JP2008248090A - Resin composition and filament - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a resin composition which contains a high-density polyethylene, an ethylenic polymer having high transferability of a pest-controlling agent, and the pest-controlling agent, and from which a filament is formed while reducing the frequency of the occurrence of breakage of the filament which occurs when forming the filament. <P>SOLUTION: The resin composition contains the high-density polyethylene, a high-pressure low-density polyethylene, the pest-controlling agent and a carrier. The melt flow rate of the high-density polyethylene is 0.1-10 g/10 min, and the high-pressure low-density polyethylene satisfies the following requirements (a1) and (a2); (a1): having 5-50 g/10 min melt flow rate (MFR); and (a2): having 1-12 wt.% proportion of components having ≥1,000,000 molecular weight. The contents of the high-pressure low-density polyethylene, the pest-controlling agent and the carrier are 1-15 pts.wt., 0.1-10 pts.wt. and 0.1-20 pts.wt. respectively based on 100 pts.wt. of the high-density polyethylene. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a resin composition containing a high-density polyethylene, a high-pressure method low-density polyethylene, a pest control agent and a carrier, and a filament comprising the resin composition.

  A resin composition obtained by blending a polyethylene-based resin with a pest control agent is processed into various molded products and used as a material for controlling pests such as mites, lice, mosquitoes and flies. For example, Patent Document 1 proposes a resin composition in which a pest control agent such as low-density polyethylene or linear low-density polyethylene is blended with a highly migratory ethylene polymer and a pest control agent in high-density polyethylene. In the examples, a resin composition using a commercially available low-density polyethylene as an ethylene polymer having a low migratory pest control agent and an inflation film comprising the resin composition are described.

JP-A-8-302080

However, in the resin composition in which the low density polyethylene and the pest control agent are blended with the above high density polyethylene, the filament may be cut when the resin composition is molded into a filament. The moldability was not fully satisfactory.
Under such circumstances, the problem to be solved by the present invention is a resin composition comprising a high-density polyethylene, a pest control agent containing a highly migratory ethylene polymer and a pest control agent, and the resin composition An object of the present invention is to provide a resin composition in which the occurrence frequency of cutting of a filament generated when an article is formed into a filament is reduced, and a filament made of the resin composition.

That is, the first of the present invention is a resin composition containing a high-density polyethylene, a high-pressure method low-density polyethylene, a pest control agent and a carrier, and the melt flow rate (MFR) of the high-density polyethylene is 0.1 to 0.1. 10 g / 10 min, the high pressure method low density polyethylene satisfies the following requirements (a1) and (a2), and the content of the high pressure method low density polyethylene is 1 to 15 parts by weight per 100 parts by weight of the high density polyethylene The content of the pest control agent is 0.1 to 10 parts by weight and the content of the carrier is 0.1 to 20 parts by weight.
(A1) Melt flow rate (MFR) is 5 to 50 g / 10 min (a2) The proportion of components having a molecular weight of 1 million or more is 1 to 12% by weight

  The second of the present invention relates to a filament made of the above resin composition.

  According to the present invention, a high-density polyethylene and a pest control agent are a resin composition containing a highly migratory ethylene polymer and a pest control agent, and the filament cutting that occurs when the resin composition is molded into a filament It is possible to provide a resin composition having a reduced occurrence frequency of and a filament comprising the resin composition.

  The high-density polyethylene used in the present invention is an ethylene homopolymer or a copolymer of ethylene and an α-olefin having 3 to 20 carbon atoms (ethylene-α-olefin copolymer). Examples of the α-olefin include propylene, 1-butene, 1-pentene, 1-hexene, 1-heptene, 1-octene, 1-nonene, 1-decene, 1-dodecene, 4-methyl-1-pentene, 4 -Methyl-1-hexene and the like can be mentioned, and these may be used alone or in combination of two or more.

  The content of the monomer unit based on ethylene in the high-density polyethylene is usually 90% by weight or more, where the total weight of the high-density polyethylene is 100% by weight.

  As high density polyethylene, ethylene homopolymer, ethylene-propylene copolymer, ethylene-1-butene copolymer, ethylene-1-hexene copolymer, ethylene-1-octene copolymer, ethylene-1-butene -1-hexene copolymer and the like, preferably a copolymer of ethylene and an α-olefin having 4 to 8 carbon atoms, more preferably an ethylene-propylene copolymer, ethylene-1- A butene copolymer, an ethylene-1-hexene copolymer, an ethylene-1-octene copolymer, and an ethylene-1-butene-1-hexene copolymer, more preferably an ethylene-propylene copolymer, an ethylene- 1-butene copolymer, ethylene-1-hexene copolymer, and ethylene-1-octene copolymer.

