Resin composition and method for producing the same

Abstract

To obtain a novel resin composition having moldability, shape retainability and recyclability.SOLUTION: There is provided a resin composition comprising at least two mutually immiscible thermoplastic resins, wherein one of the thermoplastic resins is a resin having a largest volume fraction among the resin compositions and the viscosity ratio (1) and (2) indicated below for the largest volume fraction resin in a molten state is 2 or more. Viscosity ratio (1)=Complex viscosity at angular frequency 20 rad / s / Complex viscosity at angular frequency 200 rad / s, Viscosity ratio (2)=Complex viscosity at angular frequency 2 rad / s / Complex viscosity at angular frequency 20 rad / s.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a resin composition and a method for producing the same. [Background technology]

[0002] Resin materials have been widely used as materials for various molded articles, fibers, films, porous bodies, etc. Resin materials must be easy to mold and process, and must also have high dimensional stability after processing and shape retention during use. Therefore, there is a demand for resin compositions that exhibit low viscosity at high shear rates and high viscosity at low shear rates.

[0003] Therefore, a method of mixing various fillers into resins is known. Specifically, in consideration of suppressing embrittlement while improving elastic modulus and imparting transparency, fine inorganic particles, carbon nanofibers, carbon nanotubes, cellulose nanofibers, etc. are mixed as the fillers (see, for example, Patent Documents 1 to 3). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Special Publication No. 2017-503057 [Patent Document 2] Japanese Patent Application Laid-Open No. 2009-19088 [Patent Document 3] Japanese Patent Application Laid-Open No. 2010-116477 Summary of the Invention [Problem to be solved by the invention]

[0005] However, inorganic particles and various nanofibers are difficult to manufacture and handle. Furthermore, they are difficult to disperse and mix into resins, requiring surface treatment or the use of dispersants such as surfactants, which can affect the resin's properties, such as moisture absorption, rigidity, and conductivity. Furthermore, resin materials containing inorganic particles or nanofibers pose recycling challenges. Thus, there is a demand for novel resin compositions that have low viscosity at high shear rates and high viscosity at low shear rates, and are also easy to recycle. [Means for solving the problem]

[0006] As a result of extensive research, the present inventors have found that the above-mentioned problems can be solved by adopting the following configuration, and have arrived at the present invention.

[0007] 1. A resin composition comprising at least two mutually incompatible thermoplastic resins, one of which has the largest volume fraction in the resin composition, and in which the viscosity ratio (1) and (2) of the resin with the largest volume fraction in a molten state is 2 or greater, as shown below. Viscosity ratio (1) = complex viscosity at an angular frequency of 20 rad / s ÷ complex viscosity at an angular frequency of 200 rad / s Viscosity ratio (2) = complex viscosity at angular frequency 2 rad / s ÷ complex viscosity at angular frequency 20 rad / s 2. The resin composition according to item 1 above, wherein the viscosity ratio (2) is greater than the viscosity ratio (1). 3. A resin molded article which has been reprocessed at a temperature equal to or higher than the melting point of at least one thermoplastic resin contained in the resin composition according to 1 or 2 above. 4. A fibrous material formed using the resin composition of 1 or 2 above. 5. A method for producing a fibrous material as described in claim 4, characterized in that it includes an extrusion process in which the thermoplastic resins are melted and mixed at a temperature above the melting point of the resin with the lowest melting point and extruded from a nozzle, and a stretching process in which the resin is stretched using an air flow. [Effects of the Invention]

[0008] According to the present invention, a resin composition can be obtained that has a low viscosity at high shear rates and a high viscosity at low shear rates without adding inorganic fillers or nanofibers. Furthermore, the viscosity can be reduced and the amount of thermal decomposition residue can be reduced during recycling. DETAILED DESCRIPTION OF THE INVENTION

[0009] Specific examples of the present invention are given below, but the present invention is not limited to the following, and an optimum configuration can be selected for each application in accordance with the spirit of the present invention.

