Antistatic transparent resin composition and molded article obtained by molding the antistatic transparent resin composition

Abstract

To provide an antistatic transparent resin composition that offers a balanced combination of transparency, impact resistance and antistatic properties, and a molded article obtained by molding the antistatic transparent resin composition.SOLUTION: An antistatic transparent resin composition includes: 5-50 mass% of an antistatic component (A) including an antistatic agent (a1) with an amide bond; and 50-95 mass% of a polymer component (B) including a styrenic monomer unit (b1), a (meth)acrylate monomer unit (b2), and a (meth)acrylic acid monomer unit (b3).SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to an antistatic transparent resin composition and a molded article obtained by molding the antistatic transparent resin composition. [Background technology]

[0002] Techniques for imparting antistatic properties to styrene-based resins include (1) adding anionic, cationic, amphoteric or nonionic surfactants as antistatic agents, (2) adding carbon black or metal oxides as conductive fillers, and (3) applying an antistatic agent or printing with conductive ink to impart antistatic properties to resin molded products.

[0003] However, method (1) is based on the principle of physically kneading an antistatic agent that has poor compatibility with styrene-based resins and allowing the antistatic agent to seep out to the surface, so the amount of antistatic agent that can be added is limited and the antistatic properties are unstable. Also, method (2) adds a large amount of conductive filler that is black or has a high specific gravity, which causes the transparency and light weight of styrene-based resins to be lost. Furthermore, technology (3) has the disadvantages of requiring additional processes such as coating and printing, and of losing antistatic properties due to surface friction during cleaning and use.

[0004] As a conventional technique for imparting antistatic properties to styrene-based resins other than the above (1) to (3), a resin composition with sustained antistatic properties consisting of a rubber-reinforced styrene-based resin, a polyetheresteramide, and a carboxyl group-containing vinyl-based polymer is known (for example, Patent Document 1). Patent Document 1 relates to a technique of adding a hydrophilic polyetheresteramide as an antistatic agent, and adding a carboxyl group-containing vinyl-based polymer as a compatibilizer to maintain physical properties such as impact strength and moldability and to prevent delamination.

[0005] In contrast, another prior art is an antistatic transparent resin composition comprising a rubber-reinforced styrene-based resin containing a diene-based rubber polymer produced using a bulk-suspension polymerization method, and a polyether ester amide-based antistatic agent using an aliphatic dicarboxylic acid as a constituent component (Patent Document 2). The technology of Patent Document 2 contains a copolymer consisting of a styrene-based monomer and an acrylic acid (methacrylic acid) ester monomer, which is the continuous phase of the rubber-reinforced styrene-based resin, a diene-based rubber, which is the dispersed phase, and a polyether ester amide antistatic agent, and by controlling the refractive index of each to within 0.03, transparency is expressed, and a balance of sustained antistatic properties and physical properties is achieved. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 62-241945 [Patent Document 2] Patent No. 3812965 Summary of the Invention [Problem to be solved by the invention]

[0007] However, the technology of Patent Document 1 does not take transparency into consideration, and is extremely insufficient in terms of achieving a balance between antistatic properties, physical properties, and moldability. In order to maintain high physical properties and moldability, it is necessary to reduce the amount of polyetheresteramide, which results in low antistatic properties, while increasing the amount of polyesteretheramide to improve antistatic properties results in low physical properties and moldability.

[0008] For example, to protect household electrical appliances from dust, the surface resistivity is 10 11 10 to 10 12 If the antistatic property is in the order of Ω, the resin composition will have excellent physical properties and moldability. However, if the surface resistivity is 10 10When antistatic properties of the order of Ω or less are required, the technology of Patent Document 1 inevitably results in a resin composition with inferior physical properties and moldability. In addition, since it has no transparency, it is impossible to visually check the contents or to check them with a sensor, camera, etc.

[0009] In addition, even in the technology of Patent Document 2, the compatibility between antistatic properties and physical properties is still insufficient, and in order to maintain high physical properties, it is necessary to suppress the amount of polyetheresteramide antistatic agent, which results in low antistatic properties. On the other hand, if the amount of polyetheresteramide antistatic agent added to improve antistatic properties is increased, a problem occurs in that mechanical physical properties such as impact resistance are reduced. Therefore, in order to satisfy the properties required for electronic component packaging materials, etc., it is necessary to achieve a higher level of compatibility between antistatic properties and physical properties.

[0010] Therefore, an object of the present disclosure is to provide an antistatic transparent resin composition that has an excellent balance of high transparency, antistatic properties, and impact resistance, and a molded article obtained by molding the antistatic transparent resin composition. [Means for solving the problem]

[0011] The antistatic transparent resin composition of the present disclosure relates to a transparent resin composition in which a styrene-based resin, which is originally insulating, is endowed with a sustained antistatic property, and relates to an antistatic transparent resin composition that combines excellent antistatic property, antistatic property that can be used in various molding methods, impact strength, and a high balance of transparency, which could not be achieved with conventional resin compositions. The resin composition of the present disclosure is preferably used in applications that play a role in electrically and physically protecting the contents, such as packaging materials for electronic parts.

[0012] As a result of extensive research into solving the above problems, the present inventors have completed the present invention.

[0013] [1] The present embodiment is an antistatic transparent resin composition comprising 5 to 50 mass % of an antistatic component (A) containing an antistatic agent (a1) having an amide bond, and 50 to 95 mass % of a polymer component (B) containing a styrene-based monomer unit (b1), a (meth)acrylic acid ester monomer unit (b2), and a (meth)acrylic acid monomer unit (b3).

[0014] [2] In this embodiment, it is desirable that the antistatic transparent resin composition further contains rubber-like polymer particles (C1).

[0015] [3] In the present embodiment, it is preferable that the content of the styrene-based monomer units (b1) is 40 to 98 mass%, the content of the (meth)acrylic acid ester monomer units (b2) is 1 to 59.9 mass%, and the content of the (meth)acrylic acid monomer units (b3) is 0.1 to 20 mass%, based on the entire polymer component (B).

[0016] [4] In this embodiment, the polymer component (B) preferably contains one or more selected from the group consisting of a styrene-based copolymer (B2) having the styrene-based monomer unit (b1) and the (meth)acrylic acid ester monomer unit (b2) and a styrene-based copolymer (B2) having the styrene-based monomer unit (b1) and the (meth)acrylic acid monomer unit (b3).

[0017] [5] In the present embodiment, it is preferable that the styrene-based copolymer (B2) constituting the polymer component (B) further has the (meth)acrylic acid ester monomer unit (b2).

[0018] [6] In this embodiment, the difference between the refractive index of the mixture of the antistatic agent (A) and the styrene-based copolymer (B2) and the refractive index of the styrene-based copolymer (B1) is preferably within 0.03.

[0019] [7] The present embodiment is a molded article using the antistatic resin composition according to any one of [1] to [6].

[0020] [8] This embodiment is a sheet obtained by extrusion molding the antistatic resin composition according to any one of [1] to [6].

[0021] [9] This embodiment is a laminate sheet in which the antistatic resin composition according to any one of [1] to [6] is laminated on one or both sides of a base layer.

[0022]

[10] The present embodiment is a packaging container for electronic parts, which uses the antistatic resin composition according to any one of [1] to [6].

[0023]

[12] This embodiment is a packaging container for electronic components using the sheet described in either [8] or [9].

[0024]

[13] This embodiment is a magazine tube for packaging electronic parts obtained by extrusion molding the antistatic resin composition according to any one of [1] to [6].

[0025]

[14] This embodiment is a tray for packaging electronic parts, which uses the antistatic resin composition according to any one of [1] to [6].

[0026]

[15] This embodiment is a carrier tape using the sheet described in either [8] or [9]. Effect of the Invention

[0027] According to the present invention, it is possible to obtain an antistatic transparent resin composition having an excellent balance of high transparency, antistatic properties and impact resistance, and a molded article using the same. [Brief description of the drawings]

[0028] [Figure 1] FIG. 2 is a schematic diagram showing the state of each component contained in the antistatic resin composition. [Diagram 2] FIG. 1 is a schematic diagram showing a preferred antistatic resin composition of the present embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0029] The following describes in detail an embodiment of the present invention (hereinafter referred to as the "present embodiment"); however, the present invention is not limited to the following description and can be implemented in various modified forms within the scope of its gist.

[0030] [Antistatic transparent grease composition] The antistatic transparent resin composition of the present disclosure contains an antistatic component (A) containing an antistatic agent (a1) having an amide bond, and a polymer component (B). The antistatic transparent resin composition can be prepared by blending, melting, kneading, and granulating the antistatic component (A) and the polymer component (B) in specific amounts. This can provide a resin composition that is excellent in transparency, antistatic properties, and impact strength.

[0031] In the antistatic transparent resin composition of the present embodiment, the antistatic component (A) may contain an antistatic agent (a1) having an amide bond as a main component. More specifically, the antistatic agent (a1) having an amide bond is preferably contained in an amount of 50% by mass or more and 100% by mass or less with respect to the total amount (100% by mass) of the antistatic component (A). In addition, the antistatic component (A) preferably contains the antistatic agent (a1) as an essential component, and if necessary, contains at least one selected from the group consisting of known ionic liquids, ionic surfactants, and lithium ion-based compounds (for example, known lithium salts). When these known ionic liquids, ionic surfactants, and lithium ion-based compounds are contained in the antistatic component (A), the content of each of the ionic liquids, ionic surfactants, and lithium ion-based compounds in the antistatic component (A) is preferably more than 0% by mass and 10% by mass or less, and more preferably more than 0% by mass and 1% by mass or less.

[0032] In the antistatic transparent resin composition of this embodiment, the polymer component (B) may contain a styrene-based monomer unit (b1), a (meth)acrylic acid ester monomer unit (b2), and a (meth)acrylic acid monomer unit (b3), and may be a system in which a plurality of homopolymers are mixed, or a system containing one or more copolymers having a plurality of monomer units. Therefore, the polymer component (B) of this embodiment may be a copolymer having a styrene-based monomer unit (b1), a (meth)acrylic acid ester monomer unit (b2), and a (meth)acrylic acid monomer unit (b3), or may contain one or more polymers having one or more monomer units selected from the group consisting of a styrene-based monomer unit (b1), a (meth)acrylic acid ester monomer unit (b2), and a (meth)acrylic acid monomer unit (b3).

[0033] In this embodiment, the polymer component (B) preferably contains one or more selected from the group consisting of a styrene-based copolymer (B1) having the styrene-based monomer unit (b1) and the (meth)acrylic acid ester monomer unit (b2) and a styrene-based copolymer (B2) having the styrene-based monomer unit (b1) and the (meth)acrylic acid monomer unit (b3). The polymer component (B) may be a mixture, so for example, the polymer component (B) may contain the styrene-based copolymer (B1) and the styrene-based copolymer (B2).

[0034] The antistatic resin composition of this embodiment contains an antistatic component (A) (hereinafter also referred to as component (A)) containing an antistatic agent (a1) having an amide bond, and a polymer component (B) (hereinafter also referred to as component (B)). The polymer component (B) contains styrene-based monomer units (b1), (meth)acrylic acid ester monomer units (b2), and (meth)acrylic acid monomer units (b3).

[0035] By blending a specific antistatic component (A) and a polymer component (B) composed of specific monomer units in combination with the entire antistatic resin composition, it is possible to achieve both excellent transparency, antistatic properties, and impact strength. Each component constituting the antistatic resin composition according to the present invention will be described below.

[0036] "Antistatic ingredient (A)" The antistatic transparent resin composition of the present embodiment contains an antistatic agent (a1) having an amide bond. The antistatic agent (a1) or the antistatic component (A) mainly composed of the antistatic agent (a1) is responsible for the excellent antistatic properties of the entire resin composition of the present disclosure.

[0037] The antistatic component (A) in this embodiment may contain an antistatic agent (a1) having an amide bond, and may contain an antistatic agent (a2) other than the antistatic agent (a1) having an amide bond, a known ionic liquid, or an ionic surfactant. As a suitable antistatic component (A) in this embodiment, the antistatic agent (a1) having an amide bond is preferably contained in an amount of 50% by mass or more and 100% by mass or less based on the total amount (100% by mass) of the antistatic component (A). In other words, the antistatic agent (a1) having an amide bond is preferably contained in an amount of 5% by mass or more and 60% by mass or less based on the total amount (100% by mass) of the antistatic transparent oil composition, more preferably 7% by mass or more and 52% by mass or less, and even more preferably 10% by mass or more and 40% by mass or less.

[0038] The antistatic agent (a1) of the present embodiment is a block copolymer (A1) having a soft segment and a hard segment, more specifically, a polyetheramide block copolymer (A1-1) (hereinafter also simply referred to as block copolymer (A1-1)) having a polyoxyalkylene block (or also referred to as polyether block) which is a soft segment and an amide block which is a hard segment, or a polyetheresteramide block copolymer (A1-2) (hereinafter also simply referred to as block copolymer (A1-2)) having the ether block, the amide block and an ester block. In the polyether block, environmental moisture absorption, ionic dissociation of water, and ionic conduction of protons occur, dissipating static electricity and attenuating the charged voltage, so that the antistatic transparent resin composition of the present invention as a whole exhibits sustained antistatic properties.

[0039] As the antistatic agent (a1) having an amide bond of this embodiment, for example, the antistatic agent (a1) consisting of a polyetheresteramide block copolymer (A1-2) can be a copolymer in which a (poly)ester block having a reactive group at the end, a polyether block having a polyoxyalkylene as the main structure, and an amide block having an amide bond having a reactive group at the end are repeatedly and alternately bonded. The antistatic agent (a1) of this embodiment can be a synthetic product or can be appropriately selected from those available in general.

[0040] In particular, when the antistatic agent (a1) has an amide bond, the impact resistance and transparency of the entire antistatic transparent resin composition are improved.

[0041] In this embodiment, the antistatic agent (a1) may be prepared by blending one type of block copolymer (A1) or may be prepared by blending multiple types of block copolymers (A1). In this case, the antistatic agent (a1) preferably contains at least one type of block copolymer (A1) having an amide bond.

[0042] The antistatic agent (a1) of the present embodiment preferably contains an amide bond and a polyether block skeleton in the molecule and has a water absorption rate of 10 to 150% by mass. The content of the polyether block skeleton is preferably 10 to 90% by mass based on the entire molecule of the antistatic agent (a1).

[0043] The antistatic agent (a1) of the present embodiment is preferably a block copolymer (A1) having a polyether block as a soft segment and an amide block as a hard segment. The block copolymer (A1) is preferably at least one selected from the group consisting of polyetheramide block copolymers (A1-1) and polyetheresteramide block copolymers (A1-2).

[0044] A preferred block copolymer (A1) of this embodiment has a soft segment represented by the following (I) and a hard segment represented by the following (III), and optionally further has a structural unit represented by the following (II).

[0045] [ka] (In the above general formula (I), M 1 each independently represents an alkylene group having 1 to 8 carbon atoms, and m represents the degree of polymerization.

[0046] (In the above general formula (II), M 2 represents a divalent organic group, L 1 and L 2 are each independently -C(=O)-O-, -C(=O)-, -O-, -OC(=O)-, -C(=O)-NR 1 -, -NR 2 -C(=O)- or -NR 3 - represents R 1 , R 2 and R 3 each independently represents a hydrogen atom or an alkyl group having 1 to 3 carbon atoms (for example, a methyl group, an ethyl group, a propyl group, an isopropyl group), and 1 represents the degree of polymerization.

