JP2007308203A - Container packaging film, and sealant film, lamination, container packaging bag, and container package using this container packaging film - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a resin composition preferable for use in a container packaging film that is superior in appearance and resistance against mutual adhesion and eliminates a concern of the ingress of a foreign matter into a content article in a container. <P>SOLUTION: The resin composition contains a propylene polymer of 40 to 90 mass% and a high-density polyethylene of 10 to 60 mass% under the condition that a ratio between the MFR of the propylene polymer at 230°C and that of the high-density polyethylene at 190°C is 5 to 200, and contains virtually no lubricant and an antiblocking agent. This resin composition is used for a container packaging film, a sealant film, a lamination, a container packaging bag, and a container package. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a container packaging film or the like used for a container packaging bag for storing and packaging a container filled with food or medicine. In particular, a container packaging film having excellent anti-adhesiveness (anti-blocking property) after high-pressure steam sterilization between a container and a container packaging bag, and excellent in appearance, a sealant film using the film, a laminate, a container packaging bag, and The present invention relates to a container package.

  2. Description of the Related Art Conventionally, containers filled with food or medicine are stored and packaged in container packaging bags. The purpose of packaging varies depending on the application, but it is mainly intended to protect the container itself, such as preventing damage to the container surface, preventing mechanical damage to the container itself, preventing oxygen permeation, preventing ultraviolet light transmission, etc. Containers and packaging bags are used for many purposes, such as for the purpose of explaining the contents of a container, such as the contents by printing and the specification of handling standards.

  When packaging containers in containers and packaging bags, a problem often occurs between the containers and the container packaging bags during storage of the packaged containers in a warehouse, or the peripheral portion of the container packaging bags that are not in contact with the containers It is difficult for the containers to be taken out from the container packaging bag when used. In recent years, from the viewpoint of safety and hygiene, there is an increasing number of cases where a container package in which a container is packaged in a container packaging bag is used after high-pressure steam sterilization. In addition, in order to increase the productivity, the autoclave sterilization temperature is increased and the autoclave sterilization time is shortened. Since mutual adhesion is likely to occur at higher temperatures, it is required as a major technical problem for containers and packages to solve this mutual adhesion problem. If the container is a medical container, the container packaging is depressurized in order to maintain the quality of the container contents in a more stable and constant quality, and the volume of the space between the medical container and the container packaging bag is reduced. Since the high pressure steam sterilization is performed in a state where the container packaging bag and the medical container are in close contact with each other, the container package has come to be used under a condition in which mutual adhesion easily occurs.

  As one method for preventing mutual adhesion, conventionally, when selecting the material of the contact surface between the container and the container packaging bag, a method using a different material and a material having a high melting point or glass transition temperature and a high heat resistance. The method using the thing etc. has been taken. These methods are effective methods, but on the other hand, there is a problem because the material and configuration of the container and film are limited. For example, in order to form a container packaging film by forming a container packaging film into a bag shape, a general method of heat fusion is accepted as the cheapest method in the world, and a container packaging bag suitable for this heat fusion As such materials, propylene-based or ethylene-based polymers, so-called polyolefins are widely used. Adding restrictions to this is not preferable because there is a big problem in terms of economy.

  Another method for preventing mutual adhesion is to physically roughen the surface of the heat-sealing layer of the film as in the case of wrapping a polyolefin-based container with a film having a polyolefin resin as a heat-sealing layer, for example, There is a way to reduce the contact area. As specific examples of such a method, there are a method of roughening a film by subjecting it to an uneven surface (for example, see Patent Document 1), and a method of applying physical deformation to the film by embossing or embossing. Moreover, as a method of using a specific resin composition, a method of using a polymer composition of polybutene-1 and polypropylene and / or poly-4-methylpentene-1 on the inner surface of a container packaging bag (for example, Patent Documents). 2) and the like. Furthermore, there is a method of adding an additive to the polyolefin constituting the heat-sealing surface of the film. Many additives are used as inorganic fillers such as silica and talc, organic anti-blocking agents such as spherical cross-linkable polymethyl methacrylate, metal soap lubricants such as calcium stearate, and slip agents for films such as erucic acid amide. There are fatty acid amide-based lubricants used.

