Resin composition and molded article

Abstract

To provide a resin composition including a thermoplastic resin and an inorganic filler, which can easily undergo molding processing and has flexibility and a sense of massiveness, and a molded article made thereof.SOLUTION: A resin composition includes 15 to 50 pts.mass of a specific 4-methyl-1-pentene / α-olefin copolymer (A), 10 to 50 pts.mass of an inorganic filler (B), and 5 to 49 pts.mass of a thermoplastic elastomer (C) (where the total amount of 4-methyl-1-pentene / α-olefin copolymer (A), the inorganic filler (B), and thermoplastic elastomer (C) is 100 pts.mass), wherein the thermoplastic elastomer (C) is at least one selected from the group consisting of an olefinic thermoplastic elastomer (C1) and a styrenic thermoplastic elastomer (C2). Also provided is a molded article made of the resin composition.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a resin composition and a molded article, more particularly to a resin composition containing a thermoplastic resin and an inorganic filler, a molded article, and uses thereof. [Background technology]

[0002] Among thermoplastic resins, polyolefins have traditionally been widely used in everyday items. They can be mass-produced using injection molding and other methods, and have various advantages, including low specific gravity, excellent mechanical strength, gloss, colorability, chemical resistance, and recyclability. However, thin-walled molded articles can be susceptible to damage due to impact loads. For example, providing a ribbed structure in the molded article shape can provide a buffering effect against impact loads and prevent damage. However, when the shape makes it difficult to provide a ribbed structure, molding materials filled with inorganic fillers can be used to improve impact strength.

[0003] Polyolefins have also been widely used in toys. Even for thin-walled toys, molding materials filled with inorganic fillers are used to improve impact resistance, just like in everyday household goods. Such molding materials tend to be hard, and for example, young children who often handle toys can tire of playing with them because their hard feel limits the ability to change shape.

[0004] On the other hand, styrene-based thermoplastic elastomers are used in everyday items and toys because of their elasticity similar to that of rubber materials. For example, styrene-ethylene-butylene-styrene copolymer (styrene-ethylene-butene-styrene block copolymer) (SEBS) is a copolymer of hard polystyrene segments (hard segments) and soft polybutylene segments (soft segments) in a block form. deathIt has structural units similar to those mentioned above. The terminal blocks of polystyrene aggregate with each other to form structures (domains), and these polystyrene domains act as pseudo-crosslinking points, which are known to exhibit elasticity similar to that of rubber materials. However, it is also a resin with strong self-adhesive properties (tackiness), which can cause molded articles to stick to the mold during injection molding, making it difficult to mass-produce. To suppress this self-adhesive property, molding materials containing crystalline polyolefins or inorganic fillers are used. However, these molding materials tend to be unable to maintain flexibility and produce hard molded articles.

[0005] Patent Document 1 discloses synthetic paper made of a resin composition containing inorganic mineral powder and polyethylene. Furthermore, Patent Documents 2 and 3 disclose sheet molded articles made from a resin composition containing a specific inorganic filler and a polyolefin. Of these, Patent Document 2 discloses a resin composition containing equal amounts of polypropylene resin and calcium carbonate, and a sheet made from the resin composition. Patent Document 2 also discloses that polyethylene resin can be used instead of polypropylene resin. Patent Document 3 also discloses a resin composition containing a crystalline polymer, such as polypropylene resin or polyethylene resin, and an inorganic fine powder, and a sheet made from the resin composition. Patent Document 3 specifically discloses, as an example of such a resin composition, a resin composition containing a propylene homopolymer, calcium carbonate, and a small amount of magnesium stearate. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2001-071378 [Patent Document 2] Japanese Patent Application Laid-Open No. 2003-026866 [Patent Document 3] WO2018 / 092494 issue Summary of the Invention [Problem to be solved by the invention]

[0007] The loss factor is an index used to evaluate the viscoelasticity of materials such as elastomers when they deform. This loss factor is a numerical value expressed as the ratio (G" / G') of the loss modulus (G") to the storage modulus (G'), and is known as tan δ. Materials with a large tan δ tend to have a soft feel when molded into a molded product.

[0008] The resin composition of Patent Document 1 can be used as synthetic paper and has excellent foldability and tearability. However, it does not exhibit a high tan δ peak value and is a material with poor flexibility. The resin compositions of Patent Documents 2 and 3 are proposed to have good moldability despite containing a large amount of inorganic filler. It is presumed that these compositions eliminate the stickiness of the molded body surface. However, since they contain a large amount of inorganic filler, the molded body obtained is hard. Therefore, flexibility tends to be lost, and it is difficult to achieve a high tan δ peak value in the first place.

[0009] Therefore, an object of the present invention is to provide a resin composition that can be easily molded and is flexible and heavy, and that is made of a thermoplastic resin and an inorganic filler, and to provide a molded article. [Means for solving the problem]

[0010] As a result of extensive research to solve the above-mentioned problems, we have discovered a new polymer composite material that contains 4-methyl-1-pentene / α-olefin copolymer (A), inorganic filler (B), and specific thermoplastic elastomer (C). of The present inventors have found that the above-mentioned problems can be solved by using a resin composition containing the above-mentioned compounds in a specific blending ratio, and have thus completed the present invention.

[0011] That is, the present invention relates to, for example, the following items [1] to [9]. [1] 15 to 50 parts by mass of a 4-methyl-1-pentene / α-olefin copolymer (A) that satisfies at least one of the following requirements (d) and (e): 10 to 50 parts by mass of an inorganic filler (B); 5 to 49 parts by mass of a thermoplastic elastomer (C) (the total amount of the 4-methyl-1-pentene-α-olefin copolymer (A), the inorganic filler (B), and the thermoplastic elastomer (C) is taken as 100 parts by mass); Including, The thermoplastic elastomer (C) is at least one selected from the group consisting of an olefin-based thermoplastic elastomer (C1) and a styrene-based thermoplastic elastomer (C2), and A resin composition characterized by satisfying the following requirements (a) to (c):

[0012] (a) The temperature at which the loss tangent tanδ value obtained by dynamic viscoelasticity measurement at a frequency of 10 rad / s (1.6 Hz) in the temperature range of -40 to 150°C is maximized (hereinafter also referred to as the tanδ peak temperature) is 0°C or higher and 60°C or lower.

[0013] (b) The maximum value of loss tangent tanδ (hereinafter also referred to as tanδ peak value) determined by dynamic viscoelasticity measurement at a frequency of 10 rad / s (1.6 Hz) in the temperature range of −40 to 150° C. is 0.6 or more and 5.0 or less.

[0014] (c) Density is 1.0 g / cm 3 More than 5.0g / cm 3 The following is the result. (d) Consists of 55 to 90 mol % of structural units derived from 4-methyl-1-pentene and 10 to 45 mol % of structural units derived from an α-olefin having 2 to 4 carbon atoms (the total of structural units derived from 4-methyl-1-pentene and structural units derived from an α-olefin having 2 to 4 carbon atoms is 100 mol %).

[0015] (e) The melting point measured by differential scanning calorimetry (DSC) is 160°C or less, or no melting point is observed. [2] The resin composition according to [1], wherein the 4-methyl-1-pentene·α-olefin copolymer (A) satisfies the following requirements (f) and (g):

[0016] (f) The tan δ peak temperature determined by dynamic viscoelasticity measurement at a frequency of 10 rad / s (1.6 Hz) in the temperature range of -40 to 150°C is 15°C or higher and 45°C or lower. (g) The tan δ peak value determined by dynamic viscoelasticity measurement at a frequency of 10 rad / s (1.6 Hz) in the temperature range of -40 to 150°C is 0.6 or more and 5.0 or less.

[0017] [3] The resin composition according to any one of [1] and [2], wherein the inorganic filler (B) is at least one selected from the group consisting of calcium carbonate, magnesium sulfate, barium sulfate, magnesium oxide, and talc.

[0018] [4] The inorganic filler (B) has an average particle size of 0.01 to 100 μm. The resin composition according to any one of [1] to [3].

[0019] [5] A molded article made of the resin composition according to any one of [1] to [4]. [6]

[0022] Daily commodities comprising the resin composition according to any one of [1] to [4].

[0020] [7] A toy made of the resin composition according to any one of [1] to [4]. [8] An ear insert made of the resin composition according to any one of [1] to [4].

[0021] [9] A sheet made of the resin composition according to any one of [1] to [4]. [Effects of the Invention]

[0022] According to the present invention, it is possible to provide a resin composition that can be easily molded, exhibits a high tan δ peak value, and has flexibility and a heavy feel, and a molded article thereof. The molded article made of the resin composition of the present invention can provide, for example, daily necessities and toys, and components for wearable devices such as ear inserts, which have high stress relaxation properties, shape retention (slow recovery to the original shape after elastic deformation), flexibility, and a heavy feel. Therefore, the molded article obtained by the present invention is suitable for, for example, toys, daily necessities, and ear inserts. DETAILED DESCRIPTION OF THE INVENTION

[0023] Specific embodiments of the present invention will be described in detail below, but the present invention is not limited to the following embodiments and can be practiced with appropriate modifications within the scope of the object of the present invention. In this specification, the terms "polymer" and "(co)polymer" are used to include homopolymers and copolymers unless otherwise specified.

[0024] <Resin composition> The resin composition of the present invention contains a 4-methyl-1-pentene·α-olefin copolymer (A), an inorganic filler (B), and a thermoplastic elastomer (C).

[0025] Specifically, it contains 15 to 50 parts by mass of a 4-methyl-1-pentene·α-olefin copolymer (A), 10 to 50 parts by mass of an inorganic filler (B), and 5 to 49 parts by mass of a thermoplastic elastomer (C). The total amount of the 4-methyl-1-pentene·α-olefin copolymer (A), the inorganic filler (B), and the thermoplastic elastomer (C) is 100 parts by mass. In the present invention, the thermoplastic elastomer (C) is at least one selected from the group consisting of an olefin-based thermoplastic elastomer (C1) and a styrene-based thermoplastic elastomer (C2).