  The melt flow rate (MFR) of the high density polyethylene is 0.1 to 10 g / 10 min. If the MFR is too high, the frequency of filament breakage may increase. The MFR is preferably 6 g / 10 min or less, more preferably 4 g / 10 min or less, and still more preferably 2 g / 10 min or less. Further, the MFR is preferably 0.3 g / 10 min or more, more preferably 0.6 g / 10 min or more, from the viewpoint of reducing the motor load of the extruder during filament forming. The MFR is measured under the conditions of a load of 21.18 N and a temperature of 190 ° C. in the method defined in JIS K7210-1995.

  The melt flow rate ratio (MFRR) of the high-density polyethylene is preferably 50 or less, more preferably 45 or less, and still more preferably 40 or less, from the viewpoint of increasing the strength of the filament. Moreover, from a viewpoint of reducing the motor load of the extruder at the time of filament shaping | molding, Preferably it is 10 or more, More preferably, it is 15 or more, More preferably, it is 20 or more. The MFRR is obtained by measuring the melt flow rate (MFR-H, unit: g / 10 minutes) measured under the conditions of a test load of 211.83 N and a measurement temperature of 190 ° C. according to JIS K7210-1995, in accordance with JIS K7210. -In the method specified in 1995, this is a value divided by the melt flow rate (MFR) measured under the conditions of a load of 21.18 N and a temperature of 190 ° C.

The density of the high density polyethylene is usually 940 to 965 kg / m ³ . The density is preferably 945 kg / m ³ or more from the viewpoint of enhancing the pest control property of the filament. The density is preferably 960 kg / m ³ or less, more preferably 955 kg / m ³ or less, from the viewpoint of further reducing the occurrence frequency of filament cutting. In addition, this density is measured in accordance with the method prescribed | regulated to A method among JISK7112-1980 using the test piece which annealed as described in JISK6760-1995.

  As a method for producing high-density polyethylene, known olefin polymerization catalysts such as Ziegler-Natta catalysts, chromium catalysts, metallocene catalysts, solution polymerization methods, slurry polymerization methods, gas phase polymerization methods, high pressure ion polymerization methods are used. And the like, and a production method by a known polymerization method. The polymerization method may be either a batch polymerization method or a continuous polymerization method, and may be a multistage polymerization method having two or more stages.

Examples of the Ziegler-Natta catalyst include the following catalyst (1) or (2).
(1) A catalyst comprising a component in which at least one selected from the group consisting of titanium trichloride, vanadium trichloride, titanium tetrachloride, and a halo alcoholate of titanium is supported on a magnesium compound and an organometallic compound as a cocatalyst ( 2) A catalyst comprising an organometallic compound which is a coprecipitate of a magnesium compound and a titanium compound or a eutectic and a cocatalyst.

  Examples of the chromium catalyst include a catalyst composed of a component in which a chromium compound is supported on silica or silica-alumina, and an organometallic compound as a cocatalyst.

Examples of the metallocene catalyst include the following catalysts (1) to (4).
(1) A catalyst comprising a transition metal compound having a group having a cyclopentadiene-type skeleton and a component containing an alumoxane compound. (2) A component containing the transition metal compound and ionic properties such as trityl borate and anilinium borate. catalyst comprising component containing a compound (3) said transition metal compound and component comprising a component containing an ionic compound, a catalyst (4) SiO ₂ the components of the consisting of components including an organic aluminum compound, Al ₂ Catalysts obtained by supporting or impregnating inorganic particulate compounds such as O ₃ and particulate polymers such as olefin polymers such as ethylene and styrene.

  As a manufacturing method of the high density polyethylene used in the present invention, a manufacturing method using a Ziegler-Natta catalyst or a metallocene catalyst is preferable. Further, from the viewpoint of improving melt spinnability, those having a narrow residence time distribution during polymerization are preferable. In order to narrow the residence time distribution, a plurality of reaction vessels are arranged in parallel in a single-stage polymerization or a process having a plurality of reaction vessels. It is preferable that the polymer is run and polymerized.