[0047] (In the above general formula (III), M 3 represents a divalent organic group, L 3 and L 4 are each independently -C(=O)-O-, -C(=O)-, -O-, -OC(=O)-, -C(=O)-NR 1 -, -NR 2 -C(=O)- or -NR 3 -, n represents the degree of polymerization, R 1 , R 2 and R 3 each independently represents a hydrogen atom or an alkyl group having 1 to 3 carbon atoms (e.g., a methyl group, an ethyl group, a propyl group, an isopropyl group). In the above general formula (I), the alkylene group may be any one of linear, branched, or cyclic, and examples thereof include a methylene group, an ethylene group, a propylene group, a 1-methylmethylene group, a 1,1-dimethylmethylene group, a 1-methylethylene group, a 1,1-dimethylethylene group, a 1,2-dimethylethylene group, an isopropylene group, an isopropylidene group, a propylidene group, a butylene group, a 1-methylpropylene group, a 2-methylpropylene group, a pentylene group, a hexylene group, a heptylene group, and an octylene group.

[0048] In the above general formula (I), the degree of polymerization m represents an integer of 1 or more and 400 or less, preferably an integer of 5 or more and 380 or less, and more preferably an integer of 10 or more and 290 or less.

[0049] In the above general formula (II), examples of the divalent organic group include a divalent aromatic group obtained by removing two hydrogen atoms from a group having an aromatic ring, or a divalent aliphatic hydrocarbon group, and a divalent aromatic group is preferable.

[0050] The divalent aromatic group preferably has an aromatic ring and has 3 to 25 carbon atoms. The aromatic group may contain a heteroaromatic group, and may be substituted with -O-, -S-, or -N= so that -CH2- or -CH= in the aromatic group are not adjacent to each other. The aromatic ring may further include a monocyclic aromatic ring, a condensed aromatic ring, and a ring assembly aromatic ring. Examples of the monocyclic aromatic ring include benzene, furan, pyrrole, thiophene, imidazole, pyrazole, oxazole, isoxazole, thiazole, pyridine, pyrimidine, pyridazine, pyrazine, and triazine. Examples of the condensed aromatic ring include naphthalene, anthracene, phenalene, phenanthrene, quinoline, isoquinoline, quinazoline, phthalazine, pteridine, coumarin, indole, benzimidazole, benzofuran, and acridine. Examples of the aromatic ring assembly include biphenyl, binaphthalene, bipyridine, bithiophene, phenylpyridine, phenylthiophene, terphenyl, diphenylthiophene, quaterphenyl, etc. Furthermore, a hydrogen atom of the aromatic ring may be substituted with, for example, an alkyl group having 1 to 12 carbon atoms, an alkoxy group having 1 to 12 carbon atoms, or a halogen atom.

[0051] Preferred M in the above general formula (II) 2 Examples of the alkylene group include an alkylene group having 1 to 20 carbon atoms, an alkenylene group having 2 to 18 carbon atoms, an alkoxylene group having 1 to 18 carbon atoms, an arylene group having 6 to 20 carbon atoms, and an aralkylene group having 7 to 21 carbon atoms.

[0052] The alkylene group may be linear, branched, or cyclic, and examples of the alkylene group include a methylene group, an ethylene group, a propylene group, a 1-methylmethylene group, a 1,1-dimethylmethylene group, a 1-methylethylene group, a 1,1-dimethylethylene group, a 1,2-dimethylethylene group, an isopropylene group, an isopropylidene group, a propylidene group, a butylene group, a 1-methylpropylene group, a 2-methylpropylene group, a pentylene group, a hexylene group, a heptylene group, an octylene group, a nonylene group, a decylene group, an undecylene group, and a dodecylene group.

[0053] Examples of the alkenylene group include a 1-propynylene group, a 2-propynylene group, an isopropenylene group, a 2-butynylene group, a pentynylene group, a hexynylene group, and a vinylene group.

[0054] The alkoxysilane group may be a group in which any one hydrogen atom has been removed from an alkoxy group selected from the group consisting of a methoxy group, an ethoxy group, a propoxy group, an isopropoxy group, a butoxy group, a pentyloxy group, a hexyloxy group, a 2-ethylhexyloxy group, an octyloxy group, and a nonyloxy group.

[0055] The arylene group includes a group in which any one hydrogen atom has been removed from an aryl group selected from the group consisting of a phenyl group, a naphthyl group, a phenalenyl group, a phenanthrenyl group, an anthryl group, an azulenyl group, an indenyl group, and an indanyl group, and a phenylene group is particularly preferred.

[0056] The aralkylene group includes an aralkyl group selected from the group consisting of a benzyl group, a diphenylmethyl group, a biphenyl group, and a naphthylmethyl group, from which any one hydrogen atom has been removed.

[0057] In the above general formula (II), the degree of polymerization 1 represents an integer of 1 or more and 100 or less, preferably an integer of 1 or more and 90 or less, and more preferably an integer of 1 or more and 80 or less.

[0058] Particularly preferred M in the above general formula (II) 2 The alkyl group may be an arylene group having 6 to 12 carbon atoms.

[0059] L in the above general formula (II) 1 -C(=O)-O-, -OC(=O)-, -C(=O)-NR 1 -OR-NR 2 It is preferred that it is -C(=O)-.

[0060] L in the above general formula (III) 2are -C(=O)-O-, -OC(=O)-, -C(=O)-NR 1 -OR-NR 2 It is preferred that it is -C(=O)-.

[0061] In the above general formula (II), L 1 and L 2 may be the same as or different from each other.

[0062] In the above general formula (III), examples of the divalent organic group include a divalent aromatic group obtained by removing two hydrogen atoms from a group having an aromatic ring, and a divalent aliphatic hydrocarbon group. Examples of the divalent aromatic group and the divalent aliphatic hydrocarbon group are as described above.

[0063] Preferred M in the above general formula (III) 3 Examples of the alkylene group include an alkylene group having 1 to 25 carbon atoms, an alkenylene group having 2 to 18 carbon atoms, an alkoxylene group having 1 to 18 carbon atoms, an arylene group having 6 to 20 carbon atoms, and an aralkylene group having 7 to 21 carbon atoms. An alkylene group having 3 to 25 carbon atoms is more preferable, a linear alkylene group having 4 to 20 carbon atoms is even more preferable, and a linear alkylene group having 5 to 19 carbon atoms is even more preferable.

[0064] L in the above general formula (III) 3 is preferably -C(=O)-, -C(=O)-NH-, -NH-C(=O)- or -NH-.

[0065] L in the above general formula (III) 4 is preferably -C(=O)-, -C(=O)-NH-, -NH-C(=O)- or -NH-.

[0066] In the above general formula (III), L 3 and L 4 may be the same as or different from each other.

[0067] In the above general formula (III), the degree of polymerization n represents an integer of 1 or more and 200 or less, preferably an integer of 7 or more and 160 or less, and more preferably an integer of 10 or more and 140 or less.

[0068] The block copolymer (A1) of the present embodiment may be a copolycondensation product of an amide block as a hard segment and a polyoxyalkylene block having a terminal having a functional group as a soft segment. In other words, the block copolymer (A1) of the present embodiment is a copolycondensation product using, as reaction raw materials, an amide block (=(poly)amide polymer) having a first functional group (e.g., hydroxyl group, amino group, carboxylic acid group) at at least one terminal and a polyoxyalkylene block (=polyether polymer) having a second functional group (e.g., hydroxyl group, amino group, carboxylic acid group) capable of polycondensing with the first functional group at at least one terminal. A preferred embodiment of the block copolymer (A1) of the present embodiment is a copolycondensate obtained by using, as reaction raw materials, an amide block (=(poly)amide polymer) having a first functional group (e.g., a hydroxyl group, an amino group, a carboxylic acid group) at least at one end, a polyoxyalkylene block (=polyether polymer) having a second functional group (e.g., a hydroxyl group, an amino group, a carboxylic acid group) capable of polycondensing with the first functional group at at least one end, and an ester block (=(poly)ester polymer) having a third functional group (e.g., a hydroxyl group, an amino group, a carboxylic acid group) at at least one end.

[0069] The block copolymer (A1) of this embodiment is preferably, for example, a copolycondensate (1) having an amide block (=(poly)amide polymer) containing a diamine chain end and a polyoxyalkylene block (=polyether polymer) having a carboxylic acid group end, a copolycondensate (2) having an amide block (=(poly)amide polymer) having a dicarboxylic acid end and a polyoxyalkylene block (=polyether polymer) having a diamine end obtained by cyanoethylation and hydrogenation of an aliphatic dihydroxylated α-ω polyoxyalkylene known as a polyether diol, or a copolycondensate (3) of an amide block (=(poly)amide polymer) having a dicarboxyl group end and a polyether diol (=polyether polymer). The copolycondensate (3) is a polyether ester amide copolymer (A1-2).

[0070] The reactants for the dicarboxylic acid-terminated amide block (eg, polyamide 12 or polyamide 6) can be, for example, an α,ω-aminocarboxylic acid compound in the presence of a dicarboxylic acid compound, a lactam compound, or a dicarboxylic acid compound and a diamine compound.

[0071] The α,ω-amino carboxylic acid compounds include amino undecanoic acid and amino dodecanoic acid. The lactam compounds include caprolactam and lauryllactam. The dicarboxylic acid compounds include adipic acid, sebacic acid, isophthalic acid, butanedioic acid, 1,4-cyclohexyl dicarboxylic acid, terephthalic acid, sodium sulfoisophthalate, decanedioic acid and dodecanedioic acid. The diamine compounds include hexamethylenediamine, piperazine, 1-aminoethylpiperazine, bisamino-propylpiperazine, tetramethylenediamine, octamethylenediamine, decamethylenediamine, dodecamethylenediamine, 1,5-diaminohexane, 2,2,4-trimethyl-1,6-diaminohexane, diaminepyrroles, isophoronediamine (IPD), methylpentamethylenediamine (MPDM), bis(aminocyclohexyl)methane (BACM), and bis(3-methyl-4-aminocyclohexyl)methane (BMACM).

[0072] Another aspect of the block copolymer (A1) of the present embodiment is preferably a polycondensate obtained by polycondensing one compound (=polyether block) selected from the group consisting of diol compounds having a polyoxyalkylene group and diamine compounds having a polyoxyalkylene group, and an amide block having two or more carboxyl groups in one molecule, and more preferably a polycondensate having one compound (=polyether block) selected from the group consisting of diol compounds having a polyoxyalkylene group and diamine compounds having a polyoxyalkylene group, an amide block having two or more carboxyl groups in one molecule, and a diol compound having an ester group (=ester block).

[0073] The polyoxyalkylene block (=polyether polymer) of the block copolymer (A1) of this embodiment is preferably composed of a diol compound having a polyoxyalkylene group (a polyether compound having hydroxyl groups at both ends) or a diamine compound having an oxyalkylene group (a polyether compound having amino groups at both ends). In other words, the polyether block (=polyether polymer) of the block copolymer (A1) of this embodiment is a polymer made from a diol compound or a diamine compound having an oxyalkylene group as a reaction raw material.

[0074] The diol compound having a polyoxyalkylene group may be a compound in which an alkylene oxide is added to a glycol, a dihydric phenol, an amine compound, or a dicarboxylic acid compound. In other words, the diol compound having a polyoxyalkylene group may be a compound in which a glycol, a dihydric phenol, an amine compound, or a dicarboxylic acid compound and an alkylene oxide are reacted as raw materials. The addition may be carried out by a known method. For example, the addition may be carried out in one or multiple stages (at normal pressure or under pressure) without a catalyst or in the presence of a catalyst (alkali catalyst, amine catalyst, or acid catalyst).

[0075] The diamine compound having a polyoxyalkylene group can be a compound obtained by modifying the terminal hydroxyl group of the diol compound having a polyoxyalkylene group to an amino group.The method for modifying the terminal hydroxyl group of the diol compound having a polyoxyalkylene group to an amino group can be a known method.For example, the method of reducing the terminal cyanoalkyl group obtained by cyanoalkylating the terminal hydroxyl group of the diol compound having a polyoxyalkylene group to aminoalkylate can be mentioned.

[0076] A preferred diol compound having a polyoxyalkylene group in this embodiment is an adduct obtained by adding one selected from the group consisting of ethylene oxide, propylene oxide, butylene oxide (1,2-, 2,3- or 1,3-), tetrahydrofuran, styrene oxide, α-olefin oxide, and epichlorohydrin to one selected from the group consisting of aliphatic glycols, dihydric phenols, and aliphatic dicarboxylic acids. In other words, a preferred diol compound having a polyoxyalkylene group in this embodiment is an adduct obtained by adding one selected from the group consisting of aliphatic glycols, dihydric phenols, and aliphatic dicarboxylic acids to one selected from the group consisting of ethylene oxide, propylene oxide, butylene oxide (1,2-, 2,3- or 1,3-), tetrahydrofuran, styrene oxide, α-olefin oxide, and epichlorohydrin as reaction raw materials.

[0077] Preferred forms of the aliphatic glycol, dihydric phenol and aliphatic dicarboxylic acid may be ethylene glycol, diethylene glycol, propylene glycol, butanediol, hydroquinone, bisphenol A, bisphenol S and adipic acid.

[0078] In this embodiment, the amide block having two or more carboxyl groups in one molecule may be the above-mentioned amide block having a dicarboxyl group terminal (=(poly)amide polymer). In addition, the other amide block having two or more carboxyl groups in one molecule is preferably one or more dicarboxylic acid derivatives selected from the group consisting of polyamides and polyamideimides having carboxyl groups at both ends.

[0079] The dicarboxylic acid derivative can be prepared by using a dicarboxylic acid compound as a regulator and subjecting an amide bond-forming monomer to ring-opening polymerization or polycondensation of an amide bond-forming monomer and the dicarboxylic acid compound.

[0080] Examples of the dicarboxylic acid compound include aliphatic dicarboxylic acids such as oxalic acid, malonic acid, succinic acid, glutaric acid, methylsuccinic acid, dimethylmalonic acid, β-methylglutaric acid, ethylsuccinic acid, isopropylmalonic acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, undecanediacid, dodecanediacid, tridecanediacid, tetradecanediacid, hexadecanedioic acid, octadecanedioic acid, and icosanediacid; Aromatic dicarboxylic acids such as terephthalic acid, isophthalic acid, phthalic acid, phenylmalonic acid, homophthalic acid, phenylsuccinic acid, β-phenylglutaric acid, α-phenyladipic acid, β-phenyladipic acid, biphenyl-2,2'-dicarboxylic acid, biphenyl-4,4'-dicarboxylic acid, naphthalenedicarboxylic acid, sodium 3-sulfoisophthalate, and potassium 3-sulfoisophthalate; Examples of the alicyclic dicarboxylic acids include 1,3-cyclopentanedicarboxylic acid, 1,2-cyclopentanedicarboxylic acid, 1,4-cyclohexanedicarboxylic acid, 1,2-cyclohexanedicarboxylic acid, 1,3-cyclohexanedicarboxylic acid, 1,4-cyclohexanediacetic acid, 1,3-cyclohexanediacetic acid, 1,2-cyclohexanediacetic acid, and dicyclohexyl-4,4-dicarboxylic acid.

