Laminated sheet, carrier tape and method for producing laminated sheet

Abstract

To provide a laminated sheet, and a molding and a carrier tape which use the same.SOLUTION: A laminated sheet has a base material, and an antistatic layer which is stacked on one side or both the sides of the base material and contains an antistatic resin composition, wherein the antistatic layer contains 10 to 30 mass% of the following component (A), 50 to 90 mass% of the following component (B1), and 3 to 20 mass% of the following component (B2), a haze value of the laminated sheet is 15% or less, and the base material is composed of the following component (B1). Component (A): antistatic agent (a1) having an amide bond. Component (B1): impact-resistant polyethylene (B1). Component (B2): styrene-unsaturated carboxylic acid-based resin (B2) containing a styrenic monomer unit (b2-1) and a (meth)acrylic acid-based monomer unit (b2).SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a laminate sheet, a carrier tape, and a method for manufacturing a laminate sheet. [Background technology]

[0002] Tape-type packaging materials are used to package chip-type electronic components, including semiconductor integrated circuits. These packaging materials consist of a carrier tape, a long sheet with multiple recesses formed at predetermined intervals, and a cover tape that is heat-sealed to the carrier tape. Resin sheets used to form such carrier tapes must have good formability (embossability) to prevent holes or cracks during embossing, and mechanical strength to protect the packaged electronic components. Furthermore, they must have good transparency, allowing the electronic components inside to be visually inspected and the characters printed on the packaged electronic components to be detected from the outside. Recently, in response to demands for miniaturization of electronic components and for increased speed in mounting, there has been a demand for antistatic properties as a countermeasure against static electricity.

[0003] Generally, polycarbonate resins, polyethylene terephthalate resins, etc. are used as materials for resin sheets for forming carrier tapes. Among them, Patent Documents 1 and 2 are cited as examples of technologies relating to rubber-modified styrene polymers having good mechanical strength, formability, and transparency. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 3812965 [Patent Document 2] Japanese Patent Application Laid-Open No. 2003-055526 Summary of the Invention [Problem to be solved by the invention]

[0005] However, with conventional laminate sheets for carrier tapes, it is difficult to achieve a satisfactory balance of the various physical properties, such as the mechanical strength, transparency, antistatic properties, and formability, as described above. Furthermore, when extrusion molding a raw sheet of carrier tape, it is common for parts that do not become part of the product to be crushed, pelletized, and then re-used as a reworking operation. However, in the case of laminated sheets, the composition of the base material and the surface layer is different, so a decrease in transparency is unavoidable.

[0006] Therefore, an object of the present disclosure is to solve the above problems and provide a laminate sheet for a carrier tape that achieves both excellent transparency and high antistatic performance at a high level. [Means for solving the problem]

[0007] The present inventors have conducted extensive research to solve the above problems and have completed the present invention as described below. [1] A laminated sheet having a substrate and an antistatic layer containing an antistatic resin composition laminated on one or both surfaces of the substrate, the antistatic layer contains 10 to 50% by mass of the following component (A), 50 to 90% by mass of the following component (B1), and 3 to 20% by mass of the following component (B2), A laminate sheet, wherein the substrate has a haze value of 15% or less and is composed of the following component (B1): Component (A): Antistatic agent (a1) having an amide bond (B1) Ingredient: High-impact polystyrene (B1) Component (B2): a styrene copolymer containing a styrene monomer unit (b2-1) and a (meth)acrylic acid monomer unit (b2)

[0008] [2] The refractive index (23°C) of the impact-resistant polystyrene (B1), the styrene-unsaturated carboxylic acid resin (B2), and the antistatic agent (a1) is n B1 , n B2 , n A Then, n A <n B1 <nB2 The laminated sheet according to [1], wherein the following relationship holds:

[0009] [3] The laminate sheet according to [1] or [2], wherein the (meth)acrylic acid-based monomer unit (b2) comprises one or more monomer units selected from the group consisting of the (meth)acrylic acid ester monomer unit (b2-2) and the (meth)acrylic acid monomer unit (b2-3).

[0010] [4] The laminate sheet according to any one of [1] to [3], wherein the high-impact polystyrene (B1) comprises styrene-based monomer units (b1-1), (meth)acrylic acid ester monomer units (b1-2), and rubber-like polymer particles (C1), and contains 30 to 55 mass% of the styrene-based monomer units (b1-1) and 30 to 55 mass% of the (meth)acrylic acid ester monomer units (b1-2) relative to the total amount of the high-impact polystyrene (B1).

[0011] [5] The laminate sheet according to any one of [1] to [4], which contains 1 to 20 mass% of the (meth)acrylic acid ester monomer units (b2-2) and 2 to 30 mass% of the (meth)acrylic acid monomer units (b2-3) relative to the total amount of the styrene-unsaturated carboxylic acid resin (B2).

[0012] [6] A carrier tape obtained by processing the laminated sheet according to any one of [1] to [5].

[0013] [7] Impact-resistant polystyrene (B1) containing styrene-based monomer units (b1-1), (meth)acrylic acid ester monomer units (b1-2), and rubber-like polymer particles (C1); a styrene-unsaturated carboxylic acid resin (B2) having a refractive index higher than that of the impact resistant polystyrene (B1), the resin containing a styrene monomer unit (b2-1) and a (meth)acrylic acid monomer unit (b2); A method for producing a laminate sheet using, as a surface layer, transparent antistatic pellets obtained by kneading an antistatic agent (a1) having an amide bond and having a refractive index smaller than that of the impact resistant polystyrene (B1). [Effects of the Invention]

[0014] According to the present invention, there is provided a laminate sheet for a carrier tape which combines excellent transparency and high antistatic performance to a high degree. Another object of the present invention is to provide a laminate sheet that exhibits good transparency during rework and a carrier tape using the same. [Brief explanation of the drawings]

[0015] [Figure 1] FIG. 1 is a perspective view showing how electronic components are stored using a carrier tape formed from the laminated sheet of this embodiment. [Figure 2] FIG. 2 is a perspective view showing a process of storing and sealing electronic components using a packaging material for transporting electronic components, which is provided with a carrier tape formed from the laminated sheet of this embodiment and a cover tape. DETAILED DESCRIPTION OF THE INVENTION

[0016] 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 modifications within the scope of its gist. The present disclosure provides a laminate sheet having a substrate and an antistatic layer containing an antistatic resin composition laminated on one or both surfaces of the substrate, the antistatic layer contains the following component (A) in an amount of 10 to 30% by mass, the following component (B1) in an amount of 50 to 90% by mass, and the following component (B2) in an amount of 3 to 20% by mass, The laminate sheet has a haze value of 15% or less, and the substrate is composed of the following component (B1): Component (A): Antistatic agent (a1) having an amide bond (B1) Ingredient: High-impact polystyrene (B1) Component (B2): A styrene-unsaturated carboxylic acid resin (B2) containing a styrene monomer unit (b2-1) and a (meth)acrylic acid monomer unit (b2). This allows the effects of excellent antistatic properties and folding endurance to be achieved without impairing the transparency of polystyrene-based resins. Below, an outline of the laminate sheet will be explained, followed by a detailed description of each of the constituent members of the laminate sheet and the components of each of the constituent members.

[0017] [Laminated sheet] The laminate sheet of the present embodiment has a substrate and an antistatic layer containing an antistatic resin composition laminated on one or both surfaces of the substrate. The average thickness of the laminate sheet of this embodiment is preferably 220 to 550 μm, and more preferably 250 to 500 μm. A preferred configuration of the laminate sheet of this embodiment includes antistatic layers containing an antistatic resin composition laminated on both surfaces of the substrate. The antistatic layers can cover a part or the entire surface of the substrate. The total light transmittance of the laminate sheet of this embodiment is preferably 85% or more, more preferably 86% or more, and even more preferably 87% or more. In this specification, the total light transmittance was measured in accordance with the standard of JIS K 7361-1. The haze value (thickness: 500 μm) of the laminate sheet of this embodiment is preferably 15% or less, more preferably 13% or less, and even more preferably 10% or less. The haze value in this specification was measured in accordance with the standard of JIS K 7105. When the haze value is within the above range, a certain level of transparency can be ensured, which is advantageous in that the contents of a container formed from the laminate sheet can be visually confirmed. In particular, when the haze value is 10% or less, excellent transparency can be exhibited. When the laminate sheet of the present embodiment has a substrate and an antistatic layer containing an antistatic resin composition laminated on one side of the substrate, the ratio of the average thickness of the substrate to the average thickness of the antistatic layer is preferably in the range of 15 / 85 to 5 / 95, from the viewpoint of the balance between transparency and surface resistivity. When the laminate sheet of the present embodiment has a substrate and antistatic layers containing an antistatic resin composition laminated on both surfaces of the substrate, the ratio of the average thickness of the first antistatic layer / the average thickness of the substrate / the average thickness of the second antistatic layer is preferably in the range of 15 / 70 / 15 to 3 / 94 / 3, from the viewpoint of the balance between transparency and surface resistivity.

[0018] <Base material> The average thickness of the substrate of this embodiment is preferably 140 to 520 μm, more preferably 160 to 500 μm, and even more preferably 175 to 475 μm. The total light transmittance of the substrate of this embodiment is preferably 89% or more, more preferably 90% or more, and even more preferably 91% or more. The haze value of the substrate of this embodiment is preferably 10% or less, more preferably 8% or less, and even more preferably 6% or less. When the haze value is within the above range, a certain level of transparency can be ensured, which is advantageous in that the contents of a container formed from the laminate sheet can be visually confirmed.

[0019] The substrate of this embodiment contains high-impact polystyrene (B1) as component (B1). The content of high-impact polystyrene (B1) in the substrate is preferably 85% by mass or more and 100% by mass or less, more preferably 90% by mass or more and 100% by mass or less, and even more preferably 96% by mass or more and 100% by mass or less, based on the total amount (100% by mass) of the substrate. The substrate of this embodiment can be formed from a resin composition for substrates. The resin composition for substrates contains, as component (B1), a high-impact polystyrene (B1) in an amount of preferably 90 to 100 mass%, more preferably 95 to 100 mass%, based on the total amount (100 mass%) of the resin composition for substrates. By making the content of component (B1) in the substrate 90 mass% or more, the effect of imparting folding endurance can be sufficiently obtained, and by making it 100 mass% or less, the effect of improving antistatic properties (and transparency) can be sufficiently obtained. The substrate or resin composition for a substrate of this embodiment may contain an antistatic resin composition or antistatic layer, as described below, if necessary. From the viewpoint of recycling, scraps of a used or manufactured laminate sheet may be crushed, mixed with the resin composition for a substrate, and then remelted. For example, the components of the antistatic resin composition or antistatic layer contained in the laminate sheet may be approximately 10% by mass or less relative to the total amount (100% by mass) of the resin composition for a substrate.

[0020] "Impact-resistant polystyrene (B1)" The high-impact polystyrene (B1) as component (B1) of this embodiment contains a continuous phase (=polymer matrix phase) made of a styrene copolymer and rubber-like polymer particles (C1). In other words, the high-impact polystyrene (B1) has a sea-island structure in which the continuous phase (=polymer matrix phase) made of a styrene copolymer forms the sea phase and the rubber-like polymer particles (C1) form the island phase. The high-impact polystyrene (B1) preferably has a structure in which the rubber-like polymer particles (C1) are dispersed in the continuous phase made of a styrene copolymer, and specific examples include conventional HIPS and ABS resins.

