Resin sheet

Abstract

To provide a resin sheet which is freely attachable and / or detachable in a wider temperature range.SOLUTION: A resin sheet of the invention is constituted of a resin composition including a 4-methyl-1-pentene-based polymer (A), in which the 4-methyl-1-pentene-based polymer (A) has a constitutional unit (a1) derived from 4-methyl-1-pentene and a constitutional unit (a2) derived from a 2-3C linear α-olefin, and satisfies the following condition i. The condition i: a laminated body with a size of (100 cm)×(25 mm), produced after pressure-bonding two of the resin sheets at 40°C and 24 hours, with a pressure of 0.4 N / cm2 is prepared, then after left standing the laminated body at 40°C for 24 hours, 180° peel strength between the resin sheets is 0.5 N / 25 mm or higher and 20 N / 25 mm or lower.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to a resin sheet, and more particularly to a resin sheet, a piece obtained by cutting a resin sheet to a predetermined size, a piece set, and a method for manufacturing a resin sheet. [Background technology]

[0002] It is known that a resin sheet using a 4-methyl-1-pentene polymer having 4-methyl-1-pentene as a main constituent monomer has excellent flexibility and elasticity, and has moderate adhesiveness, etc. In recent years, the use of such a resin sheet using a 4-methyl-1-pentene polymer in various fields has been increasingly expected.

[0003] For example, Patent Document 1 (International Publication No. WO 2022 / 244286) discloses that the adhesiveness of a resin sheet using a 4-methyl-1-pentene polymer is utilized for a toy. In other words, it is disclosed that the resin sheet can be easily attached and detached at a temperature close to body temperature, and therefore the resin sheet cut into pieces can be combined like blocks to play with. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] International Publication No. 2022 / 244286 Summary of the Invention [Problem to be solved by the invention]

[0005] However, conventional resin sheets tend to become too adhesive when left for a long time at temperatures higher than body temperature or when the temperature rises in summer, etc. Therefore, conventional resin sheets such as those disclosed in Patent Document 1 have room for improvement in adhesiveness at high temperatures. [Means for solving the problem]

[0006] Therefore, the inventors of the present invention have conducted extensive research to suppress the increase in adhesive strength of the resin sheet due to temperature rise, and have found that it is effective for the resin sheet to satisfy certain conditions. This makes it possible to obtain a resin sheet that is easily attached and detached over a wide range of temperatures, from temperatures close to body temperature to temperatures higher than body temperature.

[0007] That is, according to the present invention, there are provided the following resin sheet and related techniques.

[0008] [1] A resin sheet made of a resin composition containing a 4-methyl-1-pentene polymer (A), The 4-methyl-1-pentene polymer (A) has a structural unit (a1) derived from 4-methyl-1-pentene and a structural unit (a2) derived from a linear α-olefin having 2 to 3 carbon atoms, A resin sheet that satisfies the following condition i. Condition i: Two of the resin sheets were placed at 40° C. for 24 hours with a pressure of 0.4 N / cm 2 The 180° peel strength of a laminate measuring 100 cm x 25 mm after compression bonding is 0.5 N / 25 mm or more and 20 N / 25 mm or less. [2] The resin sheet according to [1]1, The 4-methyl-1-pentene polymer (A) contains a 4-methyl-1-pentene polymer (A1) and a 4-methyl-1-pentene polymer (A2), The 4-methyl-1-pentene polymer (A1) contains 60 mol % or more and 80 mol % or less of structural units (a1) derived from 4-methyl-1-pentene and 20 mol % or more and 40 mol % or less of structural units (a2) derived from a linear α-olefin having 2 to 3 carbon atoms; The 4-methyl-1-pentene polymer (A2) contains more than 80 mol % and not more than 95 mol % of structural units (a1) derived from 4-methyl-1-pentene, and contains 5 mol % or more and less than 20 mol % of structural units (a2) derived from a linear α-olefin having 2 to 3 carbon atoms. [3] The resin sheet according to [2], Based on the total amount of 4-methyl-1-pentene polymer (A), The 4-methyl-1-pentene polymer (A1) is 80% by mass or more and 99% by mass or less, A resin sheet comprising a 4-methyl-1-pentene polymer (A2) at 1% by mass or more and 20% by mass or less. [4] The resin sheet according to any one of [1] to [3], The resin sheet comprises a 4-methyl-1-pentene polymer (A) in an amount of 85 mass % or more based on the total amount of the resin composition. [5] The resin sheet according to any one of [1] to [4], The resin sheet, wherein the resin composition further contains a linear α-olefin copolymer (B) having 2 to 10 carbon atoms. [6] The resin sheet according to any one of [1] to [5], The resin sheet, wherein the resin composition further contains a colorant. [7] The resin sheet according to [6], The resin sheet has a content of the colorant of 0.05% by mass or more and 1.5% by mass or less with respect to the total amount of the resin composition. [8] The resin sheet according to any one of [1] to [7], A single layer resin sheet. [9] A piece of the resin sheet described in any one of [1] to [8] cut to a specified size.

