Multilayer sheet and method for producing multilayer sheet

Abstract

To provide a multilayer sheet that maintains the characteristics of a resin sheet composed of a 4-methyl-1-pentene-based copolymer while exhibiting excellent elongation and resistance to breakage.SOLUTION: The multilayer sheet of the present invention comprises a first layer forming one surface of the multilayer sheet, the first layer being a non-foamed layer containing a 4-methyl-1-pentene-based copolymer (A), and a second layer containing the 4-methyl-1-pentene-based copolymer (A), the first and second layers being laminated. The 4-methyl-1-pentene-based copolymer (A) includes structural units derived from 4-methyl-1-pentene and structural units derived from a linear α-olefin having 2 to 3 carbon atoms.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a multilayer sheet and a method for manufacturing the multilayer sheet, and more particularly to a multilayer sheet, a roll body, a dough-laminated sheet, and a method for manufacturing the multilayer sheet. [Background technology]

[0002] Resin sheets using 4-methyl-1-pentene polymers containing 4-methyl-1-pentene as the main constituent monomer are known to have excellent flexibility, stress relaxation properties, appropriate adhesiveness, etc. In recent years, there has been increasing expectation for the use of such resin sheets using 4-methyl-1-pentene polymers in various fields.

[0003] For example, Patent Document 1 (WO 2018 / 143411) discloses the use of a foamed sheet of a 4-methyl-1-pentene polymer to improve the balance of flexibility, shape retention, and shape conformability while maintaining light weight. Furthermore, Patent Document 2 (WO 2022 / 202622) discloses a resin sheet made of a composition containing a 4-methyl-1-pentene polymer and a silylated polyolefin to suppress blocking between sheets.

[0004] Furthermore, Patent Document 3 (JP 2019-214211 A) discloses a structured sheet body in which a surface layer containing a thermoplastic elastomer is laminated onto a core layer containing a 4-methyl-1-pentene polymer in order to obtain elasticity in addition to the stress relaxation properties of a resin sheet using a 4-methyl-1-pentene polymer. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] International Publication No. 2018 / 143411 [Patent Document 2] International Publication No. 2022 / 202622 [Patent Document 3] Japanese Patent Application Publication No. 2019-214211 Summary of the Invention [Problem to be solved by the invention]

[0006] However, conventional single-layer resin sheets using 4-methyl-1-pentene copolymers as disclosed in Patent Documents 1 and 2 were prone to tearing due to stretching. In particular, the resin sheet of Patent Document 1 was prone to breakage originating from foamed portions. Furthermore, the laminate sheet of Patent Document 3 has a surface layer containing a thermoplastic elastomer, and therefore is not sufficient in terms of maintaining the properties of a resin sheet using a 4-methyl-1-pentene copolymer. As described above, Patent Documents 1 to 3 have room for improvement in terms of achieving both good extensibility and good break resistance while maintaining the properties of the resin sheet using the 4-methyl-1-pentene copolymer. [Means for solving the problem]

[0007] The present inventors have conducted studies to achieve both good extensibility and break resistance while maintaining the properties of a resin sheet using a 4-methyl-1-pentene copolymer, and have newly focused on laminating a non-foamed sheet containing a 4-methyl-1-pentene copolymer onto a foamed sheet containing a 4-methyl-1-pentene copolymer. As a result of further studies, they have found that it is effective to use the non-foamed sheet as a surface layer, and have completed the present invention.

[0008] That is, according to the present invention, the following multilayer sheet and related techniques are provided.

[0009] [1] A first layer which is a non-foamed layer constituting one surface and containing a 4-methyl-1-pentene copolymer (A); a second layer containing a 4-methyl-1-pentene copolymer (A); A multilayer sheet in which A multilayer sheet in which the 4-methyl-1-pentene copolymer (A) contains structural units derived from 4-methyl-1-pentene and structural units derived from a linear α-olefin having 2 to 3 carbon atoms. [2] The multilayer sheet according to [1], The second layer has a relatively lower specific gravity than the first layer. [3] The multilayer sheet according to [1] or [2], The multilayer sheet, wherein the second layer is a foam layer. [4] A multilayer sheet according to any one of [1] to [3], A multilayer sheet in which the loss tangent (tanδ) measured by dynamic viscoelasticity measurement under conditions of a heating rate of 4°C / min, a frequency of 1.59 Hz, and a strain of 0.1% has one or more temperatures in the range of 10°C to 100°C, inclusive, showing a maximum value, and the maximum value of the loss tangent is 0.5 to 3.5, inclusive. [5] A multilayer sheet according to any one of [1] to [4], A multilayer sheet comprising the first layer on both sides of the multilayer sheet. [6] A multilayer sheet according to any one of [1] to [5], A multilayer sheet in which the first layer and the second layer are in contact with each other at least in part. [7] The multilayer sheet according to any one of [1] to [6], A multilayer sheet, wherein the ratio of the total layer thickness (μm) of the second layer to the total layer thickness (μm) of the first layer (second layer thickness / first layer thickness) is 0.05 to 5. [8] A multilayer sheet according to any one of [1] to [7], A multilayer sheet, wherein the first layer contains one or two selected from a styrene-based copolymer (B) and a silicone-based copolymer (C). [9] A multilayer sheet according to any one of [1] to [8], The multilayer sheet, wherein the second layer contains a styrene copolymer (B).

[10] The multilayer sheet according to any one of [1] to [9], A multilayer sheet having a breaking stress in the MD direction of 4 to 20 MPa and a tensile breaking elongation of 300 to 1000% when stretched at a tensile speed of 300 mm / min in accordance with JIS K7127.

[11] The multilayer sheet according to any one of [1] to

[10] , The multilayer sheet is a coextruded multilayer sheet.

[12] The multilayer sheet according to any one of [1] to

[11] , The multilayer sheet has a specific gravity of 0.50 to 0.90.

[13] The multilayer sheet according to any one of [1] to

[12] , the second layer contains a 4-methyl-1-pentene copolymer (A) and a thermal decomposition type chemical foaming agent, A multilayer sheet, comprising 1 to 15 parts by weight of a thermally decomposable chemical foaming agent based on 100 parts by weight of a 4-methyl-1-pentene copolymer (A).

[14] The multilayer sheet according to any one of [1] to

[13] , The second layer has an average thickness of 50 to 1000 μm.

[15] The multilayer sheet according to any one of [1] to

[14] , The multilayer sheet, wherein the first layer further comprises an antiblocking agent.

[16] A multilayer sheet according to any one of [1] to

[15] , which is used for hygiene products, clothing, or a part of clothing.

[17] A roll body in which the multilayer sheet according to any one of [1] to

[16] is wound around a core.