[0010] The resin composition of the present invention contains at least two mutually incompatible thermoplastic resins. The resins that are preferably used are not particularly limited as long as they have the desired properties, but preferred thermoplastic resins include polyester, polyamide, polyolefin, polyvinyl alcohol, polyethylene glycol, polyether, polyetherimide, polyether ketone, polyacetal, polycarbonate, polysulfone, and polyphenylene sulfide. Examples of polyolefins include polyethylene, polypropylene, polybutene, cyclic olefin, polymethylpentene, polystyrene, polyvinyl chloride, polyvinylidene fluoride, ethylene tetrafluoroethylene, and their copolymer-modified resins.

[0011] The proportion of the thermoplastic resin in the resin composition of the present invention is 50% by mass or more, more preferably 80% by mass or more, even more preferably 90% by mass or more, and most preferably 95% by mass or more, because this facilitates processability and handling when melted.

[0012] Furthermore, at least one pair of thermoplastic resins used in the present invention are incompatible with each other. By using thermoplastic resins that are incompatible with each other, the resin composition of the present invention can be obtained.

[0013] With regard to the thermoplastic resins used in the present invention, it is preferable that at least one of them is a crystalline resin having a melting point. Furthermore, if two types are used, the resin with the smallest volume fraction is preferably crystalline and has a high melting point, and if three or more types are used, it is preferable that the resin with the lowest volume fraction is crystalline and has a high melting point. In consideration of ease of handling in practical use, the thermoplastic resin used in the present invention preferably has a melting point in the range of 40°C to 400°C, more preferably in the range of 60°C to 350°C, even more preferably in the range of 80°C to 300°C, and most preferably in the range of 100°C to 280°C. If the melting point is too low, handling in practical use becomes difficult, and if it is too high, it is disadvantageous in terms of energy consumption and thermal degradation of the resin.

[0014] In the present invention, it is also preferable to use two or more polyolefins from the viewpoint of processability and handling. A resin composition with excellent hydrophobicity and low moisture absorption can be obtained. For example, polypropylene, polyethylene, polystyrene, polymethylpentene, cyclic olefins, various halides, copolymer resins, etc. can be used in combination. It is also preferable that these have branched chains or side chains. Polyolefins leave little carbonized residue during pyrolysis and are easily pyrolyzed, resulting in excellent recyclability.

[0015] The polyolefin particularly preferably used in the present invention is selected from polypropylene, polyethylene, and polymethylpentene, and resins which are incompatible with each other can be selected and used.

[0016] When polypropylene is used in the present invention, the stereoregularity is preferably 85% or more, more preferably 90% or more, even more preferably 90% or more, and most preferably 95% or more. In this case, either isotactic or syndiotactic polypropylene can be preferably used. Two or more types of polypropylene may be used.

[0017] In the present invention, it is possible to use polypropylene having a melt viscosity suitable for the required fiber diameter and strength / elongation properties, and a specific example of an MFR value according to JIS K 7210 at 230°C is 1 to 3000. More preferably, it is 200 to 1800, even more preferably 500 to 1500, and most preferably 700 to 1300. In the present invention, a resin having any viscosity property can be selected and mixed depending on the properties of the polypropylene.

[0018] When polyethylene is used in the present invention, high density polyethylene, low density polyethylene, linear low density polyethylene, or copolymer resins thereof can be used.

[0019] When polymethylpentene is used in the present invention, it is also preferable that it contains a copolymer component consisting of ethylene and an α-olefin having 3 to 20 carbon atoms. This is because it improves the brittleness of polymethylpentene, maintains melt tension, and contributes to mixed spinning with polypropylene. In the present invention, it is preferable that it is incompatible with polypropylene when mixed.

[0020] The present invention is characterized by mixing two or more mutually incompatible resins. It is also preferable to add a third resin that has affinity with both of the two resins used. This can improve dispersibility and stretchability while reducing brittleness.