  The melt flow rate (MFR) of the high pressure method low density polyethylene used in the present invention is 5 to 50 g / 10 min. If the MFR is too high, the frequency of filament breakage may increase. The MFR is preferably 30 g / 10 min or less, more preferably 25 g / 10 min or less. Further, even if the MFR is too low, the frequency of occurrence of filament cutting may increase. The MFR is preferably 7 g / 10 minutes or more, more preferably 10 g / 10 minutes or more. The MFR is measured under the conditions of a load of 21.18 N and a temperature of 190 ° C. in the method defined in JIS K7210-1995.

The density of the high pressure method low density polyethylene is usually 910 to 935 kg / m ³ . The density is preferably 930 kg / m ³ or less, more preferably 925 kg / m ³ or less, from the viewpoint of enhancing the pest control property. The density is preferably 915 kg / m ³ or more from the viewpoint of improving the pest control property. The density is measured according to a method defined in Method A of JIS K7112-1980 using a test piece subjected to annealing described in JIS K6760-1995.

  The component ratio of the high-pressure low-density polyethylene having a molecular weight of 1 million or more is 1 to 12% by weight. If the component ratio is too small, the frequency of filament breakage may increase. The component ratio is preferably 2% by weight or more, more preferably 6% by weight or more. Further, if the component ratio is too large, the frequency of occurrence of filament cutting may increase. The component ratio is preferably 10% by weight or less, and more preferably 9% by weight or less. Here, the molecular weight of 1,000,000 is a molecular weight in terms of polystyrene. The component ratio can be determined from a molecular weight distribution curve in terms of polystyrene obtained by gel permeation chromatography.

  High pressure method As a method for producing low density polyethylene, a method of polymerizing ethylene with a radical generator under high temperature and high pressure is used.

  Examples of radical generators include di-t-butyl peroxide, t-butyl hydroperoxide, t-butyl-peroxy-2-ethylhexanate, dicumyl peroxide, t-butyl peroxyisopropyl carbonate, and t-butyl peroxide. Examples thereof include organic peroxides such as oxybenzoate, di-t-amyl peroxide, cumyl hydroperoxide, and t-butyl peroxybivalate, and oxygen.

  From the viewpoint of increasing the proportion of components having a molecular weight of 1,000,000 or more, it is preferable to use two or more radical generators. Two or more types of radical generators may be used sequentially, or two or more types may be mixed and used. Moreover, about the introduction | transduction to a polymerization reactor, you may introduce from one place and may introduce from several places.

  In the production of the high pressure method low density polyethylene, a chain transfer agent may be used to adjust the molecular weight of the high pressure method low density polyethylene. Examples of the chain transfer agent include saturated hydrocarbons, aromatic hydrocarbons, alcohols and the like. Examples of saturated hydrocarbons include alkanes such as ethane, propane, n-butane, n-hexane, n-heptane, and isobutane, and cyclic alkanes such as cyclohexane. Aromatic hydrocarbons include benzene, toluene, xylene, ethylbenzene and the like, and alcohols include methanol, ethanol and the like. In addition, organic compounds containing hetero atoms such as tetrahydrofuran and acetone, hydrogen, and the like are also included. The chain transfer agent is preferably ethane, propylene or propane.

  As the polymerization temperature, it is preferable to increase the maximum polymerization temperature in order to increase the proportion of components having a molecular weight of 1,000,000 or more. The maximum polymerization temperature is more preferably 240 ° C. or higher, and further preferably 260 ° C. or higher. The maximum polymerization temperature is usually 310 ° C. or lower.

  As the polymerization pressure, in order to increase the proportion of components having a molecular weight of 1 million or more, it is preferable to lower the maximum polymerization pressure. The maximum polymerization pressure is more preferably 170 MPa or less, and further preferably 150 MPa or less. The maximum polymerization pressure is usually 50 MPa or more.

  Examples of the reaction vessel used in the production of the high-pressure method low density polyethylene include a tank-type reaction vessel and a tube-type reaction vessel, and a tank-type reaction vessel is preferable. The production of the high-pressure method low-density polyethylene may be carried out in a single reaction vessel or a combination of a plurality of reaction vessels. From the viewpoint of increasing the proportion of components having a molecular weight of 1 million or more, it is preferable to produce a combination of a plurality of reaction vessels.

  Examples of the pest control agent used in the present invention include compounds having pest control properties such as insecticides, insect growth control agents, and repellents.

