Classifications

• • D—TEXTILES; PAPER
  • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
  • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
  • D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
  • D01F6/58—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolycondensation products
  • D01F6/60—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolycondensation products from polyamides
• • D—TEXTILES; PAPER
  • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
  • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
  • D01D5/00—Formation of filaments, threads, or the like
  • D01D5/08—Melt spinning methods
• • D—TEXTILES; PAPER
  • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
  • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
  • D01D5/00—Formation of filaments, threads, or the like
  • D01D5/08—Melt spinning methods
  • D01D5/088—Cooling filaments, threads or the like, leaving the spinnerettes
• • D—TEXTILES; PAPER
  • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
  • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
  • D01D5/00—Formation of filaments, threads, or the like
  • D01D5/08—Melt spinning methods
  • D01D5/088—Cooling filaments, threads or the like, leaving the spinnerettes
  • D01D5/0885—Cooling filaments, threads or the like, leaving the spinnerettes by means of a liquid
• • D—TEXTILES; PAPER
  • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
  • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
  • D01D5/00—Formation of filaments, threads, or the like
  • D01D5/08—Melt spinning methods
  • D01D5/098—Melt spinning methods with simultaneous stretching
• • D—TEXTILES; PAPER
  • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
  • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
  • D01D5/00—Formation of filaments, threads, or the like
  • D01D5/12—Stretch-spinning methods
  • D01D5/16—Stretch-spinning methods using rollers, or like mechanical devices, e.g. snubbing pins
• • D—TEXTILES; PAPER
  • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
  • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
  • D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
  • D01F6/88—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polycondensation products as major constituent with other polymers or low-molecular-weight compounds
  • D01F6/90—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polycondensation products as major constituent with other polymers or low-molecular-weight compounds of polyamides
• • D—TEXTILES; PAPER
  • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
  • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
  • D01D4/00—Spinnerette packs; Cleaning thereof
  • D01D4/02—Spinnerettes
• • D—TEXTILES; PAPER
  • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
  • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
  • D10B2331/00—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products
  • D10B2331/02—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products polyamides
• • D—TEXTILES; PAPER
  • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
  • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
  • D10B2401/00—Physical properties
  • D10B2401/06—Load-responsive characteristics
  • D10B2401/063—Load-responsive characteristics high strength
• • D—TEXTILES; PAPER
  • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
  • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
  • D10B2507/00—Sport; Military

Definitions

• the present invention relates to a polyamide 4 monofilament and a method for producing the same.
• Polyamide 4 (hereinafter also referred to as "PA4") is expected to be put into practical use as a bioplastic, for example, in filaments used for fishing lines and fishing nets. Straight and knot strength and transparency are important properties required for such filaments.
• the undrawn yarn formed in the extrusion process of melt spinning be in an amorphous state, that is, have a low density.
• the spinning temperature since PA4 can be thermally decomposed during melt spinning, the spinning temperature must be close to the melting temperature. Spinning near the melting temperature increases the number of residual crystal nuclei and increases the crystallization rate during the cooling process after the extrusion process. Therefore, it is difficult to produce an amorphous monofilament.
• An object of one aspect of the present invention is to provide a low-density PA4 monofilament.
• a monofilament according to one aspect of the present invention is a polyamide 4 monofilament having a density of 1.230 g/cm 3 or less.
• a method for producing a monofilament according to an aspect of the present invention includes a melt extrusion step of melt extruding polyamide 4, and a fibrous melt extrudate of polyamide 4 obtained by the melt extrusion step. and a cooling step of cooling to ⁇ 10° C. or lower with a non-polar solvent.
• a PA4 monofilament with low density can be provided.
• PA4 polyamide 4
• PA4 is a polymer compound having a structural unit represented by the following formula (1). x in the following formula is 4.
• PA4 may be the only polymeric compound that constructs the monofilament fiber structure.
• components other than PA4 may be further contained as long as the effects of the present embodiment can be obtained.
• Such other ingredients may be one or more and examples include reinforcing agents, plasticizers, lubricants and stabilizers.
• the other component may contain a polymer compound other than PA4. The other component is appropriately used in an amount such that the effect of the other component is further exhibited.
• the monofilaments of embodiments of the present invention are PA4 monofilaments.
• the density of the monofilaments of embodiments of the invention is 1.230 g/cm 3 or less.
• Monofilament density correlates with monofilament crystallinity, with lower densities tending to have lower crystallinity.
• a density of the monofilament of 1.230 g/cm 3 corresponds to a degree of crystallinity of the monofilament of approximately 10%. If the density of the monofilament is high, the monofilament may have insufficient tensile strength and elongation when knotted.
