Resin composition and molding

Abstract

To provide a resin composition which is excellent in impact strength and flowability in melting, even if it contains a plurality of inorganic particles having a volume-based particle diameter of 7 μm or more.SOLUTION: A resin composition contains a thermoplastic resin (A), inorganic powder (B), and a polyolefin-based wax (C). A volume ratio of inorganic particles having a particle diameter of 7 μm or more in the inorganic powder (B) is 25 vol.% or more. A content of the polyolefin-based wax (C) is 0.1 pt.mass to 20 pts.mass with respect to 100 pts.mass of the thermoplastic resin (A).SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present disclosure relates to a resin composition and a molded article. [Background technology]

[0002] In recent years, there has been a growing demand for the effective utilization of volcanic ash, an unused resource in the region, from the perspective of effective resource utilization and environmental protection.

[0003] Patent Document 1 discloses a structure made of physical and chemical materials. The structure includes volcanic ash from an active volcano and a thermoplastic or thermosetting resin. The volcanic ash is erupted from an active volcano within the last 100 years. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2019-099947 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the structure disclosed in Patent Document 1, unless the particle size of the volcanic ash is small, it may be difficult to obtain practical physical properties (e.g., impact strength). Therefore, there is a demand for resin compositions that have excellent impact strength and melt fluidity, even if they contain multiple inorganic particles with a large volume-based particle size (hereinafter simply referred to as "particle size") (specifically, volume-based particle size: 7 μm or more). "Volume-based particle size" refers to the volume-based particle size measured by laser diffraction / scattering (in accordance with ISO 13320:2020).

[0006] The present disclosure has been made in view of the above circumstances. An object of one embodiment of the present disclosure is to provide a resin composition that is excellent in impact strength and fluidity when melted, even when the resin composition contains a plurality of inorganic particles having a particle size of 7 μm or more, and a molded article containing the resin composition. [Means for solving the problem]

[0007] The means for solving the above problems include the following embodiments. <1> The composition contains a thermoplastic resin (A), an inorganic powder (B), and a polyolefin wax (C), The volume ratio of inorganic particles having a particle diameter of 7 μm or more in the inorganic powder (B) is 25% by volume or more, A resin composition, wherein the content of the polyolefin wax (C) is 0.1 to 20 parts by mass relative to 100 parts by mass of the thermoplastic resin (A). <2> the content of the thermoplastic resin (A) is 10 parts by mass to 90 parts by mass, and the content of the inorganic powder (B) is 90 parts by mass to 10 parts by mass, relative to 100 parts by mass in total of the thermoplastic resin (A) and the inorganic powder (B); <1> The resin composition according to claim 1. <3> The thermoplastic resin (A) includes a polyolefin resin. <1> or <2> The resin composition according to claim 1. <4> The melt flow rate of the thermoplastic resin (A) measured in accordance with ASTM D1238E at 230°C under a load of 2.16 kg is 11 g / 10 min to 100 g / 10 min. <1> ~ <3> The resin composition according to any one of the above. <5> The above-mentioned composition further contains a modified polyolefin resin (D). <1> ~ <4> The resin composition according to any one of the above. <6> The above-mentioned composition further contains an olefin-based elastomer (E). <1> ~ <4> The resin composition according to any one of the above. <7> The above-mentioned composition further contains an olefin-based elastomer (E). <5> The resin composition according to claim 1. <8> The inorganic powder (B) contains a plurality of naturally occurring inorganic particles. <1> ~ <7> The resin composition according to any one of the above. <9> The inorganic powder (B) contains a plurality of mineral particles. <1> ~ <8> The resin composition according to any one of the above. <10> The inorganic powder (B) contains a plurality of oxide mineral particles. <1> ~ <9> The resin composition according to any one of the above. <11> The inorganic powder (B) contains a plurality of metal oxide particles. <1> ~ <10> The resin composition according to any one of the above. <12> The inorganic powder (B) contains a plurality of silica (SiO2) particles. <1> ~ <11> The resin composition according to any one of the above. <13> The inorganic powder (B) contains volcanic ash. <1> ~ <12> The resin composition according to any one of the above. <14> The aforementioned <1> ~ <13> A molded article comprising the resin composition according to any one of claims 1 to 4. [Effects of the Invention]

[0008] According to an embodiment of the present disclosure, a resin composition that is excellent in impact strength and fluidity when melted, even when containing a plurality of inorganic particles having a particle size of 7 μm or more, and a molded article containing the same are provided. DETAILED DESCRIPTION OF THE INVENTION

[0009] In the present disclosure, the symbol "to" indicating a range of values ​​is used to mean that the values ​​before and after it are included as the lower limit and upper limit. In the present disclosure, in the numerical ranges described in stages, the upper or lower limit value described in one numerical range may be replaced with the upper or lower limit value of another numerical range described in stages. In the numerical ranges described in the present disclosure, the upper or lower limit value of the numerical range may be replaced with the value shown in the examples. In the present disclosure, the term "process" includes not only an independent process but also a process that cannot be clearly distinguished from other processes as long as the intended purpose of the process is achieved. In the present disclosure, when referring to the amount of each component in a composition, if there are multiple substances corresponding to each component in the composition, it means the total amount of the multiple substances present in the composition, unless otherwise specified.

[0010] (1) Resin composition The resin composition of the present disclosure contains a thermoplastic resin (A), an inorganic powder (B), and a polyolefin wax (C). The volume fraction of particles having a particle size of 7 μm or more in the inorganic powder (B) (hereinafter also referred to as "volume fraction (7 μm or more)") is 25% by volume or more. The content of the polyolefin wax (C) is 0.1 to 20 parts by mass per 100 parts by mass of the thermoplastic resin (A).

[0011] The term "thermoplastic resin (A)" refers to a thermoplastic resin that does not fall under any of the polyolefin wax (C), modified olefin resin (D), and olefin elastomer (E).

[0012] "Inorganic powder (B)" refers to multiple inorganic particles. "Inorganic particles" refers to particles made of an inorganic substance. "Volume ratio of particles with a particle diameter of 7 μm or more in inorganic powder (B)" refers to the volume ratio of inorganic particles with a particle diameter of 7 μm or more to the total volume of inorganic powder (B) in the volume-based particle size cumulative distribution of inorganic powder (B). The volume-based particle size cumulative distribution is measured by laser diffraction / scattering method (in accordance with ISO 13320:2020).

[0013] "Polyolefin wax (C)" refers to an olefin resin having a polystyrene-equivalent number average molecular weight (Mn) of 5,000 or less as measured by gel permeation chromatography (GPC). Note that a polystyrene-equivalent number average molecular weight (Mn) of 5,000 or less is synonymous with a polyethylene-equivalent number average molecular weight (Mn) of 2,500 or less. The molecular weight in terms of polyethylene can be calculated by converting the molecular weight in terms of polystyrene using a general calibration method that uses the coefficients of the Mark-Houwink viscosity equation. The coefficients of the Mark-Houwink viscosity equation are as follows: Modulus of polystyrene (PS): KPS = 1.38 x 10 -4 , aPS=0.70 Coefficient of polyethylene (PE): KPE = 5.06 x 10 -4 , aPE=0.70

[0014] The "modified polyolefin resin (D)" is a polyolefin resin containing an unsaturated carboxylic acid in an amount of 0.005% by mass to 10% by mass, and does not fall under the category of the polyolefin wax (C).

[0015] "Olefin elastomer (E)" refers to an olefin resin having a tensile modulus of elasticity at 25°C of less than 600 MPa, and not corresponding to polyolefin wax (C) or modified polyolefin resin (D).

[0016] The resin composition of the present disclosure has the above-described configuration and is therefore excellent in impact strength and fluidity when melted, even when it contains a plurality of inorganic particles having a volume-based particle size of 7 μm or more.

[0017] In the present disclosure, when the inorganic powder (B) is a local unused resource (for example, volcanic ash), the unused resource can be effectively utilized with high efficiency by adding a large amount of the inorganic powder (B).

[0018] (1.1) Thermoplastic resin (A) The resin composition of the present disclosure contains a thermoplastic resin (A), which facilitates processing such as injection molding and extrusion molding, and also makes it recyclable by reheating.

[0019] (1.1.1) Material Examples of the thermoplastic resin (A) include olefin resins, acrylonitrile / butadiene / styrene copolymer resins (hereinafter also referred to as "ABS resins"), styrene resins, and polyesters.

[0020] Olefin resins are polymers whose main component is an α-olefin. Examples of α-olefins include ethylene, propylene, 1-butene, and 4-methyl-1-pentene. Olefin resins are homopolymers of α-olefins, copolymers of α-olefins with other α-olefins, or copolymers of α-olefins with monomers other than α-olefins.

[0021] The thermoplastic resin (A) preferably contains a polyolefin-based resin, which provides the resin composition with superior mechanical strength, waterproofness, moisture resistance, chemical resistance, etc., compared to a case where the thermoplastic resin (A) does not contain a polyolefin-based resin, and allows for mass production of a wide variety of products.

[0022] The olefin resin is preferably an ethylene polymer (A1), a propylene polymer (A2), a 1-butene polymer (A3), a 4-methyl-1-pentene polymer (A4), an ABS resin (A5), or a thermoplastic resin (A6) other than (A1) to (A5).

[0023] (1.1.1.1) Ethylene polymer (A1) The ethylene polymer (A1) is a polymer whose main component is a structural unit derived from ethylene. The ethylene polymer (A1) is an ethylene homopolymer or a copolymer of ethylene and an α-olefin having 3 to 20 carbon atoms. Examples of the ethylene homopolymer include high-density polyethylene (HDPE), medium-density polyethylene (MDPE), low-density polyethylene (LDPE), and linear low-density polyethylene (LLDPE). Examples of the α-olefin having 3 to 20 carbon atoms to be copolymerized with ethylene include propylene, 1-butene, 1-pentene, 1-hexene, 4-methyl-1-pentene, 1-octene, 1-decene, 1-dodecene, 1-tetradecene, 1-hexadecene, 1-octadecene, 1-eicosene, 2-methyl-1-butene, 3-methyl-1-butene, 3,3-dimethyl-1-butene, and 3,5,5-trimethyl-1-hexene. Among these, α-olefins having 3 to 10 carbon atoms are preferred, α-olefins having 3 to 8 carbon atoms are more preferred, and ethylene, 1-butene, 1-hexene, 4-methyl-1-pentene, or 1-octene are particularly preferred. The molar ratio of ethylene to α-olefin (ethylene / α-olefin) is preferably 99 / 1 to 60 / 40, more preferably 95 / 5 to 70 / 30, and even more preferably 90 / 10 to 60 / 25.

