Laminated sheet and member for part transport

Abstract

To provide a laminated sheet having sufficient wear resistance while omitting an adhesive layer between a surface layer and a base layer.SOLUTION: A laminated sheet 10 has a base layer 11 and a surface layer 13 laminated directly on the base layer 11, the surface layer 13 comprising an ionomer in which the metal ion is Zn. The surface layer 13 has a thickness of 0.15 mm or more. When measured in accordance with JIS K7204:1999 under the conditions of abrasion wheel CS-17, rotation speed 60 rpm, number of rotations 1000, and applied load 9.8 N, the Taber abrasion loss of the surface layer 13 is 15 mg or less.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a laminated sheet and a component transport member. [Background technology]

[0002] Patent Documents 1 and 2 disclose multilayer sheets that include an adhesive layer that bonds an abrasion-resistant layer and a substrate layer. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2023-094343 [Patent Document 2] Patent No. 7279252 Summary of the Invention [Problem to be solved by the invention]

[0004] Conventional laminate sheets have an adhesive layer between the wear-resistant surface layer and the base layer. It is desirable to simplify the equipment for manufacturing laminate sheets and reduce the number of manufacturing steps by eliminating this adhesive layer. The present disclosure aims to provide a laminate sheet that has sufficient wear resistance while eliminating the adhesive layer between the surface layer and the base layer. The present disclosure can be realized in the following forms. [Means for solving the problem]

[0005] A laminated sheet having a base layer and a surface layer directly laminated on the base layer, the surface layer contains an ionomer in which the metal ion is Zn, The thickness of the surface layer is 0.15 mm or more, A laminated sheet, wherein the Taber abrasion amount of the surface layer is 15 mg or less, measured in accordance with JIS K7204:1999 under conditions of an abrasion wheel CS-17, a rotation speed of 60 rpm, a rotation number of 1000, and an applied force of 9.8 N. [Effects of the Invention]

[0006] According to the present disclosure, it is possible to provide a laminate sheet that has sufficient abrasion resistance while omitting an adhesive layer between the surface layer and the base layer. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 2 is a cross-sectional view of a laminated sheet. DETAILED DESCRIPTION OF THE INVENTION

[0008] Here, a preferred example of the present disclosure will be described. [1] A laminated sheet having a base layer and a surface layer directly laminated on the base layer, the surface layer contains an ionomer in which the metal ion is Zn; The thickness of the surface layer is 0.15 mm or more, A laminated sheet, wherein the Taber abrasion amount of the surface layer is 15 mg or less, measured in accordance with JIS K7204:1999 under conditions of an abrasion wheel CS-17, a rotation speed of 60 rpm, a rotation number of 1000, and an applied force of 9.8 N. [2] The laminate sheet according to [1], wherein both the base layer and the surface layer contain ethylene vinyl acetate copolymer. [3] The laminate sheet according to [1] or [2], wherein at least one of the base layer and the surface layer has an uneven shape on the lamination surface. [4] A vehicle interior material comprising the laminate sheet according to any one of [1] to [3].

[0009] The present disclosure will be described in detail below. In this specification, when a numerical range is indicated using "-", it is intended to include both the lower limit and the upper limit unless otherwise specified. For example, the expression "10-20" includes both the lower limit "10" and the upper limit "20". In other words, "10-20" has the same meaning as "10 or more and 20 or less". In addition, in this specification, the upper limit and lower limit of each numerical range can be combined in any way.

[0010] 1. Laminated sheet 10 The laminate sheet 10 of this embodiment has a base layer 11 and a surface layer 13 laminated directly on the base layer 11. The surface layer 13 contains an ionomer in which the metal ion is Zn. The thickness of the surface layer 13 is 0.15 mm or more. The Taber abrasion of the surface layer 13 is 15 mg or less, measured in accordance with JIS K7204:1999 under conditions of an abrasive wheel CS-17, a rotation speed of 60 rpm, a rotation number of 1000 rpm, and an applied force of 9.8 N.

[0011] As shown in Fig. 1, the laminate sheet 10 may have a two-layer structure of a base layer 11 and a surface layer 13. Alternatively, the laminate sheet 10 may have a multi-layer structure of two or more layers, for example, with another layer laminated on the back side. In the laminate sheet 10, the base layer 11 and the surface layer 13 are directly laminated. "Directly laminated" means that the base layer 11 and the surface layer 13 are laminated such that at least a portion of them is in contact with each other.

