Thermoplastic resin composition, method for producing molded article, and molded article

Abstract

To provide a thermoplastic resin composition which has high industrial productivity, and can achieve both ease of warming and ease of cooling as a molded product.SOLUTION: A thermoplastic resin composition contains a thermoplastic resin (A), and an inorganic filler (B). The thermoplastic resin (A) contains one or more resins selected from the group consisting of a polyolefin resin, a polycarbonate resin, an ABS resin and an acrylic resin. When infrared spectroscopy measurement is performed in a wave number area of 4,000-600 [cm-1], the inorganic filler (B) contains a first inorganic filler (B1) having maximum absorption intensity in a wave number area of 1,000 [cm-1] or more, and a second in organic filler (B2) having maximum absorption intensity in a wave number area of less than 1,000 [cm-1].SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a thermoplastic resin composition, a method for producing a molded article, and a molded article. [Background technology]

[0002] BACKGROUND ART Conventionally, techniques for combining resins with inorganic materials have been developed and have been utilized in various industrial fields.

[0003] Such composite materials have been variously improved, particularly in the field of heat dissipation members. For example, Patent Document 1 discloses a technique for adjusting the crystallinity of a resin as a matrix in an inorganic-organic composite composition to improve the thermal conductivity of the composite material. Furthermore, Patent Document 2 discloses a technology in which a thermally conductive filler contained in a composition is combined with a hard filler having a high Mohs hardness and a soft filler having a low Mohs hardness, thereby increasing the thermal conductivity of the material. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-253205 [Patent Document 2] International Publication No. 2013 / 100174 Brochure Summary of the Invention [Problem to be solved by the invention]

[0005] However, the technology disclosed in Patent Document 1 is not necessarily industrially advantageous in that it is not easy to process resins. Furthermore, the technology disclosed in Patent Document 2 also has limitations on its applicability in that molding conditions must be set that are sufficient to deform the soft filler.

[0006] Furthermore, as a result of the inventors' investigations, it has become clear that the ease with which an article formed from a molding material heats up and cools down is not necessarily linked. For example, the heat dissipation members described in the above-mentioned documents are designed to release heat, so they often have a high level of cooling ability, but do not necessarily have a high level of heating ability. Originally, molding materials containing inorganic fillers were often used to replace components made of metal, and from this perspective, there is still room for development of materials that combine the two properties mentioned above.

[0007] In view of the above circumstances, an object of the present invention is to provide a thermoplastic resin composition and the like which has high industrial productivity and can provide a molded product that is both easy to heat and easy to cool. [Means for solving the problem]

[0008] According to one aspect of the present invention, there is provided a thermoplastic resin composition. The thermoplastic resin composition comprises a thermoplastic resin (A) and an inorganic filler (B). The thermoplastic resin (A) comprises one or more resins selected from the group consisting of polyolefin resins, polycarbonate resins, ABS resins, and acrylic resins. The inorganic filler (B) has a wavelength of 4000 to 600 [cm -1 When infrared spectroscopy was performed in the range of 1000 [cm -1 a first inorganic filler (B1) having a maximum absorption intensity in a region where the wave number is 1000 [cm -1and a second inorganic filler (B2) having a maximum absorption intensity in a region where the absorption intensity is less than 1.5 mm. When a 1.5 mm x 50 mm x 50 mm flat test piece is produced by injection molding the thermoplastic resin composition so as to fill the cavity of a mold having a cavity, the test piece satisfies the following [Requirement 1] and [Requirement 2]. [Requirement 1]: When a first flat surface of the test piece having dimensions of 50 mm x 50 mm is joined to a heat source having a surface temperature of 80°C in an atmosphere of room temperature of 25°C and relative humidity of 50% Rh, it takes less than 120 seconds for the surface temperature of the second flat surface located opposite the first flat surface to reach 60°C. [Requirement 2]: After carrying out [Requirement 1], the test piece is removed from the heat source, and the first flat surface is joined to a stainless steel plate having a surface temperature of 25°C. After 90 seconds have passed, the surface temperature of the second flat surface drops by 5°C or more.

[0009] As a result of investigations by the present inventors, it has been found that the desired performance can be ensured by appropriately selecting each component. That is, according to the above-mentioned aspect, a thermoplastic resin composition and the like that can achieve high industrial productivity and both ease of heating and cooling as a molded product is provided. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, embodiments of the present invention will be described. Note that the various features shown in the following embodiments can be combined with each other. Note that in this specification, "~" means "above" through "below" unless otherwise specified.

[0011] <First embodiment> The thermoplastic resin composition of this embodiment is as follows. A thermoplastic resin composition, Contains a thermoplastic resin (A) and an inorganic filler (B), the thermoplastic resin (A) comprises one or more resins selected from the group consisting of polyolefin resins, polycarbonate resins, ABS resins, and acrylic resins; The inorganic filler (B) has a wave number of 4000 to 600 [cm -1When infrared spectroscopy was performed in the range of 1000 [cm -1 a first inorganic filler (B1) having a maximum absorption intensity in a region where the wave number is 1000 [cm -1 and a second inorganic filler (B2) having a maximum absorption intensity in a region where the absorption intensity is less than A thermoplastic resin composition that, when injection-molded into a mold cavity so as to fill the cavity and produce a 1.5 mm x 50 mm x 50 mm flat test piece, satisfies the following [Requirement 1] and [Requirement 2]. [Requirement 1]: When a first plane of a test piece having dimensions of 50 mm x 50 mm is joined to a heat source with a surface temperature of 80°C in an atmosphere of room temperature 25°C and relative humidity 50% Rh, the time required for the surface temperature of the second plane located opposite the first plane to reach 60°C is less than 120 seconds. [Requirement 2]: After carrying out [Requirement 1], the test piece is removed from the heat source, and the first flat surface is joined to a stainless steel plate with a surface temperature of 25°C. After 90 seconds have passed, the surface temperature of the second flat surface drops by 5°C or more. The components, blending, production method, and use of the thermoplastic resin composition will be described in detail below.

[0012] [Ingredients and formulation of thermoplastic resin composition] First, the components contained or that can be contained in the thermoplastic resin composition of this embodiment will be described.

[0013] (Thermoplastic resin (A)) The thermoplastic resin composition of the present embodiment contains, as the thermoplastic resin (A), one or more resins selected from the group consisting of polyolefin resins, polycarbonate resins, ABS resins, and acrylic resins. The thermoplastic resin composition of the present embodiment contains a resin component selected from these resins, which have a good balance between ease of availability and processability, making it easier to achieve the desired effects. Each component will be described below.