[18] A fabric laminated sheet obtained by thermocompression bonding the multilayer sheet according to any one of [1] to

[16] and fabric.

[19] A method for producing a multilayer sheet according to any one of [1] to

[16] , A method for producing a multilayer sheet, comprising a step of co-extruding and laminating a first resin composition for forming the first layer and a second resin composition for forming the second layer.

[20] A method for producing the multilayer sheet according to

[19] , The method for producing a multilayer sheet, wherein in the laminating step, the second resin composition is co-extruded and foamed.

[21] A method for producing a multilayer sheet according to

[19] or

[20] , The second resin composition contains a thermally decomposable chemical foaming agent, and the second resin composition contains 1 to 15 parts by weight of a pre-thermal decomposition type chemical foaming agent per 100 parts by weight of the 4-methyl-1-pentene copolymer (A) in the second resin composition. [Effects of the Invention]

[0010] According to the present invention, it is possible to provide a multilayer sheet that can achieve good extensibility and break resistance while maintaining the properties of a resin sheet using a 4-methyl-1-pentene copolymer, and a technique related thereto. DETAILED DESCRIPTION OF THE INVENTION

[0011] In this specification, unless otherwise specified, the expression "a to b" in the description of a numerical range means from a to b. For example, "1 to 5 mass %" means "1 mass % to 5 mass %."

[0012] In this specification, MD direction refers to the machine direction and indicates the direction in which a resin or sheet flows, and TD direction refers to the transverse direction and indicates the direction perpendicular to the flow direction.

[0013] In this specification, specific gravity is measured in accordance with ASTM D 1505 (water displacement method).

[0014] 1. Multi-layer sheet The multilayer sheet of the present embodiment comprises a first layer, which constitutes one surface of the multilayer sheet and is a non-foamed layer containing a 4-methyl-1-pentene copolymer (A), and a second layer, which also contains a 4-methyl-1-pentene copolymer (A), wherein the 4-methyl-1-pentene copolymer (A) contains a structural unit derived from 4-methyl-1-pentene and a structural unit derived from a linear α-olefin having 2 to 3 carbon atoms. This makes it possible to achieve both good extensibility and break resistance while maintaining the properties of the resin sheet using the 4-methyl-1-pentene copolymer (A). That is, by laminating multiple resin sheets using the 4-methyl-1-pentene copolymer (A), the strength of the entire sheet can be improved, and by providing a non-foamed layer on the surface, breakage of the entire sheet can be suppressed even if breakage occurs inside.

[0015] (loss tangent (tanδ)) The multilayer sheet of this embodiment preferably has at least one maximum temperature in the range of 10°C to 100°C in terms of loss tangent (tanδ) as determined by dynamic viscoelasticity measurement under conditions of a heating rate of 4°C / min, a frequency of 1.59 Hz, and a strain of 0.1%, and the maximum value of the loss tangent (tanδ) is 0.5 to 3.5. This makes it easier to obtain flexibility, shape conformability, and shape retention when using the multilayer sheet of this embodiment.

[0016] Furthermore, the temperature at which the loss tangent (tan δ) shows a maximum value is preferably in the range of 10° C. or higher and 100° C. or lower, more preferably in the range of 15° C. or higher and 60° C. or lower, and even more preferably in the range of 20° C. or higher and 40° C. By setting the temperature within the above range, it becomes easier to improve the flexibility, shape conformability, and shape retention properties of the multilayer sheet simply by warming it by contacting it with body heat.

[0017] The maximum value of the loss tangent (tan δ) is preferably 0.8 or more, more preferably 1.0 or more, and even more preferably 1.3 or more. Here, the loss tangent (tan δ) is known as an index of viscoelasticity, and can be used to evaluate the property of being resistant to deformation by a fast force but deforming by a slow force. Therefore, by setting the maximum value of the loss tangent (tanδ) to the above lower limit or more, it becomes easier to improve the followability to a slow force, while by setting the maximum value of the loss tangent (tanδ) to the above upper limit or less, it becomes easier to improve the fixing force to a fast force. As a result, when using the multilayer sheet, the sheet can be made to conform by slowly applying force to it, and even if a rapid force is applied to it, deformation is suppressed and the desired shape is maintained.

[0018] (Tensile properties) The multilayer sheet of this embodiment preferably has a breaking stress in the MD direction of 4 to 20 MPa and a tensile breaking elongation of 300 to 1000% when stretched at a tensile speed of 300 mm / min in accordance with JIS K7127. The stress at break is preferably 4.2 MPa or more, more preferably 4.5 MPa or more, and even more preferably 4.8 MPa or more, which can improve the break resistance. On the other hand, the stress at break is preferably 18 MPa or less, more preferably 15 MPa or less, and even more preferably 12 MPa or less, which allows for both good elongation and good resistance to breakage.

[0019] The tensile elongation at break is preferably 330% or more, and more preferably 350% or more, which can improve the extensibility. On the other hand, the tensile elongation at break is preferably 900% or less, more preferably 800% or less, and even more preferably 750% or less, which allows for both good extensibility and good resistance to breakage.

[0020] (specific gravity) The multilayer sheet of the present embodiment has a viscosity of preferably 0.50 to 0.90, more preferably 0.51 to 0.88, more preferably 0.52 to 0.85, and even more preferably 0.52 to 0.83. By setting the specific gravity to the above lower limit or more, good elongation and break resistance are likely to be obtained. On the other hand, by setting the specific gravity to the above upper limit or less, it is possible to further reduce the weight while maintaining good elongation and breakage resistance.

[0021] (Thickness) The average thickness of the multilayer sheet is not particularly limited, but is preferably in the range of 0.1 mm to 10 mm, more preferably 0.2 mm to 5 mm, and even more preferably 0.3 mm to 3 mm. By setting the average thickness of the multilayer sheet to the above lower limit or more, the multilayer sheet can be made easy to handle when picked up, while improving mechanical strength and widening the degree of freedom in design. On the other hand, by setting the average thickness of the multilayer sheet to the above upper limit or less, the multilayer sheet can be made more flexible and lighter in weight while maintaining good handleability and mechanical strength.

[0022] In the multilayer sheet of this embodiment, the ratio of the total layer thickness (μm) of the second layers to the total layer thickness (μm) of the first layers (second layer thickness / first layer thickness) is preferably 0.05 to 5, more preferably 0.1 to 2. This allows for both good extensibility and break resistance to be achieved at a higher level.