[0021] The high impact polystyrene (B1) is preferably a HIPS having a continuous phase composed of styrene-based monomer units (b1-1) and (meth)acrylic acid ester monomer units (b2) so as to match the refractive index with that of the dispersed particles composed of rubber-like polymer particles (C1), and the haze value of a 2 mm plate of the high impact polystyrene (B1) can be 10% or less. Furthermore, the high impact polystyrene (B1) may further contain other monomer units in addition to the styrene monomer units (b1-1) and the (meth)acrylic acid ester monomer units (b1-2) as required.

[0022] The refractive index (27° C.) of the high impact polystyrene (B1) 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 1.545 or greater and not greater than 1.550.

[0023] <Continuous phase> The styrene copolymer constituting the continuous phase of the component (B1) in this embodiment is not particularly limited as long as it is a binary or higher copolymer containing a styrene monomer unit (b1-1) and a (meth)acrylic acid ester monomer unit (b1-2). It is preferably a binary to quaternary copolymer, more preferably a binary to ternary copolymer, and particularly preferably a ternary copolymer. That is, the styrene copolymer in this embodiment is preferably a terpolymer containing a styrene monomer unit (b1-1) and two types of (meth)acrylic acid ester monomer units (b1-2). This allows for the provision of a styrene resin composition with an excellent balance of fluidity, impact resistance, folding endurance, and transparency. The styrene copolymer may be a random copolymer, a block copolymer, or an alternating copolymer, but is preferably a random copolymer. Therefore, the continuous phase of the impact-resistant polystyrene (B1), which is the component (B1), is preferably composed solely of a random copolymer. In this embodiment, the weight-average molecular weight (Mw) of the styrene copolymer constituting the continuous phase of component (B1) is preferably 70,000 to 300,000, more preferably 80,000 to 250,000, even more preferably 100,000 to 230,000, still more preferably 105,000 to 210,000, and particularly preferably 110,000 to 200,000. When the weight-average molecular weight is 70,000 to 300,000, a resin having an excellent practical balance between impact strength and fluidity can be obtained. The weight average molecular weight can be measured by gel permeation chromatography using polystyrene as the standard.

[0024] -Styrene-based monomer unit (b1-1)- In this embodiment, the styrene-based monomer (b1-1) is not particularly limited, but examples thereof include styrene, α-methylstyrene, β-methylstyrene, paramethylstyrene, orthomethylstyrene, metamethylstyrene, chlorostyrene, and bromostyrene. From an industrial viewpoint, styrene and α-methylstyrene are particularly preferred, and styrene is more preferred. As the styrene-based monomer (b1-1), these may be used alone or in combination of two or more. In this specification, the term "styrene-based monomer unit (b1-1)" refers to a repeating unit constituting a polymer obtained by polymerizing a styrene-based monomer (b1-1), and is a repeating unit (or structural unit) in which the carbon-carbon double bond in the styrene-based monomer (b1-1) is converted to a single bond (-CC-) through a polymerization reaction or crosslinking reaction of the styrene-based monomer (b1). Other monomer units in this specification have the same meaning. In this specification, the styrene-based monomer unit (b1-1) can be either a styrene-based monomer obtained from chemical recycling or a styrene-based monomer derived from biomass. For example, technologies for obtaining styrene-based monomers from chemical recycling include Japanese Patent No. 4161293, JP 2021-134281 A, and WO 2021 / 230312. In addition, the content of Technical Report No. 2023-501115 can be cited as a technology related to biomass-derived styrene-based monomers. The same applies to the styrene-based monomer unit (b2-1) described below.

[0025] In a preferred embodiment of the impact polystyrene (B1) of this embodiment, the content of the styrene monomer (b1-1) in the entire impact polystyrene (B1) is determined from the viewpoint of ensuring the transparency of the impact polystyrene (B1) and adjusting the refractive index difference between the continuous phase and the rubbery polymer particles (C1) to fall within a predetermined range. Therefore, the content of the styrene monomer unit (b1-1) is determined depending on the type of the rubbery polymer particles (C1), and is, for example, preferably 20 to 99 mass%, more preferably 30 to 70 mass%, and even more preferably 42 to 52 mass% of the entire styrene copolymer.

[0026] -(Meth)acrylic acid ester monomer unit (b1-2)- The (meth)acrylic acid ester monomer unit (b1-2) is a monomer represented by the following general formula (1): [ka] (In the above general formula (1), R 1represents a hydrogen atom or an alkyl group having 1 to 3 carbon atoms, and R 2 represents an ester substituent, and represents an alkyl group having 1 to 12 carbon atoms. In this embodiment, the ester substituent (R 2 The number of carbon atoms in the alkyl group is preferably 10 or less, more preferably 8 or less, and even more preferably 4 or less. If the number of carbon atoms in the alkyl group exceeds 10, the heat resistance is significantly reduced, which is not preferred.

[0027] In this embodiment, the (meth)acrylic acid ester monomer unit (b1-2) is preferably a (meth)acrylic acid ester monomer unit (b1-2) 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 thereof 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. In the present embodiment, a suitable (meth)acrylic acid ester monomer unit (b1-2) is, for example, a (meth)acrylic acid ester monomer unit represented by the above general formula (1), wherein R 1 is a hydrogen atom or a methyl group, and R 2 is an ester substituent, and is preferably an alkyl chain having 1 to 6 carbon atoms. In this embodiment, specific examples of the monomer that is a precursor of the (meth)acrylic acid ester monomer unit (b1-2) 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, or t-butyl (meth)acrylate.

[0028] The styrene copolymer constituting the continuous phase of the component (B1) in this embodiment may contain (meth)acrylic acid monomer units (b1-3). The content of the (meth)acrylic acid monomer units (b1-3) may be 0% by mass or more and 15% by mass or less based on the total mass of the styrene copolymer.

[0029] In a preferred embodiment of the component (B1) of this embodiment, the content of the (meth)acrylic acid ester monomer (b1-2) in the entire component (B1) is preferably adjusted so that the refractive index of the copolymer of the styrene-based monomer (b1-1) and the (meth)acrylic acid ester monomer (b1-2) is equivalent to the refractive index of the rubber-like polymer particles (C1). The content of the (meth)acrylic acid ester monomer unit (b1-2) is preferably in the range of 10 to 90 mass %, more preferably 20 to 80 mass %, even more preferably 30 to 70 mass %, still more preferably 45 to 60 mass %, and particularly preferably 48 to 58 mass %, based on the entire styrene-based copolymer which is a component of the continuous phase.

[0030] In the impact-resistant polystyrene (B1) as component (B1) of this embodiment, the content of the styrene-based monomer (b1-1) and the (meth)acrylic acid ester monomer (b1-2) is preferably such that the difference in refractive index between the styrene-based copolymer, which is a copolymer of the styrene-based monomer (b1-1) and the (meth)acrylic acid ester monomer (b1-2), and the rubber-like polymer particles (C1) is 0.03 or less, more preferably 0.02 or less, and even more preferably 0.01 or less. By adjusting the content so that the difference in refractive index is 0.03 or less, good transparency can be obtained. Furthermore, by adjusting the content of the (meth)acrylic acid ester monomer unit (b1-2) to 50% by mass or less, water absorption can be suppressed.

[0031] <Rubber-like polymer particles (C1)> The high-impact polystyrene (B1) of the component (B1) in this embodiment contains rubbery polymer particles (C1). The rubbery polymer particles (C1) may be any particle containing a rubbery polymer (c1). Therefore, the rubbery polymer particles (C1) may have the following morphology: solid particles made of the rubbery polymer (c1), hollow particles made of the rubbery polymer (c1), encapsulated particles (including microphase-separated structures, core-shell structures, and salami-type structures) in which a styrene-based copolymer-containing phase constituting a continuous phase is encapsulated within the rubbery polymer (c1) or the rubbery polymer particles (C1), and surface-grafted particles in which the styrene-based copolymer is grafted onto the surface. These morphologies may also be combined. Preferred forms of the rubbery polymer particles (C1) of this embodiment include surface-grafted particles in which a styrene copolymer is grafted onto the surface of a solid particle made of a rubbery polymer (c1), and surface-grafted encapsulated particles in which a styrene copolymer is grafted onto the surface of encapsulated particles (including microphase-separated structures, core-shell structures, and salami-type structures) in which a phase containing a styrene copolymer is encapsulated within the rubbery polymer (c1). Of these, the rubbery polymer particles (C1) are preferably the above-mentioned surface-grafted particles, encapsulated particles (including microphase-separated structures, core-shell structures, and salami-type structures), and surface-grafted encapsulated particles.

[0032] -Average particle size of rubber-like polymer particles (C1)- In this embodiment, the weight average diameter (dv) of all the rubbery polymer particles (C1) contained in the substrate or resin composition for a substrate is preferably 0.2 μm to 2.0 μm, more preferably 0.3 μm to 1.5 μm, and even more preferably 0.4 μm to 1.3 μm. In one embodiment where the weight average diameter of all the rubbery polymer particles (C1) (also referred to as all rubbery polymer particles (C1)) in the substrate or resin composition for a substrate is within the above-mentioned specific range, the rubbery polymer particles (C1) preferably have an integral distribution curve obtained by integrating the particle size distribution of the rubbery polymer particles (C1), where the difference (hereinafter referred to as d80%-d20%) between the 20% diameter (d20%) at which the integrated value of the frequency (%) (hereinafter referred to as the integrated value) is 20% and the 80% diameter (d80%) at which the integrated value of the frequency (%) is 80% is 0.15 to 2.0 μm. This makes it easier to achieve both excellent impact resistance and folding resistance. The details of why this is the case are unclear, but if the thickness is 0.15 μm or less, even if the sheet has rigidity, it will be inferior in terms of practical strength as a sheet, such as impact resistance and folding resistance, and the balance between rigidity and strength will be poor, and if the thickness is 2.0 μm or more, transparency will decrease, resulting in a poor balance between transparency and impact resistance and folding resistance. The above d80%-d20%, 80% diameter and 20% diameter are calculated by the method described in the Examples below.

[0033] Furthermore, the 80% diameter (d80%) when the integrated value of frequency (%) is 80% and the 20% diameter (d20%) when the integrated value of frequency (%) is 20% by volume refer to the weight average diameters corresponding to integrated values ​​of 20% and 80%, respectively, on an integral distribution curve in which the horizontal axis represents the equivalent circle diameter and the vertical axis represents the integrated value of frequency (%) (integrated value of the volume fraction (%) of rubber-like polymer particles (C1) having various equivalent circle diameters). In this specification, "particle size distribution" refers to a distribution in which the horizontal axis indicates the equivalent circle diameter and the vertical axis indicates the frequency (%) ( The particle size distribution of the rubber-like polymer particles (C1) refers to the particle size distribution of the rubber-like polymer particles (C1) when the volume fraction (%) of the rubber-like polymer particles (C1) having various equivalent circle diameters is shown. In this specification, the term "integral distribution curve" refers to a curve obtained by integrating the equivalent circle diameters of the rubber-like polymer particles (C1) when the horizontal axis represents the equivalent circle diameter and the vertical axis represents the integrated value of the frequency (%) (integrated value of the volume fraction (%) of the rubber-like polymer particles (C1) having various equivalent circle diameters). The integral distribution curve is also a function obtained by integrating the particle size distribution. The volume fraction indicates the volume ratio when the rubber-like polymer particles (C1) obtained in the measurement of the weight-average diameter are regarded as spheres.

