Laminated films and chemical protective gloves

Abstract

To obtain a laminated film that has excellent chemical resistance, as well as excellent flexibility and fit when worn. [Solution] The invention comprises a sealant material, a substrate located on one side of the sealant material, and an intermediate material located between the sealant material and the substrate, wherein the material of the sealant material is a polyolefin resin, the heat ratio of the endothermic peaks originating from the β' crystal to the total heat of the endothermic peaks of the sealant material is 2.0% or more, the substrate is an unstretched film of a polyamide resin, and the intermediate material is an unstretched film of an ethylene-vinyl alcohol polymer.

Description

[Technical Field]

[0001] This invention relates to laminated films and chemical protective gloves. [Background technology]

[0002] Chemical protective gloves are used when handling acids, alkalis, organic chemicals, and other gaseous, liquid, or particulate chemical substances (hereinafter simply referred to as "chemical substances"). Chemical protective gloves are intended to prevent the permeation and penetration of chemical substances, and their quality is defined in JIS T8116:2005. For example, Patent Document 1 proposes a laminated film in which a resin layer having at least one layer containing 90% by mass or more of an ethylene-vinyl alcohol copolymer and at least one layer made of a resin with a melting point of 160°C or higher is laminated with a fiber layer, and the breakthrough time in methanol is 120 minutes or more. According to the invention described in Patent Document 1, excellent permeability resistance to alcohols and the like is achieved not only to a limited number of chemical substances. [Prior art documents] [Patent Documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2005-60869 [Overview of the project] [Problems that the invention aims to solve]

[0004] Laminated films used in chemical protective gloves and similar products require not only chemical resistance but also a good fit and flexibility when worn. Therefore, the present invention aims to provide a laminated film that is excellent in chemical resistance, flexibility, and fit when worn. [Means for solving the problem]

[0005] Polyolefins are known to have two crystal structures: α-crystal (also called monoclinic) and β-crystal (also called hexagonal). The β-crystal includes the β'-crystal (also called β-prime crystal, pseudo-hexagonal crystal, or smetic crystal), which is derived from the β-crystal. As a result of diligent research, the inventors have discovered that by using a polyolefin resin containing β' crystals as a sealant material, and by combining a polyamide-based substrate and the sealant material via an intermediate layer of ethylene-vinyl alcohol polymer, it is possible to improve the fit and flexibility when worn while maintaining excellent chemical resistance, thus completing the present invention. In other words, the laminated film of the present invention has the following configuration.

[0006] <1> The material comprises a sealant material, a base material located on one side of the sealant material, and an intermediate material located between the sealant material and the base material. The material of the sealant is a polyolefin resin. The sealant material has a heat ratio of 2.0% or more of the endothermic peaks originating from the β' crystal to the total heat of the endothermic peaks of the sealant material. The substrate is an unstretched film of a polyamide resin. The aforementioned intermediate material is a laminated film, which is an unstretched film of an ethylene-vinyl alcohol polymer. <2> An adhesive resin layer is located between the sealant material and the intermediate material. The adhesive resin layer is an acid-modified polyolefin. <1> The laminated film described above. <3> The ethylene content of the aforementioned intermediate material is 40 mol% or less. <1> or <2> The laminated film described above. <4> The material of the sealant has a density of 0.930 g / cm³. 3 The following are low-density polyethylenes: <1> ~ <3> A laminated film as described in any of the following. <5> It is a co-extruded laminate. <1> ~ <4> A laminated film as described in any of the following. <6> A chemical protective glove formed by molding the laminated film according to any one of <1> to <5>.

Advantages of the Invention

[0007] According to the laminated film of the present invention, it has excellent chemical resistance, flexibility, and a good fit when worn.

Brief Description of the Drawings

[0008] [Figure 1] It is a cross-sectional view of a laminated film according to an embodiment of the present invention. [Figure 2] It is an example of a DSC curve. [Figure 3] It is an example of a DSC curve.

Modes for Carrying Out the Invention

[0009] (Laminated Film) The laminated film of the present invention has a sealant material, a base material located on one surface of the sealant material, and an intermediate material located between the sealant material and the base material. That is, the laminated film of the present invention has the sealant material, the intermediate material, and the base material in this order.