[0081] The amide bond forming monomer includes a lactam compound, an aminocarboxylic acid compound, and a diamine compound. Examples of the lactam compound include γ-butyrolactam, γ-valerolactam, ε-caprolactam, γ-pimelolactam, γ-caprylolactam, γ-decanolactam, enantholactam, laurolactam, undecanolactam, eicosanolactam, and 5-phenyl-2-piperidone.

[0082] Examples of the aminocarboxylic acid include glycine, alanine, ω-aminocaproic acid, ω-aminoenanthic acid, ω-aminocaprylic acid, ω-aminopergonic acid, ω-aminocapric acid, 11-aminoundecanoic acid, 12-aminododecanoic acid, and 20-aminoeicosanoic acid.

[0083] Examples of the diamine compound include ethylenediamine, hexamethylenediamine, heptamethylenediamine, octamethylenediamine, decamethylenediamine, eicosanediamine, xylylenediamine, and cyclohexyldiamine.

[0084] The block copolymer (A1) of the present embodiment may be a polyetheresteramide block copolymer (A1-2) having one compound (=polyether block) selected from the group consisting of the above-mentioned diol compounds having a polyoxyalkylene group and diamine compounds having a polyoxyalkylene group, the above-mentioned amide block having two or more carboxyl groups in one molecule, and the above-mentioned ester block having two or more carboxyl groups in one molecule.

[0085] The ester block having two or more carboxyl groups in one molecule of the present embodiment may be a diol compound having an ester group. The diol compound having an ester group may have a structure obtained by polycondensing an ester block-forming monomer described below by a known method or by subjecting it to an ester exchange reaction using the dicarboxylic acid compound as a regulator.

[0086] Examples of the ester block-forming monomer include a combination of one or more selected from the dicarboxylic acid compounds and dicarboxylic ester compounds and one or more selected from the alcohol compounds and phenol compounds; the lactone compounds; hydroxycarboxylic acid compounds; and mixtures thereof.

[0087] The dicarboxylate compound is preferably an ester (methyl ester, ethyl ester, butyl ester, or phenyl ester) of one or more carboxylic acids selected from the group consisting of adipic acid, sebacic acid, icosanoic acid, terephthalic acid, isophthalic acid, phthalic acid, 1,4-cyclohexanedicarboxylic acid, sodium 3-sulfoisophthalate, dimethyl carbonate, diphenyl carbonate, dimethyl adipate, dimethyl terephthalate, dimethyl isophthalate, dimethyl 1,4-cyclohexanedicarboxylate, sodium 3-dimethylsulfoisophthalate, and sodium 3-diethylsulfoisophthalate.

[0088] Examples of the alcohol compound include ethylene glycol, propylene glycol, butanediol, neopentyl glycol, 1,6-hexanediol, cyclohexanediol, polyethylene glycol, polypropylene glycol, and polytetramethylene glycol. Examples of the phenol compound include hydroquinone, bisphenol A, and bisphenol S.

[0089] Examples of the hydroxycarboxylic acid compound include hydroxyacetic acid, lactic acid, ω-hydroxycaproic acid, ω-hydroxyenanthic acid, ω-hydroxycaprylic acid, ω-hydroxypergonic acid, ω-hydroxycapric acid, 11-hydroxyundecanoic acid, 12-hydroxydodecanoic acid, and 20-hydroxyeicosanoic acid.

[0090] The "water absorption rate" in this specification is a value obtained by the following method in accordance with ASTM-D570. The "water absorption rate" is measured by measuring the mass (W1) of a test piece (100 x 100 x 2 mm) that has been dried at 50°C for 24 hours in advance, and the mass (W2) of the test piece after immersing the test piece in ion-exchanged water at 23°C for 24 hours and wiping off any water on the test piece with a cloth, and then calculating the water absorption rate from the following formula.

[0091] Water absorption rate (%)=[(W2)-(W1)]×100 / (W1) The above test pieces are prepared using a normal injection molding machine [PS40E5ASE, manufactured by Nissei Plastic Industrial Co., Ltd.] at a specified cylinder temperature of 180°C and mold temperature of 50°C.

[0092] The water absorption rate of the antistatic agent (a1) of the present embodiment is preferably from 10 to 150% by mass, more preferably from 20 to 100% by mass, and further preferably from 30 to 90% by mass.

[0093] In this embodiment, the number average molecular weight (Mn) of the amide block is preferably 300 to 15000. The number average molecular weight (Mn) of the polyether block is preferably 100 to 6000. The number average molecular weight (Mn) of the ester block is preferably 150 to 15000.

[0094] The content of the polyether block in the block copolymer (A1) in this embodiment is 9% by mass to 50% by mass based on the total amount of the block copolymer (A1).

[0095] The content of the amide block in the block copolymer (A1) in this embodiment is 90% by mass to 30% by mass based on the total amount of the block copolymer (A1).

[0096] The content of the ester block in the block copolymer (A1) in this embodiment is 1 mass % to 50 mass % based on the total amount of the block copolymer (A1).

[0097] "Method for producing block copolymer (A1)" The block copolymer (A1) of the present embodiment can be produced by a known method, for example, the following method.

[0098] An amide compound having a carboxyl group at the terminal is prepared by reacting a carboxylic acid compound containing two or more carboxylic acid groups with a monomer that forms an amide bond, and, if necessary, a monomer that forms an ester bond.

[0099] A diol compound and / or a diamine compound having an oxyalkylene group is added to the amide compound, and a polymerization reaction is carried out at high temperature (200 to 245° C.) and reduced pressure (1 mmHg or less) to synthesize a polyetheramide block copolymer (A1).

[0100] The antistatic agent of the present embodiment can be produced by kneading the block copolymer (A1) and, if necessary, for example, an ionic liquid or an ionic surfactant.

[0101] Among the polymerization reactions in the above-mentioned production method, the polyesterification reaction usually uses an esterification catalyst.

[0102] Examples of the esterification catalyst include protonic acids (phosphoric acid, etc.), organic acid salts (acetic acid, etc.), carbonates, sulfates, phosphates, oxides, chlorides, hydroxides, and alkoxides of metals [alkali metals (sodium, potassium, etc.), alkaline earth metals (calcium, magnesium, etc.), transition metals (nickel, iron, cobalt, etc.), IIB metals (zinc, etc.), IVB metals (titanium, zirconium, etc.), and VB metals (vanadium, etc.)].

[0103] The surface resistivity (Ω / sq.) of the antistatic transparent grease composition of this embodiment is 1×10 7 ~1×10 14 (Ω / sq.), and more preferably 1×10 8 ~1×10 13 (Ω / sq.), and more preferably 1×10 8 ~1×10 12 (Ω / sq.).

[0104] The volume resistivity (Ω·cm) of the antistatic transparent grease composition of the present embodiment is 1×10 7 ~1×10 14 (Ω cm), and more preferably 1×10 8 ~1×10 13 (Ω cm), and more preferably 1×10 8 ~1×10 12 (Ω cm).

[0105] The surface resistivity (Ω / sq.) and volume resistivity (Ω·cm) of the antistatic transparent grease composition of this embodiment were measured by preparing a test piece according to the method described in the Examples section.

[0106] The refractive index (27° C.) of the antistatic transparent oil composition of this embodiment is preferably greater than 1.510, more preferably greater than 1.510 and not greater than 1.580, and even more preferably 1.520 or greater and not greater than 1.570.

[0107] When the refractive index of the antistatic transparent resin composition of this embodiment is 1.510 or less, the antistatic agent (a1) and the antistatic component (A) tend to be uniformly dispersed in the polymer component (B) in the antistatic transparent resin composition.

[0108] In particular, in an antistatic transparent grease composition obtained by mixing equivalent amounts of a polyetheramide block copolymer (A1-1) or a polyetheresteramide block copolymer (A1-2) as the antistatic component (A) and a terpolymer having a styrene-based monomer unit (b1), a (meth)acrylic acid ester monomer unit (b2), and a (meth)acrylic acid monomer unit (b3) as the polymer component (B), it was confirmed that the terpolymer and the antistatic component (A) form a mutually compatible phase. As a result, since the two are mutually compatible, even if the difference in refractive index between the two is large, the antistatic transparent grease composition as a whole can maintain extremely high transparency. On the other hand, when a binary copolymer of styrene-based monomer unit (b1) and (meth)acrylic acid ester monomer unit (b2) and a binary copolymer of styrene-based monomer unit (b1) and (meth)acrylic acid monomer unit (b3) were used instead of the terpolymer as the polymer component (B), the polymer component (B) contained the same monomer units as the terpolymer, but even when polyether amide block copolymer (A1-1) or polyether ester amide block copolymer (A1-2) was mixed as the antistatic component (A), they did not reach a mutually compatible state. As a result, the system in which the two types of binary copolymers and the antistatic component (A) were mixed showed inferior transparency as the entire antistatic transparent resin composition compared to the system of the terpolymer and the antistatic component (A).

[0109] The refractive index of the antistatic transparent oil composition of the present embodiment was measured by preparing a test piece and measuring it according to the method described in the Examples section.

[0110] In the antistatic transparent resin composition of the present embodiment, the upper limit of the content of the antistatic agent (a1) is preferably 50.00% by mass or less, or 40.00% by mass or less, based on 100% by mass of the total amount of the antistatic transparent resin composition. On the other hand, the lower limit of the content of the antistatic agent (a1) is preferably 5% by mass or more, 10% by mass or more, 13% by mass or more, 15% by mass or more, 18% by mass or more, 20% by mass or more, 25% by mass or more, or 30% by mass or more, based on 100% by mass of the total amount of the antistatic transparent resin composition. The upper and lower limits of the content of the antistatic agent (a1) can be arbitrarily combined.

[0111] In the antistatic transparent oil composition of the present embodiment, the content of the antistatic agent (a1) is preferably 5% by mass or more and 50% by mass or less, more preferably 8% by mass or more and 40% by mass or less, and even more preferably 10% by mass or more and 30% by mass or less, based on 100% by mass of the total amount of the antistatic transparent oil composition. By making the content 5% by mass or more, it is possible to improve the antistatic property and impact resistance while maintaining the high transparency of the composition. In addition, by making the content 50% by mass or less, it is possible to further improve the transparency.

[0112] In the antistatic transparent oil composition of the present embodiment, the upper limit of the content of the antistatic agent (a2) is preferably 10% by mass or less, 5% by mass or less, 3% by mass or less, or 1% by mass or less, based on 100% by mass of the total amount of the antistatic transparent oil composition. On the other hand, the lower limit of the content of the antistatic agent (a2) is preferably 0% by mass or more, 0.1% by mass or more, 0.2% by mass or more, 0.3% by mass or more, 0.4% by mass or more, or 0.5% by mass or more, based on 100% by mass of the total amount of the antistatic transparent oil composition. The upper and lower limits of the content of the antistatic agent (a2) can be arbitrarily combined.

[0113] In the antistatic transparent oil composition of the present embodiment, the content of the antistatic agent (a2) is preferably 0% by mass or more and 5% by mass or less, more preferably 0.1% by mass or more and 3% by mass or less, and even more preferably 0.2% by mass or more and 2% by mass or less, based on 100% by mass of the total amount of the antistatic transparent oil composition. By making the content 0.2% by mass or more, it is possible to improve the antistatic property and impact resistance while maintaining the high transparency of the composition. In addition, by making the content 2% by mass or less, it is possible to further improve the transparency.

[0114] <Ionic liquid> The antistatic component (A) of the present embodiment may contain an ionic liquid. The ionic liquid is not particularly limited, and examples thereof include ionic liquids having the following imidazolium cation, pyrrolidinium cation, ammonium cation, pyridinium cation, piperidinium cation, or other cations.

[0115] Specific examples of the ionic liquid include imidazolium cation-containing ionic liquids such as 1-hexyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (HMIm(TFSI)), 1-ethyl-3-propylimidazolium bis(trifluoromethylsulfonyl)imide (EPIm(TFSI)), 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (EMIm(TFSI)), 1,2-dimethyl-3-propylimidazolium bis(trifluoromethylsulfonyl)imide (MMIm(TFSI)), 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (BMIm(TFSI)), and 1-methyl-3-propylimidazolium bis(trifluoromethylsulfonyl)imide (MPIm(TFSI)); pyrrolidinium cation-containing ionic liquids such as 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide (EMPy(TFSI)), 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide (BMPy(TFSI)), and 1-butyl-1-methylpyrrolidinium tetrafluoroborate; ammonium cation-containing ionic liquids such as butyltrimethylammonium bis(trifluoromethylsulfonyl)imide, trimethylpropylammonium bis(trifluoromethylsulfonyl)imide, and methyltrioctylammonium bis(trifluoromethylsulfonyl)imide; and other ionic liquids such as triethylpentylphosphonium bis(trifluoromethylsulfonyl)imide, trihexyltetradecylphosphonium bis(trifluoromethylsulfonyl)imide, and triethylsulfonium bis(trifluoromethylsulfonyl)imide.

[0116] <Ionic surfactants> The antistatic component (A) of the present embodiment may contain an ionic surfactant. The ionic surfactant is not particularly limited, and may be a cationic surfactant or an anionic surfactant.

[0117] Specific examples of the ionic surfactant include cationic surfactants such as quaternary ammonium salts (lauryltrimethylammonium, stearyltrimethylammonium, octadecyltrimethylammonium, dodecyltrimethylammonium, hexadecyltrimethylammonium, modified fatty acid dimethylethylammonium, etc.), perchlorates, chlorates, hydrofluoric acid salts, ethosulfate salts, and benzyl halide salts (benzyl bromide salts and benzyl chloride salts); and anionic surfactants such as aliphatic sulfonates, higher alcohol sulfate salts, higher alcohol ethylene oxide adduct sulfate salts, higher alcohol phosphate salts, and higher alcohol ethylene oxide adduct phosphate salts.

[0118] "Polymer component (B)" The polymer component (B) of this embodiment contains styrene-based monomer units (b1), (meth)acrylic acid ester monomer units (b2), and (meth)acrylic acid monomer units (b3). As described above, the polymer component (B) of this embodiment may be a polymer component (B) in a composition that contains the styrene monomer unit (b1), the (meth)acrylic acid ester monomer unit (b2), and the (meth)acrylic acid monomer unit (b3). Therefore, the polymer component (B) may be a system in which multiple homopolymers are mixed, or a system containing one or more copolymers having multiple monomer units, or a component in which one or more homopolymers are mixed with one or more copolymers having multiple monomer units.

[0119] Therefore, the polymer component (B) in this embodiment may be a ternary or higher copolymer having a styrene-based monomer unit (b1), a (meth)acrylic acid ester monomer unit (b2), and a (meth)acrylic acid monomer unit (b3), or may contain one or more polymers having one or more monomer units selected from the group consisting of a styrene-based monomer unit (b1), a (meth)acrylic acid ester monomer unit (b2), and a (meth)acrylic acid monomer unit (b3).