[0024] Examples of the ethylene-α-olefin copolymer include ethylene-propylene copolymer, ethylene-1-butene copolymer, ethylene-1-hexene copolymer, ethylene-4-methyl-1-pentene copolymer, ethylene-1-octene copolymer, ethylene-propylene-1-butene copolymer, and ethylene-propylene-1-octene copolymer. Among these, ethylene-propylene copolymer, ethylene-1-butene copolymer, ethylene-1-hexene copolymer, ethylene-4-methyl-1-pentene copolymer, and ethylene-propylene-1-octene copolymer are preferred, and ethylene-1-butene copolymer is more preferred. The density of the ethylene polymer (A1) is preferably 850 kg / m 3 ~980kg / m 3 , more preferably 855 kg / m 3 ~978kg / m 3 , and more preferably 860 kg / m 3 ~976kg / m 3 , particularly preferably 862 kg / m 3 ~973kg / m 3 The density is measured in accordance with JIS K7112.

[0025] When the resin composition of the present disclosure contains an ethylene-based polymer (A1), a molded article obtained from the resin composition has higher thermal conductivity, a better warm / cold sensation, and tends to emit a higher-pitched sound when struck than when the resin composition contains a propylene-based polymer (A2). The molded article can be suitably used for various applications without limitation. The molded article can be suitably used, for example, as a base material for surface modification by metal vapor deposition.

[0026] (1.1.1.2) Propylene polymer (A2) The propylene polymer (A2) is a polymer whose main component is a structural unit derived from propylene. Examples of the propylene polymer (A2) include a homopolymer of propylene (propylene homopolymer: homo PP), a copolymer of propylene with ethylene and / or an α-olefin having 4 to 20 carbon atoms (random copolymer: random PP), and a composition of a propylene homopolymer and an ethylene-propylene copolymer (block copolymer: block PP). Examples of the α-olefin in the propylene-α-olefin copolymer include ethylene, 1-butene, 1-pentene, 1-hexene, 4-methyl-1-pentene, 1-octene, 1-decene, 1-dodecene, 1-tetradecene, 1-hexadecene, 1-octadecene, 1-eicosene, 2-methyl-1-butene, 3-methyl-1-butene, 3,3-dimethyl-1-butene, 3-methyl-1-hexene, and 3,5,5-trimethyl-1-hexene. Among these, ethylene and α-olefins having 4 to 10 carbon atoms are preferred, and ethylene and α-olefins having 4 to 8 carbon atoms are more preferred, with ethylene, 1-butene, 1-hexene, 4-methyl-1-pentene, and 1-octene being even more preferred. The molar ratio of propylene to α-olefin (propylene / α-olefin) is preferably 99 / 1 to 60 / 40, more preferably 95 / 5 to 70 / 30, and even more preferably 90 / 10 to 70 / 30.

[0027] Examples of propylene-α-olefin copolymers (random PP) include propylene-ethylene copolymers, propylene-1-butene copolymers, propylene-1-hexene copolymers, propylene-4-methyl-1-pentene copolymers, propylene-1-octene copolymers, and propylene-ethylene-1-butene copolymers. Among these, propylene-ethylene copolymers and propylene-1-butene copolymers are preferred, and propylene-ethylene copolymers are particularly preferred.

[0028] When the thermoplastic resin (A) is a propylene homopolymer, the melting point of the thermoplastic resin (A) is preferably 155°C to 170°C, more preferably 158°C to 165°C. When the thermoplastic resin (A) is a propylene-ethylene random copolymer, the ethylene content of the propylene-ethylene random copolymer is preferably 1.9 to 5.4% by mass, more preferably 2.0 to 4.8% by mass. The crystalline melting point of the propylene-ethylene random copolymer is preferably 130 to 150°C, more preferably 130 to 145°C, and particularly preferably 135 to 145°C. The crystalline melting point is measured by a differential scanning calorimeter (DSC) in accordance with JIS K7121.

[0029] The density of the propylene polymer (A2) is preferably 850 kg / m 3 ~910kg / m 3 and more preferably 875 kg / m 3 ~909kg / m 3 and more preferably 890 kg / m 3 ~908kg / m 3 The density is measured according to JIS K7112. The propylene polymer (A2) may be a propylene polymer containing glass fibers. The density of the propylene polymer containing glass fibers is preferably 910 kg / m 3 ~1220kg / m 3 , more preferably 940 kg / m 3 ~1200kg / m 3 , and more preferably 970 kg / m 3 ~1160kg / m 3 , particularly preferably 1000 kg / m 3 ~1120kg / m 3 The density is measured according to JIS K7112.

[0030] The propylene-ethylene block copolymer and the propylene-ethylene random copolymer may be used singly or in combination of two or more copolymers, for example, to adjust the MFR. When the resin composition of the present disclosure contains a propylene-based polymer (A2), a molded article obtained from the resin composition can be suitably used in various applications without any restrictions. The molded article has a thermal conductivity close to that of ceramics and a specific gravity equivalent to that of ceramics, but is not prone to breaking when subjected to impacts such as being dropped, and is therefore highly safe. The molded article can be suitably used, for example, for items that are touched by hand (e.g., tableware (e.g., cups), containers, door handles, etc.).

[0031] (1.1.1.3) 1-butene polymer (A3) The 1-butene polymer (A3) is a polymer mainly composed of structural units derived from 1-butene. Examples of the 1-butene polymer (A3) include a homopolymer of 1-butene (polybutene) and a copolymer of 1-butene with ethylene, propylene, or an α-olefin having 5 to 20 carbon atoms (1-butene-α-olefin copolymer).

[0032] (1.1.1.4) 4-methyl-1-pentene polymer (A4) The 4-methyl-1-pentene polymer (A4) is a polymer mainly composed of structural units derived from 4-methyl-1-pentene. Examples of the 4-methyl-1-pentene polymer (A4) include a homopolymer of 4-methyl-1-pentene and a copolymer of 4-methyl-1-pentene and an α-olefin having 2 to 20 carbon atoms (excluding 4-methyl-1-pentene) (hereinafter also referred to as a "4-methyl-1-pentene-α-olefin copolymer").

[0033] The α-olefin in the 4-methyl-1-pentene-α-olefin copolymer may be a linear α-olefin having 2 to 20 carbon atoms (preferably 2 to 15 carbon atoms, more preferably 2 to 10 carbon atoms) or a branched α-olefin having 5 to 20 carbon atoms (preferably 5 to 15 carbon atoms). Examples of the linear α-olefin having 2 to 20 carbon atoms include ethylene, propylene, 1-butene, 1-pentene, 1-hexene, 1-octene, 1-decene, 1-undecene, 1-dodecene, 1-tetradecene, 1-hexadecene, 1-octadecene, and 1-eicosene. Examples of branched α-olefins having 5 to 20 carbon atoms include 3-methyl-1-butene, 3-methyl-1-pentene, 3-ethyl-1-pentene, 4,4-dimethyl-1-pentene, 4-methyl-1-hexene, 4,4-dimethyl-1-hexene, 4-ethyl-1-hexene, and 3-ethyl-1-hexene. Among these, ethylene, propylene, 1-butene, 1-pentene, 1-hexene, and 1-octene are preferred, and ethylene and propylene are particularly preferred. The α-olefin may be derived from one of these compounds or two or more of them. The molar ratio of 4-methyl-1-pentene to α-olefin (4-methyl-1-pentene / α-olefin) is preferably 55 / 45 to 90 / 10, more preferably 60 / 40 to 86 / 14, and even more preferably 68 / 32 to 85 / 15.

[0034] The temperature at which the loss tangent (tanδ) of the 4-methyl-1-pentene polymer (A4) reaches its peak value is 0° C. to 60° C., preferably 10° C. to 50° C., more preferably 20° C. to 45° C., and still more preferably 25° C. to 44° C. The temperature at which the loss tangent (tanδ) reaches its peak value is obtained by measuring the dynamic viscoelasticity in the temperature range of −40° C. to 150° C. at a frequency of 10 rad / s (1.6 Hz). The peak value of tan δ of the 4-methyl-1-pentene polymer (A4) is from 0.6 to 5.0, preferably from 0.7 to 4.5, and more preferably from 0.8 to 3.5.

[0035] Tan δ can be calculated as the ratio of the storage modulus (G') to the loss modulus (G") (G" / G': loss tangent) using the storage modulus (G') and loss modulus (G") obtained during dynamic viscoelasticity measurement.

[0036] In the present disclosure, the temperature at which tan δ reaches its peak value (maximum value) in the range of -40°C to 150°C is defined as the temperature at which tan δ reaches its peak value (hereinafter referred to as the "tan δ peak temperature"), and the value of tan δ at that time is defined as the peak value of tan δ (hereinafter referred to as the "tan δ peak value"). Note that this peak is thought to be due to the glass transition temperature of the 4-methyl-1-pentene polymer (A4).

[0037] The tan δ peak temperature of the 4-methyl-1-pentene polymer (A4) is preferably 15°C to 45°C or less. The tan δ peak temperature is obtained by performing dynamic viscoelasticity measurement in a temperature range of -40°C to 150°C at a frequency of 10 rad / s (1.6 Hz). The tan δ peak temperature is more preferably 20°C or higher, and even more preferably 25°C or higher. The tan δ peak temperature may be 40°C or lower, or may be higher than 40°C. The tan δ peak temperature is preferably 20°C to 45°C, and more preferably 25°C to 43°C. By setting the tan δ peak temperature within the above temperature range, the value of tan δ at room temperature can be further increased.

[0038] The tan δ peak value of the 4-methyl-1-pentene polymer (A4) is preferably 0.6 to 5.0, more preferably 1.0 to 4.8, even more preferably 1.3 to 4.5, and particularly preferably 1.8 to 4.0. The tan δ peak value is obtained by measuring dynamic viscoelasticity at a frequency of 10 rad / s (1.6 Hz) in a temperature range of -40°C to 150°C. By setting the tan δ peak value within the above range, it is possible to change the vibration absorption property, material hardness, and followability according to the rate of tension or deformation.

[0039] The melting point (Tm) of the 4-methyl-1-pentene polymer (A4) is preferably 160°C or lower or not observable, more preferably 140°C or lower or not observable, and even more preferably not observable. The melting point (Tm) is measured by a differential scanning calorimeter (DSC). By satisfying these requirements, the resin composition of the present disclosure can be easily kneaded with the inorganic powder (B), thereby improving vibration absorption and stress relaxation properties.

[0040] The 4-methyl-1-pentene polymer (A4) preferably has an intrinsic viscosity [η] of 0.1 dL / g to 5.0 dL / g, more preferably 0.5 dL / g to 4.0 dL / g, and even more preferably 0.5 dL / g to 3.5 dL / g. The intrinsic viscosity [η] is measured in decalin at 135°C. A 4-methyl-1-pentene polymer (A4) having the intrinsic viscosity [η] in the above range can be easily molded into a molded product.

[0041] The intrinsic viscosity [η] of the 4-methyl-1-pentene polymer (A4) can be adjusted to fall within the above range by adding hydrogen during production by polymerization to control the molecular weight and polymerization activity.

