify that the fibers of the present invention have excellent properties.

【００１７】実施例１〜４，比較例１〜４ アクリロニトリル（ＡＮ）／メチルアクリレート（Ｍ
Ａ）／メタリルスルホン酸ソーダ（ＳＭＡＳ）＝８７．
３／１１．５／０．８のモノマー組成から成る、分子量
４万（数平均）のアクリル系共重合体のＤＭＦ／水（＝
９５．５／４．５）溶液を表１記載の濃度に調製し紡糸
原液とした。各々の原液を０．０５６×０．３３６ｍ
ｍ、２５，００２孔の矩形型口金を通して２０℃，６０
％のＤＭＦ溶液中へ表１記載のｉ価で紡出した。紡出し
た後、ＤＭＦ濃度が３０％，２０％，１５％と順次低下
する３個の浴槽にて脱溶剤と４．０倍の１次延伸を行っ
た後、６０℃の水洗槽にて十分洗浄し前オイル槽にて油
剤付着し、その後、１４０℃のホットローラーにて乾
燥，緻密化した。乾燥後は１１７℃の蒸熱にて１．３倍
の２次延伸及び１２０℃の蒸熱下で０．９倍の緊張収縮
を行い後オイル付着，クリンプ付与後，乾燥し、短糸７
ｄ繊維長１０２ｍｍのアクリル系偏平繊維を得た。Examples 1 to 4, Comparative Examples 1 to 4 Acrylonitrile (AN) / methyl acrylate (M
A) / sodium methallyl sulfonate (SMAS) = 87.
DMF / water (== 40,000 (number average) acrylic copolymer having a monomer composition of 3 / 11.5 / 0.8 (=
95.5 / 4.5) solution was prepared to the concentration shown in Table 1 to prepare a spinning dope. 0.056 x 0.336 m of each stock solution
m, through a rectangular die with 25,002 holes, 20 ° C, 60
% DMF solution was spun at the i-value shown in Table 1. After spinning, desolvation and primary stretching of 4.0 times were performed in three baths where the DMF concentration decreased sequentially to 30%, 20%, and 15%, and then a 60 ° C washing tank was sufficient. After cleaning, the oil agent was attached in the previous oil tank, and then dried and densified with a 140 ° C. hot roller. After drying, a secondary stretch of 1.3 times is performed by steaming at 117 ° C, and a tension shrinkage of 0.9 times is performed under steaming at 120 ° C, after which oil is attached, crimp is applied, and then dried.
d An acrylic flat fiber having a fiber length of 102 mm was obtained.

【００１８】この様にして得られたアクリル系合成繊維
をカードに通し開綿を得た。開綿を用いて５名の判定者
により官能検査を行い風合のそれぞれが天然獣毛に類似
した触感と光沢を有しているものを「◎」とし、やや類
似しているものを「○」、異なるものを「×」として三
段階で判定した。又、操業性の判定は実施例記載の条件
で製造した際の単糸切れ，ローラー巻き付きを総合して
「◎」，「○」，「△」，「×」の四段階で行った。The acrylic synthetic fiber thus obtained was passed through a card to obtain a cotton open. A sensory test was performed by 5 judges using open cotton, and those with a texture and gloss similar to those of natural animal hair were marked with "◎", and those with a slight similarity were marked with "○". , And different ones were evaluated as “x” in three stages. In addition, the operability was judged in four stages of "◎", "○", "△", and "×" in consideration of single yarn breakage and roller winding when manufactured under the conditions described in the examples.

【００１９】[0019]

【表１】 [Table 1]

【００２０】実施例５〜６，比較例５〜８ 表２記載のＡＮ／ＭＡ／ＳＭＡＳ組成比率から成る、分
子量４．５万のアクリル系共重合体を２８％のＤＭＦ／
水（＝９５．５／４．５）溶液に調製し紡糸原液とし
た。各々の原液を０．０５６×０．３３６ｍ／ｍ，１０
００孔の矩形型口金を通してｉ価１．０で２０℃，５８
％のＤＭＦ溶液中へ紡出した。紡出後、脱溶剤と延伸を
施し十分洗浄して油剤付与，乾燥，クリンプ付与して最
終的に１０ｄのアクリル系偏平繊維を得た。得られたア
クリル系偏平繊維をカードに通し開綿し風合と偏平比を
評価した。Examples 5-6, Comparative Examples 5-8 An acrylic copolymer having the composition ratio AN / MA / SMAS shown in Table 2 and having a molecular weight of 45,000 was added to 28% DMF /
A water (= 95.5 / 4.5) solution was prepared to prepare a spinning dope. 0.056 × 0.336m / m, 10 for each stock solution
Through a 00-hole rectangular die with an i value of 1.0 at 20 ° C, 58
% DMF solution. After spinning, desolvation and stretching were performed, and sufficient washing was performed to apply an oil agent, dry and crimp to finally obtain an acrylic flat fiber of 10d. The acrylic flat fiber thus obtained was passed through a card and opened to evaluate the texture and flatness ratio.