[0034] In this embodiment, it is preferred that 60% or more of the total number of rubbery polymer particles (C1) present in the substrate or resin composition for a substrate contain the styrene copolymer constituting the continuous phase of component (B1), and more preferably 80% or more contain the styrene copolymer constituting component (B1). Furthermore, 60% or more of the total number of rubbery polymer particles (C1) present in the substrate or resin composition for a substrate have a salami structure in which multiple phases containing the copolymer constituting component (B1) (e.g., a copolymer of styrene-based monomer units (b1) and (meth)acrylic acid ester monomer units (b2)) are contained within the rubbery polymer particles (C1). Furthermore, in this embodiment, the lower limit of the proportion (number) of the salami structure in all rubbery polymer particles (C1) in the substrate or resin composition for a substrate 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. This makes it possible to provide a laminate sheet with improved impact resistance, folding resistance and transparency.

[0035] The number of particles containing a polymer phase containing a styrene copolymer (e.g., polystyrene, or a styrene copolymer having styrene monomer units (b1-1) and (meth)acrylic acid ester monomer units (b1-2) and, if necessary, (meth)acrylic acid monomer units (b1-3)) in all rubber-like polymer particles (C1) in the substrate or resin composition for a substrate and the proportion of salami-shaped structures are calculated by number-average measurements using a transmission electron microscope. Specifically, as shown in the examples below, five ultrathin sections each 100 nm thick were prepared from an 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. Of 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 rubber-like polymer particles (C1). The percentage was calculated by dividing the number of salami-shaped rubber-like polymer particles (C1) by the total number of rubber-like polymer particles (C1) appearing in the ten images.

[0036] The material used for the rubbery polymer particles (C1) (or rubbery polymer (c1)) of this embodiment may have a conjugated diene structure. Therefore, the rubbery polymer (c1) of this embodiment preferably has a conjugated diene structure, and is preferably, for example, a conjugated diene-based polymer. The rubbery polymer (c1) may be, for example, polybutadiene, polyisoprene, natural rubber, polychloroprene, styrene-butadiene copolymer, acrylonitrile-butadiene copolymer, or the like. Of these, polybutadiene or styrene-butadiene copolymer is preferred. One or more types of these rubbery polymer particles (C1) may be used.

[0037] <Characteristics of impact-resistant polystyrene (B1)> The contents of the styrene-based monomer units (b1-1), the (meth)acrylic acid ester monomer units (b1-2), and the (meth)acrylic acid monomer units (b1-3) in the impact-resistant polystyrene (B1) of this embodiment can be quantified using pyrolysis GC / MS with a calibration curve prepared from a resin in which the contents of each monomer unit are known. The melt flow rate of the high-impact polystyrene (B1) at 200°C in this embodiment is preferably 0.3 to 6.0, more preferably 0.5 to 5.5, and even more preferably 1.0 to 5.0. A melt flow rate of 0.3 or more is preferred from the viewpoint of fluidity, and a melt flow rate of 5.0 or less is preferred from the viewpoint of the mechanical strength of the resin. In the present disclosure, the melt flow rate is a value measured in accordance with ISO 1133 at 200°C under a load of 49 N.

[0038] The weight average molecular weight (Mw) of the high impact polystyrene (B1) in this embodiment is preferably 70,000 to 300,000, more preferably 80,000 to 250,000, even more preferably 100,000 to 230,000, still more preferably 105,000 to 210,000, and particularly preferably 110,000 to 200,000. When the weight average molecular weight is 70,000 to 300,000, a resin having an excellent practical balance between impact strength and fluidity can be obtained.

[0039] <Method for producing high impact polystyrene (B1)> The production method of the impact polystyrene (B1) of this embodiment is not particularly limited, but it can be produced by bulk polymerization (or solution polymerization) in which a styrene-based monomer (b1-1) and a (meth)acrylic acid ester monomer (b1-2) (and a solvent) are polymerized in the presence of a rubber-like polymer (c1), or by bulk-suspension polymerization, which transitions to suspension polymerization during the reaction, or by emulsion graft polymerization in which a styrene-based monomer (b1-1) and a (meth)acrylic acid ester monomer (b1-2) are polymerized in the presence of a rubber-like polymer (c1) latex. In bulk polymerization, the impact polystyrene (B1) can be produced by continuously supplying a mixed solution containing the rubber-like polymer (c1), the styrene-based monomer (b1-1), and the (meth)acrylic acid ester monomer (b1-2), and optionally an organic solvent, an organic peroxide, and / or a chain transfer agent, to a polymerization apparatus configured as a complete mixing reactor or a tank reactor connected in series with multiple tank reactors.

[0040] "Antistatic layer" The average thickness of the antistatic layer of the present embodiment is preferably 5 to 25 μm, more preferably 6 to 24 μm, and even more preferably 7 to 23 μm. The antistatic layer of the present embodiment includes an antistatic resin composition. The antistatic layer may be formed from the antistatic resin composition. The content of the antistatic resin composition may be preferably 97 to 100% by mass of the entire antistatic layer.

[0041] In this embodiment, the antistatic layer or the antistatic resin composition contains an antistatic agent (a1) having an amide bond as the component (A), a high-impact polystyrene (B1) as the component (B1), and a styrene-unsaturated carboxylic acid resin (B2) as the component (B2). The antistatic layer or the antistatic resin composition contains 10 to 30 mass % of the component (A), 50 to 90 mass % of the component (B1), and 3 to 20 mass % of the component (B2). This provides the effect of highly improving the surface resistivity and transparency. Furthermore, within the above composition range, improvement in heat resistance can also be expected.

[0042] The antistatic layer of this embodiment contains an antistatic agent (a1) having an amide bond as component (A). The content of the antistatic agent in the antistatic layer or the antistatic resin composition is preferably from 13 to 25% by mass, more preferably from 14 to 23% by mass, and even more preferably from 15 to 21% by mass, relative to the total amount (100% by mass) of the antistatic layer or the antistatic resin composition. By setting the content of the component (A) in the antistatic layer within the above range, it is possible to obtain a sufficient effect of improving antistatic properties.

[0043] The antistatic layer of this embodiment contains high-impact polystyrene (B1) as the component (B1). The content of the high-impact polystyrene (B1) in the antistatic layer or the antistatic resin composition is preferably 55% by mass or more and 88% by mass or less, more preferably 60% by mass or more and 87% by mass or less, and even more preferably 65% ​​by mass or more and 87% by mass or less, relative to the total amount (100% by mass) of the antistatic layer or the antistatic resin composition. By ensuring that the content of the (B1) component in the antistatic layer is 55% by mass or more, the effect of imparting folding endurance can be sufficiently obtained, and by ensuring that the content is 88% by mass or less, the effect of improving antistatic properties and transparency can be sufficiently obtained.

[0044] The antistatic layer of this embodiment contains a styrene-unsaturated carboxylic acid resin (B2) as component (B2). The content of the styrene-unsaturated carboxylic acid resin (B2) in the antistatic layer or antistatic resin composition is preferably more than 3 mass % and not more than 20 mass %, more preferably 3.2 mass % to 17 mass %, more preferably 3.2 mass % to 15 mass %, and even more preferably 3.4 mass % to 12 mass %, relative to the total amount (100 mass %) of the antistatic layer or antistatic resin composition. By setting the content of the (B2) component in the antistatic layer to more than 3% by mass, the dispersibility and transparency of the antistatic agent (a1) can be sufficiently improved, and by setting the content to 20% by mass or less, the antistatic properties, transparency, and dispersibility can be sufficiently improved.

[0045] The components of the antistatic layer or antistatic resin composition of this embodiment, namely, the antistatic agent (a1) having an amide bond, the styrene-unsaturated carboxylic acid resin (B2), and any additional components, are described in detail below. Note that the impact-resistant polystyrene (B1) contained in the antistatic layer or antistatic resin composition is the same as the impact-resistant polystyrene (B1) contained in the substrate.

[0046] "Antistatic agent (a1) having an amide bond" The antistatic layer or antistatic resin composition of this embodiment contains an antistatic agent (a1) having an amide bond. The antistatic agent (a1) is responsible for the excellent antistatic properties of the antistatic layer or the entire composition of this disclosure. The antistatic layer or antistatic resin composition of this embodiment may contain an antistatic agent (a1) having an amide bond, and may also contain an antistatic agent (a2) other than the antistatic agent (a1) having an amide bond, or a known ionic liquid or ionic surfactant. A suitable antistatic layer or antistatic resin composition of this embodiment preferably contains the antistatic agent (a2) in an amount of 0% to 2% by mass, based on the total amount (100% by mass) of the antistatic layer or antistatic resin composition. Similarly, a suitable antistatic layer or antistatic resin composition of this embodiment preferably contains the ionic liquid or ionic surfactant in an amount of 0% to 2% by mass, based on the total amount (100% by mass) of the antistatic layer or antistatic resin composition.

[0047] The antistatic agent (a1) of the present embodiment is a block copolymer (A1) having a soft segment and a hard segment, and more specifically, is preferably a polyetheramide block copolymer (A1-1) (hereinafter also simply referred to as block copolymer (A1-1)) having a polyoxyalkylene block (also referred to as a polyether block) as a soft segment and an amide block as 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. The polyether blocks absorb moisture from the environment, ionize water, and conduct protons, thereby dissipating static electricity and attenuating the charged voltage, and the antistatic layer or the antistatic resin composition of the present disclosure as a whole exhibits sustained antistatic properties.

[0048] The antistatic agent (a1) having an amide bond of this embodiment may be, for example, a polyetheresteramide block copolymer (A1-2) in which a (poly)ester block having a reactive group at its terminal, a polyether block having a polyoxyalkylene as its main structure, and an amide block having an amide bond having a reactive group at its terminal are repeatedly and alternately bonded. The antistatic agent (a1) of this embodiment may be a synthetic product or may be selected from commonly available products. In particular, when the antistatic agent (a1) has an amide bond, the impact resistance and transparency of the antistatic layer or the entire antistatic resin composition are improved. In this embodiment, the antistatic agent (a1) may be a single block copolymer (A1) or a mixture of multiple block copolymers (A1). In this case, the antistatic agent (a1) preferably contains at least one block copolymer (A1) having an amide bond.

[0049] The antistatic agent (a1) of this 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, and the content of the polyether block skeleton is preferably 10 to 90% by mass based on the entire molecule of the antistatic agent (a1).

[0050] The antistatic agent (a1) of this embodiment is preferably a block copolymer (A1) having a polyether block as a soft segment and an amide block as a hard segment, and 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).