[0042] The intrinsic viscosity [η] can be determined by dissolving different amounts of thermoplastic resin compositions in decalin at 135°C, determining the viscosity increase rate ηsp (i.e., ηsp / c) per unit concentration c of each polymer, and extrapolating ηred so that the unit concentration c of the polymer is zero.

[0043] The 4-methyl-1-pentene polymer (A4) preferably has a ratio of weight average molecular weight (Mw) to number average molecular weight (Mn) (molecular weight distribution: Mw / Mn) of 1.0 to 3.5, more preferably 1.2 to 3.0, and even more preferably 1.5 to 2.8. Mw and Mn are each measured by gel permeation chromatography (GPC). A 4-methyl-1-pentene polymer (A4) having the Mw / Mn in the above range is less susceptible to deterioration in moldability due to a low molecular weight or low stereoregularity polymer, and is easy to mold.

[0044] The 4-methyl-1-pentene polymer (A4) has a weight average molecular weight (Mw) of preferably 500 to 10,000,000, more preferably 1,000 to 5,000,000, and even more preferably 1,000 to 2,500,000, in terms of polystyrene. The weight average molecular weight (Mw) is measured by gel permeation chromatography (GPC).

[0045] The Mw / Mn and Mw of the 4-methyl-1-pentene polymer (A4) can be adjusted to fall within the above ranges, for example, by using a metallocene catalyst. The above Mw and Mw / Mn can be determined, for example, by analyzing a chromatogram obtained by measurement using a Waters ALC / GPC 150-C plus model (integrated with a differential refractometer detector) liquid chromatograph, two Tosoh GMH6-HT columns and two Tosoh GMH6-HTL columns connected in series, o-dichlorobenzene as the mobile phase medium, at a flow rate of 1.0 ml / min and 140°C, using a calibration curve prepared using a standard polystyrene sample.

[0046] The density of the 4-methyl-1-pentene polymer (A4) is preferably 870 kg / m 3 ~830kg / m 3 , more preferably 865 kg / m 3 ~830kg / m 3 , more preferably 855 kg / m 3 ~830kg / m 3 The density is measured according to JIS K7112. The density can be appropriately changed by the comonomer composition ratio of the 4-methyl-1-pentene polymer (A4), and a polymer (A4) having a density within the above range is advantageous in producing a molded article.

[0047] When the resin composition of the present disclosure contains a 4-methyl-1-pentene polymer (A4), a molded article obtained from the resin composition can be suitably used for various applications without any restrictions. The molded article has superior flexibility and good heat conductivity compared to a resin composition containing a propylene polymer (A2), and therefore has properties such as being easily bendable when touched and easily retaining its shape at room temperature.

[0048] (1.1.1.5) ABS resin (A5) ABS resin (A5) is a resin containing not only acrylonitrile-butadiene-styrene copolymer, but also graft copolymers obtained by graft polymerizing a rubber component made from a monomer containing butadiene with a monomer containing aromatic vinyl or vinyl cyanide, or copolymers produced from the rubber component and other monomers copolymerizable with aromatic vinyl or vinyl cyanide. The rubber component is produced by a conventionally known method (solution polymerization, bulk polymerization, emulsion polymerization, etc.). The rubber and the graft polymer, or the copolymer with this rubber, can be produced by any of the conventionally known methods such as solution polymerization, bulk polymerization, or emulsion polymerization, and are readily available on the market.

[0049] Commercially available ABS resins (A5) include "Clarastic" manufactured by Nippon A&L Co., Ltd., "TECHNO ABS" or "UMG ABS" manufactured by Techno UMG Co., Ltd., "Toyolac" manufactured by Toray Industries, Inc., and "Denka ABS" manufactured by Denka Co., Ltd.

[0050] The density of the ABS resin (A5) (measured according to ISO 1183) is preferably 1000 kg / m 3 ~1070kg / m 3 , more preferably 1001 kg / m 3 ~1060kg / m 3 , more preferably 1002 kg / m 3 ~1050kg / m 3 is. The ABS resin (A5) may be used alone or in combination of two or more copolymers, for example, in order to adjust the MFR.

[0051] When the resin composition of the present disclosure contains an ABS resin (A5), a molded article obtained from the resin composition can be suitably used in various applications without limitation. The molded article tends to have superior impact resistance and high surface hardness compared to a resin composition containing a propylene-based polymer (A2). The molded article can be suitably used, for example, for trays that are likely to be scraped, kitchen countertops, desks, bathroom counters, door handles that require strength, and the like.

[0052] (1.1.1.6) Other thermoplastic resins (A6) Examples of the other thermoplastic resin (A6) include styrene-based resins (e.g., polystyrene), polyesters (e.g., polyethylene terephthalate), polyamides, and acrylic resins. The other thermoplastic resin (A6) can be produced by a known method or may be a commercially available product. The other thermoplastic resin (A6) may be used alone or in combination of two or more.

[0053] Among these thermoplastic resins (A), the olefin resins (A1) to (A4) or the ABS resin (A5) are preferred, and the ethylene polymer (A1), the propylene polymer (A2), the 4-methyl-1-pentene polymer (A4) or the ABS resin (A5) are more preferred. Two or more types of thermoplastic resins (A) may be used in combination.

[0054] (1.1.2)MFR The MFR (ASTM D1238, 230°C, 2.16 kg load) of the thermoplastic resin (A) is preferably 7 g / 10 min to 300 g / 10 min. The MFR is more preferably 11 g / 10 min or more, even more preferably 13 g / 10 min or more, particularly preferably 15 g / 10 min or more, and even more preferably 18 g / 10 min or more. The MFR is more preferably 200 g / 10 min or less, even more preferably 150 g / 10 min or less, and particularly preferably 100 g / 10 min or less. The thermoplastic resin (A) particularly preferably has an MFR (ASTM D1238, 230°C, 2.16 kg load) of 11 g / 10 min to 100 g / 10 min. This allows the resin composition to have better moldability, such as injection moldability, and the resulting molded article to have better mechanical properties than when the thermoplastic resin (A) has an MFR outside the range of 11 g / 10 min to 100 g / 10 min.

[0055] When the thermoplastic resin (A) is a 4-methyl-1-pentene polymer (A4), the MFR (ASTM D1238, 230°C, 2.16 kg load) is preferably 50 g / 10 min or less, more preferably 30 g / 10 min or less, even more preferably 15 g / 10 min or less, and particularly preferably 13 g / 10 min or less.

[0056] When the thermoplastic resin (A) is an ethylene polymer (A1), the MFR (ASTM D1238, 190°C, 2.16 kg load) is preferably 6 g / 10 min to 100 g / 10 min. The MFR is preferably 8 g / 10 min or more, more preferably 10 g / 10 min or more, and even more preferably 11 g / 10 min or more. The MFR is preferably 80 g / 10 min or less, more preferably 60 g / 10 min or less, and even more preferably 50 g / 10 min or less.

[0057] When the thermoplastic resin (A) is ABS resin (A5), the melt volume rate (hereinafter also referred to as "MVR") (ASTM D1133, 220°C, 10 kg load) is 10 cm 3 / 10 minutes~100cm 3 / 10 minutes. The MVR is preferably 18cm 3 / 10 minutes or more, preferably 30cm 3 / 10 minutes or more, preferably 40cm 3 / 10 minutes or more. MVR is preferably 95cm 3 / 10 minutes or less, preferably 90cm 3 / 10 minutes or less, preferably 85cm 3 / less than 10 minutes.

[0058] (1.1.3) Content The content of the thermoplastic resin (A) is not particularly limited. From the viewpoint of moldability and mechanical strength, the content of the thermoplastic resin (A) is preferably 5% by mass to 95% by mass, more preferably 10% by mass to 90% by mass, and even more preferably 15% by mass to 85% by mass, relative to the total amount of the resin composition. The content of the thermoplastic resin (A) may be 50% by mass to 85% by mass, or may be 60% by mass to 85% by mass, relative to the total amount of the resin composition.

[0059] (1.1.4) Raw Materials The thermoplastic resin (A) can be derived from any of fossil fuels, biomass, recycled materials, and chemically recycled materials. The thermoplastic resin (A) may be made from a combination of fossil fuel-derived and biomass-derived raw materials. The thermoplastic resin (A) may be made from a combination of fossil fuel-derived and material recycled raw materials. The thermoplastic resin (A) may be made from a combination of fossil fuel-derived and chemical recycled raw materials. The thermoplastic resin (A) may be made from a combination of biomass-derived and material recycled raw materials. The thermoplastic resin (A) may be made from a combination of biomass-derived and chemical recycled raw materials. The thermoplastic resin (A) may be made from a combination of material recycled and chemical recycled raw materials. The thermoplastic resin (A) may be made from a combination of fossil fuel-derived, biomass-derived and material recycled raw materials. The thermoplastic resin (A) may be made from a combination of fossil fuel-derived, biomass-derived and material recycled raw materials. The thermoplastic resin (A) may be made from a combination of fossil fuel-derived, biomass-derived and chemical recycled raw materials. The thermoplastic resin (A) may be made from a combination of fossil fuel-derived, material recycled and chemical recycled raw materials. The thermoplastic resin (A) may be made from a combination of biomass-derived, material recycled and chemical recycled raw materials. The thermoplastic resin (A) may be a mixture of fossil fuel-derived, biomass-derived, recycled material-derived, and chemically recycled raw materials.

[0060] The monomers constituting the thermoplastic resin (A) can be derived from any of fossil fuels, biomass, and chemically recycled materials. The raw material monomers for the thermoplastic resin (A) may be a combination of fossil fuel-derived and biomass-derived raw materials. The raw material monomers for the thermoplastic resin (A) may be a combination of fossil fuel-derived and chemically recycled raw materials. The raw material monomers for the thermoplastic resin (A) may be a combination of biomass-derived and chemically recycled raw materials. The raw material monomers for the thermoplastic resin (A) may be a combination of fossil fuel-derived, biomass-derived, and chemically recycled raw materials.

[0061] (1.2) Inorganic powder (B) The resin composition of the present disclosure contains inorganic powder (B). The inorganic powder (B) has a plurality of inorganic particles with a particle diameter of 7 μm or more.

[0062] The volume fraction of the inorganic powder (B) (7 μm or larger) is 25 vol% or larger. From the viewpoint of enabling effective utilization of a variety of unused resources through simple pretreatment, the volume fraction of the inorganic powder (B) (7 μm or larger) is preferably 27 vol% or larger, more preferably 29 vol% or larger, and even more preferably 31 vol% or larger. From the viewpoint of the mechanical properties of the resulting resin composition, the volume fraction of the inorganic powder (B) (7 μm or larger) may be 100 vol%, but is preferably 98 vol% or smaller, more preferably 96 vol% or smaller, even more preferably 94 vol% or smaller, particularly preferably 90 vol% or smaller, and even more preferably 86 vol% or smaller. From these viewpoints, the volume fraction of the inorganic powder (B) (7 μm or larger) may be 25 vol% to 100 vol%.