[10] A piece set having multiple pieces as described in [9] and used as a toy.

[11] A method for producing a resin sheet according to any one of [1] to [8], A method for producing a resin sheet, comprising: mixing a 4-methyl-1-pentene polymer (A) with a master batch to prepare the resin composition. Effect of the Invention

[0009] According to the present invention, it is possible to provide a resin sheet that is removable over a wider range of temperatures, and techniques relating thereto. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] In this specification, the expression "a to b" in the explanation of a numerical range means from a to b, unless otherwise specified. For example, "1 to 5% by mass" means "1% by mass to 5% by mass."

[0011] In this specification, MD direction stands for machine direction and refers to the flow direction of a resin or sheet, and TD direction stands for transverse direction and refers to the direction perpendicular to the flow direction.

[0012] 1. Resin sheet The resin sheet of this embodiment is composed of a resin composition containing a 4-methyl-1-pentene polymer (A). The 4-methyl-1-pentene polymer (A) has a structural unit (a1) derived from 4-methyl-1-pentene and a structural unit (a2) derived from a linear α-olefin having 2 to 3 carbon atoms, and is configured to satisfy the following condition i.

[0013] Condition i: Two of the resin sheets were placed at 40° C. for 24 hours with a pressure of 0.4 N / cm 2 The 180° peel strength of a laminate measuring 100 cm x 25 mm after compression bonding is 0.5 N / 25 mm or more and 20 N / 25 mm or less.

[0014] This makes it possible to obtain a resin sheet that can be attached and detached freely at a wide range of temperatures from close to body temperature to higher than body temperature. That is, a sheet using a conventional 4-methyl-1-pentene polymer exhibits adhesive strength when heated to a temperature close to body temperature, and can easily bond sheets together, but the adhesive strength increases with increasing temperature, and when placed at a high temperature of about 40°C, the sheets are strongly bonded together. This causes problems such as difficulty in peeling the bonded resin sheets together, or the resin sheet itself stretches too much when peeled off with excessive force, or even damage to the resin sheet. In contrast, the resin sheet of the present embodiment is configured to satisfy the predetermined condition i, thereby suppressing the increase in adhesive strength associated with temperature rise, and allowing easy manual peeling even after bonding at a high temperature of about 40° C. Furthermore, even if the resin sheet is placed at a high temperature after bonding, the increase in adhesive strength associated with temperature rise is suppressed, allowing easy manual peeling. On the other hand, the resin sheet has appropriate adhesiveness, allowing easy bonding of resin sheets to each other.

[0015] Although the details of the mechanism of the relationship between condition i of the resin sheet of this embodiment and the function and effect are not clear, it is speculated as follows. A resin sheet made of a resin composition containing a 4-methyl-1-pentene polymer (A) having a structural unit (a1) derived from 4-methyl-1-pentene and a structural unit (a2) derived from a linear α-olefin having 2 to 3 carbon atoms has a moderate adhesiveness, is detachable at a temperature of about 10 to 30°C, and shows a tendency for the adhesiveness to increase with increasing temperature. The laminate after being left at 40°C for 24 hours under condition i is intended to be in a state in which the resin sheets made of a resin composition containing a 4-methyl-1-pentene polymer (A) are stored at high temperature while being in contact with each other. Therefore, it is considered that by preparing a resin sheet so as to satisfy condition i, the adhesiveness of the resin sheet can be suppressed from increasing with increasing temperature, and the adhesiveness at high temperatures can be more highly controlled. As a result, a resin sheet that is detachable at a wider range of temperatures can be obtained.