  However, these methods have been problematic in that the appearance of the film deteriorates or the additive bleeds and adheres to the container. Moreover, when the temperature of autoclaving became 121 degreeC or more, anti-tackiness was inadequate. In particular, depending on the material of the container, additives such as high pressure steam sterilization performed while the container is in intimate contact with the container packaging bag may cause the additive contained in the container packaging bag to pass through the container wall and become contaminated. Therefore, there has been a demand for a container and packaging bag that is excellent in appearance and excellent in anti-adhesion property without substantially using an additive.

JP-A-5-309124 JP-A-5-31156

  The present invention has been made in view of such circumstances, and is mainly intended to provide a container packaging film made of a polyolefin-based material, excellent in appearance and anti-adhesiveness, and free from the risk of contamination of container contents. To be an important issue. Moreover, this invention makes it a subject to provide the sealant film, laminated body, container packaging bag, and container packaging body which used the film for container packaging of this invention. The reason why such preferable characteristics are imparted is not clear, but the container packaging film according to the present invention does not substantially contain an antiblocking agent by using a resin composition comprising a specific polyolefin material. In both cases, the surface is uniformly roughened, and the contact area with the container is reduced.

  As a result of intensive studies for solving the above problems, the present inventors made a resin composition combined with a specific polyolefin resin as a container packaging film, and solved the above problems by using it on the surface in contact with the container. The present inventors have found what can be done and have completed the present invention. That is, this invention relates to the resin composition shown by the following (1)-(10), the film for container packaging using the same, a sealant film, a laminated body, a container packaging bag, and a container packaging body.

(1) 90 to 40% by mass of a propylene-based polymer and 10 to 60% by mass of a high-density polyethylene (a total of 100% by mass of the propylene-based polymer and the high-density polyethylene). A resin composition, wherein the ratio of MFR at 190 ° C. to MFR at 190 ° C. of high-density polyethylene is from 5 to 200, and contains substantially no lubricant and antiblocking agent.
(2) A container packaging film comprising a resin composition containing a propylene-based polymer and high-density polyethylene and substantially free of a lubricant and an antiblocking agent, and a container after high-pressure steam sterilization at 125 ° C. for 30 minutes A container packaging film having a coefficient of dynamic friction between packaging films of 0.4 or less.
(3) The resin composition contains 90 to 40% by mass of a propylene polymer and 10 to 60% by mass of high-density polyethylene (a total of 100% by mass of the propylene polymer and high-density polyethylene). The ratio of MFR at 230 ° C. of a propylene polymer to MFR at 190 ° C. of high-density polyethylene is 5 to 200. The container packaging film according to (2),
(4) A sealant film comprising a support layer and a sealant layer, wherein the container packaging film according to (2) or (3) is used as a sealant layer.

(5) The container packaging film according to (2) or (3) or at least one selected from the group consisting of a sealant film according to (4), a gas barrier layer, a printing layer, and a protective layer A laminate having a layer.
(6) A container packaging bag, wherein the contact surface with the container is the container packaging film according to (2) or (3).
(7) A container package, wherein the container is accommodated in the container packaging bag described in (6) and sterilized under high pressure steam.

(8) The container package according to (7), wherein the temperature of autoclaving is 121 ° C. or higher.
(9) The container package according to (7) or (8), wherein the container is a medical container.
(10) The container package according to any one of (7) to (9), wherein the outer surface of the container that comes into contact with the container package bag is made of a propylene-based polymer.

  As described above in detail, the container packaging film of the present invention is made of an inexpensive polyolefin, has a low cost, and is excellent in appearance and anti-adhesiveness. Therefore, it is easy to take out the container when it is used as a container packaging bag. Further, since it does not substantially contain a plasticizer and an anti-blocking agent, there is no fear of contaminating the container, and it can be used and useful in the field of container packaging such as medical container packaging.