[0023] (Layer composition) The multilayer sheet of this embodiment is a multilayer sheet having at least a first layer and a second layer. It is preferable that the first layer and the second layer are in contact with each other in part or in whole. Since both the first layer and the second layer contain the 4-methyl-1-pentene copolymer (A), good interlayer adhesion can be obtained. Furthermore, each of the first layer and the second layer may be one layer or two or more layers. Furthermore, the term "multilayer" means that there is an interface between the layers. That is, examples include a multilayer formed by separately kneading the first resin composition and the second resin composition constituting the first layer and the second layer and co-extruding them, a multilayer formed by forming the first layer and then coating the second resin composition on the first layer to form the second layer, a multilayer formed by forming the second layer and then coating the first resin composition on the second layer to form the first layer, and a multilayer formed by forming the first layer and then coating the first resin composition on the second layer, and a multilayer formed by forming the first layer and the second layer separately and then bonding them together. Furthermore, it is preferable that the MD and TD directions of each layer of the multilayer sheet are aligned, which makes it easier to control the appearance of the sheet, such as deformation and elongation.

[0024] (form) The multilayer sheet of this embodiment is preferably a coextruded multilayer sheet.

[0025] Next, each layer constituting the multilayer sheet will be described.

[0026] <1st layer> The first layer is a non-foamed layer that constitutes one surface of the multilayer sheet and contains a 4-methyl-1-pentene copolymer (A). This allows the multilayer sheet to have improved tensile strength while still retaining the properties of a resin sheet that uses a 4-methyl-1-pentene copolymer. Furthermore, the presence of a non-foamed layer on the surface provides a smooth feel.

[0027] The first layer may constitute both surfaces of the multilayer sheet. That is, the outermost surface of the multilayer sheet may be constituted by the first layer. This allows the first layers to come into contact with each other when the multilayer sheet is rolled up and stored, thereby effectively suppressing blocking. For example, a multi-layer sheet may have a first layer as the outermost surface and a second layer as the middle layer.

[0028] Furthermore, the first layer may be two or more layers. This can further improve the tensile break resistance of the multilayer sheet. When there are multiple first layers, the first layers may be laminated continuously or with other layers interposed therebetween. It is also preferable that the first resin compositions constituting the first layers have the same composition.

[0029] In this embodiment, the non-foamed layer refers to a layer that does not have many bubbles or cavities within the layer. The bubbles may be single or continuous. Furthermore, the first layer is produced without a foaming step. The specific gravity of the first layer is preferably 0.55 to 0.98, more preferably 0.60 to 0.95, and even more preferably 0.65 to 0.90. Furthermore, the first layer preferably has a relatively higher specific gravity than the second layer. Specifically, the specific gravity (ratio) of the first layer to the specific gravity of the second layer is preferably 55 to 85%, and more preferably 57 to 80%.

[0030] The average thickness of the first layer is not particularly limited, but is preferably in the range of 0.1 mm to 10 mm, more preferably 0.2 mm to 5 mm, and even more preferably 0.3 mm to 3 mm.

[0031] <First resin composition> The first layer is formed from a first resin composition. The first resin composition contains at least a 4-methyl-1-pentene copolymer (A). The first resin composition may contain two or more different types of 4-methyl-1-pentene copolymers (A). Examples of different types of 4-methyl-1-pentene copolymers (A) include those that differ in the ratio of the 4-methyl-1-pentene-derived structural unit (a1) constituting the 4-methyl-1-pentene copolymer (A) described below and the structural unit (a2) derived from an α-olefin having 2 to 3 carbon atoms other than 4-methyl-1-pentene.

[0032] [4-methyl-1-pentene polymer (A)] The 4-methyl-1-pentene polymer (A) contains a structural unit (a1) derived from 4-methyl-1-pentene and a structural unit (a2) derived from an α-olefin having 2 to 3 carbon atoms other than 4-methyl-1-pentene.

[0033] In order to improve the flexibility of the multilayer sheet and obtain good adhesiveness, the 4-methyl-1-pentene polymer (A) according to this embodiment preferably contains the structural unit (a1) in an amount of 10 mol % to 90 mol % and the structural unit (a2) in an amount of 10 mol % to 90 mol %, when the total of the structural unit (a1) and the structural unit (a2) is taken as 100 mol %. Furthermore, from the viewpoint of improving the flexibility and mechanical properties of the multilayer sheet, when the total of the structural units (a1) and (a2) is taken as 100 mol%, the 4-methyl-1-pentene polymer (A) according to this embodiment preferably contains 30 mol% or more and 90 mol% or less of the structural unit (a1) and 10 mol% or less of the structural unit (a2); more preferably contains 50 mol% or more and 90 mol% or less of the structural unit (a2); and even more preferably contains 10 mol% or more and 50 mol% or less of the structural unit (a1). It is even more preferable that the content of the structural unit (a1) is 60 mol% or more and 90 mol% or less of the structural unit (a2) and 10 mol% or more and 40 mol% or less of the structural unit (a2). It is particularly preferable that the content of the structural unit (a1) is 65 mol% or more and 90 mol% or less of the structural unit (a2) and 10 mol% or more and 35 mol% or less.

[0034] Furthermore, when the first resin composition contains two or more different types of 4-methyl-1-pentene copolymers (A), the first resin composition may contain a 4-methyl-1-pentene copolymer (A1) having a structural unit (a1) content of 65 mol% or more and 80 mol% or less and a structural unit (a2) content of 20 mol% or more and 35 mol% or less, and a 4-methyl-1-pentene copolymer (A2) having a structural unit (a1) content of more than 80 mol% and 90 mol% or less and a structural unit (a2) content of 10 mol% or more and less than 20 mol%.

[0035] Examples of the structural unit (a2) derived from a linear α-olefin having 2 to 3 carbon atoms include ethylene and propylene, with propylene being preferred among these because it provides flexibility while maintaining mechanical strength.

[0036] The 4-methyl-1-pentene polymer (A) may contain structural units other than the structural units (a1) and (a2) as long as the object of the present invention is not impaired. Examples of other structural units include structural units derived from non-conjugated polyenes. Examples of non-conjugated polyenes include linear, branched, or cyclic dienes, various norbornenes, and norbornadienes, each having preferably 5 to 20 carbon atoms, more preferably 5 to 10 carbon atoms. Among these, 5-vinylidene-2-norbornene and 5-ethylidene-2-norbornene are preferred.

[0037] The content of the 4-methyl-1-pentene polymer (A) is preferably 30% by mass or more, more preferably 40% by mass or more, based on the total amount of the resin composition, and may be 100% by mass based on the total amount of the resin composition.

[0038] The 4-methyl-1-pentene polymer (A) can be produced by various methods, for example, using known catalysts such as magnesium-supported titanium catalysts, metallocene catalysts described in WO 01 / 53369, WO 01 / 027124, JP-A 3-193796, and JP-A 02-41303, and olefin polymerization catalysts containing metallocene compounds described in WO 2011 / 055803.

[0039] Furthermore, the first resin composition may contain one or two selected from the group consisting of a styrene-based copolymer (B) and a silicone-based copolymer (C).