[0010] The laminated film according to an embodiment of the present invention will be described with reference to the drawings. [[ID=​​​​​​​​​​The thickness T1 of the laminated film 1 is not particularly limited, but for example, 30 to 300 μm is preferred, 40 to 120 μm is more preferred, and 50 to 80 μm is even more preferred. If the thickness T1 is above the lower limit, the mechanical strength (pinhole resistance, impact resistance, etc.) of the laminated film 1 can be increased. If the thickness T1 is below the upper limit, the flexibility of the laminated film 1 can be increased, and the fit when worn can be increased. "Fit when worn" refers to the fit when the laminated film 1 is used as chemical protective equipment such as chemical protective gloves (including inner gloves) and is worn. The thickness is the average value of 10 randomly measured points, for example, using a thickness gauge.

[0012] The modulus value of the laminated film 1 is preferably 500 to 700 MPa or less, and more preferably 500 to 600 MPa. If the modulus value is above the lower limit, it has appropriate rigidity and can be handled more easily. If the modulus value is below the upper limit, it has greater flexibility and can be fitted more comfortably.

[0013] <Base material> The base material 10 is made of a polyamide resin. When the laminated film 1 is used as a chemical protective material, the base material 10 becomes the outermost layer. The laminated film 1 exhibits excellent chemical resistance by combining the polyamide resin base material 10 with a specific sealant material 40. The chemicals to be protected from include organic solvents.

[0014] Polyamide resins are resins whose main component is polyamide. The proportion of polyamide to the total mass of the resin in the polyamide resin is 50% by mass or more, preferably 75% by mass or more, more preferably 90% by mass or more, and even more preferably substantially 100% by mass. "Substantially 100% by mass" means a configuration in which other resins are included to an extent that does not affect the effects of the present invention.

[0015] The polyamide may be n-nylon or n,m-nylon. 6-nylon is preferred as the polyamide.

[0016] The base material 10 may contain additives. Examples of additives include AB agents and lubricants. The content of the additives is, for example, 0.02 to 5.0% by mass of the total mass of the base material 10.

[0017] The base material 10 is an unoriented film. Using an unoriented film for the base material 10 enhances the flexibility of the laminated film 1. The base material 10 may be a single layer or a multilayer material of two or more layers.

[0018] Thickness T of base material 10 10 The thickness is preferably 5 to 30 μm, more preferably 5 to 20 μm, and even more preferably 5 to 15 μm. 10 If the thickness T is above the lower limit mentioned above, chemical resistance and mechanical strength can be further enhanced. 10 If the value is below the above upper limit, flexibility can be further increased, and the fit when worn can be improved.

[0019] <Sealant material> The sealant material 40 is made of a polyolefin resin. The laminated film 1 exhibits excellent chemical resistance by combining a polyamide resin base material 10 with the sealant material 40. In addition, the laminated film 1 can be made more flexible and have a better fit when installed by combining the sealant material 40 with a specific intermediate material 20.

[0020] Polyolefin resins are resins whose main component is polyolefin. The proportion of polyolefin to the total mass of the resin in the polyolefin resin is 50% by mass or more, preferably 75% by mass or more, more preferably 90% by mass or more, and even more preferably substantially 100% by mass.

[0021] Examples of polyolefins include polyethylene and polypropylene, with polyethylene being preferred, low-density polyethylene (LDPE) being more preferred, and linear low-density polyethylene (LLDPE) being even more preferred. The density of polyolefins is 0.930 g / cm³. 3The following is preferable: 0.890 to 0.920 g / cm³ 3 This is preferable.

[0022] The sealant material 40 may contain additives. Examples of additives include β-crystal nucleating agents, AB agents, and lubricants. The amount of additives is, for example, 0.02 to 5.0% by mass of the total mass of the sealant material 40.

[0023] Examples of β-crystal nucleating agents include sorbitol and phosphate ester metal salts. The content of the β-crystal nucleating agent is, for example, 0.05 to 5.0% by mass relative to 100% by mass of the resin in the sealant material 40.