[0012] (1) Base material layer 11 The substrate layer 11 is not particularly limited. From the viewpoint of moldability and various physical properties, the substrate layer 11 preferably contains a polyolefin-based resin. The polyolefin-based resin refers to a homopolymer of an olefin-based monomer and a copolymer containing a component derived from an olefin-based monomer. Examples of the olefin-based monomer include ethylene, propylene, butene, and pentene. The total content of polyolefin resin in the base layer 11 is not particularly limited. From the viewpoint of recyclability, the content of polyolefin resin in the base layer 11 is preferably 60 parts by mass or more, more preferably 80 parts by mass or more, and even more preferably 90 parts by mass or more, when the total content of the base layer 11 is 100 parts by mass. The upper limit of the content of the polyolefin resin may be 100 parts by mass. In this specification, "recyclability" means that scraps of the laminate sheet 10, used laminate sheet 10, etc. can be reused as a polyolefin resin raw material either directly or after appropriate processing.

[0013] The base layer 11 more preferably contains one or more resins selected from the group consisting of polypropylene-based resins, polyethylene-based resins (excluding EVA), and EVA. EVA is also known as ethylene-vinyl acetate copolymer. Since the base layer 11 is covered with the surface layer 13, it does not need to contain an ionomer from the viewpoints of cost and ensuring various physical properties.

[0014] The polypropylene resin is, for example, one or more selected from the group consisting of homopolypropylene, propylene-ethylene copolymer, and propylene-1-butene copolymer. From the viewpoint of impact resistance, the propylene-ethylene copolymer is preferably a block polypropylene. The polypropylene resin may be one type only, or two or more types may be used in combination. The melting point of the polypropylene-based resin is not particularly limited. The melting point of the polypropylene-based resin is preferably, for example, 150° C. to 165° C. The melting point of the polypropylene-based resin is measured by differential scanning calorimetry (DSC).

[0015] The polypropylene resin may contain recycled polypropylene in order to improve recycling efficiency by using recycled materials as the raw material for the laminate sheet 10. The content of recycled polypropylene in the base layer 11 is preferably 20 parts by mass or more, more preferably 30 parts by mass or more, and may be 40 parts by mass or more, 50 parts by mass or more, or 55 parts by mass or more, when the total amount of virgin polyolefin resin and recycled polypropylene is 100 parts by mass. The content of the recycled polypropylene may be 100 parts by mass or less, or may be 80 parts by mass or less, 70 parts by mass or less, or 65 parts by mass or less, in order to ensure the content of other polyolefin resins.

[0016] The polyethylene resin is, for example, one or more selected from the group consisting of low-density polyethylene, linear low-density polyethylene, medium-density polyethylene, high-density polyethylene, ethylene-α-olefin copolymer, ethylene-ethyl acrylate copolymer, and ethylene-methacrylate copolymer. Only one type of polyethylene resin may be used, or two or more types may be used in combination. The melting point of the polyethylene resin is not particularly limited. The melting point of the polyethylene resin is preferably, for example, 80° C. to 140° C. The melting point of the polyethylene resin is measured by differential scanning calorimetry (DSC). The density of the polyethylene resin is not particularly limited. The density of the polyethylene resin is preferably 0.88 g / cm. 3 -0.94g / cm 3 and more preferably 0.90 g / cm 3 -0.935g / cm 3 and more preferably 0.91 g / cm 3 -0.93g / cm 3 is.

[0017] EVA is a polymer containing structural units derived from ethylene and structural units derived from vinyl acetate in the molecule. The content of vinyl acetate in EVA is not particularly limited. From the viewpoint of improving flexibility, the content of vinyl acetate is preferably 5% by mass or more, and more preferably 10% by mass or more, when the mass of EVA is 100% by mass. From the viewpoint of various physical properties, the content of vinyl acetate is preferably 40% by mass or less, and more preferably 30% by mass or less. From these viewpoints, the content of vinyl acetate is preferably 5% by mass or more and 40% by mass or less, and more preferably 10% by mass or more and 30% by mass or less. The content of vinyl acetate is in accordance with JIS K 6924-1. Only one type of EVA may be used, or two or more types may be used in combination.