  Examples of the insecticide include pyrethroid compounds, organophosphorus compounds, carbamate compounds, and phenylpyrazole compounds. Examples of pyrethroid compounds include permethrin, allethrin, d-arethrin, dd-arethrin, d-tetramethrin, prareslin, cyphenothrin, d-phenothrin, d-resmethrin, empentrin, fenvalerate, esfenvalerate, fenpropraslin, cyhalothrin, Cyfluthrin, etofenprox, traromesrin, esbioslin, benfluthrin, terrareslin, deltamethrin, cypermethrin, phenothrin, tefluthrin, bifenthrin, cyfluthrin, ciphenothrin, cypermethrin, alpha cypermethrin, etc. , Nared, fenthion, siaphos, chloropyrifos, diazinon, calclofos, salicio , Diazinon, etc. Examples of the carbamate compound, methoxy diazo down, propoxur, Fenobukabu, carbaryl and the like, fipronil and the like as the phenylpyrazole compound.

  Insect growth regulators include pyriproxyfen, mesoprene, hydroprene, diflubenzuron, cyromazine, phenoxy curve, lufenuron (CGA184599) and the like.

  Examples of repellents include diethyl toluamide and dibutyl phthalate.

These pest control agents can be used alone or in admixture of two or more. As the pest control agent, insecticides are preferable, pyrethroid compounds are more preferable, and pyrethroid compounds having a vapor pressure at 25 ° C. of less than 1 × 10 ⁻⁶ mmHg are more preferable. Examples of the pyrethroid compound having a vapor pressure of less than 1 × 10 ⁻⁶ mmHg at 25 ° C. include resmethrin and permethrin.

  You may mix | blend the compound which has a role which raises the effect of pest control in the resin composition of this invention. Examples of the compound include piperonyl butoxide, MGK264, octachlorodipropyl ether and the like.

  Further, as the carrier used in the resin composition of the present invention, those capable of supporting a pest control agent are used, and silica compounds, zeolites, viscous minerals, metal oxides, mica, hydrotalcites, organic Examples thereof include carriers. Silica compounds include amorphous silica and crystalline silica, and examples thereof include powdered silicic acid, finely powdered silicic acid, acid clay, diatomaceous earth, quartz, and white carbon. Examples of zeolites include A-type zeolite and mordenite, and examples of viscous minerals include montmorillonite, saponite, beidellite, bentonite, kaolinite, halloysite, nacrite, decait, anoxite, illite, and sericite. Examples of metal oxides include zinc oxide, magnesium oxide, aluminum oxide, iron oxide, copper oxide, and titanium oxide. Examples of mica include mica and permiculite. Examples of hydrotalcites include hydrotalcite. Sites, smectites, etc., and organic carriers include charcoal (charcoal, peat, grass charcoal, etc.), polymer beads (microcrystalline cellulose, polystyrene beads, acrylate beads, methacrylate esters, polyvinyl alcohol beads) etc) And their cross-linked polymer beads and the like. Other examples include pearlite, gypsum, ceramics, and volcanic rocks.

  As the carrier, an amorphous inorganic compound is preferable, and amorphous silica is more preferable.

  The resin composition of the present invention is a resin composition containing high-density polyethylene, high-pressure low-density polyethylene, a pest control agent, and a carrier.

  The content of the high pressure method low density polyethylene is 1 to 15 parts by weight per 100 parts by weight of the high density polyethylene. If the content is too small, pest control properties may be reduced. The content is preferably 1 part by weight or more, more preferably 3 parts by weight or more. Also, if the content is too large, the pest control property may be lowered. The content is preferably 10 parts by weight or less.

  The content of the pest control agent is 0.1 to 10 parts by weight per 100 parts by weight of high density polyethylene. If the content is too small, pest control properties may be reduced. The content is preferably 0.5 parts by weight or more, more preferably 1 part by weight or more. Further, the content is preferably 5 parts by weight or less, more preferably 3 parts by weight or less, from the viewpoint of reducing the stickiness of the filament.

  The content of the carrier is 0.1 to 20 parts by weight per 100 parts by weight of high density polyethylene. If the content is too small, pest control properties may be reduced. The content is preferably 0.5 parts by weight or more, more preferably 1 part by weight or more. Further, the content is preferably 10 parts by weight or less, more preferably 5 parts by weight or less, from the viewpoint of increasing the strength of the filament.

