Ethylenic resin composition

Abstract

To provide an ethylenic resin composition which enables production of a container that prevents occurrence of blocking and deformation such as large wrinkles even when being sterilized at 116°C or higher, is excellent in heat resistance, does not impair transparency, and is sanitary and excellent in content confirmability.SOLUTION: An ethylenic resin composition simultaneously satisfies the following Expressions (1) to (3). Expression (1): Ht≤0.0133×e0.0350×t. Expression (2): Ht≥0.0025×e0.0450×t, (provided that when a calculated value of a right side in Expression (1) exceeds 1, it is regarded to 1.) Expression (3): 110≤t≤130, (provided that in Expressions (1) to (3), t is a temperature (°C), and Ht is a melting component amount of a resin composition at a temperature t which is obtained by measuring an endothermic curve of the resin composition by a measurement method of an endothermic peak of DSC, determining a melting heat total amount ΔHm and a total amount ht of a melting heat amount from a melting start temperature t0°C to t°C, and is calculated by the following expression (4): Ht=ht / ΔHm.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to an ethylene-based resin composition used for manufacturing containers for medical or food applications, which are excellent in transparency and heat resistance. The present invention also relates to a container using the ethylene-based resin composition.

Background Art

[0002] In recent years, as containers for accommodating chemical solutions such as infusions, chemical solution containers made of flexible plastics have become mainstream. This type of chemical solution container has the advantages of being easy to handle and easy to dispose of. Since this type of chemical solution container is in direct contact with the chemical solution, those formed of polyolefins such as polyethylene and polypropylene, for which safety has been established, are widely used.

[0003] Patent Document 1 describes a heat-resistant container made of polyethylene that is excellent in moldability, has good hygiene and flexibility, and does not lose transparency even when sterilized at 115 °C or higher, and does not wrinkle or deform. However, in the examples, although there is a description of the deformation start temperature, the evaluation of HAZE is for the case of sterilization treatment at 115 °C for 30 minutes, and there is no evaluation of the HAZE when sterilized at 116 °C or higher. Also, since there is no evaluation of the transmittance at a wavelength of 450 nm by the ultraviolet-visible absorbance measurement method described in the first method of the transparency test of the sixteenth revised Japanese Pharmacopoeia, it is assumed that it does not satisfy the condition that sterilization is possible at 116 °C or higher and the transmittance at the maximum sterilizable temperature is 55% or more.

[0004] Patent Document 2 also lacks the evaluation of HAZE and transmittance in sterilization treatment at 116 °C or higher, similar to Patent Document 1. ​​​​​​​​​​​​​Evaluation has not been carried out, and it is assumed that it does not meet the conditions where sterilization is possible at 116°C or higher and the transmittance at the highest sterilizable temperature is 55% or higher.

[0005] Patent Document 3 describes a polyethylene bag that can withstand sterilization treatment at 118 to 121°C, but it features a multilayer structure and has not been implemented with a single-layer structure bag.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0007] In view of the above background art, the problem to be solved by the present invention is to obtain an ethylene-based resin composition that can be sterilized under high temperature conditions of 116°C or higher without deformation, blocking, large wrinkles, etc., and has excellent transparency, is hygienic, and allows easy confirmation of the contents.

Means for Solving the Problems

[0008] As a result of intensive studies to solve the above problems, the present inventors have found that an ethylene-based resin composition satisfying specific physical properties is suitable for manufacturing a container excellent in high-temperature sterilization resistance and transparency, and have completed the present invention.

[0009] That is, the present invention relates to the following [1] to [8]. [1] An ethylene resin composition that simultaneously satisfies the following formulas (1) to (3). H t ≦0.0133×e 0.0350×t Formula (1) H t ≧0.0025×e 0.0450×t Formula (2) (However, when the calculated value on the right side in Formula (1) exceeds 1, it is regarded as 1.) 110 ≦ t ≦ 130 Formula (3) (In Formulas (1) to (3), t represents the temperature (°C), H t is the heat absorption curve of the resin composition measured by the measurement method of the endothermic peak of a differential scanning calorimeter (DSC), and the total heat of fusion ΔH is measured, and the total heat of fusion h m from the melting start temperature t0 °C to t °C is obtained, and the following formula (4) h t is calculated by H t = h t / ΔH m Formula (4) and is the melting component amount of the resin composition at temperature t.) [2] The ethylene resin composition according to [1], which satisfies the following requirements (a) to (c). (a) The density measured in accordance with JIS K7112 is 900 kg / m 3 or more and 980 kg / m 3 or less (b) The melt flow rate (MFR) measured at 190 °C and a load of 2.16 kg in accordance with JIS K7210 is 0.01 g / 10 min or more and 50 g / 10 min or less (c) The maximum peak temperature (Tm) of the endothermic curve in a differential scanning calorimeter (DSC) is 116 °C or more (d) The transparency test of the sixteenth revision of the Japanese Pharmacopoeia after high-temperature sterilization treatment at 116 °C for 26 minutes [3] A container made of the ethylene resin composition according to [1] and [2] [4] After high-temperature sterilization treatment at 116 °C for 26 minutes, the transparency test of the sixteenth revision of the Japanese Pharmacopoeia ​The transmittance at a wavelength of 450 nm by the ultraviolet-visible absorbance measurement method described in the first transparency test method is 55% or more and the container according to [3]. [5] The container according to [3] or [4], wherein the average thickness of the body is 0.01 to 1.0 mm . [6] The container according to any one of [3] to [5], which has a single-layer structure . [7] The container according to any one of [3] to [6], which is for medical use or food use .

[0010] Even when sterilization is carried out under high temperature conditions of 116 °C or higher, the ethylene-based resin composition according to the present invention does not cause blocking or deformation such as large wrinkles in containers obtained from the resin composition . Moreover, the transmittance at a wavelength of 450 nm by the ultraviolet-visible absorbance measurement method described in the first transparency test method of the Japanese Pharmacopoeia sixteenth revision after sterilization is 55% or more . Since both excellent high-temperature sterilization resistance and transparency can be achieved, it is suitably used as a container for various applications . .

Brief Description of the Drawings

[0011]

Figure 1

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Figure 10

Embodiments for Carrying Out the Invention

[0012] Hereinafter, the ethylene-based resin composition according to the present invention and various uses of the resin composition will be described in detail. Explain.

[0013] The ethylene-based resin composition according to the present invention simultaneously satisfies the following formulas (1) to (3). It is characterized by the following. H t ≦0.0133×e 0.0350×t Formula (1) H t ≧0.0025×e 0.0450×t Formula (2) 110≦t≦130 Formula (3) However, when the calculated value on the right side in formula (1) exceeds 1, it is regarded as 1. Calculationally, the right side of formula (1) may exceed 1, but H t cannot take a value exceeding 1 from its definition. Therefore, when the right side of formula (1) exceeds 1, it can be regarded as 1 without any problem. It doesn't matter. There is no problem. In the above formulas (1) to (3), t represents the temperature (°C), and H t is the melting component amount of the resin composition at the temperature t. Here, H t is measured by the method of measuring the endothermic peak of DSC to measure the endothermic curve of the resin composition , and the total endothermic heat amount ΔH m and the total endothermic heat amount h from the melting start temperature t0 °C to t °C are obtained and calculated by the following formula (4). t H t = h t / ΔH m Formula (4)

[0014] As formula (1), preferably, the following formula (1') is satisfied, more preferably, the following formula (1'') is satisfied, and still more preferably, the following formula (1''') is satisfied. H t ≦ 0.0104 × e 0.0370×t Formula (1') H t ≦ 0.0094 × e 0.0379×t Formula (1'') H t ≦ 0.0091 × e 0.0381×t Formula (1''') However, in any of formula (1'), formula (1'') and formula (1'''), when the calculated value on the right side exceeds 1, it is regarded as 1.