• the density of the monofilament is preferably 1.225 g/cm 3 or less, more preferably 1.223 g/cm 3 or less.
• the density of the monofilament may be within a range that can be realized as a PA4 monofilament, and may be, for example, 1.215 g/cm 3 or more.
• the density of monofilaments can be obtained by a method called the "density gradient method". Also, the density of the monofilament can be adjusted by the cooling conditions in the production of the undrawn yarn, and can be reduced, for example, by cooling in the cooling step of the production method to be described later.
• the monofilament of the embodiment of the present invention only needs to have the physical properties described above, and may further have physical properties other than those described above as long as the effects of the present embodiment described above are achieved.
• the thread diameter of the monofilament of the embodiment of the present invention may be appropriately determined according to the use of the monofilament, but from the viewpoint of sufficiently reducing the density of the monofilament, it is preferably 1 mm or less.
• the diameter of the monofilament referred to here is the diameter of the undrawn yarn.
• the thread diameter of the monofilament is preferably 0.8 mm or less, more preferably 0.5 mm or less.
• the thread diameter of the monofilament may be within a range that can be realized with the PA4 monofilament depending on the use of the monofilament, but from the viewpoint of sufficiently performing the above cooling, it may be 0.1 mm or more. .
• the thread diameter of the monofilament can be adjusted by the hole diameter of the die.
• the thread diameter of the monofilament can be measured by a known technique for measuring the fiber diameter, for example, it can be measured by a known method of sandwiching the fiber and measuring the thread diameter of the fiber.
• the thread diameter of the monofilament tends to be reduced by increasing the draw ratio in the manufacturing method described below.
• the diameter of the monofilament in the embodiment of the present invention is a drawn yarn
• the diameter of the monofilament is more preferably 0.4 mm or less, more preferably 0.25 mm, from the viewpoint of sufficiently reducing the density of the monofilament in the undrawn yarn.
• the thread diameter of the drawn monofilament may be, for example, 0.05 mm or more from the viewpoint of practical use as a monofilament depending on the application.
• the thread diameter of the monofilament, which is the drawn thread can be adjusted by the draw ratio.
• the tensile strength at knotting of the stretched monofilament of the embodiment of the present invention is preferably 460 MPa or more from the viewpoint of achieving sufficient tensile strength in applications where the monofilament can be used in a knotted state. Applications that can be used in a knotted state are, for example, fishing lines.
• the tensile strength at the time of knotting can be appropriately determined according to the use of the monofilament.
• the tensile strength at knotting is preferably high from the viewpoint of preventing the monofilament from breaking at the knotting point when pulled, for example, it is more preferably 470 MPa or more, and further preferably 480 MPa or more.
• the tensile strength when knotted may be within a range that can be achieved with a PA4 monofilament, and from this point of view, the tensile strength when knotted may be 800 MPa or less.
• the tensile strength of a monofilament when knotted can be measured using a known device capable of performing fiber tensile tests.
• the tensile strength of the monofilament when knotted can be made sufficiently high by setting the density of the monofilament within the range described above.
• the knotting tensile strength of the monofilament can be increased by drawing during the production of the monofilament.
• the stretched monofilament of the embodiment of the present invention has a tensile elongation of 10% or more at the time of knotting from the viewpoint of preventing breakage when used in a knotted state.
• the tensile elongation at the time of knotting can be appropriately determined according to the use of the monofilament, and from the above viewpoint, it is more preferably 12% or more, further preferably 14% or more.
• the tensile elongation at the time of knotting may be within a range that can be achieved with the PA4 monofilament, and from this point of view, the tensile elongation at the time of knotting may be 30% or less.
• the tensile elongation of a monofilament at the time of knotting can be measured using a known device capable of performing fiber tensile tests.
• the tensile elongation of the monofilament at the time of knotting can be made sufficiently high by setting the density of the monofilament within the range described above.
• the tensile elongation of the monofilament at the time of knotting can be increased by drawing during the production of the monofilament.
• PA4 has a specific orientation from the viewpoint of enhancing the tensile properties of the monofilament.
• the monofilament preferably has a birefringence of 50 ⁇ 10 ⁇ 3 or more.
• Birefringence in a fiber material is a measure of the degree of orientation of the polymer chains in the polymer compound that constitutes the fiber with respect to the fiber axis direction. The greater the absolute value of birefringence, the greater the degree of orientation in the fiber of the polymer compound.