[0051] 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): [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. (In the above general formula (II), M 2 represents a divalent organic group, and L 1 and L 2 are each independently -C(=O)-O-, -C(=O)-, -O-, -OC(=O)-, or -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, or an isopropyl group), and 1 represents the degree of polymerization. (In the above general formula (III), M 3 represents a divalent organic group, and L 3 and L4 are each independently -C(=O)-O-, -C(=O)-, -O-, -OC(=O)-, or -C(=O)-NR 1 -, -NR 2 -C(=O)- or -NR 3 -, n represents the degree of polymerization, and 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, or an isopropyl group).

[0052] In the above general formula (I), the alkylene group may be 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. 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. 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 preferred. The divalent aromatic group preferably has an aromatic ring and 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 include a monocyclic aromatic ring, a fused 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 fused 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. 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 alkoxylen 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. The alkylene group may be 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, an octylene group, a nonylene group, a decylene group, an undecylene group, and a dodecylene group. 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. Examples of the alkoxysilane group include groups in which one arbitrary 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. Examples of the arylene group include groups in which one arbitrary 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. Examples of the aralkylene group include groups in which one arbitrary hydrogen atom has been removed from an aralkyl group selected from the group consisting of a benzyl group, a diphenylmethyl group, a biphenyl group, and a naphthylmethyl group. 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. Particularly preferred M in the above general formula (II) 2 The group may be an arylene group having 6 to 12 carbon atoms. L in the above general formula (II) 1 -C(=O)-O-, -OC(=O)-, -C(=O)-NR 1 -or-NR 2 It is preferably -C(=O)-. L in the above general formula (III) 2 -C(=O)-O-, -OC(=O)-, -C(=O)-NR 1 -or-NR 2 It is preferably -C(=O)-. In the above general formula (II), L 1 and L 2 may be the same as or different from each other. In the general formula (III) above, 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 divalent aliphatic hydrocarbon group are as described above. 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 alkoxylen 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. L in the above general formula (III) 3 is preferably —C(═O)—, —C(═O)—NH—, —NH—C(═O)— or —NH—. L in the above general formula (III) 4 is preferably —C(═O)—, —C(═O)—NH—, —NH—C(═O)— or —NH—. In the above general formula (III), L 3 and L 4 may be the same as or different from each other. 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.

[0053] The block copolymer (A1) of this embodiment may be a copolycondensate of an amide block as a hard segment and a polyoxyalkylene block having a terminal with a functional group as a soft segment. In other words, the block copolymer (A1) of this embodiment is a copolycondensate of the following reaction raw materials: an amide block (=(poly)amide polymer) having a first functional group (e.g., a hydroxyl group, an amino group, or a carboxylic acid group) at at least one terminal; and a polyoxyalkylene block (=polyether polymer) having a second functional group (e.g., a hydroxyl group, an amino group, or a carboxylic acid group) at at least one terminal that is polycondensable with the first functional group. A preferred embodiment of the block copolymer (A1) of this embodiment is a copolycondensate obtained from reaction raw materials: an amide block (=(poly)amide polymer) having a first functional group (e.g., a hydroxyl group, an amino group, or a carboxylic acid group) at at least one end; a polyoxyalkylene block (=polyether polymer) having a second functional group (e.g., a hydroxyl group, an amino group, or 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, or a carboxylic acid group) at at least one end. The block copolymer (A1) of this embodiment is preferably 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 polyetheresteramide copolymer (A1-2). The reactants for the dicarboxylic acid-terminated amide block (e.g., 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. The α,ω-aminocarboxylic acid compounds include aminoundecanoic acid and aminododecanoic acid. The lactam compounds include caprolactam and lauryllactam. The dicarboxylic acid compounds include adipic acid, sebacic acid, isophthalic acid, butanedioic acid, 1,4-cyclohexyldicarboxylic acid, terephthalic acid, sodium sulfoisophthalate, decanedioic acid, and dodecanedioic acid. Examples of 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).

[0054] Another aspect of the block copolymer (A1) of the present embodiment is preferably a polycondensate obtained by polycondensing a compound (=polyether block) selected from the group consisting of diol compounds having a polyoxyalkylene group and diamine compounds having a polyoxyalkylene group with an amide block having two or more carboxyl groups per molecule, and more preferably a polycondensate having a 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 per molecule, and a diol compound having an ester group (=ester block).

[0055] 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 produced using a diol compound or a diamine compound having an oxyalkylene group as a reaction raw material. 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 is reacted with an alkylene oxide as reaction raw materials. The addition may be carried out by a known method. For example, the addition may be carried out in one step or multiple steps under normal pressure or elevated pressure without a catalyst or in the presence of a catalyst (alkali catalyst, amine catalyst, or acid catalyst). The diamine compound having a polyoxyalkylene group can be a compound obtained by modifying the terminal hydroxyl groups of the diol compound having a polyoxyalkylene group to amino groups. The method for modifying the terminal hydroxyl groups of the diol compound having a polyoxyalkylene group to amino groups can be a known method. For example, a method can be used in which the terminal hydroxyl groups of the diol compound having a polyoxyalkylene group are cyanoalkylated, and the resulting terminal cyanoalkyl group is reduced and aminoalkylated.

[0056] 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. Preferred examples of the aliphatic glycol, dihydric phenol, and aliphatic dicarboxylic acid include ethylene glycol, diethylene glycol, propylene glycol, butanediol, hydroquinone, bisphenol A, bisphenol S, and adipic acid.

[0057] In this embodiment, the amide block having two or more carboxyl groups per molecule includes 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 per molecule is preferably one or more dicarboxylic acid derivatives selected from the group consisting of polyamides and polyamideimides, which have carboxyl groups at both ends. The dicarboxylic acid derivative can be prepared by ring-opening polymerization of an amide bond-forming monomer or polycondensation of an amide bond-forming monomer and the dicarboxylic acid compound using a dicarboxylic acid compound as a regulator. 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, undecanediic acid, dodecanediic acid, tridecanediic acid, tetradecanediic acid, hexadecanedioic acid, octadecanedioic acid, and icosanediic acid; 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 include alicyclic dicarboxylic acids such as 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. The amide bond-forming monomer may be a lactam compound, an aminocarboxylic acid compound, or 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. 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. Examples of the diamine compound include ethylenediamine, hexamethylenediamine, heptamethylenediamine, octamethylenediamine, decamethylenediamine, eicosanediamine, xylenediamine, and cyclohexyldiamine. 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 per molecule, and the above-mentioned ester block having two or more carboxyl groups per molecule.

[0058] The ester block having two or more carboxyl groups per molecule of this embodiment may be a diol compound having an ester group. The diol compound having an ester group may have a structure obtained by polycondensing or transesterifying an ester block-forming monomer described below using the dicarboxylic acid compound as a regulator by a known method. Examples of the ester block-forming monomer include a combination of one or more compounds selected from the dicarboxylic acid compounds and dicarboxylic acid ester compounds and one or more compounds selected from the alcohol compounds and phenol compounds; the lactone compounds; hydroxycarboxylic acid compounds; and mixtures thereof. The dicarboxylic acid ester 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 dimethyl 3-sulfoisophthalate, and sodium diethyl 3-sulfoisophthalate. 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. 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.

[0059] The "water absorption" in this specification is a value obtained by the following method in accordance with ASTM-D570. The "water absorption" 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, immersing the test piece in ion-exchanged water at 23°C for 24 hours, wiping off any water on the test piece with a cloth, and then measuring the mass (W2) of the test piece, and then calculating the water absorption from the following formula: Water absorption rate (%)=[(W2)-(W1)]×100 / (W1) The above test specimens are prepared using a normal injection molding machine [PS40E5ASE, manufactured by Nissei Plastic Industrial Co., Ltd.] at a predetermined cylinder temperature of 180°C and mold temperature of 50°C. The water absorption rate of the antistatic agent (a1) of this embodiment is preferably 10 to 150% by mass, more preferably 20 to 100% by mass, and even more preferably 30 to 90% by mass.

[0060] In this embodiment, the number average molecular weight (Mn) of the amide block is preferably 300 to 15,000. The number average molecular weight (Mn) of the polyether block is preferably 100 to 6,000. The number average molecular weight (Mn) of the ester block is preferably 150 to 15,000.

[0061] 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). 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). The content of the ester block in the block copolymer (A1) in this embodiment is 1% by mass to 50% by mass relative to the total amount of the block copolymer (A1).

[0062] "Method for producing block copolymer (A1)" The block copolymer (A1) of this embodiment can be produced by a known method, for example, the following method. An amide compound having a terminal carboxyl group is prepared by reacting a carboxylic acid compound containing two or more carboxylic acid groups with a monomer that forms an amide bond, and optionally a monomer that forms an ester bond. 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) under reduced pressure (1 mmHg or less) to synthesize a polyetheramide block copolymer (A1). The antistatic agent of this embodiment can be produced by kneading the block copolymer (A1) and, if necessary, an ionic liquid or an ionic surfactant, for example. Among the polymerization reactions in the above production method, an esterification catalyst is usually used in the polyesterification reaction. Examples of the esterification catalyst include protonic acids (phosphoric acid, etc.), organic acid salts (acetic acid, etc.) 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.)], carbonates, sulfates, phosphates, oxides, chlorides, hydroxides, and alkoxides.

[0063] The surface resistivity (Ω / sq.) of the antistatic layer or the antistatic resin composition of this embodiment is 1×10 8 ~1×10 12 (Ω / sq.), and more preferably 1×10 9 ~1×10 11 (Ω / sq.). The surface resistivity (Ω / sq.) of the antistatic layer or antistatic resin composition of the present embodiment was measured by preparing a test piece and measuring it according to the method described in the Examples section.

[0064] The refractive index (27° C.) of the antistatic layer or antistatic resin composition of this embodiment is preferably greater than 1.510, more preferably greater than 1.510 and 1.580 or less, and even more preferably 1.520 or more and 1.570 or less. When the refractive index of the antistatic layer or antistatic resin composition of this embodiment is 1.510 or less, the antistatic agent (a1) tends to be uniformly dispersed in the component (B2) in the antistatic layer or antistatic resin composition. In particular, in an antistatic layer prepared by mixing a predetermined amount of a polyetheramide block copolymer (A1-1) or a polyetheresteramide block copolymer (A1-2) as the antistatic agent (a1) with a terpolymer having a styrene-based monomer unit (b2-1), a (meth)acrylic acid ester monomer unit (b2-2), and a (meth)acrylic acid monomer unit (b2-3) as the styrene-unsaturated carboxylic acid resin (B2), the terpolymer and the antistatic agent (a1) were confirmed to form a compatible phase. As a result, since the two are compatible with each other, the antistatic layer as a whole can maintain extremely high transparency even when the refractive index difference between them is large. On the other hand, when a mixture of a binary copolymer of styrene-based monomer units (b2-1) and (meth)acrylic acid ester monomer units (b2-2) and a binary copolymer of styrene-based monomer units (b2-1) and (meth)acrylic acid monomer units (b2-3) was used as component (B2) in combination with a polyetheramide block copolymer (A1-1) or a polyetheresteramide block copolymer (A1-2) instead of a terpolymer having styrene-based monomer units (b2-1), (meth)acrylic acid ester monomer units (b2-2), and (meth)acrylic acid monomer units (b2-3), component (B2) contained the same monomer units as the terpolymer, but did not achieve a high level of compatibility with each other even when mixed with polyetheramide block copolymer (A1-1) or polyetheresteramide block copolymer (A1-2) as antistatic agent (a1). As a result, the system (=antistatic layer) in which two types of binary copolymers and the antistatic agent (a1) were mixed resulted in inferior transparency of the antistatic transparent resin composition and the antistatic layer as a whole, compared to the system (=particularly preferred antistatic layer of this embodiment) in which the ternary copolymer and the antistatic component (A) were mixed. The refractive index of the antistatic resin composition of this embodiment was measured by preparing a test piece and measuring it according to the method described in the Examples section.

