JP2010065347A - Functional fiber - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a functional fiber which is a synthetic fiber, in particular, a non-olefin-based synthetic fiber such as polyester or nylon remarkably improving adhesiveness to other materials (a resin or metal etc.). <P>SOLUTION: (1) The functional fiber is obtained by forming a coated film containing an acid-modified polyolefin resin on the surface of a fiber comprising a thermoplastic resin, wherein the pick-up of the acid-modified polyolefin resin based on the fiber is 0.5-10% omf (on the mass of fiber). (2) The functional fiber is obtained by forming the coated film containing the acid-modified polyolefin resin and a polyurethane resin on the surface of the fiber comprising the thermoplastic resin, wherein the pick-up of the acid-modified polyolefin resin and polyurethane resin based on the fiber is 0.5-10% omf. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a functional fiber having a coating film containing at least an acid-modified polyolefin resin formed on the surface of the fiber and having improved adhesion to other materials, particularly olefin-based materials.

  Synthetic fiber itself or various textiles such as woven fabrics, knitted fabrics, nets, strings, ropes, and tegus using synthetic fibers are coated with various resins and functional chemicals to provide functionality and durability. It has been known for some time to perform ancillary processing by a technique such as dipping or laminating (for example, see Non-Patent Document 1).

  However, depending on the combination of the synthetic fiber and the incidental processing resin / chemical, the adhesiveness is insufficient, and the expected performance as a product is often not obtained. For this reason, conventionally, attempts have been made to improve the adhesiveness to the attached processing resin / chemical by applying some pretreatment to the synthetic fiber itself or the fiber product.

  For example, from a treatment that improves adhesion by simply removing the oil agent and dust adhering to the fiber surface, twisting the fiber, adding fluff, knitting and weaving, etc. By changing the form, unevenness is generated on the surface, a technique aiming at the so-called anchor effect due to the fiber biting into the resin, a technique in which a resin layer is provided on the front and back of the fabric through the gap of the mesh cloth, and the physical A technique for improving the adhesiveness by a typical treatment has been used for a long time.

  Further, in recent years, various studies have been made on the improvement in essential adhesion by modifying the surface of the single yarn constituting the fiber. For example, by introducing a polar functional group, an ionic functional group, and a reactive functional group, a hydrogen bond, an ionic bond, and a covalent bond are formed at the interface, respectively, and the adhesiveness is improved.

  As a method of surface modification treatment, dry treatment includes plasma treatment, corona treatment, ozone treatment, flame treatment, and recently, surface modification by irradiation with electron beam, excimer laser, ion beam, etc. . On the other hand, as a wet method, surface modification is performed by roughening the surface form by treatment on the fiber surface with an alkaline aqueous solution or various organic solvents. Various techniques have also been attempted for grafting of polymer chains onto the fiber surface, precoating, and modification by primer treatment.

  Of these techniques, coating the surface of the fiber with an agent that has adhesiveness and affinity for both fibers and ancillary processing resin, or applying a primer treatment, the target synthetic fiber and the ancillary processing resin / agent It is one of the representative methods because it can be dealt with by chemical examination while it is determined to some extent.

  For example, resorcin-formalin-latex, so-called RFL treatment, for the purpose of improving adhesion to rubber materials such as tires, resin belts and rubber hoses, is a typical pretreatment method for fibers such as nylon and polyester. In particular, in the case of polyester, it is typical to obtain a pretreated yarn (also referred to as a pre-coated yarn) aiming at further improvement of adhesion by adding, for example, an epoxy-based chemical agent to the oil during fiber production. One (see, for example, Patent Document 1).

  As described above, in synthetic fibers or fiber products, methods for bonding with other materials have been studied by various methods. Among them, as other materials, olefin-based materials having relatively low surface free energy such as polypropylene and polyethylene. Improving the adhesion of synthetic fibers when using is an issue that has been studied for some time.

  Olefin fibers can be used for synthetic fibers, but ordinary polyethylene and polypropylene are inferior in heat resistance compared to other general-purpose fibers such as polyester and nylon. to be influenced.

  For example, a core-sheath type composite fiber with polypropylene in the core and polyethylene in the sheath is proposed, and a mesh sheet with relatively strong intersection strength is proposed by melting the polyethylene in the sheath by heat treatment after weaving. There is also an example (for example, refer to Patent Document 2). In this example, polypropylene in the core part becomes the fiber, and polyethylene in the sheath part becomes the adhesive component, and the polypropylene fibers can be bonded relatively firmly. However, in the heat resistance as a product, the melting point of the olefin The above is not obtained.