Hereinafter, the present invention will be described in detail.
The propylene-based polymer used in the present invention is a propylene homopolymer or a propylene / α-olefin copolymer containing propylene and an α-olefin other than propylene having 2 to 20 carbon atoms. Examples of the α-olefin include ethylene, 1-butene, 1-pentene, 1-hexene, 4-methylpentene-1, 1-octene, 1-decene, 1-dodecene, and the like, one or more of these Used in combination. Among these α-olefins, ethylene, 1-butene, 1-pentene, 1-hexene, 4-methylpentene-1, 1-octene are preferable, and ethylene is more preferable. Examples of the type of copolymer include a random copolymer or a so-called block copolymer generally referred to as a high-impact polypropylene, and has excellent interlayer adhesion strength and flexibility when used as a sealant film described later. Therefore, block copolymers are preferred. The catalyst used for producing the propylene polymer is not particularly limited, and a metallocene catalyst can be used in addition to the conventional Ziegler-Natta catalyst. These can be produced by various production processes such as a bulk method, a solution method, a slurry method, and a gas phase method.

  The MFR (melt flow rate) measured under conditions of a temperature of 230 ° C. and a load of 21.18 N in accordance with JIS K 7210 of a propylene-based polymer is preferably 0.1 to 50 g / 10 minutes. If the MFR is less than this range, the moldability tends to decrease. On the other hand, if the MFR exceeds this range, the strength and heat-fusibility tend to decrease. A more preferable MFR range is 0.1 to 20 g / 10 min, and even more preferably 0.25 to 20 g / 10 min.

  The high density polyethylene used in the present invention is an ethylene homopolymer or an ethylene / α-olefin copolymer containing ethylene and an α-olefin having 3 to 20 carbon atoms. Preferred examples of the α-olefin include propylene, 1-butene, 1-pentene, 1-hexene, 4-methylpentene-1, 1-octene, 1-decene, 1-dodecene, and the like. Used in combination with more than one species. Of these α-olefins, 1-butene, 1-pentene, 1-hexene, 4-methylpentene-1, and 1-octene are more preferable.

The density of high-density polyethylene used in the present invention is usually 0.940 g / cm ³ or more, preferably 0.945 g / cm ³ or more, more preferably 0.950 g / cm ³ or more. The upper limit is not particularly limited, but is about 0.965 g / cm ³ . When the density is less than 0.940 g / cm ³ , the anti-tackiness tends to be inferior, and the decrease in anti-tackiness at the time of sterilization particularly at a temperature exceeding 121 ° C. tends to be large.

  The MFR measured under conditions of a temperature of 190 ° C. and a load of 21.18 N in accordance with JIS K 7210 of high density polyethylene is preferably 0.05 to 50 g / 10 min. When the MFR is within this range, the melt tension of the resin composition is in an appropriate range, and the film can be easily formed. A more preferable MFR range is 0.05 to 20 g / 10 min, and even more preferably 0.1 to 10 g / 10 min.

  The blending ratio of the propylene-based polymer and the high-density polyethylene in the resin composition of the present invention is such that the propylene-based polymer is 90 to 40% by mass when the total amount of the propylene-based polymer and the high-density polyethylene is 100% by mass. It is a range, Preferably it is 60-80 mass%. When the blending ratio of the propylene polymer is less than 40% by mass, the appearance of the container packaging film deteriorates or the heat resistance is insufficient. On the other hand, when the blending ratio of the propylene polymer exceeds 90% by mass, Wearability decreases.

  The ratio [MFR (PP) / MFR (HD)] of the MFR [MFR (PP)] of the propylene polymer and the MFR [MFR (HD)] of the high-density polyethylene in the resin composition of the present invention is 5 to 200. Yes, preferably 10 to 100, more preferably 15 to 50. If MFR (PP) / MFR (HD) is less than 5, anti-tackiness may not be sufficient, and if it exceeds 200, problems such as gel and fish eyes are likely to occur in the container packaging film. And problems with the appearance of the film.