[0016] Furthermore, the 180° peel strength under the above condition i is 0.5 N / 25 mm or more and 20 N / 25 mm or less. In order to obtain a suitable adhesiveness, the 180° peel strength under the above condition i is preferably 1.0 N / 25 mm or more, more preferably 1.5 N / 25 mm or more, and even more preferably 2.0 N / 25 mm or more. On the other hand, in order to obtain a good releasability even at high temperatures, the 180° peel strength under the above condition i is preferably 18 N / 25 mm or less, more preferably 15 N / 25 mm or less, and even more preferably 13 N / 25 mm or less.

[0017] Moreover, it is preferable that the resin sheet of the present embodiment is configured so as to further satisfy the following condition ii: This allows the resin sheet to obtain adhesiveness simply by warming it with the body heat of the palm of the hand or the like.

[0018] Condition ii: Two of the resin sheets were subjected to a pressure of 0.4 N / cm at 30° C. for 1 hour. 2 The 180° peel strength of a laminate measuring 100 cm x 25 mm after compression bonding is 0.05 N / 25 mm or more and 5 N / 25 mm or less.

[0019] Furthermore, the 180° peel strength under the above condition ii is preferably 0.1 N / 25 mm or more, more preferably 0.2 N / 25 mm or more, from the viewpoint of easily bonding resin sheets together and easily deforming the resin sheets by simply warming them in the palm of the hand. On the other hand, the 180° peel strength under the above condition ii is preferably 4 N / 25 mm or less, more preferably 3 N / 25 mm or less, and even more preferably 2 N / 25 mm or less, from the viewpoint of easily peeling bonded resin sheets together.

[0020] Furthermore, in the resin sheet of this embodiment, {180° peel strength (N / 25 mm) under condition i} / {180° peel strength (N / 25 mm) under condition ii} is preferably 30 or less, and more preferably 25 or less. By setting the value of {180° peel strength (N / 25 mm) under condition i} / {180° peel strength (N / 25 mm) under condition ii} to be equal to or less than the above upper limit value, the increase in the adhesive strength of the resin sheet due to an increase in temperature can be suppressed.

[0021] The resin sheet satisfying the above conditions i and ii can be realized by adjusting the composition of the 4-methyl-1-pentene polymer (A) or by selecting the resin material constituting the resin sheet. Specifically, for example, different types of 4-methyl-1-pentene polymers can be used as the resin constituting the 4-methyl-1-pentene polymer (A). The different types include cases where the types or ratios of the structural units constituting the 4-methyl-1-pentene polymer (A) are different.

[0022] Next, the physical properties of the resin sheet will be described.

[0023] Thickness The average thickness of the resin sheet is not particularly limited, but is preferably in the range of 0.1 mm to 10 mm, more preferably in the range of 0.2 mm to 5 mm, and even more preferably in the range of 0.3 mm to 3 mm. By setting the average thickness of the resin sheet to be equal to or more than the above lower limit, the resin sheet can be made easy to handle when picked up, while improving its mechanical strength and expanding the freedom of design. On the other hand, by setting the average thickness of the resin sheet to be equal to or less than the above upper limit, the resin sheet can be made more flexible and lighter in weight while maintaining good handleability and mechanical strength.

[0024] [Layer composition] The resin sheet is a single layer or a multilayer. A multilayer sheet is one in which the resin composition of adjacent layers is different, and there is an interface between the layers. The resin composition is different, for example, when each layer is formed using a plurality of resin compositions having different contents of 4-methyl-1-pentene polymer (A), when each layer is formed using a plurality of resin compositions having different compositions of 4-methyl-1-pentene polymer (A), when some layers are formed from a resin composition containing an additive such as a colorant described later, etc. Furthermore, when some layers are formed from a resin composition containing an additive such as a colorant, the other layers may be layers that do not contain a colorant.

[0025] [form] The form of the resin sheet of the present embodiment may be a foam containing bubbles, or may not be foamed. The expansion ratio is not particularly limited, and can be appropriately determined in consideration of the use of the resin sheet, etc. In this embodiment, the resin sheet being a foam refers to a resin sheet having a large number of air bubbles (cavities) therein.

[0026] <Resin composition> Next, the resin composition constituting the resin sheet will be described. The resin composition constituting the resin sheet contains a 4-methyl-1-pentene polymer (A). The 4-methyl-1-pentene polymer (A) has a structural unit (a1) derived from 4-methyl-1-pentene and a structural unit (a2) derived from a linear α-olefin having 2 to 3 carbon atoms.

[0027] [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.