[0026] In a typical and preferred embodiment of the present invention, the resin composition of the present invention contains only one of the olefin-based thermoplastic elastomer (C1) and the styrene-based thermoplastic elastomer (C2) as the thermoplastic elastomer (C). In this embodiment, the amount of either the olefin-based thermoplastic elastomer (C1) or the styrene-based thermoplastic elastomer (C2) is 0 parts by mass.

[0027] In the case of a resin composition that does not contain a styrene-based thermoplastic elastomer (C2), the standard of 100 parts by mass is the total amount of the 4-methyl-1-pentene-α-olefin copolymer (A), the inorganic filler (B), and the olefin-based thermoplastic elastomer (C1). In other words, in such a resin composition, the total amount of the 4-methyl-1-pentene-α-olefin copolymer (A), the inorganic filler (B), and the olefin-based thermoplastic elastomer (C1) is taken as 100 parts by mass, 15 to 50 parts by mass of 4-methyl-1-pentene-α-olefin copolymer (A), Inorganic filler (B): 10 to 50 parts by mass, Olefin-based thermoplastic elastomer (C1): 5 to 49 parts by mass but does not include styrene-based thermoplastic elastomer (C2).

[0028] In the case of a resin composition that does not contain an olefin-based thermoplastic elastomer (C1), the 100 parts by mass standard is the total amount of the 4-methyl-1-pentene-α-olefin copolymer (A), the inorganic filler (B), and the styrene-based thermoplastic elastomer (C2). In other words, in such a resin composition, the total amount of the 4-methyl-1-pentene-α-olefin copolymer (A), the inorganic filler (B), and the styrene-based thermoplastic elastomer (C2) is taken as 100 parts by mass, 15 to 50 parts by mass of 4-methyl-1-pentene-α-olefin copolymer (A), Inorganic filler (B): 10 to 50 parts by mass, Styrene-based thermoplastic elastomer (C2): 5 to 49 parts by mass but does not include olefin-based thermoplastic elastomer (C1).

[0029] The resin composition of the present invention satisfies all of the following requirements (a) to (c). Requirement(a) The resin composition of the present invention has a temperature (hereinafter also referred to as "tan δ peak temperature") at which the loss tangent tan δ, determined by dynamic viscoelasticity measurement at a frequency of 10 rad / s (1.6 Hz) in the temperature range of -40 to 150°C, reaches a maximum, and the temperature is from 0°C to 60°C. The lower limit of the tan δ peak temperature is preferably 2°C or higher, and more preferably 4°C or higher. The upper limit of the tan δ peak temperature is preferably 55°C or lower, more preferably 50°C or lower, and particularly preferably 45°C or lower. By adjusting the tan δ peak temperature within the above temperature range, the molded article can exhibit high stress relaxation properties over a wide range of environmental temperatures.

[0030] Requirement (b) The resin composition of the present invention has a maximum value of loss tangent tanδ (hereinafter also referred to as "tanδ peak value") of 0.6 or more and 5.0 or less, as determined by dynamic viscoelasticity measurement at a frequency of 10 rad / s (1.6 Hz) in the temperature range of -40 to 150°C. This tanδ peak value is preferably 0.6 or more and 4.5 or less, more preferably 0.6 or more and 4.0 or less, and particularly preferably 0.6 or more and 3.5 or less. By adjusting the tanδ peak value within the above range, the resulting molded article has excellent stress relaxation properties and can slowly recover to its original shape after elastic deformation.

[0031] The loss tangent tan δ can be calculated as the ratio (G" / G') of the storage modulus (G') to the loss modulus (G") measured by dynamic viscoelasticity. In the present invention, the loss tangent tanδ is determined by dynamic viscoelasticity measurement at a frequency of 10 rad / s (1.6 Hz) in a temperature range of -40 to 150°C. The temperature at which the loss tangent tanδ reaches its maximum value within this temperature range is defined as the tanδ peak temperature, and the value of the loss tangent tanδ at this time is defined as the tanδ peak value. The tanδ peak temperature is believed to be due to the glass transition temperature of the resin composition. Details of the measurement method are as described in the Examples below.

[0032] Requirement(c) The resin composition of the present invention has a density of 1.0 g / cm 3 More than 5.0g / cm 3 Here, the lower limit of the density of the resin composition is 1.05 g / cm or less. 3 It is preferable that the concentration is 1.1 g / cm or more. 3 The upper limit of the density of the resin composition is preferably 4.0 g / cm. 3 It is preferable that the concentration is 3.5 g / cm or less. 3 It is more preferable that the density of the resin composition is within the above range, since a weighty feel can be obtained when the resin composition is molded into a molded article. For example, when used in daily necessities, stability can be expected when placed on a desk, table, etc. Details of the density measurement method are as described in the Examples below.

[0033] Furthermore, when the resin composition of the present invention is formed into a sheet-like molded article, the lower limit of the Shore A hardness (measured in accordance with ASTM D2244, with three 2 mm thick molded articles stacked on top of each other) 15 seconds after the start of contact with the indenter is preferably 10, more preferably 20, and even more preferably 30. On the other hand, the upper limit of the Shore A hardness 15 seconds after the start of contact with the indenter is preferably 95, more preferably 92, and even more preferably 88. The method for producing the molded article is as shown in the examples.

[0034] When the resin composition of the present invention is molded into a sheet, the lower limit of the change in Shore A hardness ΔHS (measured in accordance with ASTM D2244, with three 2 mm thick molded bodies stacked together) defined by the following formula is preferably 5, more preferably 10, and even more preferably 15. On the other hand, the upper limit of ΔHS is preferably 60, more preferably 50, and even more preferably 40.

[0035] ΔHS = (Shore A hardness value immediately after the start of indenter contact - Shore A hardness value 15 seconds after the start of indenter contact) ΔHS can be varied as desired by adjusting the 4-methyl-1-pentene·α-olefin copolymer (A), inorganic filler (B), and thermoplastic elastomer (C) that constitute the resin composition, and when ΔHS is within the above range, the resin composition has excellent flexibility.

[0036] If it is difficult to measure Shore A hardness, a similar evaluation can be performed using Shore D hardness instead. In this case, instead of the above ΔHS, the evaluation can be performed using the value of the change in Shore D hardness ΔHS' defined by the following formula (measured in accordance with ASTM D2244, with three 2 mm thick molded bodies stacked on top of each other):

[0037] ΔHS' = (Shore D hardness value immediately after the start of indenter contact - Shore D hardness value 15 seconds after the start of indenter contact) In this case, the lower limit of ΔHS' is preferably 5, more preferably 8, and even more preferably 11. On the other hand, the upper limit of ΔHS' is preferably 60, more preferably 50, and even more preferably 40. Like the above ΔHS, this ΔHS' can also be changed as desired by the 4-methyl-1-pentene·α-olefin copolymer (A), the inorganic filler (B), and the thermoplastic elastomer (C), and when ΔHS' is within the above range, excellent flexibility is achieved.

[0038] <4-methyl-1-pentene / α-olefin copolymer (A)> The 4-methyl-1-pentene / α-olefin copolymer (A) contained in the resin composition of the present invention preferably satisfies, but is not limited to, one or more of the following requirements (d) to (g), more preferably two or more, even more preferably three or more, and particularly preferably all of them. In a typical embodiment of the present invention, the 4-methyl-1-pentene / α-olefin copolymer (A) satisfies at least one of requirements (d) and (e). That is, the 4-methyl-1-pentene / α-olefin copolymer (A) may satisfy only requirement (d), only requirement (e), or both requirements (d) and (e). In this embodiment, the 4-methyl-1-pentene / α-olefin copolymer (A) preferably further satisfies, in addition to requirements (d) and / or (e), either requirement (f) or requirement (g), particularly preferably both requirements (f) and (g).

[0039] Requirement(d) It is composed of 55 to 90 mol % of structural units derived from 4-methyl-1-pentene (hereinafter sometimes referred to as "structural units (i)") and 10 to 45 mol % of structural units derived from an α-olefin having 2 to 4 carbon atoms (hereinafter sometimes referred to as "structural units (ii)") (the total of structural units (i) and structural units (ii) being 100 mol %).

[0040] Requirement(e) The melting point measured by differential scanning calorimetry (DSC) is 160°C or less, or no melting point is observed.

[0041] Requirement(f) The tan δ peak temperature determined by dynamic viscoelasticity measurement at a frequency of 10 rad / s (1.6 Hz) in the temperature range of -40 to 150°C is 15°C or higher and 45°C or lower.

[0042] Requirements(g) The tan δ peak value determined by dynamic viscoelasticity measurement at a frequency of 10 rad / s (1.6 Hz) in a temperature range of -40 to 150°C is 0.6 or more and 5.0 or less.

[0043] The above requirement (d) stipulates that the 4-methyl-1-pentene-α-olefin copolymer (A) contains a specific ratio of structural units (i) derived from 4-methyl-1-pentene and structural units (ii) derived from an α-olefin having 2 to 4 carbon atoms.

[0044] In this specification, a structural unit derived from an α-olefin refers to a structural unit corresponding to the α-olefin, i.e., a structural unit represented by -CH-CHR- (where R is a hydrogen atom or an alkyl group). The same can be said for the structural unit (i) derived from 4-methyl-1-pentene, and refers to a structural unit corresponding to 4-methyl-1-pentene (i.e., a structural unit represented by -CH-CH(-CHCH(CH))-).

[0045] In the 4-methyl-1-pentene-α-olefin copolymer (A), the lower limit of the amount of structural units derived from 4-methyl-1-pentene is 55 mol %. the law of nature, It is preferably 60 mol%, more preferably 68 mol%. On the other hand, the upper limit of the amount of structural units derived from 4-methyl-1-pentene is 90 mol%, but is preferably 86 mol%, more preferably 85 mol%, and even more preferably 84 mol%.

[0046] In the 4-methyl-1-pentene-α-olefin copolymer (A), if the amount of structural unit (i) derived from 4-methyl-1-pentene is equal to or greater than the above-mentioned lower limit, the tan δ peak temperature measured by dynamic viscoelasticity will be near room temperature, making it easy to adjust the tan δ peak temperature of the resin composition within the above-mentioned range. On the other hand, if the amount of structural unit (i) derived from 4-methyl-1-pentene is equal to or less than the above-mentioned upper limit, the relaxivity at room temperature will increase, and the fit of the molded article will improve.

