JP2764208B2 - Packaging bag for packaging - Google Patents

Description

The present invention relates to paints, adhesives, printing inks, pharmaceuticals, cosmetics,
Useful in various fields such as food, in a package of a multi-component composition to be used immediately before mixing, in order to isolate and incorporate each other component in the package containing an arbitrary component. The present invention relates to a packaging bag for containing a package.

(Prior art) Two-component paints such as polyurethane paints and epoxy resin paints, reactive adhesives such as epoxy resin adhesives, reactive printing inks such as urethane-based flexo or gravure inks, two-component hairs At least two components in industrial fields such as sparkling carbonated beverages comprising a coloring agent, a bicarbonate such as bicarbonate soda and an organic acid such as citric acid, or a pressurized spray container using a gas produced therefrom. There are various multi-component compositions which are composed of and need to be mixed immediately before use. Normally, these compositions are individually packaged for each component, and each use is opened individually and transferred to another container, or put into a container of one component and mixed. Has been used.

In the mixing operation, the contents are easily scattered or spilled out of the container when the components are moved or mixed, so that the mixing ratio often fluctuates and the desired effect cannot be obtained.

In addition, the surrounding environment is contaminated by dissipating the contents outside the container, which is unpleasant because it adheres to the skin and the like, and the contaminated portion is further expanded, which may cause a hygiene problem.

In addition, if it is sufficient to mix each component such as adhesives in the electronic material field, partial gray hair dyeing, home paints / adhesives, sparkling carbonated beverages, etc., the mixing ratio is likely to be inaccurate. There is a problem that loss increases.

As a countermeasure, in a package for packaging a multi-component composition to be mixed immediately before use, each other component is individually stored in an arbitrary number of packaging bags in the package containing at least one optional component. There has been proposed a method of mixing the contents by breaking the built-in packaging bag by an appropriate means at the time of use.

As such a packaging bag for internal use, a packaging bag based on a laminate obtained by laminating an aluminum foil and a plastic film, which are widely used in various application fields such as foods, pharmaceuticals, cosmetics, and toiletries, is used. It is widely used because it has a good balance of various physical properties such as packaging processability, strength, handling properties, light shielding properties, gas blocking properties, water resistance, chemical resistance, heat resistance, and cold resistance.

These packaging substrates are printed on one surface of an aluminum foil or sheet with characters or designs, or coated with a heat-resistant paint without application, or made of polyethylene terephthalate, polycarbonate, nylon or polypropylene. A laminate in which such a heat-resistant plastic film is bonded to form a heat-resistant resin layer and a heat-sealing polyolefin resin layer is provided on the other surface is often used.

There are various forms such as a three-sided seal bag, a four-sided seal bag, a pillow package, a stick package, a pouch package, a strip package, etc. The resin bag is formed as an opposing surface, or the heat-sealing resin layer is overlapped with the surface of the heat-resistant resin layer which is the outer layer of the packaging bag, and a required portion is heat-sealed to form a packaging bag.

When a polyolefin resin film is adhered to the surface of the aluminum foil as a heat-sealing resin layer and a heat-resistant plastic film is adhered to the other surface as a heat-resistant resin layer, it is generally difficult to heat-bond directly. For this reason, a so-called dry lamination method in which the adhesive is applied via a urethane-based or epoxy-based thermosetting adhesive is usually used.

(Problems to be Solved by the Invention) As described above, a conventional heat-sealing laminate for packaging, in which a heat-sealing film or a heat-resistant plastic film and an aluminum foil or sheet are laminated with a urethane-based adhesive, has It is used in various fields including packaging materials for retort foods because it has excellent adhesive strength, good physical properties, especially excellent heat resistance, excellent steam resistance, and good chemical resistance. I have.

However, when used as a packaging bag with a built-in package for the purpose of isolating and packaging each component of a multi-component composition, mixing of the components that have been isolated and stored during long-term storage often causes a problem. ing.