[0014] Polyolefin resin The polyolefin resin that can be used in this embodiment is typically a polymer of an olefin (alkene), and typically a polymer containing, as a main structural unit, an α-olefin having about 2 to 10 carbon atoms, such as ethylene, propylene, butene-1, pentene-1, hexene-1, or octene-1. Also usable are homopolymers and copolymers of these α-olefins, as well as copolymers of these with vinyl acetate, acrylic esters, unsaturated carboxylic acids (anhydrides), unsaturated silane compounds, and the like.

[0015] Examples of polyolefin resins that are readily available on the market include Prime Polypro (registered trademark) J105G, J106G, J106MG, J108M, and J-700GP (manufactured by Prime Polymer Co., Ltd.); Novatec MA3, MA3H, MA1B, and SA08 (manufactured by Japan Polypropylene Corporation); and PM600A, PM600D, PM801A, PM802A, PM900A, PM900C, PL400A, PL500A, PL801C, PLA00A, PLB00A, PS412M, VS200A, PC412A, PC600A, PC600S, PF600R, and HPA03A (manufactured by SunAllomer Co., Ltd.).

[0016] Polycarbonate resin The polycarbonate resin that can be used in this embodiment is typically a resin obtained by reacting a dihydric phenol or the like with a carbonate precursor. It may also be a copolymer obtained using two or more dihydric phenols or two or more carbonate precursors. Examples of reaction methods include interfacial polymerization, melt transesterification, solid-phase transesterification of carbonate prepolymers, and ring-opening polymerization of cyclic carbonate compounds.

[0017] Examples of polycarbonate resins that are readily available on the market include the "Iupilon (registered trademark)" series and the "NOVAREX (registered trademark)" series (manufactured by Mitsubishi Engineering Plastics Corporation); the "Panlite (registered trademark)" series (manufactured by Teijin Limited); and the "Toughlon" series (manufactured by Idemitsu Kosan Co., Ltd.).

[0018] ABS resin The ABS resin that can be used in this embodiment is an acrylonitrile-butadiene-styrene copolymer. This ABS resin may also be a mixture of a styrene-acrylonitrile resin and a rubber component. Examples of the rubber component include butadiene-based rubbers such as polybutadiene, butadiene-acrylonitrile rubber (NBR), and styrene-butadiene rubber (SBR), as well as acrylic rubber (AR), ethylene-propylene rubber (EPR), and chlorinated polyethylene (CPE). These may be mixed alone or in combination of two or more.

[0019] Examples of ABS resins that are readily available on the market include the "Dialac (registered trademark)" series (manufactured by Techno UMG Co., Ltd.) and the "Denka ABS" series (manufactured by Denka Co., Ltd.).

[0020] Acrylic resin The acrylic resin that can be used in this embodiment is a general term for resins containing structural units derived from acrylic acid esters or methacrylic acid esters. Examples of such resins include poly(methyl (meth)acrylate), poly(ethyl (meth)acrylate), poly(butyl (meth)acrylate), and poly(2-ethylhexyl (meth)acrylate). In the acrylic resin, the content of structural units derived from (meth)acrylic acid ester is appropriately selected, but is, for example, 50% by weight or more, preferably 60% by weight or more, and more preferably 75% by weight or more.

[0021] Acrylic resins that are readily available on the market include the "ACRYPET" series (manufactured by Mitsubishi Chemical Corporation); the "PARAPET (registered trademark)" series (manufactured by Kuraray Co., Ltd.); the "PLEXIGLAS" series (manufactured by Daicel-Evonik Ltd.); and the "DELPET" series (manufactured by Asahi Kasei Corporation).

[0022] The weight-average molecular weight of the above-mentioned polyolefin resin, polycarbonate resin, ABS resin, or acrylic resin is not particularly limited, but from the viewpoint of further improving the ease of pelletization, flaking, or chipping, it is preferable that the weight-average molecular weight (Mw) is, for example, at least 10,000 to 800,000, preferably 20,000 to 600,000, and more preferably 20,000 to 400,000.

[0023] Other thermoplastic resins The thermoplastic resin composition of this embodiment may contain other thermoplastic resins in addition to the resins described above. Examples of such resins include polystyrene resins, polyamide resins, vinyl chloride resins, polyacetal resins, saturated polyester resins, polyarylsulfone resins, polyarylketone resins, polyarylene ether resins, polyarylene sulfide resins, polyaryletherketone resins, polyethersulfone resins, polyarylenesulfide sulfone resins, and polyarylate resins. Two or more of these resins may also be used.

[0024] The thermoplastic resin (A) that can be used in this embodiment may be a polymer alloy. That is, the above-mentioned polycarbonate resin and ABS resin may be used in combination to form a polymer alloy such as a "PC / ABS resin" as the thermoplastic resin (A).

[0025] The content of the thermoplastic resin (A) in the entire thermoplastic resin composition of this embodiment is not particularly limited, but from the viewpoint of ease of molding processability, etc., it is preferably 60 mass% or more, more preferably 70 mass% or more, even more preferably 80 mass% or more, and especially preferably 90 mass% or more. The upper limit of the content of the thermoplastic resin (A) in the entire thermoplastic resin composition of this embodiment is not particularly limited, but from the viewpoint of easily exhibiting the effects of the inorganic filler (B) described later, it is preferably 98 mass% or less.

[0026] Furthermore, the blending ratio of one or more resins selected from the group consisting of polyolefin resins, polycarbonate resins, ABS resins, and acrylic resins to the total content of thermoplastic resin (A) is not particularly limited, but from the viewpoint of ease of molding processability, cost, etc., it is preferably 60 mass% or more, more preferably 70 mass% or more, even more preferably 80 mass% or more, and particularly preferably 90 mass% or more. Alternatively, the blending ratio of one or more resins selected from the group consisting of polyolefin resins, polycarbonate resins, ABS resins, and acrylic resins to the total content of the thermoplastic resin (A) may be 100 mass % (i.e., the thermoplastic resin (A) consists of only one or more resins selected from the group consisting of polyolefin resins, polycarbonate resins, ABS resins, and acrylic resins).

[0027] (Inorganic filler (B)) The thermoplastic resin composition of the present embodiment contains an inorganic filler (B). Here, the inorganic filler (B) has a wave number of 4000 to 600 [cm -1 When infrared spectroscopy was performed in the range of 1000 [cm -1 a first inorganic filler (B1) having a maximum absorption intensity in a region where the wave number is 1000 [cm -1 and a second inorganic filler (B2) having a maximum absorption intensity in a region where the absorption intensity is less than [0.01].

[0028] The inventors have conducted research and found that materials that have a maximum absorption intensity in the high wavenumber region when infrared spectroscopy is performed tend to radiate thermal energy, while materials that have a maximum absorption intensity in the low wavenumber region when infrared spectroscopy is performed have high thermal conductivity. That is, it has become clear that by appropriately combining these, it is easy to obtain the desired characteristics in a well-balanced manner.