[0018] The content of each polyolefin resin in the base layer 11 is not particularly limited. From the viewpoint of mechanical strength, the content of the polypropylene resin is preferably 30 parts by mass or more, more preferably 45 parts by mass or more, and even more preferably 55 parts by mass or more, when the total amount of the polyolefin resin is 100 parts by mass. The content of the polypropylene resin may be 100 parts by mass, but from the viewpoint of ensuring the blending amount of other polyolefin resins, it is preferably 90 parts by mass or less, more preferably 80 parts by mass or less, and even more preferably 75 parts by mass or less. From these viewpoints, the content of the polypropylene resin is preferably 30 parts by mass or more and 90 parts by mass or less, more preferably 45 parts by mass or more and 80 parts by mass or less, and even more preferably 55 parts by mass or more and 75 parts by mass or more. From the viewpoint of moldability, the content of the polyethylene resin (excluding EVA) is preferably 5 parts by mass or more, more preferably 8 parts by mass or more, and even more preferably 10 parts by mass or more, based on 100 parts by mass of the total polyolefin resin. From the viewpoint of ensuring the blending amount of other polyolefin resins, the content of the polyethylene resin (excluding EVA) is preferably 30 parts by mass or less, more preferably 25 parts by mass or less, and even more preferably 20 parts by mass or less. From these viewpoints, the content of the polyethylene resin (excluding EVA) is preferably 5 parts by mass or more and 30 parts by mass or less, more preferably 8 parts by mass or more and 25 parts by mass or less, and even more preferably 10 parts by mass or more and 20 parts by mass or less. The EVA content may be 0 parts by mass, where the total polyolefin resin is 100 parts by mass, but from the viewpoint of improving adhesive strength, it is preferably 5 parts by mass or more, more preferably 10 parts by mass or more, and even more preferably 15 parts by mass or more. From the viewpoint of ensuring the blending amount of other polyolefin resins, the EVA content is preferably 50 parts by mass or less, more preferably 40 parts by mass or less, and even more preferably 35 parts by mass or less. From these viewpoints, the EVA content is preferably 5 parts by mass or more and 50 parts by mass or less, more preferably 10 parts by mass or more and 40 parts by mass or less, and even more preferably 15 parts by mass or more and 35 parts by mass or less.

[0019] The MFR of the substrate layer 11 is not particularly limited. The MFR of the substrate layer 11 (230°C, load 2.16 kg) is preferably 5 g / 10 min or less, more preferably 4 g / 10 min or less, and even more preferably 3 g / 10 min or less. The lower limit of the MFR of the substrate layer 11 is not particularly limited, and is, for example, 0.1 g / 10 min or more. The MFR of the substrate layer 11 can be measured, for example, in accordance with JIS K6921-1:2018.

[0020] The thickness of the base layer 11 can be set depending on the application, etc., and is not particularly limited. From the viewpoint of mechanical strength, the thickness of the base layer 11 is preferably 0.1 mm or more, more preferably 0.4 mm or more, and even more preferably 0.6 mm or more. From the viewpoint of formability, the thickness of the base layer 11 is preferably 10 mm or less, more preferably 5 mm or less, and even more preferably 3 mm or less. From these viewpoints, the thickness of the base layer 11 is preferably 0.1 mm or more and 10 mm or less, more preferably 0.4 mm or more and 5 mm or less, and even more preferably 0.6 mm or more and 3 mm or less.

[0021] (2) Surface layer 13 The surface layer 13 contains an ionomer whose metal ion is Zn. The ionomer whose metal ion is Zn is preferable in terms of the abrasion resistance of the surface layer 13. From the viewpoint of recyclability, the ionomer preferably contains an olefin-unsaturated carboxylic acid copolymer. The olefin is preferably an α-olefin. The olefin is, for example, one or more selected from the group consisting of ethylene, propylene, and butene-1. The unsaturated carboxylic acid is, for example, one or more selected from the group consisting of acrylic acid, methacrylic acid, maleic acid, fumaric acid, itaconic acid, maleic anhydride, itaconic anhydride, monomethyl maleate, and monoethyl maleate. Among these, acrylic acid or methacrylic acid is preferred. These unsaturated carboxylic acids may be used alone or in combination of two or more.

[0022] From the viewpoint of recyclability and moldability, the ionomer more preferably contains a copolymer of ethylene and acrylic acid and / or methacrylic acid. The ionomer may be a commercially available product, such as Himilan 1706 and Himilan AM7329 manufactured by Mitsui-Dow Polychemicals, or Surlyn 9945, Surlyn 9120, or Surlyn 9150 manufactured by Dow.