[0028] In the 4-methyl-1-pentene polymer (A) according to this embodiment, from the viewpoint of improving the flexibility of the resin sheet and obtaining good adhesiveness, when the sum of the structural units (a1) and (a2) is taken as 100 mol %, it is preferable that the content of the structural unit (a1) is 10 mol % or more and 90 mol % or less, and the content of the structural unit (a2) is 10 mol % or more and 90 mol % or less. In addition, in the 4-methyl-1-pentene polymer (A) according to this embodiment, from the viewpoint of improving the flexibility and mechanical properties of the resin sheet, when the sum of the structural units (a1) and (a2) is taken as 100 mol%, the content of the structural unit (a1) is more preferably 30 mol% or more and 90 mol% or less, and the content of the structural unit (a2) is more preferably 10 mol% or more and 70 mol% or less, the content of the structural unit (a1) is even more preferably 50 mol% or more and 90 mol% or less, and the content of the structural unit (a2) is even more preferably 10 mol% or more and 50 mol% or less, the content of the structural unit (a1) is even more preferably 60 mol% or more and 90 mol% or less, and the content of the structural unit (a2) is even more preferably 10 mol% or more and 40 mol% or less, and the content of the structural unit (a1) is particularly preferably 65 mol% or more and 90 mol% or less, and the content of the structural unit (a2) is particularly preferably 10 mol% or more and 35 mol% or less.

[0029] 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 from the viewpoint of obtaining flexibility while maintaining mechanical strength.

[0030] 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 the non-conjugated polyene include linear, branched or cyclic dienes having preferably 5 to 20, more preferably 5 to 10 carbon atoms, various norbornenes, norbornadienes, etc. Among these, 5-vinylidene-2-norbornene and 5-ethylidene-2-norbornene are preferred.

[0031] The 4-methyl-1-pentene polymer (A) preferably contains a 4-methyl-1-pentene polymer (A1) and a 4-methyl-1-pentene polymer (A2) other than the (A1), which makes it easier to suppress the increase in adhesive strength caused by a rise in temperature.

[0032] [4-Methyl-1-pentene polymer (A1)] The 4-methyl-1-pentene polymer (A1) preferably contains 60 mol% or more and 80 mol% or less of the structural units (a1) derived from 4-methyl-1-pentene and 20 mol% or more and 40 mol% or less of the structural units (a2) derived from a linear α-olefin having 2 to 3 carbon atoms, more preferably contains 65 mol% or more and 75 mol% or less of the structural units (a1) derived from 4-methyl-1-pentene and 25 mol% or more and 35 mol% or less of the structural units (a2) derived from a linear α-olefin having 2 to 3 carbon atoms, and even more preferably contains 70 mol% or more and 75 mol% or less of the structural units (a1) derived from 4-methyl-1-pentene and 25 mol% or more and 30 mol% or less of the structural units (a2) derived from a linear α-olefin having 2 to 3 carbon atoms.

[0033] [4-Methyl-1-pentene polymer (A2)] The 4-methyl-1-pentene polymer (A2) other than the (A1) preferably has a melting point, which is believed to suppress molecular motion and entanglement of resin chains that occurs when the temperature rises, and thus suppress an increase in adhesive strength. The melting point of the 4-methyl-1-pentene polymer (A2) is preferably from 90 to 160°C, more preferably from 100 to 150°C, and further preferably from 120 to 140°C. The melting point of the 4-methyl-1-pentene polymer (A2) can be measured by a differential scanning calorimeter (DSC).

[0034] The 4-methyl-1-pentene polymer (A2) preferably contains more than 80 mol % and not more than 95 mol % of structural units (a1) derived from 4-methyl-1-pentene and contains 5 mol % or more and less than 20 mol % of structural units (a2) derived from a linear α-olefin having 2 to 3 carbon atoms, and more preferably contains 82 to 93 mol % of structural units (a1) derived from 4-methyl-1-pentene and 7 to 18 mol % of structural units (a2) derived from a linear α-olefin having 2 to 3 carbon atoms.

[0035] It is preferable that the 4-methyl-1-pentene polymer (A1) is 80 mass% or more and 99 mass% or less and the 4-methyl-1-pentene polymer (A2) is 1 mass% or more and 20 mass% or less, and it is more preferable that the 4-methyl-1-pentene polymer (A1) is 85 mass% or more and 98 mass% or less and the 4-methyl-1-pentene polymer (A2) is 2 mass% or more and 15 mass% or less, based on the total amount of the 4-methyl-1-pentene polymer (A).