[0120] In the antistatic transparent resin composition of this embodiment, the polymer component (B) is contained in an amount of 50 mass% or more and 95 mass% or less, preferably 55 mass% or more and 90 mass% or less, more preferably 60 mass% or more and 87 mass% or less, and even more preferably 65 mass% or more and 85 mass% or less, based on the entire antistatic transparent composition. When emphasis is placed on improving the antistatic properties and impact resistance while maintaining the high transparency of the composition, the content of the polymer component (B) is preferably 60% by mass or less based on the total mass of the antistatic transparent composition. When emphasis is placed on further improving the transparency, the content of the polymer component (B) is preferably 85% by mass or more based on the total mass of the antistatic transparent composition.

[0121] The antistatic transparent resin composition of the present embodiment may further contain rubber-like polymer particles (C1) described below in addition to the polymer component (B).

[0122] In the polymer component (B) of this embodiment, it is preferable that the styrene monomer unit (b1) is 40 to 98 mass%, the (meth)acrylic acid ester monomer unit (b2) is 1 to 59.9 mass%, and the (meth)acrylic acid monomer unit (b3) is 0.1 to 20 mass%. In this case, as described above, it is sufficient that the styrene monomer unit (b1), the (meth)acrylic acid ester monomer unit (b2), and the (meth)acrylic acid monomer unit (b3) are present as the polymer component (B) in the composition within the above content ranges.

[0123] Preferred embodiments of the styrene-based monomer unit (b1), the (meth)acrylic acid ester monomer unit (b2), the (meth)acrylic acid monomer unit (b3), and the polymer component (B), which are the components of the polymer component (B), will be described below.

[0124] <Styrene-based monomer unit (b1)> In this embodiment, the styrene-based monomer (b1) that can constitute the polymer component (B) is not particularly limited, but examples thereof include styrene, α-methylstyrene, paramethylstyrene, ethylstyrene, propylstyrene, butylstyrene, chlorostyrene, bromostyrene, etc. Styrene is particularly preferred from an industrial viewpoint. As the styrene-based monomer, these can be used alone or in combination.

[0125] In this specification, the term "styrene monomer unit (b1)" refers to a repeating unit derived from a styrene monomer (b1), and more specifically, refers to a structural unit in which the unsaturated double bond in the styrene monomer (b1) is converted to a single bond through a polymerization reaction or a crosslinking reaction of the styrene monomer (b1). The other "monomer units" have the same meaning as above.

[0126] In this embodiment, the content of the styrene-based monomer unit (b1) in the entire polymer component (B) is, for example, preferably 40 to 98 mass%, more preferably 30 to 90 mass%, and even more preferably 40 to 80 mass%, based on the entire polymer component (B), from the viewpoint of improving the antistatic property and impact resistance while maintaining high transparency of the entire antistatic transparent resin composition.

[0127] In this embodiment, the contents of the styrene-based monomer unit (b1), the (meth)acrylic acid ester monomer unit (b2), the (meth)acrylic acid monomer unit (b3) and other monomer units in the polymer component (B) or the antistatic transparent resin composition are measured by subjecting a styrene-based copolymer to a nuclear magnetic resonance measurement apparatus ( 1 It can be calculated from the integral ratio of the spectrum measured by 1 H-NMR.

[0128] <(Meth)acrylic acid ester monomer unit (b2)> In this embodiment, the (meth)acrylic acid ester monomer unit (b2) is preferably a (meth)acrylic acid ester monomer unit (b2) having an alkyl chain having 1 to 6 carbon atoms as an ester substituent. In this case, the alkyl chain having 1 to 6 carbon atoms includes a linear, branched or cyclic alkyl group. The alkyl chain having 1 to 6 carbon atoms is preferably a linear or branched alkyl group, and examples of the alkyl chain having 1 to 6 carbon atoms include a methyl group, an ethyl group, a propyl group, an isopropyl group, an n-butyl group, a t-butyl group, an s-butyl group and an isobutyl group.

[0129] In the present embodiment, the (meth)acrylic acid ester monomer unit (b2) may be, for example, CH2=C(R 1 )-COO-R 2 where R 1 is a hydrogen atom or a methyl group, R 2 is an ester substituent, preferably an alkyl chain having 1 to 6 carbon atoms.

[0130] In this embodiment, specific examples of the (meth)acrylic acid ester monomer unit (b2) include methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, isopropyl (meth)acrylate, n-butyl (meth)acrylate, s-butyl (meth)acrylate, isobutyl (meth)acrylate, t-butyl (meth)acrylate, etc. Among these, from an industrial viewpoint, the (meth)acrylic acid ester monomer is preferably methyl (meth)acrylate, n-butyl (meth)acrylate, s-butyl (meth)acrylate, isobutyl (meth)acrylate, and t-butyl (meth)acrylate.

[0131] In this embodiment, the content of the (meth)acrylic acid ester monomer unit (b2) in the entire polymer component (B) is, for example, preferably 1 to 59.9% by mass, more preferably 5 to 53% by mass, and even more preferably 15 to 43% by mass, based on the entire polymer component (B), from the viewpoint of improving antistatic properties and impact resistance while maintaining high transparency of the entire antistatic transparent resin composition. If the content is less than 1% by mass, the transparency of the antistatic transparent resin composition decreases. If the content exceeds 90% by mass, the impact resistance decreases.

[0132] <(Meth)acrylic acid monomer unit (b3)> In this embodiment, examples of the (meth)acrylic acid monomer unit (b3) include methacrylic acid, acrylic acid, maleic anhydride, maleic acid, fumaric acid, and itaconic acid, and methacrylic acid or acrylic acid is preferable.

[0133] In this embodiment, the content of the (meth)acrylic acid monomer unit (b3) in the entire polymer component (B) is, for example, preferably 0.1 to 20 mass%, more preferably 3 to 14 mass%, and even more preferably 6 to 12 mass%, based on the entire polymer component (B), from the viewpoint of improving antistatic properties and impact resistance while maintaining high transparency of the entire antistatic transparent resin composition. If the content is less than 0.1 mass%, the effect of improving the transparency of the antistatic transparent resin composition tends to be low. If the content exceeds 20 mass%, gelled matter in the resin tends to increase, and the fluidity and mechanical properties of the obtained antistatic transparent resin composition tend to be low.

[0134] In addition, when the polymer component (B) contains a copolymer having a styrene-based monomer unit (b1), a (meth)acrylic acid ester monomer unit (b2), and a (meth)acrylic acid monomer unit (b3), the (meth)acrylic acid ester monomer unit (b2) suppresses the dehydration reaction of the (meth)acrylic acid monomer unit (b3) by intermolecular interaction with the (meth)acrylic acid monomer unit (b3), and also has the effect of improving the mechanical strength of the resin. Furthermore, the (meth)acrylic acid ester monomer unit (b2) also contributes to improving the resin properties such as weather resistance and surface hardness. Furthermore, when the (meth)acrylic acid monomer unit (b3) and the (meth)acrylic acid ester monomer unit (b2) are bonded side by side, a dealcoholization reaction may occur under certain conditions when a high-temperature, high-vacuum devolatilizer is used, resulting in the formation of a six-membered cyclic acid anhydride. The polymer component (B) of the present embodiment may contain this six-membered cyclic acid anhydride, but since this reduces fluidity, it is preferable that the amount of six-membered cyclic acid anhydride produced is as small as possible.

[0135] Specific examples of the polymer constituting the polymer component (B) in this embodiment include styrene-acrylic binary copolymers such as styrene-isopropyl acrylate copolymer, styrene-t-butyl acrylate copolymer, styrene-s-butyl acrylate copolymer, styrene-isobutyl acrylate copolymer, and styrene-n-butyl acrylate copolymer; styrene-acrylic ternary copolymers such as styrene-acrylic acid-n-butyl acrylate copolymer, styrene-acrylic acid-s-butyl acrylate copolymer, styrene-acrylic acid-t-butyl acrylate copolymer, and styrene-acrylic acid-isobutyl acrylate copolymer; styrene-isopropyl methacrylate copolymer, styrene-methacrylic binary copolymers such as styrene-t-butyl methacrylate copolymer, styrene-s-butyl methacrylate copolymer, styrene-isobutyl methacrylate copolymer, or styrene-n-butyl methacrylate copolymer are preferred, and styrene-butyl acrylate binary copolymers, styrene-methyl (meth)acrylate-butyl acrylate terpolymers, or styrene-methyl (meth)acrylate-butyl acrylate terpolymers represented by styrene-t-butyl acrylate copolymer, styrene-s-butyl acrylate copolymer, styrene-isobutyl acrylate copolymer, or styrene-n-butyl acrylate copolymer are more preferred.

[0136] In the present embodiment, the polymer constituting the polymer component (B) may be any of a random copolymer, a block copolymer, and an alternating copolymer, but from the viewpoint of dispersibility, a random copolymer is preferred.

[0137] In the present embodiment, the polymer constituting the polymer component (B) may be grafted onto the surface of the rubber-like polymer particles (C1) described below.

[0138] The polymer constituting the polymer component (B) in this embodiment may contain one or more monomer units selected from the group consisting of styrene-based monomer units (b1), (meth)acrylic acid ester monomer units (b2) and (meth)acrylic acid monomer units (b3). Therefore, the polymer constituting the polymer component (B) is not particularly limited as long as it is a homopolymer or a copolymer of two or more components, and preferably contains a binary to quaternary copolymer, more preferably contains a binary to ternary copolymer, and particularly preferably contains a terpolymer.

[0139] That is, the polymer constituting the polymer component (B) in this embodiment preferably contains one or more selected from the group consisting of a styrene-based copolymer (B1) having the styrene-based monomer unit (b1) and the (meth)acrylic acid ester monomer unit (b2) and a styrene-based copolymer (B2) having the styrene-based monomer unit (b1) and the (meth)acrylic acid monomer unit (b3). The styrene-based copolymer (B2) may also contain the (meth)acrylic acid ester monomer unit (b2). A suitable polymer constituting the polymer component (B) in this embodiment is a ternary copolymer containing a styrene-based monomer unit (b1), a (meth)acrylic acid ester monomer unit (b2) and a (meth)acrylic acid monomer unit (b3). This makes it possible to provide an antistatic transparent grease composition with a better balance of fluidity, impact resistance, folding resistance and transparency. In addition, the appearance of a sheet made from the antistatic transparent grease composition can also be improved. The styrene copolymer (B1) does not contain any (meth)acrylic acid monomer units (b3).

[0140] <Preferable form of polymer component (B)> As described above, the polymer component (B) of the present embodiment may be any polymer component (B) in a composition containing the styrene-based monomer units (b1), the (meth)acrylic acid ester monomer units (b2), and the (meth)acrylic acid monomer units (b3). The polymer component (B) may be a mixture of multiple homopolymers, or a system containing one or more copolymers having multiple monomer units, or a mixture of one or more homopolymers and one or more copolymers having multiple monomer units.

[0141] Among them, the preferred polymer component (B) of the present embodiment preferably contains a copolymer having a styrene-based monomer unit (b1), a (meth)acrylic acid ester monomer unit (b2), and a (meth)acrylic acid monomer unit (b3) (e.g., a styrene-based copolymer (B2)) in an amount of 2 to 100% by mass based on the entire polymer component (B). In other words, the antistatic transparent resin composition of the present embodiment preferably contains the antistatic component (A) and a copolymer having a styrene-based monomer unit (b1), a (meth)acrylic acid ester monomer unit (b2), and a (meth)acrylic acid monomer unit (b3) (e.g., a styrene-based copolymer (B2)). This results in a significantly high compatibility between the antistatic component (A) and the polymer component (B), so that the antistatic component (A) and the polymer component (B) are homogeneously compatible with each other, and an antistatic transparent resin composition exhibiting higher transparency and excellent impact resistance and excellent antistatic properties can be obtained. Hereinafter, with reference to Figs. 1 and 2, an antistatic transparent resin composition containing a copolymer having a styrene-based monomer unit (b1), a (meth)acrylic acid ester monomer unit (b2), and a (meth)acrylic acid monomer unit (b3), and an antistatic agent (a1) having an amide bond will be described.

[0142] Fig. 1(a) is a schematic diagram showing the dispersion state of each component in an antistatic transparent grease composition 1 containing a general antistatic agent 2 and a styrene resin 3 (e.g., a homopolymer of polystyrene) containing a styrene-based monomer unit (b1). Fig. 1(b) is a schematic diagram showing the dispersion state of each component in an antistatic transparent grease composition 1 containing a general antistatic agent 2, a styrene resin 3 (e.g., a homopolymer of polystyrene) containing a styrene-based monomer unit (b1), and a copolymer 4 (e.g., a styrene-based copolymer (B2)) having a styrene-based monomer unit (b1), a (meth)acrylic acid ester monomer unit (b2), and a (meth)acrylic acid monomer unit (b3). FIG. 2 is a schematic diagram showing the dispersion state of each component in an antistatic transparent resin composition 1 containing a styrene resin 3 (e.g., a homopolymer of polystyrene) containing a styrene-based monomer unit (b1), a copolymer 4, and an antistatic agent (a1) having an amide bond as an antistatic agent 2. The lower diagram in FIG. 2 is a schematic diagram showing an enlargement of the square frame in the upper diagram in FIG. 2.

[0143] As shown in FIG. 1, in the antistatic transparent oil composition 1, the domain phase of the antistatic agent 2 is dispersed in the polymer matrix phase of the styrene resin 3. When a copolymer 4 having a styrene monomer unit (b1), a (meth)acrylic acid ester monomer unit (b2), and a (meth)acrylic acid monomer unit (b3) is added as a so-called compatibilizer to the state of the antistatic transparent oil composition 1 shown in FIG. 1, due to the mutual compatibility of the copolymer 4, the styrene resin 3, and the antistatic agent 2, the copolymer 4 tends to be unevenly distributed near the interface between the domain phase of the antistatic agent 2 and the polymer matrix phase of the styrene resin 3, as shown in FIG. 1(b). Next, when an antistatic agent (a1) having an amide bond is used as the antistatic agent 2, it was confirmed that the compatibility of the antistatic agent 2 and the copolymer 4 is extremely good as shown in FIG. 2, so that the antistatic agent 2 and the copolymer 4 form a mutually compatible domain 5. It is considered that the transparency and mechanical strength of the entire antistatic transparent oil composition 1 are significantly improved. To explain the refractive index by taking an example, when the refractive index of the styrene resin 3 is, for example, 1.54, the refractive index of the antistatic agent 2 is, for example, 1.50, and the refractive index of the copolymer 4 is, for example, 1.57, it has been confirmed that the refractive index of the domain 5 is approximately 1.535, which is the arithmetic average of the refractive indexes of the antistatic agent 2 and the copolymer 4.

[0144] Therefore, a suitable polymer component (B) in this embodiment preferably contains a copolymer having a styrene-based monomer unit (b1), a (meth)acrylic acid ester monomer unit (b2), and a (meth)acrylic acid monomer unit (b3) in an amount of 2 to 100 mass% based on the entire polymer component (B), and more preferably contains a copolymer (B2) having a styrene-based monomer unit (b1), a (meth)acrylic acid ester monomer unit (b2), and a (meth)acrylic acid monomer unit (b3), and a polymer containing a styrene-based monomer unit (b1), and the content of the copolymer (B2) is 2 to 100 mass% and the content of the polymer is 0 to 98 mass% based on the entire polymer component (B).