[0023] The surface layer 13 may contain only the ionomer, or may contain the ionomer and a thermoplastic resin (excluding the ionomer). The thermoplastic resin (excluding the ionomer) is preferably an olefin resin from the viewpoint of recyclability, and more preferably EVA from the viewpoints of recyclability and adhesive strength. The vinyl acetate content of the EVA is the same as that described in "(1) Base layer 11."

[0024] The content of the ionomer in the surface layer 13 is preferably 60 parts by mass or more, more preferably 70 parts by mass or more, and may be 80 parts by mass or more, 90 parts by mass or more, or 95 parts by mass or more, from the viewpoint of abrasion resistance, where the entire surface layer 13 is taken as 100 parts by mass. The upper limit of the content of the ionomer is, for example, 100 parts by mass. The content of EVA in the surface layer 13 may be 0 parts by mass, but from the viewpoint of adhesive strength, it is preferably 5 parts by mass or more, more preferably 10 parts by mass or more, and even more preferably 15 parts by mass or more, assuming that the entire surface layer 13 is 100 parts by mass. The upper limit of the EVA content is not particularly limited, and may be, for example, 40 parts by mass or less, 30 parts by mass or less, or 25 parts by mass or less.

[0025] The MFR of the surface layer 13 is not particularly limited. The MFR of the surface layer 13 (190°C, load 2.16 kg) is preferably 5 g / 10 min or less, more preferably 4 g / 10 min or less, and even more preferably 3 g / 10 min or less. The lower limit of the MFR of the surface layer 13 is not particularly limited, and is, for example, 0.1 g / 10 min or more. The MFR of the surface layer 13 can be measured, for example, in accordance with JIS K7210:1999.

[0026] From the viewpoint of abrasion resistance, the thickness of the surface layer 13 is 0.15 mm or more, preferably 0.2 mm or more, more preferably 0.25 mm or more, even more preferably 0.3 mm or more, and particularly preferably 0.35 mm or more. From the viewpoint of formability and cost, the thickness of the surface layer 13 is preferably 5 mm or less, more preferably 3 mm or less, even more preferably 2 mm or less, and particularly preferably 1 mm or less. From these viewpoints, the thickness of the surface layer 13 is 0.15 mm or more and 5 mm or less, preferably 0.2 mm or more and 5 mm or less, more preferably 0.25 mm or more and 3 mm or less, even more preferably 0.3 mm or more and 2 mm or less, and particularly preferably 0.35 mm or more and 1 mm or less.

[0027] (3) Configuration of the laminated sheet 10 The laminate sheet 10 has a Taber abrasion of 15 mg or less in the surface layer 13, measured in accordance with JIS K7204:1999 under conditions of an abrasion wheel CS-17, a rotation speed of 60 rpm, a rotation number of 1000, and an applied force of 9.8 N. The Taber abrasion of the surface layer 13 is preferably 10 mg or less, more preferably 8 mg or less, and even more preferably 5 mg or less. The lower limit of the Taber abrasion of the surface layer 13 may be 0 mg.

[0028] The maximum peel stress of the surface layer 13 is not particularly limited. The stress of the surface layer 13 can be appropriately set depending on the application, etc. The maximum peel stress of the surface layer 13 measured by a T-peel test (JIS K 6854-3:1999) may be 0 N, preferably 0.1 N or more, more preferably 0.4 N or more, and even more preferably 1 N or more. The maximum peel stress of the surface layer 13 is usually 50 N or less. The T-peel test (JIS K 6854-3:1999) is performed by cutting a 25 mm wide test piece from the laminate sheet 10. The maximum peel stress is the maximum value of the peel stress when the base layer 11 and the surface layer 13 are peeled off at a test speed of 100 mm / min and a test environment temperature of 23°C.

[0029] In order to ensure the maximum peel stress, it is preferable that both the base layer 11 and the surface layer 13 of the laminate sheet 10 contain ethylene vinyl acetate copolymer. Furthermore, from the viewpoint of ensuring the maximum peel stress, it is preferable that at least one of the base material layer 11 and the surface layer 13 has an uneven shape on the lamination surface. The uneven shape is a shape imparted by, for example, graining or embossing. The lamination surface of the base material layer 11 is the surface on which the surface layer 13 is laminated. The lamination surface of the surface layer 13 is the surface on which the base material layer 11 is laminated.