[0036] The total amount of the 4-methyl-1-pentene polymer (A1) and the 4-methyl-1-pentene polymer (A2) is preferably 75% by mass or more, more preferably 85% by mass or more, and even more preferably 90% by mass or more, based on the total amount of the resin composition. The total amount of the 4-methyl-1-pentene polymer (A1) and the 4-methyl-1-pentene polymer (A2) may be 100% by mass, based on the total amount of the resin composition.

[0037] The content of the 4-methyl-1-pentene polymer (A) is preferably 85% by mass or more, more preferably 90% by mass or more, and even more preferably 95% by mass or more, based on the total amount of the resin composition. The content of the 4-methyl-1-pentene polymer (A) 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, it can be produced by using a known catalyst such as a magnesium-supported titanium catalyst; a metallocene catalyst described in International Publication No. 01 / 53369, International Publication No. 01 / 027124, JP-A-3-193796, and JP-A-02-41303; or an olefin polymerization catalyst containing a metallocene compound described in International Publication No. 2011 / 055803.

[0039] [Linear α-olefin copolymer (B)] The resin composition may further contain, in addition to the 4-methyl-1-pentene polymer (A), a linear α-olefin copolymer (B) having 2 to 10 carbon atoms. As the linear α-olefin, preferably, one or two selected from ethylene, propylene, 1-butene, 1-pentene, and 1-hexene are used, and from the viewpoints of suppressing the increase in adhesive strength accompanying an increase in temperature and increasing flexibility, etc., propylene and 1-hexene are more preferable. The linear α-olefin copolymer (B) may be contained in the resin composition as a base resin of a masterbatch, which makes it possible to color the resin sheet in a desired color while suppressing the increase in adhesive strength caused by an increase in temperature.

[0040] The content of the linear α-olefin copolymer (B) is preferably 0.1% by mass or more, more preferably 1% by mass or more, based on the total amount of the resin composition, and is preferably 15% by mass or less, more preferably 10% by mass or less, which can suppress the increase in adhesive strength caused by temperature rise.

[0041] The total content of the 4-methyl-1-pentene polymer (A) and the linear α-olefin copolymer (B) is preferably 86% by mass or more, more preferably 90% by mass or more, even more preferably 95% by mass or more, and even more preferably 99% by mass or more, based on the total amount of the resin composition, which can suppress the increase in adhesive strength caused by temperature rise.

[0042] [Coloring agent] The resin composition may further include a colorant. The colorant is not particularly limited as long as it can color the resin sheet in a desired color, and a known colorant can be used. For example, the colorant may be one or more selected from dyes and pigments. The colorant may also be one contained in the resin composition as a component of the master batch. This makes it possible to color the resin sheet in a desired color while suppressing the increase in adhesive strength caused by temperature rise.

[0043] The dye is not particularly limited and any known dye can be used, including, for example, disperse dyes, reactive dyes, direct dyes, composite dyes, acid dyes, metal complex dyes, natural dyes, sulfur dyes, azo dyes, fluorescent dyes, dyes for resin coloring, and other functional dyes. These may be used alone or in combination of two or more.

[0044] The pigment is not particularly limited and any known pigment can be used, and examples thereof include organic pigments such as extender pigments, white pigments, black pigments, gray pigments, red pigments, brown pigments, green pigments, blue pigments, purple pigments, metal powder pigments, luminescent pigments, pearlescent pigments, inorganic pigments, and plastic pigments. These pigments may be used alone or in combination of two or more.

[0045] The content of the colorant is preferably 0.05% by mass or more, more preferably 0.1% by mass or more, based on the total amount of the resin composition, and may be 0.2% by mass or more from the viewpoint of increasing the color concentration of the resin sheet. On the other hand, the content of the colorant is preferably 1.5% by mass or less, more preferably 1.0% by mass or less, and further preferably 0.7% by mass or less, based on the total amount of the resin composition.

[0046] When the resin sheet has a multi-layer structure, the colorant may be a resin composition in which some of the layers contain the colorant.

[0047] [Other ingredients] The resin composition according to the present embodiment may contain components other than the 4-methyl-1-pentene polymer (A), the linear α-olefin copolymer (B), and the colorant, as necessary, within a range that does not impair the effects of the present invention. Furthermore, each of these components may be used alone, or may be used as a compound with other components (for example, a master batch, etc.).