Such compositions include dyes, fragrances for flavoring and deodorizing, preservatives, bactericides, flame retardants, surfactants, catalysts for reactions, organic and inorganic acids and alkalis and organic solvents. It is common to add components with high permeability and corrosiveness, and the separated and stored components have a higher concentration than in the mixed composition, so the erosion and other effects are even stronger. This is because they are easily damaged. In addition, because of the special storage environment called the built-in packaging bag, the cross section of the base material of the packaging bag always contacts any one of the components regardless of the design of the bag making, and the penetration of the component from the cross section occurs. Accordingly, the material constituting each layer of the heat-sealing film and the heat-resistant plastic film or the heat-sealing laminate for packaging in which the heat-resistant coating layer and the aluminum foil are laminated is resistant to the contents of the package regardless of the inner and outer layers. It is necessary to have the same resistance as the adhesive used between the layers and the coating agent on the surface, but the purpose is to satisfy the above conditions and to separate and package each component of the multi-component composition. No use has been made for a packaging bag with built-in packaging that can be stored for a long time.

(Means for Solving the Problems) The present inventors have aimed at isolating and packaging each component of a multi-component composition capable of withstanding erosion and penetration of the component during long-term storage and preventing the migration of the component. As a result of repeated studies with the aim of obtaining a packaging bag for containing a packaging body, a resin layer (A) containing a carboxyl group-modified olefin (co) polymer as a main component on both surfaces of an aluminum foil was carboxyl group-modified. An initial object can be achieved by manufacturing a packaging bag using a composite material provided such that an olefin (co) polymer resin layer is directly in contact with an aluminum foil without an adhesive layer as a base material (D). The inventors have found that the present invention has been completed.

Further, as a second invention, among the resin layers provided on both surfaces of the aluminum foil, the resin layer provided on at least one surface is a resin layer (A) containing the carboxyl group-modified polyolefin (co) polymer as a main component and Olefin (co)
A composite resin layer (C) composed of a resin layer (B) containing a polymer as a main component and provided such that the carboxyl group-modified polyolefin (co) polymer resin layer (A) is in direct contact with the aluminum foil. It was completed. That is, the second
According to the invention, a resin layer (B) is further provided on at least one surface of the resin layers (A) on both surfaces in the first invention.

The carboxyl group-modified olefin (co) polymer, which is the main component of the resin layer (A) constituting the base material (D) of the packaging bag with a built-in package according to the present invention, includes olefins, especially ethylene or propylene (co) polymer. The combined carboxyl group-modified product is suitable, and a non-adhesive film-forming product at room temperature is preferable. It is appropriate that the carboxyl group has a chemically bonded form, and there is no particular limitation on the method for introducing the carboxyl group. That is, (meth) acrylic acid, crotonic acid, maleic acid, fumaric acid, polymerizable unsaturated carboxylic acids such as itaconic acid and citraconic acid or anhydrides thereof are used as copolymerization components in the production of olefin (co) polymers. A copolymerization method, a graft polymerization method to an olefin (co) polymer or a graft copolymerization with another unsaturated polymerizable monomer, or a dicarboxylic acid such as maleic anhydride, fumaric acid or itaconic acid is converted to an olefin (co) polymer. The carboxyl group can be introduced by arbitrarily selecting an ordinary method such as a method of adding to the coalescence. Further, a synthesis method such as a method of introducing a carboxyl group by half-esterifying a hydroxyl group-containing olefin (co) polymer with a polycarboxylic acid such as maleic acid, fumaric acid, and itaconic acid may be used. . Further, the carboxyl group-modified olefin (co) polymer may be copolymerized with another modifying monomer other than the olefin and the carboxyl group-modified monomer. These (co) polymers may be used alone or as a mixture, if necessary, or as a mixture with other (co) polymers or resins.

The olefin (co) polymer which is a main component of the resin layer (B), which is one of the composite resin layers (C) constituting the base material (D) of the packaging bag for packaging a package of the present invention, is ethylene or Preferred are propylene homopolymers and copolymers with other olefins. These (co) polymers have different physical properties due to differences in physical structure such as differences in molecular weight distribution and conformation, and any of them can be used in the method of the present invention. Preferred polyolefin (co) polymers are polyethylene, polypropylene, polybutene-1, poly (4-methylpentene-1), ethylene-propylene copolymer, ethylene-vinyl acetate copolymer, etc. having various structures. The above (co) polymer is used alone or as a mixture, if necessary, or as a mixture with other (co) polymers or resins.