[0015] Also, as formula (2), preferably, the following formula (2') is satisfied, more preferably, the following formula ( 2'') is satisfied, and still more preferably, the following formula (2''') is satisfied. H t ≧ 0.0023 × e 0.0457×t Formula (2') H t ≧ 0.0020 × e 0.0470×t Formula (2'') H t ≧ 0.0012 × e 0.0515×t Formula (2''')

[0016] ​When the ethylene-based resin composition according to the present invention satisfies the above formula (1), the molded article such as a container obtained from the resin composition is less likely to be deformed, wrinkled, blocked, etc. even when sterilized under high temperature conditions of 116 °C or higher, and the sterilization property is improved. Further, when the ethylene-based resin composition according to the present invention satisfies the above formula (2), the molded article such as a container obtained from the resin composition has a transmittance of 55% or more at a wavelength of 450 nm by the ultraviolet-visible absorbance measurement method described in the transparency test method 1 of the Japanese Pharmacopoeia, 16th Revision, and the transparency is improved. Note that the formula (1) and its sub-formulas, and the formula (2) and its sub-formulas define the region through which the t-H t curve passes in the examples described later, and the upper limit curve and the lower limit curve are quantified by the least squares method are as follows. Furthermore, it is preferable that the ethylene-based resin composition according to the present invention satisfies the following requirements (a) to (c).

[0017]

[0018] (a) The density measured in accordance with JIS K7112 is 900 kg / m 3 or more and 980 kg / m 3 or less. The lower limit of the density is preferably 905 kg / m 3 , more preferably 910 kg / m 3 , and even more preferably 915 kg / m 3 . The upper limit of the density is preferably 975 kg / m 3 , more preferably 970 kg / m 3 , and even more preferably 965 kg / m 3 . When the density of the ethylene-based resin composition is 900 kg / m 3 or more, it is preferable in terms of heat resistance , and when it is 980 kg / m 3 or less, it is preferable in terms of transparency.​​​

[0019] (b) Measured according to JIS K7210 at 190 °C under a load of 2.16 kg, the melt flow rate (MFR) is 0.01 g / 10 min or more and 50 g / 10 min or less. The lower limit of the MFR is preferably 0.05 g / 10 min, more preferably 0.1 g / 10 min, even more preferably 0.5 g / 10 min. The upper limit of the MFR is preferably 20 g / 10 min , more preferably 15 g / 10 min, and even more preferably 10 g / 10 min. When the MFR of the ethylene resin composition is 0.01 g / 10 min or more, it is preferable in terms of appearance and when it is 50 g / 10 min or less, it is preferable in terms of molding stability.

[0020] (c) The maximum peak temperature (Tm) of the endothermic curve in a differential scanning calorimeter (DSC) is 116 °C or higher. The maximum peak temperature (Tm) is preferably 117 °C or higher, more preferably 118 °C or higher, even more preferably 119 °C or higher. Also, the upper limit of the maximum peak temperature (Tm) is determined by the melting point of the ethylene polymer used and no special regulation is made, but it is usually 13 5 °C or lower. When the maximum peak temperature (Tm) of the ethylene resin composition is 116 °C or higher, it is preferable in terms of heat resistance .

[0021] Examples of the ethylene polymer constituting the ethylene resin composition in the present invention include high-pressure process low-density polyethylene (HP-LDPE), linear low-density polyethylene (LLDPE), high-density polyethylene (HDPE), ethylene·α-olefin copolymer, ethylene·acid co polymer, etc.

[0022] As high-pressure low-density polyethylene (HP-LDPE), those having a density of 910 to 940 kg / m 3 , a melt flow rate (MFR) measured at 190 °C under a load of 2.16 kg of 0.05 to 50 g / 10 min are preferably used.

[0023] As linear low-density polyethylene (LLDPE), an ethylene content of 80 to 99 wt%, containing 1 to 20 wt% of an α-olefin having 3 to 10 carbon atoms as a comonomer, a density of 89 5 to 948 kg / m 3 , a melt flow rate (M FR) measured at 190 °C under a load of 2.16 kg of 0.01 to 50 g / 10 min are preferably used. As high-density polyethylene (HDPE), a density of 948 to 980 kg / m 3 , 190 °C , a melt flow rate (MFR) measured at 190 °C under a load of 2.16 kg of 0.01 to 50 g / 10 min are preferably used. As an ethylene-α-olefin copolymer, an ethylene content of 60 to 85 wt%, comonom er containing 15 to 40 wt% of an α-olefin having 3 to 10 carbon atoms, a density of 860 to 895 kg / m 3 , a melt flow rate (MFR ) measured at 190 °C under a load of 2.16 kg of 0.01 to 50 g / 10 min are preferably used. As an ethylene-acid copolymer, an ethylene content of 65 to 99 wt%, ethylene and copolymer izing acid copolymer (specifically, vinyl acetate, acrylic acid, methacrylic acid, etc.) content of 1 ~35 wt%, and a melt flow rate (MF R) measured at 190 °C under a load of 2.16 kg of 0.01 to 50 g / 10 min are preferably used.

[0024] As long as the ethylene-based resin composition in the present invention simultaneously satisfies the above formulas (1) to (3), in the case of using a single ethylene-based polymer, a mixture of two or more ethylene -based polymers, or even a mixture of an ethylene-based polymer and an olefin-based resin composition or a styrene-based resin composition other than ethylene may be used. Further, when adopting the mixture aspect, there is no particular limitation on the blending ratio of each polymer. As described above, as long as the above formulas (1) to (3) are simultaneously satisfied, any blending ratio is acceptable without any problem. (1) to (3) are simultaneously satisfied, any blending ratio is acceptable without any problem.