[0024] The sealant material 40 may be an unoriented film, a uniaxially oriented film, or a biaxially oriented film, but an unoriented film is preferred. An unoriented film allows for greater flexibility. The sealant material 40 may be a single layer or a multi-layer material of two or more layers.

[0025] When the sealant material 40 is subjected to calorimetry using a differential scanning calorimetry device (hereinafter also referred to as a "DSC device"), endothermic peaks at the melting points of the crystals (α-crystal, β-crystal, β'-crystal) of the sealant material 40 are observed. The melting points of the β crystal (105-115°C) and the β' crystal (100-110°C) are lower than those of the α crystal (115-120°C). When the sealant material 40 having a β' crystal is treated at a high temperature (for example, above 80°C), the β' crystals undergo a transformation to an α crystal state. Thus, by observing the endothermic peak in the DSC curve obtained through differential scanning calorimetry (DSC measurement), the formation of β' crystals can be determined.

[0026] For example, in the DSC curve shown in Figure 2, curve C1 shows only one endothermic peak at 122.89°C, which is an endothermic peak originating from the melting point of the α-crystal. On the other hand, in the case of the DSC curve shown in Figure 3, curve C2 branches into two points: 109.65°C and 122.31°C. The endothermic peak at 122.31°C observed on the high-temperature side is thought to be an endothermic peak originating from the melting point of the α-crystal. The endothermic peak at 109.65°C observed on the low-temperature side is thought to be an endothermic peak originating from the melting point of the β'-crystal. In this specification, if an endothermic peak observed in the DSC curve is not an endothermic peak originating from the melting point of the α-crystal, that endothermic peak will be determined to be an endothermic peak originating from the melting point of the β'-crystal.

[0027] The measurement conditions for DSC are as follows: Endothermic peaks are observed from the DSC curve obtained during the first heating cycle. The heat ratio of each endothermic peak is determined using the analysis software of the DSC instrument based on the area of ​​each endothermic peak. The heat ratio of each endothermic peak is the average value obtained from two DSC measurements of the same sample. (Measuring device) • Differential scanning calorimetry (DSC) device: Differential scanning calorimetry, DSC-60Plus (manufactured by Shimadzu Corporation). (Measurement conditions) Sample quantity: 5.5 ± 0.5 mg. • Reference (alumina) amount: 5 mg. Nitrogen gas flow rate: 20 mL / min. • Number of tests: 2. • First heating conditions: Heat from 40°C to 200°C at a heating rate of 10°C / min. ·Holding time: 0min. • Conditions for the first cooling test: Cooling from 200°C to 50°C at a rate of -10°C / min. Second heating conditions: Heat from 50°C to 200°C at a heating rate of 10°C / min. ·Holding time: 0min. Second cooling conditions: Cool from 200°C to 50°C at a cooling rate of -10°C / min.

[0028] In the sealant material 40, the ratio of the endothermic peak of the β' crystal to the total endothermic peak of the sealant material 40 measured by a DSC device (β' calorific ratio) is 2% or more, preferably 5% or more. When the β' calorific ratio in the sealant material 40 is above the above lower limit, chemical resistance, flexibility, and fit during installation can be improved. When a chemical substance comes into contact with laminated film 1, the chemical substance penetrates the resin. As the chemical substance penetrates the resin, the entanglement of the resin molecular chains loosens, reducing intermolecular forces. The molecular chains are then stretched in the direction of the stress, leading to molecular orientation and fibrillation. Molecular orientation and fibrillation cause stress crazing (micropores). However, if a β' crystal (smetica crystal) is present, the β' crystal acts to suppress molecular orientation and fibrillation, thereby preventing the occurrence of strict crazing. The upper limit of the β' calorific value ratio in the sealant material 40 is preferably 40% or less, more preferably 30% or less, and even more preferably 10% or less. When the β' calorific value is below the above upper limit, the mechanical strength can be further increased. The β' calorific value ratio can be adjusted by the type, amount, and degree of stretching of the β-nucleating agent, the cooling conditions during film formation, aging, and combinations thereof. The total heat energy of the endothermic peak is the sum of the α-caloric ratio and the β-caloric ratio, which will be discussed later.