[0048] The resin composition according to the present embodiment may contain additives such as a foaming agent, a foaming modifier, a heat stabilizer, an antioxidant, an ultraviolet absorber, a pigment, an antistatic agent, a copper damage inhibitor, a flame retardant, a neutralizing agent, a plasticizer, a nucleating agent, a weather resistance stabilizer, a light resistance stabilizer, an antiaging agent, a fatty acid metal salt, a softener, a dispersant, a lubricant, a natural oil, a synthetic oil, and a wax.

[0049] (foaming agent) The foaming agent includes chemical foaming agents and physical foaming agents. Examples of chemical foaming agents include sodium bicarbonate, ammonium bicarbonate, various carboxylates, sodium borohydride, azodicarboxamide, N,N-dinitrosopentamethylenetetramine, P,P-oxybis(benzenesulfonyl hydrazide), azobisisobutyronitrile, paratoluenesulfonyl hydrazide, and sodium hydrogen carbonate. The physical foaming agent may be carbon dioxide, nitrogen, or a mixture of carbon dioxide and nitrogen, any of which may be supplied in a gaseous, liquid or supercritical state.

[0050] <Method of manufacturing resin sheet> The resin sheet of this embodiment can be produced by mixing or melt-kneading the raw material 4-methyl-1-pentene polymer (A) and any other components by a known method such as dry blending, a tumbler mixer, a Banbury mixer, a single screw extruder, a twin screw extruder, a high-speed twin screw extruder, or a heat roll to prepare a resin composition, and extruding the resin composition into a sheet by a known method. The extruded sheet is cooled by a cooling roll and taken up by a take-up machine.

[0051] The method for producing a colored resin sheet may include, for example, a step of mixing the 4-methyl-1-pentene polymer (A) and a master batch to prepare the resin composition. In this case, the 4-methyl-1-pentene polymer (A) is used as a diluting resin for the master batch.

[0052] The masterbatch is a pellet-shaped resin composition containing a high concentration of a colorant such as a pigment, and is used to color a resin molded body in a desired color. By using the masterbatch, the colorant can be easily dispersed uniformly in the resin molded body. Usually, the masterbatch is kneaded with a diluent resin, which is the main component of the resin molded body, and then processed into a desired resin molded body.

[0053] Examples of the resin (base resin) contained in the master batch include polyolefin resins such as polyethylene resin and polypropylene resin, polystyrene resin, acrylonitrile-butadiene-styrene (ABS) resin, polycarbonate resin, polyamide resin, polyester resin, polybutylene terephthalate resin, and thermoplastic resins such as polymethyl methacrylate resin (PMMA). These may be used alone or in combination of two or more. Among these, polyolefin resin and acrylonitrile-butadiene-styrene (ABS) resin are preferred, and polyethylene resin and polypropylene resin are more preferred.

[0054] When the 4-methyl-1-pentene polymer (A) is used as a dilution resin for the masterbatch, the masterbatch can be produced, for example, by the following method. The master batch can be produced by mixing or melt-kneading the raw material colorant, diluent resin, and other optional components using a known method such as dry blending, a tumbler mixer, a Banbury mixer, a single-screw extruder, a twin-screw extruder, a high-speed twin-screw extruder, or a heated roll.

[0055] Examples of the method for foaming the resin sheet include the following methods. When a chemical foaming agent is used, a resin composition other than the chemical foaming agent is charged into an extruder together with the chemical foaming agent, and the mixture is mixed uniformly, and then foamed while being extruded into a sheet. In addition, when carbon dioxide is used as a physical foaming agent, a method can be mentioned in which the resin composition is charged into an extrusion molding machine, kneaded in the extrusion molding machine, and after the resin composition is plasticized, carbon dioxide is directly injected into the extrusion molding machine to foam the resin composition while extruding it into a sheet.

[0056] The method for forming the resin sheet into a multi-layer structure is not particularly limited, and any known method can be used.

[0057] 2. Pieces and Piece Sets The pieces of the present embodiment are obtained by cutting the above-mentioned resin sheet to a predetermined size. The cutting method is not particularly limited, and any known method can be used. The size of the piece is not particularly limited, but it is preferably about the same as the palm of the hand, so that the piece can be held in the hand and warmed by the body heat to exhibit flexibility and adhesiveness.The shape of the piece is not particularly limited, and can be a wide variety of shapes, such as a circle, an ellipse, a triangle, a rectangle, a polygon, a cross, an animal or plant shape, and a star shape.In addition, it is preferable to make the corners rounded, so that the piece can be easily felt to be soft and gentle when viewed or held in the hand, and to easily suppress delamination.