[0030] From the viewpoint of recyclability, the laminate sheet 10 is preferably a laminate sheet whose main component is a polyolefin-based resin. The content of the polyolefin-based resin in the laminate sheet 10 is preferably 80 parts by mass or more, more preferably 90 parts by mass or more, and even more preferably 95 parts by mass or more, assuming that the entire laminate sheet 10 is 100 parts by mass. The upper limit of the content of the polyolefin-based resin is not particularly limited and may be 100 parts by mass. In other words, the laminate sheet 10 is preferably composed only of a polyolefin-based resin.

[0031] The use of the laminate sheet 10 is not particularly limited. Because the laminate sheet 10 is abrasion resistant, it is suitable for various applications requiring abrasion resistance. The present disclosure is suitable, for example, as a component transport member including the laminate sheet 10. The form of the component transport member is not particularly limited. The component transport member may be, for example, any of a component transport packaging material, a component transport tray, and a component transport case. The component transport member may have a surface that comes into contact with the component formed by a surface layer 13. The type of component to be transported is not particularly limited, and examples include various metal components, electronic components, etc. The present disclosure is also suitable, for example, as a vehicle interior material including the laminate sheet 10.

[0032] The laminate sheet 10 may be used as is or may be molded before use. From the viewpoint of moldability, the laminate sheet 10 is suitable as a laminate sheet for molding, and is particularly suitable as a laminate sheet for vacuum molding. The technology of the present disclosure also encompasses a molded product configured with the above-mentioned laminate sheet 10.

[0033] 2. Manufacturing method of laminated sheet 10 The method for manufacturing the laminate sheet 10 is not particularly limited. For example, a coextrusion T-die melt extrusion method can be used to manufacture the laminate sheet 10. Specifically, the raw materials for the base layer 11 and the surface layer 13 are melt-kneaded using separate extruders. The melt-kneaded resin is extruded in a layered state from a single T-die connected to each extruder, and then cooled to obtain the laminate sheet 10. The laminate sheet 10 thus obtained has the base layer 11 and the surface layer 13 fused together. Therefore, even if the laminate sheet 10 does not have an adhesive layer, the adhesive strength can be suitably improved. Furthermore, since the laminate sheet 10 does not have an adhesive layer between the base layer 11 and the surface layer 13, it is easier to manufacture using a coextrusion T-die melt extrusion method than a multilayer sheet having an adhesive layer.

[0034] In addition to the coextrusion T-die melt extrusion method, the extrusion lamination method may also be used to manufacture the laminate sheet 10. Specifically, the raw materials for the surface layer 13 are melt-kneaded using an extruder and extruded into a sheet to prepare the sheet-shaped surface layer 13. At this time, the extruded sheet-shaped surface layer 13 may be passed through an embossing roll having an uneven pattern on the roll surface to impart an uneven shape to the lamination surface. The raw materials for the base layer 11 are melt-kneaded using an extruder, extruded into a sheet, and directly laminated to the surface of the surface layer 13, followed by cooling to obtain the laminate sheet 10.

[0035] 3. Effects of this embodiment Conventionally, a technique for using a thermoplastic polyurethane elastomer in a surface layer to improve the abrasion resistance of a sheet surface has been known. When a thermoplastic polyurethane elastomer is used in the surface layer, an adhesive layer is generally provided between the base layer and the surface layer to ensure adhesive strength between the base layer and the surface layer. In the laminated sheet 10 of this embodiment, by using an ionomer for the surface layer 13 and making the thickness of the surface layer 13 a predetermined value or more, the substrate layer 11 and the surface layer 13 can be bonded together without an adhesive layer while ensuring sufficient abrasion resistance.

[0036] Furthermore, the laminate sheet 10 of this embodiment uses an ionomer for the surface layer 13, and does not have an adhesive layer interposed therebetween. Therefore, by appropriately selecting the type of resin used for the surface layer 13 and the base layer 11, the proportion of polyolefin resin in the entire laminate sheet 10 can be suitably increased, making it easier to reuse the laminate sheet 10 as a recycled material. [Example]

[0037] The present invention will be explained in more detail below with reference to examples.