[0040] [Styrene copolymer (B)] The styrene copolymer (B) is preferably a block copolymer of a polystyrene block and a diene block. By using the styrene copolymer (B) in combination, heat resistance and cold resistance can be obtained.

[0041] The content of the polystyrene block (styrene content) relative to the total amount of the styrene copolymer (B) is greater than 0.0 mass% and not more than 50 mass%, preferably 5 mass% or more and not more than 50 mass%, more preferably 30 mass% or not more, and even more preferably 15 mass% or not more.

[0042] Furthermore, the styrene copolymer (B) may be hydrogenated from the viewpoint of stability. This is particularly suitable when the multilayer sheet of the present embodiment is applied to clothing. The hydrogenation can be carried out by hydrogenating the block copolymer in an inert solvent in the presence of a hydrogenation catalyst by a known method. Furthermore, hydrogenation may be partial or complete. However, from the viewpoint that hydrogenation reduces unsaturated bonds and makes it easier to obtain flexibility, heat resistance, mechanical properties, and the like, the hydrogenation rate is preferably such that 50% or more, and more preferably 80% or more of the olefinic double bonds in the copolymer block are hydrogenated.

[0043] The styrene copolymer (B) is preferably one or more selected from hydrogenated styrene-butadiene rubber, hydrogenated styrene-butadiene block copolymer (SEBS), hydrogenated styrene-isoprene block copolymer (SEPS), and hydrogenated styrene-isoprene-butadiene block copolymer (SEEPS). Among these, hydrogenated styrene-butadiene block copolymer (SEBS) is more preferred from the viewpoint of heat resistance and low-temperature tensile elongation. Furthermore, it may have a structure mainly composed of vinyl bonds (1,2-vinyl bonds are 30 to 50%), and may be what is known as vinyl SEBS, vinyl SEPS, or vinyl SEEPS.

[0044] As the styrene copolymer (B), commercially available products such as "Kraton (registered trademark) G" manufactured by Kraton Polymers, "Hybler (registered trademark)" and "Septon (registered trademark)" manufactured by Kuraray Co., Ltd., "Tuftec (registered trademark)" and "SOE (registered trademark)" manufactured by Asahi Kasei Corporation, and "Dynaron (registered trademark)" manufactured by ENEOS Materials Corporation may be used.

[0045] The content of the styrene copolymer (B) is preferably 50 to 400 parts by mass, more preferably 100 to 300 parts by mass, and even more preferably 120 to 200 parts by mass, relative to 100 parts by mass of the 4-methyl-1-pentene polymer (A). By setting the content of the styrene copolymer (B) to the above lower limit or more, it is possible to improve the tensile elongation while maintaining the stress relaxation property, whereas by setting the content of the styrene copolymer (B) to the above upper limit or less, it is possible to improve the stress relaxation property and flexibility while maintaining the tensile elongation property.

[0046] [Silicone copolymer (C)] The silicone copolymer (C) may be any copolymer that is compatible with the 4-methyl-1-pentene polymer (A), and is preferably a polyolefin-silicone block copolymer (C1). By using the silicone copolymer (C) in combination, blocking on the surface of the multilayer sheet can be further suppressed.

[0047] Examples of the polyolefin-silicone block copolymer (C1) include a block copolymer in which a polyolefin chain is bonded in the order (polyolefin chain)-(silicone chain)-(polyolefin chain), and a block copolymer in which a polyolefin chain is bonded in the order (polyolefin chain)-(silicone chain)-(polyolefin chain). A polyolefin may be grafted onto the silicone portion of the block copolymer.

[0048] The polyolefin chain of the polyolefin-silicone block copolymer (C1) is preferably a polymer chain containing a structural unit derived from an olefin having 2 to 20 carbon atoms, more preferably 2 to 10 carbon atoms, and even more preferably 2 to 3 carbon atoms. Furthermore, in a copolymer chain of ethylene and an α-olefin having 3 to 20 carbon atoms, when all structural units are taken as 100 mol %, the structural units derived from an α-olefin having 3 to 20 carbon atoms can be, for example, more than 0 mol % and not more than 20 mol %, or can also be more than 0 mol % and not more than 10 mol %.

[0049] In the polyolefin-silicone block copolymer (C1), the silicone chain / polyolefin chain (weight ratio) is not particularly limited, but is, for example, preferably 5 / 95 to 99 / 1, and more preferably 10 / 90 to 95 / 5.

[0050] The method for producing the polyolefin-silicone block copolymer (C1) is not particularly limited, but examples thereof include the methods described in paragraphs 0089 to 0145 and 0196 to 0207 of WO 2012 / 098865.

[0051] The content of the silicone copolymer (C) is preferably 0.1 parts by mass or more and 20 parts by mass or less, more preferably 0.2 to 10 parts by mass, and even more preferably 0.5 to 5 parts by mass, relative to 100 parts by mass of the 4-methyl-1-pentene polymer (A). By setting the content of the silicone copolymer (C) to at least the above lower limit, it is possible to suppress blocking on the surface of the multilayer sheet while maintaining extrusion moldability, whereas by setting the content of the silicone copolymer (C) to no more than the above upper limit, it is possible to suppress blocking on the surface of the multilayer sheet while improving extrusion moldability and flexibility.

[0052] [Other ingredients] The first resin composition according to this embodiment may contain known additives as needed, provided that the effects of the present invention are not impaired. Examples of such additives include antiblocking agents, colorants, heat stabilizers, antioxidants, UV absorbers, pigments, antistatic agents, copper inhibitors, flame retardants, neutralizing agents, plasticizers, nucleating agents, weather stabilizers, light stabilizers, antioxidants, fatty acid metal salts, softeners, dispersants, lubricants, natural oils, synthetic oils, and waxes.

[0053] Examples of the antiblocking agent include fine particle inorganic compounds such as silica, alumina, alumina silicate, and diatomaceous earth; and fine particle organic compounds such as polyethylene, cross-linked polyethylene, polymethyl methacrylate, and cross-linked polymethyl methacrylate. Use of an anti-blocking agent can improve the handling properties when wound into a roll. The content of the antiblocking agent can be appropriately set depending on the purpose and application.

[0054] <2nd layer> The second layer is a layer that constitutes the multilayer sheet together with the first layer, and the second layer contains a 4-methyl-1-pentene copolymer (A), which allows the entire multilayer sheet to have the properties of a sheet that uses the 4-methyl-1-pentene copolymer (A).

[0055] The second layer is preferably a foamed layer from the viewpoint of improving flexibility and fit. A foamed layer is a layer having a large number of bubbles, and is intended to mean a layer obtained through a foaming process using a foaming agent. The specific gravity of the second layer is preferably 0.40 to 0.85, more preferably 0.45 to 0.80, and even more preferably 0.48 to 0.75. Furthermore, it is preferable that the specific gravity of the second layer is relatively lower than that of the first layer. The expansion ratio is not particularly limited and can be appropriately determined taking into consideration the use of the multilayer sheet, etc.