[0058] Moreover, the piece set of this embodiment has a plurality of such pieces and is used as a toy. When the pieces of this embodiment are touched by a person and warmed to about 25°C to 40°C, their flexibility and adhesiveness are increased. Therefore, when applied to a toy, children, elderly people, etc. warm the pieces of this embodiment with their hands to increase their adhesiveness and flexibility, so that the pieces can be easily attached to each other, assembled, and freely deformed. Furthermore, even if the pieces of this embodiment are attached to each other, they can be easily peeled off by children or elderly people. On the other hand, when the pieces are cooled, their flexibility decreases, the shape is maintained, and the adhesiveness also decreases, so that the pieces naturally peel off from each other. Furthermore, since the pieces of this embodiment have good designability, it is possible to form a shape with a higher designability.

[0059] The number of pieces is not particularly limited and may be several tens to several hundreds. The pieces may have the same shape, size, and design. The pieces may be different from each other or may have parts that differ from each other. In other words, the pieces may include at least two or more pieces that have the same shape and / or the same design.

[0060] The method of storing the piece set is not particularly limited. For example, a partition or sheet may be used to prevent the pieces from overlapping each other, but the pieces of the present embodiment may be stored overlapping each other because the increase in adhesive force accompanying an increase in temperature is suppressed. In other words, even if the pieces are stored overlapping each other at high temperatures, the pieces can be prevented from strongly adhering to each other during use.

[0061] Although the embodiments of the present invention have been described above, these are merely examples of the present invention, and various configurations other than those described above may also be adopted. Furthermore, the present invention is not limited to the above-described embodiments, and modifications and improvements within the scope of the present invention are included in the present invention. EXAMPLES

[0062] 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.

[0063] (1) Raw materials 4-Methyl-1-pentene polymer (A1): Copolymer of 4-methyl-1-pentene and propylene (content of 4-methyl-1-pentene-derived structural unit (a1): 72 mol%, content of propylene-derived structural unit (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 4-methyl-1-pentene-derived structural unit (a1): 85 mol%, content of propylene-derived structural unit (a2): 15 mol%) Glass transition temperature: 40°C, MFR: 10g / 10min, melting point: 130°C Master batch 1: Master batch 1 was prepared by a conventional method using 20 parts by mass of "4-methyl-1-pentene polymer (A2)" as a base resin and 1 part by mass of pigment (CI Pigment White 6). Masterbatch 2: Masterbatch 2 was prepared by a conventional method using 20 parts by mass of "Prime Polypro F327, manufactured by Prime Polymer Co., Ltd. (random polypropylene)" as the base resin and 1 part by mass of pigment (CI Pigment White 6). Masterbatch 3: Resin Masterbatch 3 was prepared by a conventional method using 20 parts by mass of "Evolu SP2040, manufactured by Prime Polymer Co., Ltd. (linear low-density polyethylene)" as the base resin and 1 part by mass of pigment (CI Pigment White 6).

[0064] (2) Preparation of resin sheet <Example 1> The molding machine used was a device equipped with a single-screw extruder (cylinder inner diameter D: 20 mm, full-flight screw, L / D: 28 mm when L is the effective screw length), a T-die (die width: 300 mm, lip opening: 0.4 to 1.0 mm), a cooling roll (outer diameter 200 mm, made of steel with mirror-finished hard chrome plating surface treatment, water-cooled), and a take-up machine. First, the raw materials were dry-blended in the proportions shown in Table 1 (the units in the table are parts by weight), and the resulting mixture was placed in a hopper. The raw material components were melted and kneaded under conditions of a temperature of 140-230°C in each part of the cylinder and a screw rotation speed of 70-80 rpm, and extruded from a T-die to give an extrusion rate of 1.5-2.5 kg / hour. The extruded sheet-like mixture was cooled on a cooling roll (water passing through the roll interior temperature: 20°C) and taken up using a take-up machine (take-up speed: 0.3-0.5 m / min) to obtain a resin sheet with a sheet width of approximately 270 mm.

[0065] <Examples 2 to 11, Comparative Example 1> A resin sheet was obtained under the same processing conditions as in Example 1, except that the raw materials and raw material compositions were changed to those shown in Table 1.