[0025] Preferred embodiments when mixing and using two or more ethylene-based polymers include the following ones. (I) 1 to 99 parts by mass of linear low-density polyethylene (LLDPE) having a density of 895 kg / m 3 or more and less than 920 kg / m 3 and 1 to 99 parts by mass of linear low-density polyethylene (LLDPE) having a density of 920 kg / m or more and less than 948 kg / m 3 (a total of 100 parts by mass for the two), 3 a combination of (II) 1 to 90 parts by mass of linear low-density polyethylene (LLDPE) having a density of 895 kg / m or more and less than 920 kg / m 3 and 1 to 90 parts by mass of linear low-density polyethylene (LLDPE) having a density of 920 kg / m 3 or more and less than 948 kg / m and 1 to 50 parts by mass of high-density polyethylene 3 (HDPE) (a total of 100 parts by mass for the three), 3 a combination of (III) 1 to 90 parts by mass of linear low-density polyethylene having a density of 895 kg / m or more and less than 920 kg / m 3 and 1 to 90 parts by mass of linear low-density polyethylene having a density of 920 kg / m 3 or more and less than 948 kg / m 1 to 90 parts by mass of linear low-density polyethylene (LLDPE) and a density of 920 kg / m 3 or more and 948 kg / m 3 or less of linear low-density polyethylene (LLDPE) 1 to 90 parts by mass and high-density polyethylene (HDPE) 1 to 50 parts by mass, and high-pressure low-density polyethylene (HP-LDPE) 1 to 5 0 parts by mass (a total of 100 parts by mass for the four combined). Combination with

[0026] When the ethylene-based resin composition in the present invention is used by mixing two or more ethylene-based polymers, the mixing method is not particularly limited, and general known methods can be used without limitation. For example, a method of directly adding during the pellet granulation process after polymerization or a method of dry blending during molding may be used. For example, a method of directly adding during the pellet granulation process after polymerization or a method of dry blending during molding may also be acceptable.

[0027] In addition, examples of the production methods of the above-exemplified ethylene-based polymers include the high-pressure method, the slurry method, the solution method, the gas-phase method, etc. When producing a polymer by the slurry method, the solution method, the gas-phase method, etc., examples of the olefin polymerization catalyst used include a magnesium chloride-supported titanium catalyst, the Phillips catalyst, the metallocene catalyst, etc. However, as long as the ethylene-based resin composition simultaneously satisfies the above formulas (1) to (3), there is no limitation on the production method of the ethylene-based polymer used. (1) to (3), there is no limitation on the production method of the ethylene-based polymer used. None.

[0028] The ethylene-based resin composition in the present invention, within a range that does not inhibit the effects of the present invention, may optionally contain antioxidants, weather stabilizers, antistatic agents, lubricants, antiblocking agents, etc., additives usually used in polyolefins. The method of mixing the above additives into the ethylene-based resin composition is not particularly limited. For example, during the pellet granulation process after polymerization additives usually used in polyolefins such as antioxidants, weather stabilizers, antistatic agents, lubricants, antiblocking agents, etc. may be added as necessary. The method of mixing the above additives into the ethylene-based resin composition is not particularly limited. For example, during the pellet granulation process after polymerization It may be added directly in the pellet process, or a high-concentration masterbatch may be prepared in advance and dry blended during molding. It may also be dry blended.

[0029] The ethylene resin composition according to the present invention described above simultaneously satisfies the above formulas (1) to (3). By doing so, since the heat resistance and transparency are very good, it can be suitably used as a material for various containers. It can be used. Containers that satisfy the above requirements are particularly preferable for medical or food applications. In the medical application field, it is particularly preferable to be an infusion container.

[0030] The shape of the container is arbitrarily selected according to the use of the container, and there is no particular limitation. Generally, a bottle shape, a bag shape, etc. can be mentioned. Also, the molding method of the container is not particularly restricted as long as the shape can be obtained. Preferably, blow molding, water cool inflation molding, air-cooled inflation molding, T-die casting molding, etc. can be mentioned. It can be mentioned.

[0031] After the container is sterilized by steam at 116°C for 26 minutes, the transmittance at a wavelength of 450 nm by the ultraviolet visible absorbance measurement method described in the first method of the transparency test in the "7.02 Plastic Pharmaceutical Container Test Method" of the sixteenth revision of the Japanese Pharmacopoeia is preferably 55% or more. It is more preferably 56% or more, and even more preferably 57% or more. After the steam sterilization treatment at 118°C for 16 minutes or 121°C for 15 minutes, if the transmittance satisfies 55% or more, it is regarded as satisfying 55% or more of the transmittance even in the sterilization treatment at 116°C for 26 minutes. Moreover, it is preferable that the haze after the above sterilization treatment is 50% or less, and more preferably 45% or less. Note that if the transmittance after the steam sterilization treatment at 118°C for 16 minutes or 121°C for 15 minutes satisfies 55% or more, it is regarded as satisfying 55% or more of the transmittance even in the sterilization treatment at 116°C for 26 minutes. It is regarded as such. Also, it is preferable that the haze after the above sterilization treatment is 50% or less, and more preferably 45% or less. Preferably, 40% or less is more preferable.

[0032] When the ethylene-based resin composition used for manufacturing the container satisfies the above formulas (1) to (3) it will naturally be satisfied, but when a higher transmittance is required, it is possible to use various polymers having different physical properties for the various polymers constituting the ethylene-based resin composition and adopt methods such as changing the composition ratio. When the transmittance satisfies the above range, it is shown that the obtained container has high heat resistance and transparency is achieved.

[0033] Further, when the container is a bottle, the thickness of the body portion of the container is preferably 0.01 ~1.00 mm, more preferably 0.10~0.70 mm, still more preferably 0.15~ 0.60 mm. Also, when the container is a bottle, the thickness of the neck portion is preferably 0.01~1.00 mm, more preferably 0.40~1.00 mm, still more preferably is in the range of 0.50~0.80 mm. Also, when the container is a bottle, the thickness of the shoulder portion is preferably 0.01~1.00 mm, more preferably 0.10~0.70 m m, still more preferably in the range of 0.20~0.50 mm. Also, when the container is a bag, the thickness of the body portion of the container is preferably 0.01~ 1.00 mm, more preferably 0.10~0.50 mm, still more preferably 0.15~0 .30 mm.

[0034] FIG. 1 is a schematic view of an infusion bottle 10 and an infusion bag 20 as infusion containers as one embodiment of the container according to the present invention. (a1) is a front view of the infusion bottle 10, (a2) is a view of the bottle body Cross-sectional view taken along line A-A of the portion, (b1) is a front view of the infusion bag 20, and (b2) is B-B of the bag body is a cross-sectional view. The infusion bottle 10 includes a body portion 11, a shoulder portion 12, a neck portion 13, a cap 14, and a clamp portion 15 provided with a hole for hanging on an infusion stand. The clamp portion 15 is configured to be foldable when the cap portion is placed upward. The infusion bag 20 is provided with a seal portion 22 surrounding the liquid storage portion 21 which is the body portion, and a cylindrical member 23 for allowing a chemical solution or the like to flow in and out between the liquid storage portion 21 and the outside of the infusion bag 20 is engaged with an opening for infusion in a part. A hole 24 for hanging on an infusion stand is provided on the opposite side of the cylindrical member 23 of the seal portion 22. Note that the thickness of the body portion described above means the average thickness, and the measurement is taken from a portion of the body of the container with as little curvature as possible and as uniform as possible, for example, the region 16 shown in FIG. 1(a1). The thicknesses of any 10 points are measured and the average value is taken. Also, the thickness of the neck portion is the thickness of the central portion C from the base of the neck of the container to the shoulder R portion, and the thickness of the shoulder portion is the thickness of the shoulder R portion D of the container. The thickness of the body portion of the infusion bag 20 is, for example, the thicknesses of any 10 points are measured for the region 25 shown in FIG. 1(b1), and the average value is taken. In the infusion bottle 10, the portion excluding the cap, and in the infusion bag 20, the portion excluding the cylindrical member 23 are preferably configured to include the ethylene-based resin composition according to the present invention. Also, in the case of the bottle, a configuration may be adopted in which a clamp portion is not provided in the portion configured to include the ethylene-based resin composition, and a separately created clamp portion is attached. Furthermore, the container may have a single-layer or a multi-layer configuration of two or more layers as a layer structure, but it is a single layer in this case. It is also possible. Preferably, the portion of the infusion bottle 10 excluding the cap and the portion of the infusion bag 20 excluding the cylindrical member 23 are composed of the ethylene-based resin composition according to the present invention. In the case of the bottle, a configuration may be adopted in which a clamp portion is not provided in the portion composed of the ethylene-based resin composition, and a separately created clamp portion is attached. In addition, the thickness of the body portion of the infusion bag 20 is measured by measuring the thicknesses of any 10 points in the region 25 shown in FIG. 1(b1) and taking the average value. In the infusion bottle 10, the portion excluding the cap, and in the infusion bag 20, the portion excluding the cylindrical member 23 are preferably configured to include the ethylene-based resin composition according to the present invention. Also, in the case of the bottle, a configuration may be adopted in which a clamp portion is not provided in the portion configured to include the ethylene-based resin composition, and a separately created clamp portion is attached. In the case of the bottle, a configuration may be adopted in which a clamp portion is not provided in the portion composed of the ethylene-based resin composition, and a separately created clamp portion is attached. Moreover, the container may have a layer structure, which may be a single layer or a multi-layer structure of two or more layers, but it is preferably a single layer.