The thickness of each of the resin layers (A) and (B) is preferably thicker in view of various physical properties, but is not necessarily appropriate in terms of economy, workability and handling, and is in the range of several μ to 100 μ. There is no particular limitation.

The aluminum foil used in the packaging bag for storing according to the present invention is not particularly limited, and may be any one generally used as a packaging material. Therefore, if necessary, the thickness can be
100 micron foils can be used, and both hard and soft foils can be used. If necessary, letters, designs, or colored films can be applied to the surface of the aluminum foil by printing or the like using a coating agent or ink resistant to the contents of the package.

A resin layer (A) containing a carboxyl group-modified olefin (co) polymer as a main component or a resin layer (A) containing a carboxyl group-modified olefin (co) polymer as a main component and olefin (co) weight on the surface of the aluminum foil. As a method of laminating a composite resin layer (C) composed of a resin layer (B) mainly composed of a united body and a carboxyl group-modified olefin (co) polymer resin layer so as to be in direct contact with the aluminum foil, an extrusion lamination method is used. A method of laminating each resin layer on an aluminum foil or using a T-die or an inflation extruder to mainly prepare a film of the resin layer (A) mainly composed of a carboxyl group-modified olefin (co) polymer and an olefin (co) polymer. Production of a film of the resin layer (B) as a component, or carboxyl group-modified olefin (co) by co-extrusion Resin layer mainly composed of polymer (A)
A suitable method is to produce a film of a composite resin layer (C) composed of a resin layer (B) containing an olefin (co) polymer as a main component and to heat-bond these films to an aluminum foil. In any case, it is necessary to laminate the aluminum foil and the resin layer (A) containing a carboxyl group-modified olefin (co) polymer as a main component so as to adhere to each other.

For example, the resin layer (A) containing a carboxyl group-modified olefin (co) polymer as a main component of the film of the composite resin layer (C) is brought into contact with an aluminum foil, and the carboxyl group-modified olefin (co) polymer is used as a main component. After lightly press-bonding the resin layer (A) at a temperature equal to or higher than the Vicat softening point and temporarily bonding the obtained laminate to an atmosphere at a temperature equal to or higher than the Vicat softening point, By pressure bonding at a temperature, strong adhesion between the resin layer (A) containing a carboxyl group-modified olefin (co) polymer as a main component and the aluminum foil can be obtained.

In the production of the packaging bag for containing a package of the present invention, a resin layer (A) or a carboxyl group-modified olefin (co) polymer mainly containing a carboxyl group-modified olefin (co) polymer is mainly provided on both sides of the aluminum foil. A composite resin layer (C) composed of a resin layer (A) as a component and a resin layer (B) containing an olefin (co) polymer as a main component is directly bonded to an aluminum layer by a carboxyl group-modified olefin (co) polymer resin layer. The composite material provided so as to be in contact with the foil is used as a packaging base material (D), and a processing method such as a sealing method is performed by an ordinary method using a general packaging machine.

(Function and Effect) The carboxyl group-modified olefin (co) polymer, which is the main component of the resin layer (A) constituting the base material (D) of the packaging bag with a built-in packaging body of the present invention, has particularly good adhesion to aluminum foil. It has a low activity to various organic and inorganic chemicals, and is a major component and additive of the package in various fields, for example, dyeing, pigment, fragrance, preservative, antifungal agent,
Since it is hardly attacked by disinfectants, flame retardants, surfactants, catalysts, organic and inorganic acids and alkalis, it is suitable as the outer surface layer of the base material (D) of the packaging bag. Since it is excellent in heat sealing property with respect to olefin-based plastic, it is highly effective when used as a heat sealing resin layer on the inner surface.