[0047] Therefore, in the 4-methyl-1-pentene-α-olefin copolymer (A), the upper limit of the amount of the structural unit (ii) derived from an α-olefin having 2 to 4 carbon atoms is 45 mol %. the law of nature, It is preferably 40 mol %, more preferably 32 mol %.

[0048] On the other hand, the lower limit of the amount of structural unit (ii) derived from an α-olefin having 2 to 4 carbon atoms is 10 mol%, preferably 14 mol%, more preferably 15 mol%, and even more preferably 16 mol%.

[0049] The content (mol %) of each structural unit constituting the 4-methyl-1-pentene-α-olefin copolymer (A) is 13 The measurement is carried out by C-NMR. Details of the measurement method are as described in the Examples below.

[0050] Thus, the 4-methyl-1-pentene-α-olefin copolymer (A) used in the present invention contains an α-olefin having 2 to 4 carbon atoms. The resin composition of the present invention containing such a 4-methyl-1-pentene-α-olefin copolymer (A) has a lower degree of crystallinity and a softer composition than a resin composition containing a 4-methyl-1-pentene-α-olefin copolymer consisting of 4-methyl-1-pentene and an α-olefin having a larger number of carbon atoms. Specific examples of the α-olefin having 2 to 4 carbon atoms include ethylene, propylene, and 1-butene, with propylene being particularly preferred. The structural unit (ii) may be derived from one of these compounds or from two or more of them.

[0051] By selecting propylene as the α-olefin having 2 to 4 carbon atoms, uniform and good kneadability of the inorganic filler (B) and the thermoplastic elastomer (C) can be obtained, and a molded article made from the resin composition is likely to have flexibility. The inorganic filler (B) and the thermoplastic elastomer (C) used in the present invention will be described in detail later in the sections "Inorganic filler (B)" and "Thermoplastic elastomer (C)", respectively.

[0052] In a typical embodiment of the present invention, the 4-methyl-1-pentene·α-olefin copolymer (A) constituting the resin composition of the present invention consists only of the structural units (i) and (ii). That is, in this embodiment, the 4-methyl-1-pentene·α-olefin copolymer (A) is a copolymer of 4-methyl-1-pentene and an α-olefin having 2 to 4 carbon atoms.

[0053] Regarding the above requirement (e), the 4-methyl-1-pentene / α-olefin copolymer (A) has a melting point of 160°C or less or no melting point, as measured by a differential scanning calorimeter (DSC), preferably a melting point of 140°C or less or no melting point, and more preferably no melting point, as measured by a differential scanning calorimeter (DSC).

[0054] By satisfying these requirements, the resin composition of the present invention can obtain good kneadability between the inorganic filler (B) and the thermoplastic elastomer (C), thereby improving the stress relaxation properties.

[0055] Regarding the above requirement (f), the 4-methyl-1-pentene / α-olefin copolymer (A) has a tan δ peak temperature determined by dynamic viscoelasticity measurement at a frequency of 10 rad / s (1.6 Hz) in the temperature range of −40 to 150°C of 15°C or higher and 45°C or lower, preferably 20°C or higher and 45°C or lower, and more preferably 25°C or higher and 45°C or lower.

[0056] By setting the tan δ peak temperature within the above range, stress relaxation properties can be more effectively exhibited at around room temperature. Regarding the above requirement (g), the 4-methyl-1-pentene·α-olefin copolymer (A) has a peak tan δ value of 0.6 or more and 5.0 or less, preferably 1.0 or more and 5.0 or less, more preferably 1.5 or more and 5.0 or less, and even more preferably 2.0 or more and 4.0 or less, as determined by dynamic viscoelasticity measurement at a frequency of 10 rad / s (1.6 Hz) in a temperature range of −40 to 150°C.

[0057] By setting the tan δ peak value within the above range, the film has excellent restoring properties, ie, the film tends to gradually return to its original shape in response to tensile stress and the rate of deformation. The 4-methyl-1-pentene-α-olefin copolymer (A) preferably has an intrinsic viscosity [η] measured in decalin at 135°C in the range of 0.1 to 5.0 dL / g, more preferably 0.5 to 4.0 dL / g, and even more preferably 1.0 to 3.5 dL / g. As will be described later, the use of hydrogen during polymerization can control the molecular weight, allowing for a wide range of molecular weights, from low to high, to be obtained, and the intrinsic viscosity [η] can be adjusted to fall within the above range. Details of the measurement method are as described in the Examples below.

[0058] The 4-methyl-1-pentene-α-olefin copolymer (A) has a weight average molecular weight (Mw) of 1,000 to 1,000,000 in terms of polystyrene, as measured by gel permeation chromatography (GPC). in It is preferable that the in It is more preferable that the number of in It is more preferable that the measurement method is as described in detail in the Examples below.

[0059] The 4-methyl-1-pentene-α-olefin copolymer (A) preferably has a molecular weight distribution (Mw / Mn), which is the ratio of weight average molecular weight (Mw) to number average molecular weight (Mn), measured by gel permeation chromatography (GPC), in the range of 1.0 to 3.5, more preferably 1.2 to 3.0, and even more preferably 1.5 to 2.8. in When the molecular weight distribution (Mw / Mn) is 3.5 or less, the influence of low molecular weight and low stereoregular polymers resulting from the composition distribution is small, and the mechanical strength of the resulting molded article is less likely to decrease, which is preferable.

[0060] The melt mass flow rate (MFR; based on ASTM D1238, temperature 230°C, load 2.16 kg) of the 4-methyl-1-pentene-α-olefin copolymer (A) is preferably 0.1 to 100 g / 10 min, more preferably 0.5 to 50 g / 10 min, and even more preferably 1.0 to 30 g / 10 min.

[0061] When the melt mass-flow rate (MFR) of the 4-methyl-1-pentene·α-olefin copolymer (A) is equal to or greater than the lower limit of the above range, good dispersibility of the inorganic filler (B) and the thermoplastic elastomer (C) can be obtained.

[0062] When the molecular weight is equal to or less than the upper limit of the above range, the molecular weight of the resin is not too low, and a molded article having sufficient mechanical strength can be obtained, which is preferable. The density of the 4-methyl-1-pentene-α-olefin copolymer (A) is preferably 830 to 870 kg / m 3 , more preferably 830 to 860 kg / m 3 , and more preferably 830 to 850 kg / m 3 The density of the 4-methyl-1-pentene-α-olefin copolymer (A) can be appropriately adjusted by adjusting the comonomer composition ratio of the 4-methyl-1-pentene-α-olefin copolymer. The 4-methyl-1-pentene-α-olefin copolymer (A) having a density within the above range is advantageous because it exhibits good kneadability with the inorganic filler (B) and good uniform dispersibility in the thermoplastic elastomer (C), i.e., in both the olefin-based thermoplastic elastomer (C1) and the styrene-based thermoplastic elastomer (C2).

[0063] The amount of the 4-methyl-1-pentene-α-olefin copolymer (A) added to the resin composition of the present invention is the total amount of the 4-methyl-1-pentene-α-olefin copolymer (A), the inorganic filler (B), and the thermoplastic elastomer (C). 1 The amount is 15 to 50 parts by mass relative to 00 parts by mass. The amount added is preferably at least a certain amount, more preferably 20 parts by mass or more, in order to enable a molded product made from the resin composition to exhibit a high tan δ peak value. On the other hand, the amount added is preferably at most a certain amount, more preferably 50 parts by mass or less, in order to enable a molded product made from the resin composition to have a heavy feel.

[0064] <Method for producing 4-methyl-1-pentene-α-olefin copolymer (A)> The method for producing the 4-methyl-1-pentene-α-olefin copolymer (A) is not particularly limited. For example, the copolymer can be produced by polymerizing 4-methyl-1-pentene and the above-mentioned α-olefin having 2 to 4 carbon atoms in the presence of an appropriate polymerization catalyst such as a magnesium-supported titanium catalyst or a metallocene catalyst.

[0065] Suitable polymerization catalysts that can be used here include conventionally known catalysts, such as magnesium-supported titanium catalysts and the metallocene catalysts described in International Publication Nos. 01 / 53369, 01 / 27124, JP-A-3-193796, JP-A-2-41303, JP-A-2011 / 055803, JP-A-2014 / 050817, etc. Polymerization can be carried out by a method appropriately selected from liquid-phase polymerization methods, including solution polymerization and suspension polymerization, and gas-phase polymerization methods.

[0066] In the liquid phase polymerization method, an inert hydrocarbon solvent can be used as a solvent constituting the liquid phase. Examples of the inert hydrocarbon include aliphatic hydrocarbons such as propane, butane, pentane, hexane, heptane, octane, decane, dodecane, and kerosene, alicyclic hydrocarbons such as cyclopentane, cyclohexane, methylcyclopentane, and methylcyclohexane, aromatic hydrocarbons such as benzene, toluene, and xylene, and halogenated hydrocarbons such as ethylene chloride, chlorobenzene, dichloromethane, trichloromethane, and tetrachloromethane, and mixtures thereof.

[0067] Furthermore, in the liquid phase polymerization method, bulk polymerization can also be performed using the monomer corresponding to the structural unit (i) derived from the aforementioned 4-methyl-1-pentene (i.e., 4-methyl-1-pentene) or the monomer corresponding to the structural unit (ii) derived from the aforementioned α-olefin having 2 to 4 carbon atoms (i.e., the aforementioned α-olefin having 2 to 4 carbon atoms) itself as a solvent.

[0068] Furthermore, by copolymerizing the above-mentioned 4-methyl-1-pentene with the above-mentioned α-olefin having 2 to 4 carbon atoms in a stepwise manner, it is also possible to appropriately control the composition distribution of the 4-methyl-1-pentene structural units (i) and the α-olefin structural units (ii) constituting the 4-methyl-1-pentene-α-olefin copolymer (A).