[0035] Furthermore, the container may be in a layer structure, which may be a single layer or a multi-layer structure of two or more layers. This is preferable from the viewpoint of simplifying the molding of the container. Further, the container made of the ethylene-based resin composition according to the present invention, even if it is formed as a single layer, has no deformation, blocking, or wrinkle generation in the container after sterilization treatment at 116 °C or higher, so it is superior to the container made of the ethylene-based resin composition manufactured by the existing technology. As a high-temperature sterilization method for the container according to the present invention, for example, in the case of a chemical solution such as an infusion solution, usually, in a state where it is housed and sealed in a container (chemical solution bottle or chemical solution bag), known heat sterilization treatments such as high-pressure steam sterilization and hot water shower sterilization can be applied. The sterilization treatment temperature in these heat sterilization treatments is generally about 105 to 110 °C, but in the present invention, a heat sterilization treatment at 116 °C or higher can be applied. Further, according to the type, usage method, use environment, etc. of the chemical solution, the sterilization treatment temperature can also be set to 118 to 121 °C.

Examples

[0036] (Density) According to Method D of JIS K7112:99, the sample was immersed in hot water at 100 °C for 60 minutes, and then the sample cooled to room temperature was measured. (MFR (Melt Flow Rate)) Measured according to JIS K7210:99 at 190 °C under a load of 2.16 kg. (Melting Point (Tm))

Examples

[0037] Hereinafter, the present invention will be described with reference to examples, but the present invention is not limited to these examples. The physical property values of the ethylene-based resin compositions used in the examples and comparative examples were measured by the following analysis methods. Measured according to the following analysis methods.

[0038] (Density) According to Method D of JIS K7112:99, the sample was immersed in hot water at 100 °C for 60 minutes, and then the sample cooled to room temperature was measured.

[0039]

[0040] (MFR (Melt Flow Rate)) Measured according to JIS K7210:99 at 190 °C under a load of 2.16 kg.

[0040] (Melting Point (Tm)) Performed using a DSC-7 type apparatus manufactured by PerkinElmer. The melting point (Tm) is the temperature at the maximum peak position in the endothermic curve. Approximately 5 mg of the sample was packed in an aluminum pan, heated to 230 °C at a rate of 10 °C / min, held at 230 °C for 10 minutes, then cooled to 30 °C at a rate of 10 °C / min, and then determined from the endothermic curve when heating at a rate of 10 °C / min.

[0041] (Melting component amount (H t )) The melting component amount H t was measured by measuring the endothermic curve of the sample according to the measurement method of the endothermic peak of DSC, and the total heat of fusion ΔH of the sample and the total heat amount h m of the heat of fusion from the melting start temperature t0 °C to t °C were determined, and t calculated from Equation (4). H t = h t / ΔH m ····· Equation (4)

[0042] Also, the bottles and bags produced in the examples and comparative examples were produced by the following method. Also, evaluations were performed on the following items respectively.

[0043] (Manufacture of bottles) The ethylene-based resin compositions prepared in the examples and comparative examples were used with a blow molding machine manufactured by Romerag, at a cylinder temperature of 160 - 180 °C, a die temperature of 160 - 180 °C, a mold temperature of 15 - 2 0 °C, and a blow pressure of 3 kg / cm 2 -G to mold a hollow molded product (bottle) so that the thickness of the body part is near 0.4 mm, the thickness of the neck part is near 0.65 mm, and the thickness of the shoulder part is near 0.4 mm. Also, the bottle was molded so that the body part had an elliptical shape of L68 × W40 × H75, and the neck part had a new circular shape of Φ20 × H14.

[0044] (Manufacture of Bags) The ethylene resin compositions prepared in the examples and comparative examples were processed using a water-cooled inflation molding machine manufactured by Placo Co., Ltd. to produce a film at a cylinder temperature of 190 - 200 °C, a die temperature of 200 °C, an extrusion rate of 62 kg / h, and a sizing diameter of 320 mmφ. The film was then sealed on all four sides at 168 °C for 1.85 seconds using upper and lower molds to manufacture bags with an inner dimension of 125 × 200 mm and a sealing width of 6 mm horizontally.

[0045] (Sterilization Treatment) After filling the bottles obtained by the above method with 100 mL of distilled water, they were capped and sterilized using a hot water spray sterilizer manufactured by Nisaka Seisakusho under any of the conditions shown in Table 1, and then cooled to room temperature. Also, after filling the bags obtained by the above method with 500 mL of distilled water, they were capped and sterilized using a hot water spray sterilizer manufactured by Nisaka Seisakusho under any of the conditions shown in Table 1, and then cooled to room temperature.

[0046]

Table 1

[0047] (Transmittance at a Wavelength of 450 nm) The transmittance at a wavelength of 450 nm of the bottles and bags after the above sterilization treatment was measured by the ultraviolet-visible absorbance measurement method described in the First Method of the Transparency Test of the Japanese Pharmacopoeia, Sixteenth Revision. Specifically, test pieces of a certain shape were cut from the bottles and bags after the above sterilization treatment, and after 48 hours or more had elapsed since sterilization, the transmittance at a wavelength of 450 nm was measured using a UV-1800 manufactured by Shimadzu Corporation.

