Laminated sheets and electronic component housings

Abstract

To provide a laminated sheet that has excellent antistatic performance, and an electronic component storage container obtained by molding the laminated sheet.SOLUTION: There is provided a laminated sheet 10 for an electronic component storage container, which has a first outermost layer 11 and a second outermost layer 12. The first outermost layer 11 includes a first polymer-type antistatic agent.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] This invention relates to laminated sheets and electronic component housings. [Background technology]

[0002] Conventionally, various electronic components (for example, integrated circuits (ICs), capacitors, and semiconductors) are easily damaged by static electricity sparks, etc., and are therefore sealed in electronic component containers called carrier tapes or carrier trays, and then stored and transported after being sealed with cover tapes for electronic component packaging (Patent Document 1). [Prior art documents] [Patent Documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2012-214252 [Overview of the Initiative] [Problems that the invention aims to solve]

[0004] In recent years, as electronic components have become smaller and more sophisticated, the damage to these components caused by even slight static electricity during transportation and manufacturing has become a problem. This has led to an increasing demand for electronic component enclosures that offer superior antistatic performance against instantaneous static charge buildup.

[0005] The objective of the present invention is to provide a laminated sheet with excellent antistatic properties. Another object of the present invention is to provide an electronic component housing container formed by molding the laminated sheet. [Means for solving the problem]

[0006] According to one aspect of the present invention, a laminated sheet for an electronic component housing is provided, wherein the laminated sheet comprises a first outermost layer and a second outermost layer, and the first outermost layer contains a first polymer-type antistatic agent.

[0007] In a laminated sheet according to one aspect of the present invention, the content of the first polymer-type antistatic agent in the first outermost layer may be 10% by mass or more and 30% by mass or less.

[0008] In a laminated sheet according to one aspect of the present invention, the first outermost layer may be formed from a first resin composition kneaded with the first polymer-type antistatic agent.

[0009] In a laminated sheet according to one aspect of the present invention, the second outermost layer may contain a second polymer-type antistatic agent.

[0010] In a laminated sheet according to one aspect of the present invention, the content of the second polymer-type antistatic agent in the second outermost layer may be 10% by mass or more and 30% by mass or less.

[0011] In a laminated sheet according to one aspect of the present invention, the second outermost layer may be formed from a second resin composition kneaded with the second polymer-type antistatic agent.

[0012] In a laminated sheet according to one aspect of the present invention, at least one of the first polymer-type antistatic agent and the second polymer-type antistatic agent may be a polyether-based polymer-type antistatic agent.

[0013] In a laminated sheet according to one aspect of the present invention, the laminated sheet may have an oxygen barrier layer between the first outermost layer and the second outermost layer.

[0014] In a laminated sheet according to one aspect of the present invention, the oxygen barrier layer may be formed of a third resin composition containing an ethylene-vinyl alcohol copolymer.

[0015] In the laminated sheet according to one aspect of the present invention, at least one of the first resin composition and the second resin composition may contain a polyolefin resin.

[0016] In the laminated sheet according to one aspect of the present invention, the polyolefin resin may be two or more selected from the group consisting of a polypropylene resin, a polyethylene resin, and an ethylene-acrylic resin.

[0017] In the laminated sheet according to one aspect of the present invention, at least one of the first resin composition and the second resin composition may contain the polypropylene resin.

[0018] In the laminated sheet according to one aspect of the present invention, when the first resin composition contains the polypropylene resin, the content of the polypropylene resin in the first outermost layer may be 30% by mass or more and 70% by mass or less, and when the second resin composition contains the polypropylene resin, the content of the polypropylene resin in the second outermost layer may be 30% by mass or more and 70% by mass or less.

[0019] In the laminated sheet according to one aspect of the present invention, the laminated sheet has one or more intermediate layers between the first outermost layer and the second outermost layer, and the intermediate layer may include a layer formed of a fourth resin composition containing a polyolefin resin and an inorganic filler.

[0020] In the laminated sheet according to one aspect of the present invention, the fourth resin composition may further contain a hydrogenated petroleum resin.

[0021] In the laminated sheet according to one aspect of the present invention, the content of the hydrogenated petroleum resin in the layer formed of the fourth resin composition may be 20% by mass or less.

[0022] In the laminated sheet according to one aspect of the present invention, the fourth resin composition may further contain a maleic anhydride-modified polyolefin resin.

[0023] In the laminated sheet according to one aspect of the present invention, the inorganic filler may be magnesium hydroxide or talc.

[0024] In the laminated sheet according to one aspect of the present invention, the content of the inorganic filler in the layer formed of the fourth resin composition may be 40% by mass or less.

[0025] According to one aspect of the present invention, there is provided an electronic component housing container formed by molding the laminated sheet according to one aspect of the present invention.

[0026] In the electronic component housing container according to one aspect of the present invention, the first outermost layer may form the inner surface of the electronic component housing container.