The olefin (co) polymer which is a main component of one resin layer (B) of the composite resin layer (C) constituting the base material (D) of the packaging bag with a built-in package according to the present invention is used in the above-mentioned various fields. The resistance to the main contents and additives of the packaging bag is very high,
By selecting the physical structure and the type and amount of the comonomer in the copolymerization, a resin layer exhibiting heat sealing properties or a heat-resistant resin layer can be obtained. Therefore, a heat-resistant resin layer mainly composed of an olefin (co) polymer may be laminated on the resin layer (A) mainly containing a carboxyl group-modified olefin (co) polymer, or a heat-resistant resin layer. Can be used as a heat sealing layer.

The base material (D) of the packaging bag with a built-in package according to the present invention can be processed into a packaging bag by heat sealing by making any surface of the resin layer heat-sealing properties, thereby constituting the base material (D). Since the resin layer and the aluminum foil are directly adhered to each other, erosion and destruction from the cross section of the base material by the contents of the package do not occur.

 Hereinafter, the present invention will be described in more detail with reference to examples.

Example 1 Production of Film 1 (Film of Resin Layer (A)): Admer NE070 (Carboxyl group-modified linear low density polyethylene manufactured by Mitsui Petrochemical Industries, Ltd .; Vicat softening point 87)
C. and a melt index of 1.0) were used to produce a 30 μm thick film at a cylinder temperature of 160 ° C. and a die temperature of 197 ° C. using an inflation film extruder.

Production of film 2 (film of resin layer (C)): Admer NE070 described in the example of film 1 was used as a component of resin layer (A), and UP was used as a component of resin layer (B).
Polypropylene FM201-F (Polypropylene manufactured by Union Polymer Co., Ltd .; Vicat softening point 135 ° C, melt index
8.0) was used to produce a film at a cylinder temperature of 165 ° C. and a die temperature of 200 ° C. using a two-layer blown extruder. The film thickness of the obtained composite resin layer (C) was 40 μm, and the thickness of each of the resin layers (A) and (B) was 20 μm.

Manufacture of packaging base material (D1): A heat roller made of scale and a silicone rubber impression cylinder set at 170 ° C. by contacting the resin layer (A) side of film 2 with one side of a soft aluminum foil having a thickness of 20 μm. After being temporarily bonded at a pressure of about 4 kg / m using a press roll made of, the laminate was held in a heating furnace at an ambient temperature of 170 ° C. for 10 seconds, and further pressed and laminated with a press roll set under the same conditions as above.

Next, the film 1 is laminated on the other side of the aluminum foil of the laminate in the same manner as the laminating operation of the film 2,
The intended packaging substrate (D1) was obtained.

Heat sealing strength test: The obtained packaging base material (D1) was heat-sealed at 180 ° C. under the conditions of a pressure of 3 kg / cm 2 and a pressure of 3 kg / cm 2 for 1 second between the films 1 and the films 1 and 2 respectively. These samples were measured at a peel speed of 200 m / min with a 180-degree peel strength.
The substrate fracture occurred beyond g. In the case of the first and second films, 1800 g. Showed sufficient heat sealing strength.

Chemical resistance test: Use the same sample as the one subjected to the heat sealing test described above.
The packaging substrate (D1) cut to a size of cm × 10 cm was formed into a cylindrical shape so that one surface of the film became the inner surface, and heat-sealed with a width of 5 mm so that the one surface of the film overlapped the two surfaces of the film to form a cylinder. Similarly, both ends of the cylinder were heat-sealed with a width of 5 mm to form a heat-sealed portion on one side of the film, thereby forming a pillow packaging bag.

The pillow packaging bags contain 10% hydrochloric acid, 10% caustic soda, methanol, 60% ethanol, toluene, methyl ethyl ketone, ethyl acetate, p-toluenesulfonic acid (5
% Xylene / butanol solution), orange oil, lemon oil, sodium benzoate (5% aqueous solution), sodium laurate (2% aqueous solution), neutral surfactant (nonylphenol type, HLB = 17, 10% aqueous solution) In advance, and then immersed in the same chemical solution as the sealed one, at 40 ° C.
After standing for 3 months, the state of the packaging substrate (D) and the heat sealed portion thereof were observed.

No clear change was observed on the surface or interface of each layer of the packaging base material and the heat sealed portion, and the adhesion between the layers was maintained.