[0029] The infrared spectroscopic measurement is carried out, for example, according to the following procedure. First, 100 mg of potassium bromide is added to 1 mg of the sample to be measured, and then crushed and mixed in an agate mortar. Next, the mixture is placed in a tablet press and pressed to create a 4 mm diameter circular plate, which is used as the measurement sample. The infrared absorption spectrum of the obtained measurement sample is measured by the ATR method using a Fourier transform infrared spectrophotometer (manufactured by PerkinElmer, product name: Frontier) under the following conditions. Crystal: Diamond / ZnSe ·Resolution: 4cm ―1 Number of times: 4 ·Measurement area: 4000cm ―1 ~600cm ―1

[0030] Hereinafter, each component of the inorganic filler (B) will be described.

[0031] First inorganic filler (B1) The first inorganic filler (B1) has a wave number of 4000 to 600 [cm -1 When infrared spectroscopy was performed in the range of 1000 [cm -1 ] or more. Typical examples include fillers made of a material selected from the group consisting of silica, calcium carbonate, zinc oxide, and barium sulfate.

[0032] Examples of silica that is readily available on the market include the "Sciqas" series (manufactured by Sakai Chemical Industry Co., Ltd.); the "Nipsil" series (manufactured by Tosoh Silica Corporation); the "Seahoster (registered trademark)" series (manufactured by Nippon Shokubai Co., Ltd.); the "HPS" series (manufactured by Toagosei Co., Ltd.); the "FB" series and "FBX" series (manufactured by Denka Company, Limited); and the "Adma Fine" series (manufactured by Admatechs Co., Ltd.).

[0033] Examples of calcium carbonate that is readily available on the market include the "NITOREX" series, "NS" series, "SS" series, and "NCC" series (manufactured by Nitto Funka Kogyo Co., Ltd.); the "Nanox" series, "Caltex" series, and "Nanocoat" series (manufactured by Maruo Calcium Co., Ltd.); and the "Sunlight" series and "White Seal" series (manufactured by Takehara Chemical Industry Co., Ltd.).

[0034] Here, the average particle size of the first inorganic filler (B1) is preferably 0.15 μm or more and less than 20 μm, more preferably 0.2 μm or more and less than 15 μm, and even more preferably 0.3 μm or more and less than 12 μm. By employing a filler having such a particle size, it can be appropriately dispersed in the composition, which can contribute to improving the ease with which a molded article formed from the thermoplastic resin composition cools. Furthermore, the first inorganic filler (B1) may have an average particle size of less than 10 μm, less than 8 μm, or less than 5 μm.

[0035] The method for measuring the average particle size of the filler may be appropriately selected depending on the particle size of the filler. Examples of measuring devices that can be used include the Zetasizer Nano ZS (manufactured by Spectris Inc.) and the precision particle size distribution measuring device "Coulter Counter Multisizer 3" (manufactured by Beckman Coulter Inc.).

[0036] The first inorganic filler (B1) preferably has a circularity of 0.7 or more, more preferably 0.8 or more, and even more preferably 0.85 or more. By employing a filler with such a circularity, it becomes easier to obtain the effect of preventing damage to molds and equipment when the thermoplastic resin composition is subjected to a molding step.

[0037] The circularity of the filler can be determined as follows. First, 50 fillers are randomly selected from a scanning electron microscope. The fillers selected here are fillers with particle sizes in the range of 0.8X to 1.2X, where X is the average particle size of the entire filler. Next, when the area of ​​the two-dimensional photographed image of the particles is S and the perimeter is L, the circularity coefficient between the particles is 4πS / L. 2 The circularity is calculated from the formula, and the arithmetic mean value of the circularity coefficients of each particle is taken as the circularity. Here, if the two-dimensional projected image of a particle is a perfect circle, the circularity of the particle is 1.

[0038] The first inorganic filler (B1) preferably has a Mohs hardness of 2 or more. By using a filler with such a Mohs hardness, the filler is less likely to be damaged when the thermoplastic resin composition is produced by kneading or the like, and as a result, the quality of the product tends to be stable. The Mohs hardness can be measured by using a standard material and determining whether or not scratches are generated by rubbing against the standard material. The Mohs hardness of the first inorganic filler (B1) is more preferably 3 or more, further preferably 4 or more, and particularly preferably 5 or more.

[0039] The oil absorption of the first inorganic filler (B1) may be controlled to a predetermined value. Specifically, the oil absorption of the first inorganic filler (B1) is preferably 200 ml / 100 g or less, more preferably 100 ml / 100 g or less, and even more preferably 50 ml / 100 g or less. By setting the oil absorption of the first inorganic filler (B1) within the above range, the voids within the particles are reduced, and it becomes easier to achieve a good balance between the ease of cooling of the resulting molded article. The lower limit of the oil absorption of the first inorganic filler (B1) is not particularly limited, but is, for example, 3 ml / 100 g or more. The oil absorption of the filler may be measured in accordance with the method described in JIS K 5101-13-1 (2004) "Section 1: Refined linseed oil method."

[0040] The first inorganic filler (B1) is preferably a filler whose surface has been subjected to a hydrophobic treatment. By using the first inorganic filler (B1) that has been subjected to such a hydrophobic treatment, the dispersibility in the thermoplastic resin is further increased, and the injection moldability is improved.

[0041] The hydrophobic treatment of the first inorganic filler (B1) can be carried out, for example, by reacting the first inorganic filler (B1) with a silane compound. Examples of silane compounds include compounds represented by R1-Si(OR2)3 (where R1 and R2 are carbon chains). The carbon chain may be linear or branched. While the number of carbon atoms in the carbon chain is not particularly limited, linear or branched alkyl groups having 3 or more carbon atoms are preferred, and linear or branched alkyl groups having 5 or more carbon atoms are even more preferred. Furthermore, while the upper limit of the carbon chain is not particularly limited, typically linear or branched alkyl groups having 20 or less carbon atoms can be used, and linear or branched alkyl groups having 18 or less carbon atoms are even more preferred.

[0042] Examples of silane compounds that can be used for the hydrophobic treatment in this embodiment include the KBM series such as KBM-3033, KBM-3063, KBE-3083, and KBM-3103C, LS-6970 (manufactured by Shin-Etsu Silicones Co., Ltd.), and D3383 (manufactured by Tokyo Chemical Industry Co., Ltd.).

[0043] The content of the first inorganic filler (B1) is preferably 0.3 parts by mass or more and 20 parts by mass or less, more preferably 0.8 parts by mass or more and 15 parts by mass or less, and even more preferably 1.5 parts by mass or more and 12 parts by mass or less, when the content of the thermoplastic resin (A) is 100 parts by mass. By setting the content of the first inorganic filler (B1) within this range, it becomes easier to achieve both the ease of cooling of a molded article formed from the thermoplastic resin composition and the moldability of the thermoplastic resin composition.