[0048] (Average Thickness) The average thickness of the body part was measured from the body parts of the bottles and bags after the above sterilization treatment, taking the least curved parts possible. For the less uniform parts (the hatched part 16 in Fig. 1(a1) for the bottle and the hatched part 25 in Fig. 1(b1) for the bag), any 10 points were cut out as test pieces, and the thickness of each test piece was measured using a Mitutoyo Corporation's Digital Micrometer_MDC-25M (product name). The average value of the 10 measurement results was taken. For the average thickness of the neck part, the center part C from the root of the neck to the shoulder R of the bottle after the above sterilization treatment was measured using an Olympus Corporation's Magna-Mike8500 (product name). For the average thickness of the shoulder part, the shoulder R part D of the bottle after the above sterilization treatment was measured using an Olympus Corporation's Magna-Mike8500. The average value of the 10 measurement results was taken. The average thickness of the neck part was measured from the root of the neck to the shoulder R of the bottle after the above sterilization treatment at the central part C using an Olympus Corporation's Magna-Mike8500 (product name). The average thickness of the shoulder part was measured at the shoulder R part D of the bottle after the above sterilization treatment using an Olympus Corporation's Magna-Mike8500. The average thickness of the shoulder part was measured at the shoulder R part D of the bottle after the above sterilization treatment using an Olympus Corporation's Magna-Mike8500. The average thickness of the shoulder part was measured at the shoulder R part D of the bottle after the above sterilization treatment using an Olympus Corporation's Magna-Mike8500.

[0049] (HAZE) For the HAZE of the bottle and the bag after the above sterilization treatment, the same test pieces as those for which the transmittance at a wavelength of 450 nm was measured were measured using a Nippon Denshoku Industries Co., Ltd.'s HAZE METER NDH5000 (product name). For the HAZE of the bottle and the bag after the above sterilization treatment, the same test pieces as those for which the transmittance at a wavelength of 450 nm was measured were measured using a Nippon Denshoku Industries Co., Ltd.'s HAZE METER NDH5000 (product name). The average value of the 10 measurement results was taken.

[0050] (Appearance evaluation) The appearance of the bottle after the above sterilization treatment was evaluated according to the items in Table 2 below.

[0051]

Table 2

[0052] Also, for the appearance of the bag after the above sterilization treatment, an evaluation of the presence or absence of deformation was performed. Specifically, the bag was observed after sterilization to check whether there were folds or large wrinkles at the seal part 22 and whether the bag was swollen and deformed. Specifically, the bag was observed after sterilization to check whether there were folds or large wrinkles at the seal part 22 and whether the bag was swollen and deformed. Specifically, the bag was observed after sterilization to check whether there were folds or large wrinkles at the seal part 22 and whether the bag was swollen and deformed.

[0053] The ethylene-based resin compositions used in the examples and comparative examples are the following various ethylene-based polymers. Prepared using

[0054] ○ Linear low density polyethylene (LLDPE) (LL-1) MFR: 1.0 g / 10 min, density: 904 kg / m 3 , melting point 90 °C, M w / Mn = 3.0 (LL-2) MFR: 3.7 g / 10 min, density: 918 kg / m 3 , melting point 114 °C, Mw / Mn = 2.2 (LL-3) MFR: 1.4 g / 10 min, density: 921 kg / m 3 , melting point 121 °C, Mw / Mn = 2.9 (LL-4) MFR: 2.1 g / 10 min, density: 921 kg / m 3 , melting point 115 °C, Mw / Mn = 2.9 (LL-5) MFR: 2.2 g / 10 min, density: 937 kg / m 3 , melting point 125 °C, Mw / Mn = 2.7 ○ High density polyethylene (HDPE) (HD-1) MFR: 17 g / 10 min, density: 959 kg / m 3 , melting point 131 °C, M w / Mn = 2.8 (HD-2) MFR: 2.1 g / 10 min, density: 940 kg / m 3 , melting point 126 °C, Mw / Mn = 2.7 (HD-3) MFR: 0.43 g / 10 min, density: 944 kg / m 3 , melting point 129 °C , Mw / Mn = 6.0 ○ High pressure low density polyethylene (HP-LDPE) (LD-1) MFR: 0.9 g / 10 min, density: 929 kg / m 3 , melting point 114 °C, Mw / Mn = 5.1 (LD-2) MFR: 0.32 g / 10 min, density: 925 kg / m 3 , melting point 116 °C , Mw / Mn = 5.0 (LD-3) MFR: 0.4 g / 10 min, density: 927 kg / m 3 , melting point 114 °C Mw / Mn = 5.0

[0055] [Example 1] Ethylene resin composition 1 obtained by blending 50 parts by mass of LL-1 and 50 parts by mass of LL-5 was used to manufacture a bottle container, sterilize it under condition 4, and evaluate the sterilized container. The results are shown in Table 3. Also, the melting component amount Ht of the ethylene resin composition 1 is shown in Table 4 and Figure 2.

[0056] [Example 2] Ethylene resin composition 2 obtained by blending 40 parts by mass of LL-1 and 60 parts by mass of LL-5 was used to manufacture a bottle container, sterilize it under condition 4, and evaluate the sterilized container. The results are shown in Table 3. Also, the melting component amount Ht of the ethylene resin composition 2 is shown in Table 4 and Figure 2.

[0057] [Example 3] Ethylene resin composition 3 obtained by blending 30 parts by mass of LL-1 and 70 parts by mass of LL-5 was used to manufacture a bottle container, sterilize it under condition 4, and evaluate the sterilized container. The results are shown in Table 3. Also, the melting component amount Ht of the ethylene resin composition 3 is shown in Table 4 and Figure 2.

[0058] [Example 4] Ethylene resin composition 4 obtained by blending 47.5 parts by mass of LL-1, 47.5 parts by mass of LL-5, and 5 parts by mass of HD-1 was used to manufacture a bottle container, sterilize it under condition 4, and evaluate the sterilized container. The results are shown in Table 3. Also, for the ethylene resin system composition 4, the evaluation of the sterilized container was carried out. The results are shown in Table 3. Also, the ethylene-based The melting component amount Ht of the resin composition 4 is shown in Table 4 and FIG. 2.

[0059] [Example 5] Ethylene resin composition 5 obtained by blending LL-1 at 38 parts by mass, LL-5 at 57 parts by mass, and HD-1 at 5 parts by mass was used to manufacture a bottle container and sterilize it under Condition 4, and the evaluation of the container after sterilization was carried out. The results are shown in Table 3. Also, the melting component amount Ht of the ethylene resin composition 5 is shown in Table 4 and FIG. 2.

[0060] [Example 6] Ethylene resin composition 6 obtained by blending LL-1 at 45 parts by mass, LL-5 at 45 parts by mass, HD-1 at 5 parts by mass, and LD-1 at 5 parts by mass was used to manufacture a bottle container and sterilize it under Condition 4, and the evaluation of the container after sterilization was carried out. The results are shown in Table 3. Also, the melting component amount Ht of the ethylene resin composition 6 is shown in Table 5 and FIG. 3.

[0061] [Example 7] Ethylene resin composition 7 obtained by blending LL-1 at 35 parts by mass, LL-5 at 35 parts by mass, HD-1 at 5 parts by mass, and LD-1 at 25 parts by mass was used to manufacture a bottle container and sterilize it under Condition 4, and the evaluation of the container after sterilization was carried out. The results are shown in Table 3. Also, the melting component amount Ht of the ethylene resin composition 7 is shown in Table 5 and FIG. 3.