However, olefin-based resins have excellent properties such as water resistance, chemical resistance, wear resistance, and flexibility, except for heat resistance, although they are relatively low cost. If the adhesiveness of the fiber is improved, it can be a technology having a very wide application range in the fiber field.
JP 2006-257598 A JP 2002-327353 A Textile Society, “Fiber Handbook” (Japan), 3rd edition, Maruzen Co., Ltd., December 15, 2004, pp. 132-134

  The present invention solves the above-mentioned problems, and is a synthetic fiber, particularly a non-olefin synthetic fiber such as polyester or nylon, which has dramatically improved adhesion to other materials (resin, metal, etc.). It is a technical problem to provide functional fibers that can be improved.

As a result of investigations to solve the above problems, the present inventors have reached the present invention. That is, the gist of the present invention is the following (1) to (2).
(1) A coating film containing an acid-modified polyolefin resin is formed on the surface of a fiber made of a thermoplastic resin, and the adhesion amount of the acid-modified polyolefin resin to the fiber is 0.5 to 10% omf. Functional fiber.
(2) A coating film containing an acid-modified polyolefin resin and a polyurethane resin is formed on the surface of a fiber made of a thermoplastic resin, and the adhesion amount of the acid-modified polyolefin resin and the polyurethane resin to the fiber is 0.5 to 10%. A functional fiber characterized by being omf.

  The functional fiber of the present invention is formed by forming a coating film containing at least an acid-modified polyolefin resin on the surface of a fiber made of a thermoplastic resin, and the adhesion amount of the acid-modified polyolefin resin to the fiber or the acid-modified polyolefin resin and polyurethane Since the adhesion amount of the resin to the fibers is within an appropriate range, the adhesion to the resin, particularly to other materials such as olefin resin and metal can be dramatically improved. For this reason, the functional fiber of the present invention and the product using the functional fiber of the present invention can be suitably coated, dipped, laminated, etc., and can be used for various applications and products.

Hereinafter, the present invention will be described in detail.
The functional fiber of the present invention improves adhesion particularly to an olefin-based material by forming a coating film containing at least an acid-modified polyolefin resin on the surface of a fiber made of a thermoplastic resin.

  The functional fiber of the present invention is made of a thermoplastic resin, but is preferably obtained by melt spinning or wet spinning the thermoplastic resin. Specifically, polyolefin fibers such as polyethylene and polypropylene, aromatic polyester fibers such as polyethylene terephthalate and polybutylene terephthalate, aliphatic polyester fibers such as polylactic acid, nylon 6, nylon 66, nylon 11, nylon 12, Nylon 610, Nylon 612, Nylon 46 and other aliphatic polyamide fibers, polyacrylonitrile fibers, polyvinyl alcohol fibers, regenerated fibers such as rayon, aromatic polyamide fibers, wholly aromatic polyester fibers, polyvinylidene chloride, poly Examples thereof include vinyl chloride, polyurethane-based, polyalkylene paraoxybenzoate-based, phenol-based, and polyfluoroethylene-based fibers.

  The functional fiber of the present invention has a coating film containing at least an acid-modified polyolefin resin on the surface of a fiber made of a thermoplastic resin, so that the fiber made of a thermoplastic resin has excellent performance (water resistance) Property, chemical resistance, wear resistance, flexibility, etc.) and adhesion to other materials, particularly olefin materials can be improved. For this reason, it is preferable to employ a non-olefin thermoplastic resin having excellent heat resistance and high elongation as the fiber made of the thermoplastic resin. Of these, highly versatile aliphatic polyamide fibers and aromatic polyester fibers are preferred.

  The functional fiber of the present invention is formed with a coating film containing an acid-modified polyolefin resin, and the adhesion amount of the acid-modified polyolefin resin to the fiber is 0.5 to 10% omf (omf: on the mass of fiber The abbreviated name represents the amount of adhesion to the fiber.)

  The adhesion amount of the acid-modified polyolefin resin to the fiber is 0.5 to 10% omf, preferably 0.8 to 8% omf, more preferably 1 to 5% omf.