[0056] The second layer is preferably located inside the multilayer sheet, ie, serves as an intermediate layer, and is more preferably sandwiched between the first layers. Furthermore, the second layer may be two or more layers. This can further improve the tensile break resistance of the multilayer sheet. When there are multiple second layers, the second layers may be laminated continuously or with other layers interposed therebetween. It is also preferable that the second resin compositions constituting the second layers have the same composition.

[0057] The average thickness of the second layer is not particularly limited, but is preferably in the range of 0.1 mm to 10 mm, more preferably 0.2 mm to 5 mm, and even more preferably 0.3 mm to 3 mm.

[0058] <Second resin composition> The second layer is formed from a second resin composition. The second resin composition contains at least a 4-methyl-1-pentene copolymer (A). Examples of the 4-methyl-1-pentene copolymer (A) include the same 4-methyl-1-pentene copolymer (A) as explained in the first resin composition.

[0059] The 4-methyl-1-pentene copolymer (A) used in the first resin composition and the 4-methyl-1-pentene copolymer (A) used in the second resin composition may be the same or different, and are preferably different from the viewpoint of achieving both extensibility and break resistance.

[0060] Furthermore, the second resin composition may contain one or two selected from the group consisting of a styrene-based copolymer (B) and a silicone-based copolymer (C). Examples of the styrene copolymer (B) include the same as those explained in the first resin composition. Furthermore, when the second resin composition contains a styrene-based copolymer (B), the styrene-based copolymer (B) used in the second resin composition and the styrene-based copolymer (B) used in the first resin composition may be the same or different from each other, but from the viewpoint of achieving both extensibility and break resistance, it is preferable that they are the same.

[0061] Furthermore, the second resin composition preferably contains a thermally decomposable chemical foaming agent, which allows the second layer to be a foamed layer. The thermally decomposable chemical foaming agent will be described in detail later. The content of the thermally decomposable chemical foaming agent in the second resin composition is preferably 1 to 15 parts by weight, more preferably 3 to 13 parts by weight, and even more preferably 4 to 12 parts by weight, relative to 100 parts by weight of the 4-methyl-1-pentene copolymer (A).

[0062] Furthermore, the resin compositions of the first resin composition for forming the first layer and the second resin composition for forming the second layer may be the same or different, except for the presence or absence of a foaming agent. Examples of cases where the resin compositions are different include cases where the configurations and contents of the 4-methyl-1-pentene polymer (A), the styrene copolymer (B), and the silicone copolymer (C) are different, and cases where the types and contents of additives other than the foaming agent are different.

[0063] Similarly to the first resin composition, the second resin composition may contain known additives as needed within the range that does not impair the effects of the present invention. However, in order to obtain good fit and flexibility, the proportion of the 4-methyl-1-pentene copolymer (A) in the second resin composition is preferably 90% by mass or more, more preferably 98% by mass or more, and may be 100% by mass.

[0064] <Method of manufacturing multilayer sheet> The method for producing the multilayer sheet of the present embodiment includes a step of co-extruding and laminating a first resin composition for forming the first layer and a second resin composition for forming the second layer. The first resin composition and the second resin composition are obtained by mixing or melt-kneading them using known methods such as dry blending, a tumbler mixer, a Banbury mixer, a single-screw extruder, a twin-screw extruder, a high-speed twin-screw extruder, and a heated roll. The obtained first resin composition and second resin composition are formed into a sheet by co-extrusion and laminated to obtain a multilayer sheet. After extrusion, the extruded composition may be further cooled with a cooling roll and wound into a roll using a take-up machine.

[0065] Furthermore, during co-extrusion, the second resin composition may be foamed, thereby forming the second layer into a foamed layer. Examples of foaming methods include the following.

[0066] When a thermally decomposable chemical foaming agent is used, a method can be used in which a second resin composition containing the thermally decomposable chemical foaming agent is prepared and foamed while being extruded into a sheet. The amount of the thermally decomposable chemical foaming agent is preferably 1 to 15 parts by weight, more preferably 4 to 12 parts by weight, per 100 parts by weight of the 4-methyl-1-pentene copolymer (A) in the second resin composition. The thermal decomposition type chemical foaming agent may be either inorganic or organic. Examples of inorganic thermal decomposition type chemical foaming agents include inorganic carbonates such as sodium hydrogen carbonate, sodium carbonate, ammonium hydrogen carbonate, and ammonium carbonate, and nitrites such as ammonium nitrite. Examples of organic thermal decomposition type chemical blowing agents include nitroso compounds such as N,N'-dimethyl-N,N'-dinitrosoterephthalamide and N,N'-dinitrosopentamethylenetetramine; azo compounds such as azodicarbonamide, azobisisobutyronitrile, azocyclohexylnitrile, azodiaminobenzene and barium azodicarboxylate; sulfonyl hydrazide compounds such as benzenesulfonyl hydrazide, toluenesulfonyl hydrazide, p,p'-oxybis(benzenesulfonyl hydrazide) and diphenylsulfone-3,3'-disulfonyl hydrazide; and azide compounds such as calcium azide, 4,4'-diphenyldisulfonyl azide and p-toluenesulfonyl azide. These may be used alone or in combination.

[0067] In addition, when a physical foaming agent is used, the second resin composition is charged into an extrusion molding machine, kneaded in the extrusion molding machine, and after it has become plasticized, the physical foaming agent is directly injected into the extrusion molding machine and foamed while being extruded into a sheet. Examples of physical foaming agents include carbon dioxide, nitrogen, and a mixture of carbon dioxide and nitrogen, and any of these can be supplied in the form of a gas, liquid, or supercritical state.

[0068] An example of a reference form of the multilayer sheet of this embodiment will be illustrated below. A multilayer sheet in which a non-foamed layer containing a 4-methyl-1-pentene copolymer (A) / a foamed layer containing a 4-methyl-1-pentene copolymer (A) / a non-foamed layer containing a 4-methyl-1-pentene copolymer (A) are laminated in this order. A multilayer sheet laminated in the following order: a non-foamed layer containing a 4-methyl-1-pentene copolymer (A), a foamed layer containing a 4-methyl-1-pentene copolymer (A) and a styrene copolymer (B), and a non-foamed layer containing a 4-methyl-1-pentene copolymer (A). A multilayer sheet laminated in the following order: a non-foamed layer containing a 4-methyl-1-pentene copolymer (A) and a styrene copolymer (B), a foamed layer containing a 4-methyl-1-pentene copolymer (A) and a styrene copolymer (B), and a non-foamed layer containing a 4-methyl-1-pentene copolymer (A) and a styrene copolymer (B). A multilayer sheet in which a non-foamed layer containing a 4-methyl-1-pentene copolymer (A) and a silicone copolymer (C) / a foamed layer containing a 4-methyl-1-pentene copolymer (A) / a non-foamed layer containing a 4-methyl-1-pentene copolymer (A) and a silicone copolymer (C) are laminated in this order.