[0021] In the present invention, it is also preferable to add various stabilizers as additives, and it is also preferable to include hindered amine compounds, various hindered phenol stabilizers, sulfur-based stabilizers, phosphorus-based stabilizers, amine-based metal deactivators, fatty acids, fatty acid metal salts, solid and soluble crystal nucleating agents, amide-based additives, etc. This is because it contributes to maintaining properties during processing and use.

[0022] The hindered amine compound is not particularly limited, but is more preferably a polymer. For example, poly[{6-(1,1,3,3-tetramethylbutyl)amino-1,3,5-triazine-2,4-diyl}{(2,2,6,6-tetramethyl-4-piperidyl)imino}hexamethylene{2,2,6,6-tetramethyl-4-piperidyl)imino}] (Chimassorb (registered trademark) 944LD, manufactured by BASF Japan Ltd.), polycondensate of dibutylamine 1,3,5-triazine·N,N-bis(2,2,6,6-tetramethyl-4-piperidyl-1,6-hexamethylenediamine·N-(2,2,6,6-tetramethyl-4-piperidyl)butylamine (Chimassorb (registered trademark) 2020FDL, manufactured by BASF Japan Ltd.), SABO Examples include STAB (registered trademark) UV119 manufactured by SABO. Among them, Chimassorb (registered trademark) 944LD or Chimassorb (registered trademark) 2020FD, which contain a 2,2,6,6-tetramethylpiperidine structure and a triazine structure, are preferred. One type of hindered amine compound may be used alone, or two or more types may be used in combination.

[0023] - The hindered phenol stabilizer is not particularly limited, but specific examples thereof include pentaerythrityl-tetrakis[3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate] (manufactured by BASF, Irganox (registered trademark) 1010), octadecyl-3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate (manufactured by BASF, Irganox (registered trademark) 1076), tris-(3 ,5-di-t-butyl-4-hydroxybenzyl)-isocyanurate (manufactured by BASF, Irganox (registered trademark) 3114), 3,9-bis-{2-[3-(3-t-butyl-4-hydroxy-5-methylphenyl)-propionyloxy]-1,1-dimethylethyl}-2,4,8,10-tetraoxaspiro-[5,5]undecane (manufactured by Sumitomo Chemical Co., Ltd., Sumilizer (registered trademark) GA-80), and the like.

[0024] The sulfur-based stabilizer is not particularly limited, but specific examples include di-lauryl-3,3-thiodipropionate (DLTDP), dis-stearyl-3,3-thiodipropionate (DSTDP), and the like.

[0025] The phosphorus-based stabilizer is not particularly limited, but specific examples include tris(2,4-di-t-butylphenyl)phosphite (Irgafos (registered trademark) 168, manufactured by BASF), di(2,6-di-t-butyl-4-methylphenyl)-pentaerythritol-diphosphite (PEP-36, manufactured by ADEKA Corporation), and the like.

[0026] The fatty acid metal salt is not particularly limited, but is preferably one having a linear fatty acid group. The fatty acid group preferably has 10 to 20 carbon atoms. Specific examples include aluminum laurate, aluminum myristate, aluminum palmitate, aluminum stearate, magnesium laurate, magnesium myristate, magnesium palmitate, and magnesium stearate.

[0027] The nucleating agent is not particularly limited, but examples thereof include sodium bis(4-t-butylphenyl)phosphate (NA-10, manufactured by Adeka Corporation), sodium 2,2'-methylenebis(4,6-di-t-butylphenyl)phosphate (NA-11, manufactured by Adeka Corporation), the rosin-based nucleating agent Pine Crystal (registered trademark) KM-1500 (manufactured by Arakawa Chemical Co., Ltd.), sorbitol-based nucleating agents (Gelall (registered trademark) D, Gelall (registered trademark) MD, Gelall (registered trademark) DXR, manufactured by New Japan Chemical Co., Ltd.), and trisamide-based nucleating agents (XT386, manufactured by BASF Japan Ltd.), which are preferably used at their melting point or dissolved in the resin and pass through the nozzle. This is because a synergistic effect can be expected when the goal is to improve rigidity and heat resistance.