[0044] The content of the first inorganic filler (B1) is preferably 5 parts by mass or more and 95 parts by mass or less, more preferably 10 parts by mass or more and 90 parts by mass or less, and even more preferably 20 parts by mass or more and 80 parts by mass or less, when the content of the inorganic filler (B) is 100 parts by mass. By setting the content of the first inorganic filler (B1) within this range, it becomes easier to achieve compatibility between the ease of cooling and the ease of heating of the molded article formed from the thermoplastic resin composition.

[0045] Second inorganic filler (B2) The second inorganic filler (B2) has a wave number of 4000 to 600 [cm -1 When infrared spectroscopy was performed in the range of 1000 [cm -1 ]. Here, various pigments can be preferably used as the second inorganic filler (B2), and typical examples thereof include white pigments such as titanium oxide (titanium white), zinc oxide (zinc white), white lead, basic lead sulfate, lead sulfate, lithopone, zinc sulfide, and antimony white; yellow pigments such as Ti / Cr / Sb complex oxide and yellow lead; orange pigments such as chrome orange and chrome vermilion; brown pigments such as iron oxide and umber; red pigments such as red iron oxide and red lead; purple pigments such as cobalt purple; blue pigments such as ultramarine, iron blue, and cobalt blue; and green pigments such as chrome green and cadmium green. Among these, from the viewpoint of high availability, it is preferable to use a filler composed of a material selected from the group consisting of titanium oxide, iron oxide, and composite oxide pigments as the second filler (B2). Furthermore, materials that do not belong to the pigment category, such as talc, can also be used as the second inorganic filler (B2).

[0046] Examples of titanium oxides that are readily available on the market include the "Tipake (registered trademark)" series (manufactured by Ishihara Sangyo Kaisha, Ltd.); the "R" series (manufactured by Sakai Chemical Industry Co., Ltd.); the "JR" series and "MT" series (manufactured by Teika Corporation); the "ST-700" series (manufactured by Titanium Kogyo Co., Ltd.); and the "TR" series (manufactured by Fuji Titanium Kogyo Co., Ltd.).

[0047] Examples of iron oxides that are readily available on the market include the "TAROX Synthetic Iron Oxide" series (manufactured by Titanium Kogyo Co., Ltd.) and the "Todacolor" series (manufactured by Toda Kogyo Co., Ltd.).

[0048] Examples of composite oxide pigments that are readily available on the market include "DAIPY R OXIDE" series (manufactured by Dainichiseika Color & Chemicals Mfg. Co., Ltd.); composite oxide pigments (manufactured by Asahi Kasei Kogyo Co., Ltd.); "Tomatec Color" (manufactured by TOMATEC Corporation); and "DYNAMIX (registered trademark)" series (manufactured by Shepherd Color Co., Ltd.).

[0049] Examples of talc readily available on the market include the "Micro Ace (registered trademark)" series and the "Nano Ace (registered trademark)" series (manufactured by Nippon Talc Co., Ltd.); "HC-08L" and "HC-1L" (manufactured by Hyogo Clay Co., Ltd.).

[0050] The average particle size of the second inorganic filler (B2) is preferably 5 nm or more and 10 μm or less, more preferably 20 nm or more and 5 μm or less, and even more preferably 40 nm or more and 3 μm or less. By employing a filler having such a particle size, it can be appropriately dispersed in the composition, which can contribute to improving the ease of heating of a molded article formed from the thermoplastic resin composition.

[0051] The second inorganic filler (B2) may be a filler whose surface has been subjected to a hydrophobic treatment. By using the second inorganic filler (B2) that has been subjected to such a hydrophobic treatment, the dispersibility in the thermoplastic resin is further increased, and the injection moldability is improved. The hydrophobic treatment that can be carried out is the same as that explained for the first inorganic filler (B1).

[0052] The content of the second inorganic filler (B2) is preferably 0.3 parts by mass or more and 20 parts by mass or less, more preferably 0.8 parts by mass or more and 15 parts by mass or less, and even more preferably 1.5 parts by mass or more and 12 parts by mass or less, when the content of the thermoplastic resin (A) is 100 parts by mass. By setting the content of the second inorganic filler (B2) within this range, it becomes easier to achieve both the ease of warming of a molded article formed from the thermoplastic resin composition and the moldability of the thermoplastic resin composition.

[0053] The content of the second inorganic filler (B2) is preferably 5 parts by mass or more and 95 parts by mass or less, more preferably 10 parts by mass or more and 90 parts by mass or less, and even more preferably 20 parts by mass or more and 80 parts by mass or less, when the content of the inorganic filler (B) is 100 parts by mass. By setting the content of the second inorganic filler (B2) within this range, it becomes easier to achieve compatibility between the ease of cooling and the ease of heating of a molded article formed from the thermoplastic resin composition.

[0054] In the thermoplastic resin composition, when the content of the thermoplastic resin (A) is 100 parts by mass, the content of the inorganic filler (B) is preferably 1 part by mass or more and 30 parts by mass or less, more preferably 2 parts by mass or more and 25 parts by mass or less, even more preferably 3 parts by mass or more and 20 parts by mass or less, especially preferably 4 parts by mass or more and 15 parts by mass or less, and particularly preferably 5 parts by mass or more and 10 parts by mass or less. By setting the content of the inorganic filler (B) within this range, it becomes easier to obtain desired properties for a molded article formed from the thermoplastic resin composition, and the moldability of the thermoplastic resin composition is improved.

[0055] (Other ingredients) In addition to the components described above, the thermoplastic resin composition of the present embodiment may contain known components as needed, such as lubricants, antioxidants, heat stabilizers, light resistance agents, weather resistance agents, metal deactivators, ultraviolet absorbers, copper inhibitors, antibacterial agents, antifungal agents, dispersants, plasticizers, flame retardants, tackifiers, colorants, organic fibers, and composite fibers.

[0056] [Method of producing thermoplastic resin composition] The thermoplastic resin composition of this embodiment can be produced in accordance with a known production method. For example, it can be produced by melt kneading, etc., and this melt kneading can also be carried out by a known method using a known device. For example, there is a method in which the above-mentioned components are mixed using a mixing device such as a Henschel mixer, a ribbon blender, a tumble mixer, etc., and then melt kneaded, or a method in which the components are continuously fed at a constant ratio using a constant feeder to obtain a mixture, and then the mixture is melt kneaded using a single-screw or twin-screw or more extruder, a Banbury mixer, a roll kneader, etc. The thermoplastic resin composition of the present embodiment may be processed into pellets or flakes.

[0057] The temperature for the melt-kneading may be adjusted appropriately depending on the type of thermoplastic resin (A) and is generally 130°C to 350°C, but is not limited thereto.