[0063] The average particle size of the inorganic powder (B) is not particularly limited, but from the viewpoint of handling, it is preferably 0.1 μm or more, more preferably 0.5 μm or more, and even more preferably 1 μm or more. It is particularly preferably 5 μm or more, and even more preferably 10 μm or less. From the viewpoint of the mechanical properties of the resulting resin composition, the average particle size of the inorganic powder (B) is preferably 500 μm or less, more preferably 400 μm or less, and even more preferably 300 μm or less. It is particularly preferably 100 μm or less, and even more preferably 50 μm or less. From these viewpoints, the average particle size of the inorganic powder (B) may be 0.1 μm to 500 μm. The "average particle size of inorganic powder (B)" refers to the particle size (D50, median diameter) corresponding to the cumulative 50% by volume from the fine particle side in the volume-based particle size distribution of inorganic powder (B). The volume-based particle size distribution is measured using a particle size distribution measuring device based on the laser light diffraction scattering method.

[0064] The inorganic powder (B) may be a mixture of an inorganic powder (b1) having a small average particle size and an inorganic powder (b2) having a large average particle size. This allows the metal oxide (b1) to fill the gaps between the metal oxides (b2), thereby increasing the packing density of the inorganic powder (B) in the resin composition. As a result, the physical properties (e.g., thermal conductivity) of the resin composition can be improved.

[0065] (1.2.1) Inorganic particles The inorganic powder (B) is an aggregate of a plurality of inorganic particles.

[0066] The shape of the inorganic particles is not particularly limited, and examples thereof include spherical, cubic, plate-like, columnar, hexagonal plate-like, irregular shapes, etc. The inorganic particles constituting the inorganic powder (B) are preferably spherical.

[0067] The inorganic particles constituting the inorganic powder (B) may be made of at least one type of material. Specifically, the inorganic powder (B) may be made of only inorganic particles made of the same material. The inorganic powder (B) may be a mixture of inorganic particles made of a first material and inorganic particles made of a second material different from the first material.

[0068] The inorganic particles may be naturally occurring inorganic particles or artificial inorganic particles.

[0069] The term "naturally occurring inorganic particles" refers to inorganic particles that fall into any of the following categories (i) to (iv): (i) Inorganic particles that originate from the Earth and have not been subjected to any chemical or other treatment. (ii) inorganic particles that have not undergone any processing, including changes in composition from those derived from Earth; (iii) Inorganic particles that have not undergone any processing, including chemical changes, since they were collected from the natural world as raw materials. (iv) Inorganic particles that have not undergone any processing that would alter their composition from that of the raw material collected from nature.

[0070] Examples of inorganic particles include volcanic ash, mineral particles, metal oxide particles, etc. These inorganic particles may be used alone, or two or more types of inorganic particles may be used in combination.

[0071] "Volcanic ash" refers to multiple inorganic particles in volcanic emissions that do not have a specific shape or internal structure. The diameter of the inorganic particles that make up volcanic ash is usually 2 mm or less. "Mineral particles" refers to inorganic particles made of minerals. "Mineral" refers to uniform inorganic substances that make up the Earth's crust. Minerals usually have a crystalline structure. "Metal oxide particles" refers to inorganic particles made of metal oxides.

[0072] The volcanic ash is not particularly limited, and may be volcanic ash collected in various locations. The volcanic ash may be volcanic ash collected from the Shirasu Plateau (volcanic glass deposits (secondary deposited Shirasu)) centered around Kagoshima. The volcanic ash may be volcanic ash collected from the Kanto Loam layer that spreads throughout the Kanto Plain. The volcanic ash may be volcanic ash collected from Mt. Showa-Shinzan in Hokkaido, etc. The volcanic ash may be used without any particular treatment, or may be calcined calcined volcanic ash.

[0073] The minerals constituting the mineral particles include silicate minerals, carbonate minerals, oxide minerals, and other minerals. The minerals may be natural minerals or artificial minerals. Examples of silicate minerals include nesosilicate minerals (e.g., magnesium silicate (Mg2SiO4), aluminum silicate (Al2SiO5), zinc silicate (Zn2SiO4), or zirconium silicate (ZrSiO4)), cyclosilicate minerals (e.g., calcium silicate (CaSiO3), etc.), layered silicate mineral particles (e.g., chrysotile, talc (Mg3SiO4), 10 (OH)2), montmorillonite ((Na,Ca) 0.33 (Al,Mg)2SiO 10 (OH)2·nH2O), or muscovite (KAl2(AlSi3)O 10 (OH)2), tectosilicate minerals (for example, quartz, feldspars, zeolites, or zeolites), asbestos (for example, chrysotile, amosite, or anthophinite), and the like. Carbonate minerals include, for example, dolomite (CaMg(CO3)2) or hydrotalcite (Mg6Al2(CO3)(OH)16 ·4(H2O)) etc. Examples of oxide minerals include spinel (MgAl2O4). Other minerals refer to minerals that are different from silicate minerals, carbonate minerals, and oxide minerals. Other minerals include strontium titanate (SrTiO3).

[0074] Examples of metal oxides that constitute the metal oxide particles include silica (SiO2), alumina, iron oxide, zirconia, titanium oxide, tin oxide, and niobium oxide.

[0075] The inorganic powder (B) preferably contains a plurality of naturally occurring inorganic particles. The content of the naturally occurring inorganic particles may be 5% by mass to 95% by mass, 10% by mass to 90% by mass, or 100% by mass, based on the total amount of the inorganic powder (B).

[0076] The inorganic powder (B) preferably contains a plurality of mineral particles. The content of the plurality of mineral particles may be 5% by mass to 95% by mass, 10% by mass to 90% by mass, or 100% by mass, based on the total amount of the inorganic powder (B).

[0077] The inorganic powder (B) preferably contains a plurality of mineral oxide particles. The content of the plurality of oxide mineral particles may be 5% by mass to 95% by mass, 10% by mass to 90% by mass, or 100% by mass, based on the total amount of the inorganic powder (B).

[0078] The inorganic powder (B) preferably contains a plurality of metal oxide particles. The content of the plurality of metal oxide particles may be 5% by mass to 95% by mass, 10% by mass to 90% by mass, or 100% by mass, based on the total amount of the inorganic powder (B).

[0079] The inorganic powder (B) preferably contains a plurality of silica (SiO2) particles. The content of the plurality of silica particles may be 5% by mass to 95% by mass, 10% by mass to 90% by mass, or 100% by mass, based on the total amount of the inorganic powder (B).

[0080] The inorganic powder (B) preferably contains volcanic ash. The content of the volcanic ash may be 5% by mass to 95% by mass, 10% by mass to 90% by mass, or 100% by mass, based on the total amount of the inorganic powder (B).

[0081] (1.2.2) Content The content of the inorganic powder (B) is not particularly limited. From the viewpoint of utilizing unused resources and the mechanical properties of the resulting resin composition, the content of the inorganic powder (B) is preferably 5% by mass to 80% by mass, more preferably 5% by mass to 75% by mass, even more preferably 10% by mass to 70% by mass, and particularly preferably 20% by mass to 60% by mass, relative to the total amount of the resin composition. The content of the inorganic powder (B) may be 46.5% by mass or more, 47.5% by mass or more, and 61.5% by mass or less, relative to the total amount of the resin composition.

[0082] It is preferable that the content of the thermoplastic resin (A) is 15 to 90 parts by mass and the content of the inorganic powder (B) is 10 to 85 parts by mass relative to a total of 100 parts by mass of the thermoplastic resin (A) and the inorganic powder (B). It is more preferable that the content of the thermoplastic resin (A) is 20 to 85 parts by mass and the content of the inorganic powder (B) is 15 to 80 parts by mass, relative to 100 parts by mass in total of the thermoplastic resin (A) and the inorganic powder (B). It is more preferable that the content of the thermoplastic resin (A) is 30 to 70 parts by mass and the content of the inorganic powder (B) is 30 to 70 parts by mass, relative to 100 parts by mass in total of the thermoplastic resin (A) and the inorganic powder (B).

[0083] The total content of the thermoplastic resin (A) and the inorganic powder (B) (hereinafter also referred to as the "total content") is not particularly limited, and is preferably 50% by mass to 100% by mass, more preferably 55% by mass to 99% by mass, and even more preferably 60% by mass to 98% by mass, based on the total amount of the resin composition.

[0084] (1.3) Polyolefin wax (C) The resin composition of the present disclosure contains a polyolefin wax (C), which is thought to suppress aggregation of the inorganic powder (B) in the resin composition, making it easier to knead a high content of the powder (B) into the resin composition.

[0085] (1.3.1) Material The polyolefin wax (C) refers to a wax made of polyolefin. The polyolefin wax (C) may be an unmodified polyolefin wax (C1) or a modified polyolefin wax (C2).

[0086] (1.3.1.1) Unmodified polyolefin wax (C1) The unmodified polyolefin wax (C1) is a low molecular weight polymer and is an unmodified wax made of polyolefin (e.g., polyethylene wax, polypropylene wax, etc.). As the unmodified polyolefin wax (C1), unmodified polyethylene wax (C11) or unmodified polypropylene wax (C12) is preferred, and unmodified polyethylene wax (C11) is more preferred.

[0087] The unmodified polyolefin wax (C1) is unmodified and has not been modified by oxidation or with an unsaturated carboxylic acid or the like. The acid value of the unmodified polyolefin wax (C1) is preferably 0.01 mgKOH / g or less, more preferably 0 mgKOH / g. The acid value is measured in accordance with JIS K0070.

[0088] The monomers constituting the unmodified polyolefin wax (C1) can be derived from any of fossil fuels, biomass and chemically recycled materials. As the raw material monomer for the unmodified polyolefin wax (C1), a raw material derived from a fossil fuel and a raw material derived from a biomass may be used in combination. Raw materials derived from fossil fuels and chemical recycling may be used in combination, Raw materials derived from biomass and chemical recycling may be used in combination, Raw materials derived from fossil fuels, biomass, and chemically recycled materials may be used in combination.

[0089] (1.3.1.1.1) Unmodified polyethylene wax (C11) The unmodified polyethylene wax (C11) is composed of an ethylene homopolymer or a copolymer of ethylene and an α-olefin. The α-olefin is preferably an α-olefin having 3 to 10 carbon atoms, more preferably an α-olefin having 3 to 8 carbon atoms, and even more preferably 1-butene. The unmodified polyethylene wax (C11) may be a polymer or copolymer containing ethylene-derived structural units as the main component (ethylene: 51 to 100 mol %).

[0090] The density of the unmodified polyethylene wax (C11) is preferably 890 kg / m 3 ~980kg / m 3 , more preferably 895 kg / m 3 ~975kg / m 3 When the density of the unmodified polyethylene wax (C11) is within this range, the dispersibility of the unmodified polyethylene wax (C11) in the resin composition is improved. The density is measured in accordance with the density gradient tube method of JIS K7112 (1999).