[0028] In the method for producing the resin composition of the present invention, in order to obtain the desired properties, the resin composition is extruded through a nozzle at a temperature equal to or higher than the melting point of the thermoplastic resin contained in the resin composition (extrusion step), and then stretched and oriented (stretching step), preferably by stretching with an air stream. By stretching, a fibrous material can be obtained.

[0029] In the resin composition of the present invention, at least one set of two or more thermoplastic resins is phase-separated from each other. Such resins are blended in advance, either during polymerization or as a solution, emulsion, or solid, and then heated to a temperature at which the resins flow and melted, and then extruded through a nozzle. While there are no particular limitations as long as the properties of the present invention are obtained, it is preferable that the two resins flow simultaneously when passing through the nozzle, and that at least one resin is dispersed within the nozzle diameter. More preferably, the average diameter of the dispersed resin is half or less, more preferably one-fifth or less, and even more preferably one-tenth or less of the nozzle diameter. While there are no particular limitations on the lower limit, effective conditions can be set depending on the stretching ratio of the entire resin or the dispersed resin, and the processing conditions.

[0030] When at least two types of resins are blended in solid form and then melt-mixed, the size of the solid resins may be any combination of lumps, pellets, powder, nanoparticles, etc. It is also preferable to mix one of the solid components with a dispersion such as a solution or emulsion to form a melt.

[0031] Various methods are used to melt and mix the resin before the nozzle, and these methods can be used alone or in combination, such as a method of simply heating a pipe or container, a method using a heated single-screw or twin-screw extruder, or a method using a heated roller. The mechanism for extruding the resin from the nozzle is not particularly limited, but by applying pressure to the resin using a piston or screw extruder, a desired shear force can be applied as the resin passes through the nozzle.

[0032] The nozzle used for extrusion can have a variety of shapes, but the equivalent circle diameter is preferably 0.01 to 10 mm, more preferably 0.05 to 5 mm, even more preferably 0.075 to 1 mm, and most preferably 0.1 to 0.5 mm. The ratio of hole diameter to hole depth (depth / hole diameter) is preferably 1 to 200, more preferably 3 to 100, even more preferably 5 to 40, and most preferably 7 to 20. Specifically, a nozzle with a hole diameter of 0.1 to 0.5 mm and a hole diameter to hole depth ratio of 7 to 20 is particularly suitable for production. This is because extensional flow and relaxation proceed within the nozzle, while extrusion pressure, shear rate, and discharge rate can be simultaneously achieved. These values ​​are selected appropriately based on the viscosity and the properties of the polypropylene and second resin component.

[0033] In the present invention, the draw ratio after the nozzle outlet is preferably 10 or more, more preferably 100 or more, and most preferably 1000 or more. The draw ratio in the present invention is a value conveniently calculated by dividing the nozzle hole cross-sectional area by the average fiber cross-sectional area. In the present invention, the viscosity ratio of each resin component, the drawing speed, and the temperature conditions can be appropriately selected to achieve the above.

[0034] In the present invention, the film is subjected to preliminary shearing in the nozzle and then stretched with a high-speed airflow. The shear rate when passing through the orifice of the nozzle is preferably 10 to 1,000,000 (1 / sec), more preferably 100 to 100,000 (1 / sec), and most preferably 1,000 to 10,000 (1 / sec).

[0035] In the present invention, it is more preferable to perform drawing using an air stream after the nozzle outlet. Drawing using an air stream makes it possible to achieve a speed, draw ratio, and ultimate fiber diameter that are difficult to achieve by mechanical drawing. As for the method of drawing using an air stream, any method such as a jet flow, an entrained flow, or vacuum drawing may be used, and it is also preferable to use a combination of two or more methods.

[0036] The air temperature during stretching can be set preferably depending on the properties of the resin used. Specifically, it is preferably 0 to 500° C., more preferably 50 to 450° C., and even more preferably 100 to 400° C. If the temperature is too high, thermal decomposition and breakage defects occur, and if the temperature is too low, stretching becomes difficult.