[0058] [Characteristics of thermoplastic resin composition] The thermoplastic resin composition of the present embodiment is injection molded so as to fill the cavity of a mold having a cavity, and when a flat test piece of 1.5 mm × 50 mm × 50 mm is produced, the test piece satisfies the following [Requirement 1] and [Requirement 2]. [Requirement 1]: In an atmosphere of room temperature 25°C and relative humidity 50% Rh, when a first flat surface of a test piece having dimensions of 50 mm x 50 mm is joined to a heat source with a surface temperature of 80°C, it takes less than 120 seconds for the surface temperature of the second flat surface located opposite the first flat surface to reach 60°C. [Requirement 2]: After carrying out [Requirement 1], the test piece is removed from the heat source, and the first flat surface is joined to a stainless steel plate with a surface temperature of 25°C. After 90 seconds, the surface temperature of the second flat surface drops by 5°C or more.

[0059] In other words, a molded article formed from a thermoplastic resin composition is both easy to heat and easy to cool. A thermoplastic resin composition that satisfies these requirements is useful, for example, as a replacement for metal components.

[0060] The conditions for preparing the test pieces may be set as appropriate as long as they satisfy the above requirements. For example, the pelletized thermoplastic resin composition may be placed in an injection molding machine (SE50EV-A, manufactured by Sumitomo Heavy Industries, Ltd.). If polypropylene is used as the thermoplastic resin (A), injection molding may be performed under conditions of a cylinder temperature of 200°C, a mold temperature of 30°C, and a cooling time of 15 seconds. If the thermoplastic resin (A) is a resin other than polypropylene, the conditions may be set according to the properties of the resin, such as its softening point. Even if the thermoplastic resin (A) is polypropylene, conditions other than those described above may be used depending on the grade, etc. In this specification, "filling the cavity" refers to filling the cavity of a mold with a thermoplastic resin composition (molding material), and does not include methods such as gas-assisted molding, which intentionally create voids in a test piece.

[0061] Regarding [Requirement 1], the time required for the surface temperature of the second plane to reach 60°C is preferably less than 90 seconds, more preferably less than 60 seconds, and even more preferably less than 30 seconds.

[0062] Regarding [Requirement 2], the decrease in the second surface temperature is preferably 10°C or more, more preferably 20°C or more, and even more preferably 30°C or more.

[0063] The means for satisfying the above requirements is not limited, but typical examples include (1) appropriately selecting the types of the first inorganic filler (B1) and the second inorganic filler (B2), (2) appropriately selecting the composition ratio of the first inorganic filler (B1) and the second inorganic filler (B2), (3) appropriately selecting the particle sizes of the first inorganic filler (B1) and the second inorganic filler (B2), and (4) appropriately selecting the combination of the thermoplastic resin (A) in addition to the first inorganic filler (B1) and the second inorganic filler (B2).

[0064] [Manufacturing method for molded products] The thermoplastic resin composition of the present embodiment can be molded into a molded article by molding. The production method includes a method including a step of subjecting the above-mentioned thermoplastic resin composition to injection molding, compression molding, extrusion molding or blow molding.

[0065] For example, when the above-described thermoplastic resin composition is used as a molding material and molded by injection molding, the resin composition is melted using a known injection molding machine, and the molten resin composition is injected into a mold to mold it. The temperature conditions for injection molding are determined appropriately depending on the type of thermoplastic resin (A), and it is preferable to set the cylinder temperature of the injection molding machine to a temperature 10 to 80°C higher than the flow initiation temperature of the thermoplastic resin used. Specifically, the melt-kneading temperature (plasticization zone) is preferably 130 to 350°C, more preferably 150 to 340°C, and even more preferably 170 to 320°C.

[0066] The temperature of the mold is preferably set in the range of room temperature (for example, 23°C) to 180°C in terms of the cooling rate of the resin composition and productivity. Other injection conditions may be appropriately adjusted, such as the screw rotation speed, back pressure, injection speed, dwell pressure, dwell time, etc. Although the conditions for producing the above-mentioned test specimens excluded gas assist and other conditions for filling the mold cavity, such conditions may be incorporated when producing the present molded body.

[0067] The molded article formed from the thermoplastic resin composition of the present embodiment may be subjected to a surface treatment, such as embossing, corona discharge treatment, flame treatment, plasma treatment, or ozone treatment.

[0068] [Use of molded products] Applications of molded articles formed from the thermoplastic resin composition of this embodiment include home appliance components, cooking utensils, toy components, gardening components, automotive components, protective components, and packaging materials. Examples of home appliance components include watch components, mobile phone components, and white goods. Examples of cooking utensils include pots, frying pans, and saucepans. Examples of toy components include plastic model components, diorama components, and video game console components. Examples of gardening components include planter components, flower vase components, and flowerpot components. Examples of automotive components include bumper components and instrument panels. Examples of protective components include helmets and protective plates. Examples of packaging materials include food packaging, textile packaging, and miscellaneous goods packaging. Other applications include monitor components, office automation (OA) equipment components, medical components, drain pans, toiletry components, bottles, and containers.

[0069] <Second embodiment> Next, the thermoplastic resin composition according to the second embodiment will be described. The thermoplastic resin composition of this embodiment is as follows. A thermoplastic resin composition, Contains a thermoplastic resin (A) and an inorganic filler (B), the thermoplastic resin (A) comprises one or more resins selected from the group consisting of polyolefin resins, polycarbonate resins, ABS resins, and acrylic resins; The inorganic filler (B) has a wave number of 4000 to 600 [cm -1 When infrared spectroscopy was performed in the range of 1000 [cm -1a first inorganic filler (B1) having a maximum absorption intensity in a region where the wave number is 1000 [cm -1 and a second inorganic filler (B2) having a maximum absorption intensity in a region where the absorption intensity is less than the content of the first inorganic filler (B1) is 0.3 parts by mass or more and 20 parts by mass or less when the content of the thermoplastic resin (A) is 100 parts by mass, A thermoplastic resin composition, wherein the first inorganic filler (B1) has an average particle size of 0.15 μm or more and less than 20 μm.

[0070] The thermoplastic resin composition of the second embodiment can generally adopt the same configuration as the thermoplastic resin composition of the first embodiment described above, but it is optional whether to satisfy the above-mentioned [Requirement 1] and [Requirement 2], and instead is characterized in that the content of the first inorganic filler (B1) is 0.3 parts by mass or more and 20 parts by mass or less when the content of the thermoplastic resin (A) is 100 parts by mass, and the average particle size of the first inorganic filler (B1) is 0.15 μm or more and less than 20 μm. By adopting such a configuration, it becomes easier to obtain desired properties. The content and average particle size of the first inorganic filler (B1) may be within the ranges other than those described in the first embodiment. The thermoplastic resin composition may also satisfy [Requirement 1] or [Requirement 2].