  When the adhesion amount of the acid-modified polyolefin resin to the fiber is less than 0.5% omf, a good coating film is not formed on the surface of the fiber, and the effect of improving the adhesion to other materials, particularly olefin-based materials, cannot be achieved. . On the other hand, even if the adhesion amount exceeds 10% omf, further improvement of the adhesive strength cannot be expected. Rather, the operability in the fiber manufacturing process and the product processing process deteriorates, which is disadvantageous in terms of cost.

  Furthermore, in order to improve the adhesion of the functional fiber of the present invention to other materials such as olefin-based materials, a coating film containing an acid-modified polyolefin resin and a polyurethane resin is formed on the surface of the fiber made of a thermoplastic resin. Preferably it is formed.

  And the adhesion amount with respect to the fiber of acid-modified polyolefin resin and polyurethane resin (adhesion amount with respect to the fiber of both resin total) is 0.5-10% omf, Especially, it is 0.8-8% omf, Furthermore, 1-5% It is preferable that it is omf.

  When the adhesion amount of the acid-modified polyolefin resin and the polyurethane resin to the fiber is less than 0.5% omf, a good coating film is not formed on the surface of the fiber, and the effect of improving the adhesion to other materials, particularly olefin-based materials is exhibited. I can't. On the other hand, even if the adhesion amount exceeds 10% omf, further improvement of the adhesive strength cannot be expected. Rather, the operability in the fiber manufacturing process and the product processing process deteriorates, which is disadvantageous in terms of cost.

  Furthermore, when using together acid-modified polyolefin resin and polyurethane resin, it is preferable that these ratios are 1-6 weight part of polyurethane resins with respect to 10 weight part of acid-modified polyolefin resin.

  First, the acid-modified polyolefin resin will be described. The acid-modified polyolefin resin has good adhesion to fibers made of various thermoplastic resins, and can form a coating film on the surface of the fibers. And as another material, especially the adhesiveness to an olefin resin base material becomes favorable.

  The polyolefin resin constituting the acid-modified polyolefin resin preferably contains 0.1 to 25% by mass of an unsaturated carboxylic acid component from the viewpoint of adhesion between the coating film and the substrate. The content is more preferably 0.5 to 15% by mass, further preferably 1 to 8% by mass, and particularly preferably 1 to 5% by mass. The unsaturated carboxylic acid component is introduced by an unsaturated carboxylic acid or its anhydride. Specifically, acrylic acid, methacrylic acid, maleic acid, maleic anhydride, itaconic acid, itaconic anhydride, fumaric acid In addition to crotonic acid, half esters and half amides of unsaturated dicarboxylic acids.

  Of these, acrylic acid, methacrylic acid, maleic acid, and maleic anhydride are preferable, and acrylic acid and maleic anhydride are particularly preferable. Moreover, the unsaturated carboxylic acid component should just be copolymerized in polyolefin resin. The form is not limited, and examples thereof include random copolymerization, block copolymerization, and graft copolymerization.

  Examples of the olefin component of the polyolefin resin include alkenes having 2 to 6 carbon atoms such as ethylene, propylene, isobutylene, 1-butene, 1-pentene and 1-hexene, and mixtures thereof can also be used. Among these, alkenes having 2 to 4 carbon atoms such as ethylene, propylene, isobutylene and 1-butene are more preferable, and ethylene is particularly preferable. The content of the olefin component is preferably 50% by mass or more, and more preferably 70% by mass or more. When the content of the olefin component is less than 50% by mass, characteristics derived from the polyolefin resin such as adhesion to the substrate are lost.

  The polyolefin resin preferably contains a (meth) acrylic acid ester component from the viewpoint of improving the adhesiveness to the thermoplastic resin substrate, particularly the adhesiveness to a polyolefin substrate such as polypropylene. The content of the (meth) acrylic acid ester component is preferably 0.5 to 40% by mass. When the ratio of the (meth) acrylic acid ester component is less than 0.5% by mass, the effect of improving the adhesion to the polyolefin substrate is particularly poor, while the content of the (meth) acrylic acid ester component is 40% by mass. If it exceeds, the properties of the olefin-derived resin may be lost, and the adhesiveness to the substrate may be lowered.

  Examples of the acid-modified polyolefin resin include ethylene- (meth) acrylic acid copolymer, ethylene- (meth) acrylic acid-maleic anhydride copolymer, acid-modified polyethylene, acid-modified polypropylene, and acid-modified ethylene-propylene. Examples thereof include resins, acid-modified ethylene-butene resins, acid-modified propylene-butene resins, acid-modified ethylene-propylene-butene resins, or those obtained by further modifying these acid-modified resins with an acrylic ester or the like. The acid modification refers to modification (specifically, graft modification) with an unsaturated carboxylic acid such as maleic anhydride, maleic acid, itaconic anhydride, itaconic acid or the like.