[0069] The polymerization temperature is preferably −50 to 200° C., more preferably 0 to 100° C., and even more preferably 20 to 100° C. The polymerization pressure is preferably atmospheric pressure to 10 MPa gauge pressure (i.e., atmospheric pressure or higher (atmospheric pressure + 10 MPa) or lower), and more preferably atmospheric pressure to 5 MPa gauge pressure (i.e., atmospheric pressure or higher (atmospheric pressure + 5 MPa) or lower).

[0070] During polymerization, hydrogen may be added for the purpose of controlling the molecular weight and polymerization activity of the resulting polymer. The appropriate amount of hydrogen to be added is about 0.001 to 100 nL per 1 kg of the total amount of the 4-methyl-1-pentene and the α-olefin having 2 to 4 carbon atoms.

[0071] <Inorganic filler (B)> The resin composition of the present invention contains, in addition to the 4-methyl-1-pentene / α-olefin copolymer (A), an inorganic filler (B), which provides the resin composition of the present invention with sufficient impact strength and weight.

[0072] The inorganic filler (B) is not particularly limited as long as it is an inorganic compound, and known inorganic fillers can be used. For example, carbon black 、 graphite 、 Carbon black surface-treated with a silane coupling agent or the like, oxide-based fillers including finely powdered silicic acid, silica (including fumed silica, precipitated silica, diatomaceous earth, and quartz), alumina, iron oxide, ferrite, magnesium oxide, titanium oxide, antimony trioxide, zirconium oxide, barium oxide, and calcium oxide, hydroxide-based fillers including aluminum hydroxide and magnesium hydroxide, silicate-based fillers including aluminum silicate (clay), magnesium silicate (talc), mica, kaolin, calcium silicate, glass fiber, glass flakes, and glass beads, Sedimentary rock fillers including diatomaceous earth and limestone, clay mineral fillers including montmorillonite, magnesian montmorillonite, tetromaine montmorillonite, tetromaine magnesian montmorillonite, beidellite, aluminian beidellite, nontronite, aluminian nontronite, saponite, aluminian saponite, hectorite, sauconite, stevensite, and bentonite, magnetic fillers including ferrite, iron, and cobalt, conductive fillers including silver, gold, copper, and their alloys, aluminum nitride, boron nitride, silicon nitride, hmm Car Bike Doand the like; sulfate-based fillers including aluminum sulfate, magnesium sulfate, barium sulfate, calcium sulfate, and the like; sulfite-based fillers including calcium sulfite, calcium carbonate, basic magnesium carbonate, dolomite, barium titanate, potassium titanate, and the like.

[0073] Among the above, as the inorganic filler (B) used in the present invention, silica, magnesium sulfate, barium sulfate, calcium carbonate, magnesium hydroxide, magnesium oxide, and talc are preferred, magnesium sulfate, barium sulfate, calcium carbonate, magnesium oxide, and talc are more preferred, magnesium sulfate, barium sulfate, calcium carbonate, and talc are even more preferred, and barium sulfate, calcium carbonate, and talc are most preferred from the viewpoints of performance, ease of handling, supply stability, price, etc.

[0074] These inorganic fillers (B) may be used alone or in combination of two or more kinds within the range that does not impair the properties of the present invention. The particle size of the inorganic filler (B) is preferably 0.01 μm to 100 μm, more preferably 0.01 μm to 80 μm, and even more preferably 0.01 μm to 50 μm, from the viewpoint of moldability with the 4-methyl-1-pentene-α-olefin copolymer (A) and the thermoplastic elastomer (C).

[0075] The particle size of the inorganic filler (B) can be determined by a known method using a laser diffraction particle size distribution analyzer, and specifically, it is the 50% average particle size (d50) obtained from the cumulative % distribution curve measured with the laser diffraction particle size distribution analyzer.

[0076] The amount of inorganic filler (B) added to the resin composition of the present invention is determined based on the ratio of the 4-methyl-1-pentene / α-olefin copolymer (A), the inorganic filler (B), and heat Total amount including thermoplastic elastomer (C) 1The amount is 10 to 50 parts by mass relative to 00 parts by mass. The amount added is preferably at least a certain amount, more preferably 20 parts by mass or more, from the viewpoint of obtaining a weighty feel and sufficient impact strength in a molded article made from the resin composition. On the other hand, the amount added is preferably at most a certain amount, more preferably 50 parts by mass or less, from the viewpoint of obtaining high stress relaxation properties in a molded article made from the resin composition, i.e., shape retention properties in which the molded article slowly recovers to its original shape after elastic deformation.

[0077] When two or more types of inorganic filler (B) are used, the above-mentioned numerical ranges are applied to the total amount of inorganic filler (B) added. <Thermoplastic elastomer (C)> The resin composition of the present invention contains a thermoplastic elastomer (C) in addition to the 4-methyl-1-pentene-α-olefin copolymer (A) and the inorganic filler (B). The "thermoplastic elastomer (C)" used in the present invention is at least one selected from the group consisting of an olefin-based thermoplastic elastomer (C1) and a styrene-based thermoplastic elastomer (C2). In the present invention, both the olefin-based thermoplastic elastomer (C1) and the styrene-based thermoplastic elastomer (C2) described below function to adjust the tan δ peak temperature of the resin composition of the present invention to a range of 0°C to 60°C. In a typical and preferred embodiment of the present invention, the resin composition of the present invention contains only one of the olefin-based thermoplastic elastomer (C1) and the styrene-based thermoplastic elastomer (C2).

[0078] In a first aspect of the present invention, the resin composition of the present invention contains the 4-methyl-1-pentene·α-olefin copolymer (A), the inorganic filler (B), and an olefin-based thermoplastic elastomer (C1), but does not contain a styrene-based thermoplastic elastomer (C2).

[0079] In a second aspect of the present invention, the resin composition of the present invention contains the 4-methyl-1-pentene·α-olefin copolymer (A), the inorganic filler (B), and a styrene-based thermoplastic elastomer (C2), but does not contain an olefin-based thermoplastic elastomer (C1).

[0080] Olefin-based thermoplastic elastomer (C1) The olefin-based thermoplastic elastomer (C1) is not particularly limited, and conventionally known resins can be used. Specific examples include ethylene-based polymers, propylene-based polymers, and butene-based polymers. More specifically, Copolymers of ethylene and α-olefins having 3 to 20 carbon atoms, copolymers of ethylene and α-olefins having 3 to 20 carbon atoms and cyclic olefins, and ethylene copolymers using various vinyl compounds as comonomers such as styrene, vinyl acetate, (meth)acrylic acid, and (meth)acrylic acid esters. ethylene various ethylene-based elastomers, such as ethylene-based copolymers, and ethylene-based elastomers having a sea-island structure containing polyethylene as a hard segment; Propylene-based elastomers made from propylene copolymers such as copolymers of propylene and an α-olefin having 4 to 20 carbon atoms, copolymers of propylene, ethylene and an α-olefin having 4 to 20 carbon atoms, and copolymers of propylene, an α-olefin having 4 to 20 carbon atoms and a cyclic olefin, as well as various propylene-based elastomers such as propylene-based elastomers having a sea-island structure containing polypropylene as a hard segment; and butene-based elastomers consisting of 1-butene copolymers such as copolymers of 1-butene and an α-olefin having 5 to 20 carbon atoms, and copolymers of 1-butene and an α-olefin having 5 to 20 carbon atoms and a cyclic olefin, as well as various butene-based elastomers such as butene-based elastomers having a sea-island structure containing polybutene as a hard segment; etc.

[0081] Here, "ethylene-based copolymer" refers to a copolymer containing ethylene as the main component (specifically, containing 50% by mass or more, preferably 70% by mass or more, of ethylene), "propylene-based copolymer" refers to a copolymer containing propylene as the main component (specifically, containing 50% by mass or more, preferably 70% by mass or more, of propylene), and "butene-based copolymer" refers to a copolymer containing butene as the main component (specifically, containing 50% by mass or more, preferably 70% by mass or more, of butene).

[0082] In one preferred embodiment of the present invention, the olefin-based thermoplastic elastomer (C1) is a copolymer of propylene, ethylene, and an α-olefin having 4 to 20 carbon atoms, and a preferred example thereof is a copolymer of propylene, ethylene, and butene.

[0083] The olefin-based thermoplastic elastomer (C1) that can be used in the present invention may be one type alone or a combination of two or more types. In the present invention, the olefinic thermoplastic elastomer (C1) may be an unmodified olefinic thermoplastic elastomer, or an olefinic thermoplastic elastomer modified with at least one functional group selected from the group consisting of an acid anhydride group, a carboxyl group, an amino group, an imino group, an alkoxysilyl group, a silanol group, a silyl ether group, a hydroxyl group, and an epoxy group. did It may be a modified olefinic thermoplastic elastomer. In one preferred embodiment of the present invention, the olefinic thermoplastic elastomer (C1) is an unmodified olefinic thermoplastic elastomer.

[0084] Among the above, a propylene-based copolymer is preferred as the olefin-based thermoplastic elastomer (C1) because of its good kneadability with the 4-methyl-1-pentene-α-olefin copolymer (A) and the inorganic filler (B), its ease of molding into the resin composition of the present invention, and the fact that it can be easily molded into a flexible molded product.

[0085] Styrene-based thermoplastic elastomer (C2) Examples of styrene-based thermoplastic elastomers (C2) include block copolymers of a polystyrene block (or crystalline portion) and a diene monomer block (or amorphous portion), where the hard portion may be located at both ends of the soft portion. Examples of styrene-based thermoplastic elastomers (C2) include styrene-butadiene-styrene copolymers (SBS), hydrogenated styrene-butadiene-styrene copolymers (HSBR), styrene-ethylene-propylene-styrene block copolymers (SEPS), styrene-ethylene-butene-styrene block copolymers (SEBS), styrene-isoprene-styrene block copolymers (SIS), styrene-isobutylene-styrene copolymers (SIBS), styrene-isobutylene copolymers (SIB), and styrene-ethylene-butene-styrene-styrene copolymers (SEBSS).