[0071] Other aspects such as the manufacturing method and applications (manufacturing of molded products) are the same as those described in the first embodiment, and therefore will not be described here.

[0072] Furthermore, it may be provided in the following aspects. The thermoplastic resin composition, wherein the content of the first inorganic filler (B1) is 0.3 parts by mass or more and 20 parts by mass or less when the content of the thermoplastic resin (A) is 100 parts by mass. In the thermoplastic resin composition, the first inorganic filler (B1) has an average particle size of 0.15 μm or more and less than 20 μm. The thermoplastic resin composition, wherein the content of the inorganic filler (B) is 1 part by mass or more and 30 parts by mass or less when the content of the thermoplastic resin (A) is 100 parts by mass. The thermoplastic resin composition, wherein the circularity of the first inorganic filler (B1) is 0.7 or more. The thermoplastic resin composition, wherein the first inorganic filler (B1) has a Mohs hardness of 2 or more. The thermoplastic resin composition, wherein the first inorganic filler (B1) is a filler made of a material selected from the group consisting of silica, calcium carbonate, zinc oxide, and barium sulfate. The thermoplastic resin composition, wherein the first inorganic filler (B1) is a filler whose surface has been subjected to a hydrophobic treatment. In the thermoplastic resin composition, the second inorganic filler (B2) is a filler made of a material selected from the group consisting of titanium oxide, iron oxide, and composite oxide pigments. A method for producing a molded article, comprising a step of injection molding, compression molding, extrusion molding, or blow molding the thermoplastic resin composition. A molded article obtained by molding the thermoplastic resin composition. Of course, this is not the case. [Example]

[0073] The present invention will be described in more detail below with reference to examples and comparative examples, but the present invention is not limited to the following examples.

[0074] [Raw materials used] First, the raw materials used in this example will be described.

[0075] The various raw materials used in this example are as follows: (Thermoplastic resin (A)) A-1: Novatec MA3 (Japan Polypropylene Corporation, isotactic polypropylene resin, weight-average molecular weight 397,000) A-2: Iupilon H-4000 (Mitsubishi Engineering Plastics Corporation, bisphenol A aromatic polycarbonate resin, TG = 148°C, weight-average molecular weight 33,000) A-3: Dialac (registered trademark) M U400 (manufactured by Techno UGM Co., Ltd., transparent acrylonitrile-butadiene-styrene copolymer synthetic resin) A-4: ACRYPET VH-001 (manufactured by Mitsubishi Chemical Corporation, acrylic resin containing 95% or more by mass of repeating units derived from methyl methacrylate, TG=90°C, weight-average molecular weight 168,000) (Inorganic filler (B)) B1-1: Sciqas GRADE 0.4 μm (Sakai Chemical Industry Co., Ltd., spherical silica, average particle size 0.4 μm, oil absorption 24 ml / 100 g) B1-2: Sciqas GRADE 0.7 μm (Sakai Chemical Industry Co., Ltd., spherical silica, average particle size 0.7 μm, oil absorption 20 ml / 100 g) B1-3: Hydrophobically treated inorganic filler B1-2 (manufactured by Sakai Chemical Industry Co., Ltd., spherical silica, average particle size 0.7 μm, oil absorption 19 ml / 100 g) B1-4: Nipsil E1011 (manufactured by Tosoh Silica Corporation, amorphous silica, average particle size 1.5 μm, oil absorption 346 ml / 100 g) B1-5: F-HS14 (Kinseimatec Co., Ltd., fused silica, average particle size 14 μm) B1-6: Nanox #30 (Maruo Calcium Co., Ltd., calcium bicarbonate, average particle size 1.3 μm, oil absorption 50 ml / 100 g) B1-7: Aerosil (registered trademark) R972 (manufactured by Nippon Aerosil Co., Ltd., fumed silica, average particle size 12 nm) B1-8: Hi-F200R (Kinseimatec Co., Ltd., fused silica, average particle size 27 μm) B2-1: TTO55(C) (Ishihara Sangyo Kaisha, Ltd., ultrafine particle titanium dioxide (rutile type), average particle size 0.035 μm) B2-2: TIPAKE (registered trademark) CR-95 (manufactured by Ishihara Sangyo Kaisha, Ltd., chlorine-process titanium dioxide (rutile type), average particle size 0.28 μm) B2-3: Typaque (registered trademark) PFR404 (manufactured by Ishihara Sangyo Kaisha, Ltd., sulfuric acid process, rod-shaped extra-large particles of titanium dioxide (rutile type), average particle size 1.0 μm) B2-4: TAROX synthetic iron oxide R-516-L (manufactured by Titanium Industries Co., Ltd., synthetic iron oxide, average particle size 100 nm) B2-5: Brown30C888 (Shepherd Color Japan Inc., composite oxide pigment, average particle size 1.0 μm) B2-6: MicroAce (registered trademark) P-3 (manufactured by Nippon Talc Co., Ltd., fine powder talc, average particle size 5.0 μm)

[0076] Here, the above-mentioned component B1-3 was prepared as follows. Spherical silica (Sakai Chemical Industry Co., Ltd., Sciqas, spherical silica, average particle size 0.7 μm, oil absorption 20 ml / 100 g, specific surface area 4.3 m 2 100 parts by mass of silane compound (manufactured by Shin-Etsu Chemical Co., Ltd., n-propyltrimethoxysilane (C3 monofunctional silane), KBM-3033, molecular weight 164.3, minimum coverage area 475 m) 2 1.55 parts by mass of tin stearate (1.55 parts by mass of tin stearate / g) and 0.05 parts by mass of dibutyltin dilaurate (TN-12, manufactured by Sakai Chemical Industry Co., Ltd.) were added to 200 parts by mass of heptane and mixed with stirring to obtain a mixed solution.

[0077] This mixed solution was stirred for 1 hour while heating at 80°C, allowing the spherical silica contained in the solution to react with the silane compound. The mixed solution was then cooled to room temperature, filtered, washed, and dried at 80°C. In this way, spherical silica whose surface had been treated with the silane compound and whose surface had been modified with groups containing propyl groups was obtained.