  It is preferable to use an acid-modified polyolefin resin having a melt flow rate of 0.01 to 5000 g / 10 min at a temperature of 190 ° C. and a load of 20.2 N (2160 g), which is a measure of molecular weight. When the melt flow rate of the acid-modified polyolefin resin is less than 0.01 g / 10 min, the effect of improving the adhesion to the substrate is poor, while when the melt flow rate of the acid-modified polyolefin resin exceeds 5000 g / 10 min, the coating film Becomes hard and brittle, and it tends to be difficult to improve the adhesion to the substrate.

  Next, the polyurethane resin will be described. In order to improve the adhesion of the functional fiber of the present invention to other materials, it is preferable that the coating film contains a polyurethane resin together with the acid-modified polyolefin resin described above. The polyurethane resin is a polymer containing a urethane bond in the main chain, and is obtained, for example, by a reaction between a polyol compound and a polyisocyanate compound.

  In the present invention, the polyol component constituting the polyurethane resin is not particularly limited. For example, water, ethylene glycol, diethylene glycol, triethylene glycol, 1,3-butanediol, 1,4-butanediol, 1,2- Propanediol, 1,3-propanediol, 1,6-hexanediol, neopentyl glycol, 1,4-cyclohexanedimethanol, methyl-1,5-pentanediol, 1,8-octanediol, 2-ethyl-1 Low molecular weight glycols such as 1,3-hexanediol, diethylene glycol, triethylene glycol and dipropylene glycol, low molecular weight polyols such as trimethylolpropane, glycerin and pentaerythritol, ethylene oxide and propylene oxide Polyol compounds having, polyether diols, high molecular weight diols such as polyester diols, bisphenols such as bisphenol A, bisphenol F, dimer diol, and the like to the carboxyl group of the dimer acid was converted to hydroxyl groups.

  Further, as the polyisocyanate component, one or a mixture of two or more known diisocyanates of aromatic, aliphatic and alicyclic groups can be used. Specific examples of diisocyanates include tolylene diisocyanate, 4,4'-diphenylmethane diisocyanate, 1,3-phenylene diisocyanate, hexamethylene diisocyanate, xylylene diisocyanate, 1,5-naphthalene diisocyanate, isophorone diisocyanate, dimethyl diisocyanate, lysine diisocyanate. , Hydrogenated 4,4′-diphenylmethane diisocyanate, hydrogenated tolylene diisocyanate, dimerized isocyanate obtained by converting a carboxyl group of dimer acid into an isocyanate group, and adducts, biurets, and isocyanurates. As the diisocyanates, trifunctional or higher functional polyisocyanates such as triphenylmethane triisocyanate and polymethylene polyphenyl isocyanate may be used.

  In addition to the acid-modified polyolefin resin and polyurethane resin as described above, other components are blended in the coating film formed on the surface of the functional fiber of the present invention as long as the effect is not impaired. May be. For example, a component capable of improving compatibility with a thermoplastic resin constituting the functional fiber and a component capable of further improving adhesiveness may be contained. However, the ratio (content) of the acid-modified polyolefin resin or polyurethane resin in the coating film is preferably 90% by mass or more, particularly 95% by mass or more of the composition constituting the coating film.

  As described above, the functional fiber of the present invention is excellent in adhesiveness with other materials, and particularly excellent in adhesiveness with olefin-based materials. The adhesive strength measured in the test is preferably 10 mN / dtex or more, more preferably 15 mN / dtex or more, and further preferably 20 mN / dtex or more.

  The adhesion test in the present invention is a sample of 60 mm long fiber, low density polyethylene (LDPE), manufactured by Nippon Unicar Co., Ltd., NUC-8080, melt flow rate 7.5 g / 10 min, DSC melting point 108 ° C. Used to melt-coat LDPE with a length of 10 mm and a thickness of 2.0 mm from the end of the sample fiber. After LDPE is cooled and solidified, it is passed through a metal fitting having a hole of diameter: fiber diameter + 0.1 mm and depth: 1 mm. At this time, an uncoated portion (50 mm) of the LDPE of the sample fiber is passed. And the metal fiber and the metal fitting which has a hole are fixed to the scissors of a tensile testing machine (Shimadzu Corporation precision precision testing machine “AG-50kNI”), and the sample fiber is perpendicular to the hole at a speed of 50 mm / min. And pull the fiber from the coated LDPE. The maximum value (mN) of the strength at the time of drawing is measured with a tensile tester, and converted per unit fineness (dtex), and this value is taken as the adhesive strength (mN / dtex).