[0091] The unmodified polyethylene wax (C11) has a number average molecular weight (Mn) calculated as a standard polyethylene of preferably 700 to 4000, more preferably 1500 to 3800. The number average molecular weight (Mn) is measured by gel permeation chromatography.

[0092] The unmodified polyethylene wax (C11) having a number-average molecular weight (Mn) of 700 to 4000 can be appropriately dispersed in the thermoplastic resin (A) when preparing a resin composition, and also contributes to the dispersibility of the inorganic powder (B). The unmodified polyethylene wax (C11) having a number-average molecular weight (Mn) of 700 to 4000 can also reduce the extrusion load during molding and extrusion. As a result, the productivity of molded products can be further improved.

[0093] The unmodified polyethylene wax (C11) has a weight average molecular weight (Mw) in terms of standard polyethylene of preferably 1000 to 9000, more preferably 1500 to 8000, and even more preferably 2000 to 7000. The weight average molecular weight (Mw) is measured by gel permeation chromatography.

[0094] The melting point of the polyethylene wax is preferably 70° C. to 130° C., more preferably 80° C. to 129° C. The melting point is measured by a differential scanning calorimeter (DSC) in accordance with JIS K7121.

[0095] (1.3.1.1.2) Unmodified polypropylene wax (C12) The unmodified polypropylene wax (C12) is composed of a propylene homopolymer, or a copolymer of propylene with ethylene or an α-olefin. The α-olefin is preferably an α-olefin having 4 to 10 carbon atoms, more preferably an α-olefin having 4 to 8 carbon atoms, and even more preferably 1-butene. The unmodified polypropylene wax (C12) may be a polymer or copolymer containing a structural unit derived from propylene as the main component (propylene: content: 51 to 100 mol %).

[0096] (1.3.1.2) Modified polyolefin wax (C2) The modified polyolefin wax (C2) is a low molecular weight polymer, and is a modified wax made of polyolefin (e.g., polyethylene wax, polypropylene wax, etc.). The modified polyolefin wax (C2) is preferably a modified polyethylene wax (C21) or a modified polypropylene wax (C22), and more preferably a modified polyethylene wax (C21).

[0097] The modified polyolefin wax (C2) can be produced by a known method. For example, a method of adding an unsaturated carboxylic acid compound to a low-molecular-weight ethylene polymer using a radical reaction in the absence or presence of a solvent, a method of adding in the presence of a Lewis acid, or a method of adding at high temperature can be mentioned. The reaction temperature is 20°C to 300°C, preferably 120°C to 250°C. Since the melting point of the low-molecular-weight ethylene polymer is about 120°C, a reaction temperature of 120°C or higher is preferred in order to make the reaction system uniform.

[0098] The unsaturated carboxylic acid compound is a compound having a reactive double bond and a carboxylic acid group or a group that can be derived from the carboxylic acid group. Examples of the unsaturated carboxylic acid compound include known unsaturated carboxylic acids and their derivatives (e.g., anhydrides, esters, acid halides, amides, imides, etc.).

[0099] Examples of unsaturated carboxylic acids include unsaturated monocarboxylic acids and unsaturated dicarboxylic acids, such as acrylic acid, methacrylic acid, crotonic acid, and isocrotonic acid. Examples of unsaturated dicarboxylic acids include maleic acid, fumaric acid, tetrahydrophthalic acid, itaconic acid, citraconic acid, norbornene dicarboxylic acid, and Nadic Acid™ (endo-cis-bicyclo[2.2.1]hept-5-ene-2,3-dicarboxylic acid. By using an unsaturated carboxylic acid, a modified hydrocarbon resin having a carboxylic acid group (i.e., a modified polyolefin wax (C2)) can be obtained. As the anhydride of the unsaturated carboxylic acid, anhydrides of the above-mentioned unsaturated dicarboxylic acids can be used. Examples of the anhydride of the unsaturated carboxylic acid include maleic anhydride, itaconic anhydride, citraconic anhydride, tetrahydrophthalic anhydride, and Nadic Acid™ (endo-cis-bicyclo[2.2.1]hept-5-ene-2,3-dicarboxylic acid anhydride). By using an anhydride of the unsaturated carboxylic acid, a modified hydrocarbon resin having a carboxylic acid anhydride group (i.e., a modified polyolefin wax (C2)) can be obtained. Maleic anhydride is particularly preferred.

[0100] As the ester of unsaturated carboxylic acid, alkyl ester, hydroxyalkyl ester, or glycidyl ester of the above unsaturated carboxylic acid can be used. Examples of the ester of unsaturated carboxylic acid include monomethyl maleate, dimethyl maleate, glycidyl maleate, hydroxyl (meth)acrylate, hydroxypropyl (meth)acrylate, and glycidyl (meth)acrylate. By using the ester of unsaturated carboxylic acid, a modified hydrocarbon resin having a carboxylic acid ester group (i.e., a modified polyolefin wax (C2)) can be obtained.

[0101] Examples of halides of unsaturated carboxylic acids include malenyl chloride and dichloromaleic anhydride (C4Cl2O3). By using halides of unsaturated carboxylic acids, modified hydrocarbon resins having halogen atom-containing carboxylic acid groups (i.e., modified polyolefin wax (C2)) can be obtained. Examples of amides of unsaturated carboxylic acids include sulfamides, phthalamides, and maleamides. By using amides of unsaturated carboxylic acids, modified hydrocarbon resins having amide groups (i.e., modified polyolefin wax (C2)) can be obtained. Examples of imides of unsaturated carboxylic acids include maleimides, phthalimides, and sulfimides. By using imides of unsaturated carboxylic acids, modified hydrocarbon resins having imide groups (i.e., modified polyolefin wax (C2)) can be obtained.

[0102] The acid value of the modified polyolefin wax (C2) is preferably 1 mg-KOH / g to 100 mg-KOH / g, more preferably 10 mg-KOH / g to 90 mg-KOH / g.

[0103] The modified polyolefin wax (C2) preferably has a polystyrene-equivalent number average molecular weight (Mn) of 400 to 5000. The number average molecular weight (Mn) is measured by gel permeation chromatography (GPC).

[0104] (1.3.2) Content The content of the polyolefin wax (C) is not particularly limited. From the viewpoint of improving the dispersibility of the inorganic powder (B), the content of the polyolefin wax (C) is preferably 0.1 to 20% by mass, more preferably 0.2 to 15% by mass, and even more preferably 0.3 to 12% by mass, relative to the total amount of the resin composition. The content of the polyolefin wax (C) may be 5.0% by mass or less, 2.0% by mass or less, or 1.0% by mass or less, relative to the total amount of the resin composition.

[0105] (1.4) Modified polyolefin resin (D) The resin composition of the present disclosure preferably further contains a modified polyolefin resin (D). The modified propylene polymer (D) improves the compatibility and adhesion between the thermoplastic resin (A) and the inorganic powder (B). By improving the compatibility between them, the modified polyolefin resin (D) makes it easier to finely disperse the inorganic powder (B), thereby improving the processability, heat resistance, mechanical strength, and appearance of the molded article.

[0106] (1.4.1) Material The modified polyolefin resin (D) is, for example, a resin obtained by modifying an olefin resin (d1) with one or more components (d2) selected from unsaturated carboxylic acids and their derivatives. The modified polyolefin resin (D) is preferably a modified ethylene polymer (D1) or a modified propylene resin (D2).

[0107] The modified propylene polymer (D) can be obtained by modifying an unmodified propylene polymer by a known method.

[0108] In the modified ethylene polymer (D1), examples of the olefin resin (d1) include those exemplified as the ethylene polymer (A1). In the modified propylene polymer (D2), examples of the olefin resin (d1) include those exemplified as the propylene polymer (A2).

[0109] The unsaturated carboxylic acid constituting component (d2) may be an unsaturated compound having one or more carboxylic acid groups (unsaturated carboxylic acid in the narrow sense) or a derivative of an unsaturated carboxylic acid. Examples of the derivative of an unsaturated carboxylic acid constituting component (d2) include esters of unsaturated carboxylic acids and alkyl alcohols, and unsaturated compounds having carboxylic anhydrides (e.g., anhydrides of unsaturated carboxylic acids). The unsaturated groups contained in these unsaturated carboxylic acids include vinyl groups, vinylene groups, and unsaturated cyclic hydrocarbon groups. Examples of unsaturated carboxylic acids in the narrow sense include acrylic acid, methacrylic acid, maleic acid, fumaric acid, tetrahydrophthalic acid, itaconic acid, citraconic acid, crotonic acid, nadic acid, and endo-cis-bicyclo[2,2,1]hept-5-ene-23-dicarboxylic acid. Examples of derivatives of unsaturated carboxylic acids include acid anhydrides (e.g., maleic anhydride or citraconic anhydride), or acid halides, amidates, imides, or esters of (narrowly defined) unsaturated carboxylic acids (e.g., malenyl chloride, malenylimide, monomethyl maleate, or dimethyl maleate). The unsaturated carboxylic acid is preferably maleic acid, nadic acid, or an acid anhydride thereof, and more preferably maleic anhydride. These unsaturated carboxylic acids may be used alone or in combination of two or more.

[0110] When the olefin resin (d1) is modified with the unsaturated carboxylic acid, an organic peroxide is usually used as a radical initiator. Examples of the organic peroxide include di-n-propyl peroxydicarbonate, diisopropyl peroxydicarbonate, di-sec-butyl peroxydicarbonate, t-hexyl peroxyneodecanoate, t-butyl peroxyneodecanoate, t-amyl peroxyneodecanoate, t-butyl peroxyneoheptanoate, t-hexyl peroxypivalate, t-butyl peroxypivalate, t-amyl peroxypivalate, t-hexyl peroxy-2-ethylhex ...hexyl peroxy-2-ethylhexanoate, -butylperoxy-2-ethylhexanoate, t-amylperoxy-2-ethylhexanoate, t-butylperoxyisobutyrate, 1,1-di(t-butylperoxy)-2-methylcyclohexane, 1,1-di(t-hexylperoxy)-3,3,5-trimethylcyclohexane, 1,1-di(t-hexylperoxy)cyclohexane, 1,1-di(t-butylperoxy)cyclohexane, 1,1-di(t-amylperoxy)cyclohexane, 2,2-di(4,4-di-(t-butylperoxy)cyclohexane) (-oxy)cyclohexyl)propane, t-amylperoxyisononanoate, t-hexylperoxyisopropyl monocarbonate, t-amylperoxynormal octoate, t-butylperoxymaleic acid, t-butylperoxy-3,5,5-trimethylhexanoate, t-butylperoxylaurate, t-amylperoxyisopropyl monocarbonate, t-butylperoxyisopropyl monocarbonate, t-amylperoxy-2-ethylhexyl monocarbonate, t-butyl peroxy-2-ethylhexyl monocarbonate, t-hexyl peroxybenzoate, t-butyl peroxyacetate, t-amyl peroxyacetate, 2,2-di-(t-butylperoxy)butane, t-butyl peroxyisononanoate, t-amyl peroxybenzoate, t-butyl peroxybenzoate, n-butyl-4,4-di-(t-butylperoxy)valerate, methyl ethyl ketone peroxide, di(2-t-butylperoxyisopropyl)benzene, ethyl-3,Examples of the peroxyl groups include 3-di(t-butylperoxy)butyrate, di-t-hexyl peroxide, 1,3-di(2-t-butylperoxyisopropyl)benzene, 2,5-dimethyl-2,5-di-(t-butylperoxy)hexane, t-butylcumyl peroxide, di-t-amyl peroxide, di-t-butyl peroxide, 2,5-dimethyl-2,5-di-(t-butylperoxy)hexyne-3, t-amyl hydroperoxide, t-butyl hydroperoxide, 1,1-bis(t-butylperoxy)-3,3,5-trimethylcyclohexane, and 1,1-di(t-butylperoxy)-3,3,5-trimethylcyclohexane. Among these, 2,5-dimethyl-2,5-di-(t-butylperoxy)hexane, di-t-butyl peroxide, t-butylperoxyisopropyl monocarbonate, 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexyne-3, dicumyl peroxide, and t-butyl peroxybenzoate are preferred. These organic peroxide acids may be used alone or in combination of two or more.