[0086] The styrene-based thermoplastic elastomer (C2) that can be used in the present invention may be one type alone or a combination of two or more types. As the styrene-based thermoplastic elastomer (C2), commercially available products can also be used.

[0087] An example of HSBR is Dynaron (registered trademark) manufactured by JSR Corporation. SEPS is a polymer obtained by hydrogenating a styrene-isoprene-styrene block copolymer (SIS). Examples of SIS include JSR SIS (registered trademark) manufactured by JSR Corporation, Hybler (registered trademark) manufactured by Kuraray Co., Ltd., and Kraton D (registered trademark) manufactured by Kraton Polymer Japan Co., Ltd. Examples of SEPS include Septon (registered trademark) manufactured by Kuraray Co., Ltd. and Kraton (registered trademark) manufactured by Kraton Polymer Japan Co., Ltd. Examples of SEBS include Tuftec H Series (registered trademark) manufactured by Asahi Kasei Corporation and Kraton (registered trademark) manufactured by Kraton Japan Polymer Co., Ltd. Examples of SEBSS include SOE (registered trademark) manufactured by Asahi Kasei Corporation, which has a structure containing styrene in the soft part as well. Examples of SIB and SIBS include Shibstar (registered trademark) manufactured by Kaneka Corporation. Examples of commercially available compounds obtained by combining the above-mentioned styrene copolymer with other resins such as polyolefins include TEFABLOC (registered trademark) manufactured by Mitsubishi Chemical Corporation, ARNESTON (registered trademark) manufactured by Kuraray Plastics Co., Ltd., and ELASTOMER AR Series (registered trademark) manufactured by Aronkasei Co., Ltd.

[0088] Amount of thermoplastic elastomer (C) added The amount of the thermoplastic elastomer (C) added to the resin composition of the present invention is the total amount of the 4-methyl-1-pentene-α-olefin copolymer (A), the inorganic filler (B), and the thermoplastic elastomer (C). 1 The amount added is preferably 5 to 49 parts by mass relative to 00 parts by mass. The amount added is preferably a certain amount or more, more preferably 10 parts by mass or more, from the viewpoint of adjusting the tan δ peak temperature of the resin composition to a range of 0°C or more and 60°C or less. On the other hand, the amount added is preferably a certain amount or less, more preferably 40 parts by mass or less, from the viewpoint of shape retention, that is, the molded article made of the resin composition slowly recovers to its original shape after elastic deformation.

[0089] Here, when two or more types of thermoplastic elastomer (C) are used (i.e., when two or more types of olefin-based thermoplastic elastomers are used as the olefin-based thermoplastic elastomer (C1), and when two or more types of styrene-based thermoplastic elastomers are used as the styrene-based thermoplastic elastomer (C2)), the above-mentioned numerical ranges are applied to the total amount of thermoplastic elastomer (C) that can be contained in the resin composition of the present invention.

[0090] <Other ingredients> The resin composition of the present invention contains the 4-methyl-1-pentene-α-olefin copolymer (A), the inorganic filler (B), and the thermoplastic elastomer (C). The resin composition of the present invention may consist of the 4-methyl-1-pentene-α-olefin copolymer (A), the inorganic filler (B), and the thermoplastic elastomer (C). However, the resin composition of the present invention may further contain other components (hereinafter referred to as "other components") that do not fall under the category of the 4-methyl-1-pentene-α-olefin copolymer (A), the inorganic filler (B), or the thermoplastic elastomer (C), as needed, provided that the properties of the present invention are not impaired. Examples of such "other components" include known additives.

[0091] Examples of additives include, but are not limited to, softeners, release agents, antioxidants, flame retardants, ultraviolet absorbers, surfactants, antistatic agents, pigments, dyes, slip agents, weather stabilizers, heat stabilizers, infrared absorbers, antiblocking agents, antifogging agents, lubricants, plasticizers, antioxidants, hydrochloric acid absorbers, crystal nucleating agents, antifungal agents, antibacterial agents, and organic fillers. These additives may be used alone or in combination of two or more.

[0092] Examples of softeners include known softeners such as process oil, lubricating oil, paraffin, liquid paraffin, polyethylene wax, polypropylene wax, petroleum-based substances including petroleum asphalt and Vaseline; coal tars including coal tar and coal tar pitch; fatty oils including castor oil, linseed oil, rapeseed oil, soybean oil and coconut oil; waxes including tall oil, beeswax, carnauba wax and lanolin; fatty acids or metal salts thereof including ricinoleic acid, palmitic acid, stearic acid, 12-hydroxystearic acid, montanic acid, oleic acid and erucic acid; synthetic polymers including petroleum resin, coumarone-indene resin and atactic polypropylene; ester-based plasticizers including dioctyl phthalate, dioctyl adipate and dioctyl sebacate; microcrystalline wax; liquid polybutadiene or modified or hydrogenated polybutadiene;

[0093] Furthermore, softeners include aromatic carboxylic acid esters (dibutyl phthalate, etc.), aliphatic carboxylic acid esters (methyl acetylricinoleate, etc.), and aliphatic dicarboxylic acid esters. mosquito Examples include carboxylic acid esters (such as adipic acid-propylene glycol polyesters), aliphatic tricarboxylic acid esters (such as triethyl citrate), phosphate triesters (such as triphenyl phosphate), epoxy fatty acid esters (such as epoxybutyl stearate), and petroleum resins.

[0094] Examples of release agents include lower alcohol esters (having 1 to 4 carbon atoms) of higher fatty acids (butyl stearate, etc.), polyhydric alcohol esters (having 4 to 30 carbon atoms) of fatty acids (hydrogenated castor oil, etc.), glycol esters of fatty acids, and liquid paraffin.

[0095] Examples of antioxidants include phenol-based (2,6-di-t-butyl-4-methylphenol, etc.), polycyclic phenol-based (2,2'-methylenebis(4-methyl-6-t-butylphenol) and other methylene-bridged polycyclic phenols, etc.), phosphorus-based (tetrakis(2,4-di-t-butylphenyl)-4,4-biphenylenediphosphonate, etc.), and amine-based (N,N-diisopropyl-p-phenylenediamine, etc.).

[0096] Examples of flame retardants include ammonium polyphosphate, ethylene bistris(2-cyanoethyl)phosphonium chloride, and tris(tribromophenyl)phosphate. 、 Examples of flame retardants include phosphate esters such as tris(3-hydroxypropyl)phosphine oxide and other phosphorus compounds, chlorinated paraffins, chlorinated polyolefins, perchlorocyclopentadecane and other chlorinated flame retardants, hexabromobenzene, ethylene bisdibromonorbornanedicarboximide, ethylene bistetrabromophthalimide, tetrabromobisphenol A derivatives, tetrabromobisphenol S, and tetrabromodipentaerythritol and other brominated flame retardants, and mixtures thereof.

[0097] Examples of ultraviolet absorbers include benzotriazole-based, benzophenone-based, salicylic acid-based, and acrylate-based ones. Examples of antibacterial agents include quaternary ammonium salts, pyridine compounds, organic acids, organic acid esters, halogenated phenols, and organic iodines.

[0098] Examples of surfactants include nonionic, anionic, cationic, and amphoteric surfactants. Examples of nonionic surfactants include polyethylene glycol-type nonionic surfactants such as higher alcohol ethylene oxide adducts, fatty acid ethylene oxide adducts, higher alkylamine ethylene oxide adducts, and polypropylene glycol ethylene oxide adducts, and polyhydric alcohol-type nonionic surfactants such as fatty acid esters of polyethylene oxide or glycerin, fatty acid esters of pentaerythritol, fatty acid esters of sorbit or sorbitan, alkyl ethers of polyhydric alcohols, and fatty amides of alkanolamines. Examples of anionic surfactants include alkali metal salts of higher fatty acids. 、 Examples of the surfactant include sulfonates such as sulfate salts, alkylbenzenesulfonates, alkylsulfonates, and paraffin sulfonates, and phosphate salts such as higher alcohol phosphate salts. Examples of the cationic surfactant include quaternary ammonium salts such as alkyltrimethylammonium salts. Examples of the amphoteric surfactant include amino acid amphoteric surfactants such as higher alkylaminopropionates. sex surfactants, betaine-type amphoteric surfactants such as higher alkyl dimethyl betaine and higher alkyl dihydroxyethyl betaine.

[0099] Examples of the antistatic agent include the surfactants, fatty acid esters, and polymeric antistatic agents. Examples of the fatty acid esters include esters of stearic acid and oleic acid, and examples of the polymeric antistatic agents include polyether ester amides.

[0100] Examples of pigments include inorganic pigments. pigment Examples of suitable pigments include titanium oxide, iron oxide, chromium oxide, and cadmium sulfide, and organic pigments such as azo lake pigments, thioindigo pigments, phthalocyanine pigments, and anthraquinone pigments. Examples of suitable dyes include azo pigments, anthraquinone pigments, and triphenylmethane pigments.

[0101] The amount of these pigments and dyes added is not particularly limited, but is usually 5 parts by mass or less, preferably 0.1 to 3 parts by mass, per 100 parts by mass of the resin composition of the present invention. Examples of slip agents include waxes (such as carnauba wax), higher fatty acids (such as stearic acid), higher fatty acid salts (such as calcium stearate), higher alcohols (such as stearyl alcohol), and higher fatty acid amides (such as stearamide and erucamide).

[0102] The amounts of the above-mentioned various additives to be added are not particularly limited depending on the application as long as the object of the present invention is not impaired, but it is preferable that the total amount of each additive be 0.01 to 30 parts by mass per 100 parts by mass of the resin composition of the present invention.