[0029] The sealant material 40 may contain β crystals. The calorific value ratio of β crystals including β' crystals (β calorific value ratio) is, for example, 2% or more, and preferably 5% or more. When the β calorific value ratio in the sealant material 40 is above the above lower limit, chemical resistance, flexibility, and fit during installation can be improved. The upper limit of the β-calorific value ratio in the sealant material 40 is preferably 40% or less, more preferably 30% or less, and even more preferably 10% or less. When the β-calorific value is below the above upper limit, the mechanical strength can be further increased. Furthermore, the ratio of the β' calorific value to the β calorific value ratio in the sealant material 40 is preferably 30% or more, more preferably 40% or more, and may be 100%.

[0030] In the sealant 40, the heat quantity ratio of the α crystal heat absorption peak (α heat quantity ratio) to the total heat quantity of the heat absorption peak of the sealant 40 measured by a DSC device is preferably 60% or more, more preferably 70% or more, and even more preferably 75% or more. When the α heat quantity ratio in the sealant 40 is at or above the above lower limit value, the rigidity can be increased. The upper limit of the α heat quantity ratio in the base material 10 is preferably, for example, 99% or less, and more preferably 95% or less. When the α heat quantity ratio is at or below the above upper limit value, the chemical resistance, solvent resistance, and pinhole resistance can be further enhanced. The α heat quantity ratio can be adjusted by the type and amount of the β crystal nucleating agent, the degree of stretching, the cooling conditions during film formation, aging, and combinations thereof.

[0031] The thickness T of the sealant 40 40 is determined in consideration of the material, configuration, etc. For example, 5 to 50 μm is preferable, 10 to 40 μm is more preferable, and 20 to 30 μm is even more preferable. When the thickness T 40 is at or above the above lower limit value, the sealing property of the laminated film 1 can be further enhanced. When the thickness T 40 is at or below the above upper limit value, the transparency of the laminated film 1 can be further enhanced.

[0032] <Intermediate material> The intermediate material 20 is made of ethylene-vinyl alcohol copolymer (EVOH). By having the intermediate material 20, the laminated film 1 has increased flexibility and a better fit feeling during installation.

[0033] The content of EVOH is substantially 100% by mass based on the total mass of the resin of the intermediate material 20. The ethylene content of the intermediate material 20 is preferably 40 mol% or less, more preferably 38 mol% or less, and even more preferably 35 mol% or less. When the ethylene content of the intermediate material 20 is at or below the above upper limit value, the chemical resistance can be further enhanced. The lower limit value of the ethylene content of the intermediate material 20 is preferably 20 mol% or more, and more preferably 22 mol% or more. When the ethylene content of the intermediate material 20 is at or above the above lower limit value, the water resistance and chemical resistance (especially alcohol resistance) can be further enhanced. The ethylene content of intermediate material 20 is measured in accordance with ISO 14663-2:1999 "Plastics - Ethylene / vinyl alcohol (EVOH) copolymer molding and extrusion materials Part 2: Preparation and characterization of test specimens".

[0034] The intermediate material 20 may contain additives. Examples of additives include β-crystal nucleating agents, AB agents, and lubricants. The content of the additives is, for example, 0.02 to 5.0% by mass of the total mass of the intermediate material 20.

[0035] The intermediate material 20 is an unoriented film. Using an unoriented film for the intermediate material 20 increases the flexibility of the laminated film 1. The intermediate material 20 may be a single layer or a multi-layer material of two or more layers.

[0036] Thickness T of the intermediate material 20 20 The thickness T is determined considering the material and composition, for example, 5 to 50 μm is preferred, 10 to 40 μm is more preferred, and 20 to 30 μm is even more preferred. 40 If the thickness T is greater than or equal to the lower limit mentioned above, the sealing performance of the laminated film 1 can be further improved. 40 If the value is below the above upper limit, the transparency of the laminated film 1 can be further improved.

[0037] <Adhesive resin layer> The adhesive resin layer 30 is a cured adhesive. The presence of the adhesive resin layer 30 allows for a strong bond between the sealant material 40 and the intermediate material 20. As the material for the adhesive resin layer 30, acid-modified polyolefin is preferred, and maleic acid-modified polyolefin is more preferred.