[0111] The amount of organic peroxide used during modification is preferably 0.01 to 30 parts by mass, more preferably 1 to 20 parts by mass, and even more preferably 2 to 15 parts by mass, per 100 parts by mass of the olefin resin (d1).

[0112] The amount of unsaturated carboxylic acid contained in the modified propylene polymer (D) is preferably 0.005% by mass to 10% by mass, more preferably 0.01% by mass to 5% by mass, and even more preferably 0.02% by mass to 3% by mass, based on the total mass of the modified propylene polymer (D).

[0113] The density of the modified propylene polymer (D) is preferably 860 kg / m 3 ~930kg / m 3 , more preferably 880 kg / m 3 ~925kg / m 3 , and more preferably 890 kg / m 3 ~920kg / m 3The density is measured according to JIS K7112.

[0114] The modified propylene polymer (D) preferably has a polystyrene-equivalent number-average molecular weight (Mn) of more than 5,000 but not more than 60,000, more preferably 7,000 to 50,000, and even more preferably 10,000 to 45,000. A modified propylene polymer (D) having a number-average molecular weight (Mn) within the above range can improve the dispersibility of the inorganic powder (B) in the resin composition, and can further improve the appearance, heat resistance, and mechanical strength of a molded product. The processability and kneadability of the resin composition are also improved. The number-average molecular weight (Mn) is measured by gel permeation chromatography (GPC).

[0115] (1.4.2) Content The content of the modified propylene polymer (D) is not particularly limited. From the viewpoint of improving the compatibility and adhesion between the thermoplastic resin (A) and the inorganic powder (B), the content of the modified propylene polymer (D) is preferably 0.1 to 20% by mass, more preferably 0.2 to 15% by mass, and even more preferably 0.3 to 12% by mass, based on the total amount of the resin composition. The content of the modified propylene polymer (D) may be 5.0% by mass or less, or may be 2.0% by mass or less, based on the total amount of the resin composition.

[0116] (1.4.3) Raw Materials The modified propylene copolymer (D) can be any of those derived from fossil fuels, biomass, material recycling, and chemical recycling. The modified propylene copolymer (D) may be a combination of fossil fuel-derived and biomass-derived raw materials. The modified propylene copolymer (D) may be a combination of fossil fuel-derived and material recycling-derived raw materials. The modified propylene copolymer (D) may be a combination of fossil fuel-derived and chemical recycling-derived raw materials. The modified propylene copolymer (D) may be a combination of biomass-derived and material recycling-derived raw materials. The modified propylene copolymer (D) may be a combination of biomass-derived and chemical recycling-derived raw materials. The modified propylene copolymer (D) may be a combination of material recycling-derived and chemical recycling-derived raw materials. The modified propylene copolymer (D) may be a combination of fossil fuel-derived, biomass-derived and material recycling-derived raw materials. The modified propylene copolymer (D) may be a combination of fossil fuel-derived, biomass-derived and material recycling-derived raw materials. The modified propylene copolymer (D) may be a combination of fossil fuel-derived, biomass-derived and material recycling-derived raw materials. The modified propylene copolymer (D) may be a combination of raw materials derived from fossil fuels, recycled materials, and chemically recycled materials.The modified propylene copolymer (D) may be a combination of raw materials derived from biomass, recycled materials, and chemically recycled materials.The modified propylene copolymer (D) may be a combination of raw materials derived from fossil fuels, biomass, recycled materials, and chemically recycled materials.

[0117] The monomers constituting the modified propylene copolymer (D) can be derived from any of fossil fuels, biomass and chemically recycled materials. The raw material monomers for the modified propylene copolymer (D) may be a combination of fossil fuel-derived and biomass-derived raw materials. The monomers constituting the modified propylene copolymer (D) may be a combination of fossil fuel-derived and chemically recycled raw materials. The monomers constituting the modified propylene copolymer (D) may be a combination of biomass-derived and chemically recycled raw materials. The monomers constituting the modified propylene copolymer (D) may be a combination of fossil fuel-derived, biomass-derived and chemically recycled raw materials.

[0118] (1.5) Olefin elastomer (E) The resin composition of the present disclosure preferably further contains an olefinic elastomer (E), which compensates for the embrittlement caused by the inclusion of the inorganic powder (B) and allows the resin composition to maintain toughness, compared to when the resin composition does not contain the olefinic elastomer (E).

[0119] The olefin elastomer (E) is not particularly limited in terms of the type of olefin that serves as a constituent monomer, and may be any of those generally used as olefin elastomers.

[0120] The olefin-based elastomer (E) preferably contains at least one selected from the group consisting of ethylene-based elastomers and propylene-based elastomers, and more preferably contains a propylene-based elastomer.

[0121] The olefin-based elastomer (E) may be a copolymer (E1). The copolymer (E1) is a copolymer (E1) of one or more olefins selected from the group consisting of ethylene and propylene with other olefins. In the present disclosure, a copolymer in which ethylene is selected is referred to as an ethylene-based elastomer, and a copolymer in which propylene is selected is referred to as a propylene-based elastomer.

[0122] The olefin-based elastomer (E) may be a copolymer (E2). The copolymer (E2) is a copolymer of a first copolymer portion and a second copolymer portion. The first copolymer portion is made of one selected from the group consisting of polyethylene and polypropylene. The second copolymer portion is made of one selected from the group consisting of polybutadiene, hydrogenated polybutadiene, polyisoprene, hydrogenated polyisoprene, polyisobutylene, and α-olefin. The copolymer (E2) may be a copolymer of a first copolymer portion consisting of one selected from the group consisting of polyethylene and polypropylene and a second copolymer portion consisting of a poly-α-olefin. The copolymerization form of the first copolymer portion and the second copolymer portion may be either block copolymerization or graft copolymerization.

[0123] The olefin elastomer (E) may be a random copolymer (E3). The random copolymer (E3) is a random copolymer consisting of one or more members selected from the group consisting of ethylene and propylene and an α-olefin (excluding ethylene and propylene).

[0124] The olefin elastomer (E) may be a block copolymer (E4). The block copolymer (E4) is a block copolymer of a polyolefin block that forms a highly crystalline polymer (e.g., polypropylene) that serves as the hard portion and an amorphous monomer copolymer that serves as the soft portion. Examples of the block copolymer (E4) include an olefin (crystalline)-ethylene-butylene-olefin block copolymer and a polypropylene-polyolefin (amorphous)-polypropylene block copolymer. The block copolymer (E4) may be a commercially available product. Examples of commercially available block copolymers (E4) include "DYNARON (registered trademark)" manufactured by JSR Corporation, "TAFMER (registered trademark)" and "NOTIO (registered trademark)" manufactured by Mitsui Chemicals, Inc., "ENGAGE (registered trademark)" and "VERSIFY (registered trademark)" manufactured by Dow Chemical Company, and "Vistamaxx (registered trademark)" manufactured by ExxonMobil Chemical Corporation.

[0125] The olefinic elastomer (E) may be a blend (E5). The blend (E5) comprises one selected from the group consisting of polyethylene and polypropylene and one selected from the group consisting of ethylene-propylene copolymer, ethylene-propylene-diene copolymer, ethylene-butene copolymer, and hydrogenated styrene-butadiene copolymer. The ethylene-propylene copolymer, ethylene-propylene-diene copolymer, and ethylene-butene copolymer may be partially or completely crosslinked. The blend (E5) may be a commercially available product, such as "Milastomer (registered trademark)" manufactured by Mitsui Chemicals, Inc., "Esporex (registered trademark)" manufactured by Sumitomo Chemical Co., Ltd., "Thermorun (registered trademark)" and "Zelas (registered trademark)" manufactured by Mitsubishi Chemical Corporation, or "Santoplene (registered trademark)" manufactured by ExxonMobil Chemical Corporation.

[0126] The olefinic elastomer (E) may be an unmodified olefinic elastomer or a modified olefinic elastomer obtained by modifying an olefinic elastomer with a specific functional group, which is at least one 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.

[0127] The melting point (Tm) of the olefin elastomer (E) is either not observed or is between 50°C and 162°C. The melting point (Tm) is measured by a differential scanning calorimeter (DSC). By satisfying this requirement, deformation during heating can be suppressed. "No melting point (Tm) is observed" means that the heat of fusion (ΔH) (unit: J / g) measured by differential scanning calorimetry (DSC) is substantially not measured. "No heat of fusion (ΔH) is substantially not measured" means that no peak is observed in differential scanning calorimetry (DSC) measurement, or the observed heat of fusion is 1 J / g or less. The melting point (Tm) of the olefin elastomer (E) is a value measured in accordance with JIS K7121 using the same method as used to measure the melting point (Tm) of polypropylene.

[0128] When a propylene elastomer is used as the olefin elastomer (E), the olefin elastomer (E) preferably contains 50 mol % or more and less than 90 mol % of structural units derived from propylene. When an ethylene-based elastomer is used as the propylene-based elastomer, the ethylene-based elastomer preferably contains 50 mol % or more but less than 90 mol % of structural units derived from ethylene. Here, "structural units derived from ethylene" refers to structural units represented by -CH2-CH2-.

[0129] The olefinic elastomer (E) has a tensile modulus of 600 MPa or less, preferably 1 MPa to 500 MPa. The tensile modulus is more preferably 1 MPa or more to less than 200 MPa, even more preferably 1 MPa to 100 MPa, particularly preferably 1 MPa to 50 MPa, and even more preferably 1 MPa to 40 MPa. The tensile modulus is measured in accordance with JIS K7161. The nominal tensile strain at break of the olefinic elastomer (E) preferably exceeds 1000%. The nominal tensile strain at break is measured in accordance with JIS K7161.