[0065] In the laminate sheet of this embodiment, the refractive index (23°C) of the impact resistant polystyrene (B1), the styrene-unsaturated carboxylic acid resin (B2), and the antistatic agent (a1) is n B1 , n B2 , n A Then, n A <n B1 <n B2 It is preferable that the following relationship holds: As described above, in an antistatic layer prepared by mixing predetermined amounts of the polyetheramide block copolymer (A1-1) or polyetheresteramide block copolymer (A1-2) as the antistatic agent (a1) and the styrene-unsaturated carboxylic acid resin (B2) as the terpolymer having styrene-based monomer units (b2-1), (meth)acrylic acid ester monomer units (b2-2), and (meth)acrylic acid monomer units (b2-3), it was confirmed that the terpolymer and the antistatic agent (a1) form a mutually compatible phase. Therefore, since the styrene-unsaturated carboxylic acid resin (B2) and the antistatic agent (a1) are mutually compatible, the difference in refractive index between them (n B2 and n A It was confirmed that the antistatic layer as a whole can maintain extremely high transparency even when the absolute value of the difference between the surface resistivity and the surface resistivity is large. Therefore, it is possible to achieve both high transparency and excellent surface resistivity at an even higher level.

[0066] <Ionic liquid> The antistatic layer or antistatic resin composition of this 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. 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)); and 1-ethyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl). Examples of suitable ionic liquids include 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. In the antistatic layer or antistatic resin composition of this embodiment, the content of the ionic liquid is preferably 0% by mass or more and 2% by mass or less, and more preferably 0% by mass or more and 1% by mass or less, relative to 100% by mass of the total amount of the antistatic layer or antistatic resin composition.

[0067] <Ionic surfactants> The antistatic layer or the antistatic resin composition of the present embodiment may contain an ionic surfactant. The ionic surfactant is not particularly limited, and examples thereof include cationic surfactants and anionic surfactants. 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, hydrofluoroborates, ethosulfates, 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. In the antistatic layer or antistatic resin composition of the present embodiment, the content of the ionic surfactant is preferably 0% by mass or more and 2% by mass or less, and more preferably 0% by mass or more and 1% by mass or less, relative to 100% by mass of the total amount of the antistatic layer or antistatic resin composition.

[0068] "Styrene-unsaturated carboxylic acid resin (B2): component (B2)" The component (B2) of this embodiment is a styrene-unsaturated carboxylic acid resin (B2) containing a styrene-based monomer unit (b2-1) and a (meth)acrylic acid-based monomer unit (b2), which improves the compatibility between the antistatic agent (a1) having an amide bond and the component (B1), thereby contributing to improved transparency. Furthermore, the component (B2) may, if necessary, further contain other monomer units in addition to the styrene-based monomer unit (b2-1) and the (meth)acrylic acid-based monomer unit (b2).

[0069] The refractive index (27°C) of the styrene-unsaturated carboxylic acid resin (B2), which is the component (B2) of this embodiment, is preferably greater than 1.560, more preferably greater than 1.560 and not greater than 1.585, and even more preferably 1.563 or greater and not greater than 1.580.

[0070] In a preferred embodiment of the component (B2) of this embodiment, the content of the styrene-based monomer units (b2-1) in the entire styrene-unsaturated carboxylic acid resin (B2) is, for example, preferably 30 to 98 mass%, more preferably 40 to 96 mass%, even more preferably 50 to 94 mass%, still more preferably 60 to 92 mass%, and even more preferably 70 to 90 mass%.

[0071] In a preferred embodiment of the component (B2) of this embodiment, the content of the (meth)acrylic acid monomer units (b2) in the entire styrene-unsaturated carboxylic acid resin (B2) is, for example, preferably 2 to 70 mass%, more preferably 4 to 60 mass%, even more preferably 6 to 50 mass%, still more preferably 8 to 40 mass%, and even more preferably 10 to 30 mass%.

[0072] The (meth)acrylic acid-based monomer unit (b2) of this embodiment preferably contains one or more monomer units selected from the group consisting of (meth)acrylic acid ester monomer units (b2-2) and (meth)acrylic acid monomer units (b2-3).

[0073] In a preferred embodiment of the component (B2) of this embodiment, the content of the (meth)acrylic acid ester monomer units (b2-2) in the entire styrene-unsaturated carboxylic acid resin (B2) is, for example, preferably 0.6 to 50 mass%, more preferably 1 to 20 mass%, even more preferably 2 to 16 mass%, still more preferably 3 to 12 mass%, and even more preferably 4 to 10 mass%.

[0074] In a preferred embodiment of the component (B2) of this embodiment, the content of the (meth)acrylic acid monomer units (b2-3) in the entire styrene-unsaturated carboxylic acid resin (B2) is, for example, preferably 0.7 to 25 mass%, more preferably 1 to 20 mass%, even more preferably 2 to 18 mass%, still more preferably 3 to 16 mass%, and even more preferably 4 to 13 mass%. A content of 0.7% by mass or more can improve heat resistance, and a content of 25% by mass or less can prevent excessive viscosity increase. In particular, a content in the range of 4 to 13% by mass can provide a resin that achieves both a high improvement in heat resistance and suppresses gel formation to a level suitable for transparent sheet applications.

[0075] <Styrene-based monomer unit (b2-1) and (meth)acrylic acid ester monomer unit (b2-2)> Preferred embodiments and examples of the styrene-based monomer unit (b2-1) and the (meth)acrylic acid ester monomer unit (b2-2) constituting the styrene-unsaturated carboxylic acid resin (B2) of this embodiment are the same as those of the styrene-based monomer unit (b2-1) and the (meth)acrylic acid ester monomer unit (b2-2) of the impact-resistant polystyrene (B1) described above.

[0076] <(Meth)acrylic acid monomer unit (b2-3)> In this embodiment, examples of the (meth)acrylic acid monomer unit (b2-3) include methacrylic acid, acrylic acid, maleic anhydride, maleic acid, fumaric acid, and itaconic acid, and methacrylic acid or acrylic acid is preferred.

[0077] <Characteristics of styrene-unsaturated carboxylic acid resin (B2)> The contents of the styrene-based monomer unit (b2-1), the (meth)acrylic acid monomer unit (b2-2), and the (meth)acrylic acid ester monomer unit (b2-3) in the styrene-unsaturated carboxylic acid resin (B2) in this embodiment can be quantified using pyrolysis GC / MS based on a calibration curve prepared using a resin in which the contents of each monomer unit are known. The melt flow rate of the styrene-unsaturated carboxylic acid resin (B2) in this embodiment at 200°C is preferably 0.3 to 3.0, more preferably 0.4 to 2.5, and even more preferably 0.4 to 2.0. A melt flow rate of 0.3 or more is preferred from the viewpoint of fluidity, and a melt flow rate of 3.0 or less is preferred from the viewpoint of the mechanical strength of the resin. In the present disclosure, the melt flow rate is a value measured in accordance with ISO 1133 at 200°C under a load of 49 N.

[0078] The weight-average molecular weight (Mw) of the styrene-unsaturated carboxylic acid resin (B2) in this embodiment is preferably 100,000 to 280,000, more preferably 120,000 to 250,000. When the weight-average molecular weight is 100,000 to 280,000, a resin having a practically excellent balance between impact strength and fluidity can be obtained. The weight-average molecular weight can be measured by gel permeation chromatography using polystyrene as the standard.

[0079] A suitable styrene-unsaturated carboxylic acid resin (B2) of this embodiment is preferably a copolymer having a styrene-based monomer unit (b2-1) and a (meth)acrylic acid ester monomer unit (b2-3), more preferably a copolymer containing a styrene-based monomer unit (b2-1) and a (meth)acrylic acid monomer unit (b2-2), and particularly preferably a copolymer having a styrene-based monomer unit (b2-1), a (meth)acrylic acid monomer unit (b2-2), and a (meth)acrylic acid ester monomer unit (b2-3).

[0080] <Method for producing styrene-unsaturated carboxylic acid resin (B2)> The method for producing the styrene-unsaturated carboxylic acid resin (B2) of this embodiment will be described below. The method for producing the styrene-unsaturated carboxylic acid resin (B2) of this embodiment preferably includes the steps of: mixing a styrene monomer (b2-1), a (meth)acrylic acid monomer (b2) (for example, one or more selected from the group consisting of a (meth)acrylic acid monomer (b2-3) and a (meth)acrylic acid ester monomer (b2-2)), and a solvent to prepare a mixed solution; polymerizing the mixed solution to produce a reaction product; and recovering the reaction product. The polymerization method for the styrene-unsaturated carboxylic acid resin (B2) is not particularly limited, but for example, a radical polymerization method, among which a bulk polymerization method or a solution polymerization method can be preferably used. Specifically, the polymerization method mainly comprises a polymerization step of polymerizing polymerization raw materials (monomer components) and a devolatilization step of removing volatile components such as unreacted monomers and polymerization solvents from the polymerization product.

[0081] In this embodiment, when the polymerization raw materials are polymerized to obtain the styrene-unsaturated carboxylic acid resin (B2), a polymerization initiator is typically contained in the polymerization raw material composition. Examples of the polymerization initiator include organic peroxides, such as peroxyketals such as 2,2-bis(t-butylperoxy)butane, 1,1-bis(t-butylperoxy)cyclohexane, and n-butyl-4,4-bis(t-butylperoxy)valerate, dialkyl peroxides such as di-t-butyl peroxide, t-butylcumyl peroxide, and dicumyl peroxide, diacyl peroxides such as acetyl peroxide and isobutyryl peroxide, peroxydicarbonates such as diisopropyl peroxydicarbonate, peroxyesters such as t-butyl peroxyacetate, ketone peroxides such as acetylacetone peroxide, and hydroperoxides such as t-butyl hydroperoxide. Among these, 1,1-bis(t-butylperoxy)cyclohexane is preferred from the viewpoint of decomposition rate and polymerization rate.

[0082] In this embodiment, a chain transfer agent may be used as needed during polymerization of the styrene-unsaturated carboxylic acid resin (B2). Examples of the chain transfer agent include α-methylstyrene linear dimer, n-dodecyl mercaptan, t-dodecyl mercaptan, and n-octyl mercaptan.