[0069] <Application> The multilayer sheet according to this embodiment and the fabric laminated sheet described below can be widely used in any field. For example, mobility products such as automobile parts, railway parts, aircraft parts, ship parts, and bicycle parts; electronic devices; household electrical appliances; audio equipment; camera equipment; precision instruments; game equipment; VR equipment; civil engineering and construction products such as civil engineering parts, building parts, and construction materials; household goods such as furniture and bedding; daily necessities such as kitchen utensils, toiletries, and stationery; outdoor equipment, leisure goods such as backpacks; agricultural products such as gardening supplies; apparel products (clothes, underwear, and interlining materials for underwear (e.g., bras, shoulder pads, and shapewear), hats, belts, and school bags). linings, business card holders, glasses, etc.), shoe supplies (various insoles, shoe lining materials, various equipment, shoes, shoelaces, etc.), decorative products such as accessories and small portable miscellaneous items; medical supplies, health care supplies, etc.; sports supplies such as sporting goods; educational and toy supplies such as books and toys; packaging supplies such as packaging materials; cosmetic supplies such as face washes and makeup supplies; lighting supplies such as LED lighting; aquaculture supplies such as fisheries supplies; safety supplies such as child seats; music supplies; pet supplies; fishing supplies, etc.

[0070] In particular, the multilayer sheet of the present embodiment is preferably used for washroom components, kitchen components, toilet components, bathroom components, home appliances, sporting goods (grip parts, etc.), automotive components, sanitary goods, clothing, or parts of clothing. It can also be suitably used for bathroom components such as faucets and shelves for storing small items such as toothbrushes, toilet components such as toilet bowls, toilet seats, toilet lids and urinals, bathroom components such as faucets, shower heads, soap dishes, bathtub covers and mirrors, golf grips, sports grips, touch panels, mice, human body detection sensor covers, car seats, chairs, stationery and other items that people come into direct contact with. The material is particularly suitable for use in clothing, including general clothing, underwear, undergarments, hats, and shoe accessories. The material is intended to be a part of such clothing, such as a core material for underwear or an insole for shoes. This allows the material to conform appropriately to the movements and shape of the human body when used by a human, providing a smooth and flexible feel, a pleasant texture, and a good fit and feel. The material also provides good stretchability and excellent break resistance.

[0071] 2. Roll body The roll body is made of the multilayer sheet of this embodiment wound around a core. In this embodiment, the number of windings in the roll body is in the order of tens to thousands. Since the multilayer sheet of this embodiment has the first layer, blocking is suppressed, allowing for smooth winding and unwinding. The roll body may or may not use a release sheet.

[0072] 3. Fabric laminated sheet The fabric laminated sheet of this embodiment is formed by thermocompression bonding the above-described multilayer sheet and fabric, thereby realizing a fabric laminated sheet having new functions, such as making the most of the flexibility and texture of the fabric while simultaneously achieving the excellent extensibility and tear resistance of the multilayer sheet of this embodiment.

[0073] The fabrics are thinly processed fibers such as natural fibers, synthetic fibers, and chemical fibers, and examples of the fabrics include woven fabrics such as woven cloth, nonwoven fabrics, etc. Specific examples include knitted fabrics with weft knitting structures such as jersey, rib knit, smooth knit, and double knit, knitted fabrics with warp knitting structures such as tricot and raschel, and woven fabrics with structures such as plain weave, twill weave, and satin.

[0074] The thickness of the material is preferably 0.2 to 1.0 mm, more preferably 0.2 to 0.8 mm, and even more preferably 0.2 to 0.6 mm, from the viewpoints of adhesion to the multilayer sheet and maintaining the properties of the multilayer sheet.

[0075] The weight of the fabric is not particularly limited from the viewpoint of adhesiveness and heat resistance, but from the viewpoint of handling, for example, it is preferably 75 to 300 g / m 2 It is preferable that the density is 90 to 250 g / m 2 More preferably, it is 100 to 200 g / m 2 It is more preferable that:

[0076] Furthermore, it is preferable that the fabric has elasticity. Specifically, it is preferable that the fabric has an elongation of 10 to 300% in the direction of greatest elasticity.

[0077] Fabric materials include natural fibers such as cotton, linen, wool, and silk; regenerated fibers such as rayon and cupra; semi-synthetic fibers such as acetate and triacetate; synthetic fibers such as nylon, polyester, polyurethane, acrylic, and rayon; and chemical fiber products made from blends of these synthetic fibers. Of these, synthetic fibers are preferred, and one or more types selected from nylon, polyester, polyurethane, acrylic, and rayon are more preferred.

[0078] The fabric laminated sheet may be a multilayer sheet having fabrics bonded to both sides thereof. In this case, the fabric on one side of the multilayer sheet and the fabric on the other side of the multilayer sheet may be made of the same material or different materials.

[0079] Furthermore, the fabric laminated sheet of this embodiment may have at least a partially curved surface, with the radius of curvature of the curved surface being in the range of 50 mm to 150 mm. This allows the fabric laminated sheet of this embodiment to easily conform to curved surfaces. Examples of curved surfaces include rounded parts of the human body, such as the head, chest, elbows, and knees. Examples of clothing that can be worn on curved surfaces include hats, hoods, brassieres, underwear, and supports.

[0080] Although the embodiments of the present invention have been described above, these are merely examples of the present invention, and various other configurations may be adopted. Furthermore, the present invention is not limited to the above-described embodiments, and modifications and improvements within the scope of achieving the object of the present invention are included in the present invention. [Example]

[0081] The present embodiment will be described in detail below with reference to examples and comparative examples, but the present embodiment is not limited to the descriptions of these examples.