[0145] When the polymer component (B) of this embodiment has the above composition, the compatibility with the antistatic agent is improved, and an antistatic transparent resin composition exhibiting higher transparency and excellent impact resistance and excellent antistatic properties can be obtained.

[0146] <Styrene-based copolymer (B1)> The polymer component (B) of the present embodiment preferably contains a styrene-based copolymer (B1). The styrene-based copolymer (B1) is preferably a copolymer having a styrene-based monomer unit (b1) and a (meth)acrylic acid ester monomer unit (b2). The styrene-based copolymer (B1) does not contain a (meth)acrylic acid monomer unit (b3). The styrene-based copolymer (B1) is preferably a binary to quaternary copolymer.

[0147] The content of the styrene monomer unit (b1) is preferably 45 to 80% by mass relative to the entirety (100% by mass) of the styrene copolymer (B1). The lower limit of the content of the styrene monomer unit (b1) is preferably 47% by mass or more, 48% by mass or more, 49% by mass or more, 50% by mass or more, 51% by mass or more, and 52% by mass or more, relative to the entirety (100% by mass) of the styrene copolymer (B1). The upper limit of the content of the styrene monomer unit (b1) is preferably 75% by mass or less, 70% by mass or less, 65% by mass or less, 60% by mass or less, and 55% by mass or less, relative to the entirety (100% by mass) of the styrene copolymer (B1).

[0148] The content of the (meth)acrylic acid ester monomer unit (b2) is preferably 25 to 60% by mass based on the total (100% by mass) of the styrene-based copolymer (B1). The lower limit of the content of the (meth)acrylic acid ester monomer unit (b2) is preferably 41% by mass or more, 42% by mass or more, 43% by mass or more, 44% by mass or more, 45% by mass or more, and 46% by mass or more based on the total (100% by mass) of the styrene-based copolymer (B1). The upper limit of the content of the (meth)acrylic acid ester monomer unit (b2) is preferably 55% by mass or less, 54% by mass or less, 53% by mass or less, 52% by mass or less, 51% by mass or less, and 50% by mass or less based on the total (100% by mass) of the styrene-based copolymer (B1).

[0149] When the antistatic transparent resin composition of the present embodiment contains a styrene copolymer (B1), the upper limit of the content of the styrene copolymer (B1) is preferably 95% by mass or less, 90% by mass or less, 85% by mass or less, 80% by mass or less, 75% by mass or less, and 70% by mass or less, based on the total (100% by mass) of the antistatic transparent resin composition. The lower limit of the content of the styrene copolymer (B1) is preferably 50% by mass or more, 52% by mass or more, 54% by mass or more, 56% by mass or more, 58% by mass or more, and 60% by mass or more, based on the total (100% by mass) of the antistatic transparent resin composition.

[0150] When the polymer component (B) of this embodiment contains a styrene copolymer (B1), the upper limit of the content of the styrene copolymer (B1) is preferably 95% by mass or less, 90% by mass or less, 85% by mass or less, 80% by mass or less, 75% by mass or less, and 70% by mass or less, based on the total (100% by mass) of the polymer component (B). The lower limit of the content of the styrene copolymer (B1) is preferably 45% by mass or more, 47% by mass or more, 49% by mass or more, 51% by mass or more, 53% by mass or more, and 55% by mass or more, based on the total (100% by mass) of the polymer component (B).

[0151] The refractive index of the styrene-based copolymer (B1) is preferably in the range of 1.505 to 1.650, more preferably in the range of 1.520 to 1.575, and further preferably in the range of 1.535 to 1.550. The refractive index of the styrene-based copolymer (B1) was measured at 25° C. using an Abbe refractometer.

[0152] <Styrene-based copolymer (B2)> The polymer component (B) of the present embodiment preferably contains a styrene-based copolymer (B2). The styrene-based copolymer (B2) is preferably a copolymer having a styrene-based monomer unit (b1), a (meth)acrylic acid ester monomer unit (b2), and a (meth)acrylic acid monomer unit (b3). The styrene-based copolymer (B2) is preferably a ternary copolymer.

[0153] The content of the styrene monomer unit (b1) is preferably 70 to 99.5% by mass based on the total (100% by mass) of the styrene copolymer (B2). The lower limit of the content of the styrene monomer unit (b1) is preferably 72% by mass or more, 74% by mass or more, 76% by mass or more, 78% by mass or more, 80% by mass or more, and 82% by mass or more based on the total (100% by mass) of the styrene copolymer (B2). The upper limit of the content of the styrene monomer unit (b1) is preferably 99% by mass or less, 97% by mass or less, 95% by mass or less, 93% by mass or less, 91% by mass or less, and 89% by mass or less based on the total (100% by mass) of the styrene copolymer (B2).

[0154] The content of the (meth)acrylic acid ester monomer unit (b2) is preferably 3 to 50 mass% based on the total (100 mass%) of the styrene-based copolymer (B2). The lower limit of the content of the (meth)acrylic acid ester monomer unit (b2) is preferably 3.5 mass% or more, 4 mass% or more, 4.5 mass% or more, 5 mass% or more, 5.5 mass% or more, and 5.7 mass% or more based on the total (100 mass%) of the styrene-based copolymer (B2). The upper limit of the content of the (meth)acrylic acid ester monomer unit (b2) is preferably 45 mass% or less, 40 mass% or less, 35 mass% or less, 30 mass% or less, 25 mass% or less, and 20 mass% or less based on the total (100 mass%) of the styrene-based copolymer (B2).

[0155] The content of the (meth)acrylic acid monomer unit (b3) is preferably 0.5 to 20% by mass based on the total (100% by mass) of the styrene-based copolymer (B2). The lower limit of the content of the (meth)acrylic acid monomer unit (b3) is preferably 1% by mass or more, 3% by mass or more, 5% by mass or more, 7% by mass or more, 9% by mass or more, and 11% by mass or more based on the total (100% by mass) of the styrene-based copolymer (B2). The upper limit of the content of the (meth)acrylic acid monomer unit (b3) is preferably 18% by mass or less, 16% by mass or less, 14% by mass or less, 13% by mass or less, and 12% by mass or less based on the total (100% by mass) of the styrene-based copolymer (B2).

[0156] When the antistatic transparent resin composition of the present embodiment contains a styrene copolymer (B2), the upper limit of the content of the styrene copolymer (B2) is preferably 25% by mass or less, 23% by mass or less, 21% by mass or less, 19% by mass or less, 17% by mass or less, and 15% by mass or less, based on the total (100% by mass) of the antistatic transparent resin composition. The lower limit of the content of the styrene copolymer (B2) is preferably 2% by mass or more, 3% by mass or more, 3.5% by mass or more, 4% by mass or more, 4.5% by mass or more, and 5% by mass or more, based on the total (100% by mass) of the antistatic transparent resin composition.

[0157] When the polymer component (B) of this embodiment contains a styrene copolymer (B2), the upper limit of the content of the styrene copolymer (B2) is preferably 25% by mass or less, 23% by mass or less, 21% by mass or less, 19% by mass or less, 17% by mass or less, and 15% by mass or less, based on the total (100% by mass) of the polymer component (B). The lower limit of the content of the styrene copolymer (B2) is preferably 2% by mass or more, 3% by mass or more, 3.5% by mass or more, 4% by mass or more, 4.5% by mass or more, and 5% by mass or more, based on the total (100% by mass) of the polymer component (B).

[0158] The refractive index of the styrene-based copolymer (B2) is preferably in the range of 1.530 to 1.650, more preferably in the range of 1.550 to 1.600, and further preferably in the range of 1.565 to 1.575. The refractive index of the styrene-based copolymer (B2) was measured at 25° C. using an Abbe refractometer.

[0159] (Physical properties of polymer component (B)) The melt mass flow rate of the polymer constituting the polymer component (B) in this embodiment is preferably 0.3 to 15 g / 10 min, more preferably 1.0 to 12.0 g / 10 min, and particularly preferably 2.0 to 10.0 g / 10 min. The melt mass flow rate of the styrene copolymer is a value measured at 200° C. under a load of 5 kg in accordance with JIS K 7210-1.

[0160] In this embodiment, the weight average molecular weight (Mw) of the polymer constituting the polymer component (B) is preferably 100,000 or more and 200,000 or less, more preferably 120,000 or more and 180,000 or less. If the weight average molecular weight is less than 100,000, the impact strength of the antistatic transparent resin composition may decrease, and if the weight average molecular weight exceeds 200,000, the dispersibility of the styrene copolymer in the antistatic transparent resin composition decreases, and the mechanical strength, particularly the folding endurance strength, decreases. The weight average molecular weight in the present invention is measured by the method described in the "Examples" section.

[0161] In this embodiment, the number average molecular weight (Mn) of the polymer constituting the polymer component (B) is preferably 50,000 to 150,000, more preferably 55,000 to 100,000, even more preferably 55,000 to 90,000, and even more preferably 60,000 to 80,000. If the number average molecular weight is less than 50,000, the impact strength of the antistatic transparent resin composition may decrease, and if the number average molecular weight exceeds 150,000, the dispersibility of the styrene copolymer in the antistatic transparent resin composition decreases, and the mechanical strength, particularly the folding strength, decreases. The weight average molecular weight in the present invention is measured by the method described in the "Examples" section.

[0162] In this embodiment, it is preferable that the number average molecular weight (Mn) of the polymer constituting polymer component (B) is 55,000 or more and 100,000 or less, and the weight average molecular weight (Mw) of the polymer constituting polymer component (B) is 100,000 or more and 200,000 or less. When the polymer constituting the polymer component (B) contains a large amount of low molecular weight components, the number average molecular weight (Mn) itself tends to be small, and the entanglement of the molecules is reduced, which tends to deteriorate the effect of the folding resistance. On the other hand, the weight average molecular weight (Mw) of the polymer constituting the polymer component (B) is not influenced by the position of the peak top, and tends not to be influenced by the low molecular weight components. Therefore, by controlling both the number average molecular weight (Mn) and the weight average molecular weight (Mw) of the polymer constituting the polymer component (B), the effect of the folding resistance can be maximized.

[0163] <Polymerization method for polymer constituting polymer component (B)> In this embodiment, the polymerization method for the polymer constituting the polymer component (B) is not particularly limited, but for example, a bulk polymerization method or a solution polymerization method can be suitably adopted as a radical polymerization method. The polymerization method mainly includes a polymerization step of polymerizing the polymerization raw materials (monomer components) and a devolatilization step of removing volatile matters such as unreacted monomers and polymerization solvent from the polymerization product.

[0164] An example of a method for polymerizing the polymer constituting the polymer component (B) that can be used in the present embodiment will be described below.

[0165] When the polymerization raw materials are polymerized to obtain the polymer constituting the polymer component (B) of the present embodiment, a polymerization initiator and a chain transfer agent are typically contained in the polymerization raw material composition.

[0166] The polymerization initiator used in the polymerization of the polymer constituting the polymer component (B) of this embodiment may be an organic peroxide, for example, peroxyketals such as 2,2-bis(t-butylperoxy)butane, 1,1-bis(t-butylperoxy)cyclohexane, n-butyl-4,4-bis(t-butylperoxy)valerate, dialkyl peroxides such as di-t-butyl peroxide, t-butylcumyl peroxide, dicumyl peroxide, diacyl peroxides such as acetyl peroxide, isobutyryl peroxide, peroxydicarbonates such as diisopropyl peroxydicarbonate, peroxyesters such as t-butyl peroxyacetate, ketone peroxides such as acetylacetone peroxide, hydroperoxides such as t-butyl hydroperoxide, etc. From the viewpoint of decomposition rate and polymerization rate, 1,1-bis(t-butylperoxy)cyclohexane is preferred.

[0167] Examples of the chain transfer agent used in the polymerization of the polymer constituting the polymer component (B) of this embodiment include α-methylstyrene linear dimer, n-dodecyl mercaptan, t-dodecyl mercaptan, and n-octyl mercaptan.

[0168] As a polymerization method for the polymer constituting the polymer component (B) of this embodiment, solution polymerization using a polymerization solvent can be adopted as necessary. Examples of the polymerization solvent used include aromatic hydrocarbons, such as ethylbenzene, and dialkyl ketones, such as methyl ethyl ketone, and each of them may be used alone or in combination of two or more. Other polymerization solvents, such as aliphatic hydrocarbons, can be further mixed with aromatic hydrocarbons as long as the solubility of the polymerization product is not reduced. These polymerization solvents are preferably used in an amount not exceeding 25 parts by mass relative to 100 parts by mass of the total monomers. If the amount of the polymerization solvent exceeds 25 parts by mass relative to 100 parts by mass of the total monomers, the polymerization rate is significantly reduced and the mechanical strength of the obtained resin tends to be significantly reduced. It is preferable to add the polymerization solvent at a ratio of 5 to 20 parts by mass relative to 100 parts by mass of the total monomers before polymerization, as this makes it easier to uniformize the quality and is also preferable in terms of polymerization temperature control.

[0169] In this embodiment, the apparatus used in the polymerization step for obtaining the polymer constituting the polymer component (B) is not particularly limited, and may be appropriately selected according to a known polymerization method. For example, when bulk polymerization is employed, a polymerization apparatus having one or more completely mixed reactors connected thereto can be used. There is also no particular limitation on the devolatilization step. When bulk polymerization is employed, polymerization is continued until the final amount of unreacted monomer is preferably 50 mass% or less, more preferably 40 mass% or less, and devolatilization treatment is performed by a known method in order to remove volatile matters such as unreacted monomer. More specifically, for example, a normal devolatilization apparatus such as a flash drum, a twin-screw devolatilizer, a thin film evaporator, an extruder, etc. can be used, but a devolatilization apparatus with a small retention portion is preferred. The temperature of the devolatilization treatment is usually about 190 to 280°C, more preferably 190 to 260°C. The pressure of the devolatilization treatment is usually about 0.13 to 4.0 kPa, preferably 0.13 to 3.0 kPa, more preferably 0.13 to 2.0 kPa. As a method for removing volatile matters, for example, a method of removing volatile matters under reduced pressure while heating, or a method of removing volatile matters through an extruder or the like designed for the purpose of removing volatile matters is preferable.

[0170] (Rubber-like polymer particles (C1)) The antistatic transparent grease composition in this embodiment may contain particles of a rubber-like polymer (c1) (referred to as rubber-like polymer particles (C1) in this specification). This can improve the mechanical properties such as impact resistance and folding resistance of the antistatic transparent grease composition as a whole. Furthermore, in this specification, the content of each of the rubber-like polymer (c1), conjugated diene (e.g., polybutadiene) or rubber-like polymer particles (C1) is considered to be part of the content of the polymer component (B). Therefore, in other words, in the antistatic transparent grease composition of this embodiment, the polymer component (B) may contain rubber-like polymer particles (C1).