[0037] The airflow speed during stretching can be suitably set depending on the properties of the resin used and the temperature. It is preferably 0 to 1000 m / s, more preferably 50 to 700 m / s, and most preferably 100 to 500 m / s. In the case of a jet flow, it is preferable that the speed be below supersonic speed from the viewpoint of the working environment and energy consumption.

[0038] The maximum melting and nozzle temperatures can be suitably set depending on the resin composition used. Specifically, it is preferably 50 to 400°C, more preferably 100 to 370°C, and most preferably 150 to 350°C. If the temperature is too high, there is a concern that thermal decomposition or excessive energy consumption may occur, while if the temperature is too low, there is a concern that melt dispersion and heat resistance in practical use may be poor.

[0039] The fiber diameter of the fibrous material obtained by the above method can be set to a preferred value taking into consideration the nozzle hole diameter, draw ratio, and handleability, and is preferably 0.01 to 1000 μm, more preferably 0.05 to 100 μm, even more preferably 0.1 to 50 μm, particularly preferably 0.2 to 20 μm, and most preferably 0.3 to 10 μm. Fiber diameters greater than 1000 μm are difficult to collect and wind, while fibers less than 0.01 μm are difficult to handle due to scattering and adhesion. Preferred conditions are used in addition to the nozzle diameter and draw ratio described above.

[0040] In the fibrous material using the resin composition of the present invention, there is no need to mix non-thermoplastic particles and fibers, and the material is preferably stretched by airflow, which suppresses nozzle clogging and deposits at the nozzle outlet, and provides excellent processability and processability with small-diameter nozzles that have excellent stretch ratios.

[0041] In the present invention, the complex viscosity of the obtained fibrous material measured with a rotational rheometer, when the main resin component is in a molten state, is characterized in that the value obtained by dividing the value at an angular frequency of 20 rad / s by the value at 200 rad / s and the value obtained by dividing the value at an angular frequency of 2 rad / s by the value at 20 rad / s are both at least twice as large. Furthermore, in the present invention, it is more preferable that the latter value under low shear conditions is large. This is because, in ordinary resin compositions, this indicates the growth of fibrous matter in the dispersion and is expected to have a thickening effect in practical use.

[0042] As for the measurement conditions, when the resin composition contains multiple thermoplastic resins, the temperature at which the resin with the largest volume fraction flows is added by 20°C, and the resulting value is rounded up to the nearest digit. The flow temperature is the melting point for crystalline resins, and the glass transition temperature for amorphous resins. In the present invention, for example, when thiodiotactic homopolypropylene is used as the resin with the largest volume fraction, measurement is performed at 190°C. In other words, the intended measurement is that the resin with the largest volume fraction is in a molten state, while the second resin component is not in a molten state. In the case of a composition consisting of three types of thermoplastic resins, it is sufficient that at least one of the third component or the second component is in a non-molten state, and either one satisfies the numerical values ​​of the present invention.

[0043] The resin composition of the present invention may be used by molding the obtained composition itself, by remixing with other resins at or above the melting point of at least one resin contained in the composition and then used for reprocessing, or by physically crushing the composition.Furthermore, the composition may be used as a dispersion by dissolving at least one resin contained in the composition.

[0044] Since the resin composition of the present invention is mainly composed of a thermoplastic resin, it can exhibit fluidity by heating the resin composition at a temperature above the melting point of the entire resin composition after use. Furthermore, it leaves little residue even when thermally decomposed in a high-temperature atmosphere, making it highly recyclable. [Example]

[0045] The present invention will be described in more detail below with reference to examples, but the following examples do not limit the present invention, and all modifications and variations within the scope of the present invention are included within the technical scope of the present invention. First, methods for measuring each physical property will be described.

[0046] (average fiber diameter) Using a scanning microscope, multiple images were taken with a field of view of 90 μm × 90 μm, and the diameters of 50 fibers were measured without overlapping for the same fiber. The geometric mean of the obtained values ​​was determined as the average fiber diameter.