[0103] Typical and exemplary embodiments of the resin composition of the present invention include the following (X1) to (X4): (X1) a resin composition comprising the 4-methyl-1-pentene / α-olefin copolymer (A), the inorganic filler (B), and the olefin-based thermoplastic elastomer (C1); (X2) a resin composition comprising the 4-methyl-1-pentene / α-olefin copolymer (A), the inorganic filler (B), and the styrene-based thermoplastic elastomer (C2); (X3) a resin composition consisting only of the 4-methyl-1-pentene / α-olefin copolymer (A), the inorganic filler (B), the olefin-based thermoplastic elastomer (C1), and the various additives; (X4) A resin composition consisting only of the 4-methyl-1-pentene-α-olefin copolymer (A), the inorganic filler (B), the styrene-based thermoplastic elastomer (C2), and the various additives. 。 When the resin composition of the present invention contains "other components," the total amount of the "other components" in the resin composition of the present invention is preferably 0.01 to 30 parts by mass, and more preferably 0.1 to 3 parts by mass, per 100 parts by mass of the total amount of the 4-methyl-1-pentene-α-olefin copolymer (A), the inorganic filler (B), and the thermoplastic elastomer (C).

[0104] <Method of manufacturing resin composition> The method for producing the resin composition of the present invention is not particularly limited, and any conventionally known production method can be used. One example is a method in which the 4-methyl-1-pentene-α-olefin copolymer (A), the inorganic filler (B), the thermoplastic elastomer (C), and the optional "other components" constituting the resin composition of the present invention are dry-blended using a known mixer. Examples of the mixer include a Henschel mixer, a tumbler blender, and a V-blender.

[0105] After dry blending in the mixer, the components can be melt-kneaded at a temperature of, for example, 180 to 250°C using a single-screw extruder, twin-screw extruder, Banbury mixer, kneader, roll mill, or the like, followed by granulation or pulverization. Among these, melt-kneading using a twin-screw extruder or Banbury mixer is preferred from the standpoint of the mixability of the components and productivity. These methods can produce high-quality pellets in which the components are uniformly mixed and dispersed.

[0106] The inorganic filler (B) may be a mixture with a resin component such as the 4-methyl-1-pentene-α-olefin copolymer (A), for example, a masterbatch prepared by previously mixing the inorganic filler (B) with a resin component such as the 4-methyl-1-pentene-α-olefin copolymer (A). of It may also be used in the form

[0107] <Method of manufacturing molded body> The molded article of the present invention is made of the resin composition of the present invention described above. Examples of the molded article of the present invention include toys, daily necessities, ear inserts, and sheet-like molded articles.

[0108] The method for producing the molded article of the present invention is not particularly limited, and for example, a conventionally known production method can be used, such as injection molding, extrusion molding, compression molding, 3D modeling, microwave heating molding, etc. Among such molding methods, injection molding using a required mold is preferred, and a molded article can be suitably produced by such injection molding.

[0109] Furthermore, when a sheet-like molded product is to be obtained, extrusion sheet molding using a general T-die is preferred. A sheet can be produced by film formation using a single-screw extruder or twin-screw extruder equipped with a T-die, with a cylinder temperature of 180 to 250°C and a casting roll temperature of 20 to 80°C. The thickness of the sheet will vary depending on the application, but is usually 10 to 1000 μm, preferably 20 to 500 μm, so that pinholes do not occur during sheet molding, sufficient mechanical strength is obtained, and the sheet can be mass-produced.

[0110] The surface of the sheet may be embossed, or the sheet may be stretched during or after molding. Furthermore, in order to remove residual stress from the sheet, the sheet may be annealed at a temperature below the melting point of the resin.

[0111] <Uses of molded products> The molded article made of the resin composition of the present invention has a feature that it improves the fit due to its high stress relaxation property in the room temperature range, and also slowly recovers to its original shape after elastic deformation.

[0112] Molded articles made from the resin composition of the present invention are useful not only for daily necessities, toys, ear inserts, and seats, but also for conventionally known automotive materials, clothing materials, sanitary materials, construction materials, sports materials, living materials, leisure materials, industrial materials, electronic materials, and the like.

[0113] It can also be used in the field of household goods. Specific examples include containers for holding food, forks and spoons (especially the handles and grips of forks and spoons), and tableware such as plates. These can be easily molded by injection molding, and they have a sense of weight, making them useful as containers and tableware to replace ceramics.

[0114] It can also be used for other applications of ceramics, such as everyday items like lampshades and vases, structural components for certain audio speakers, and plumbing products like washbasins and toilets. Taking advantage of its ability to impart a sense of weight, it can also be used for other applications besides ceramics, such as plastic models, components for musical instruments, tiles, artificial marble substitutes, and building components. It is also useful as a container for lidded containers (including airless containers) and cosmetic compacts. Its moldability and shape retention make it useful as a filament material for 3D printers.

[0115] Furthermore, by taking advantage of the weight, feel and design of the material, it is also useful as an ear insert, for example, allowing the hearing aid to be properly fitted in the ear and used stably and comfortably. Recently, wearable devices that allow devices to be carried around have become increasingly popular. Among these, the material is useful for earphone components that connect to audio equipment using a connector or listen via wireless communication such as Bluetooth, Wi-Fi, or infrared. It reduces pressure on the ear and prevents excessive earphone movement, resulting in a comfortable fit. It can also be used as a band component for smartwatches.

[0116] Furthermore, by taking advantage of the inorganic material's fillability and conformability, it is also useful as a heat dissipation material for electronic information materials, for example. In particular, the amount of heat emitted from electronic devices has increased recently due to the high-definition of semiconductor circuits, making it necessary to improve the efficiency of heat dissipation materials. By taking advantage of the adhesiveness and conformability, it is possible to efficiently improve the heat dissipation effect. [Example]

[0117] The present invention will be described in more detail below based on examples, but the present invention is not limited to these examples. The methods for measuring the physical properties of resins, the resins used, the methods for preparing test pieces, and the evaluation methods in the following examples and comparative examples are as follows.

[0118] [Method for measuring resin physical properties] <Content of structural units> The 4-methyl-1-pentene and α-olefin contents in the polymer were quantified using the following equipment and conditions: 13 The α-olefin content measured by C-NMR is based on the results. However, the α-olefin content measured by this method does not include the content of 4-methyl-1-pentene.

[0119] Using a JEOL ECP500 nuclear magnetic resonance spectrometer, the sample was analyzed using a mixed solvent of orthodichlorobenzene / deuterated benzene (80 / 20% by volume), a sample concentration of 55 mg / 0.6 mL, a measurement temperature of 120°C, and observation nuclei. 13 The measurement was performed using C (125 MHz), the sequence was single pulse proton decoupling, the pulse width was 4.7 μs (45° pulse), the repetition time was 5.5 s, the number of accumulations was more than 10,000, and 27.50 ppm was used as the reference value for the chemical shift. 13 C-NMR spectrum shows that 4-methyl-1-pentene-α-olefin copolymer The composition of (A) was quantified.

[0120] <Intrinsic viscosity> The values ​​were measured in decalin at 135°C using an Ubbelohde viscometer. Polymer powder of Approximately 20 mg was collected and dissolved in 15 mL of decalin, and the specific viscosity ηsp of the resulting decalin solution was measured in an oil bath heated to 135 °C. After diluting this decalin solution with 5 mL of decalin solvent, the specific viscosity ηsp was measured in the same manner. This dilution procedure was repeated two more times, and the value of ηsp / C when the concentration (C) was extrapolated to zero was calculated as the limiting viscosity [η] (see the formula below).

[0121] [η]=lim(ηsp / C) (C→0) <Weight average molecular weight (Mw), number average molecular weight (Mn), molecular weight distribution (Mw / Mn value)> The molecular weight was measured by gel permeation chromatography (GPC).

[0122] Specifically, a Waters ALC / GPC150-Cplus liquid chromatograph (integrated with a differential refractometer detector) was used, and two Tosoh GMH6-HT and two Tosoh GMH6-HTL separation columns were connected in series. The mobile phase consisted of o-dichlorobenzene and 0.025% by weight dibutylhydroxytoluene (Takeda Pharmaceutical Co., Ltd.) as the antioxidant. The mobile phase was run at 1.0 mL / min, the sample concentration was 15 mg / 10 mL, the sample injection volume was 500 μL, and a differential refractometer was used as the detector. Tosoh standard polystyrenes with weight-average molecular weights (MW) of 1,000 to 4,000,000 were used.

[0123] The weight-average molecular weight (Mw), number-average molecular weight (Mn), and molecular weight distribution (Mw / Mn value) were calculated by analyzing the obtained chromatogram using a calibration curve prepared by a known method using a standard polystyrene sample. The measurement time per sample was 60 minutes.

[0124] <Melt mass-flow rate (MFR)> Measurement was performed at a temperature of 230°C and a load of 2.16 kg in accordance with ASTM D1238. <Melting point> The melting point was determined as the highest temperature at the apex of the melting peak measured at a heating rate of 10°C / min using a differential scanning calorimeter DSC220C manufactured by Seiko Instruments Inc. in accordance with JIS K7121.

[0125] <Density of 4-methyl-1-pentene-α-olefin copolymer (A)> Density of 4-methyl-1-pentene-α-olefin copolymer (A) (kg / m 3 ) was measured using a density gradient tube in accordance with JIS K7112.

[0126] <Synthesis of 4-methyl-1-pentene-α-olefin copolymer (A)> A 1.5 L stainless steel autoclave equipped with a stirring blade and thoroughly purged with nitrogen was charged with 300 ml of n-hexane (dried over activated alumina under a dry nitrogen atmosphere) and 450 ml of 4-methyl-1-pentene at 23° C. 0.75 ml of a 1.0 mmol / ml toluene solution of triisobutylaluminum (TIBAL) was charged to the autoclave and stirred.

[0127] Next, the autoclave was heated to an internal temperature of 60°C and pressurized with propylene to a total pressure (gauge pressure) of 0.40 MPa. Next, 0.34 ml of a toluene solution containing 1 mmol of methylaluminoxane (calculated as aluminum) and 0.01 mmol of diphenylmethylene(1-ethyl-3-t-butyl-cyclopentadienyl)(2,7-di-t-butyl-fluorenyl)zirconium dichloride, which had been prepared in advance, was injected into the autoclave with nitrogen pressure to initiate the polymerization reaction.

[0128] During the polymerization reaction, the internal temperature of the autoclave was adjusted to 60°C. Sixty minutes after the start of polymerization, 5 ml of methanol was injected into the autoclave with nitrogen to terminate the polymerization reaction, and the pressure inside the autoclave was then reduced to atmospheric pressure. After the pressure was reduced, acetone was added to the reaction solution while stirring.