  The film for container packaging of the present invention is a film for container packaging comprising a resin composition containing a propylene-based polymer and high-density polyethylene and substantially free of a lubricant and an antiblocking agent, and is at 125 ° C. for 30 minutes. The coefficient of dynamic friction between containers and packaging films after high-pressure steam sterilization is 0.4 or less. Here, the dynamic friction coefficient is a value measured according to JIS K 7125. When the dynamic friction coefficient is 0.4 or less, the opening property of the container packaging bag is improved, and the container can be easily taken out from the container package. Also, the dynamic friction coefficient tends to decrease by decreasing the blending ratio of high density polyethylene. Furthermore, a container packaging film made of the resin composition of the present invention is excellent in heat resistance and extremely excellent in anti-tackiness.

  The method for obtaining the container packaging film of the present invention is not particularly limited. For example, after mixing each component used in the resin composition of the present invention with a mixer such as a mixing roll, a Banbury mixer, a Henschel, a tumbler, and a ribbon blender. It can be obtained by a method of forming into pellets once using an extruder or the like and then forming them by various film forming methods. Examples of the film forming method include water-cooled or air-cooled extrusion inflation method, T-die method and the like. Moreover, the thickness of the film for container packaging of this invention can be 30-300 micrometers, Preferably it can be 30-200 micrometers.

  Although the container packaging film of the present invention can be used as a single layer sealant film, the container packaging film can be used as a sealant layer, and can also be used as a sealant film laminated with a support layer. Thus, a sealant film having high transparency and high smoothness on the support layer side can be obtained. Although it does not specifically limit as a support layer, General polyolefin, such as an ethylene polymer and a propylene polymer, can be used. Of these, a propylene-based polymer is preferable because of its high heat resistance. Examples of the propylene polymer include homopolypropylene, propylene / ethylene random copolymer, and propylene / ethylene block copolymer. Among these, propylene / ethylene block copolymer is preferable because of excellent impact resistance. The thickness ratio of the support layer to the sealant layer is preferably support layer / sealant layer = 50 to 95/5 to 50.

  The laminate of the present invention has a layer comprising the container packaging film or sealant film of the present invention and at least one layer selected from the group consisting of a gas barrier layer, a printing layer and a protective layer. Although it does not specifically limit as a raw material used for a gas barrier layer, a printing layer, and a protective layer, Specifically, polyethylene, a polypropylene, ethylene-vinyl acetate copolymer saponified material (EVOH), aluminum foil, 2 Examples thereof include axially stretched or unstretched polyamide, biaxially stretched or unstretched polyethylene terephthalate (PET) or polyethylene naphthalate (PEN), aluminum oxide-deposited PET, and silica-deposited PET.

  Various known molding methods can be used for obtaining the laminate of the present invention. Specifically, a water-cooled or air-cooled (co) extruded (multilayer) inflation method, a (co) extruded (multilayer) T-die method, a method of simultaneously forming a plurality of layers by melt molding, and a dry laminate method, respectively. A method of forming a single layer film or sheet and laminating it using an adhesive or the like, a method of pre-molding one film or sheet like the extrusion laminating method and melt laminating the other on it Can be mentioned. Among these, it is more preferable to use a water-cooled (co) extrusion (multilayer) inflation molding method and a (co) extrusion (multilayer) T-die molding method.

  The container packaging bag of the present invention is a container packaging film or sealant film of the present invention made into a bag by heat fusion, and the surface in contact with the container is a container packaging film made of the resin composition of the present invention. When the container is stored and packaged, it does not adhere to the container and the appearance is good. In order to obtain a container packaging bag, the container packaging film, sealant film or laminate of the present invention can be used, and a method of fusing using heat, high frequency, ultrasonic waves or the like to process into a bag shape can be used. . Moreover, it can also be made into a container shape from the beginning using the hollow molding method etc. using the method which obtains a container by vacuum forming, and the resin composition of this invention. Furthermore, it goes without saying that unevenness processing may be applied to the surface of the container packaging film depending on the application.