[0083] The polymerization method for the styrene-unsaturated carboxylic acid resin (B2) can be solution polymerization using a polymerization solvent. The polymerization solvent is preferably an aromatic solvent such as toluene, ethylbenzene, propylbenzene, or butylbenzene, and if necessary, a solvent system in which the solubility of the styrene-unsaturated carboxylic acid resin (B2) is adjusted by combining a polar solvent such as an alcohol or a ketone may be used. In this embodiment, the polymerization solvent is preferably used in the range of 3 to 35 parts by mass, more preferably 5 to 30 parts by mass, per 100 parts by mass of all monomers constituting the styrene-unsaturated carboxylic acid resin (B2). If the amount of polymerization solvent exceeds 35 parts by mass per 100 parts by mass of all monomers, the polymerization rate decreases and the molecular weight of the resulting resin also decreases, which tends to reduce the mechanical strength of the resin. Furthermore, if the amount of polymerization solvent is less than 3 parts by mass, it may become difficult to control heat removal during polymerization. Adding the polymerization solvent in an amount of 3 to 35 parts by mass per 100 parts by mass of all monomers is preferred in terms of facilitating uniform quality and controlling the polymerization temperature. Furthermore, when a monohydric alcohol having 10 or more carbon atoms, which is an optional component of the styrene-based resin composition of this embodiment, is added from the polymerization system, it is preferable to add the monohydric alcohol in a proportion of 1 to 10 mass % relative to 100 mass % of the total polymerization solvent.

[0084] The apparatus used in the polymerization step to obtain the styrene-unsaturated carboxylic acid resin (B2) in this embodiment is not particularly limited and may be appropriately selected according to a typical styrene resin polymerization method. For example, in the case of bulk polymerization, a polymerization apparatus having one or more complete mixing reactors connected together can be used. The devolatilization step is also not particularly limited. In the case of bulk polymerization, polymerization is continued until the final unreacted monomer content is preferably 50% by mass or less, more preferably 40% by mass or less, and devolatilization treatment is performed by a known method to remove volatile components such as the unreacted monomer. For example, conventional devolatilization apparatuses such as flash drums, twin-screw devolatilizers, thin-film evaporators, and extruders can be used, but devolatilization apparatuses with small retention areas are preferred. The devolatilization temperature is typically about 190 to 280°C, and more preferably 190 to 260°C from the viewpoint of suppressing decomposition. The devolatilization pressure is typically about 0.13 to 4.0 kPa, preferably 0.13 to 3.0 kPa, and more preferably 0.13 to 2.0 kPa. Desirable methods for devolatilization include, for example, a method of removing volatile components under reduced pressure while heating, and a method of removing volatile components through an extruder or the like designed for the purpose of removing volatile components.

[0085] "Additives" In the present embodiment, the laminate sheet, the antistatic resin composition and / or the substrate resin composition may contain additives as necessary. In the present embodiment, various additives, such as ultraviolet absorbers, light stabilizers, lubricants, antioxidants, flame retardants, plasticizers, higher fatty acid compounds, various dyes and pigments, inorganic crystal nucleating agents (metal oxides such as titanium oxide and tin oxide), organic crystal nucleating agents, fluorescent brighteners, light diffusing agents, and selective wavelength absorbers, may be added as needed at any stage before or after the recovery step when producing each component of the antistatic agent resin composition and / or the resin composition for substrates, or at the stage of extruding or molding the antistatic agent resin composition and / or the resin composition for substrates, within a range that does not impair the object of the present invention. The amount of the additives in the styrene-based resin composition is preferably 0% by mass or more and 10% by mass or less, more preferably more than 0% by mass or more and 6% by mass or less, even more preferably 0.1% by mass or more and 3.5% by mass or less, and even more preferably 0.2% by mass or more and 0.9% by mass or less, relative to 100% by mass of the styrene-based resin composition.

[0086] (Higher fatty acid compound) In this embodiment, the laminate sheet, the antistatic resin composition, and / or the substrate resin composition contain a higher fatty acid compound as needed, which suppresses or prevents thinning during molding and exhibits excellent effects on deep drawability during molding. Examples of the higher fatty acid compounds include higher fatty acids, esters of higher fatty acids and higher alcohols (e.g., myristyl myristate, stearyl stearate, octyldodecyl behenate, behenyl behenate), esters of higher fatty acids and sorbitan (sorbitan monopalmitate, sorbitan monostearate, sorbitan tristearate, sorbitan distearate, sorbitan monobehenate), esters of higher fatty acids and glycerin (glycerin monostearate, glycerin distearate, glycerin tristearate, glyceryl myristate, glyceryl palmitate, glyceryl behenate, glyceryl oleate), stearic acid, capric acid, lauric acid, myristic acid, palmitic acid, isostearic acid, and hydrogenated oils (extremely hydrogenated beef tallow oil, hydrogenated castor oil). The higher fatty acid compounds may be used alone or in combination of two or more. In the laminate sheet, antistatic resin composition, and / or substrate resin composition of this embodiment, the content of the higher fatty acid compound is preferably 0 to 0.7 mass%, more preferably 0.03 to 0.7 mass%, even more preferably 0.05 to 0.65 mass%, even more preferably 0.07 to 0.6 mass%, and even more preferably 0.1 to 0.55 mass%, relative to the total amount (100 mass%) of the laminate sheet, antistatic resin composition, and / or substrate resin composition. If the content of the higher fatty acid compound, such as stearic acid, exceeds 7,000 ppm (1%), volatile gases are generated, tending to increase the frequency of machine maintenance.

[0087] (plasticizer) The laminate sheet, antistatic resin composition, and / or substrate resin composition of this embodiment may contain a known plasticizer other than a higher fatty acid compound, if necessary. Specific examples of the plasticizer include liquid paraffin and aliphatic or cyclic hydrocarbons (e.g., nonane, decane, decalin, p-xylene, undecane, or dodecane) from the viewpoint of thermal stability. Of these, liquid paraffin is more preferred as the plasticizer of this embodiment. In this embodiment, the content of the plasticizer is preferably 0.05% by mass or more and 5% by mass or less, more preferably 0.1% by mass or more and 2.8% by mass or less, even more preferably 0.15% by mass or more and 2% by mass or less, and even more preferably 0.2% by mass or more and 1.8% by mass or less, relative to 100% by mass of the total amount of the laminate sheet, the antistatic resin composition, and / or the substrate resin composition.

[0088] The liquid paraffin, also known as mineral oil, is an oligomer and polymer containing paraffinic hydrocarbons. The liquid paraffin includes paraffinic oil, naphthenic oil, and paraffin wax, and is a mixture of paraffinic hydrocarbons and alkylnaphthenic hydrocarbons. It includes both those with a specific gravity of 0.8494 or less at 15°C and those with a specific gravity of more than 0.8494 at 15°C. Furthermore, the naphthene content of the liquid paraffin is preferably 15% to 55% by mass, more preferably 20% to 45% by mass, and even more preferably 19% to 35% by mass, based on 100% by mass of the liquid paraffin. In this embodiment, the kinematic viscosity (40°C) of the liquid paraffin can be appropriately set depending on the purpose of use, but is preferably 3 to 500 mm 2 / s is preferably 5 to 400 mm 2 / s is more preferable, and 6 to 300 mm 2 / s is more preferable, and 7 to 150 mm 2 It is particularly preferred that the ratio is / s. The kinematic viscosity of the liquid paraffin was measured in accordance with JIS K2283, specifically, using an automatic viscosity measuring device (VMC-252 model) (manufactured by Rigo Co., Ltd.) with an Ubbelohde viscometer (viscometer number 2) at a measurement temperature of 40°C. For example, representative liquid paraffins are not particularly limited, but suitable examples include Krystal (registered trademark) N352 and Primol (registered trademark) N382 manufactured by ExxonMobil Corporation; PL-380 manufactured by Sonneborn; Diana Process Oil (registered trademark) PW-380, PW-150, PW-100, PW-90, and Daphne Oil (registered trademark) CP68N and CP50S manufactured by Idemitsu Kosan Co., Ltd.; Liquid Paraffin 350-S, PS-350S, and LP530-SP manufactured by Sanko Chemical Industry Co., Ltd.; F380N manufactured by Formosa; PARACOS KF-550 and PARACOS KF-350 manufactured by Seojin Chemical Corporation; and Edelex 226 manufactured by Shell Chemicals Japan.

[0089] (antioxidant) The laminate sheet, antistatic resin composition, and / or substrate resin composition of this embodiment may contain an antioxidant. In the laminate sheet, antistatic resin composition, and / or substrate resin composition of this embodiment, the content of the antioxidant is preferably 0.001 to 0.5 mass%, more preferably 0.01 to 0.45 mass%, even more preferably 0.03 to 0.4 mass%, and even more preferably 0.05 to 0.35 mass%, relative to 100 mass% of the total amount of the styrene-based resin composition. Examples of the antioxidant include phenolic compounds, phosphorus compounds, and thioether compounds. Examples of the phenolic antioxidant include 2,6-di-tert-butyl-p-cresol, 2,6-diphenyl-4-octadecyloxyphenol, distearyl(3,5-di-tert-butyl-4-hydroxybenzyl)phosphonate, 1,6-hexamethylenebis[(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid amide], 4,4'-thiobis(6-tert-butyl-m-cresol), 2,2'-methylenebis(4-methyl-6-tert-butylphenol), 2,2'-methylene Bis(4-ethyl-6-tert-butylphenol), 4,4'-butylidenebis(6-tert-butyl-m-cresol), 2,2'-ethylidenebis(4,6-di-tert-butylphenol), 2,2'-ethylidenebis(4-sec-butyl-6-tert-butylphenol), 1,1,3-tris(2-methyl-4-hydroxy-5-tert-butylphenyl)butane, 1,3,5-tris(2,6-dimethyl-3-hydroxy-4-tert-butylbenzyl)isocyanurate, 1,3,5-tris(3 ,5-di-tert-butyl-4-hydroxybenzyl) isocyanurate, 1,3,5-tris(3,5-di-tert-butyl-4-hydroxybenzyl)-2,4,6-trimethylbenzene, 2-tert-butyl-4-methyl-6-(2-acryloyloxy-3-tert-butyl-5-methylbenzyl)phenol, stearyl [3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], tetrakis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate methyl ester ] methane, thiodiethylene glycol bis[(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 1,6-hexamethylene bis[(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], bis[3,3-bis(4-hydroxy-3-tert-butylphenyl)butylic acid] glycol ester, bis[2-tert-butyl-4-methyl-6-(2-hydroxy-3-tert-butyl-5-methylbenzyl)phenyl] terephthalate, 1,3,5-tris[(3,Examples of suitable bis(3-tert-butyl-4-hydroxyphenyl)propionyloxyethyl)isocyanurate include 3,9-bis[1,1-dimethyl-2-{(3-tert-butyl-4-hydroxy-5-methylphenyl)propionyloxy}ethyl]-2,4,8,10-tetraoxaspiro[5,5]undecane, and triethylene glycol bis[(3-tert-butyl-4-hydroxy-5-methylphenyl)propionate]. These may be used alone or in combination of two or more.