[0038] 1. Preparation of Laminated Sheets The laminated sheets of Examples 1 to 12 and Comparative Example 1 were produced using the blending ratios shown in Tables 1 and 2. Details of the main raw materials listed in Tables 1 and 2 are shown below. <Base material layer> Polyolefin resin 1: Polypropylene resin (homopolypropylene), MFR 0.5g / 10min (230℃, 2.16kg), density 0.90g / cm 3 Polyolefin resin 2: Polypropylene resin (recycled polypropylene), MFR 1.00g / 10min (230℃, 2.16kg), density 0.90g / cm 3 , manufactured by Asahi Chemical Industry Co., Ltd. Polyolefin resin 3: Polypropylene resin (recycled polypropylene), MFR 0.98g / 10min (230℃, 2.16kg), density 0.90g / cm 3 , manufactured by Yamashita Chemical Co., Ltd. Polyolefin resin 4: Polyethylene resin (low density polyethylene), MFR 0.30 g / 10 min (190°C, 2.16 kg), density 0.920 g / cm 3 Polyolefin resin 5: EVA (vinyl acetate content 19% by mass), density 0.93 g / cm 3 -0.98g / cm 3 Polyolefin resin 6: Polyethylene resin (low-density polyethylene) Polyolefin resin 7: Polypropylene resin (homopolypropylene), MFR 0.5g / 10min (230℃, 2.16kg), density 0.90g / cm 3

[0039] <Adhesive layer> Polyolefin resin 8: Polypropylene resin (homopolypropylene), MFR 0.5g / 10min (230℃, 2.16kg), density 0.90g / cm 3 Styrene-based resin 1: Hydrogenated styrenic thermoplastic elastomer (SEBS), MFR 4.0 g / 10 min (230°C, 2.16 kg)

[0040] <Surface layer> Ionomer: Ethylene-methacrylic acid copolymer and zinc ion-containing ionomer, MFR 0.9g / 10min (190℃, 2.16kg), density 0.960g / cm 3, Himilan 1706, manufactured by Mitsui Dow Polychemicals Co., Ltd. Polyolefin resin 9: EVA (vinyl acetate content 19% by mass), density 0.93 g / cm 3 -0.98g / cm 3 Polyurethane resin: Thermoplastic polyurethane elastomer (TPU) Styrene-based resin 2: Hydrogenated styrene-based thermoplastic elastomer (SEBS)

[0041] Among the above raw materials, polyolefin resins 2 and 3 are recycled polyolefins, and the other polyolefin resins are all virgin polyolefin resins.

[0042] [Table 1]

[0043] [Table 2]

[0044] (1) Examples 1, 3, 5, 7, 9, and 11 The raw materials for the surface layer were melt-kneaded using an extruder. The cylinder temperature of the extruder used to melt-knead the raw materials for the surface layer was set to 190°C. The raw materials for the surface layer were extruded into a sheet and passed through a mirror-finish roll having a mirror-finish roll surface to prepare a sheet-like surface layer. In other words, no uneven shape (grain shape) was imparted to the laminated surface of the surface layer. The thickness of the surface layer was adjusted to the dimensions listed in Tables 1 and 2. The raw materials for the base layer were melt-kneaded using an extruder. The cylinder temperature of the extruder used to melt-knead the raw materials for the base layer was set to 230°C. The raw materials for the base layer were extruded into a sheet, directly attached to the lamination surface of the surface layer, and cooled by passing through a cooling roll. The thickness of the base layer was adjusted to the dimensions listed in Tables 1 and 2. In this manner, laminate sheets of Examples 1, 3, 5, 7, 9 and 11 were obtained.

[0045] (2) Examples 2, 4, 6, 8, 10, and 12 The raw materials for the surface layer were melt-kneaded using an extruder. The cylinder temperature of the extruder used to melt-knead the raw materials for the surface layer was set to 190°C. The raw materials for the surface layer were extruded into a sheet and passed through an embossing roll having a textured pattern (embossed pattern) on the roll surface to prepare a sheet-like surface layer. In other words, a textured shape (embossed pattern) was imparted to the laminated surface of the surface layer. The thickness of the surface layer was adjusted to the dimensions listed in Tables 1 and 2. The raw materials for the base layer were melt-kneaded using an extruder. The cylinder temperature of the extruder used to melt-knead the raw materials for the base layer was set to 230°C. The raw materials for the base layer were extruded into a sheet, directly attached to the lamination surface of the surface layer, and cooled by passing through a cooling roll. The thickness of the base layer was adjusted to the dimensions listed in Tables 1 and 2. In this manner, laminate sheets of Examples 2, 4, 6, 8, 10 and 12 were obtained.