[0082] (1) Raw materials [4-methyl-1-pentene polymer (A)] 4-Methyl-1-pentene polymer (A1): a copolymer of 4-methyl-1-pentene and propylene (content of 4-methyl-1-pentene-derived structural units (a1): 72 mol%, content of propylene-derived structural units (a2): 28 mol%), glass transition temperature: 30°C, MFR: 10 g / 10 min 4-Methyl-1-pentene polymer (A2): Copolymer of 4-methyl-1-pentene and propylene (content of structural units (a1) derived from 4-methyl-1-pentene: 85 mol%, content of structural units (a2) derived from propylene: 15 mol%), glass transition temperature: 40°C, MFR: 10 g / 10 min, melting point: 130°C [Styrene copolymer (B)] Styrene copolymer (B)-1: Hydrogenated styrene-butadiene block copolymer (SEBS) "SOE1605" (manufactured by Asahi Kasei Corporation), polystyrene block content 67% by mass, MFR 5g / 10min Styrene copolymer (B)-2: Hydrogenated styrene-butadiene block copolymer (SEBS) "SOE1606" (manufactured by Asahi Kasei Corporation), polystyrene block content 51% by mass, MFR 4g / 10min Styrene copolymer (B)-3: Hydrogenated styrene-isoprene-butadiene block copolymer (vinyl SEEPS) "Hybra 7311F" (Kuraray Co., Ltd.), polystyrene block content 12% by mass, MFR 0.5g / 10min [Silicone copolymer (C)] Silicone copolymer (C)-1: An ethylene-silicone block copolymer was used, synthesized using the following procedure. (procedure) First, polyethylene (P'-1) having a vinyl group at one end was synthesized according to the method described in Synthesis Example 2 of WO 2012 / 098865. 1 H-NMR analysis confirmed that the resulting polymer was an ethylene homopolymer containing a double bond at only one end. The weight-average molecular weight (Mw) of the polyethylene (P-1) containing a vinyl group at one end was 4,770.

[0083] The Mw of the vinyl-terminated polyethylene (P-1) was measured using a Millipore GPC-150. A TSK GNH HT (7.5 mm diameter, 300 mm length) was used as the separation column. The column temperature was 140°C, and the mobile phase was orthodichlorobenzene (Fujifilm Wako Pure Chemical Industries, Ltd.) containing 0.025% by mass of an antioxidant (dibutylhydroxytoluene, Takeda Pharmaceutical Co., Ltd.). The mobile phase was moved at a rate of 1.0 mL / min. The sample concentration was 0.1% by mass, and the sample injection volume was 500 μL. A differential refractometer was used as the detector, and a calibration curve was prepared using standard polystyrene. The values ​​were converted to polyethylene equivalent values ​​according to the usual method.

[0084] In a 50 ml sample tube equipped with a magnetic stirrer tip, 0.50 g of platinum(II) chloride was suspended in 10 ml of a hydrosilane (DMS-H11, manufactured by Gelest, Inc.) having the structure shown below, and the suspension was stirred at room temperature under a nitrogen stream. After stirring for 190 hours, approximately 0.4 ml of the reaction solution was sampled using a syringe and filtered through a 0.45 μm PTFE filter. The filtrate was collected in a 10 ml sample tube, yielding a platinum catalyst composition (PC-1) with a platinum concentration of 3.8 mass%. Hydrosilane: H-Si(CH3)2O-(Si(CH3)2-O) n -Si(CH3)2-H (n=12~13)

[0085] Next, 25.1 g (11.8 mmol) of polyethylene (P-1) containing a vinyl group at one end was placed in a 300 mL two-neck flask, and under a nitrogen atmosphere, 6.7 g (5.9 mmol) of the hydrosilane and 150 μL of a diluted solution prepared by diluting the platinum catalyst composition (PC-1) 200 times with the hydrosilane were added. The two-neck flask was placed in an oil bath whose internal temperature had been preheated to 130°C, and the contents of the two-neck flask were stirred. After 6 hours, stirring was stopped, the two-neck flask was cooled, approximately 200 mL of methanol was added, and the contents were transferred to a 300 mL beaker and stirred for an additional 2 hours. The solid was then filtered, washed with methanol, and dried at 60°C under reduced pressure of 2 hPa or less, yielding 33.1 g of a white solid ethylene-silicone block copolymer (silicone copolymer (C)-1). The polyorganosiloxane content in the silicone copolymer (C)-1 calculated from the molecular formula was 23 mass %.

[0086] [Foaming agent] Thermal decomposition type chemical foaming agent-1: "Polyslen EE275F" manufactured by Eiwa Chemical Industry Co., Ltd.

[0087] (2) Fabrication of multilayer sheet (resin sheet) First, the raw materials (1) above were mixed (dry blended) in the proportions shown in Table 1 to prepare the resin materials (A-1) to (A-2), (B-1) to (B-3), and (C-1) to (C-3).

[0088] [Table 1]

[0089] Next, the prepared resin materials were used to form multilayer sheets (resin sheets) shown in Table 2. In Table 2, the first layer (outer layer 1), the second layer (core layer), and the first layer (outer layer 2) were laminated in this order. Specific examples and comparative examples will be described below.

[0090] Example 1 The resin materials and blowing agents were added to the hopper of a multilayer film molding machine equipped with a multilayer T-die (lip width 350 mm), two single-screw extruders with a cylinder inner diameter of φ20 mm (for the non-foamed layer [layer 1]), and one single-screw extruder with a cylinder inner diameter of φ25 mm (for the core layer [layer 2]) so that the amounts shown in Table 2 were obtained. The temperatures of the cylinders of each extruder were 130°C to 240°C for the first layer and 140°C to 230°C for the second layer, and the die temperature was 190°C. The melt-kneaded mixture of the resin materials for the first layer and the second layer was co-extruded from the T-die to achieve the cross-sectional layer configuration and total thickness shown in Table 2. The mixture was cast using a mirror-finished chill roll set at 20°C and then withdrawn to obtain a multilayer sheet.

[0091] <Examples 2 to 3, 7 to 10> A multilayer sheet was obtained in the same manner as in Example 1, except that the resin materials and foaming agents were used in amounts as shown in Table 2.

[0092] <Examples 4 to 6> A multilayer sheet was obtained in the same manner as in Example 1, except that each resin material and foaming agent was used in the amounts shown in Table 2, the temperature of each part of the cylinder of each extruder was set to 170°C to 240°C for the first layer and 170°C to 230°C for the second layer, and the die temperature was changed to 205°C.

[0093] <Comparative Examples 1, 2, and 4> Each resin material and foaming agent was charged into the hopper of a single-screw extruder with a T-die (lip width 350 mm) and a cylinder inner diameter of φ20 mm so as to obtain the contents shown in Table 2. The temperature of the extruder cylinder was set to 140°C to 230°C, and the die temperature was set to 190°C. The molten mixture of resin materials was extruded from the T-die, cast-molded using a chill roll with a mirror surface set at 20°C, and then taken up to obtain a single-layer sheet.

[0094] <Comparative Example 3> A single-layer sheet was obtained in the same manner as in Comparative Example 1, except that the resin material and foaming agent were used so as to have the contents shown in Table 2, the temperature of the extruder cylinder was set to 170°C to 230°C, and the die temperature was changed to 205°C.