[0090] Examples of the phosphorus-based antioxidant include tris(2,4-di-tert-butylphenyl)phosphite, trisnonylphenyl phosphite, tris[2-tert-butyl-4-(3-tert-butyl-4-hydroxy-5-methylphenylthio)-5-methylphenyl]phosphite, tridecyl phosphite, octyldiphenyl phosphite, di(decyl)monophenyl phosphite, di(tridecyl)pentaerythritol diphosphite, and di(nonylphenyl)pentaerythritol. Diphosphite, bis(2,4-tert-butylphenyl)pentaerythritol diphosphite, bis(2,6-di-tert-butyl-4-methylphenyl)pentaerythritol diphosphite, bis(2,4,6-tri-tert-butylphenyl)pentaerythritol diphosphite, bis(2,4-dicumylphenyl)pentaerythritol diphosphite, tetra(tridecyl)isopropylidenediphenol diphosphite, tetra(tridecyl)-4,4'-n-butyl methylidenebis(2-tert-butyl-5-methylphenol) diphosphite, hexa(tridecyl)-1,1,3-tris(2-methyl-4-hydroxy-5-tert-butylphenyl)butane triphosphite, tetrakis(2,4-di-tert-butylphenyl)biphenylene diphosphonite, 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, 2,2'-methylenebis(4,6-di-tert-butylphenyl)-2-ethylhexyl phosphite phosphate, 2,2'-methylenebis(4,6-di-tert-butylphenyl)-octadecyl phosphite, 2,2'-ethylidenebis(4,6-di-tert-butylphenyl)fluorophosphite, tris(2-[(2,4,8,10-tetrakis-tert-butyldibenzo[d,f][1,3,2]dioxaphosphepin-6-yl)oxy]ethyl)amine, phosphite of 2-ethyl-2-butylpropylene glycol and 2,4,6-tri-tert-butylphenol, etc. These may be used alone or in combination of two or more.

[0091] Examples of the thioether antioxidant include dialkyl thiodipropionates such as dilauryl thiodipropionate, dimyristyl thiodipropionate, and distearyl thiodipropionate, and pentaerythritol tetra(β-alkylmercapto)propionates, which may be used alone or in combination of two or more.

[0092] "Method of manufacturing laminated sheets" The laminated sheet of this embodiment can be produced by a conventionally known method, for example, a method in which each layer is formed separately in advance and then laminated or thermocompressed, a method in which another layer is formed by covering the top or bottom surface of a preformed layer, or a method in which each resin layer is co-extruded and laminated. The laminate sheet of this embodiment is preferably formed by lamination through coextrusion molding. Examples of the coextrusion molding method include a T-die extrusion method, a T-die extrusion simultaneous lamination method, and a T-die extrusion tandem lamination method. Specifically, for example, when the above-mentioned substrate resin composition and antistatic agent resin composition are co-extrusion molded, the above-mentioned substrate resin composition and antistatic agent resin composition are melted, kneaded, and dispersed in separate extruders (for example, a single-screw extruder, a twin-screw extruder, etc.), and then a multilayer sheet is formed using a dedicated T-die to obtain a laminate sheet consisting of two layers, in which a substrate layer made of the above-mentioned substrate resin composition and an antistatic layer made of the antistatic agent resin composition cover both surfaces of the substrate layer.

[0093] As a condition for extrusion molding using a T-die, from the viewpoint of the meltability of the resin and outgassing, the extrusion temperature is preferably set to 200°C or higher and 240°C or lower. The extrusion temperature can also be set to the melting point of the resin with the highest melting point + 10°C or higher. This makes it possible to prevent the resin from being extruded in an unmolten state.

[0094] In the laminate sheet of this embodiment, the substrate preferably contains a higher fatty acid compound in an amount of 0.3% by mass or more and 0.8% by mass or less relative to the total amount of the substrate. It has been confirmed that within this range, fuzzing is less likely to occur during cutting. That is, if fluff occurs when cutting a laminated sheet, not only will the appearance deteriorate when the laminated sheet is formed into, for example, a carrier tape, but the fluff that detaches from the carrier tape may adhere to electronic components as impurities, thereby contaminating or damaging the components. Therefore, it is required that such fluff not be generated when the laminated sheet is formed into a carrier tape.

[0095] "Carrier tape and packaging materials" One aspect of a molded article using the laminate sheet of this embodiment is a carrier tape composed of a sheet body 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 sheet body being a carrier tape molded from the laminate sheet of this embodiment. The carrier tape can be a carrier tape for transporting electronic components. An example of the carrier tape and packaging material for transporting electronic components according to this embodiment will be described below with reference to Figs. 1 and 2. Fig. 1 is a perspective view showing how electronic components are stored using the carrier tape. The carrier tape is composed of a carrier tape body 21 obtained by embossing the laminated sheet according to this embodiment. Furthermore, as shown in Fig. 4 described later, the packaging material for transporting electronic components is composed of the carrier tape body 21 and a cover tape 27. In FIG. 1, a carrier tape body 21 is a long sheet body having a plurality of recesses 22 formed at predetermined intervals, each recess 22 being capable of accommodating electronic components 25. The recesses 22 are formed at predetermined intervals, and an edge 23 is formed around the periphery of the recesses 22 as an excess portion that can be adhered to a cover tape (not shown in FIG. 1), which is a covering that seals the recesses 22. As shown in FIG. 1, electronic components 25 are housed inside the recesses 22 arranged at predetermined intervals. Also, in FIG. 1, a preferred embodiment of the carrier tape body 21 has through holes 24 formed in the edge 23 at predetermined intervals. More specifically, a plurality of through holes 24 are formed at predetermined intervals in the edge 23 such that one through hole 24 corresponds to one recess 22. The through holes 24 function as sprockets, and are therefore also called sprocket holes, and are used to transport the carrier tape. Next, FIG. 2 is a perspective view showing the process of storing and sealing electronic components using packaging material for transporting electronic components. As shown in FIG. 2, manufactured electronic components 25 are stored in recesses 22 of a carrier tape body 21, covered with a cover tape 27, and the cover tape 27 is heat-sealed along the edge 23 to form a rail-like seal 26. The cover tape 27 is then fixed to the carrier tape body 21, sealing the recesses 22. The packaging material containing the packaged electronic components 25 is then wound onto a reel and stored and transported in roll form. Also, as shown in FIG. 2, a preferred form of the carrier tape body 21 has through holes 24. More specifically, a plurality of through holes 24 are provided at predetermined intervals in the edge 23 so that one through hole 24 corresponds to one recess 22. Because the through holes 24 function as sprockets, they are also called sprocket holes and are used to transport the carrier tape. When mounting the electronic component 25 packaged with the cover tape 27 and the carrier tape main body 21 on a substrate as described above, the packaging material containing the rolled-up electronic component 25 is pulled out, and in the reverse order of the above-described storing and sealing process, the cover tape 27 is peeled off from the carrier tape main body 21, and the electronic component 25 is removed and ready for mounting.

[0096] Generally, transparent plastic sheets are used for the carrier tape main body 21 and the cover tape 27 so that the electronic components 25 inside can be seen after packaging. The carrier tape main body 21 is made by cutting a sheet (a so-called resin sheet) into a tape shape and forming recesses 22 by embossing. Therefore, the resin sheet used to form the carrier tape main body 21 is required to have good formability that prevents holes from being created during embossing or that makes it difficult to thin the sheet, and mechanical strength to protect the electronic components 27 after packaging. However, electronic components are becoming larger as they are integrated (modularized) while also becoming smaller in size, which has led to an increased demand for deep-draw formability in carrier tapes. Therefore, the present disclosure provides a carrier tape for transporting electronic components that can accommodate large components by using the laminated sheet of this embodiment for the carrier tape body 21, thereby suppressing and preventing thinning during molding and exhibiting excellent deep-draw formability during molding.

[0097] Although the embodiments of the present invention have been described above, the present invention is not limited to the above examples and can be modified as appropriate. [Example]

[0098] The present invention will now be described in more detail with reference to examples and comparative examples, but the present invention is not limited to these examples. The resins and extruded sheets used in the examples and comparative examples were analyzed and evaluated as follows.

[0099] [Evaluation of properties of each resin and resin composition] (1) Measurement of weight-average molecular weight The weight average molecular weight (Mw) of each resin and resin composition produced in the examples and comparative examples was measured using gel permeation chromatography (GPC) under the following conditions. Measuring equipment: Tosoh HLC-8220 Separation column: Two TSK gel Super HZM-H (inner diameter 4.6 mm) manufactured by Tosoh Corporation connected in series Guard column: Tosoh TSK guard column Super HZ-H Measurement solvent: tetrahydrofuran (THF) Sample concentration: 5 mg of the measurement sample was dissolved in 10 mL of solvent and filtered through a 0.45 μm filter. Injection volume: 10μL Measurement temperature: 40℃ Flow rate: 0.35mL / min Detector: differential refractometer The calibration curve was created using 11 types of TSK standard polystyrene (F-850, F-450, F-128, F-80, F-40, F-20, F-10, F-4, F-2, F-1, A-5000) manufactured by Tosoh Corporation. The calibration curve was created using a linear approximation equation.

[0100] (2) Melt mass flow rate (MFR) measurement The melt mass flow rate (g / 10 min) of each of the resins and resin compositions produced in the Examples and Comparative Examples was measured in accordance with ISO1133 under conditions of 200°C and a load of 49N.

[0101] (3) Measurement of the content of rubber-like polymer particles (C1) The content (mass%) of rubber-like polymer particles (C1) in the antistatic transparent grease composition was measured by weighing 1 g of the rubber-modified antistatic transparent grease composition (referred to as W) into a settling tube, adding 20 mL of a 9:1 mixed solution of methyl ethyl ketone / methanol, and shaking at 23 ° C for 2 hours. The mixture was then centrifuged at 5 ° C or below and 20,000 rpm (centrifugal acceleration: 4510 G) for 60 minutes in a centrifuge (Sakuma Seisakusho, SS-2050A). The settling tube was slowly tilted at approximately 45 degrees, and the supernatant was decanted. The resulting insoluble matter was subsequently vacuum-dried at 160 ° C and 3 kPa or less for 1 hour. After cooling to room temperature in a desiccator, the mass of the methyl ethyl ketone / methanol insoluble matter was weighed (referred to as G). The content (mass%) of rubber-like polymer particles (C1) was calculated using the following formula: Content of rubber-like polymer particles (C1) = (G / W) x 100

[0102] (4) Refractive index measurement Plates were prepared for each of the antistatic agent (a1), the components (B1) and (B2), and measurements were made at 25° C. using an Abbe refractometer to calculate the refractive index and the difference therebetween.

[0103] (5) Measurement of total light transmittance and haze The total light transmittance (%) of the 500 μm thick laminate sheets obtained in the Examples and Comparative Examples was measured in accordance with JIS K 7361-1, and the haze (%) was measured in accordance with JIS K 7136 to evaluate transparency. If the haze (%) is 15% or more, visibility is significantly reduced, and if it is 10% or less, the contents are clearly visible. Therefore, the haze (%) was evaluated according to the following criteria. Haze (%) is 10% or less. Haze (%) is over 10% to less than 15% △ Haze (%) is 15% or more × In addition, since transparency varies depending on the thickness of the laminate sheet and the thickness ratio between the surface layer and the base layer, it was confirmed that the haze value of the laminate sheet in Example 1 was 3.56 when a 0.3 mm sheet was used as the laminate sheet (surface layer-base material-surface layer configuration) and the thickness ratio of each layer in the (surface layer-base material-surface layer configuration) was 5 / 90 / 5.