[0038] Thickness T of the adhesive resin layer 30 30 The thickness is preferably 10 μm or less, and more preferably 8 μm or less. 30 If the above upper limit is below this value, the thickness T1 can be reduced, increasing flexibility and lowering the environmental impact. Thickness T 30 The lower limit is, for example, 1.0 μm or more. Thickness T 30If the value is above the lower limit mentioned above, the sealant material 40 and the intermediate material 20 can be joined more firmly.

[0039] (Method of manufacturing laminated film) The following describes an example of a method for manufacturing the laminated film 1. The manufacturing method for the laminated film 1 of this embodiment includes, for example, a method of manufacturing by co-extrusion (co-extrusion method), a method of obtaining a base material 10, an intermediate material 20, and a sealant material 40, stacking the base material 10, intermediate material 20, adhesive, and sealant material 40 to form a laminate, and joining each layer. Among these, the co-extrusion method is preferred as the manufacturing method for the laminated film 1. That is, the laminated film 1 is preferably a co-extruded laminate. By manufacturing the laminated film 1 by co-extrusion, the thickness T1 can be reduced, the amount of resin used can be reduced, and the environmental burden can be reduced. In addition, the laminated film 1 manufactured by co-extrusion has increased flexibility, which improves the fit when worn.

[0040] The manufacturing method of the laminated film 1 in this embodiment may include an aging step. Including an aging step can reduce the β' calorific value ratio of the sealant material 40. The aging process involves holding the resulting laminated film 1 at a specified temperature. The aging time (heating time) is, for example, 1 to 72 hours.

[0041] The manufacturing method of the laminated film 1 in this embodiment may include a printing step. By including a printing step, a printed layer can be formed on the laminated film 1. The printing method is not particularly limited, and various printing methods such as offset printing, gravure printing, flexographic printing, screen printing, and inkjet printing can be used. The object to be printed on may be the substrate 10 or the sealant material 40.

[0042] <Application> The laminated film 1 has a sealant material 40 and a base material 10, so it can prevent the permeation and penetration of chemical substances (high chemical resistance). In addition, the laminated film 1 has an EVOH intermediate material 20, as the base material and intermediate material are unstretched films, and it has excellent flexibility and a good fit when worn. Therefore, the laminated film 1 is suitable for chemical protective gloves and chemical protective clothing. In particular, the laminated film 1 is especially suitable for pevalab chemical protective gloves because it offers excellent fit and can be made thin.

[0043] (Other embodiments) Although the above-described embodiment has a four-layer structure, the present invention is not limited thereto. The laminated film of the present invention may have three layers: a sealant material, a substrate located on one side of the sealant material, and an intermediate material located between the sealant material and the substrate. Furthermore, the laminated film may consist of five or more layers. For example, a second substrate may be positioned between the intermediate material 20 and the adhesive resin layer 30 in the laminated film 1 shown in Figure 1. The material of the second substrate is the same as the material of the substrate 10. The thickness of the second substrate is the same as the thickness T of the substrate 10. 10 It is similar to that. [Examples]

[0044] The present invention will be described below with reference to examples, but the present invention is not limited to the following examples.

[0045] (Materials used) <Base material> • Polyamide: Nylon-6 (Ny) pellets, trade name "UBE Nylon", manufactured by UBE. • Polyester: Polybutylene terephthalate (PBT) pellets, product name "Novaduran", manufactured by Mitsubishi Engineering Plastics Corporation. • 15μBO-Ny: Biaxially oriented nylon film, 15μm thick, product name "Santonil", manufactured by Mitsubishi Chemical Corporation.

[0046] <Intermediate material> • Ethylene-vinyl alcohol polymer: Ethylene-vinyl alcohol polymer (EVOH) pellets, ethylene content = 32 mol%, product name "EVAL", manufactured by Kuraray Co., Ltd. • 15μBO-EVOH: Biaxially oriented ethylene-vinyl alcohol polymer film, 5μm thick, ethylene content = 32 mol%, trade name "EVAL", manufactured by Kuraray Co., Ltd.