[Comparative Example 1] Production of film 2 ': UP Polypropylene FM used in Example 1 as resin layer (C)
201-F (Polypropylene manufactured by Union Polymer Co., Ltd .;
A single-layer film having a Vicat softening point of 135 ° C and a melt index of 8.0) was produced by an inflation extruder at a cylinder temperature of 165 ° C and a die temperature of 200 ° C. The thickness of the obtained film was 20 μm.

Production of packaging base material (D1 '): Two-part polyurethane-based dry lamination adhesive (Takerac, Takeda Pharmaceutical Co., Ltd.) on one side of the same aluminum foil used in Example 1 A310 / Takenate A-3) was used for lamination according to the usual process.

Next, Example 1 was applied to the other surface of the aluminum foil of the laminate.
The film 1 is laminated using a dry lamination adhesive in the same manner as the film 2 ', and the packaging substrate (D
1 ').

Heat sealing strength test: The obtained packaging base material (D1 ') was used for the film 1 side and the film 1 side and the film 2' side respectively in Example 1.
And heat sealed. These samples were measured at a peeling speed of 200 m / min with a 180-degree peeling strength. In the case of one film, the heat sealing strength was large and exceeded 2000 g. The surface also showed a large value of 1960 g.

Chemical resistance test: A pillow packaging bag was prepared in the same manner as in Example 1 using the same sample subjected to the heat sealing test described above, and a chemical resistance test was performed in the same manner.

No significant change was observed in the aluminum foil and films 1 and 2 ', but the adhesive layer for dry lamination lost its adhesive strength or peeled off when immersed in a chemical solution other than sodium benzoate. .

Example 2 Production of Film 3 (Film of Resin Layer (A)): Performed from pellets of Admer QE050 (carboxyl-modified polypropylene manufactured by Mitsui Petrochemical Industries, Ltd .; Vicat softening point 120 ° C., melt index 27.0). A 30 μm thick film was produced using a blown film extruder in the same manner as in the production of Film 1 in Example 1.

Production of packaging base material (D2): The resin layer (A) side of the film 2 of Example 1 was treated on one surface of a soft aluminum foil having a thickness of 20 μm in the same manner as in Example 1, and was pressed and laminated with a press roll. .

Next, the film 3 was laminated on the other surface of the aluminum foil of the laminate in the same manner as the laminating operation of the film 2 to obtain a target packaging substrate (D2).

Heat sealing strength test: The obtained packaging base material (D2) was subjected to a pressure of 3 kg / cm2 between the three films and between the three films and the two films.
For 1 second at 180 ° C. The 180 ° peel strength of these samples was measured at a peel speed of 200 m / min.
Substrate failure occurred in excess of 00 g. In the case of the 3rd and 2nd films, more than 2000 g. Of the substrate was broken.

Chemical resistance test: The same sample as that subjected to the above-mentioned heat sealing test was used in Example 1.
A chemical resistance test was performed with each of the chemical solutions in the same manner as in the above.

No clear change was observed on the surface or interface of each layer of the packaging base material and the heat sealed portion, and the adhesion between the layers was maintained.

Claims (2)

(57) [Claims] 1. A packaging bag for a multi-component composition to be mixed at the time of use, wherein the packaging bag contains at least one component and contains and incorporates another component. A composite material comprising, on both sides of an aluminum foil, a resin layer (A) having a carboxyl group-modified polyolefin (co) polymer as a main component, and the resin layer (A) provided directly on the aluminum foil, A packaging bag for internal use, which is used as a substrate (D). 2. A resin layer provided on at least one of the resin layers provided on both surfaces of the aluminum foil, wherein the resin layer (A) mainly containing the carboxyl group-modified polyolefin (co) polymer and the olefin ( A composite resin layer (C) comprising a resin layer (B) containing a (co) polymer as a main component, and a resin layer (A) containing a carboxyl group-modified polyolefin (co) polymer as a main component is directly formed on an aluminum foil. The built-in packaging bag according to claim 1, wherein the packaging bag is provided so as to be in contact with the packaging bag.