  Furthermore, the functional fiber of the present invention is preferably formed by coating the surface of the fiber with these resins when forming a coating film containing an acid-modified polyolefin resin or polyurethane resin. As an aqueous dispersion in which a modified polyolefin resin or polyurethane resin is dissolved or dispersed in a liquid medium, the aqueous dispersion is preferably obtained by coating the surface of a fiber made of a thermoplastic resin.

  At this time, as the liquid medium, it is not preferable to use a volatile organic solvent from the viewpoints of workability and environment, and it is preferable to use an aqueous medium from the viewpoint of excellent stability in terms of environment and liquid. The aqueous medium is water or a mixed solvent of water and a water-soluble organic solvent. That is, it is preferable to coat the fiber surface as a so-called aqueous dispersion in which the acid-modified polyolefin resin or polyurethane resin is dissolved or dispersed in an aqueous medium.

  Then, after coating the surface of the fiber with the aqueous dispersion containing the acid-modified polyolefin resin or polyurethane resin as described above, the aqueous medium is evaporated by drying, so that the amount of adhesion specified in the present invention is obtained. It is preferable to form a coating film.

  In the present invention, the acid-modified polyolefin resin or polyurethane resin as described above can be stably dispersed in an aqueous medium.

  Specifically, “Arrow Base” manufactured by Unitika Ltd. can be used as the aqueous dispersion containing acid-modified polyolefin resin or polyurethane resin.

  When coating the fiber surface with an aqueous dispersion containing an acid-modified polyolefin resin or polyurethane resin, a roller-type or slit-type oiling device is used at any stage when the thermoplastic resin is melt-spun and stretched. It is possible to employ a method of applying to the fiber surface. Among these, it is preferable to apply the film after stretching and before winding, and to perform winding after heat treatment such as running inside the heater.

  As a result, an aqueous dispersion containing an acid-modified polyolefin resin or a polyurethane resin can be applied and dried in the melt spinning and winding process, and there is no need for separate processing, and the acid-modified polyolefin resin and the polyurethane resin are uniformly coated. It is possible to obtain a fiber on which a coating film having a uniform film thickness is formed with good operability by a simple method.

  Of course, it is also possible to give to a fiber obtained by melt spinning and winding in a subsequent step. When a relatively large amount of adhesion is desired, it is preferable to apply a dipping process using a dipping machine. Since this processing can be performed at a lower speed than the above method, it is possible to perform drying for a relatively long time, and it is possible to increase the amount of adhesion.

  The functional fiber of the present invention may be either a monofilament or a multifilament, and may be either a long fiber or a short fiber. There are no particular limitations on the fineness, the number of single yarns, the cross-sectional shape such as a round cross-section, a modified cross-section, or a hollow fiber, or a composite form such as a core-sheath composite, side-by-side, or sea-island structure. Alternatively, false twisting, interlacing, indentation crimping (BCF processing), or the like may be performed.

  However, the functional fiber of the present invention is characterized in that the adhesiveness is improved from the conventional one even if the cross-sectional shape is irregular or the fiber form is not changed by processing. It is preferable to use it with a round cross section and a straight thread, which have a high strength per se and have little influence on processability to various fabrics.

  When the functional fiber of the present invention is a monofilament, a coating film containing an acid-modified polyolefin resin is formed on the surface of the monofilament. In the case of a multifilament, the surface of the multifilament contains an acid-modified polyolefin resin. In the case of a multifilament, it is preferable that a coating film containing an acid-modified polyolefin resin is formed on the surface of a single yarn constituting the multifilament.

Next, the present invention will be specifically described with reference to examples. The various characteristic values and evaluations in the examples were performed as follows.
(1) Strength and elongation JIS-L-1013 According to the method described in the standard test for tensile strength and elongation, use a constant speed extension type tester and measure at a grip interval of 20 mm and a pulling speed of 20 mm / min. Is.
(2) Adhesive strength Measured based on the adhesion test described above.
(3) Adhesion amount of acid-modified polyolefin resin or acid-modified polyolefin resin and polyurethane resin to fiber JIS-L-1013 Measured according to the method described in the ethanol-benzene extraction method for solvent extraction.