  If necessary, the resin composition of the present invention may contain additives such as antioxidants, antiblocking agents, fillers, lubricants, antistatic agents, weathering stabilizers, pigments, processability improvers, and metal soaps. Two or more of these additives may be used in combination.

  As the antioxidant, a phenol-based antioxidant, a phosphorus-based antioxidant, a sulfur-based antioxidant, or the like is used.

  Examples of phenolic antioxidants include 2,6-di-t-butyl-4-methylphenol (BHT) and n-octadecyl-3- (3,5-di-t-butyl-4-hydroxyphenyl). Propionate (trade name Irganox 1076, manufactured by Ciba Specialty Chemicals), pentaerythrityl-tetrakis [3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate] (trade name Irganox 1010, manufactured by Ciba Specialty Chemicals) 1,3,5-tris (3,5-di-tert-butyl-4-hydroxybenzyl) isocyanurate (trade name Irganox 3114, manufactured by Ciba Specialty Chemicals), 1,3,5-trimethyl-2,4, 6-Tris (3,5-di-tert-butyl-4-hydroxybenzine ) Benzene, 3,9-bis [2- {3- (3-t-butyl-4-hydroxy-5-methylphenyl) propionyloxy} -1,1-dimethylethyl] -2,4,8,10- And tetraoxaspiro [5,5] undecane (trade name Sumilizer GA80, manufactured by Sumitomo Chemical Co., Ltd.).

  Examples of phosphorus antioxidants include distearyl pentaerythritol diphosphite (trade name ADK STAB PEP8), tris (2,4-di-tert-butylphenyl) phosphite (trade name Irgafos 168, manufactured by Ciba Specialty Chemicals). Bis (2,4-di-tert-butylphenyl) pentaerythritol diphosphite, tetrakis (2,4-di-tert-butylphenyl) 4,4′-biphenylenediphosphonite (trade name Sandostab P-EPQ , Manufactured by Clariant Shapin Co., Ltd.), bis (2-t-butyl-4-methylphenyl) pentaerythritol diphosphite, and the like.

  Examples of the antioxidant having both a phenol structure and a phosphorus structure include 6- [3- (3-tert-butyl-4-hydroxy-5-methyl) propoxy] -2,4,8,10 tetra-tert-butyldibenz. [D, f] [1, 3, 2] -Dioxaphosphabin (trade name Sumilizer GP, manufactured by Sumitomo Chemical Co., Ltd.) and the like.

  Examples of the sulfur-based antioxidant include 4,4′-thiobis (3-methyl-6-tert-butylphenol) (trade name Sumilizer WXR, manufactured by Sumitomo Chemical Co., Ltd.), 2,2-thiobis- (4-methyl- 6-tert-butylphenol) (trade name IRGANOX 1081, manufactured by Ciba Specialty Chemical Co., Ltd.).

  Examples of other antioxidants include vitamin E and vitamin A.

  The antioxidant is preferably an antioxidant having a phenol structure, more preferably a phenolic antioxidant, and still more preferably 2,6-di-t-butyl-4-methylphenol, for example. (BHT), n-octadecyl-3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate, pentaerythrityl-tetrakis [3- (3,5-di-t-butyl-4-hydroxy Phenyl) propionate].

  From the viewpoint of improving the stability of the pest control agent and reducing the occurrence frequency of filament breakage, it is preferable to use an antioxidant. The content of the antioxidant is preferably 0.01 parts by weight or more, more preferably 0.03 parts by weight or more, further preferably 0.05 parts by weight or more, per 100 parts by weight of the high-density polyethylene. . Further, the content is preferably 1 part by weight or less, more preferably 0.5 part by weight or less, and further preferably 0.2 part by weight or less, from the viewpoint of reducing filament coloring.

  The resin composition of the present invention is produced by melt-kneading high-density polyethylene, high-pressure low-density polyethylene, pest control agent, and carrier with a known kneading apparatus such as an extruder, a roll molding machine, and a kneader. Is done. In the production of the resin composition, a pest control agent may be previously supported on a carrier before melt-kneading, and the pest control agent and the carrier are a high-pressure method low-density polyethylene or a master batch using high-density polyethylene as a base resin. May be subjected to melt kneading. As a specific example, a pest control agent and a carrier are mixed, and the carrier is loaded with the pest control agent, and then the carrier carrying the pest control agent and the high-pressure low-density polyethylene are melt-kneaded to prepare a master batch. And a method of melt-kneading the master batch and high-density polyethylene.