[0046] (3) Comparative Example 1 The raw materials for the surface layer, adhesive layer, and base layer were each prepared by the following method. Next, each of the raw materials was fed into a different extruder (Hitachi Zosen, screw diameter φ100, and IKG, screw diameter φ65), and extruded while gradually increasing the temperature from approximately 130°C. The extruded raw materials for each layer were merged in a feed block installed immediately before the T-die and then fed into the T-die. They were expanded in width by a single manifold within the T-die at approximately 190°C-220°C, obtaining a multilayer sheet in which the base layer and surface layer were bonded by an adhesive layer. The thickness of each layer was adjusted to the dimensions listed in Table 2. In this manner, the laminate sheet of Comparative Example 1 was obtained.

[0047] 2. Evaluation Method (1) Taber abrasion A 100 mm x 100 mm sample was obtained from the laminate sheet of each Example and Comparative Example. For each sample, the Taber abrasion of the surface layer was measured in accordance with JIS K7204:1999 using an abrasion wheel CS-17 (manufactured by Taber Industries) at a rotation speed of 60 rpm, 1000 rotations, and an applied force of 9.8 N. During the measurement, refacing was performed using an abrasion wheel S-11 (manufactured by Taber Industries) at a rotation speed of 60 rpm, 50 rotations, and an applied force of 9.8 N.

[0048] The abrasion resistance was evaluated according to the following criteria: the smaller the Taber abrasion amount, the better the abrasion resistance. A: Taber abrasion is 5 mg or less. B: Taber abrasion amount is more than 5 mg and 10 mg or less. C: Taber abrasion amount is more than 10 mg and 15 mg or less. D: Taber abrasion amount exceeds 15 mg.

[0049] (2) MFR The MFR of the surface layer of each example and comparative example was measured in accordance with JIS K7210:1999 at 190°C under a load of 2.16 kg, and a value of 0.1 g / 10 min or more and 3.0 g / 10 min or less was rated as "good." The MFR of the substrate layer of each example and comparative example was measured in accordance with JIS K6921-1:2018 at 230°C and a load of 2.16 kg, and a value of 0.1 g / 10 min or more and 3.0 g / 10 min or less was rated as "suitable." If MFR was not measured, it was marked as "-".

[0050] (3) Vacuum formability A 200 mm × 200 mm sample was obtained from each laminate sheet of each Example and Comparative Example. Each sample was vacuum-formed using a simple vacuum forming machine (manufactured by Formech International Limited, product name "Compac Mini"). Specifically, the sample was heated from both the front and back sides using a far-infrared heating device until the surface temperature reached approximately 150°C. The heated sample was placed in a mold heated to 80°C, and the air pressure was reduced using a vacuum pump to 0.01 mPa or less so that the sample adhered tightly to the mold. After 10 seconds, the sample was removed from the mold to obtain a vacuum-formed molded product. The laminate sheets were evaluated according to the following criteria. Good: No tears or other damage were observed and vacuum forming is possible. Acceptable: There are tears, but vacuum forming is possible. Not possible: Vacuum forming is not possible.

[0051] (4) Recyclability The suitability of the laminated sheet for recycling as a raw material for polyolefin resin was evaluated according to the following criteria. Suitable: The content of polyolefin resin (including ionomer) in the laminate sheet is 80 parts by mass or more, with the entire laminate sheet being 100 parts by mass. Unsuitable: The content of polyolefin resin (including ionomer) in the laminate sheet is less than 80 parts by mass, with the entire laminate sheet being taken as 100 parts by mass.

[0052] 3.Results The results are shown in Tables 1 and 2. (1) Fulfillment of each requirement in Examples 1-12 and Comparative Examples The laminate sheets of Examples 1-12 satisfy all of the following requirements (a)-(d). In contrast, the laminate sheet of Comparative Example 1 does not satisfy requirements (a) and (b). Requirement (a): A laminated sheet having a base layer and a surface layer directly laminated on the base layer. Requirement (b): The surface layer contains an ionomer in which the metal ion is Zn. Requirement (c): The thickness of the surface layer is 0.15 mm or more. Requirement (d): The Taber abrasion of the surface layer is 15 mg or less, measured in accordance with JIS K7204:1999 using a CS-17 abrasive wheel at a rotation speed of 60 rpm, 1000 revolutions per minute, and an applied force of 9.8 N.