[0171] The rubber-like polymer particles (C1) in this embodiment may be any particle containing a rubber-like polymer (c1). Therefore, the form of the rubber-like polymer particles (C1) includes solid particles made of the rubber-like polymer (c1), hollow particles made of the rubber-like polymer (c1), encapsulated particles in which a phase containing a polymer constituting the polymer component (B) is encapsulated in the rubber-like polymer (c1) (including microphase separation structure, core-shell structure, and salami-type structure), and surface-grafted particles in which a polymer constituting the polymer component (B) is grafted to the surface. These forms may also be combined. Preferred forms of the rubber-like polymer particles (C1) in this embodiment include surface-grafted particles in which a polymer constituting the polymer component (B) is grafted to the surface of solid particles made of the rubber-like polymer (c1), and surface-grafted encapsulated particles in which a polymer constituting the polymer component (B) is grafted to the surface of encapsulated particles in which a phase containing a polymer constituting the polymer component (B) is encapsulated in the rubber-like polymer (c1) (including microphase separation structure, core-shell structure, and salami-type structure). Of these, the rubber-like polymer particles (C1) are preferably the above-mentioned surface-grafted particles, encapsulated particles (including a microphase-separated structure, a core-shell structure, and a salami-type structure), and surface-grafted encapsulated particles.

[0172] The encapsulated particles include the following structures (1) to (3).

[0173] (1) The polymer constituting the polymer component (B) (e.g., polystyrene and / or a styrene-based copolymer having a styrene-based monomer unit (b1), a (meth)acrylic acid ester monomer unit (b2) and a (meth)acrylic acid monomer unit (b3)) is a block copolymer (including a partially or fully hydrogenated copolymer), and a microphase-separated structure is formed from this block copolymer.

[0174] (2) A core-shell structure having a phase containing a polymer constituting the polymer component (B) (e.g., polystyrene and / or a styrene-based copolymer having a styrene-based monomer unit (b1), a (meth)acrylic acid ester monomer unit (b2) and a (meth)acrylic acid monomer unit (b3)) as a core and a rubber-like polymer (c1) as a shell.

[0175] (3) A salami-shaped structure in which a plurality of phases containing a polymer constituting the polymer component (B) (e.g., polystyrene and / or a styrene-based copolymer having a styrene-based monomer unit (b1), a (meth)acrylic acid ester monomer unit (b2) and a (meth)acrylic acid monomer unit (b3)) are encapsulated within the rubber-like polymer (c1). The term "polystyrene" in the above (1) to (3) refers to a homopolymer of a styrene-based monomer unit (b1).

[0176] The rubber-like polymer particles (C1) in this embodiment particularly preferably have a salami-shaped structure in which a plurality of phases containing the polymer constituting the polymer component (B) (e.g., polystyrene and / or a styrene-based copolymer having styrene-based monomer units (b1), (meth)acrylic acid ester monomer units (b2) and (meth)acrylic acid monomer units (b3)) are encapsulated within the rubber-like polymer (c1).

[0177] Incidentally, the particles containing the rubbery polymer (c1) refer to those in which the rubbery polymer (c1) accounts for 5% by mass or more of the total rubbery polymer particles (C1).

[0178] In this embodiment, it is preferable that 60% or more of the total number of rubber-like polymer particles (C1) present in the antistatic transparent grease composition contain a polymer phase containing a polymer constituting the polymer component (B), and more preferably 80% or more contain a polymer phase containing a polymer constituting the polymer component (B). Also, 60% or more of the total number of rubber-like polymer particles (C1) present in the antistatic transparent grease composition have a salami structure in which a phase containing a polymer constituting the polymer component (B) (e.g., polystyrene and / or styrene-based monomer unit (b1), (meth)acrylic acid ester monomer unit (b2) and (meth)acrylic acid monomer unit (b3)) is contained in the rubber-like polymer particle (C1). Also, in this embodiment, the lower limit of the proportion (number) of the salami structure in the total rubber-like polymer particles (C1) in the antistatic transparent grease composition is more preferably 70% or more, 80% or more, 85% or more, 90% or more and 95% or more in that order. On the other hand, the upper limit of the proportion of the salami structure is more preferably 100% or less, 99% or less, and 98% or less, in that order.

[0179] This makes it possible to provide an antistatic transparent grease composition having superior impact resistance, folding resistance and transparency.

[0180] The number of particles containing a polymer phase containing a polymer constituting the polymer component (B) (e.g., polystyrene and / or a styrene-based copolymer having a styrene-based monomer unit (b1), a (meth)acrylic acid ester monomer unit (b2) and a (meth)acrylic acid monomer unit (b3)) in the total rubber-like polymer particles (C1) in the antistatic transparent resin composition and the proportion of the salami-type structure are calculated by measuring the number average using a transmission electron microscope, in the same manner as in the calculation of the weight-average diameter of the rubber-like polymer particles (C1) described later. Specifically, five ultrathin slices, each 100 nm thick, were prepared from the antistatic transparent oil composition stained with osmium tetroxide, and ten bright-field images at a magnification of 10,000 times were randomly obtained using a transmission electron microscope. Among the ten images obtained, particles stained black were determined to be rubber-like polymer particles (C1), and particles containing two or more phases within the rubber-like polymer particles (C1) were determined to be salami-shaped structure rubber-like polymer particles (C1). The percentage was calculated by dividing the number of salami-shaped structure rubber-like polymer particles (C1) by the total number of rubber-like polymer particles (C1) appearing in the ten images.

[0181] In the antistatic transparent grease composition of this embodiment, the upper limit of the content of all rubber-like polymer particles (C1) (including the polymer phase containing the polymer constituting the polymer component (B)) relative to the total amount of the antistatic transparent grease composition (100 mass%) is preferably 40 mass% or less, 38 mass% or less, 36 mass% or less, 34 mass% or less, 33 mass% or less, 32 mass% or less, 31 mass% or less, 30 mass% or less, 29 mass% or less, 28 mass% or less, 27 mass% or less, 26 mass% or less, 25 mass% or less, 24.5 mass% or less, 24 mass% or less, 23.5 mass% or less, 23 mass% or less, 22.5 mass% or less, or 22 mass% or less. On the other hand, in the antistatic transparent oil composition of the present embodiment, the lower limit of the content of the total rubber-like polymer particles (C1) is preferably 3% by mass or more, 4% by mass or more, 5% by mass or more, 6% by mass or more, 7% by mass or more, 7.3% by mass or more, 8% by mass or more, 8.6% by mass or more, 9% by mass or more, 9.4% by mass or more, 9.9% by mass or more, 10% by mass or more, 10.3% by mass or more, 11% by mass or more, 12% by mass or more, 13% by mass or more, 14% by mass or more, 14.1% by mass or more, 15% by mass or more, 16% by mass or more, or 17% by mass or more, based on 100% by mass of the total amount of the antistatic transparent oil composition. These upper and lower limits can be arbitrarily combined.

[0182] In the antistatic transparent oil composition of the present embodiment, the content of the rubber-like polymer particles (C1) is 3% by mass or more and 40% by mass or less, preferably 5% by mass or more and 35% by mass or less, more preferably 8% by mass or more and 32% by mass or less, and even more preferably 10% by mass or more and 30% by mass or less, based on 100% by mass of the total amount of the antistatic transparent oil composition. By setting the content to 3% by mass or more and 40% by mass or less, it becomes easier to achieve both excellent impact resistance and rigidity.

[0183] In the antistatic transparent grease composition of this embodiment, the content of the rubbery polymer (c1) constituting the rubbery polymer particles (C1) (not including the polymer phase containing the polymer constituting the polymer component (B)) relative to the total amount (100 mass%) of the antistatic transparent grease composition is 3 mass% or more, preferably 7 mass% or more and 20 mass% or less, and more preferably 8 mass% or more and 16 mass% or less. If the content of the rubbery polymer (c1) is less than 10%, the impact absorbing effect is small, resulting in reduced impact resistance. In addition, the folding resistance is extremely reduced. If the content of the rubbery polymer (c1) is more than 20%, problems of reduced fluidity and reduced heat resistance occur, and impact resistance is also reduced.

[0184] In this specification, the amount of the rubber-like polymer (c1) constituting the rubber-like polymer particle (C1) is calculated using the measurement method described in "(5) Measurement of the amount of rubber-like polymer (c1)" in the Examples section below.

[0185] Amount of rubber-like polymer (c1) (%) = 10.8 × x × (BA) / W That is, the amount of the rubber-like polymer (c1) represents, for example, substantially the amount of conjugated diene such as butadiene.

[0186] In this embodiment, the rubber-like polymer particles (C1) preferably contain a polymer phase containing a polymer constituting the polymer component (B) (e.g., polystyrene and / or a styrene-based copolymer (B1) having a styrene-based monomer unit (b1) and a (meth)acrylic acid ester monomer unit (b2)). This can further improve the impact resistance and folding resistance. In addition, it is preferable that 80 mass % or more of the rubber-like polymer particles (C1) in the antistatic transparent oil composition in this embodiment is occupied by a polymer phase containing the polymer constituting the polymer component (B) encapsulated in the rubber-like polymer particles (C1), and more preferably 80 mass % or more and 95 mass % or less of the rubber-like polymer particles (C1) is occupied by the polymer phase.

[0187] The content of the polymer phase containing the polymer constituting the polymer component (B) encapsulated in the rubber-like polymer particles (C1) is determined by subtracting the content of the rubber-like polymer (c1) from the content of the rubber-like polymer particles (C1).

[0188] The material used for the rubber-like polymer particles (C1) (or rubber-like polymer (c1)) of this embodiment may have a conjugated diene structure. Therefore, the rubber-like polymer (c1) in this embodiment preferably has a conjugated diene, and is preferably a conjugated diene-based polymer. The rubber-like polymer (c1) may be, for example, polybutadiene, polyisoprene, natural rubber, polychloroprene, styrene-butadiene copolymer, acrylonitrile-butadiene copolymer, or the like. Among them, polybutadiene or styrene-butadiene copolymer is preferable. As the polybutadiene, both high-cis polybutadiene having a high cis content and low-cis polybutadiene having a low cis content can be used. In addition, the polybutadiene may have a styrene-butadiene copolymer and / or an acrylonitrile-butadiene copolymer in a part or all of the polybutadiene. As the structure of the styrene-butadiene copolymer and the acrylonitrile-butadiene copolymer, both a random structure and a block structure can be used. These rubber-like polymer particles (C1) can be used either individually or in combination.

[0189] In this embodiment, when a conjugated diene polymer containing a vinyl cyanide monomer unit (e.g., (meth)acrylonitrile such as an acrylonitrile monomer unit) is used as a material for the rubber-like polymer particle (C1) (or rubber-like polymer), the content of the vinyl cyanide monomer unit (e.g., (meth)acrylonitrile monomer unit) is preferably 5 mass% or less, more preferably 3 mass% or less, even more preferably 1 mass% or less, and particularly preferably 0.7 mass% or less, relative to the entire antistatic transparent resin composition (100 mass%).

[0190] Furthermore, saturated rubber obtained by hydrogenating the above-mentioned butadiene rubber, natural rubber, styrene-butadiene copolymer, acrylonitrile-butadiene copolymer may be used as the rubber-like polymer particles (C1).

[0191] In this embodiment, the rubber-like polymer particles (C1) preferably have at least one type of surface-grafted encapsulated particles in which a phase containing a polymer constituting the polymer component (B) (e.g., polystyrene and / or a styrene-based copolymer having a styrene-based monomer unit (b1) and a (meth)acrylic acid ester monomer unit (b2)) is encapsulated in polybutadiene or polybutadiene-styrene copolymer having a polymer constituting the polymer component (B) (e.g., polystyrene and / or a styrene-based copolymer having a styrene-based monomer unit (b1) and a (meth)acrylic acid ester monomer unit (b2)) grafted to the surface, and the rubber-like polymer particles (C1) are preferably surface-grafted encapsulated particles having a weight average diameter in the range of 0.30 μm to 1.6 μm, more preferably 0.4 μm to 1.2 μm, and even more preferably 0.5 μm to 1.0 μm.

[0192] In this embodiment, the surface-grafted encapsulated particles are preferably contained in an amount of 3 to 40 mass %, and more preferably 11 to 30 mass %, relative to the entire antistatic transparent oil composition (100 mass %). If it is less than 3 mass %, the fluidity is good but it is difficult to exhibit impact resistance and folding resistance, and if it exceeds 40 mass %, the fluidity and appearance such as transparency are deteriorated.

[0193] "Other optional ingredients" In this embodiment, at any stage before or after the recovery step in producing each of the above components (A) to (B), or at the stage of extruding or molding the antistatic transparent resin composition, various additives, for example, a compound containing lithium ions (lithium-based compound), a plasticizer such as liquid paraffin, an ultraviolet absorber, a light stabilizer, an antioxidant such as a hindered phenol-based, phosphorus-based, or sulfur-based antioxidant, a lubricant, an antistatic agent, a flame retardant, various dyes or pigments, an inorganic crystal nucleating agent (metal oxides such as titanium oxide and tin oxide), an organic crystal nucleating agent, a fluorescent brightening agent, a light diffusing agent, or a selective wavelength absorbing agent may be added as necessary within a range that does not impair the object of the present invention.

[0194] (Additives) The antistatic transparent grease composition according to the present invention may further contain a metal oxide as an inorganic crystal nucleating agent. In the antistatic transparent grease composition of the present embodiment, the content of the metal oxide (e.g., titanium dioxide) is preferably 0.07% by mass or more and 5.5% by mass or less, more preferably 0.65% by mass or more and 3.8% by mass or less, and even more preferably 1.2% by mass or more and 3% by mass or less, relative to 100% by mass of the total amount of the antistatic transparent grease composition. In another embodiment, the content is preferably 1.1% by mass or more and 2.8% by mass or less. In yet another embodiment, the content is even more preferably 0.2% by mass or more and 0.9% by mass or less.

[0195] The amount of each of the above-mentioned various additives in the antistatic transparent oil composition is preferably 6.0% by mass or less, more preferably 3.5% by mass or less, even more preferably 0.9% by mass or less, and even more preferably 0.5% by mass or less, relative to 100% by mass of the antistatic transparent oil composition.

[0196] [Physical properties of antistatic transparent grease composition] <DuPont impact strength> The DuPont impact strength of the antistatic transparent grease composition of the present embodiment is preferably 2 kg cm or more, and more preferably 3 kg cm or more. If it is less than 2 kg cm, there is a concern that it may break during use. In the present disclosure, the DuPont impact strength is a value measured in accordance with ISO 179.

[0197] The antistatic transparent resin composition of the present embodiment preferably has a melt mass flow rate of 0.6 g / 10 min or more. If the melt mass flow rate is 0.6 g / 10 min or more, the moldability during extrusion molding or vacuum molding is good. The melt mass flow rate of 0.6 g / 10 min can be achieved by adjusting the melt mass flow rates of the components (A) to (C) and the mixing ratio of these resins. In the present disclosure, the melt mass flow rate is a value measured at a temperature of 200° C. and 5.00 kg in accordance with ISO 1133.

[0198] The antistatic transparent resin composition according to the present invention is preferably used for injection blow molding, sheet (including film), injection molding, or extrusion molding.

[0199] <Total light transmittance> In this embodiment, the total light transmittance, as defined in JIS K 7361-1, of a test piece having a thickness of 1 mm obtained from the antistatic transparent oil composition of this embodiment is preferably 80% or more, more preferably 85% or more, and even more preferably 91% or more.

[0200] <haze> In this embodiment, the haze value of a 1 mm thick test piece obtained from the antistatic transparent oil composition of this embodiment, as measured in accordance with JIS K 7105, is preferably 10% or less, more preferably 8% or less, and even more preferably 6% or less.