Effects of the Invention

[0027] According to one aspect of the present invention, it is possible to provide a laminated sheet having excellent antistatic performance. According to another aspect of the present invention, it is possible to provide an electronic component housing container formed by molding the laminated sheet.

Brief Description of the Drawings

[0028] [Figure 1] It is a schematic cross-sectional view of a laminated sheet according to an embodiment of the present invention. [Figure 2] It is a schematic cross-sectional view of a laminated sheet according to another embodiment of the present invention. [Figure 3] It is a schematic cross-sectional view of a laminated sheet according to still another embodiment of the present invention. [Figure 4] It is a schematic view of an electronic component housing container according to an embodiment of the present invention.

Modes for Carrying Out the Invention

[0029] Embodiments of the present invention will be described in detail below with reference to the attached drawings. In this specification and the drawings, components having substantially the same functional configuration are denoted by the same reference numerals, and redundant explanations will be omitted.

[0030] [First Embodiment] [Laminated Sheet] In the first embodiment, a laminated sheet according to one aspect of the present invention will be described. Figure 1 is a schematic cross-sectional view of the laminated sheet 10 according to this embodiment. As shown in Figure 1, the laminated sheet 10 has a first outermost layer 11 and a second outermost layer 12. From the viewpoint of providing a thickness suitable for constructing an electronic component housing, the thickness of the laminated sheet 10 is specifically, for example, 0.3 mm to 1.2 mm, but is not limited to this example.

[0031] (The first outermost layer) The first outermost layer 11 contains a first polymer-type antistatic agent. Herein, "polymeric antistatic agent" as used herein refers to a polymer with high molecular weight that imparts antistatic properties to a layer containing the substance. By including such an antistatic agent as the first polymer-type antistatic agent in the first outermost layer 11, the laminated sheet 10 has antistatic performance suitable for use as an electronic component housing.

[0032] The content of the first polymer-type antistatic agent in the first outermost layer 11 is preferably 10% by mass or more and 30% by mass or less. If the content of the first polymer-type antistatic agent in the first outermost layer 11 is 10% by mass or more, the laminated sheet 10 can be effectively given antistatic performance. Furthermore, if the content of the first polymer-type antistatic agent in the first outermost layer 11 is 30% by mass or less, good antistatic performance in the laminated sheet 10 can be maintained while keeping costs down. It is more preferable that the content of the first polymer-type antistatic agent in the first outermost layer 11 is 10% by mass or more and 25% by mass or less. If the content of the first polymer-type antistatic agent in the first outermost layer 11 is 25% by mass or less, a good sheet appearance can be obtained while keeping costs down.

[0033] The first polymeric antistatic agent is preferably a polyether-based polymeric antistatic agent, or a polymer having a hydrophilic segment, the antistatic properties of which are imparted by the hygroscopicity of the hydrophilic segment. Examples of such polymeric antistatic agents include lipophilic polymer / hydrophilic polymer block copolymers such as polyether / polyolefin block copolymers, and polyether ester amides. From the viewpoint of improving antistatic performance, polyether-based polymeric antistatic agents are preferred, and polyether / polyolefin copolymers are more preferred. To suppress defects in the appearance of the sheet, defects in the appearance of the sealing surface, and fuzzing, a polyether-based polymer type antistatic agent having a melting point of 90°C to 150°C as measured by differential scanning calorimetry (DSC) is preferred. Furthermore, a polyether-based polymer type antistatic agent having a melting point of 90°C to 135°C as measured by differential scanning calorimetry (DSC) is more preferred because it exhibits excellent peelability from the lid member when used as an electronic component housing container. A polyether / polyolefin copolymer is more preferably one having a melting point of 110°C to 135°C as measured by differential scanning calorimetry (DSC). Examples of polyether-based polymer antistatic agents include Perectron PVH, Perectron PVL, and Perectron LMP-FS (all manufactured by Sanyo Chemical Industries, Ltd.), as well as Adeka Stab AS-301E (manufactured by ADEKA Corporation).

[0034] The first outermost layer 11 is formed from a first resin composition containing a first polymer-type antistatic agent and a resin. Preferably, the first resin composition is a resin composition obtained by kneading the first polymer-type antistatic agent and a resin. By forming the first outermost layer 11 with the first resin composition obtained by kneading the first polymer-type antistatic agent and a resin, it is possible to impart higher antistatic performance to the laminated sheet 10 without bleeding occurring in the first outermost layer 11.

[0035] Examples of resins included in the first resin composition include general resins used in packaging materials. Specifically, examples include polyolefin resins, polyethylene terephthalate resins (PET), nylon resins (Ny), and polystyrene resins (PS). Polyolefin resins are preferred as the resin included in the first resin composition. If a polyolefin resin is used, the laminated sheet 10 exhibits excellent film-forming properties even when used in combination with a polymer-type antistatic agent. Furthermore, even when the laminated sheet 10 is molded into an electronic component housing container, it can maintain suitable ease of opening and sealing properties. Moreover, because polyolefin resins have a low specific gravity, they can provide an electronic component housing container with excellent moisture resistance.