[0129] The resulting powdery copolymer containing the solvent was dried at 100°C under reduced pressure for 12 hours. The weight of the product, 4-methyl-1-pentene-α-olefin copolymer (A), was 36.9 g, and the 4-methyl-1-pentene content in the copolymer was 72.3 mol% and the propylene content was 27.7 mol%. DSC measurement showed no melting point. The measurement results for each physical property are shown in Table 1.

[0130] <Dynamic Viscoelasticity Measurement of 4-Methyl-1-pentene-α-Olefin Copolymer (A)> A predetermined amount of 4-methyl-1-pentene·α-olefin copolymer (A) obtained by the method described above was filled into a stainless steel mold. Using a hydraulic heat press (PEWR-30 manufactured by Kansai Roll Co., Ltd.) with the heating plate set to 200°C, the copolymer was preheated for 7 minutes and pressed at a gauge pressure of 10 MPa for 2 minutes. The mixture was then transferred to a cooling plate set to 20°C, compressed at a gauge pressure of 10 MPa, and cooled for 3 minutes to produce a 2.0 mm thick press sheet for measurement.

[0131] Next, test pieces measuring 35 mm in length and 10 mm in width were punched out from the 2.0 mm thick measurement press sheet obtained using the method described above. The temperature dispersion of the dynamic viscoelasticity was observed from -40 to 150°C using a rheometer (Anton Paar MCR301) under conditions of torsion mode, frequency 10 rad / s (1.6 Hz), strain setting 0.1%, and heating rate 2°C / min. The tan δ peak value was 2.70 and the tan δ peak temperature was 30°C.

[0132] The measurement results of each physical property are shown in Table 1.

[0133] [Table 1]

[0134] <Inorganic filler (B)> Heavy calcium carbonate (KS-1000: 50% average particle size 4.2 μm, manufactured by Calfine Co., Ltd.) was used as the inorganic filler (B-1).

[0135] <Inorganic filler (B-2)> Barium sulfate (Sakai Chemical Industry Co., Ltd., average particle size 10.0 μm) was used as the inorganic filler (B-2).

[0136] <Olefin-based thermoplastic elastomer (C1)> The following three types of olefin-based thermoplastic elastomers (C1) were used. (C1-1): TAFMER PN-2060 manufactured by Mitsui Chemicals, Inc. (Melt mass-flow rate (MFR; compliant with ASTM D1238, temperature 230°C, load 2.16 kg) 6 g / 10 min, density 868 kg / m 3 , melting point 160℃, surface hardness (ASTM D2244 compliant) Shore A84) (C1-2): Mitsui EPT3072EPM manufactured by Mitsui Chemicals, Inc. (Melt mass-flow rate (MFR; compliant with ASTM D1238, temperature 190°C, load 2.16 kg) 1.0 g / 10 min, density 880 kg / m 3 (No melting point observed) (C1-3): Mitsui Chemicals, Inc., Mitsui EPT K-9720M (Melt mass-flow rate (MFR; compliant with ASTM D1238, temperature 190°C, load 2.16 kg) 0.5 g / 10 min, density 870 kg / m 3 (No melting point observed) <Styrene-based thermoplastic elastomer (C2)> The following four types of styrene-based thermoplastic elastomer (C2) were used.

[0137] (C2-1): Tuftec H1052 manufactured by Asahi Kasei Corporation (Melt mass-flow rate (MFR; compliant with ASTM D1238, temperature 230°C, load 2.16 kgf) 13 g / 10 min, density 0.89 g / cm 3 , surface hardness (ASTM D2244 compliant) Shore A67), (C2-2): Tuftec H1272 (density 0.90 g / cm) manufactured by Asahi Kasei Corporation 3 , surface hardness (ASTM D2244 compliant) Shore A35, oil-extended composition), (C2-3): Kuraray Plastics Co., Ltd., Arneston CJ001N (Melt mass-flow rate (MFR; compliant with ASTM D1238, temperature 230°C, load 2.16 kgf) 2 g / 10 min, density 0.90 g / cm 3 , surface hardness (ASTM D2244 compliant) Shore A40), (C2-4): Kuraray Plastics Co., Ltd., Arneston JS20N (Melt mass-flow rate (MFR; compliant with ASTM D1238, temperature 190°C, load 2.16 kgf) 15 g / 10 min, density 0.89 g / cm3 , surface hardness (JIS K6253-3 compliant) Shore E20) (C2-5): SOE S1613 manufactured by Asahi Kasei Corporation (Melt Mass Flow Rate (MFR; ISO 1133 (Compliant, temperature 230℃, load 2.16kgf) 11.4g / 10 min, density 0.93g / cm 3 , surface hardness (ASTM D2244 compliant) Shore A46), For the olefin-based thermoplastic elastomer (C1) and the styrene-based thermoplastic elastomer (C2), the numerical values ​​immediately following the expressions "Shore A" and "Shore E" are the values ​​in Shore A hardness and Shore E hardness, respectively.

[0138] <Propylene-based resin (E)> As the propylene-based resin (E), a propylene homopolymer, J105G manufactured by Prime Polymer Co., Ltd. (melt mass-flow rate (MFR; based on ASTM D1238, temperature 230°C, load 2.16 kg) 9 g / 10 min, melting point 162°C) was used.

[0139] <Preparation of Resin Composition> The resin composition of the present invention was pelletized using a Banbury mixer (Kobe Steel, Ltd. BB-L1800: tangential four-blade rotor, kneading vessel volume 1.63 L) equipped with a single-screw extruder. Predetermined amounts of pre-dry-blended resin components were added to the Banbury mixer hopper and pushed into the mixing chamber by a floating weight. A predetermined amount of the inorganic filler (B) was then added through the hopper side plate. The mixture was melt-kneaded at a temperature setting of 220°C and a rotor rotation speed of 80 rpm. The kneaded product, still in the molten state, was fed into the single-screw extruder and granulated using a die (pelletizing head) with circular holes, a cooling water tank, and a pelletizer to obtain pellets of the resin composition. The resulting resin composition pellets were uniformly mixed and dispersed, with a diameter of 2.5 to 3.0 mm.

[0140] <Preparation of molded body> To evaluate the physical properties of molded articles based on the material composition of the resin composition, an injection molding machine (Toshiba Machine Co., Ltd. ES75SXIII; clamping force 735 kN, screw diameter Φ32 mm) was used to prepare square plates measuring 120 mm in length, 130 mm in width, and 2 mm in thickness, and dumbbells (dumbbell-shaped molded article test pieces) measuring 3 mm in thickness in accordance with ASTM D638 for measuring mechanical properties. The main molding conditions were as follows:

[0141] Cylinder temperature setting: 220~240℃ Screw rotation speed: 100 rpm Injection pressure: 30-40MPa ·Injection speed: 25~30mm / sec Mold temperature: 30-60°C (40°C for square plates) Cooling time: 30-60 seconds (40 seconds for square plates) Physical property evaluation of molded products <Measurement of dynamic viscoelasticity> Test pieces measuring 35 mm in length and 10 mm in width were punched out from the 2.0 mm thick molded body obtained by the above-mentioned method, and the tan δ peak temperature and tan δ peak value were observed over a temperature range of -40 to 150°C using a rheometer (Anton Paar MCR301) under the conditions of torsion mode, frequency of 10 rad / s (1.6 Hz), strain setting of 0.1%, and heating rate of 2°C / min.

[0142] <Density of molded body> Test pieces with dimensions of 62 mm length x 13 mm width were punched out from the 2 mm (2.0 mm) thick molded body (square plate) obtained by the above-mentioned method, and the density of the molded body (g / cm ) was measured by the underwater displacement method in accordance with JIS K7112. 3 ) was measured.

[0143] <Surface hardness> Three 2 mm (2.0 mm) thick molded bodies (square plates) obtained by the method described above were stacked to form test pieces, and the Shore A hardness was measured immediately after and 15 seconds after the indenter of a hardness tester was pressed against the surface of the test piece at 23°C in accordance with ASTM D2244. Normally, for Shore A 90 or higher, measurements are made using a Shore D hardness tester, but in order to understand the displacement over time due to the pressure of the indenter, measurements were made without changing the hardness tester even for Shore A 90 or higher.

[0144] Based on the obtained Shore A hardness values, the ΔHS value was calculated according to the following formula. ΔHS = (Shore A hardness value immediately after the start of indenter contact - Shore A hardness value 15 seconds after the start of indenter contact) <Mechanical properties> The tensile strength and tensile modulus of the molded body were measured by a tensile test using the dumbbell-shaped molded body test piece. Pull The test was carried out using a tension tester 2005X-5 in accordance with ASTM D638 at 23°C at a test speed of 50 mm / min.

[0145] <Molding shrinkage rate> The shrinkage rate was measured using the above-mentioned 2.0 mm thick molded body (square plate), Used in the injection molding The difference in length from the injection mold was measured for all four sides, and the dimensional change relative to the mold length was used for calculation.

[0146] [ reference Example 1 A resin composition containing 32 parts by mass of 4-methyl-1-pentene-α-olefin copolymer (A), 48 parts by mass of inorganic filler (B-1), and 20 parts by mass of olefin-based thermoplastic elastomer (C1) was melt-kneaded in the same manner as described above to obtain pellets.

[0147] The pellets were then used to prepare molded bodies and various test pieces in the same manner as described above, and the physical properties were evaluated as described above. The results are shown in Table 2-1. [ reference Example 2 The amounts of resin and inorganic filler (B-1) used were changed as shown in Table 2-1. reference Molded bodies and various test pieces were prepared and their physical properties were evaluated in the same manner as in Example 1. The results are shown in Table 2-1.

[0148] Example 3 Among the resins used, the olefin-based thermoplastic elastomer (C1) was changed to a styrene-based thermoplastic elastomer (C2-1). reference Molded bodies and various test pieces were prepared and their physical properties were evaluated in the same manner as in Example 1. The results are shown in Table 2-1.