Example 1
As an aqueous dispersion containing an acid-modified polyolefin resin, “Arrow Base SE-1200 (manufactured by Unitika Ltd., solid content concentration 20%)” (aqueous dispersion 1) was used.
Polyethylene terephthalate multifilament (fineness: 1100 dtex, filament number: 192, strength: 8.4 cN / dtex, elongation: 16%, 100 T / M Z-twisted yarn: fiber A) was used as the fiber made of thermoplastic resin.
The aqueous dispersion 1 was dipped on the fiber A using a Ritzler computer treater, and subsequently dried at 110 ° C. for 30 seconds. And the functional fiber whose adhesion amount with respect to the fiber of the acid-modified polyolefin resin after drying was 3% omf was obtained.

Example 2
Except for using nylon 6 multifilament (fineness: 1000 dtex, number of filaments: 96, strength: 8.1 cN / dtex, elongation: 24%, 100 T / M Z-twisted yarn: fiber B) as a fiber made of thermoplastic resin The functional fiber was obtained in the same manner as in Example 1.

Example 3
Polyethylene terephthalate monofilament (fineness 1100 dtex, strength 7.5 cN / dtex, elongation 20%: fiber C) is used as the fiber made of thermoplastic resin, and the adhesion amount of the acid-modified polyolefin resin to the fiber is 1% omf. A functional fiber was obtained in the same manner as in Example 1 except that the dipping treatment was adjusted.

Example 4
Nylon 6 monofilament (fineness 1100 detex, strength 7.2 cN / dtex, elongation 30%: fiber D) is used as the fiber made of thermoplastic resin, and the adhesion amount of the acid-modified polyolefin resin to the fiber is 1% omf. A functional fiber was obtained in the same manner as in Example 1 except that the dipping treatment was adjusted.

Example 5
As an aqueous dispersion containing an acid-modified polyolefin resin and a polyurethane resin, “Arrow Base SE-1200 (manufactured by Unitika Ltd., solid content concentration 20%)” and an aqueous dispersion of polyurethane resin “Adeka Bon titer HUX-561 ( Adeka Co., Ltd., solid content concentration of 39%) ”was mixed with 10 parts by weight of SE-1200 and 1.5 parts by weight of HUX-561 (3 parts by weight of polyurethane resin with respect to 10 parts by weight of acid-modified polyolefin resin). (Aqueous Dispersion 2) was used. A functional fiber was obtained in the same manner as in Example 1 except that the adhesion amount of the acid-modified polyolefin resin and the polyurethane resin to the fibers (the adhesion amount of both resins to the fibers) was 3% omf.

Example 6
Example 2 except that the same aqueous dispersion 2 as in Example 5 was used, and the amount of adhesion of the acid-modified polyolefin resin and polyurethane resin to the fibers (the amount of adhesion of both resins to the fibers) was 3% omf. In the same manner, a functional fiber was obtained.

Example 7
Example 3 except that the same aqueous dispersion 2 as in Example 5 was used and the amount of adhesion of the acid-modified polyolefin resin and polyurethane resin to the fibers (the amount of adhesion of both resins to the fibers) was 1% omf. In the same manner, a functional fiber was obtained.

Example 8
Example 4 except that the same aqueous dispersion 2 as in Example 5 was used, and the amount of adhesion of the acid-modified polyolefin resin and polyurethane resin to the fibers (the amount of adhesion of both resins to the fibers) was 1% omf. In the same manner, a functional fiber was obtained.

Comparative Examples 1-4
The fibers (fibers A to D) themselves made of the thermoplastic resin used in Examples 1 to 4 were used.

Comparative Example 5
The same procedure as in Example 5 was performed except that the dipping treatment was adjusted so that the amount of adhesion of the acid-modified polyolefin resin and polyurethane resin to the fibers (the amount of adhesion of both resins to the fibers) was 0.1% omf.

Comparative Example 6
The same procedure as in Example 6 was performed except that the dipping treatment was adjusted so that the amount of adhesion of the acid-modified polyolefin resin and polyurethane resin to the fibers (the amount of adhesion of both resins to the fibers) was 0.1% omf.

Comparative Example 7
A functional fiber was prepared in the same manner as in Example 7 except that the dipping treatment was adjusted so that the amount of adhesion of the acid-modified polyolefin resin and polyurethane resin to the fibers (the amount of adhesion of both resins to the fibers) was 0.1% omf. Got.