[0036] The first resin composition may also contain additives in addition to the first polymer-type antistatic agent and the resin described above.

[0037] The thickness of the first outermost layer 11 is preferably 10 μm or more. If the thickness of the first outermost layer 11 is 10 μm or more, there is no risk of delamination during opening of the electronic component housing container formed from the laminated sheet 10, and stable opening is obtained. On the other hand, there is no particular upper limit to the thickness. Considering a practical range, it is preferably 200 μm or less.

[0038] (The second outermost layer) The second outermost layer 12 is selected based on the intended use of the second outermost layer 12 in the laminated sheet 10. For example, the second outermost layer 12 may be a base layer. When the second outermost layer 12 is a base layer, its material is not particularly limited. In this embodiment, the second outermost layer 12 as a base layer is preferably made of resin. When the second outermost layer 12 as a base layer is made of resin, examples of such resins include polyolefin resins, nylon resins, and polyester resins.

[0039] Furthermore, for example, the second outermost layer 12 may contain a second polymer-type antistatic agent, similar to the first outermost layer 11. For example, when it is required to prevent static charge buildup both inside and outside the container when the laminated sheet 10 is molded into an electronic component housing container, it is effective for the second outermost layer 12 to contain a second polymer-type antistatic agent.

[0040] If the second outermost layer 12 contains a second polymer-type antistatic agent, the content of the second polymer-type antistatic agent in the second outermost layer 12 is preferably 10% by mass or more and 30% by mass or less. If the content of the second polymer-type antistatic agent in the second outermost layer 12 is 10% by mass or more, The laminated sheet 10 can be effectively given antistatic properties. Furthermore, if the content of the second polymer-type antistatic agent in the second outermost layer 12 is 30% by mass or less, the cost can be reduced while maintaining good antistatic performance in the laminated sheet 10. It is more preferable that the content of the second polymer-type antistatic agent in the second outermost layer 12 be 10% by mass or more and 25% by mass or less. If the content of the second polymer-type antistatic agent in the second outermost layer 12 is 25% by mass or less, a good sheet appearance can be obtained while keeping costs down.

[0041] Examples of the second type of polymeric antistatic agent include, for example, polyether-based polymeric antistatic agents, or polymers having hydrophilic segments, the antistatic properties of which are imparted by the hygroscopicity of the hydrophilic segments. Examples of such polymeric antistatic agents include lipophilic / hydrophilic polymer block copolymers such as polyether / polyolefin block copolymers, and polyether ester amides. From the viewpoint of improving antistatic performance, polyether-based polymeric antistatic agents are preferred, and polyether / polyolefin copolymers are more preferred. To suppress defects in the appearance of the sheet, defects in the appearance of the sealing surface, and fuzzing, a polyether-based polymer type antistatic agent having a melting point of 90°C to 150°C as measured by differential scanning calorimetry (DSC) is preferred. Furthermore, a polyether-based polymer type antistatic agent having a melting point of 90°C to 135°C as measured by differential scanning calorimetry (DSC) is more preferred because it exhibits excellent peelability from the lid member when used as an electronic component housing container. A polyether / polyolefin copolymer is more preferably one having a melting point of 110°C to 135°C as measured by differential scanning calorimetry (DSC). Examples of polyether-based polymer antistatic agents in the second polymer antistatic agent category can be similar to those of polyether-based polymer antistatic agents in the first polymer antistatic agent category.

[0042] When the second outermost layer 12 contains a second polymer-type antistatic agent, the second outermost layer 12 is formed from a second resin composition containing the second polymer-type antistatic agent and a resin. Preferably, the second resin composition is a resin composition obtained by kneading the second polymer-type antistatic agent and a resin. By forming the second outermost layer 12 from a second resin composition obtained by kneading the second polymer-type antistatic agent and a resin, higher antistatic performance can be imparted to the laminated sheet 10 without bleeding occurring in the second outermost layer 12.

[0043] Examples of resins included in the second resin composition include general resins used in packaging materials. Specifically, examples include polyolefin resins, polyethylene terephthalate resins (PET), nylon resins (Ny), and polystyrene resins (PS). Polyolefin resins are preferred as the resin included in the second resin composition. If a polyolefin resin is used, the laminated sheet 10 exhibits excellent film-forming properties even when used in combination with a polymer-type antistatic agent. Furthermore, even when the laminated sheet 10 is molded into an electronic component housing container, it can maintain suitable ease of opening and sealing properties. Moreover, because polyolefin resins have a low specific gravity, they can provide an electronic component housing container with excellent moisture resistance.