  The resin composition of the present invention is suitably used for forming a filament because the occurrence frequency of filament cutting that occurs when forming into a filament is low.

  As a method for forming the resin composition of the present invention into a monofilament, for example, the resin composition is melted and extruded from a die / nozzle by melting the resin composition using an extruder or the like and passing through a gear pump. The material is taken into a strand shape, and the strand-shaped resin composition is cooled using a cooling medium such as water or air to perform spinning, and thereafter, as necessary, such as heat stretching, heat treatment, oil coating, etc. A method of performing the treatment and winding can be given.

  Examples of the cross-sectional shape of the filament include a circle, an ellipse, a triangle, a quadrangle, a hexagon, and a star.

  Examples of the use of the monofilament made of the resin composition of the present invention include nets and nets such as mosquito nets, screen doors, and insect nets; ropes; threads; filters and the like. Applications of multifilaments include ropes; nets; Nonwoven fabrics; filters; shoes; clothing and the like. In particular, applications that require pest control, such as mosquito nets, screen doors, insect nets, filters, carpets, shoes, and clothing are suitable.

  Examples of insects that are targets for controlling filaments comprising the resin composition of the present invention include arthropods such as spiders, mites, and insects. Further examples will be described as follows. Examples of the staghorn rope include acarid mites (Acarina), citrus mite, mite mite, etc .; a spider (Araneae), a yellow spider, and the like. Examples of labrums include gejis belonging to the order of Scutigeromorpha; yssun centipedes belonging to the order of Lithobiomorpha. In the double leg class, for example, the zelkova and red scallops belonging to the Polydesmoidea are listed.

  Examples of insects include the following. Yamatoshimi, etc. belonging to Thysanura; Camellia, Kera, Enma cricket, Tosamabata, Sabakubi-batta, locust, etc. belonging to Orthoptera; Scissors, etc., belonging to Dermaptera; , Black cockroaches, cockroaches, cockroaches, etc.; Yamato termites, termites, termites, etc.; Ants that belong to the order of Psocoptera, etc.; Cat lice, etc .; body lice, pheasants, and human lice belonging to the order of Anoplura; leafhoppers, leafhoppers, leafhoppers, aphids, leafworms belonging to the order of Hemiptera Mi, Kusagi beetle, etc .; Coleoptera, cutworm beetle, cucumber weevil, weevil, flathead beetle, Nagaryo hornworm, beetle, etc .; Akaieka, Aedes aegypti, Anopheles, Buyu, Sesuji Rika, Butterfly flies, House flies, Flies flies, Tsetse flies, Cows, Flies, etc .; Hornets (Hymenoptera)

Hereinafter, the present invention will be described with reference to examples and comparative examples.
The physical properties in Examples and Comparative Examples were measured according to the following methods.

(1) Melt flow rate (MFR, unit: g / 10 minutes)
In the method defined in JIS K7210-1995, the measurement was performed under the conditions of a load of 21.18 N and a temperature of 190 ° C.

(2) Melt flow rate ratio (MFRR)
In the method specified in JIS K7210-1995, the melt flow rate (MFR-H, unit: g / 10 minutes) measured under conditions of a test load of 211.83 N and a measurement temperature of 190 ° C. is specified in JIS K7210-1995. In this method, the value divided by the melt flow rate (MFR) measured under the conditions of a load of 21.18 N and a temperature of 190 ° C. was defined as MFRR.

(3) Density (Unit: kg / m ³ )
It measured according to the method prescribed | regulated to A method among JISK7112-1980. The measurement sample piece was annealed according to JIS K6760-1995 and used for measurement.

(4) Component ratio (unit: wt%) with a molecular weight of 1 million or more
Using a gel permeation chromatograph (GPC) method, a molecular weight distribution curve was measured under the following conditions (1) to (8). Next, in the molecular weight distribution curve, the area ratio of a region having a molecular weight of 1 million or more in terms of polystyrene was determined.
(1) Equipment: Waters 150C manufactured by Water
(2) Separation column: TOSOH TSKgelGMH-HT
(3) Measurement temperature: 145 ° C
(4) Carrier: Orthodichlorobenzene
(5) Flow rate: 1.0 mL / min
(6) Injection volume: 500 μL
(7) Detector: Differential refraction
(8) Molecular weight reference material: Standard polystyrene
(TSK STANDARD POLYSTYRNE made by Tosoh)