[0104] The haze change rate (%) of the laminated sheet containing the recycled material in Example 2 was calculated by the following formula. Haze change rate (%)={Haze value of laminated sheet containing recycled material of (Example 2)−Haze value of laminated sheet of (Example 1)} / {Haze value of laminated sheet of (Example 1)}×100 Similarly, the haze change rate (%) of the laminated sheet containing the recycled material in Example 12 was calculated by the following formula. Haze change rate (%)={Haze value of laminated sheet containing recycled material of (Example 12)−Haze value of laminated sheet of (Example 5)} / {Haze value of laminated sheet of (Example 5)}×100

[0105] (6) Measurement of surface resistivity The 500 μm thick laminated sheets obtained in the examples and comparative examples were subjected to a pretreatment at 23° C. and 50% RH for 2 days, and then the surface resistivity and volume resistivity were measured in accordance with JIS K6911.

[0106] (7) Evaluation of fuzz The laminated sheets produced in the examples and comparative examples were slit into a width of 16 mm, and the cross sections were observed under a microscope. 〇: No burrs △: Fluff having a length less than the thickness of the sheet was partially generated. x: Fluff occurred all over the sheet, and some fluffs were longer than the thickness of the sheet.

[0107] (8) Measurement of volume-based median diameter and particle size distribution of rubber-like polymer particles (C1) A measurement sample was prepared by placing 10 to 15 pellets of the substrate resin composition sample and 20 ml of DMF in a 30 ml minicup and dispersing and dissolving them in an ultrasonic cleaner for 3 minutes. The weight-average diameter, integral distribution curve, 20% diameter (d20%), and 80% diameter (d80%) of the rubber-like polymer particles (C1) were then determined by laser diffraction and scattering using a Malvern Panalytical Mastersizer 3000 Hydro MV.

[0108] (7) MIT folding endurance (times) measurement The MIT folding endurance (number of times) was measured in both the MD and TD directions of the laminated sheets produced in the Examples and Comparative Examples described below in accordance with JIS P8115. The measurement results were evaluated according to the following criteria. ◯: The test piece did not break even after being bent more than 50 times. △: The test piece broke after being bent 31 times or more but less than 49 times. ×: The test piece broke after being bent 30 times or less.

[0109] "Raw materials and resins used in examples and comparative examples" (B1) Component: Impact-resistant polystyrene (B1-1) to (B1-5) A polymerization liquid obtained by mixing and dissolving 41.3 mass% of styrene as the styrene-based monomer (b1-1), 3.4 mass% of n-butyl acrylate and 36.4 mass% of methyl methacrylate as the (meth)acrylic acid ester monomer units (b1-2), 9.4 mass% of a styrene-butadiene block copolymer (Asahi Kasei Corporation: Asaprene 625A) as the rubber-like polymer (c1), 9.5 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 113°C / 116°C / 120°C. The reaction liquid was then sent to a 6.2-liter laminar flow reactor-2 equipped with a stirrer and capable of temperature control in three zones, which was connected in series to the laminar flow reactor-1. The stirrer rotation speed was set to 15 rpm, and the temperatures were set to 125°C / 131°C / 134°C. The reaction liquid was then sent to a 6.2-liter laminar flow reactor-3 equipped with a stirrer and capable of temperature control in three zones, which was set to 140°C / 145°C / 150°C. 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 impact-resistant polystyrene resin (B1-1). Then, 3000 ppm and 5000 ppm of stearic acid were blended with 100 parts by mass of the impact-resistant polystyrene resin (B1-1), and the mixture was melt-extruded at a temperature range of 180°C to 220°C using a twin-screw extruder (Toshiba Machine Co., Ltd., TEM-26SS) to obtain impact-resistant polystyrene resin (B1-2) (containing 3000 ppm of stearic acid) and impact-resistant polystyrene resin (B1-3) (containing 5000 ppm of stearic acid). Similarly, only the rotation speed of the laminar flow reactor-2 was changed to control the particle size of the rubber-like polymer particles (C1), and the pellets obtained were blended with stearic acid in the same manner as above to obtain high-impact polystyrene resins (B1-4) and (B1-5). The composition ratios of the high-impact polystyrene resins (B1-4) and (B1-5) were the same as those of (B1-1). The refractive index of each of the high-impact polystyrene resins (B1-1) to (B1-5) was 1.546.

[0110] Component (B2): Styrene-unsaturated carboxylic acid resin (B2) (also called compatibilizer) (B2-1) to (B2-3) Compatibilizer (B2-1): MM290, a styrene-(meth)acrylic acid ester-(meth)acrylic acid copolymer manufactured by PS Japan Co., Ltd., was selected. The refractive index was 1.570. Compatibilizer (B2-2): G9001, a styrene-(meth)acrylic acid copolymer manufactured by PS Japan Co., Ltd., was selected. The refractive index was 1.581. Compatibilizer (B2-3): SC004, a styrene-(meth)acrylic acid ester copolymer manufactured by PS Japan Co., Ltd., was selected. The refractive index was 1.573.

[0111] (antistatic agent) Antistatic agent (a1-1): "Pelectron AS, manufactured by Sanyo Chemical Industries, Ltd., refractive index 1.503 polyether ester amide"

[0112] Table 1 below shows the properties of the component (A): antistatic agent (a1-1), the component (B1): high-impact polystyrenes (B1-1) to (B1-5), and the component (B2): compatibilizers (B2-1) to (B2-3). [Table 1]

[0113] [Example] (Resin composition for base material) As the resin composition for substrate, pellets of the above-mentioned high-impact polystyrene resins (B1-1) to (B1-5) were used. (Antistatic resin composition) The components were blended in the composition ratios shown in Table 2 below, and melt-extruded using a twin-screw extruder (Toshiba Machine Co., Ltd., TEM-26SS) at a temperature range of 180 to 220°C to obtain resin pellets of the antistatic resin composition as a kneaded product. At this time, the screw rotation speed was 150 rpm, and the extrusion rate was 10 kg / hr.

[0114] (Example 1 and Examples 3 to 11: Method for producing laminated sheets) The resin composition for the substrate and the antistatic resin composition pellets were extruded using a Φ25mm extruder (manufactured by Soken Co., Ltd., L / D=25) for the surface layer, a Φ30mm extruder (manufactured by Soken Co., Ltd., L / D=38) for the substrate, and a 300mm wide two-type, three-layer T-die, with the thickness ratio adjusted to surface layer / substrate layer / surface layer being 5 / 90 / 5, to produce a laminated sheet. Extruder temperature is 200-230℃, T-die is 230-250℃ Roll temperature is 80℃ The take-up speed is 1.0 m / min. The target thickness of the surface layer was 25 μm, the target thickness of the base layer was 450 μm, and the total thickness of the laminate sheet was 500 μm. Various physical properties were evaluated for the laminate sheets of Examples 1 and 3 to 11. The results are shown in Table 2.

[0115] (Example 2: Method for producing laminated sheet containing recycled material) The waste material of the laminate sheet produced in Example 1 (including the surface layer and the substrate) was re-pelletized and then added to a portion of the resin composition for substrate to obtain a laminate sheet containing recycled material. Various physical properties of the laminate sheet containing recycled material were then evaluated. The haze change rate (%) of the laminate sheet containing recycled material was 10%.

[0116] (Example 12: Method for producing laminated sheet containing recycled material) The waste material of the laminate sheet produced in Example 5 (including the surface layer and substrate) was re-pelletized and then added to a portion of the resin composition for substrate to obtain a laminate sheet containing recycled material. Various physical properties of the laminate sheet containing recycled material were then evaluated. The haze change rate (%) of the laminate sheet containing recycled material was 0%.

[0117] [Comparative Examples 1 to 3] Comparative laminate sheets were produced after preparing precursor compositions for the sheets described in Comparative Examples 1 to 3 in the same manner as in Example 1, except that the compositions were changed as shown in Table 2. The results of measurement and evaluation of each physical property are shown in Table 2.

[0118] [Table 2]

[0119] The experimental results in Table 2 above confirm that the laminate sheet of this example is able to achieve both excellent transparency and high antistatic performance at a higher level than the comparative laminate sheets of the comparative examples. Furthermore, the experimental results of Examples 2 and 12 above confirm that the laminate sheet of this example maintains high transparency even after recycling, and therefore has excellent recycling properties. [Industrial Applicability]

[0120] The laminate sheet obtained by the present disclosure can achieve both excellent transparency and high antistatic performance at a high level, and is therefore useful as a packaging material for electronic components, particularly as a carrier tape. [Explanation of symbols]

[0121] 21 Carrier tape body 22 recess 23 Edge 24 through holes 25 Electronic Components 26 Seal part 27 Cover Tape

Claims

1. A laminated sheet having a substrate and an antistatic layer containing an antistatic resin composition laminated on one or both surfaces of the substrate, the antistatic layer contains 10 to 30% by mass of the following component (A), 50 to 90% by mass of the following component (B1), and 3 to 20% by mass of the following component (B2), The laminate sheet has a haze value of 15% or less, and the substrate is composed of the following component (B1): Component (A): Antistatic agent (a1) having an amide bond Component (B1): High-impact polystyrene (B1) Component (B2): styrene-unsaturated carboxylic acid resin (B2) containing styrene monomer units (b2-1) and (meth)acrylic acid monomer units (b2)

2. The refractive index (23° C.) of the impact-resistant polystyrene (B1), the styrene-unsaturated carboxylic acid resin (B2), and the antistatic agent (a1) is n Ｂ１ , n Ｂ２ , n Ａ Then, n Ａ <n Ｂ１ <n Ｂ２ The laminated sheet according to claim 1 , wherein the following relationship holds:

3. The (meth)acrylic acid-based monomer unit (b2) comprises one or more monomer units selected from the group consisting of the (meth)acrylic acid ester monomer unit (b2-2) and the (meth)acrylic acid monomer unit (b2-3).

4. 3. The laminate sheet according to claim 1, wherein the high-impact polystyrene (B1) comprises styrene-based monomer units (b1-1), (meth)acrylic acid ester monomer units (b1-2), and rubber-like polymer particles (C1), and the high-impact polystyrene (B1) contains 30 to 55% by mass of the styrene-based monomer units (b1-1) and 30 to 55% by mass of the (meth)acrylic acid ester monomer units (b1-2) relative to the total amount of the high-impact polystyrene (B1).

5. 4. The laminate sheet according to claim 3, wherein the styrene-unsaturated carboxylic acid resin (B2) contains 1 to 20% by mass of the (meth)acrylic acid ester monomer units (b2-2) and 2 to 30% by mass of the (meth)acrylic acid monomer units (b2-3), relative to the total amount of the styrene-unsaturated carboxylic acid resin (B2).

6. A carrier tape obtained by processing the laminated sheet according to claim 1 or 2.

7. an impact-resistant polystyrene (B1) containing styrene-based monomer units (b1-1), (meth)acrylic acid ester monomer units (b1-2), and rubber-like polymer particles (C1); a styrene-unsaturated carboxylic acid resin (B2) having a refractive index higher than that of the impact resistant polystyrene (B1), the resin containing a styrene monomer unit (b2-1) and a (meth)acrylic acid monomer unit (b2); A method for producing a laminate sheet using, as a surface layer, transparent antistatic pellets obtained by kneading an antistatic agent (a1) having an amide bond and having a refractive index smaller than that of the impact resistant polystyrene (B1).

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