[0044] The second resin composition may also contain additives in addition to the second polymer-type antistatic agent and the resin described above.

[0045] The thickness of the second outermost layer 12 is not particularly limited. The thickness of the second outermost layer 12 is set appropriately according to the role that the second outermost layer 12 plays. For example, the second outermost layer 12 is 10 μm or more and 1000 μm or less, and preferably 100 μm or more and 300 μm or less.

[0046] In this embodiment, when the second outermost layer 12 contains a second polymer-type antistatic agent, the first polymer-type antistatic agent and the second polymer-type antistatic agent may be the same or different. From the viewpoint of improving antistatic performance, it is preferable that at least one of the first polymer-type antistatic agent and the second polymer-type antistatic agent is a polyether-based polymer-type antistatic agent, and it is more preferable that both the first polymer-type antistatic agent and the second polymer-type antistatic agent are polyether-based polymer-type antistatic agents.

[0047] In this embodiment, if the first outermost layer 11 is formed from a first resin composition mixed with a first polymer-type antistatic agent, or the second outermost layer 12 is formed from a second resin composition mixed with a second polymer-type antistatic agent, or both, it is preferable that at least one of the first resin composition and the second resin composition contains a polyolefin resin, and it is preferable that both the first resin composition and the second resin composition contain a polyolefin resin. If a polyolefin resin is used, the laminated sheet 10 exhibits excellent film-forming properties even when used in combination with a polymer-type antistatic agent. Furthermore, even when the laminated sheet 10 is molded into an electronic component housing container, it can maintain suitable ease of opening and sealing properties. In addition, because polyolefin resins have a low specific gravity, they can provide electronic component housing containers with excellent moisture resistance.

[0048] In this embodiment, it is preferable that the polyolefin resin contained in at least one of the first resin composition and the second resin composition is two or more types selected from the group consisting of polypropylene resins, polyethylene resins, and ethylene-acrylic resins.

[0049] Examples of polypropylene resins include homopolypropylene (HPP), random polypropylene (RPP), and block polypropylene (BPP). Examples of polyethylene resins include low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), and high-density polyethylene (HDPE). Examples of ethylene-acrylic resins include ethylene-acrylic acid copolymers, ethylene-methacrylic acid copolymers, ethylene-acrylic acid ester copolymers, and ethylene-methacrylic acid ester copolymers. A specific example of an ethylene-acrylic resin is Lexpearl ET220X (manufactured by Nippon Polyethylene Co., Ltd.).

[0050] In this embodiment, it is preferable that at least one of the first resin composition and the second resin composition contains a polypropylene resin, and it is more preferable that at least one of the first resin composition and the second resin composition contains a mixed resin of a polypropylene resin and an ethylene-acrylic resin, or a mixed resin of a polypropylene resin and a polyethylene resin. These mixed resins make it possible to provide an electronic component housing container that is both easy to open and airtight without using a special lid member.

[0051] When the first resin composition contains a polypropylene resin, it is preferable that the content of the polypropylene resin in the first outermost layer 11 is 30% by mass or more and 70% by mass or less. Furthermore, when the second resin composition contains a polypropylene resin, it is preferable that the content of the polypropylene resin in the second outermost layer 12 is 30% by mass or more and 70% by mass or less. Thus, if the polypropylene resin content is 30% by mass or more, when the laminated sheet 10 is used as an electronic component housing container, strong adhesion to the lid member is achieved, resulting in good adhesion and heat resistance. Furthermore, if the polypropylene resin content is 70% by mass or less, appropriate adhesion can be maintained, and the lid member and the electronic component housing container can be opened easily when peeling off the lid member.

[0052] Methods for manufacturing the laminated sheet 10 include, for example, preparing a first resin composition containing a first polymer-type antistatic agent and a second resin composition containing a second polymer-type antistatic agent, and co-extruding the first and second resin compositions; extruding the material for the first outermost layer 11 (the first resin composition containing the first polymer-type antistatic agent) onto a pre-manufactured second outermost layer 12; laminating a film corresponding to the first outermost layer 11 and a film corresponding to the second outermost layer 12; and preparing a coating liquid containing the material for the first outermost layer 11 in advance and coating the pre-manufactured second outermost layer 12 with the coating liquid.

[0053] (Effects of this embodiment) The laminated sheet 10 according to this embodiment has a first outermost layer 11 and a second outermost layer 12, and the first outermost layer 11 contains a first polymer-type antistatic agent. Therefore, the laminated sheet 10 has excellent antistatic performance for use as an electronic component housing container.

[0054] [Second Embodiment] [Laminated Sheet] In the second embodiment, a laminated sheet according to another aspect of the present invention will be described. Figure 2 is a schematic cross-sectional view of the laminated sheet 20 according to this embodiment. As shown in Figure 2, the laminated sheet 20 has an oxygen barrier layer 13 between the first outermost layer 11 and the second outermost layer 12. From the viewpoint of providing a thickness suitable for constructing an electronic component housing, the thickness of the laminated sheet 20 is specifically, for example, 0.3 mm to 1.2 mm, but is not limited to this example.