[0095] (3) Evaluation and measurement The multilayer sheets (resin sheets) of the Examples and Comparative Examples obtained in (2) above were used to carry out the following evaluations and measurements. The results are shown in Table 1.

[0096] [Loss tangent (tanδ)] The resin sheet was cut into strips (30 mm long x 10 mm wide) to prepare test specimens. The temperature dependence of dynamic viscoelasticity was measured for the test specimens using a TA Instruments RSA-III under the following conditions: chuck distance 20 mm, frequency 1.59 Hz, strain 0.1%, heating rate 4°C / min, and tensile mode, over a temperature range of -60°C to 110°C, and the maximum value of loss tangent (tanδ) was determined.

[0097] [Stress at break, tensile elongation at break] Using the obtained resin sheet, a test piece was prepared under the following conditions, and a tensile test was carried out to measure the stress at break and the tensile elongation at break. Test piece shape: Strip, width 25mm (common) Test piece direction: MD direction (common) Distance between chucks: 30mm (common) Pulling speed: 300mm / min (common) ·Measurement temperature: 23℃ Number of measurement points: n=3 at each temperature

[0098] [Moldability] During steady-state operation during molding, the molding was visually inspected and evaluated according to the following criteria. ·standard 5: Almost no resin was observed during extrusion from the die. 4: A small amount of resin was generated during extrusion from the die, but the effect on the molded product was hardly observed. 3: During extrusion from the die, resin was generated, causing minor effects such as roughness on the surface of the compact, but no major effects such as adhesion to the compact were observed. 2. During extrusion from the die, resin was generated, causing roughness on the surface of the compact, but adhesion to the compact was also observed. 1: A large amount of resin was generated during extrusion from the die, and it was confirmed that this had a significant impact, such as adhesion to the molded body.

[0099] [Removability] Using each of the obtained multilayer sheets of the Examples, laminates (two multilayer sheets) were prepared according to the procedures shown under Condition I (Evaluation 1) and Condition II (Evaluation 2) at an ambient temperature of 23° C. Each laminate was peeled off by hand and evaluated according to the following criteria. A: The multilayer sheet did not stretch and was easily peeled off. B: The multilayer sheet was able to be peeled off while being stretched. C: The multilayer sheets were welded together and could not be peeled off.

[0100] [Condition i] Two multilayer sheets were cut into strips measuring 100 mm in length and 50 mm in width, and test pieces were prepared so that the MD direction of the two multilayer sheets was the length direction. One end of the test piece (pressure area: 50 mm square) was pressed with a pressure of 0.4 N / cm. 2 The specimen was then crimped at 40°C for 24 hours. [Condition ii] Two multilayer sheets were pressed together in the same manner as in condition i, except that the standing conditions after pressing were changed to 90°C for 1 hour.

[0101] [Table 2]

Claims

1. a first layer which is a non-foamed layer constituting one surface and which contains a 4-methyl-1-pentene copolymer (A); a second layer containing a 4-methyl-1-pentene copolymer (A); A multilayer sheet in which A multilayer sheet, wherein the 4-methyl-1-pentene copolymer (A) contains a structural unit derived from 4-methyl-1-pentene and a structural unit derived from a linear α-olefin having 2 to 3 carbon atoms.

2. The multilayer sheet according to claim 1, The second layer has a relatively lower specific gravity than the first layer.

3. The multilayer sheet according to claim 1 or 2, The multilayer sheet, wherein the second layer is a foam layer.

4. The multilayer sheet according to claim 1 or 2, A multilayer sheet, wherein the loss tangent (tan δ) measured by dynamic viscoelasticity measurement under conditions of a heating rate of 4°C / min, a frequency of 1.59 Hz, and a strain of 0.1% has one or more temperatures in the range of 10°C to 100°C, and the maximum value of the loss tangent is 0.5 to 3.

5.

5. The multilayer sheet according to claim 1 or 2, A multilayer sheet comprising the first layer on both sides of the multilayer sheet.

6. The multilayer sheet according to claim 1 or 2, A multilayer sheet, wherein the first layer and the second layer are in contact with each other at least in part.

7. The multilayer sheet according to claim 1 or 2, A multilayer sheet, wherein the ratio of the total layer thickness (μm) of the second layer to the total layer thickness (μm) of the first layer (second layer thickness / first layer thickness) is 0.05 to 5.

8. The multilayer sheet according to claim 1 or 2, A multilayer sheet, wherein the first layer contains one or two copolymers selected from the group consisting of a styrene-based copolymer (B) and a silicone-based copolymer (C).

9. The multilayer sheet according to claim 1 or 2, The multilayer sheet, wherein the second layer contains a styrene copolymer (B).

10. The multilayer sheet according to claim 1 or 2, A multilayer sheet having a breaking stress in the machine direction of 4 to 20 MPa and a tensile breaking elongation of 300 to 1000% when stretched at a tensile speed of 300 mm / min in accordance with JIS K7127.

11. The multilayer sheet according to claim 1 or 2, The multilayer sheet is a coextruded multilayer sheet.

12. The multilayer sheet according to claim 1 or 2, The multilayer sheet has a specific gravity of 0.50 to 0.

90.

13. The multilayer sheet according to claim 1 or 2, the second layer contains a 4-methyl-1-pentene copolymer (A) and a thermal decomposition type chemical foaming agent, A multilayer sheet comprising a thermally decomposable chemical foaming agent in an amount of 1 to 15 parts by weight based on 100 parts by weight of a 4-methyl-1-pentene copolymer (A).

14. The multilayer sheet according to claim 1 or 2, The second layer has an average thickness of 50 to 1000 μm.

15. The multilayer sheet according to claim 1 or 2, The multi-layer sheet, wherein the first layer further comprises an anti-blocking agent.

16. 3. The multilayer sheet according to claim 1 or 2, which is used as a sanitary product, clothing, or part of clothing.

17. A roll body in which the multilayer sheet according to claim 1 or 2 is wound around a core.

18. A fabric laminated sheet, obtained by thermocompression bonding the multilayer sheet according to claim 1 or 2 and fabric.

19. A method for producing the multilayer sheet according to claim 1 or 2, A method for producing a multilayer sheet, comprising a step of co-extruding and laminating a first resin composition for forming the first layer and a second resin composition for forming the second layer.

20. A method for producing the multilayer sheet according to claim 1 or 2, The method for producing a multilayer sheet, wherein in the laminating step, the second resin composition is co-extruded and foamed.

21. 20. A method for producing the multilayer sheet according to claim 19, comprising: The second resin composition contains a thermally decomposable chemical foaming agent, and the second resin composition contains 1 to 15 parts by weight of a pre-thermal decomposition type chemical foaming agent per 100 parts by weight of the 4-methyl-1-pentene copolymer (A) in the second resin composition.

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