[0062] [Example 8] Ethylene resin composition 8 obtained by blending LL-1 at 60 parts by mass, LL-5 at 30 parts by mass, HD-1 at 5 parts by mass, and LD-1 at 5 parts by mass was used to manufacture a bottle container and sterilize it under Condition 4, and the evaluation of the container after sterilization was carried out. The results are shown in Table 3. Also, The melt content Ht of the ethylene resin composition 8 is shown in Table 5 and FIG.

[0063] [Example 9] 50 parts by weight of LL-1, 40 parts by weight of LL-5, 5 parts by weight of HD-1, 5 parts by weight of LD-1 The ethylene-based resin composition 9 obtained by blending the above components in a blending ratio of 100 parts was used to manufacture a bottle container. The containers were manufactured and sterilized under Condition 4, and the containers after sterilization were evaluated. The results are shown in Table 3. The melt content Ht of the ethylene resin composition 9 is shown in Table 5 and FIG.

[0064] [Example 10] 40 parts by weight of LL-1, 50 parts by weight of LL-5, 5 parts by weight of HD-1, 5 parts by weight of LD-1 The ethylene-based resin composition 10 obtained by blending the above components in a blending ratio of 10 parts was used to manufacture a bottle container. The containers were manufactured and sterilized under condition 4, and the containers after sterilization were evaluated. The results are shown in Table 3. The melt content Ht of the ethylene resin composition 10 is shown in Table 5 and FIG.

[0065] [Table 3]

[0066] [Table 4]

[0067] [Table 5]

[0068] [Example 11] 35 parts by weight of LL-1, 50 parts by weight of LL-5, 5 parts by weight of HD-1, 10 parts by weight of LD-1 The ethylene-based resin composition 11 obtained by blending the above in a blending ratio of parts by mass was used to manufacture a bottle. The containers were manufactured, sterilized under Conditions 4 and 5, and the evaluation of each sterilized container was carried out. The results are shown in Table 6. The melting component amount Ht of the ethylene resin composition 11 is shown in Table 7 and FIG. 4.

[0069] [Example 12] Using the ethylene resin composition 12 obtained by blending LL-1 at 25 parts by mass, LL-5 at 50 parts by mass, HD-1 at 5 parts by mass, and LD-1 at 20 parts by mass, bottles were manufactured, sterilized under Conditions 4 and 5, and the evaluation of each sterilized container was carried out. The results are shown in Table 6. The melting component amount Ht of the ethylene resin composition 12 is shown in Table 7 and FIG. 4.

[0070] [Example 13] Using the ethylene resin composition 13 obtained by blending LL-1 at 28 parts by mass, LL-5 at 57 parts by mass, HD-1 at 5 parts by mass, and LD-1 at 10 parts by mass, bottles were manufactured, sterilized under Conditions 4 and 5, and the evaluation of each sterilized container was carried out. The results are shown in Table 6. The melting component amount Ht of the ethylene resin composition 13 is shown in Table 7 and FIG. 4.

[0071] [Example 14] Using the ethylene resin composition 14 obtained by blending LL-1 at 18 parts by mass, LL-5 at 37 parts by mass, HD-1 at 5 parts by mass, and LD-1 at 40 parts by mass, bottles were manufactured, sterilized under Conditions 4 and 5, and the evaluation of each sterilized container was carried out. The results are shown in Table 6. The melting component amount Ht of the ethylene resin composition 14 is shown in Table 7 and FIG. 4.

[0072] [Example 15] Using the ethylene resin composition 15 obtained by blending LL-1 at 12 parts by mass, LL-5 at 23 parts by mass, HD-1 at 5 parts by mass, and LD-1 at 60 Using the ethylene-based resin composition 15 obtained by blending at the compounding ratio of the mass parts, a bottle container was manufactured, sterilized under Conditions 4 and 5, and the evaluation of each sterilized container was carried out. The results are shown in Table 6 . Also, the melting component amount Ht of the ethylene-based resin composition 15 is shown in Table 7 and FIG. 4.

[0073] [Example 16] Using the ethylene-based resin composition 16 obtained by blending LL-1 at 40 mass parts, LL-5 at 50 mass parts, HD-1 at 5 mass parts, and LD-3 at 5 mass parts, a bottle container was manufactured, sterilized under Conditions 4 and 5, and the evaluation of each sterilized container was carried out. The results are shown in Table 6 . Also, the melting component amount Ht of the ethylene-based resin composition 16 is shown in Table 8 and FIG. 5.

[0074] [Example 17] Using the ethylene-based resin composition 17 obtained by blending LL-1 at 35 mass parts, LL-5 at 50 mass parts, HD-1 at 5 mass parts, and LD-3 at 10 mass parts, a bottle container was manufactured, sterilized under Conditions 4 and 5, and the evaluation of each sterilized container was carried out. The results are shown in Table 6 . Also, the melting component amount Ht of the ethylene-based resin composition 17 is shown in Table 8 and FIG. 5.

[0075] [Example 18] Using the ethylene-based resin composition 18 obtained by blending LL-1 at 25 mass parts, LL-5 at 50 mass parts, HD-1 at 5 mass parts, and LD-3 at 20 mass parts, a bottle container was manufactured, sterilized under Conditions 4 and 5, and the evaluation of each sterilized container was carried out. The results are shown in Table 6 . Also, the melting component amount Ht of the ethylene-based resin composition 18 is shown in Table 8 and FIG. 5.

[0076] [Example 19] 5 parts by mass of LL-1, 50 parts by mass of LL-5, 5 parts by mass of HD-1, and 40 parts by mass of LD-3 Using ethylene resin composition 19 obtained by blending at a compounding ratio of, bottle containers were manufactured, sterilized under Conditions 4 and 5, and the containers after each sterilization were evaluated. The results are shown in Table 6. Also, the melting component amount Ht of the ethylene resin composition 19 is shown in Table 8 and FIG. 5.

[0077] [Example 20] 28 parts by mass of LL-1, 57 parts by mass of LL-5, 5 parts by mass of HD-1, and 10 parts by mass of LD-3, using ethylene resin composition 20 obtained by blending at a compounding ratio of, bottle containers were manufactured, sterilized under Conditions 4 and 5, and the containers after each sterilization were evaluated. The results are shown in Table 6. Also, the melting component amount Ht of the ethylene resin composition 20 is shown in Table 9 and FIG. 6.

[0078] [Example 21] 18 parts by mass of LL-1, 37 parts by mass of LL-5, 5 parts by mass of HD-1, and 40 parts by mass of LD-3, using ethylene resin composition 21 obtained by blending at a compounding ratio of, bottle containers were manufactured, sterilized under Conditions 4 and 5, and the containers after each sterilization were evaluated. The results are shown in Table 6. Also, the melting component amount Ht of the ethylene resin composition 21 is shown in Table 9 and FIG. 6.

[0079] [Example 22] 12 parts by mass of LL-1, 23 parts by mass of LL-5, 5 parts by mass of HD-1, and 60 parts by mass of LD-3, using ethylene resin composition 22 obtained by blending at a compounding ratio of, bottle containers were manufactured, sterilized under Conditions 4 and 5, and the containers after each sterilization were evaluated. The results are shown in Table 6. Also, the melting component amount Ht of the ethylene resin composition 22 is shown in Table 9 and FIG. 6.