[0055] (Oxygen barrier layer) For the oxygen barrier layer 13, resin-based materials such as polyamide resins, polyethylene terephthalate resins, ethylene-vinyl alcohol resins, and polyvinylidene chloride can be used. The oxygen barrier layer 13 is preferably formed from a third resin composition containing ethylene-vinyl alcohol copolymer (EVOH). The oxygen barrier layer 13 containing EVOH provides high oxygen barrier properties.

[0056] Thickness T of oxygen barrier layer 13 OB This is the ratio to the total thickness T of the laminated sheet 20, from the viewpoint of both oxygen barrier properties and cost [(T OB It is preferable that the ratio of [ / T) × 100] is between 2% and 15%.

[0057] Methods for manufacturing the laminated sheet 20 include, for example, a method in which a first resin composition is extruded onto one side of the oxygen barrier layer 13 to laminate a first outermost layer 11, and a second resin composition is extruded onto the other side of the oxygen barrier layer 13 to laminate a second outermost layer 12; a method in which the material for the oxygen barrier layer 13 and the first resin composition are co-extruded onto the second outermost layer 12 to laminate the oxygen barrier layer 13 and the first outermost layer 11 onto the second outermost layer 12; and a method in which the first resin composition, the material for the oxygen barrier layer 13, and the second resin composition are extruded at once to simultaneously laminate the three layers of the first outermost layer 11, the oxygen barrier layer 13, and the second outermost layer 12.

[0058] (Effects of this embodiment) The laminated sheet 20 according to this embodiment has an oxygen barrier layer 13. Therefore, the laminated sheet 20 has excellent antistatic performance for use as an electronic component housing, as well as high oxygen barrier properties.

[0059] [Third Embodiment] [Laminated Sheet] In the third embodiment, a laminated sheet according to yet another aspect of the present invention will be described. Figure 3 is a schematic cross-sectional view of the laminated sheet 30 according to this embodiment. The laminated sheet 30 has a first outermost layer 11, a second outermost layer 12, and an oxygen barrier layer 13. Furthermore, the laminated sheet 30 has one or more intermediate layers 14 between the first outermost layer 11 and the second outermost layer 12. From the viewpoint of providing a thickness suitable for constructing an electronic component housing, the thickness of the laminated sheet 30 is specifically, for example, 0.3 mm or more and 1.2 mm or less, but is not limited to this example.

[0060] (Middle class) The laminated sheet 30 includes an intermediate layer 14 between the first outermost layer 11 and the oxygen barrier layer 13, consisting of a base layer 140, a water vapor barrier layer 141, and an adhesive layer 142. The laminated sheet 30 also includes an intermediate layer 14 between the second outermost layer 12 and the oxygen barrier layer 13, consisting of an adhesive layer 143 and a water vapor barrier layer 144. In the laminated sheet 30, the second outermost layer 12, the water vapor barrier layer 144, the adhesive layer 143, the oxygen barrier layer 13, the adhesive layer 142, the water vapor barrier layer 141, the base layer 140, and the first outermost layer 11 are laminated in this order, and each layer is in contact with the others.

[0061] The base layer 140, which serves as the intermediate layer 14, can have the same configuration as, for example, the second outermost layer 12.

[0062] The water vapor barrier layers 141 and 144, which serve as the intermediate layer 14, are preferably formed from a fourth resin composition containing a polyolefin resin and an inorganic filler. Including a polyolefin resin and an inorganic filler in the fourth resin composition forming the water vapor barrier layers 141 and 144 improves the water vapor barrier properties.

[0063] Examples of polyolefin resins included in the fourth resin composition include polypropylene, high-density polyethylene, and cyclic polyolefins. When the fourth resin composition forming the water vapor barrier layers 141 and 144 contains polypropylene, for example, by using homopolypropylene, which is a polypropylene homopolymer with an isotactic pentad fraction of the propylene chain portion of 0.92 or higher, higher water vapor barrier and oxygen barrier properties can be achieved while maintaining properties such as thermoformability.

[0064] Examples of inorganic fillers in this embodiment include carbon black, graphite, silicon carbide, silica, quartz powder, hydrotalcite, magnesium hydroxide, carbonates (e.g., calcium carbonate and magnesium carbonate), silicates (e.g., calcium silicate, aluminum silicate, talc, mica, kaolin, clay, diatomaceous earth and wollastonite), metal oxides (e.g., iron oxide, titanium oxide, zinc oxide and alumina), and sulfates (e.g., calcium sulfate and barium sulfate). Because the labyrinth effect further improves the water vapor barrier properties, the inorganic filler included in the fourth resin composition is preferably magnesium hydroxide or talc, and a larger aspect ratio is more preferable.