Comparative Example 8
A functional fiber was prepared in the same manner as in Example 8 except that the dipping treatment was adjusted so that the amount of adhesion of the acid-modified polyolefin resin and polyurethane resin to the fibers (the amount of adhesion of both resins to the fibers) was 0.1% omf. Got.

Comparative Example 9
Performed in the same manner as in Example 5 except that dipping treatment and drying were performed twice so that the amount of adhesion of the acid-modified polyolefin resin and polyurethane resin to the fibers (the amount of adhesion of both resins to the fibers) was 20% omf. Sex fiber was obtained.

Comparative Example 10
Performed in the same manner as in Example 6 except that dipping treatment and drying were performed twice so that the amount of adhesion of the acid-modified polyolefin resin and polyurethane resin to the fibers (the amount of adhesion of both resins to the fibers) was 20% omf. Sex fiber was obtained.

  Tables 1 and 2 show the evaluation results of the functional fibers obtained in Examples 1 to 8 and Comparative Examples 1 to 10.

  As is clear from Tables 1 and 2, the functional fibers of Examples 1 to 4 were formed with a coating film containing an acid-modified polyolefin resin, and the amount of acid-modified polyolefin resin attached to the fibers was an appropriate amount. Regardless of the fiber material and fineness, the adhesive strength was high, and good adhesion to LDPE was exhibited. In the functional fibers of Examples 5 to 8, a coating film containing an acid-modified polyolefin resin and a polyurethane resin was formed, and the adhesion amount of the acid-modified polyolefin resin and the polyurethane resin to the fibers was an appropriate amount. High and showed better adhesion to LDPE.

On the other hand, the fibers of Comparative Examples 1 to 4 are those in which a coating film containing an acid-modified polyolefin resin is not formed, and the fibers of Comparative Examples 5 to 8 are attached to the fibers of the acid-modified polyolefin resin and the polyurethane resin. Therefore, all had low adhesive strength and poor adhesion to LDPE. Further, the fibers of Comparative Examples 9 to 10 were subjected to dipping treatment and drying twice so that the adhesion amount to the fibers of the acid-modified polyolefin resin and the polyurethane resin (adhesion amount to the fibers of both resins) was 20% omf. However, since the coating film was scraped by friction with the guide when passing through the process and fluff was frequently generated on the fiber surface, it was not possible to obtain a yarn having a sufficient yarn length.

Claims (6)

A function in which a coating film containing an acid-modified polyolefin resin is formed on the surface of a fiber made of a thermoplastic resin, and the adhesion amount of the acid-modified polyolefin resin to the fiber is 0.5 to 10% omf Sex fibers. A coating film containing an acid-modified polyolefin resin and a polyurethane resin is formed on the surface of the fiber made of a thermoplastic resin, and the adhesion amount of the acid-modified polyolefin resin and the polyurethane resin to the fiber is 0.5 to 10% omf. A functional fiber characterized by that. The functional fiber according to claim 1 or 2, wherein the adhesive strength measured by an adhesion test shown below is 10 mN / dtex or more.
[Adhesion test] A fiber having a length of 60 mm was used as a sample, low-density polyethylene (LDPE) having a length of 10 mm and a thickness of 2.0 mm from the end was melt-coated, cooled and solidified, and then diameter: fiber diameter + 0. It passes through a metal fitting having a hole of 1 mm and depth: 1 mm. At this time, an uncoated portion (50 mm) of the LDPE of the sample fiber is passed. And the metal fitting which has a fiber and a hole is fixed to the scissors of a tensile tester, a sample fiber is pulled at a speed | rate of 50 mm / min perpendicularly to a hole, and a fiber is extracted from LDPE. The maximum value (mN) of the strength at the time of drawing is measured with a tensile tester, and converted per unit fineness (dtex), and this value is taken as the adhesive strength (mN / dtex). The functional fiber according to claim 1 or 3, wherein the functional fiber is obtained by applying an aqueous dispersion containing an acid-modified polyolefin resin to a fiber surface made of a thermoplastic resin. The functional fiber according to claim 2 or 3, which is obtained by applying an aqueous dispersion containing an acid-modified polyolefin resin and a polyurethane resin to a fiber surface made of a thermoplastic resin. The functional fiber according to any one of claims 1 to 5, wherein the thermoplastic resin is a non-olefin thermoplastic resin.