[0053] Furthermore, among Examples 1 to 12, the laminate sheets of Examples 3 to 6 and 9 to 12 also satisfy the following requirements. Requirement (e): Both the base layer and the surface layer contain ethylene vinyl acetate copolymer.

[0054] Furthermore, among Examples 1 to 12, the laminate sheets of Examples 2, 4, 6, 8, 10, and 12 also satisfy the following requirements. Requirement (f): At least one of the base layer and the surface layer has an uneven surface on the lamination surface.

[0055] (2) Consideration The laminate sheets of Examples 1-12 were able to achieve sufficient abrasion resistance, either equal to or better than that of Comparative Example 1, while omitting the adhesive layer between the abrasion-resistant layer and the base layer, although it was inferior to that of Comparative Example 1. Since the laminate sheets of Examples 1-12 are composed only of polyolefin resins (including ionomers), they can be suitably recycled as polyolefin resin raw materials. On the other hand, Comparative Example 1 is not suitable for recycling as a polyolefin resin raw material because raw materials other than polyolefin resins are used for the surface layer and adhesive layer.

[0056] Furthermore, examples (e.g., Example 1 and Example 2) in which the surface layer and base layer have the same composition and thickness but differ in the presence or absence of an uneven surface are compared. Comparison of examples in which the surface layer and base layer have the same composition and thickness but differ in the presence or absence of an uneven surface suggests that satisfying requirement (e) can further improve adhesive strength. Furthermore, a comparison between Example 1 and Example 3, and a comparison between Example 7 and Example 9 suggests that the adhesive strength can be further improved by satisfying requirement (f).

[0057] The results of the above examples and comparative examples also suggest that the higher the ionomer content in the surface layer and the thicker the surface layer, the better the abrasion resistance. On the other hand, it was found that the higher the ionomer content in the surface layer, the lower the adhesive strength. Furthermore, it was found that the higher the EVA content in the surface layer, the lower the abrasion resistance, but the higher the adhesive strength. Therefore, the following inventions can also be understood from this disclosure. A laminated sheet having a base layer and a surface layer directly laminated on the base layer, the surface layer contains an ionomer in which the metal ion is Zn; The content of the ionomer in the surface layer is 85 parts by mass or more, where the entire surface layer is 100 parts by mass, The thickness of the surface layer is 0.15 mm or more, A laminated sheet, wherein the Taber abrasion amount of the surface layer is 10 mg or less, measured in accordance with JIS K7204:1999 under conditions of an abrasion wheel CS-17, a rotation speed of 60 rpm, a rotation number of 1000, and an applied force of 9.8 N. A laminated sheet having a base layer and a surface layer directly laminated on the base layer, the surface layer contains an ionomer in which the metal ion is Zn and EVA; The thickness of the surface layer is 0.35 mm or more, A laminated sheet, wherein the Taber abrasion amount of the surface layer is 10 mg or less, measured in accordance with JIS K7204:1999 under conditions of an abrasion wheel CS-17, a rotation speed of 60 rpm, a rotation number of 1000, and an applied force of 9.8 N.

[0058] 4. Effects of the Example According to the above-described embodiments, a laminated sheet having sufficient abrasion resistance can be provided while omitting an adhesive layer between the surface layer and the base layer.

[0059] The present disclosure is not limited to the above-described embodiments, and various modifications and variations are possible. [Explanation of symbols]

[0060] 10...Laminated sheet 11...Base material layer 13…Surface layer

Claims

1. A laminated sheet having a base layer and a surface layer directly laminated on the base layer, the surface layer contains an ionomer in which the metal ion is Zn; The thickness of the surface layer is 0.15 mm or more, A laminated sheet, wherein the Taber abrasion amount of the surface layer is 15 mg or less, as measured in accordance with JIS K7204:1999 under conditions of an abrasion wheel CS-17, a rotation speed of 60 rpm, a rotation number of 1000, and an applied force of 9.8 N.

2. The laminate sheet according to claim 1 , wherein both the base layer and the surface layer contain an ethylene vinyl acetate copolymer.

3. The laminate sheet according to claim 1 , wherein at least one of the base layer and the surface layer has an uneven surface on the lamination surface.

4. A component transport member comprising the laminated sheet according to any one of claims 1 to 3.

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