[0047] (viscosity ratio) The viscosity ratio was calculated from the complex viscosity obtained using the following apparatus under the following conditions. Apparatus: Rotational rheometer ARES-G2 (TA Instruments Japan Co., Ltd.) Geometry: Φ25mm parallel plate Angular frequency: 500~0.1rad / s Distortion rate: 10% (vibration mode) Temperature: 190℃, 250℃ Atmosphere: Nitrogen The viscosity ratio was calculated from the measurement results using the following formula. Viscosity ratio (1) = complex viscosity at an angular frequency of 20 rad / s ÷ complex viscosity at an angular frequency of 200 rad / s Viscosity ratio (2) = complex viscosity at angular frequency 2 rad / s ÷ complex viscosity at angular frequency 20 rad / s

[0048] (Residue after heating) The residue after heating was subjected to thermogravimetry. Equipment: TG-DTA equipment STA-7200 (Hitachi High-Tech Science Corporation) Heating rate: 20℃ / min Temperature: Room temperature to 550°C (air-cooled after reaching this temperature) Atmosphere: Nitrogen Sample weight: 10 mg The mass remaining rate (%) when the temperature reached 550°C under the above conditions was defined as the residue after heating.

[0049] Example 1 Ninety-five parts by mass of MFR200 polypropylene homopolymer and five parts by mass of 4-methyl-1-pentene-1-decene copolymer (DX820, manufactured by Mitsui Chemicals, Inc.) were melt-mixed in an extruder. The mixture was extruded through a circular nozzle with a diameter of 0.3 mm and an orifice length of 4.5 mm, and simultaneously stretched with a high-temperature air stream while being collected, yielding fibers with an average fiber diameter of 2.8 μm. The complex viscosity of the resulting sample was measured at 190°C under conditions where only the polypropylene was melted. The viscosity ratios (1) and (2) were 2.6 and 3.5, respectively. The viscosity ratio (2) at low angular frequencies was confirmed to be greater than the viscosity ratio (1) at high angular frequencies. The complex viscosity was measured at 250°C, and the viscosity ratio was calculated. Furthermore, after heating to 250°C, the complex viscosity was measured again after cooling to 190°C, and the viscosity ratio was calculated. The result was roughly the same viscosity ratio as that of the polypropylene homopolymer MFR200 in Reference Example 1 described later. This confirmed that the resin composition of Example 1 exhibited a unique thickening effect and that the thickening effect could be intentionally eliminated. The residue after heating was 0.1% by mass or less. Therefore, Example 1 can be easily reused by both melting and gasification.

[0050] <Example 2> 95 parts by mass of MFR200 polypropylene homopolymer, 1 part by mass of a nitrogen-containing compound (Chimassorb® 944, BASF), 0.1 part by mass of magnesium stearate, and 10 parts by mass of 4-methyl-1-pentene-1-decene copolymer (DX820, Mitsui Chemicals, Inc.) were melt-mixed in an extruder. The mixture was extruded through a circular nozzle with a diameter of 0.3 mm and an orifice length of 4.5 mm, and simultaneously stretched with a high-temperature air stream and collected to yield fibers with an average fiber diameter of 3.1 μm. The complex viscosity of the resulting sample was measured at 190°C under conditions where only the polypropylene was melted. The viscosity ratios (1) and (2) were 3.8 and 4.8, respectively. The viscosity ratio (2) at low angular frequencies was confirmed to be greater than the viscosity ratio (1) at high angular frequencies. The complex viscosity was measured at 250°C, and the viscosity ratio was calculated. Furthermore, after heating to 250°C, the complex viscosity was measured again after cooling to 190°C, and the viscosity ratio was calculated. The result was a viscosity ratio roughly equivalent to that of the polypropylene homopolymer MFR200 in Reference Example 1 described later. This confirmed that the resin composition of Example 2 had a unique thickening effect and that the thickening effect could be intentionally eliminated. The residue after heating was 0.1% by mass or less. Therefore, Example 2 can be easily reused by both melting and gasification.