• the birefringence of the monofilament is more preferably 55 ⁇ 10 ⁇ 3 or more, further preferably 60 ⁇ 10 ⁇ 3 or more.
• the birefringence of the monofilament in the embodiment of the present invention may be within a range that can be achieved with a PA4 monofilament, and from this point of view, it may be 90 ⁇ 10 ⁇ 3 or less.
• the birefringence of a monofilament can be determined, for example, by retardation measurement using a polarizing microscope equipped with a Berek compensator and using a sodium lamp as the light source. Moreover, the birefringence of the monofilament can be adjusted by adjusting the degree of orientation of PA4 in the monofilament, and can be increased by increasing the draw ratio in the production method described below.
• the method for producing a monofilament in the embodiment of the present invention includes a melt extrusion step of melt extruding polyamide 4, and a nonpolar solvent to cool the fibrous melt extrudate of polyamide 4 by the melt extrusion step to ⁇ 10 ° C. or less. and These steps can be carried out by a known melt-spinning technique for producing an undrawn yarn by liquid cooling, as long as the conditions described later are satisfied.
• the melt-kneaded PA4 is extruded to form a fibrous melt extrudate of PA4.
• the spinning temperature in the melt extrusion step is preferably high from the viewpoint of reducing the crystal nuclei of PA4 in the melt extrudate. From such a viewpoint, the spinning temperature is preferably 255° C. or higher, more preferably 260° C. or higher, and even more preferably 262° C. or higher, in terms of resin temperature. On the other hand, the spinning temperature is preferably low from the viewpoint of suppressing thermal decomposition of PA4. From such a viewpoint, the spinning temperature is preferably 275° C. or lower, more preferably 270° C. or lower, and even more preferably 267° C. or lower, in terms of resin temperature.
• the cooling temperature of the molten extrudate with the non-polar solvent in the cooling step is -10°C or lower. If the cooling temperature is too high, the density of the undrawn yarn may become too high.
• the cooling temperature is preferably ⁇ 15° C. or lower, more preferably ⁇ 20° C. or lower, from the viewpoint of sufficiently reducing the density of the undrawn yarn.
• the cooling temperature can be appropriately determined according to the type of refrigerant liquid and the manufacturing cost within the range in which the effects of the present embodiment can be obtained. It may be 60° C. or higher.
• the cooling time is preferably long, more specifically, preferably 0.1 seconds or more, and 0.2 seconds or more, from the viewpoint of reducing the density of the undrawn yarn. is more preferable, and 0.3 seconds or longer is even more preferable.
• the cooling time is preferably short from the viewpoint of productivity, and from such a viewpoint, it is preferably 5 seconds or less, more preferably 3 seconds or less, and even more preferably 2 seconds or less.
• Nonpolar solvent is substantially inert to the PA4 melt extrudate from the viewpoint of preventing surface roughness or whitening of the undrawn yarn.
• substantially inert means that it does not substantially act on the melt extrudate, more specifically, it is poorly soluble or insoluble in PA4, and the melt extrudate of PA4 and having no permeability.
• the melting point (Tm) of the nonpolar solvent is preferably ⁇ 20° C. or lower, and the boiling point (Tb) of the nonpolar solvent is 100° C. or higher. preferable.
• One or more nonpolar solvents may be used. Examples of nonpolar solvents include silicone oil, hexane, nonane, decane, ethylcyclohexane, isopropylcyclohexane, toluene and p-cymene. Table 1 shows examples of non-polar solvents and their melting and boiling points.
• the method for producing a monofilament according to the embodiment of the present invention may further include other steps than the melt extrusion step and the cooling step as long as the effect of the embodiment of the present invention can be obtained.
• the manufacturing method may further include a step of drawing the monofilament cooled in the cooling step (drawing step). The drawing process is more effective from the viewpoint of enhancing the tensile properties of the monofilament.
• the stretching process may be dry heat stretching or wet heat stretching.
• the stretching step may be performed only once, or may be performed multiple times.
• the stretching temperature in the stretching step can be appropriately set within the range of 40 to 240° C. depending on the aspect of the stretching step.
• the final draw ratio in the drawing process can be appropriately set within the range of 3.5 to 6 times depending on the mode of the drawing process.
• "-" indicates a range of values including both ends of the range.
• the drawing temperature may be 150 to 240° C. (eg, 200° C.), and the draw ratio may be 3.5 to 5 times (eg, 4 times). you can Further, for example, if the aspect of the drawing step is two hot drawing, the drawing temperature in the first hot drawing may be 40 to 80° C. (eg, 60° C.), and the draw ratio is 2.5 to 2.5. It may be 3.5 times (eg, 3 times).