[0078] Regarding the inorganic filler (B), the above-mentioned average particle size is measured according to the particle size as follows. <When the average particle size is less than 5 μm> (1) Preparation of measurement samples 0.01 g of each sample listed in Table 1 and 10 g of methanol were weighed into a glass beaker and dispersed at 28 kHz for 2 minutes using an ultrasonic cleaner (VS-100III, manufactured by AS ONE Corporation) to obtain a measurement sample. (2) Average particle size measurement The measurement sample was placed in a dedicated glass cell, and light scattering measurement was performed using a Zetasizer Nano ZS (manufactured by Malvern Instruments) at a measurement temperature of 25° C. Then, the harmonic mean particle size (Z-average particle size) weighted by the scattering intensity was calculated. <When the average particle size is 5 μm or more> (1) Preparation of measurement samples 1 g of each sample listed in Table 1 and 19 g of methanol were weighed into a glass beaker and dispersed at 28 kHz for 2 minutes using an ultrasonic cleaner (VS-100III, manufactured by AS ONE Corporation) to obtain a measurement sample. (2) Apparatus and conditions used for measuring average particle size Measurement equipment: Precision particle size distribution measurement equipment (Beckman Coulter, "Coulter Counter Multisizer 3") - Dedicated software included with the device: Beckman Coulter Multisizer3 Version 3.51 Electrolyte solution: Beckman Coulter's ISOTON II Aperture diameter: 100 μm (3) Average particle size measurement Approximately 200 mL of the above-mentioned electrolytic solution was placed in a 250 mL round-bottom glass beaker designed specifically for the precision particle size distribution analyzer, and the measurement sample was added dropwise using a pipette to adjust the measurement concentration to a value that would result in a count of approximately 10,000 particles per 10 seconds. Measurements were then continued until the number of particles measured reached 50,000. The measurement data obtained was analyzed using the dedicated software provided with the device, and the volume average particle size was calculated (the volume average particle size can be calculated by taking the average value in the particle size distribution based on the volume of the measured particle size).

[0079] Of the materials used above, the oil absorption of each of the components B1-1 to B1-4 and B1-6 was measured in accordance with the method described in JIS K 5101-13-1 (2004) "Section 1: Refined linseed oil method."

[0080] Furthermore, the Mohs hardness and circularity of the B1-1 to B1-8 and B2-6 components were measured according to the following method. The results are summarized in Table 1.

[0081] (Mohs hardness measurement) The Mohs hardness of each sample was measured using standard materials with a Mohs hardness of 1 to 10, based on the presence or absence of scratches caused by rubbing the sample against the standard materials. (Circularity measurement) Using a scanning electron microscope, 50 fillers were randomly selected from the average particle diameter obtained by the above-mentioned average particle diameter measurement. The fillers selected here were fillers with particle diameters in the range of 0.8X to 1.2X, where X is the average particle diameter of the entire filler. Next, when the area of ​​the two-dimensional photographed image of the particle is S and the perimeter is L, the circularity coefficient between the particles was calculated as 4πS / L. 2 The circularity was calculated from the formula below, and the arithmetic mean value of the circularity coefficient of each particle was taken as the circularity. When the two-dimensional projection image of a particle is a perfect circle, the circularity of the particle is 1. The evaluation criteria for circularity were as follows: A: 0.85 or higher B: 0.7 or more and less than 0.85 C: Less than 0.7

[0082] [Table 1]

[0083] In addition, for each inorganic filler (B), infrared spectroscopy was performed to measure the wave number of 4000 to 600 [cm -1 The measurement conditions are as follows, and the results are shown in Table 2.

[0084] (Infrared spectroscopy) (1) Preparation of measurement samples 100 mg of potassium bromide was added to 1 mg of each sample, and the mixture was crushed and mixed in an agate mortar. This was then placed in a tablet press and pressed into a 4 mm diameter circular plate, which was used as the measurement sample. (2) Infrared spectroscopy The infrared absorption spectrum of each measurement sample was measured by the ATR method using a Fourier transform infrared spectrophotometer (manufactured by PerkinElmer, product name: Frontier). The detailed conditions are as follows: Crystal: Diamond / ZnSe ·Resolution: 4cm ―1 Number of times: 4 ·Measurement area: 4000cm ―1 ~600cm ―1

[0085] [Table 2]

[0086] [Preparation of Thermoplastic Resin Composition and Molded Article] According to the following steps, a thermoplastic resin composition in pellet form and a molded body were produced. <Pellet manufacturing process> The thermoplastic resin and inorganic filler were dry-blended in the mixing ratios shown in Table 3, then charged into a twin-screw extruder (Labo Plastomill, model 4C-150, manufactured by Toyo Seiki Co., Ltd.) equipped with a 2 mm diameter strand die, melt-kneaded at a cylinder temperature of 180°C and a screw rotation speed of 60 rpm, extruded into strands, and water-cooled. After water-cooling, the composition was cut using a pelletizer and dried at 100°C for 3 hours using a dehumidifying dryer. This yielded pellet-shaped compounds (compound pellets) with a diameter of approximately 5 mm. <Molded object manufacturing process> The compound pellets obtained in the pellet manufacturing process were placed in an injection molding machine (SE50EV-A, manufactured by Sumitomo Heavy Industries, Ltd.) and injection molded to obtain a 1.5 mm x 50 mm x 50 mm flat plate-shaped molded product. The temperature and time conditions during injection molding were changed depending on the type of thermoplastic resin (A) used. The correspondence between the type of thermoplastic resin (A) and the conditions adopted is shown below. When using A-1: ​​Cylinder temperature 200°C, mold temperature 30°C, cooling time 15 seconds When using A-2: Cylinder temperature 300°C, mold temperature 80°C, cooling time 15 seconds When using A-3: Cylinder temperature 240℃, mold temperature 50℃, cooling time 15 seconds When using A-4: Cylinder temperature 250℃, mold temperature 60℃, cooling time 15 seconds

[0087] [evaluation] The properties of the obtained thermoplastic resin compositions were evaluated. Specifically, the ease of heating and cooling of the molded articles and the injection moldability were evaluated. The measurement methods are as follows, and the results are summarized in Table 3.

[0088] <Method for measuring ease of warmth> As heat sources, an experimental economy hot plate EHP-170N and a test plate (the above-mentioned flat molded article) with a thermocouple (K type, class 2) attached to the center of its surface (50 mm × 50 mm surface) were prepared. This test plate was placed in the center of a hot plate with a surface temperature of 80°C, with the surface opposite to the surface with the thermocouple attached being in contact, and the time it took for the temperature of the test plate to reach 60°C was measured using a thermometer (T&D Corporation, Ondotori TR-7u) connected to the thermocouple. The measurements were carried out in an atmosphere of 25°C and relative humidity of 50%, and the evaluation was carried out according to the following criteria for ease of warmth. [Easy-to-warm evaluation criteria] Under 5:30 seconds 4: Between 30 seconds and 60 seconds 3: Between 60 and 90 seconds 2: Between 90 and 120 seconds 1:120 seconds or more