[0130] (1.5.1) Content The content of the olefin elastomer (E) is not particularly limited. From the viewpoint of improving the mechanical properties of the resulting resin composition, the content of the olefin elastomer (E) is preferably 0.1 to 30% by mass, more preferably 0.2 to 25% by mass, and even more preferably 0.3 to 20% by mass, relative to the total amount of the resin composition. The content of the olefin elastomer (E) may be 10.0% by mass or less, 5.0% by mass or less, or 3.0% by mass or less, relative to the total amount of the resin composition.

[0131] (1.5.2) Raw Materials The olefin-based elastomer (E) can be derived from any of fossil fuels, biomass, material recycling, and chemical recycling. The olefin-based elastomer (E) may be a combination of fossil fuel-derived and biomass-derived raw materials. The olefin-based elastomer (E) may be a combination of fossil fuel-derived and material recycling-derived raw materials. The olefin-based elastomer (E) may be a combination of fossil fuel-derived and chemical recycling-derived raw materials. The olefin-based elastomer (E) may be a combination of biomass-derived and material recycling-derived raw materials. The olefin-based elastomer (E) may be a combination of biomass-derived and chemical recycling-derived raw materials. The olefin-based elastomer (E) may be a combination of material recycling-derived and chemical recycling-derived raw materials. The olefin-based elastomer (E) may be a combination of fossil fuel-derived, biomass-derived, and material recycling-derived raw materials. The olefin-based elastomer (E) may be a combination of fossil fuel-derived, biomass-derived, and material recycling-derived raw materials. The olefin-based elastomer (E) may be a combination of fossil fuel-derived, biomass-derived, and material recycling-derived raw materials. The olefin-based elastomer (E) may be a combination of raw materials derived from fossil fuels, recycled materials, and chemically recycled materials.The olefin-based elastomer (E) may be a combination of raw materials derived from biomass, recycled materials, and chemically recycled materials.The olefin-based elastomer (E) may be a combination of raw materials derived from fossil fuels, biomass, recycled materials, and chemically recycled materials.

[0132] The monomers constituting the olefinic elastomer (E) can be derived from any of fossil fuels, biomass, and chemically recycled materials. The raw material monomers for the olefinic elastomer (E) may be a combination of fossil fuel-derived and biomass-derived raw materials. The monomers constituting the olefinic elastomer (E) may be a combination of fossil fuel-derived and chemically recycled raw materials. The monomers constituting the olefinic elastomer (E) may be a combination of biomass-derived and chemically recycled raw materials. The monomers constituting the olefinic elastomer (E) may be a combination of fossil fuel-derived, biomass-derived, and chemically recycled raw materials.

[0133] (1.5.2) Preferred embodiment The resin composition of the present disclosure preferably further contains an olefinic elastomer (E) in addition to the thermoplastic resin (A), inorganic powder (B), polyolefin wax (C), and modified polyolefin resin (D), thereby compensating for embrittlement caused by the inclusion of the inorganic powder (B) and maintaining toughness.

[0134] When the resin composition of the present disclosure contains a thermoplastic resin (A), an inorganic powder (B), a polyolefin wax (C), a modified polyolefin resin (D), and an olefin elastomer (E), the content of the olefin elastomer (E) is not particularly limited. From the viewpoint of improving physical properties, the content of the olefin elastomer (E) is preferably 0.1 to 20% by mass, more preferably 0.2 to 15% by mass, and even more preferably 0.3 to 12% by mass, based on the total amount of the resin composition.

[0135] (1.7) Additives The resin composition of the present disclosure may contain known additives depending on the application, as long as the additives do not impair the object of the present disclosure. Examples of the additives include plasticizers, lubricants, antioxidants, UV absorbers, heat stabilizers, pigments, pigment masterbatches, dyes, antistatic agents, flame retardants, coupling agents, dispersants, etc.

[0136] (1.8) Method for producing resin composition The resin composition of the present disclosure can be obtained by melt-kneading the above components using a mixer (e.g., a dry blend, a Henschel mixer, a Banbury mixer, or a kneader) or an extruder (e.g., a single-screw extruder, a twin-screw extruder, or a high-speed twin-screw extruder).

[0137] (2) Molded body The molded article of the present disclosure includes the resin composition of the present disclosure.

[0138] The molded article of the present disclosure has the above-described configuration and therefore has excellent impact strength even when it contains a plurality of particles having a particle diameter of 7 μm or more.

[0139] The resin composition of the present disclosure has excellent moldability and can be used in a variety of molding methods, including injection-molded products, foam-molded products, injection-foam-molded products, extrusion-molded products, blow-molded products, vacuum-pressure-molded products, calendar-molded products, three-dimensional laminate-molded products, microwave-molded products, stretched films, and inflation films.

[0140] Specific examples include containers for food, tableware (e.g., forks, knives, spoons, plates, teapots, teacups, etc.), sake vessels (e.g., tokkuri or Choshijima), and cutlery rests (e.g., chopstick rests, etc.). These are very useful as alternatives to ceramics because they can be easily molded by injection molding, they allow you to easily feel the warmth or coldness of the contents, and they have a sense of weight. They can also be expanded to other uses for ceramics, such as everyday items (e.g., lampshades or vases), speaker housings and structural materials, plumbing products (e.g., washbasins or toilets), and vases and pots for holding plants. In addition to applications using ceramics, the resin composition can be used in a variety of applications, including models and toys (e.g., plastic models, etc.), furniture (e.g., desks or chairs, etc.), home appliances (e.g., refrigerators, rice cookers, vacuum cleaners, etc.), musical instruments (e.g., piano keys, etc.), construction (e.g., tiles, artificial marble substitutes, building materials, etc.), and clothing (e.g., buttons, etc.). Taking advantage of its warm / cool sensation and moldability, the resin composition of the present disclosure may also be suitable as a filament for 3D printers.

[0141] The molded article of the present disclosure is preferably used in applications that take advantage of its design, stability, antibacterial properties, tactile feel, etc. Examples of the molded article of the present disclosure include containers (e.g., bottles or jars), steering wheels for vehicles and ships, shift knobs, door handles, door knobs, various switches, handrails, mice, keyboards, controllers, remote controls, decorative accessories, stationery (e.g., mechanical pencils, ballpoint pens, fountain pens, etc.), smartphone covers, tablet covers, PC, tablet, and smartphone housings, various home appliance housings, beauty appliance housings, household appliance housings, power storage devices (e.g., battery cases, etc.), book covers, wallpaper, wall materials, flooring materials, building materials, toilets, and toiletry products. The molded article of the present disclosure can be suitably used in places that are touched by hands on a daily basis.

[0142] Suitable examples of containers include those for beauty-related products such as cosmetics (lotion liquid, cosmetic cream, etc.), shampoo (including body shampoo), conditioner, etc., where these performances tend to have a large impact on the product value. More specifically, examples include containers with lids (including airless containers), (cosmetic) compacts, (cosmetic) palettes, bottles, etc.

[0143] In recent years, plastic containers such as polyolefin, which are lightweight and have excellent impact resistance, have been used for most of these applications, but these materials are not suitable for creating a luxurious feel visually or tactilely (including thermal conductivity, weight, etc.) Containers such as ceramics are suitable for creating a luxurious feel, but these have major problems such as limited freedom in terms of design and mass production, as well as low impact resistance.

[0144] The containers disclosed herein can be molded using the same molding methods as conventional plastic products, and therefore not only have excellent productivity and design, but also have superior impact resistance compared to ceramics and have the same weight and thermal conductivity as ceramics, making them suitable for the above-mentioned uses.

[0145] The molded article of the present disclosure is also useful as a heat dissipation component in applications requiring high thermal conductivity. For example, it is highly useful as a heat dissipation component, such as a heat dissipation sheet for electronic components (e.g., laptops or mobile devices) that require high thermal conductivity. Applying the resin composition of the present disclosure to part or all of the housing of an electronic device in combination with a heat dissipation sheet is expected to further improve the heat dissipation performance of the electronic device. Furthermore, a housing can be produced that reduces the risk of low-temperature burns during prolonged operation by using the resin composition of the present disclosure for part of the housing and using a material with a reduced metal oxide content or a metal oxide-free material for other parts, such as areas that are frequently touched by hands during operation. Such a housing can be produced, for example, by installing multiple resin injection gates in a mold for molding the housing and injecting resins of different compositions into each gate.

[0146] Other applications include its excellent thermal conductivity, flexibility in shape during molding, and high impact strength, making it useful as a substitute for metal housings. For example, it can be expected to be used in clock and watch housings and straps, furniture parts (such as metal handles), and exterior materials for home appliances such as washing machines and refrigerators. [Example]

[0147] The present disclosure will be described in more detail below based on examples, but the present disclosure is not limited to these examples.

[0148] [1] Preparation The materials used in the examples and comparative examples are as follows.

[0149] [1.1] Thermoplastic resin (A) Random polypropylene (A-1): Prime Polypro J-226UM manufactured by Prime Polymer Co., Ltd. (MFR (230°C, 2.16 kg load): 35 g / 10 min), tensile modulus 1200 MPa (JIS K7161) Block polypropylene (A-2): Prime Polypro J-707EG manufactured by Prime Polymer Co., Ltd. (MFR (230°C, 2.16 kg load): 30 g / 10 min), tensile modulus 1500 MPa (JIS K7161)

[0150] [1.2] Inorganic powder (B) Volcanic ash (B-1), volcanic ash (B-2), and volcanic ash (B-3) were prepared as inorganic powder (B) as follows.

[0151] [1.2.1] Volcanic ash (B-1) Volcanic ash (A) was collected. Volcanic ash (A) was passed through a first sieve (mesh size: 5 mm). The ash that passed through the first sieve was passed through a second sieve (mesh size: 399 μm). The ash that passed through the second sieve was passed through a third sieve (mesh size: 198 μm). The ash that passed through the third sieve was passed through a fourth sieve (mesh size: 150 μm). Volcanic ash that passed through the fourth sieve (mesh size: 150 μm) was extracted (B-1).

[0152] Volcanic ash (B-1) is volcanic ash (A) that passed through sieves 1 to 4 (mesh size: 5 mm to 150 μm). The average particle size of volcanic ash (B-1) was 52.6 μm. The proportion of particles with a particle size of 7 μm or more in volcanic ash (B-1) was 89% by volume.