[0065] In order to maintain the fluidity of the inorganic filler and the good thermoformability of the laminated sheet 30, the inorganic filler content in the layer formed by the fourth resin composition is preferably 40% by mass or less. Furthermore, if the inorganic filler content is 40% by mass or less, it is possible to avoid situations where the specific gravity of the inorganic filler is too high and the mass becomes a problem.

[0066] In this embodiment, the fourth resin composition forming the water vapor barrier layers 141 and 144 may further contain a hydrogenated petroleum resin in addition to the polyolefin resin and inorganic filler. By including a hydrogenated petroleum resin in the fourth resin composition, water vapor permeation leaking from the amorphous portion of the crystalline resin can be suppressed, and the water vapor barrier properties of the water vapor barrier layers 141 and 144 are further improved. The hydrogenated petroleum resin content in the layer formed by the fourth resin composition is preferably 20% by mass or less, from the viewpoint of good water vapor barrier properties and avoidance of contamination due to bleeding.

[0067] In this embodiment, the fourth resin composition may further include a maleic anhydride-modified polyolefin resin in addition to a polyolefin resin and an inorganic filler, and optionally a hydrogenated petroleum resin. Adding the maleic anhydride-modified polyolefin resin to the fourth resin composition improves the impact resistance of the laminated sheet 30. For example, a maleic anhydride-modified polyolefin resin can be used, in which the degree of acid modification is 2.2% by mass or more. From the viewpoint of impact resistance, the fourth resin composition may contain, in place of, maleic anhydride-modified polyolefin resin, or together with maleic anhydride-modified polyolefin resin, thermoplastic elastomers such as olefin-based elastomers, urethane-based elastomers, styrene-based elastomers, and ethylene vinyl acetate (EVA).

[0068] For the adhesive layers 142 and 143 as the intermediate layer 14, for example, an unsaturated carboxylic acid or a derivative of an unsaturated carboxylic acid-modified polyolefin resin, or a polyvinylidene chloride-based resin can be used.

[0069] The thickness of the intermediate layer 14 is not particularly limited. The thickness of the intermediate layer 14 is set appropriately depending on the intended use of the layer included as an intermediate layer. The total thickness T of the water vapor barrier layers 141 and 144 WB From the viewpoint of water vapor barrier properties, film formation properties, and cost, the ratio of [(T] to the total thickness T of the laminated sheet 30 is considered. WB It is preferable that the ratio of [ / T) × 100] be between 30% and 70%, and more preferably between 40% and 60%.

[0070] The laminated sheet 30 can be manufactured, for example, by a multilayer extrusion molding method using a T-die.

[0071] (Effects of this embodiment) In the laminated sheet 30 according to this embodiment, high oxygen barrier properties are achieved by the oxygen barrier layer 13. Furthermore, high water vapor barrier properties are achieved by the water vapor barrier layers 141 and 144 containing polyolefin resin and inorganic filler, and even when the oxygen barrier layer is formed with a resin that has high humidity dependence of oxygen barrier properties, a decrease in the oxygen barrier properties of the oxygen barrier layer can be prevented, and high oxygen barrier properties can be maintained. Thus, the laminated sheet 30 has high antistatic performance even in low humidity environments and possesses good oxygen barrier and water vapor barrier properties for use in electronic component housings.

[0072] [Fourth Embodiment] [Electronic component housing] The laminated sheet 10 according to the first embodiment, the laminated sheet 20 according to the second embodiment, and the laminated sheet 30 according to the third embodiment can all be used to form an electronic component housing container. In the fourth embodiment, an electronic component housing container formed using a laminated sheet according to one aspect of the present invention will be described. Figure 4 is a schematic diagram of the electronic component housing container 100 according to this embodiment. The electronic component housing container 100 shown in Figure 4 is formed by molding the laminated sheet 30 according to the third embodiment.

[0073] The electronic component housing container 100 using the laminated sheet 30 can be formed by various molding methods, such as vacuum pressure forming, vacuum forming, pressure forming, and plug-assisted molding.

[0074] In the electronic component housing container 100, the first outermost layer 11 forms the inner surface (the surface in contact with the contents inside the electronic component housing container 100) 100A of the electronic component housing container 100. Since the first outermost layer 11 contains the first polymer-type antistatic agent, when electronic components are housed in the electronic component housing container 100 and transported, high antistatic performance is exhibited against instantaneous static electricity and other charges.