[0047] <Sealant material> • LLDPE*1: Linear low-density polyethylene pellets, monopolymer, trade name "Evolue", manufactured by Prime Polymer Co., Ltd. • LLDPE*2: Linear low-density polyethylene pellets, comonomer = octen-1, trade name "Novatec LL", manufactured by Nippon Polyethylene Co., Ltd. • LDPE: Low-density polyethylene pellets, product name "Suntech LD", manufactured by Asahi Kasei Corporation. • Polyolefin: Polypropylene (PP) pellets, product name "Novatec PP", manufactured by Nippon Polypropylene Co., Ltd. • 30μLLDPE: Linear low-density polyethylene film, 30μm thick, product name "Rix", manufactured by Toyobo Co., Ltd.

[0048] <Adhesive resin layer> • Adhesive resin: Maleic acid-modified polyethylene (AD*c), product name "Modic PE", manufactured by Mitsubishi Chemical Corporation. • Adhesive resin: Maleic acid-modified polypropylene (AD*d), product name "Modic PP", manufactured by Mitsubishi Chemical Corporation. • DLA: Urethane (PU) adhesive, product name "TM569", manufactured by Toyo Morton Co., Ltd.

[0049] (Evaluation method) <Chemical resistance> Each example of the laminated film was immersed in acetone, acetonitrile, dichloromethane, diethylamine, ethyl acetate, n-hexane, methanol, tetrahydrofuran, and toluene for 480 minutes, and the surface of the laminated film was observed using a scanning electron microscope. The observed results were evaluated according to the evaluation criteria below.

[0050] ≪Evaluation Criteria≫ ◎: No stress crazing occurred in any of the organic solvents. ○: Stress crazing occurs almost never with any organic solvent (compliant with JIS T8116:2005 standards). △: Slight occurrence of stress craving is observed. ×: Stress crazing was observed in some or all of the organic solvents.

[0051] <Pinhole resistance (Gelbot test)> The gelbo test was performed using a gelboflex tester (manufactured by Rigaku Kogyo Co., Ltd., MIL-B131H). Under conditions of 23°C and 65% relative humidity, a 21cm x 29cm laminated film was subjected to a 400° twist with a 3-inch (7.62cm) stroke using the gelboflex tester. This reciprocating motion was repeated 500 times at a speed of 40 times per minute (40 times / min). Afterward, pinholes in the laminated film were observed and evaluated according to the evaluation criteria below.

[0052] ≪Evaluation Criteria≫ ◎: The number of pinholes was 0 in 500 gel tests. ○: The number of pinholes observed was 1 to 2 in 500 gel tests. ○: The number of pinholes was 3 or more in 500 gel tests.

[0053] <Impact resistance> The laminated films obtained in each example were heat-sealed (sealing temperature: 180°C, sealing time: 1 second, sealing pressure: 3.5 kg / cm²). 2, with a seal width of 10 mm, a three-sided sealed bag (flat bag) of 130 mm × 170 mm was produced. 180 mL of water was filled into this flat bag, and the opening was heat-sealed under the same conditions as above to obtain a sample for evaluation. This sample for evaluation was dropped vertically from a height of 1.2 m onto the concrete surface, and this operation was repeated 3 times (drop strength test). Among the 10 samples for evaluation, the number of samples in which leakage of the contents was observed (number of broken bags) was counted, and the impact resistance was evaluated based on the following evaluation criteria. The results are shown in Table 1B. 《Evaluation Criteria》 ◎: The number of broken bags is 0. ○: The number of broken bags is 1 or 2. ×: The number of broken bags is 3 or more.

[0054] <Flexibility (Modulus Value)> For the laminated films of each example, the modulus value (MPa) was measured using a tensile testing machine. The results are shown in the table.

[0055] <Fitting Feeling> Using a loop stiffness tester (model number MODEL - 2256, manufactured by Aiko Engineering Co., Ltd.), the loop stiffness (crushing distance 7.0 mm) of the laminated film of each example was measured. The measured values were evaluated according to the following evaluation criteria.