[0149] Example 4 Among the resins used, the olefin-based thermoplastic elastomer (C1) was changed to a styrene-based thermoplastic elastomer (C2-2), reference Molded bodies and various test pieces were prepared and their physical properties were evaluated in the same manner as in Example 1. The results are shown in Table 2-1.

[0150] Example 5 Except for changing the blending amounts of the resin and inorganic filler (B-1) used as shown in Table 2-1, molded bodies and various test pieces were prepared in the same manner as in Example 4, and their physical properties were evaluated. The results are shown in Table 2-1.

[0151] Example 6 A resin composition containing 30 parts by mass of 4-methyl-1-pentene-α-olefin copolymer (A), 40 parts by mass of inorganic filler (B-1), and 30 parts by mass of styrene-based thermoplastic elastomer (C2-3) was melt-kneaded in the same manner as described above to obtain pellets.

[0152] The pellets were then used to prepare molded bodies and various test pieces in the same manner as described above, and the physical properties were evaluated as described above. The results are shown in Table 2-1. Example 7 Except for changing the blending amounts of the resin and inorganic filler (B-1) used as shown in Table 2-1, molded bodies and various test pieces were prepared in the same manner as in Example 6, and their physical properties were evaluated. The results are shown in Table 2-1.

[0153] Example 8 Except for changing the resin used from styrene-based thermoplastic elastomer (C2-3) to styrene-based thermoplastic elastomer (C2-4), molded bodies and various test pieces were prepared in the same manner as in Example 6, and their physical properties were evaluated. The results are shown in Table 2-2.

[0154] Example 9 Except for changing the blending amounts of the resin and inorganic filler (B-1) used as shown in Table 2-2, molded bodies and various test pieces were prepared in the same manner as in Example 8, and their physical properties were evaluated. The results are shown in Table 2-2.

[0155] Example 10 Except for changing the blending amounts of the resin and inorganic filler (B-1) used as shown in Table 2-2, molded bodies and various test pieces were prepared in the same manner as in Example 8, and their physical properties were evaluated. The results are shown in Table 2-2.

[0156] Example 11 A resin composition containing 40 parts by mass of 4-methyl-1-pentene-α-olefin copolymer (A), 30 parts by mass of inorganic filler (B-1), and 30 parts by mass of styrene-based thermoplastic elastomer (C2-5) was melt-kneaded in the same manner as described above to obtain pellets.

[0157] The pellets were then used to prepare molded bodies and various test pieces in the same manner as described above, and the physical properties were evaluated as described above. The results are shown in Table 2-2. Example 12 A resin composition containing 40 parts by mass of 4-methyl-1-pentene-α-olefin copolymer (A), 30 parts by mass of inorganic filler (B-2), and 30 parts by mass of styrene-based thermoplastic elastomer (C2-5) was melt-kneaded in the same manner as described above to obtain pellets.

[0158] The pellets were then used to prepare molded bodies and various test pieces in the same manner as described above, and the physical properties were evaluated as described above. The results are shown in Table 2-2. [ reference Example 13 A resin composition containing 50 parts by mass of 4-methyl-1-pentene-α-olefin copolymer (A), 40 parts by mass of inorganic filler (B-1), and 10 parts by mass of olefin-based thermoplastic elastomer (C1-2) was melt-kneaded in the same manner as described above to obtain pellets.

[0159] The pellets were then used to prepare molded bodies and various test pieces in the same manner as described above, and the physical properties were evaluated as described above. The results are shown in Table 2-2. [ reference Example 14 The amounts of resin and inorganic filler (B-1) used were changed as shown in Table 2-2. reference Molded bodies and various test pieces were prepared and their physical properties were evaluated in the same manner as in Example 13. The results are shown in Table 2-2.

[0160] [ reference Example 15 A resin composition containing 50 parts by mass of 4-methyl-1-pentene-α-olefin copolymer (A), 40 parts by mass of inorganic filler (B-1), and 10 parts by mass of olefin-based thermoplastic elastomer (C1-3) was melt-kneaded in the same manner as described above to obtain pellets.

[0161] The pellets were then used to prepare molded bodies and various test pieces in the same manner as described above, and the physical properties were evaluated as described above. The results are shown in Table 2-3. [ reference Example 16 The amounts of resin and inorganic filler (B-1) used were changed as shown in Table 2-3. reference In the same manner as in Example 15, molded bodies and various test pieces were prepared and their physical properties were evaluated. The results are shown in Table 2-3.

[0162] Comparative Example 1 The material composition of the resin composition was changed to 4-methyl-1-pentene·α-olefin copolymer (A) alone, reference Molded bodies and various test pieces were prepared and their physical properties were evaluated in the same manner as in Example 1. The results are shown in Table 2-3.

[0163] Comparative Example 2 A resin composition containing 30 parts by mass of the 4-methyl-1-pentene-α-olefin copolymer (A) and 70 parts by mass of the inorganic filler (B-1) was melt-kneaded in the same manner as described above to obtain pellets.

[0164] The pellets were then used to prepare molded bodies and various test pieces in the same manner as described above, and the physical properties were evaluated as described above. The results are shown in Table 2-3. Comparative Example 3 A resin composition containing 40 parts by mass of the 4-methyl-1-pentene-α-olefin copolymer (A) and 60 parts by mass of the propylene-based resin (E) was melt-kneaded in the same manner as described above to obtain pellets.

[0165] The pellets were then used to prepare molded bodies and various test pieces in the same manner as described above, and the physical properties were evaluated as described above. The results are shown in Table 2-3. Comparative Example 4 A resin composition containing 30 parts by mass of the 4-methyl-1-pentene-α-olefin copolymer (A) and 70 parts by mass of the inorganic filler (B-2) was melt-kneaded in the same manner as described above to obtain pellets.

[0166] The pellets were then used to prepare molded bodies and various test pieces in the same manner as described above, and the physical properties were evaluated as described above. The results are shown in Table 2-3.

[0167] [Table 2-1]

[0168] [Table 2-2]

[0169] [Table 2-3]

[0170] As shown in Tables 2-1 to 2-3, in the examples 3 to 12 and reference examples 1 ,2,13 The molded article made of the resin composition obtained in steps 1 to 16 has a tan δ peak temperature of 0°C to 60°C and a tan δ peak value of 0.6 to 5.0, as measured by dynamic viscoelasticity at a frequency of 10 rad / s (1.6 Hz) in a temperature range of -40 to 150°C. This means that the molded article has excellent stress relaxation properties in the room temperature range and slowly recovers to its original shape after elastic deformation. Furthermore, the molded article has a density of 1.0 g / cm 3 More than 5.0g / cm 3 Furthermore, the surface hardness was measured and it was found that the Hardness of and hardness after 15 seconds and Since the displacement is large, it can be said that the molded product has a soft feel. [Industrial Applicability]

[0171] The resin composition and molded article of the present invention can be suitably used as daily necessities, toys, and earplugs. Examples of daily necessities made from the resin composition of the present invention include containers for holding food, forks and spoons (particularly handles and grips for forks and spoons), tableware such as plates, containers with lids, and cosmetic compacts. Examples of toys include models such as plastic models. Examples of earplugs include hearing aid components and earphone components. Other examples include heat dissipation materials.

Claims

1. 15 to 50 parts by mass of a 4-methyl-1-pentene / α-olefin copolymer (A) satisfying at least one of the following requirements (d) and (e); 10 to 50 parts by mass of an inorganic filler (B); 5 to 49 parts by mass of a thermoplastic elastomer (C) (the total amount of the 4-methyl-1-pentene / α-olefin copolymer (A), the inorganic filler (B), and the thermoplastic elastomer (C) being 100 parts by mass); Including, the thermoplastic elastomer (C) is a styrene-based thermoplastic elastomer (C2) which is a block copolymer of a polystyrene block and a diene-based monomer block, and, A resin composition characterized by satisfying the following requirements (a) to (c): (a) The temperature at which the loss tangent tanδ value determined by dynamic viscoelasticity measurement at a frequency of 10 rad / s (1.6 Hz) in the temperature range of −40 to 150°C is maximized (hereinafter also referred to as the tanδ peak temperature) is 0°C or higher and 60°C or lower. (b) The maximum value of loss tangent tanδ (hereinafter also referred to as tanδ peak value) determined by dynamic viscoelasticity measurement at a frequency of 10 rad / s (1.6 Hz) in the temperature range of −40 to 150° C. is 0.6 or more and 5.0 or less. (c) Density is 1.0 g / cm 3 5.0g / cm or more 3 The following is the result. (d) Consists of 55 to 90 mol % of structural units derived from 4-methyl-1-pentene and 10 to 45 mol % of structural units derived from an α-olefin having 2 to 4 carbon atoms (the total of structural units derived from 4-methyl-1-pentene and structural units derived from an α-olefin having 2 to 4 carbon atoms is taken as 100 mol %). (e) The melting point measured by differential scanning calorimetry (DSC) is 160°C or less, or no melting point is observed.

2. 2. The resin composition according to claim 1, wherein the 4-methyl-1-pentene·α-olefin copolymer (A) satisfies the following requirements (f) and (g): (f) The tan δ peak temperature determined by dynamic viscoelasticity measurement at a frequency of 10 rad / s (1.6 Hz) in the temperature range of −40 to 150° C. is 15° C. or higher and 45° C. or lower. (g) The tan δ peak value determined by dynamic viscoelasticity measurement at a frequency of 10 rad / s (1.6 Hz) in the temperature range of −40 to 150° C. is 0.6 or more and 5.0 or less.

3. The resin composition according to any one of claims 1 to 2, wherein the inorganic filler (B) is at least one selected from the group consisting of calcium carbonate, magnesium sulfate, barium sulfate, magnesium oxide, and talc.

4. 4. The resin composition according to claim 1, wherein the inorganic filler (B) has an average particle size of 0.01 to 100 μm.

5. A molded article made of the resin composition according to any one of claims 1 to 4.

6. 5. Daily commodities comprising the resin composition according to claim 1.

7. A toy made from the resin composition according to any one of claims 1 to 4.

8. A sheet made of the resin composition according to any one of claims 1 to 4.

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