[0075] (Effects of this embodiment) As described above, the laminated sheet 30 has high antistatic performance even in low humidity environments and is a laminated sheet that has good oxygen barrier and water vapor barrier properties for use as an electronic component housing container. The electronic component housing container 100 obtained by molding such a laminated sheet 30 has excellent antistatic properties, easy-to-open sealability, and oxygen and water vapor barrier properties. Therefore, the electronic component housing container 100 of this embodiment can be suitably used as a container for housing electronic components such as precision machine parts, ICs, capacitors, and semiconductors. Furthermore, the electronic component housing container 100 prevents oxidative degradation of the electronic components until the electronic components are opened, i.e., until they are used, thereby reducing the risk of damage to the electronic components. Furthermore, since the electronic component storage container 100 is a container that allows for long-term storage of electronic components, it expands the flexibility of production timing and, consequently, can improve productivity. [Examples]

[0076] The following describes examples of the present invention. The present invention is not limited in any way by these examples.

[0077] [Examples 1-11 and Comparative Examples 1-3] The following components were mixed in the mass ratios shown in Table 1 to prepare resin compositions for forming each layer. Using the prepared resin compositions, laminated sheets of Examples 1-11 and Comparative Examples 1-3 were manufactured using a distributor-type extrusion multilayer sheet manufacturing apparatus. The thickness of the laminated sheets was 1 mm.

[0078] (Various ingredients) • Resin a: Homopolypropylene E111G (manufactured by Prime Polymer Co., Ltd.) • Resin b: Random polypropylene F-724NP (manufactured by Prime Polymer Co., Ltd.) • Resin c: Low-density polyethylene R300 (manufactured by Ube Maruzen Polyethylene Co., Ltd.) • Resin d: Ethylene-acrylic acid ester-maleic anhydride Rexpearl ET220X (manufactured by Nippon Polyethylene Co., Ltd.) • Resin e: Modic P674V (manufactured by Mitsubishi Chemical Corporation) • Resin f: Ethylene-vinyl alcohol copolymer resin EVAL J (manufactured by Kuraray Co., Ltd.) • Polymer-type antistatic agent a: Perectron PVH (manufactured by Sanyo Chemical Industries, Ltd.) • Polymer-type antistatic agent b: Perectron PVL (manufactured by Sanyo Chemical Industries, Ltd.) • Polymer-type antistatic agent c: Pelektron LMP-FS (manufactured by Sanyo Chemical Industries, Ltd.) • Low molecular weight antistatic agent d: Fatty acid ester-based antistatic agent Talc: Average particle size 5 μm, aspect ratio 17 Magnesium hydroxide: Average particle size 4 μm, aspect ratio 67 • Hydrogenated petroleum resin: Product name iMarb, Grade name P-140 (manufactured by Idemitsu Kosan Co., Ltd.)

[0079] [Evaluation of laminated sheets] The laminated sheets prepared in Examples 1-11 and Comparative Examples 1-3 were evaluated as follows. The evaluation results are shown in Tables 1-3.

[0080] <Antistatic performance> The antistatic performance was evaluated by measuring the time it took for the charge in each laminated sheet to decay from 5000V to 50V under conditions of 23±5℃ and 12±3%RH, in accordance with the charge decay measurement method (FEDERAL TEST METHOD 101, METHOD 4046.1) RCJS5-1. The evaluation criteria were as follows: (Evaluation Criteria) A: Decay time is 2 seconds or less C: Decay time exceeds 2 seconds.

[0081] <Oxygen permeability> Oxygen permeability was measured and evaluated for each laminated sheet in an environment of 23°C and 50% RH, based on the JIS K7126-2B method (2006 edition). The evaluation criteria were as follows, in two stages. (Evaluation Criteria) A: 1cm 3 / m 2 Less than a day C: 1cm 3 / m 2 • days or more

[0082] <Water vapor transmission rate> The water vapor permeability was measured and evaluated for each laminated sheet under the environment of a temperature of 40 °C and a relative humidity of 90% RH based on JIS K7129 B method (2019 edition). The evaluation criteria were divided into the following two levels. (Evaluation Criteria) AA: 0.2 g / m 2 · Less than 24 hr A: 0.4 g / m 2 · Less than 24 hr

[0083] <Ease of opening> For the ease of opening, a thermal gradient tester was used as the sealing machine. A sealant material (a three-layer sheet laminated with polyethylene terephthalate, nylon, and non-axially stretched polypropylene in this order) was sealed to each laminated sheet under the sealing conditions: 0.20 MPa, 1 second, 180 °C, and a seal width of 15 mm. Then, the seal strength when peeling at a peeling angle of 180° at a speed of 200 mm / min with a tensile tester was measured. The evaluation was divided into the following two levels. (Evaluation Criteria) A: Seal strength of 0.2 kgf / 15 mm or more and less than 1.5 kgf / 15 mm C: Seal strength of 1.5 kgf / 15 mm or more

[0084] <Appearance of seal surface> The appearance of the seal surface was evaluated by observing the presence or absence of fluffing during seal peeling and visually inspecting after seal peeling in the above ease-of-opening evaluation. The evaluation was divided into the following three levels. (Evaluation Criteria) A: The appearance of the seal surface is good and there is no fluffing during peeling. B: The appearance of the seal surface is slightly rough and there is slightly visible fluffing during peeling. C: The appearance of the seal surface is rough and there is visible fluffing during peeling.