[0201] <Method of producing antistatic transparent oil composition> In the present embodiment, the method for producing the antistatic transparent resin composition is not particularly limited to the method for blending, melting, kneading, and granulating the styrene-based resin (A) and liquid paraffin, and any method commonly used in the production of resin compositions can be used. For example, the above components blended (mixed) in a drum tumbler, Henschel mixer, etc. are melted and kneaded using a Banbury mixer, single-screw extruder, twin-screw extruder, kneader, etc., and granulated using a rotary cutter, fan cutter, etc., to obtain a resin composition. The resin temperature during melting and kneading is preferably 180 to 240°C. In order to achieve a target resin temperature, it is preferable to set the cylinder temperature of the extruder, etc. to a temperature 10 to 20°C lower than the resin temperature. If the resin temperature is less than 180°C, mixing will be insufficient, which is not preferable. On the other hand, if the resin temperature exceeds 240°C, thermal decomposition of the resin will occur, which is not preferable.

[0202] <Preferred form of antistatic transparent grease composition> A preferred antistatic transparent oil composition of this embodiment contains a polyetheramide block copolymer (A1-1) or a polyetheresteramide block copolymer (A1-2) as an antistatic component (A), and a terpolymer having a styrene-based monomer unit (b1), a (meth)acrylic acid ester monomer unit (b2), and a (meth)acrylic acid monomer unit (b3) as a polymer component (B), It is particularly preferred that the total amount of the polyetheramide block copolymer (A1-1) and the polyetheresteramide block copolymer (A1-2) is 15 to 30% by mass, and the total amount of the terpolymer is 5 to 30% by mass, based on the total amount of the antistatic transparent composition. It is also particularly preferred that the suitable antistatic transparent composition contains rubber-like polymer particles (C1) in an amount of 3 to 40% by mass, based on the total amount of the antistatic transparent composition.

[0203] When the antistatic transparent grease composition has the above-mentioned composition, the polyetheramide block copolymer (A1-1) and / or the polyetheresteramide block copolymer (A1-2) and the terpolymer are highly compatible with each other, as shown in FIG. 2 above, and therefore the antistatic transparent grease composition exhibits high transparency and excellent mechanical strength.

[0204] <Molded body> The molded article of this embodiment can be obtained by molding the antistatic transparent resin composition. The molded article is not particularly limited as long as it is obtained by molding the resin composition. The molded article of this embodiment is not particularly limited, but is preferably an injection molded article, an extrusion molded article (for example, a magazine tube (magazine stick)), or a sheet body (including a film). An example of a secondary molded article using the sheet obtained by the extrusion molding of this embodiment is a packaging container for electronic parts, such as a carrier tape, and the container may be manufactured by directly molding (shaping) at the outlet of an extruder, or may be manufactured by further molding the sheet obtained by using an extruder. The sheet of this embodiment can be used to manufacture (mold) molded articles including not only electronic part packaging containers but also other containers.

[0205] In this embodiment, a sheet-shaped molded product is preferable. The sheet of this embodiment may be a non-foamed or foamed sheet. The sheet of this embodiment may be used in a multilayer with a styrene-based resin such as polystyrene resin, or may be used in a multilayer with a resin other than the styrene-based resin in addition to or instead of the layer of the styrene-based resin. Examples of resins other than the styrene-based resin include PC resin, ABS resin, PP resin, PP / PS-based resin, PET resin, and nylon resin.

[0206] The container of the present embodiment is preferably a container obtained by injection blow molding using the above-mentioned antistatic transparent oil composition, or a container obtained by molding the above-mentioned sheet. The container obtained by molding the above-mentioned sheet of the present embodiment is not particularly limited, and examples thereof include a lid material for a lunch box or a container for storing side dishes, etc., formed from a sheet or a multilayer body containing the sheet.

[0207] <Laminate> Another aspect of the present embodiment may be a laminate sheet having a base layer and an antistatic layer containing the antistatic resin composition laminated on one or both surfaces of the base layer.

[0208] The laminate sheet has an antistatic layer containing the antistatic transparent resin composition, and therefore has an excellent balance of high transparency, antistatic properties, and impact resistance.

[0209] The substrate layer is not particularly limited, but in order to effectively realize the gist of the present invention, a substrate exhibiting transparency is preferred, and examples thereof include films obtained by uniaxially or biaxially stretching a film made of a thermoplastic resin such as a transparent styrene-based resin, polyester such as polyethylene terephthalate (PET) or polyethylene naphthalate, polyolefin such as polypropylene, polyamide such as nylon, or polycarbonate. Among these, in consideration of adhesion to a layer containing the antistatic transparent resin composition of the present invention, a substrate layer made of a resin composition containing a styrene-based resin including the styrene monomer (b1) of this embodiment is more preferred.

[0210] <Carrier tape or electronic component packaging tray> One embodiment of a molded article using the antistatic transparent resin composition of the present embodiment may be a container for packaging electronic components. The container for packaging electronic components may be directly molded from the above-described antistatic transparent resin composition of the present embodiment, or may be manufactured from a sheet body molded from the antistatic transparent resin composition of the present embodiment.

[0211] An example of the electronic component packaging container of this embodiment is a carrier tape or a tray for packaging electronic components. One aspect of the electronic component packaging container of this embodiment can be a tray for packaging electronic components composed of a substrate having a plurality of recesses for accommodating electronic components and an edge portion that can be bonded to a covering that seals the recesses. The substrate contains the antistatic transparent resin composition of this embodiment. The carrier tape of this embodiment has the substrate and a covering (cover tape) that seals the recesses provided on the substrate. The cover tape may be of the same material as the substrate, or may be a film made of a thermoplastic resin such as a transparent styrene-based resin, polyester such as polyethylene terephthalate (PET) or polyethylene naphthalate, polyolefin such as polypropylene, polyamide such as nylon, or polycarbonate.

[0212] The carrier tape or the tray for packaging electronic parts of the present invention uses the antistatic transparent resin composition, and thus has an excellent balance of high transparency, antistatic properties, and impact resistance.

[0213] <Method of manufacturing molded body> In this embodiment, the manufacturing method for obtaining a molded body from the resin composition is not particularly limited, and can be manufactured by a known molding method, for example, extrusion molding or injection molding.Specific examples of extrusion molding include extrusion molding, calendar molding, blow molding, extrusion foam molding, profile extrusion molding, lamination molding, inflation molding, T-die film molding, sheet molding, vacuum molding, pressure molding, direct blow molding, etc.In addition, examples of injection molding include injection molding, RIM molding, injection foam molding, injection blow molding, injection stretch blow molding, etc.

[0214] In this embodiment, the method for producing a sheet among the molded products is not particularly limited, but examples thereof include a method in which the sheet is extruded using a single-screw or twin-screw extruder equipped with a T-die, and then taken up as a sheet using a single-screw or biaxial stretching machine.

[0215] In the present embodiment, the method for producing the container by molding the sheet is not particularly limited, and examples thereof include pressure molding and vacuum molding.

[0216] Although the embodiment of the present invention has been described above, the present invention is not limited to the above example and can be modified as appropriate. EXAMPLES

[0217] Hereinafter, the embodiments of the present disclosure will be described in more detail based on examples and comparative examples, but the present disclosure is not limited to these examples in any way.

[0218] "Measurement and evaluation methods" The physical properties of the resin compositions obtained in each of the Examples and Comparative Examples were measured and evaluated according to the following methods.

[0219] <Characteristic analysis of resin or resin composition

[0220] (1) Calculation of the content (mass%) of each of the styrene monomer unit (b1), the (meth)acrylic acid ester monomer unit (b2), and the (meth)acrylic acid monomer unit (b3) in the polymer component (B)

[0221] (NMR measurement) Proton nuclear magnetic resonance ( 1 The resin composition was quantified from the integral ratio of the spectrum measured by a 1 H-NMR measuring device.

[0222] Sample preparation: 30 mg of resin pellets were dissolved in 0.75 ml of d6-DMSO by heating at 60°C for 6 hours.

[0223] Measuring equipment: JEOL JNM ECA-500 Measurement conditions: Measurement temperature 25℃, observation nucleus 1H, number of integrations 64, repeat time 11

[0224] (NMR Spectral Assignments) The assignments of the spectrum measured in DMSO deuterated solvent are as follows: the peaks at 0.5 to 1.5 ppm are hydrogen atoms of α-methyl groups of methacrylic acid, methyl methacrylate, and six-membered cyclic acid anhydrides, the peaks at 1.6 to 2.1 ppm are hydrogen atoms of methylene groups of the polymer main chain, the peak at 3.5 ppm is hydrogen atoms of carboxylate ester (-COOCH3) of methyl methacrylate, and the peak at 12.4 ppm is hydrogen atoms of carboxylate of methacrylic acid. The peaks at 6.5 to 7.5 ppm are hydrogen atoms of aromatic rings of styrene. Note that the content of six-membered cyclic acid anhydrides in the resin of this embodiment is low, so that quantification is usually difficult by this measurement method.

[0225] (2) Molecular weight measurement The molecular weight of the polymer component (B) was measured by gel permeation chromatography (GPC) under the following conditions.

[0226] Equipment: Tosoh HLC-8220 Separation column: Tosoh TSK gel Super HZM-H (inner diameter 4.6 mm) Two are connected in series. Guard column: Tosoh TSK guard column Super HZ-H Measurement solvent: tetrahydrofuran (THF) Sample preparation: Dissolve 5 mg of the sample in 10 mL of solvent and filter through a 0.45 μm filter. Filtration was performed.

[0227] Injection volume: 10μL Measurement temperature: 40℃ Flow rate: 0.35mL / min Detector: Differential refractive index detector (RI-8020) To create the calibration curve, 11 types of TSK standard polystyrene (F-850, F-45 0, F-128, F-80, F-40, F-20, F-10, F-4, F-2, F-1, A-5000) was used. A calibration curve was created using a linear approximation equation. The number average molecular weight (Mn) and weight average molecular weight (Mw) were obtained by calculating the relative molecular weight in polystyrene equivalent from the elution time and elution curve obtained by GPC measurement of the polymer component (B) and the calibration curve created above.

[0228] (3) Measurement of the content of rubber-like polymer particles (C1) The content (mass%) of the rubber-like polymer particles (C1) in the antistatic transparent grease composition was measured by precisely weighing 1 g of the rubber-modified antistatic transparent grease composition in a precipitation tube (this mass is W), adding 20 mL of a 9:1 mixed solution of methyl ethyl ketone / methanol, shaking at 23 ° C. for 2 hours, and then centrifuging at 5 ° C. or less and 20,000 rpm (centrifugal acceleration: 4510 G) for 60 minutes in a centrifuge (manufactured by Sakuma Seisakusho, SS-2050A). The precipitation tube was slowly tilted at about 45 degrees, the supernatant liquid was decanted off, and the obtained insoluble matter was subsequently vacuum-dried at 160 ° C. and 3 kPa or less for 1 hour, cooled to room temperature in a desiccator, and the mass of the methyl ethyl ketone / methanol insoluble matter was precisely weighed (this mass is G), and the content (mass%) of the rubber-like polymer particles (C1) was calculated by the following formula.

[0229] Content of rubber-like polymer particles (C1) = (G / W) x 10

[0230] (4) Measurement of swelling index of toluene insoluble matter The swelling index was measured by precisely weighing 1 g of the antistatic transparent oil composition in a precipitation tube, adding 20 mL of toluene, and shaking at 23°C for 2 hours, followed by centrifuging for 60 minutes at 10°C or less and 20,000 rpm (centrifugal acceleration: 4510G) in a centrifuge (Sakuma Seisakusho, SS-2050A). The precipitation tube was slowly tilted at about 45 degrees, and the supernatant liquid was decanted and removed. The mass of the insoluble matter containing toluene was precisely weighed (this mass was designated as W1), and then vacuum dried for 1 hour under conditions of 160°C and 3 kPa or less, and cooled to room temperature in a desiccator, after which the mass of the toluene insoluble matter was precisely weighed (this mass was designated as W2), and the swelling index of the toluene insoluble matter was calculated according to the following formula. Swelling index of the toluene insoluble matter = (W1 / W2

[0231] (5) Measurement of the amount of rubber-like polymer (c1) The amount (mass %) of the rubber-like polymer (c1) in the antistatic transparent grease composition was measured as follows.

[0232] 0.4g of the antistatic transparent oil composition was weighed out in a measuring flask (this mass was designated as W), 75mL of chloroform was added and thoroughly dispersed, then 20mL of a solution in which 18g of iodine monochloride was dissolved in 1000mL of carbon tetrachloride was added, the mixture was stored in a cool, dark place, and chloroform was added after 8 hours to adjust the mixture to the marked line. 25mL of the mixture was taken, and 60mL of a solution in which 10g of potassium iodide was dissolved in a mixture of 800mL of water and 200mL of ethanol was added, followed by titration with a solution in which 10g of sodium thiosulfate was dissolved in 1000mL of water (the molar concentration of this solution was designated as x). The content (mass%) of the rubber-like polymer (c1) was calculated by the following formula, with AmL for the main test and BmL for the blank test.

[0233] Content of rubber-like polymer (c1) = 10.8 × x × (BA) /

[0234] (6) Measurement of refractive index A flat plate was prepared for each of the antistatic component (A) and the polymer component (B), and the refractive index was measured at 25° C. using an Abbe refractometer to calculate the refractive index and the difference therebetween.

[0235] (7) Measurement of total light transmittance and haze For a 1 mm thick plate produced by the method described in the "Plate Production Method" section below, the total light transmittance (%) was measured in accordance with JIS K 7361-1. Also, the haze (%) was measured in accordance with JIS K 7136 to evaluate the transparency.

[0236] (8) Measurement of surface resistivity A 2 mm thick plate prepared by the method described in the "Plate Manufacturing Method" section below was pretreated for 2 days at 23°C and 50% RH, and then the surface resistivity and volume resistivity were measured in accordance with JIS K6911.

[0237] (9) Measurement of surface impact strength The test pieces used to measure the surface impact strength were plates made by the method described in the "Plate Manufacturing Method" section below. The test was performed using a DuPont dart tester (manufactured by Toyo Seiki Seisakusho Co., Ltd.) with a missile dropped on the center of a 2 mm thick test piece under the following conditions: impact base diameter 9.4 mm, impact tip diameter 6.2 mm, and load 100 g to 1 kg. The fracture energy was calculated based on the load at which the test piece showed 50% fracture, and this was taken as the surface impact strength.

[0238] (10) Charpy impact strength measurement The test specimens used to measure the Charpy impact strength were plates prepared by the method described in the "ISO dumbbell test specimen manufacturing method" section below. The test was performed in accordance with ISO 179 to measure the Charpy impact strength (kJ / m 2 ) was measured with a notch.