[0066] (3) Evaluation and measurement The resin sheets of the examples obtained in (2) above were used to carry out the following evaluations and measurements. The results are shown in Table 1.

[0067] [Condition i] Two resin sheets were cut into strips of 100 mm in length and 50 mm in width, and a test piece was prepared so that the MD direction of the two resin 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 test pieces were then pressed at 40°C for 24 hours. The pressed test pieces were cut to a size of 100 cm in length and 25 mm in width, and the 180° peel strength between the resin sheets was measured. The 180° peel strength test conditions were chuck distance: 30 mm, tensile speed: 300 mm / min, peel direction: 180°, temperature: 23°C, and number of measurement points n=3. The peel strength (N / 25 mm) was measured and the average value was calculated.

[0068] [Condition ii] The peel strength (N / 25 mm) was measured in the same manner as in condition i, except that the standing condition after compression was changed to 30° C. for 1 hour, and the average value was calculated.

[0069] [Peelability] The environmental temperature was set to 23° C., and each of the laminates (two resin sheets) obtained under condition i and condition ii was peeled off by hand and evaluated according to the following criteria. A: The resin sheet did not stretch and could be easily peeled off. B: The resin sheet was stretched and peeled off. C: The resin sheet was welded and could not be peeled off.

[0070] [Colorability] The colored resin sheet was visually inspected and evaluated according to the following criteria as to whether or not it was uniformly colored. A: Uniform coloring C: Unable to color evenly

[0071] [Table 1]

Claims

1. A resin sheet made of a resin composition containing a 4-methyl-1-pentene polymer (A), The 4-methyl-1-pentene polymer (A) has a structural unit (a1) derived from 4-methyl-1-pentene and a structural unit (a2) derived from a linear α-olefin having 2 to 3 carbon atoms, A resin sheet that satisfies the following condition i. Condition i: Two of the resin sheets were subjected to a pressure of 0.4 N / cm at 40° C. for 24 hours. ２ The 180° peel strength of a laminate having a size of 100 cm×25 mm after pressure bonding is 0.5 N / 25 mm or more and 20 N / 25 mm or less.

2. The resin sheet according to claim 1, The 4-methyl-1-pentene polymer (A) contains a 4-methyl-1-pentene polymer (A1) and a 4-methyl-1-pentene polymer (A2), The 4-methyl-1-pentene polymer (A1) contains 60 mol % or more and 80 mol % or less of structural units (a1) derived from 4-methyl-1-pentene and 20 mol % or more and 40 mol % or less of structural units (a2) derived from linear α-olefins having 2 to 3 carbon atoms; The 4-methyl-1-pentene polymer (A2) contains more than 80 mol % and not more than 95 mol % of structural units (a1) derived from 4-methyl-1-pentene, and contains 5 mol % or more and less than 20 mol % of structural units (a2) derived from a linear α-olefin having 2 to 3 carbon atoms.

3. The resin sheet according to claim 2, Relative to the total amount of 4-methyl-1-pentene polymer (A), The 4-methyl-1-pentene polymer (A1) is 80% by mass or more and 99% by mass or less, A resin sheet comprising a 4-methyl-1-pentene polymer (A2) in an amount of 1% by mass or more and 20% by mass or less.

4. The resin sheet according to claim 1 or 2, The resin sheet comprises a 4-methyl-1-pentene polymer (A) in an amount of 85 mass% or more based on the total amount of the resin composition.

5. The resin sheet according to claim 1 or 2, The resin sheet, wherein the resin composition further contains a linear α-olefin copolymer (B) having 2 to 10 carbon atoms.

6. The resin sheet according to claim 1 or 2, The resin sheet, wherein the resin composition further contains a colorant.

7. The resin sheet according to claim 6, The resin sheet has a content of the colorant of 0.05% by mass or more and 1.5% by mass or less with respect to a total amount of the resin composition.

8. The resin sheet according to claim 1 or 2, A single layer resin sheet.

9. 3. A piece obtained by cutting the resin sheet according to claim 1 or 2 to a predetermined size.

10. A piece set comprising a plurality of pieces according to claim 9 and used as a toy.

11. A method for producing the resin sheet according to claim 1 or 2, A method for producing a resin sheet, comprising: mixing a 4-methyl-1-pentene polymer (A) with a master batch to prepare the resin composition.

Images