【００２１】[0021]

【表２】 [Table 2]

【００２２】比較例９，１０ アクリル系共重合体の分子量を３．４万とする以外、実
施例３と同様にしてアクリル系偏平繊維を製造したが、
強伸度に劣るものであった（比較例９）。アクリル系共
重合体の分子量を５．５万、重合体濃度を２５％とする
以外、実施例３と同様にしてアクリル系偏平繊維を製造
したが、紡糸原液の粘度が高いため紡糸が不安定で、ま
た脱溶媒が大きいため偏平形状が崩れやすい（比較例１
０）。Comparative Examples 9 and 10 Acrylic flat fibers were produced in the same manner as in Example 3 except that the acrylic copolymer had a molecular weight of 34,000.
It was inferior in strength and elongation (Comparative Example 9). An acrylic flat fiber was produced in the same manner as in Example 3 except that the acrylic copolymer had a molecular weight of 55,000 and a polymer concentration of 25%. However, spinning was unstable because the viscosity of the spinning dope was high. In addition, since the amount of desolvation is large, the flat shape is likely to collapse (Comparative Example 1
0).

【００２３】実施例７ ０．０３８×０．４５６ｍｍ、２５，００２孔の矩形型
口金を用いる以外、実施例３と同様にしてアクリル系偏
平繊維を製造した。得られた繊維の断面は長軸／短軸
（偏平比）１１．５で均一なものであり、一層良好な獣
毛調風合いを有していた。Example 7 An acrylic flat fiber was produced in the same manner as in Example 3 except that a rectangular die having 0.038 × 0.456 mm and 25,002 holes was used. The cross section of the obtained fiber was uniform with a major axis / minor axis (flatness ratio) of 11.5, and had a better animal hair texture.

【００２４】[0024]

【発明の効果】本発明の製造方法に従い特定組成のアク
リロニトリル系共重合体を用い、紡糸時の重合体のＤＭ
Ｆ濃度を２５〜３２％に調製し紡糸ドラフト０．６〜
１．５で紡糸する事でハイパイル，ボアー，カーペッ
ト，マット用途に好適な獣毛調風合を有するアクリル系
偏平繊維を工業的容易に製造出来る。INDUSTRIAL APPLICABILITY The acrylonitrile copolymer having a specific composition is used according to the production method of the present invention, and DM of the polymer at the time of spinning is used.
The F concentration is adjusted to 25 to 32% and the spinning draft is 0.6 to
By spinning at 1.5, it is possible to industrially easily manufacture an acrylic flat fiber having an animal hair-like texture suitable for high pile, bore, carpet and mat applications.

Claims (3)

【特許請求の範囲】[Claims] 【請求項１】 アクリロニトリル８４〜９５重量％、ス
ルホン酸基含有ビニル系モノマー０．７〜３．０重量％
及び他のビニル系モノマー５〜１５重量％よりなり且つ
分子量が４〜５万である共重合体を湿式紡糸してなるア
クリル系繊維であって、繊維横断面の長軸／短軸比が
４．５以上であることを特徴とするアクリル系偏平繊
維。1. Acrylonitrile 84 to 95% by weight, sulfonic acid group-containing vinyl monomer 0.7 to 3.0% by weight
And an acrylic fiber obtained by wet-spinning a copolymer having 5 to 15% by weight of another vinyl-based monomer and having a molecular weight of 40 to 50,000, and having a long axis / short axis ratio of 4 in the cross section of the fiber. An acrylic flat fiber characterized by having a value of 0.5 or more. 【請求項２】 アクリロニトリルを８４〜９５重量％と
スルホン酸基含有モノマー０．７〜３．０重量％及び他
のビニル系モノマー５〜１５重量％よりなり且つ分子量
が４〜５万である共重合体を重合し、次いで該重合体と
ジメチルホルムアミド／水＝９６／４〜９４／６（重合
比）よりなる重合体濃度２５〜３２％の紡糸原液を調製
し、そして孔形状が矩形の口金を用いてジメチルホルム
アミド／水系よりなる凝固浴中に紡糸ドラフト比０．６
〜１．５で紡糸する事を特徴とするアクリル系偏平繊維
の製造方法。2. A copolymer comprising 84 to 95% by weight of acrylonitrile, 0.7 to 3.0% by weight of a sulfonic acid group-containing monomer, and 5 to 15% by weight of another vinyl monomer and having a molecular weight of 40 to 50,000. A polymer is polymerized, and then a spinning stock solution having a polymer concentration of 25 to 32% is prepared, which comprises the polymer and dimethylformamide / water = 96/4 to 94/6 (polymerization ratio), and a spinneret having a rectangular hole shape. In a coagulation bath consisting of dimethylformamide / water system, a spinning draft ratio of 0.6
A method for producing an acrylic flat fiber, which comprises spinning at 1.5. 【請求項３】 長辺／短辺比（Ａ）が４．５以上である
矩形状の口金を用いて、下記式の繊維横断面の長軸／短
軸比（Ｂ）を有する偏平繊維を製造する請求項１記載の
方法。 ０．８Ａ≦Ｂ≦Ａ3. A flattened fiber having a long axis / short axis ratio (B) of a fiber cross section of the following formula is obtained by using a rectangular die having a long side / short side ratio (A) of 4.5 or more. The method according to claim 1, which is manufactured. 0.8A ≦ B ≦ A