  The container package of the present invention is a container packaged in the container packaging bag of the present invention and sterilized under high pressure steam. For the high pressure steam sterilization, methods such as submersion type and spray type which are usually used in the retort field, the medical field and the like are used. Particularly in recent years, from the viewpoint of improving productivity, maintaining the flavor of food, improving sterilization, etc., the high-pressure steam sterilization temperature, which was conventionally about 100 to 115 ° C., has been increased, and a high-pressure steam sterilization temperature of 121 ° C. or higher has been adopted. As the material of the container, a propylene polymer having high heat resistance is used from polyethylene, vinyl chloride, etc., and the container is packaged and subjected to high-pressure steam sterilization. The container includes a single layer container made of a single material, a multilayer container made of various materials, and the like, and in any case, an adhesive layer may be provided as necessary. As a material of the container, a polyolefin resin is often used from the viewpoint of moldability and economy. The container package of the present invention containing these containers is excellent in heat resistance, extremely excellent in anti-adhesion after high-pressure steam sterilization at 121 ° C. or higher, and excellent in anti-adhesion after high-pressure steam sterilization at 125 ° C. ing. In particular, when the container is made of a flexible polyolefin resin sheet or film, the container and packaging bag are likely to adhere to each other, but the container package of the present invention hardly causes mutual adhesion. Absent. Furthermore, in the case of film bags, blow bags, blow bottles, etc. used as medical containers for high calorie infusion, peritoneal dialysis infusion (CAPD), etc., the container of the present invention is free from the risk of bleeding of lubricants and antiblocking agents. This is a preferred embodiment of the package.

  In addition, the surface of the container of the present invention that is in direct contact with the container packaging bag, that is, the outer surface of the container made of a propylene-based polymer is a copolymer component of ethylene or butene-1 in order to impart flexibility to the container. The propylene-based copolymers, styrene-based elastomers, and olefin-based elastomers added with elastomer components may be used. Since it is easy to adhere to each other as compared with the coalescence, the effect of the container / packaging body excellent in anti-tackiness of the present invention is more clearly exhibited.

  It goes without saying that other polymers can be blended in the resin composition comprising the specific pyropyrene-based polymer and high-density polyethylene in the present invention without impairing the object of the present invention. Specific examples of such polymers include so-called high pressure method low density polyethylene, linear low density polyethylene, various styrene elastomers such as ethylene / α-olefin elastomer, styrene / butadiene elastomer, ethylene / vinyl acetate copolymer, Examples include, but are not limited to, ethylene / (meth) acrylic acid ester copolymers, ethylene / (meth) acrylic acid copolymers, and ionomers thereof. The blending amount of the other polymer is 40% by mass or less, preferably 20% by mass or less, based on the entire resin composition of the present invention. In particular, when the blending amount of the styrene-based elastomer other than the polyolefin is increased, the heat seal strength of the heat-sealed portion of the container packaging bag tends to be lowered.

  Furthermore, within the range where the effects of the present invention are not significantly impaired, the sealant film, laminate and container packaging bag of the present invention are organic or inorganic for the purpose of improving the strength, reducing the volume and reducing the calorie at the time of combustion disposal. Add fillers and other commonly used known additives such as antistatic agents, antioxidants, antifogging agents, organic or inorganic pigments, UV absorbers, dispersants, etc. can do. However, it is necessary that the resin composition and the container packaging film of the present invention contain substantially no lubricant and antiblocking agent. Here, “substantially free” means that the lubricant and the anti-blocking agent may be included so long as they do not bleed. Specifically, the anti-blocking agent is 4000 ppm or less and the lubricant is 4000 ppm or less. More preferably, the antiblocking agent is 1000 ppm or less, the lubricant is 1000 ppm or less, and most preferably it is not contained at all.

(Example)
EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples and comparative examples, but the present invention is not limited to the examples.