Example 1
(1) Adjustment of resin composition Antioxidant (2,6-di-t-butyl-4-methylphenol) (hereinafter referred to as BHT) is added to 51 parts by weight of permethrin (trade name Exmine, manufactured by Sumitomo Chemical Co., Ltd.). 1.5 parts by weight were dissolved. Next, 52.5 parts by weight of permethrin containing BHT and 47.5 parts by weight of amorphous silica (trade name porous silica manufactured by Suzuki Yushi) were mixed with stirring to prepare a carrier carrying a pest control agent. . High-pressure low-density polyethylene (Sumitomo Chemical Sumikacene CE4506) (hereinafter referred to as LD-1) pellets 59.42 parts by weight, BHT 0.06 parts by weight, and a carrier carrying a pest control agent 31 parts by weight Then, 5 parts by weight of zinc stearate and 4.52 parts by weight of a blue color material (manufactured by Sumika Color Co., Ltd.) were melt-kneaded at a set temperature of 200 ° C. using a twin-screw extruder, Created. Next, 100 parts by weight of pellets of high-density polyethylene (manufactured by Prime Polymer, trade name: Hi-Zex 5000S; MFR = 0.8 g / 10 min, density = 948 kg / m ³ , MFRR = 35) and 16.5 parts by weight of a master batch 7.0 parts by weight of zinc stearate was melt kneaded at a set temperature of 260 ° C. using a single screw extruder to obtain a resin composition. The results of measuring physical properties of the LD-1 pellets are shown in Table 1.

(2) Manufacture of filaments The obtained resin composition was extruded at a discharge rate of 0.7 kg / hr and a die set temperature of 220 ° C. using a 35 mmφ extruder with a 1 mmφ-6 hole die, and a line speed of 14 m / min. It was taken out and passed through a heated water bath at 112 m / min and formed into a 170 denier monofilament. The filament cutting frequency during molding was one per hour.

Example 2
(1) Preparation of Resin Composition High Pressure Low Density Polyethylene Same as Example 1 except that Sumitomo Chemical's Sumikasen G801 (hereinafter referred to as LD-2) pellets were used instead of pellets of high density low density polyethylene LD-1. The resin composition was adjusted. The physical property measurement results of the LD-2 pellets are shown in Table 1.

(2) Manufacture of a filament The obtained resin composition was shape | molded to the monofilament similarly to manufacture of the filament of Example 1. FIG. The filament cutting frequency during molding was 0 per hour.

Comparative Example 1
(1) Preparation of Resin Composition High Pressure Method Low Density Polyethylene Same as Example 1 except that Sumitomo Chemical's Sumikasen CE5502 (hereinafter referred to as LD-3) pellets were used instead of pellets of LD-1. The resin composition was adjusted. The physical property measurement results of the LD-3 pellets are shown in Table 1.

(2) Manufacture of a filament The obtained resin composition was shape | molded to the monofilament similarly to manufacture of the filament of Example 1. FIG. The cutting frequency of the filament during molding was 3 per hour.

Comparative Example 2
(1) Preparation of Resin Composition High Pressure Method Low Density Polyethylene Same as Example 1 except that Sumitomo Chemical's Sumikasen CE5503 (hereinafter referred to as LD-4) pellets were used instead of pellets of LD-1. The resin composition was adjusted. Table 1 shows the physical property measurement results of the LD-4 pellets.

(2) Manufacture of a filament The obtained resin composition was shape | molded to the monofilament similarly to manufacture of the filament of Example 1. FIG. The filament cutting frequency during molding was 5 per hour.

Claims (2)

A high-density polyethylene, a high-pressure method, a low-density polyethylene, a pest-controlling agent, and a resin composition, wherein the high-density polyethylene has a melt flow rate (MFR) of 0.1 to 10 g / 10 min. The low-density polyethylene satisfies the following requirements (a1) and (a2), the content of the high-pressure method low-density polyethylene is 1 to 10 parts by weight per 100 parts by weight of the high-density polyethylene, and the content of the pest control agent is 0 A resin composition having a content of 1 to 15 parts by weight and a carrier content of 0.1 to 20 parts by weight.
(A1) Melt flow rate (MFR) is 5 to 50 g / 10 min (a2) The proportion of components having a molecular weight of 1 million or more is 1 to 12% by weight   A filament comprising the resin composition according to claim 1.