[0153] [1.2.2] Volcanic ash (B-2) and volcanic ash (B-3) Volcanic ash (B), different from volcanic ash (A), was collected. Volcanic ash (B) was passed through a first sieve (mesh size: 5 mm). The ash that passed through the first sieve was passed through a second sieve (mesh size: 399 μm). The ash that passed through the second sieve was passed through a third sieve (mesh size: 198 μm). The ash that passed through the third sieve was passed through a fourth sieve (mesh size: 150 μm). The ash that passed through the fourth sieve was passed through a fifth sieve (mesh size: 100 μm). The ash that did not pass through the fifth sieve (B-2) and the ash that passed through the fifth sieve were extracted. The ash that passed through the fifth sieve was passed through a sixth sieve (mesh size: 62 μm). The ash that passed through the sixth sieve was passed through a seventh sieve (mesh size: 34 μm). Volcanic ash (B-3) that did not pass through the No. 7 sieve was removed.

[0154] Volcanic ash (B-2) is volcanic ash (A) that passed through sieves No. 1 to No. 4 (mesh openings: 5 mm to 150 μm) but did not pass through sieve No. 5 (mesh openings: 100 μm). The average particle size of volcanic ash (B-2) was 78.5 μm. The volume fraction of volcanic ash (B-2) (7 μm or larger) was 84% ​​by volume.

[0155] Volcanic ash (B-3) is volcanic ash (A) that passed through sieves No. 1 to No. 6 (mesh openings: 5 mm to 62 μm) but did not pass through sieve No. 7 (mesh openings: 34 μm). The average particle size of volcanic ash (B-3) was 26.6 μm. The proportion of particles with a particle size of 7 μm or more in volcanic ash (B-3) was 91% by volume.

[0156] [1.3] Polyolefin wax (C) Unmodified polyethylene wax (C1): "Excelex (registered trademark) 30050B" (molecular weight: 2700) manufactured by Mitsui Chemicals, Inc.

[0157] [1.4] Modified polyolefin resin (D) As the modified polyolefin resin (D), an acid-modified propylene polymer (D-1) was prepared as follows. 100 parts by mass of polypropylene (Prime Polypro (registered trademark) Grade J106G manufactured by Prime Polymer Co., Ltd.) was mixed with 15 parts by mass of maleic anhydride (manufactured by Fujifilm Wako Pure Chemical Industries, Ltd.) and 2.5 parts by mass of dicumyl peroxide (Percumyl D manufactured by NOF Corporation), and the mixture was allowed to react in a toluene solution for 5 hours. This produced an acid-modified propylene polymer (D-2) containing maleic acid-modified polypropylene and unreacted maleic anhydride. The resulting polymer (D-2) was dissolved in xylene and purified by reprecipitation in acetone. The graft amount of maleic anhydride was measured by IR and found to be 2.8% by mass. The number average molecular weight (Mn) was measured by GPC and found to be 18,000. The density was 910 kg / m 3 It was.

[0158] [1.5] Olefin elastomer (E) Ethylene-1-butene copolymer (E1): "Tafmer (registered trademark) A35070S" manufactured by Mitsui Chemicals, Inc. (MFR (230°C, 2.16 kg load): 65 g / 10 min), tensile modulus of elasticity 9.2 MPa (JIS K7161), unmodified.

[0159] [2.1] Examples 1 to 7 and Comparative Examples 1 to 5 The components shown in Table 1 were charged into a kneading machine ("Labo Plastomill" manufactured by Toyo Seiki Seisaku-sho, Ltd.) in the composition ratio (parts by mass) shown in Table 1 and melt-kneaded. The kneading conditions were 190°C and 5 rpm to 90 rpm. The resulting molten kneaded product was cold-pressed using a hand press (Toyo Seiki Seisaku-sho, Ltd.). The temperature of the hot platen of the hand press that came into contact with the molten mixture was 20°C. A pressed sheet was thus obtained.

[0160] [2.2] Examples 8 to 11 A batch-type closed-type kneading device (manufactured by HODEN SEIMITSU KAGAKU KENKYUSHO Co., Ltd., MF-type mixing and melting device, model: MF5000R / L) equipped with a casing and a rotor with stirring blades was prepared. The components shown in Table 2 were charged into the closed-type kneading device in the composition ratios (parts by mass) shown in Table 2. Next, the components were kneaded by high-speed stirring (peripheral speed of the tip of the stirring blade: 40 m / s). When kneading started, the rotational torque of the rotor increased, reached a maximum value, and then decreased. The rate of change of torque decreased after the rotational torque of the rotor reached a maximum value. When the rate of change of torque became 5% or less per second, the rotational torque was determined to have reached a minimum. Kneading was continued for 7 seconds from the point at which the rotational torque reached a minimum, and a molten kneaded product was obtained. "Rate of change of torque" refers to the change in torque over time.

[0161] The minimum rotational torque means that the material is completely melted. The reason for continuing kneading for 7 seconds from the point at which the rotational torque reached a minimum is to confirm that there is no thickening effect due to the molten material.

[0162] The resulting molten mixture was injection molded using an injection molding machine (manufactured by The Japan Steel Works, Ltd., model: J100ADS-180U). The nozzle temperature of the injection molding machine was 200°C, the mold temperature was 60°C, and the injection speed was 100 mm / s. This resulted in the production of an injection-molded piece.

[0163] [3]Measurement method The press sheets and injection-molded specimens obtained in the examples and comparative examples were subjected to the following measurements. The measurement results are shown in Tables 1 and 2.

[0164] [3.1] Charpy impact strength The press sheet and injection-molded specimen were cut to obtain test specimens (80 mm x 10 mm x 2 mm thick, unnotched). The Charpy impact strength of the test specimens was measured in accordance with JIS K7111-1. A digital impact tester "DG-UB" manufactured by Toyo Seiki Seisakusho Co., Ltd. was used for the measurement. The measurement conditions were a hammer capacity of 2 J, a swing angle of 148.9°, and a test temperature of 23°C. The acceptable range of Charpy impact strength was 8.8 kJ / m 2 That's all.

[0165] [3.2] Melt flow rate The melt flow rate of the pressed sheet was measured at 230°C under a load of 2.16 kg in accordance with ASTM D1238E. The acceptable range of the melt flow rate is 24.0 g / 10 min or more.

[0166] [Table 1]

[0167] [Table 2]

[0168] In Table 1, "volume ratio (7 μm or larger)" refers to the volume ratio of inorganic particles with a particle size of 7 μm or larger in the inorganic powder (B). "Content (C / A)" refers to the content of polyolefin wax (C) per 100 parts by mass of thermoplastic resin (A). "34-62" refers to volcanic ash that passed through the first to sixth sieves (mesh openings: 5 mm to 62 μm) but did not pass through the seventh sieve (mesh openings: 34 μm). "100-150" refers to volcanic ash that passed through the first to fourth sieves (mesh openings: 5 mm to 150 μm) but did not pass through the fifth sieve (mesh openings: 100 μm). "-150" refers to volcanic ash that passed through the first to fourth sieves (mesh openings: 5 mm to 150 μm). "Non-destructive" means that the test specimen was not destroyed and the Charpy impact strength could not be measured (i.e., the Charpy impact strength was 9 kJ / m 2 This is clearly the case.)

[0169] [4] Results The resin compositions of Comparative Examples 1 to 5 did not contain the polyolefin wax (C). Therefore, the Charpy impact strength of Comparative Examples 2 to 5 was 8.8 kJ / m 2 The melt flow rates of Comparative Examples 1 to 3 were not 24.0 g / 10 min or more. These results demonstrate that the resin compositions of Comparative Examples 1 to 5 are not "resin compositions excellent in impact strength and fluidity when melted, even if they contain a plurality of inorganic particles having a volume-based particle size of 7 μm or more."

[0170] The resin compositions of Examples 1 to 11 contained a thermoplastic resin (A), an inorganic powder (B), and a polyolefin wax (C). The volume ratio of inorganic particles having a particle diameter of 7 μm or more in the inorganic powder (B) was 25% by volume or more. The content of the polyolefin wax (C) was 0.1 parts by mass to 20 parts by mass per 100 parts by mass of the thermoplastic resin (A). Therefore, the Charpy impact strength of Examples 1 to 11 was 8.8 kJ / m 2 The melt flow rates of Examples 1 to 11 were 24.0 g / 10 min or more. These results demonstrate that the resin compositions of Examples 1 to 11 are "resin compositions that are excellent in impact strength and fluidity when melted, even when containing a plurality of inorganic particles having a volume-based particle size of 7 μm or more."

[0171] Comparison of Examples 8 to 10 revealed that the impact strength tends to decrease when the content of volcanic ash (B) is increased and the content of block polypropylene (A-2) is decreased. Comparison between Example 10 and Example 11 revealed that the impact strength tends to improve when the content of the olefin-based elastomer (E) is increased and the content of the block polypropylene (A-2) is decreased. These results show that the impact strength can be controlled by adjusting the content of the olefin-based elastomer (E).

[0172] When the resin composition was kneaded in the same manner as in Example 8, except that the content of volcanic ash (B) was adjusted to 90% by mass, the resin composition was not compatible. This result showed that melt-kneading of the resin composition is possible if the content of volcanic ash (B) is 80% by mass or less.

Claims

1. The composition contains a thermoplastic resin (A), an inorganic powder (B), and a polyolefin wax (C), The volume ratio of inorganic particles having a particle diameter of 7 μm or more in the inorganic powder (B) is 25 vol% or more, The resin composition, wherein the content of the polyolefin wax (C) is 0.1 to 20 parts by mass per 100 parts by mass of the thermoplastic resin (A).

2. 2. The resin composition according to claim 1, wherein the content of the thermoplastic resin (A) is 15 parts by mass to 90 parts by mass and the content of the inorganic powder (B) is 85 parts by mass to 10 parts by mass, relative to a total of 100 parts by mass of the thermoplastic resin (A) and the inorganic powder (B).

3. The resin composition according to claim 1 , wherein the thermoplastic resin (A) comprises a polyolefin resin.

4. The resin composition according to claim 1, wherein the thermoplastic resin (A) has a melt flow rate of 11 g / 10 min to 100 g / 10 min, measured at 230 ° C. under a load of 2.16 kg in accordance with ASTM D1238E.

5. The resin composition according to claim 1 , further comprising a modified polyolefin resin (D).

6. The resin composition according to claim 1 , further comprising an olefin-based elastomer (E).

7. The resin composition according to claim 5 , further comprising an olefin-based elastomer (E).

8. The resin composition according to claim 1 , wherein the inorganic powder (B) comprises a plurality of naturally occurring inorganic particles.

9. The resin composition according to claim 1 , wherein the inorganic powder (B) comprises a plurality of mineral particles.

10. The resin composition according to claim 1 , wherein the inorganic powder (B) comprises a plurality of oxide mineral particles.

11. The resin composition according to claim 1 , wherein the inorganic powder (B) contains a plurality of metal oxide particles.

12. The inorganic powder (B) is a powder of a plurality of silica (SiO ２ The resin composition according to claim 1 , comprising hydroxyapatite particles.

13. The resin composition according to claim 1 , wherein the inorganic powder (B) comprises volcanic ash.

14. A molded article comprising the resin composition according to any one of claims 1 to 13.

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