[0056] ≪Evaluation Criteria≫ ◎: Less than 0.05 N. ○: 0.05 N or more and less than 0.09 N. △: 0.09 N or more and less than 1.20 N. ×: 1.20 N or more.

[0057] <JIS Compatibility> In accordance with JIS T8116:2005, the laminated films of each example were evaluated. In the table, those conforming to JIST8116 were marked as "◎", and those not conforming were marked as "×".

[0058] (Experimental Examples 1 - 5, Comparative Examples 1 - 4) According to the specifications and manufacturing conditions in Tables 1A and 1B, the pellets constituting each layer were co-extruded to obtain the laminated films shown in the "Laminated Structure" in the tables. The "Laminated Structure" in the table is described according to the standard method. For example, "6μNy / 6μEVOH / 8μNy / 6μAD / 24μLLDPE" in Example 1 is a base material (6μm thick Ny) / intermediate material (6μm thick EVOH) / second base material (8μm thick Ny) / adhesive resin layer (6μm thick maleic acid-modified polyethylene) / sealant material (24μm thick LLDPE). The obtained laminated films were subjected to measurements of the β' crystal structure of the sealant material, as well as evaluations of chemical resistance, pinhole resistance, impact strength, flexibility, fit, and JIS compliance. The results are shown in the table. For Comparative Examples 1-5, which did not conform to JIS T8116:2005, the evaluation of flexibility was omitted.

[0059] (Comparative Example 5) According to the layer configuration in Table 1A, 15μBO-Ny, 15μBO-EVOH, and 30μLLDP were bonded together with a urethane-based adhesive to obtain the laminated film in this example. The obtained laminated films were subjected to measurements of the β' crystal structure of the sealant material, as well as evaluations of chemical resistance, pinhole resistance, impact strength, flexibility, fit, and JIS compliance. The results are shown in the table.

[0060] [Table 1]

[0061] As shown in Tables 1A to 1B, Examples 1 to 5 to which the present invention was applied all received a "○" or "◎" rating in terms of chemical resistance, pinhole resistance, fit, and JIS compliance. Furthermore, the modulus values ​​for all examples were between 470 MPa and 520 MPa. Comparative Example 1, which used PBT as a base material and had a nylon layer instead of EVOH, was "×" for chemical resistance, fit, and JIS compliance, and "△" for pinhole resistance. Comparative Example 2, which used PBT as the base material, failed in chemical resistance, pinhole resistance, fit, and JIS compliance. Comparative Examples 3 and 4, in which the β' calorific value ratio of the sealant material was 0, showed chemical resistance of "×" to "△", and pinhole resistance, impact strength, fit, and JIS compliance of "×". Comparative Example 5, which used a biaxially oriented film as both the base material and intermediate material, received a "×" rating for pinhole resistance, impact strength, and fit. From the above results, it was confirmed that applying the present invention results in excellent chemical resistance, flexibility, and a comfortable fit when worn. [Explanation of Symbols]

[0062] 1. Laminated film 10 Base material 20 Intermediate material 30 Adhesive resin layer 40 Sealant material

Claims

1. The material comprises a sealant material, a base material located on one side of the sealant material, and an intermediate material located between the sealant material and the base material. The material of the sealant is a polyolefin resin. The sealant material has a heat ratio of 2.0% or more of the endothermic peaks originating from the β' crystal to the total heat of the endothermic peaks of the sealant material. The substrate is an unstretched film of a polyamide resin. The aforementioned intermediate material is a laminated film, which is an unstretched film of an ethylene-vinyl alcohol polymer.

2. An adhesive resin layer is located between the sealant material and the intermediate material. The laminated film according to claim 1, wherein the adhesive resin layer is an acid-modified polyolefin.

3. The laminated film according to claim 1, wherein the ethylene content of the intermediate material is 40 mol% or less.

4. The material of the sealant has a density of 0.930 g / cm³. ３ The laminated film according to claim 1, wherein the following low-density polyethylene is used.

5. The laminated film according to claim 1, which is a co-extruded laminate.

6. A chemical protective glove formed by molding a laminated film according to any one of claims 1 to 5.

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