[0089] <Method for measuring cooling speed> After the temperature of the test plate reached 60°C, the test plate was moved onto a stainless steel plate with a surface temperature of 25°C so that the side opposite to the side where the thermocouple was attached was in contact with the stainless steel surface.The temperature was measured after 90 seconds, and the extent of the temperature drop was calculated using the following formula to obtain an evaluation score. Decrease (℃) = 60 (℃) - (temperature after 90 seconds (℃)) [Evaluation criteria for cooling speed] 5: Temperature drop of 30°C or more 4: Decrease in temperature: 20°C or more and less than 30°C 3: Decrease in temperature: 10°C or more but less than 20°C 2: Decrease in temperature: 5°C or more but less than 10°C 1: Decrease in temperature less than 5°C

[0090] <Injection moldability> The molding conditions for each shot during molding (mainly the peak filling pressure during injection and the position at which the pressure is held) were observed and evaluated according to the following criteria. The results are shown in Table 3. 5: Stable injection molding 4: There is a slight variation in the peak filling pressure or the position at which the pressure is held, but injection molding can be performed without any problems. 3: Although there is variation in the peak filling pressure or the position at which the pressure is held, injection molding can be performed without any problems. 2: Although the peak filling pressure and the position at the end of the holding pressure are not stable, injection molding is still possible. 1: Cannot be weighed and injection molded

[0091] [Table 3]

[0092] As can be seen from the results of this example, the thermoplastic resin composition of this embodiment can provide a material that has high industrial productivity and can be used as a molded product that is both easy to heat and easy to cool.

Claims

1. A thermoplastic resin composition for use in injection molding, comprising: Contains a thermoplastic resin (A) and an inorganic filler (B), the thermoplastic resin (A) comprises one or more resins selected from the group consisting of polyolefin resins, polycarbonate resins, ABS resins, and acrylic resins; The inorganic filler (B) has a wave number of 4000 to 600 [cm －１ When infrared spectroscopy was performed in the range of 1000 [cm －１ a first inorganic filler (B1) having a maximum absorption intensity in a region where the wave number is 1000 [cm －１ a second inorganic filler (B2) having a maximum absorption intensity in a region where the absorption intensity is less than the first inorganic filler (B1) is a particle composed of silica or calcium carbonate, the second inorganic filler (B2) is composed of a material selected from the group consisting of titanium oxide, iron oxide, and composite oxide pigments; the composite oxide pigment is a pigment containing two or more elements selected from the group consisting of titanium, antimony, nickel, chromium, iron, aluminum, zinc, cobalt, manganese, magnesium, bismuth, and tin; A thermoplastic resin composition (excluding, however, a thermoplastic resin composition when used as a resin composition for laser marking, a thermoplastic resin composition when used to form a foamed molded article, and a thermoplastic resin composition when both the first inorganic filler (B1) and the second inorganic filler (B2) are composited with a fatty acid or a salt thereof) that satisfies the following [Requirement 1] and [Requirement 2] when a flat test piece of 1.5 mm x 50 mm x 50 mm is produced by injection molding the thermoplastic resin composition so as to fill the cavity of a molded body having the cavity. [Requirement 1]: When a first flat surface of a test piece having dimensions of 50 mm x 50 mm is joined to a heat source having a surface temperature of 80°C in an atmosphere of room temperature 25°C and relative humidity 50% Rh, the time required for the surface temperature of a second flat surface located opposite the first flat surface to reach 60°C is less than 120 seconds. [Requirement 2]: After carrying out [Requirement 1], the test piece is separated from the heat source, and the first flat surface is joined to a stainless steel plate having a surface temperature of 25°C. After 90 seconds have passed, the surface temperature of the second flat surface drops by 5°C or more.

2. The thermoplastic resin composition according to claim 1, a thermoplastic resin composition in which the content of the first inorganic filler (B1) is 0.3 parts by mass or more and 20 parts by mass or less when the content of the thermoplastic resin (A) is 100 parts by mass;

3. The thermoplastic resin composition according to claim 1 or claim 2, The thermoplastic resin composition, wherein the first inorganic filler (B1) has an average particle size of 0.15 μm or more and less than 20 μm.

4. A thermoplastic resin composition for use in injection molding, comprising: Contains a thermoplastic resin (A) and an inorganic filler (B), the thermoplastic resin (A) comprises one or more resins selected from the group consisting of polyolefin resins, polycarbonate resins, ABS resins, and acrylic resins; The inorganic filler (B) has a wave number of 4000 to 600 [cm －１ When infrared spectroscopy was performed in the range of 1000 [cm －１ a first inorganic filler (B1) having a maximum absorption intensity in a region where the wave number is 1000 [cm －１ a second inorganic filler (B2) having a maximum absorption intensity in a region where the absorption intensity is less than the first inorganic filler (B1) is a particle composed of silica or calcium carbonate, the second inorganic filler (B2) is composed of a material selected from the group consisting of titanium oxide, iron oxide, and composite oxide pigments; the composite oxide pigment is a pigment containing two or more elements selected from the group consisting of titanium, antimony, nickel, chromium, iron, aluminum, zinc, cobalt, manganese, magnesium, bismuth, and tin; the content of the first inorganic filler (B1) is 0.3 parts by mass or more and 20 parts by mass or less when the content of the thermoplastic resin (A) is 100 parts by mass, The first inorganic filler (B1) has an average particle size of 0.15 μm or more and less than 20 μm, the content of the second inorganic filler (B2) is 0.3 parts by mass or more and 15 parts by mass or less when the content of the thermoplastic resin (A) is 100 parts by mass, A thermoplastic resin composition in which the second inorganic filler (B2) has an average particle size of 5 nm or more and 10 μm or less (however, excluding a thermoplastic resin composition when it is a resin composition for laser marking, a thermoplastic resin composition when it is used to form a foamed molded article, and a thermoplastic resin composition when both the first inorganic filler (B1) and the second inorganic filler (B2) are composited with a fatty acid or a salt thereof).

5. The thermoplastic resin composition according to any one of claims 1 to 4, a thermoplastic resin composition in which the content of the inorganic filler (B) is 1 part by mass or more and 30 parts by mass or less when the content of the thermoplastic resin (A) is 100 parts by mass;

6. The thermoplastic resin composition according to any one of claims 1 to 5, The thermoplastic resin composition, wherein the circularity of the first inorganic filler (B1) is 0.7 or more.

7. The thermoplastic resin composition according to any one of claims 1 to 6, The thermoplastic resin composition, wherein the first inorganic filler (B1) has a Mohs hardness of 2 or more.

8. The thermoplastic resin composition according to any one of claims 1 to 7, The thermoplastic resin composition, wherein the first inorganic filler (B1) is a filler whose surface has been subjected to a hydrophobic treatment.

9. A method for producing a molded body, comprising: A manufacturing method comprising a step of injection molding the thermoplastic resin composition according to any one of claims 1 to 8.

10. A molded body, A molded article obtained by molding the thermoplastic resin composition according to any one of claims 1 to 8.

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