The propylene polymer and high density polyethylene used are shown below. The MFR of the propylene-based polymer was measured at a temperature of 230 ° C. and a load of 21.18 N according to JIS K 7210. The MFR of the high density polyethylene was measured at a temperature of 190 ° C. and a load of 21.18 N in accordance with JIS K 7210.
(Propylene polymer)
A1: Propylene homopolymer of MFR 15 g / 10 min A2: Propylene / ethylene random copolymer of MFR 5 g / 10 min, ethylene content 4.3% by mass
A3: MFR 2.2 g / 10 min propylene / ethylene block copolymer (high density polyethylene)
B1: MFR 1 g / 10 min, density 0.960 g / cm ³
B2: MFR 0.6 g / 10 min, density 0.955 g / cm ³
(Additive)
C1: Aluminosilicate (silica-based antiblocking agent)
C2: Polymethyl methacrylate (PMMA) anti-blocking agent

The physical property measuring method is shown below.
(Dynamic friction coefficient)
1000 mL of water was put into a container packaging bag having an inner size of 30 × 30 cm and heat-sealed in three directions, and sealed by heat-sealing to prepare a water-containing container packaging bag. This water-filled container packaging bag was sterilized at 125 ° C. for 30 minutes using a spray-type high-pressure steam sterilizer, then opened and drained, and then air-dried between the inner surfaces of the container packaging bag. The dynamic friction coefficient was measured in accordance with JIS K 7125 using a measuring device (manufactured by Toyo Seiki, friction tester TR type) under an environment of 23 ° C. × 50% RH.

A sample preparation method is shown below.
(container)
The propylene / ethylene random copolymer of A2 was molded at a temperature of 230 ° C. using a T-die film molding apparatus to obtain a film having a thickness of 200 μm. This film was cut into a 20 cm × 20 cm square, and two sheets were joined together, and the three ends were thermally fused at a temperature of 180 ° C., a pressure of 0.2 MPa, a time of 1 second, and a fusion width of 10 mm to obtain a container. This container was filled with 1 L of distilled water, and the remaining one was heat-sealed to obtain a container sample.
(Container packaging film, container packaging bag, container packaging and high-pressure steam sterilization)
A propylene-based polymer, high-density polyethylene and additives were mixed in the composition shown in Table 1 with a Henschel mixer and molded at a temperature of 230 ° C. with a T-die molding machine to obtain a 70 μm container packaging film. This film was cut into a 35 cm square, and two sheets were stacked, and the three sides were heat-sealed at a temperature of 180 ° C., a pressure of 0.2 MPa for 1 second, and a fusion width of 10 mm to prepare a container packaging bag. The container sample was stored in the container, and the inside of the film was decompressed with a vacuum pump while the remaining one of the film was heat-sealed to obtain a container package.
This container / package was sterilized at 125 ° C. for 30 minutes using a spray-type high-pressure steam sterilizer.

The evaluation method is shown below.
(appearance)
Take out the container from the container package after high-pressure steam sterilization, divide the 30cm x 30cm area of the container packaging bag into nine 10cm x 10cm areas, visually observe the rough state of the inner and outer surfaces, and make a uniform ground glass shape The number of compartments having a good appearance and the number of compartments having an uneven surface and poor appearance were counted and evaluated according to the following criteria.
○: The number of compartments having a good appearance is 7 to 9
Δ: The number of compartments having a good appearance is 4 to 6
X: The number of sections having a good appearance is 0 to 3

(Anti-reciprocity)
The container packaging body after high-pressure steam sterilization was opened, and the following criteria were evaluated when the container was manually removed from the container packaging body.
○: The container packaging bag is not scratched at all and can be easily taken out without resistance.
(Triangle | delta): Although a part of container and a part of container packaging bag are adhering weakly, it can take out easily.
X: A part of the container is strongly attached to the container packaging bag and is difficult to take out.
(Film impact)
Using a film obtained by cutting a container packaging bag produced by high-pressure steam sterilization in the same manner as the measurement of the dynamic friction coefficient, the film was measured in an environment of 23 ° C. × 50% RH in accordance with JIS P8184.

(Examples 1-5, Comparative Examples 1-5)
A container packaging film, a container packaging bag, and a container packaging body were prepared using the resin compositions of the types and blending amounts shown in Table 1. Table 1 shows the results of evaluating the appearance and anti-interbonding properties.
(Examples 6 and 7)
A resin composition of the same type and blending amount as in Example 1 is used for the sealant layer, and a two-layer sealant film using the propylene-based polymer shown in Table 2 is used for the support layer. Obtained by molding. The results of evaluating the film impact are shown in Table 2.