[0085] [Table 1]

[0086] [Table 2]

[0087] [Table 3]

[0088] The results shown in Tables 1-3 indicate that the laminated sheets of Examples 1-11, which used a polymer-type antistatic agent in the first outermost layer, exhibit superior antistatic performance compared to the laminated sheets of Comparative Examples 1-3, which did not use a polymer-type antistatic agent in the first outermost layer.

[0089] Although embodiments of the present invention have been described in detail above with reference to the attached drawings, the present invention is not limited to these examples. It is clear to any person with ordinary skill in the art to which the present invention belongs that various modifications or variations can be conceived within the scope of the technical idea described in the claims, and these are also understood to naturally fall within the technical scope of the present invention. [Explanation of symbols]

[0090] 10...Laminated sheet, 11...First outermost layer, 12...Second outermost layer, 13...Oxygen barrier layer, 14...Intermediate layer, 100...Electronic component housing container.

Claims

1. A laminated sheet for electronic component housing containers, The laminated sheet has a first outermost layer and a second outermost layer. The first outermost layer contains a first polymer-type antistatic agent. The first outermost layer is formed from a first resin composition in which the first polymer-type antistatic agent is kneaded. The first resin composition includes a mixed resin of a polypropylene resin and an ethylene-acrylic resin, or a mixed resin of a polypropylene resin and a polyethylene resin. The polypropylene resin in the first outermost layer comprises one or more types selected from the group consisting of homopolypropylene and random polypropylene. The polyethylene resin in the first outermost layer is low-density polyethylene, linear low-density polyethylene, or high-density polyethylene. A laminated sheet in which the charge decay time from 5000V to 50V is 2 seconds or less, measured in an environment of 23±5°C and 12±3%RH in accordance with the RCJS5-1 method for measuring charge decay.

2. The content of the first polymer-type antistatic agent in the first outermost layer is 10% by mass or more and 30% by mass or less. The laminated sheet according to claim 1.

3. The content of the polypropylene resin in the first outermost layer is 30% by mass or more and 70% by mass or less. The laminated sheet according to claim 1 or claim 2.

4. The second outermost layer contains a second polymer-type antistatic agent. A laminated sheet according to any one of claims 1 to 3.

5. The content of the second polymer-type antistatic agent in the second outermost layer is 10% by mass or more and 30% by mass or less. The laminated sheet according to claim 4.

6. At least one of the first polymer-type antistatic agent and the second polymer-type antistatic agent However, it is a polyether-based polymer type antistatic agent. The laminated sheet according to claim 4 or claim 5.

7. The second outermost layer is formed of a second resin composition in which the second polymer-type antistatic agent is kneaded. The laminated sheet according to any one of claims 4 to 6.

8. The second resin composition includes a polyolefin resin. The laminated sheet according to claim 7.

9. The aforementioned polyolefin resin is two or more types selected from the group consisting of polypropylene resin, polyethylene resin, and ethylene-acrylic resin. The laminated sheet according to claim 8.

10. The second resin composition comprises the polypropylene resin, The laminated sheet according to claim 9.

11. The content of the polypropylene resin in the second outermost layer is 30% by mass or more and 70% by mass or less. The laminated sheet according to claim 10.

12. The laminated sheet has an oxygen barrier layer between the first outermost layer and the second outermost layer. A laminated sheet according to any one of claims 1 to 11.

13. The oxygen barrier layer is formed of a third resin composition containing an ethylene-vinyl alcohol copolymer. The laminated sheet according to claim 12.

14. The laminated sheet has one or more intermediate layers between the first outermost layer and the second outermost layer, and the intermediate layer includes a layer formed of a fourth resin composition containing a polyolefin resin and an inorganic filler. A laminated sheet according to any one of claims 1 to 13.

15. The fourth resin composition further comprises a hydrogenated petroleum resin. The laminated sheet according to claim 14.

16. The hydrogenated petroleum resin content in the layer formed by the fourth resin composition is 20% by mass or less. The laminated sheet according to claim 15.

17. The fourth resin composition further comprises a maleic anhydride-modified polyolefin resin. The laminated sheet according to any one of claims 14 to 16.

18. The inorganic filler is magnesium hydroxide or talc. The laminated sheet according to any one of claims 14 to 17.

19. The content of the inorganic filler in the layer formed by the fourth resin composition is 40% by mass or less. The laminated sheet according to any one of claims 14 to 18.

20. An electronic component housing container formed by molding a laminated sheet according to any one of claims 1 to 19.

21. The first outermost layer forms the inner surface of the electronic component housing container. The electronic component housing container according to claim 20.

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