[0051] <Comparative Example 1> 95 parts by mass of MFR200 polypropylene homopolymer and 5 parts by mass of zinc oxide powder with an average diameter of 0.3 μm were prepared, melted and mixed in an extruder, and extruded through a 0.3 mm diameter circular nozzle while simultaneously being stretched with a high-temperature airflow and collected, yielding fibers with an average fiber diameter of 3.3 μm. Gradually, the nozzle became clogged, and a pressure increase was observed. The complex viscosity of the obtained sample was measured at 190°C under conditions where only the polypropylene was melted. The viscosity ratios (1) and (2) were 1.4 and 1.3, respectively. In Comparative Example 1, the thickening effect was insufficient. The residue after heating was 4.6% by mass. Therefore, Comparative Example 1 is difficult to incinerate and reuse.

[0052] <Comparative Example 2> Only polypropylene homopolymer MFR200 was melt-mixed and extruded through a 0.3 mm diameter circular nozzle, while simultaneously being drawn with a high-temperature airflow and collected, to obtain fibers with an average fiber diameter of 3.1 μm. The complex viscosity of the obtained sample was measured at 190°C under conditions in which only the polypropylene was melted, and the viscosity ratios (1) and (2) were 1.5 and 1.2, respectively. In Comparative Example 2, the thickening effect was insufficient. The post-heating residue was 0.1% by mass or less. The post-heating residue was 0.1% or less. Therefore, Comparative Example 2 is easily recyclable.

[0053] <Reference example 1> The complex viscosity of only the MFR200 polypropylene homopolymer was measured at 190°C and 250°C, and the viscosity ratios (1) and (2) were calculated. The residue after heating was also measured.

[0054] <Reference example 2> The complex viscosity of 4-methyl-1-pentene-1-decene copolymer (DX820, Mitsui Chemicals, Inc.) was measured at 250°C, and the viscosity ratios (1) and (2) were calculated. The residue after heating was also measured.

[0055] The results of Examples 1 and 2, Comparative Examples 1 and 2, and Reference Examples 1 and 2 are shown in Table 1.

[0056] [Table 1]

[0057] As shown in Table 1, in the present invention, the viscosity ratio due to angular velocity is large, enabling both processability and shape retention. Furthermore, by setting the temperature at or above the melting point of the dispersed resin component, the thickening effect is eliminated, and there is little residue after heating, making it excellent for reuse and recycling. [Industrial Applicability]

[0058] The resin composition of the present invention can be used for various molded articles such as films, fibers, and porous bodies, and has excellent moldability and dimensional stability, as well as excellent rigidity, dimensional stability, reusability, and recyclability during use of the molded articles, thereby making a great contribution to industry.

Claims

1. A resin composition comprising at least two mutually incompatible thermoplastic resins, one of the thermoplastic resins is a resin having the largest volume fraction in the resin composition; A resin composition in which the viscosity ratio (1) and (2) shown below when the resin having the largest volume fraction is in a molten state is 2 or more. Viscosity ratio (1) = complex viscosity at an angular frequency of 20 rad / s ÷ complex viscosity at an angular frequency of 200 rad / s Viscosity ratio (2) = complex viscosity at an angular frequency of 2 rad / s ÷ complex viscosity at an angular frequency of 20 rad / s

2. 2. The resin composition according to claim 1, wherein the viscosity ratio (2) is greater than the viscosity ratio (1).

3. A resin molded article, which is reprocessed at a temperature equal to or higher than the melting point of at least one thermoplastic resin contained in the resin composition according to claim 1 or 2.

4. A fibrous material formed from the resin composition of claim 1 or 2.

5. an extrusion step of melting and mixing the thermoplastic resins at a temperature equal to or higher than the melting point of the resin with the lowest melting point among the thermoplastic resins and extruding the mixture through a nozzle; The method for producing a fibrous material according to claim 4, further comprising a stretching step of stretching the fibrous material using an air current.

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