[0239] (11) Measurement of rubber-like polymer particles (C1) The antistatic transparent resin composition of the examples and the resin composition of the comparative examples described later were stained with osmium tetroxide, and five ultrathin slices with a thickness of 100 nm were prepared, and five bright-field images (magnification 10,000 times) were obtained for each using a transmission electron microscope. The five bright-field images were then summed up to obtain the following formula (N1): Weight average diameter = ΣniDri 4 / ΣniDri 3 (N1

[0240] (In the above formula (N1), ni is the number of rubber-like polymer particles (C1) having a particle diameter Dri, and the particle diameter Dri is the particle diameter calculated as a circle-equivalent diameter from the area of ​​the particles in a bright-field image.) The area-average particle diameter was calculated and used as the weight-average diameter of the rubber-like polymer particles (C1). The above analysis was carried out as follows using image analysis software ImageJ (manufactured by the National Institutes of Health, USA). The acquired image was binarized by Otsu's method, and the white parts (corresponding to the matrix phase) other than the rubber-like polymer particles (C1) were filled in. Adjacent rubber-like polymer particles (C1) were divided by Watershed processing, and the area of ​​the rubber-like polymer particles (C1) was calculated and converted into a circle-equivalent diameter. A number-based histogram and average value were derived from the obtained group of circle-equivalent diameter values. The following equipment was used.

[0241] Ultramicrotome: UC7 / Leica Transmission electron microscope: HT7700 / Hitachi High-Technologies Raw materials used in the examples and comparative examples

[0242] (1) Antistatic ingredient (A) Antistatic agent A-1: ​​"Pelestat NC6321, manufactured by Sanyo Chemical Industries, Ltd., refractive index 1.513 polyether ester amide block copolymer" Antistatic agent A-2: "Pelestat NC7530, manufactured by Sanyo Chemical Industries, Ltd., refractive index 1.53 polyether ester amide" Antistatic agent A-3: "Pelectron AS, manufactured by Sanyo Chemical Industries, Ltd., refractive index 1.503 polyether ester amide" Antistatic agent A-4: "Pelectron HC6800, manufactured by Sanyo Chemical Industries, Ltd., refractive index 1.513 polyether ester amide" Antistatic agent A-5: "Pelestat 230, Sanyo Chemical Industries, Ltd., refractive index 1.496, polyether / polyolefin block" Antistatic agent A-6: "Pelectron HS, Sanyo Chemical Industries, Ltd., refractive index 1.496 polyether / polyolefin block" Antistatic agent A-7: "Pelectron PVL, manufactured by Sanyo Chemical Industries, Ltd., refractive index 1.493 polyether / polyolefin block" Antistatic agent A-8: "Irgastat P18, manufactured by BASF Japan Ltd., refractive index 1.501 polyether block amide" Antistatic agent A-9: Pebax MV2080, manufactured by Arkema Co., Ltd., refractive index 1.502, polyether block amide

[0243] (2) Polymer component (B) As the polymer component (B), the following styrene-based resins (B1-1) to (B1-5) and (B2-1) to (B2-5) were used.

[0244] The styrene-based resins (B1-1) to (B1-5) used as the polymer component (B) were synthesized by the following method.

[0245] "Preparation of styrene-based resin (B1-1)" A polymerization liquid obtained by mixing and dissolving 42.0 mass% of styrene as a styrene-based monomer (b1), 3.7 mass% of n-butyl acrylate and 35.5 mass% of methyl methacrylate as (meth)acrylic acid ester-based monomer units (b2), 8.7 mass% of a styrene-butadiene block copolymer (Asahi Kasei Corporation: Asaprene 625A) as a raw material for a rubber-like polymer (c1), 10.0 mass% of ethylbenzene as a solvent, 0.01 mass% of 1,1-bis(t-butylperoxy)cyclohexane as a polymerization initiator, and 0.17 mass% of α-methylstyrene dimer as a chain transfer agent in a raw material container equipped with a stirrer was continuously charged at 2.5 L / Hr into a 6.2 L laminar flow reactor-1 equipped with a stirrer and capable of temperature control in three zones, and the temperature was adjusted to 125°C / 130°C / 135°C.

[0246] The reaction liquid was then sent to a 6.2-liter laminar flow reactor-2 equipped with an agitator and capable of temperature control in three zones, which was connected in series to the laminar flow reactor-1. The agitator rotation speed was set to 15 revolutions per minute, and the temperature was set to 132°C / 137°C / 142°C. The reaction liquid was then sent to a 6.2-liter laminar flow reactor-3 equipped with an agitator and capable of temperature control in three zones. The temperature was set to 140°C / 142°C / 145°C.

[0247] The polymer solution continuously discharged from the polymerization reactor (laminar flow reactor-3) was pelletized after devolatilization under a reduced pressure of 10 torr using an extruder equipped with a vacuum vent to obtain a pellet-shaped styrene-(meth)acrylic resin (styrene-based resin (B1-1)) which is a styrene-based resin (B) (see Table 1). The average particle size of the rubber-like polymer particles was 0.60 μm. The content of styrene monomer units in the styrene-butadiene block copolymer was 35% by mass.

[0248] "Preparation of styrene-based resin (B1-2)" The styrene resin (B1-2) was synthesized by the following method.

[0249] In a raw material container equipped with an agitator, 42.7% by mass of styrene, 3.8% by mass of n-butyl acrylate, 36.1% by mass of methyl methacrylate as styrene monomers, 9.4% by mass of styrene-butadiene block copolymer (Asahi Kasei Corporation: Asaprene 625A) as rubber-like polymer, 8% by mass of ethylbenzene as solvent, 0.01% by mass of 1,1-bis(t-butylperoxy)cyclohexane as polymerization initiator, and 0.17% by mass of α-methylstyrene dimer as chain transfer agent were added, and the pellet-shaped styrene resin (B) was obtained under the same conditions as the styrene resin (B1-1) (see Table 1). The average particle size of the rubber-like polymer particles was 0.59 μm. The content of styrene monomer units in the styrene-butadiene block copolymer was 35% by mass.

[0250] "Preparation of styrene-based resin (B1-3)" The styrene resin (B1-3) was synthesized by the following method.

[0251] In a raw material container equipped with an agitator, 41.4% by mass of styrene, 3.8% by mass of n-butyl acrylate, 34.9% by mass of methyl methacrylate as styrene monomers, 10.0% by mass of styrene-butadiene block copolymer (Asahi Kasei Corporation: Asaprene 625A) as rubber-like polymer, 10% by mass of ethylbenzene as solvent, 0.01% by mass of 1,1-bis(t-butylperoxy)cyclohexane as polymerization initiator, and 0.17% by mass of α-methylstyrene dimer as chain transfer agent were added, and the pellet-shaped styrene resin (B) was obtained under the same conditions as the styrene resin (B1-1) (see Table 1). The average particle size of the rubber-like polymer particles was 0.61 μm. The content of styrene monomer units in the styrene-butadiene block copolymer was 35% by mass.

[0252] "Preparation of styrene-based resin (B1-4)" The styrene resin (B1-4) was synthesized by the following method.

[0253] In a raw material container equipped with an agitator, 43.7% by mass of styrene, 9.5% by mass of n-butyl acrylate, 29.4% by mass of methyl methacrylate as styrene monomers, 9.4% by mass of styrene-butadiene block copolymer (Asahi Kasei Corporation: Asaprene 625A) as rubber-like polymer, 8% by mass of ethylbenzene as solvent, 0.01% by mass of 1,1-bis(t-butylperoxy)cyclohexane as polymerization initiator, and 0.17% by mass of α-methylstyrene dimer as chain transfer agent were added, and the pellet-shaped styrene resin (B) was obtained under the same conditions as the styrene resin (B1-1) (see Table 1). The average particle size of the rubber-like polymer particles was 0.62 μm. The content of styrene monomer units in the styrene-butadiene block copolymer was 35% by mass.

[0254] "Preparation of styrene-based resin (B1-5)" The styrene resin (B1-5) was synthesized by the following method.

[0255] In a raw material container equipped with an agitator, 41.9% by mass of styrene as a styrene monomer, 40.1% by mass of methyl methacrylate, 9.0% by mass of styrene-butadiene block copolymer (Asahi Kasei Corporation: Asaprene 625A) as a rubber-like polymer, 9% by mass of ethylbenzene as a solvent, 0.01% by mass of 1,1-bis(t-butylperoxy)cyclohexane as a polymerization initiator, and 0.17% by mass of α-methylstyrene dimer as a chain transfer agent were added, and the pellet-shaped styrene resin (B) was obtained under the same conditions as the styrene resin (B1-1) (see Table 1). The average particle size of the rubber-like polymer particles was 0.50 μm. The content of styrene monomer units in the styrene-butadiene block copolymer was 35% by mass.

[0256] [Table 1] "Preparation of styrene-based resins (B2-1) to (B2-7)" The styrene-based resins (B2-1) to (B2-7) were synthesized by the following method.

[0257] The polymerization raw material composition liquid consisting of 73.8 parts by mass of styrene as a styrene-based monomer (b1), 10.8 parts by mass of methacrylic acid as a (meth)acrylic acid ester monomer (b2), 5.4 parts by mass of methyl methacrylate as a (meth)acrylic acid monomer (b3), 10.0 parts by mass of ethylbenzene, and 0.025 parts by mass of 1,1-bis(t-butylperoxy)cyclohexane was continuously fed at a rate of 1.1 liters / hour to a polymerization apparatus consisting of a 4-liter complete mixing reactor, then a 2-liter laminar flow reactor, and then a devolatilizer connected to a single-screw extruder for removing volatile matters such as unreacted monomers and polymerization solvents, in sequence to prepare a styrene-based resin (B2-1). The polymerization reaction conditions in the polymerization process were a polymerization temperature of 118 to 128 ° C for the complete mixing reactor, and a temperature of 121 to 143 ° C for the laminar flow reactor. The devolatilized unreacted gas was condensed in a condenser through which a coolant at -5°C was passed, and recovered as an unreacted liquid.

[0258] Styrenic resins (B2-2) to (B2-7) were prepared in the same manner as for the styrene-based resin (B2-1), adjusting the conditions so that the resin properties (resin composition, styrene monomer content in the resin, total content of styrene dimer and trimer, weight average molecular weight) shown in Table 2 below were obtained.

[0259] [Table 2] "Production method of antistatic transparent oil composition of Examples 1 to 26" After preparing the raw materials according to the above-mentioned column "Raw materials used in Examples and Comparative Examples" and the following Tables 3-1 and 3-2, the weighed raw materials were blended in a drum tumbler, melt-kneaded in a twin-screw extruder (TEM-26SS manufactured by Toshiba Machine Co., Ltd.) at a cylinder set temperature of 220°C and a screw rotation speed of 150 rpm, and extruded as a molten strand. The molten strand was cooled with water and cut with a rotary cutter to obtain pellet-shaped antistatic transparent grease compositions of Examples 1 to 26. Then, according to the measurement methods described above, the physical properties of the obtained antistatic transparent grease compositions of Examples 1 to 22 were measured and evaluated. The results are shown in Tables 3-1 to 3-2.

[0260] "Methods for producing resin compositions of Comparative Examples 1 to 12" After preparing each of the raw materials according to the above-mentioned "Raw materials used in the Examples and Comparative Examples" column and the following Tables 4-1 and 4-2, the weighed raw materials were blended in a drum tumbler, melt-kneaded in a twin-screw extruder (TEM-26SS manufactured by Toshiba Machine Co., Ltd.) at a cylinder set temperature of 220°C and a screw rotation speed of 150 rpm, and extruded as a molten strand. The molten strand was cooled with water and cut with a rotary cutter to obtain pellet-shaped resin compositions of Comparative Examples 1 to 12. Then, according to the measurement methods described above, the physical properties of the obtained resin compositions of Comparative Examples 1 to 12 were measured and evaluated. The results are shown in Tables 4-1 to 4-2.

[0261] "Plate manufacturing method" The pellet-shaped antistatic transparent resin compositions obtained in Examples 1 to 26 and Comparative Examples 1 to 12 were fed into an EC-60N injection molding machine manufactured by Toshiba Machine Co., Ltd. The temperature of the resin melting zone was set to 180 to 220°C, and the resin compositions were injected into a plate molding die set at 45°C to obtain plates with a thickness of 2 mm and plates with a thickness of 1 mm. The physical properties of the plates were measured and evaluated according to the measurement methods described above. The results are shown in Tables 3-1 to 3-2 and Tables 4-1 to 4-2.

[0262] "How to manufacture ISO dumbbell test specimens" ISO dumbbell test pieces were obtained under the same conditions as in the "Plate Manufacturing Method" above, except that an ISO type A mold was used. Then, the physical properties of the plates were measured and evaluated according to the measurement methods described above. The results are shown in Tables 3-1 to 3-3 and Tables 4-1 to 4-2. [Table 3-1]

[0263] [Table 3-2]

[0264] [Table 4-1]

[0265] [Table 4-2] From the experimental results shown in Tables 3-1 to 3-2 and Tables 4-1 to 4-2 above, it is confirmed that the antistatic transparent oil composition and molded article obtained in this example have an excellent balance of transparency, impact resistance, and antistatic properties compared to the compositions and molded articles of the comparative examples. [Industrial Applicability]

[0266] The antistatic transparent resin composition and molded article of the present invention have an excellent balance of transparency, impact resistance, and antistatic properties, and therefore can be suitably used for packaging containers for electronic components, trays for packaging electronic components, magazine tubes for packaging electronic components, or carrier tapes.< / haze>

Claims

1. 5 to 50% by mass of an antistatic component (A) containing an antistatic agent (a1) having an amide bond, and An antistatic transparent resin composition containing 50 to 95% by mass of polymer component (B) comprising styrene monomer units (b1), (meth)acrylic acid ester monomer units (b2), and (meth)acrylic acid monomer units (b3).

2. The antistatic transparent resin composition according to claim 1, wherein the polymer component (B) further comprises rubbery polymer particles (C1).

3. The antistatic transparent resin composition according to claim 1 or 2, wherein the content of the styrene monomer unit (b1) is 40 to 98% by mass, the content of the (meth)acrylic acid ester monomer unit (b2) is 1 to 59.9% by mass, and the content of the (meth)acrylic acid monomer unit (b3) is 0.1 to 20% by mass, based on the total polymer component (B).

4. The antistatic transparent resin composition according to claim 1 or 2, wherein the polymer component (B) contains one or more selected from the group consisting of a styrene copolymer (B1) having the styrene monomer unit (b1) and the (meth)acrylic acid ester monomer unit (b2), and a styrene copolymer (B2) having the styrene monomer unit (b1) and the (meth)acrylic acid monomer unit (b3).

5. The antistatic transparent resin composition according to claim 4, wherein the styrene copolymer (B2) further comprises the (meth)acrylic acid ester monomer unit (b2).

6. The antistatic transparent resin composition according to claim 4, wherein the difference between the refractive index of the mixture of the antistatic agent (a1) and the styrene copolymer (B2) and the refractive index of the styrene copolymer (B1) is 0.03 or less.

7. A molded article using the antistatic resin composition according to claim 1 or 2.

8. A sheet obtained by extruding the antistatic resin composition according to claim 1 or 2.

9. A laminated sheet having a base layer and an antistatic layer containing the antistatic resin composition according to claim 1 or 2, laminated on one or both surfaces of the base layer.

10. An electronic component packaging container using the antistatic resin composition according to claim 1 or 2.

11. An electronic component packaging container using the sheet described in claim 8.

12. An electronic component packaging container using the sheet described in claim 9.

13. A magazine tube for packaging electronic components obtained by extruding the antistatic resin composition according to claim 1 or 2.

14. A tray for packaging electronic components using the antistatic resin composition according to claim 1 or 2.

15. A carrier tape using the sheet described in claim 8.

16. A carrier tape using the sheet described in claim 9.

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