Claims (13)

A film for container packaging composed of a film molding material of a resin composition substantially free from a lubricant and an antiblocking agent,
A propylene polymer composed of a propylene homopolymer or a propylene / α-olefin copolymer containing propylene and an α-olefin other than propylene having 2 to 20 carbon atoms, and an ethylene homopolymer. Alternatively, it is an ethylene / α-olefin copolymer containing ethylene and an α-olefin having 3 to 20 carbon atoms, and is substantially composed of two components of high density polyethylene having a density of 0.940 g / cm ³ or more. A film for container packaging, wherein the coefficient of dynamic friction between the films for container packaging after high-pressure steam sterilization at 125 ° C. for 30 minutes is 0.4 or less.   The blending ratio of the resin composition is 90 to 40% by mass of the propylene polymer, 10 to 60% by mass of the high density polyethylene, MFR of the propylene polymer at 230 ° C. and 190 ° C. of the high density polyethylene. The container packaging film according to claim 1, wherein the ratio to MFR is 5 to 200.   A sealant film comprising a sealant layer and a support layer supporting the sealant layer, wherein the sealant film is the container packaging film according to claim 1 or 2.   The sealant film according to claim 3, wherein the support layer is made of a propylene / ethylene block copolymer. A container packaging bag obtained by processing a film for container packaging composed of a sealant layer and a support layer supporting the sealant layer into a bag shape,
The sealant layer is made of a film molding material of a resin composition substantially free from a lubricant and an antiblocking agent, and the resin composition is made of a propylene homopolymer or propylene other than propylene and propylene having 2 to 20 carbon atoms. Propylene polymer comprising propylene / α-olefin copolymer containing α-olefin and ethylene homopolymer or ethylene / α-olefin copolymer containing ethylene and α-olefin having 3 to 20 carbon atoms And a density of 0.940 g / cm ³ or more, and substantially composed of two components, the blending ratio of the resin composition is 90 to 40% by mass of the propylene polymer, and the high density polyethylene. The MFR at 230 ° C. of the propylene polymer and the MF at 190 ° C. of the high density polyethylene Packaging bag ratio of is characterized in that 5 to 200.   The container packaging bag according to claim 5, wherein the support layer is made of a propylene / ethylene block copolymer. A laminate having a sealant film and a sealant film comprising a support layer supporting the sealant layer, and at least one layer selected from the group consisting of a gas barrier layer, a printing layer and a protective layer,
The sealant layer is made of a film molding material of a resin composition substantially free from a lubricant and an antiblocking agent, and the resin composition is made of a propylene homopolymer or propylene other than propylene and propylene having 2 to 20 carbon atoms. Propylene polymer comprising propylene / α-olefin copolymer containing α-olefin and ethylene homopolymer or ethylene / α-olefin copolymer containing ethylene and α-olefin having 3 to 20 carbon atoms And a density of 0.940 g / cm ³ or more, and substantially composed of two components, the blending ratio of the resin composition is 90 to 40% by mass of the propylene polymer, and the high density polyethylene. The MFR at 230 ° C. of the propylene polymer and the MF at 190 ° C. of the high density polyethylene Laminate, wherein the ratio of is 5-200.   The laminate according to claim 7, wherein the support layer is made of a propylene / ethylene block copolymer.   A container packaging bag, wherein the laminate according to claim 7 or 8 is processed into a bag shape.   A container packaged body, wherein the container is accommodated in the container packaging bag according to claim 5 or 9, and high-pressure steam sterilized.   The container package according to claim 10, wherein the temperature of the high-pressure steam sterilization is 121 ° C or higher.   The container package according to claim 10 or 11, wherein the container is a medical container.   14. The container package according to claim 10, wherein an outer surface of the container that comes into contact with the container package bag is made of a propylene-based polymer.