• the stretching temperature in the second dry heat stretching may be 150 to 240° C. (eg, 200° C.), and the stretching ratio may be 1.05 to 2.0 times (eg, 1.33 times).
• the fibrous molten extrudate is usually pulled at a speed higher than the discharge speed of the molten extrudate, cooled, and supplied to the subsequent drawing device.
• the pulling of the melt extrudate for supplying from the melt extrusion process to the cooling process and the subsequent drawing process is not included in the drawing process, and is appropriately within the range where the effect of the present embodiment can be obtained. can be set to
• a monofilament in an embodiment of the present invention is a monofilament substantially composed of PA4 described above and having a density of 1.230 g/cm 3 or less.
• Monofilaments with lower densities have higher tensile properties at knotting than monofilaments with higher densities.
• monofilaments with improved tensile properties at knotting can be achieved, and more specifically, monofilaments with high tensile strength and tensile elongation at knotting can be achieved. be able to.
• a method for producing a monofilament according to an embodiment of the present invention includes a melt extrusion step of melt extruding a monofilament and a cooling step of cooling the melt extruded monofilament to ⁇ 10° C. or below with a nonpolar solvent. According to this configuration, a monofilament having a density of 1.230 g/cm 3 or less can be produced.
• the monofilament diameter By sufficiently reducing the diameter of the undrawn monofilament yarn, it is possible to fully exhibit the cooling effect in the cooling step. From this point of view, it is advantageous for the monofilament diameter to be 1 mm or less, for example. be.
• the nonpolar solvent in embodiments of the present invention can be selected from the group consisting of silicone oil, hexane, nonane, decane, ethylcyclohexane, isopropylcyclohexane, toluene and p-. These non-polar solvents are suitable from the viewpoint of stability as a refrigerant liquid in the cooling step.
• the method for manufacturing a monofilament in the embodiment of the present invention further includes a step of drawing the cooled monofilament in the cooling step, it can develop sufficient tensile properties applicable to applications such as fishing lines or fishing nets.
• the monofilament of the embodiment of the present invention is a polyamide 4 monofilament having a density of 1.230 g/cm 3 or less.
• the method for producing a monofilament in the embodiment of the present invention includes a melt extrusion step of melt extruding polyamide 4, and a fibrous melt extrudate of polyamide 4 obtained by the melt extrusion step is cooled to ⁇ 10 ° C. or less with a nonpolar solvent. and a cooling step.
• the diameter of the monofilament may be 1 mm or less. This configuration is much more effective from the viewpoint of enhancing the tensile properties of the monofilament.
• the nonpolar solvent may be one or more solvents selected from the group consisting of silicone oil, hexane, nonane, decane, ethylcyclohexane, isopropylcyclohexane, toluene and p-cymene.
• the method for manufacturing a monofilament according to the embodiment of the present invention may further include the step of drawing the monofilament cooled in the cooling step. This configuration is much more effective from the viewpoint of obtaining a monofilament having excellent tensile properties.
• Example 1 At room temperature, 2 mol % of potassium tert-butoxide was added to ⁇ -pyrrolidone and stirred in a polymerization vessel. After dissolving potassium tert-butoxide, 2 mol % of tetramethylammonium chloride as a polymerization aid and 0.1 mol % of N,N'-adipyldipyrrolidone as an initiator were added. After the addition, the system became cloudy and soon became difficult to stir. After 72 hours from stopping the stirring, the lumps formed in the flask were taken out and crushed. Unreacted substances and low-molecular-weight substances were washed with acetone. Powdered PA4 was obtained by drying the washed pulverized material. The weight average molecular weight (Mw) of PA4 obtained was 140,000.
• the Mw of PA4 was measured using the following procedure, analyzer and conditions. [Measurement procedure] After dissolving 10 mg of the PA4 sample obtained as described above in hexafluoroisopropanol (HFIP) in which sodium trifluoroacetate was dissolved at a concentration of 5 mM to make 10 cm 3 , the solution was filtered through a membrane filter to obtain a sample solution. rice field. 10 ⁇ L of this sample solution was injected into the analyzer shown below, and the weight average molecular weight of PA4 was measured under the measurement conditions described later.
• HFIP hexafluoroisopropanol
• GPC device Tosoh HLC-8420GPC [Measurement condition]
• F) dn/dc 0.240
• PA4 is molded into a fiber by melt extrusion at a temperature of 265 ° C., and the obtained fibrous melt extrudate is volatile silicone oil ("KF-995", manufactured by Shin-Etsu Silicone Co., Ltd.) at -20 ° C. immediately after molding. It cooled and solidified by passing through the bath for 0.3 seconds. Thus, an undrawn PA4 monofilament yarn having a yarn diameter of 340 ⁇ m was produced. The density of undrawn yarn was measured by the following measuring method. The density of the undrawn yarn was 1.220 g/cm 3 .