[0080]

Table 6

[0081]

Table 7

[0082]

Table 8

[0083]

Table 9

[0084] [Comparative Example 1] Ethylene resin composition C1 obtained by blending 60 parts by mass of LL-1 and 40 parts by mass of LL-5 was used to manufacture a bottle container, sterilized under Condition 4, and the sterilized container was evaluated. The results are shown in Table 10. Also, the melting component amount Ht of the ethylene resin composition C1 is shown in Table 12 and FIG. 7.

[0085] [Comparative Example 2] Ethylene resin composition C2 obtained by blending 40 parts by mass of LL-1, 40 parts by mass of LL-5, and 20 parts by mass of HD-1 was used to manufacture a bottle container, sterilized under Condition 4, and the sterilized container was evaluated. The results are shown in Table 10. Also, the melting component amount Ht of the ethylene resin composition C2 is shown in Table 12 and FIG. 7.

[0086] [Comparative Example 3] Ethylene resin composition C3 obtained by blending 32 parts by mass of LL-1, 48 parts by mass of LL-5, and 20 parts by mass of HD-1 was used to manufacture a bottle container, sterilized under Condition ​​​​It was sterilized at 4, and the evaluation of the container after sterilization was carried out. The results are shown in Table 10. Also, the melting component amount Ht of the ethylene-based resin composition C3 is shown in Table 12 and FIG. 7. The melting component amount Ht of the ethylene-based resin composition C3 is shown in Table 12 and FIG. 7.

[0087] [Comparative Example 4] Using the ethylene-based resin composition C4 obtained by blending LL-1 at 70 parts by mass, LL-5 at 20 parts by mass, HD-1 at 5 parts by mass, and LD-1 at 5 parts by mass, a bottle container was manufactured and sterilized under Condition 4, and the evaluation of the container after sterilization was carried out. The results are shown in Table 10. Using the ethylene-based resin composition C4 obtained by blending LL-1 at 70 parts by mass, LL-5 at 20 parts by mass, HD-1 at 5 parts by mass, and LD-1 at 5 parts by mass, a bottle container was manufactured and sterilized under Condition 4, and the evaluation of the container after sterilization was carried out. The results are shown in Table 10. Also, the melting component amount Ht of the ethylene-based resin composition C4 is shown in Table 12 and FIG. 7. Also, the melting component amount Ht of the ethylene-based resin composition C4 is shown in Table 12 and FIG. 7.

[0088] [Comparative Example 5] Using the ethylene-based resin composition C5 obtained by blending LL-1 at 30 parts by mass, LL-5 at 60 parts by mass, HD-1 at 5 parts by mass, and LD-1 at 5 parts by mass, a bottle container was manufactured and sterilized under Condition 4, and the evaluation of the container after sterilization was carried out. The results are shown in Table 10. Using the ethylene-based resin composition C5 obtained by blending LL-1 at 30 parts by mass, LL-5 at 60 parts by mass, HD-1 at 5 parts by mass, and LD-1 at 5 parts by mass, a bottle container was manufactured and sterilized under Condition 4, and the evaluation of the container after sterilization was carried out. The results are shown in Table 10. Also, the melting component amount Ht of the ethylene-based resin composition C5 is shown in Table 12 and FIG. 7. Also, the melting component amount Ht of the ethylene-based resin composition C5 is shown in Table 12 and FIG. 7.

[0089] [Comparative Example 6] Using the ethylene-based resin composition C6 obtained by blending LL-1 at 20 parts by mass, LL-5 at 70 parts by mass, HD-1 at 5 parts by mass, and LD-1 at 5 parts by mass, a bottle container was manufactured and sterilized under Condition 4, and the evaluation of the container after sterilization was carried out. The results are shown in Table 10. Using the ethylene-based resin composition C6 obtained by blending LL-1 at 20 parts by mass, LL-5 at 70 parts by mass, HD-1 at 5 parts by mass, and LD-1 at 5 parts by mass, a bottle container was manufactured and sterilized under Condition 4, and the evaluation of the container after sterilization was carried out. The results are shown in Table 10. Also, the melting component amount Ht of the ethylene-based resin composition C6 is shown in Table 12 and FIG. 7. Also, the melting component amount Ht of the ethylene-based resin composition C6 is shown in Table 12 and FIG. 7.

[0090] [Comparative Example 7] Using the ethylene-based resin composition C7 obtained by blending LL-2 at 95 parts by mass and HD-2 at 5 parts by mass, a bottle container was manufactured and sterilized under Condition 4, and the container after sterilization Using the ethylene-based resin composition C7 obtained by blending LL-2 at 95 parts by mass and HD-2 at 5 parts by mass, a bottle container was manufactured and sterilized under Condition 4, and the container after sterilization The results are shown in Table 10. The melt content of the ethylene resin composition C7 was also evaluated. Ht is shown in Table 13 and FIG.

[0091] [Comparative Example 8] Ethylene glycol obtained by blending 90 parts by mass of LL-2 and 10 parts by mass of HD-2 Bottle containers were manufactured using the polyethylene resin composition C8 and sterilized under condition 4. The results are shown in Table 10. The melting component of the ethylene resin composition C8 was also evaluated. The quantity Ht is shown in Table 13 and FIG.

[0092] [Comparative Example 9] An ethylene blend obtained by blending 95 parts by mass of LL-2 and 5 parts by mass of HD-1. The resin composition C9 was used to manufacture a bottle container and sterilize it under condition 4. The results are shown in Table 10. The melt content of the ethylene resin composition C9 was also evaluated. Ht is shown in Table 13 and FIG.

[0093] [Comparative Example 10] Ethylene glycol obtained by blending 70 parts by mass of LL-2 and 30 parts by mass of HD-1 Bottle containers were manufactured using the polyethylene resin composition C10 and sterilized under condition 4. The container was evaluated. The results are shown in Table 10. The melting of the ethylene resin composition C10 was also evaluated. The component amounts Ht are shown in Table 13 and FIG.

[0094] [Comparative Example 11] An ethylene blend obtained by blending 95 parts by mass of LL-3 and 5 parts by mass of HD-2. The resin composition C11 was used to manufacture a bottle container and sterilize it under condition 4. The results are shown in Table 11. The doses Ht are shown in Table 13 and FIG.

[0095] [Comparative Example 12] Ethylene resin composition C12 obtained by blending 90 parts by mass of LL-3 and 10 parts by mass of HD-2 was used to manufacture a bottle container, sterilized under Condition 4, and the container after sterilization was evaluated. The results are shown in Table 11. Also, the melting component amount Ht of the ethylene resin composition C12 is shown in Table 13 and FIG. 8.

[0096] [Comparative Example 13] Ethylene resin composition C13 obtained by blending 70 parts by mass of LL-5 and 30 parts by mass of LD-2 was used to manufacture a bottle container, sterilized under Condition 4, and the container after sterilization was evaluated. The results are shown in Table 11. Also, the melting component amount Ht of the ethylene resin composition C13 is shown in Table 14 and FIG. 9.