• the density of the undrawn yarn was obtained by the density gradient method.
• the solvent six kinds of mixed solvents were used, the density of which was adjusted between 1.20 and 1.30 g/cm 3 in increments of 0.02 by changing the mixing ratio of heptane and carbon tetrachloride.
• the produced undrawn yarn was drawn by dry heat drawing at a draw temperature of 60°C and a draw ratio of 3.0 times.
• the film was stretched by dry heat stretching at a stretching temperature of 200° C. and a stretching ratio of 1.33 times (total stretching ratio of 4.0 times).
• the humidity of the dry heat drawing atmosphere was 10% RH or less.
• Example 2 A monofilament was produced in the same manner as in Example 1, except that the diameter of the undrawn yarn was changed to 480 ⁇ m. The density of the undrawn yarn was 1.220 g/cm 3 .
• Example 3 A monofilament was produced in the same manner as in Example 1, except that the refrigerant was changed to hexane and the temperature of the refrigerant was changed to -55°C. The density of the undrawn yarn was 1.219 g/cm 3 .
• Example 4 A monofilament was produced in the same manner as in Example 1, except that the coolant was changed to toluene and the temperature of the coolant was changed to -50°C. The density of the undrawn yarn was 1.219 g/cm 3 .
• Example 1 A monofilament was produced in the same manner as in Example 1, except that the coolant was changed to water and the temperature of the coolant was changed to 4°C. Due to the surface roughness of the undrawn yarn, the density of the undrawn yarn could not be measured. In addition, due to the surface roughness of the undrawn yarn, drawing breakage occurred in the subsequent drawing, and no drawn yarn was obtained.
• Example 2 A monofilament was produced in the same manner as in Example 1, except that the coolant was changed to tetradecane and the temperature of the coolant was changed to 40°C. The density of the undrawn yarn was 1.240 g/cm 3 .
• Example 3 A monofilament was produced in the same manner as in Example 1, except that the temperature of the coolant was changed to 40°C. The density of the undrawn yarn was 1.240 g/cm 3 .
• the yarn diameters of the drawn yarns of Examples 1 to 4 and Comparative Examples 1 to 3 were found to be 170 to 240 ⁇ m in the same manner as the yarn diameters of the undrawn yarns.
• the densities of the drawn yarns of Examples 1 to 4 and Comparative Examples 1 to 3 were found to be 1.246 to 1.250 g/cm 3 in the same manner as the densities of the undrawn yarns.
• the birefringence of the drawn yarns of Examples 1 to 4 and Comparative Examples 1 to 3 was determined to be 58 ⁇ 10 ⁇ 3 to 67 ⁇ 10 ⁇ 3 .
• the birefringence of PA4 in the drawn yarn was obtained by measuring the retardation using a polarizing microscope equipped with a Berek compensator and using a sodium lamp as the light source.
• Table 2 shows the manufacturing conditions and density of the undrawn yarns, and the tensile strength and tensile elongation of the drawn yarns at knotting in the above examples and comparative examples.
• Comparative Example 1 the surface of the undrawn yarn was roughened. This is presumably because water was used as a coolant, and undrawn PA4 yarn was dissolved or wetted in water during cooling. Moreover, in Comparative Example 1, the undrawn yarn could not be drawn. It is considered that this is because the strength of the undrawn yarn was lowered due to the surface roughness and dissolution and moisture absorption of the undrawn yarn.
• Comparative Examples 2 and 3 the density of the undrawn yarn is low. Moreover, in Comparative Examples 2 and 3, the tensile strength and tensile elongation of the drawn yarn at the time of knotting are both lower than those of Example 1. This is probably because the cooling temperature in the production of the undrawn yarn was too high, promoting the crystallization of PA4 in the undrawn yarn.
• the PA4 monofilament of the present invention can be used as a synthetic fiber with excellent tensile properties, and according to the present invention, it is expected that the use of the synthetic fiber will further reduce the burden on the environment.

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• 2022
  • 2022-05-20 JP JP2023527595A patent/JP7570514B2/ja active Active
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  • 2022-05-20 CN CN202280033768.1A patent/CN117295855A/zh active Pending
  • 2022-05-20 WO PCT/JP2022/020957 patent/WO2022259844A1/ja not_active Ceased
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