[0097] [Comparative Example 14] Ethylene resin composition C14 obtained by blending 70 parts by mass of HD-2 and 30 parts by mass of LD-2 was used to manufacture a bottle container, sterilized under Condition 4, and the container after sterilization was evaluated. The results are shown in Table 11. Also, the melting component amount Ht of the ethylene resin composition C14 is shown in Table 14 and FIG. 9.

[0098] [Comparative Example 15] Ethylene resin composition C15 obtained by blending 70 parts by mass of HD-3 and 30 parts by mass of LD-2 was used to manufacture a bottle container, sterilized under Condition 4, and the container after sterilization was evaluated. The results are shown in Table 11. Also, the melting component amount Ht of the ethylene resin composition C15 is shown in Table 14 and FIG. 9.

[0099] [Comparative Example 16] Ethylene resin composition C16 obtained by blending 95 parts by mass of LL-5 and 5 parts by mass of LD-2 was used to manufacture a bottle container, sterilize it under Condition 4, and evaluate the container after sterilization. The results are shown in Table 11. The melting component amount Ht of the ethylene resin composition C16 is shown in Table 14 and FIG. 9. and the evaluation of the container after sterilization was carried out. The results are shown in Table 11. Also, the melting component amount Ht of the ethylene resin composition C16 is shown in Table 14 and FIG. 9.

[0100] [Table 10]

[0101] [Table 11]

[0102] [Table 12]

[0103] [Table 13]

[0104] [Table 14]

[0105] [Example 23] In Example 1, using ethylene resin composition 1 blended at a mixing ratio of 50 parts by mass of LL-1 and 50 parts by mass of LL-5, a bag container with a thickness of 250 μm was manufactured, sterilized under Condition 5, and the container was evaluated. The results are shown in Table 15. and the evaluation of the container was carried out. The results are shown in Table 15.

[0106] [Example 24] Using the same ethylene resin composition 1 as in Example 23, a bag container with a thickness of 210 μm was manufactured and similarly sterilized and the container was evaluated. The results are shown in Table 15.

[0107] [Example 25] Using the same ethylene resin composition 1 as in Example 23, a bag container with a thickness of 290 μm was manufactured. And similarly, sterilization and evaluation of the container were carried out. The results are shown in Table 15.

[0108] [Example 26] In Example 6, ethylene resin composition 6 was blended at a mixing ratio of 45 parts by mass of LL-1, 45 parts by mass of LL-5, 5 parts by mass of HD-1, and 5 parts by mass of LD-1. Using this, a bag container with a thickness of 250 μm was manufactured, and sterilization and evaluation of the container were carried out under Condition 6. The results are shown in Table 15. And similarly, sterilization and evaluation of the container were carried out. The results are shown in Table 15. The results are shown in Table 15.

[0109] [Example 27] Using the same ethylene resin composition 6 as in Example 26, a bag container with a thickness of 210 μm was manufactured. And similarly, sterilization and evaluation of the container were carried out. The results are shown in Table 15.

[0110] [Example 28] Using the same ethylene resin composition 6 as in Example 26, a bag container with a thickness of 290 μm was manufactured. And similarly, sterilization and evaluation of the container were carried out. The results are shown in Table 15.

[0111] [Comparative Example 17] As ethylene resin composition C17, 100 parts by mass of LL-5 was used to manufacture a bag container with a thickness of 250 μm, and sterilization and evaluation of the container were carried out under Condition 6. The results are shown in Table 16. And the melting component amount Ht of ethylene resin composition C17 is shown in Table 17 and Figure 10. The results are shown in Table 16. Also, the melting component amount Ht of ethylene resin composition C17 is shown in Table 17 and Figure 10.

[0112] [Comparative Example 18] Using ethylene resin composition C17, a bag container with a thickness of 210 μm was manufactured, and sterilization and evaluation of the container were carried out under Condition 6. The results are shown in Table 16.

[0113] [Comparative Example 19] As the ethylene resin composition C18, 100 parts by mass of LL-4 was used to produce a bag container with a thickness of 250 μm and sterilization under Condition 5 and evaluation of the container were carried out. The results are shown in Table 16 In addition, the melting component amount Ht of the ethylene resin composition C18 is shown in Table 17 and FIG. 10

[0114] [Comparative Example 21] Using the ethylene resin composition C18, a bag container with a thickness of 210 μm was produced, and sterilization under Condition 5 and evaluation of the container were carried out. The results are shown in Table 16

[0115] [Table 15]

[0116] [Table 16]

[0117] [Table 17] [Explanation of Symbols]

[0118] 10 Infusion bottle 11 Body 12 Shoulder 13 Neck 14 Cap 15 Clamp part 16 Body thickness measurement location 20 Infusion bag 21 Liquid storage part (body) 22 Seal part 23 Cylindrical member 24 Hole 25 Body thickness measurement location

Claims

1. An ethylene-based resin composition simultaneously satisfying the following formulas (1) to (3): H ｔ ≦0.0133rae ０．０３５０ラｔ Formula (1) H ｔ ≧0.0025rae ０．０４５０ラｔ Formula (2) (However, if the calculated value of the right side of formula (1) exceeds 1, it is considered to be 1.) 110≦t≦130 Formula (3) (In formulas (1) to (3), t is the temperature (° C.); H ｔ The endothermic curve of the resin composition is measured by a method for measuring the endothermic peak of a differential scanning calorimeter (DSC), and the total heat of fusion H ｍ and the melting start temperature t ０ Total heat of fusion from ℃ to t℃ h ｔ is calculated using the following formula (4): H ｔ = h ｔ / ToH ｍ Formula (4) The melting component amount of the resin composition at temperature t is calculated by the following formula. Density 895kg / m ３ or more and 920 kg / m ３ 47.5 to 90 parts by mass of linear low density polyethylene (LLDPE) having a density of 920 kg / m ３ or more and 948 kg / m ３ An ethylene-based resin composition which is a combination of 1 to 90 parts by mass of linear low density polyethylene (LLDPE) and 1 to 50 parts by mass of high density polyethylene (HDPE) (total of 100 parts by mass of all three types).

2. The ethylene-based resin composition according to claim 1, which satisfies the following requirements (a) to (c): (a) Density measured in accordance with JIS K7112 is 900 kg / m ３ More than 980kg / m ３ below, (b) a melt flow rate (MFR) measured in accordance with JIS K7210 at 190° C. under a load of 2.16 kg is 0.01 g / 10 min or more and 50 g / 10 min or less; (c) The maximum peak temperature (Tm) of the endothermic curve in a differential scanning calorimeter (DSC) is 116° C. or higher.

3. A container comprising the ethylene-based resin composition according to claim 1 or 2.

4. 4. The container according to claim 3, which, after high-temperature sterilization at 116° C. for 26 minutes, satisfies a transmittance of 55% or more at a wavelength of 450 nm according to the ultraviolet-visible absorbance measurement method described in the Transparency Test Method 1 of the 16th Edition of the Japanese Pharmacopoeia.

5. 5. The container according to claim 3, wherein the average thickness of the body is 0.01 to 1.0 mm.

6. The container according to any one of claims 3 to 5, which has a single layer structure.

7. The container according to any one of claims 3 to 6, which is for medical or food use.

8. The container according to any one of claims 3 to 7, which is an infusion container.

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