JP3250683B2 - Packaging material with excellent chemical resistance - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packaging material having excellent chemical resistance used for containers for various chemicals such as a photographic developer.

[0002]

2. Description of the Related Art In general, packaging materials used for various containers are often selected with an emphasis on having a barrier property to the contents, and particularly for preserving contents such as foods. In addition, a high barrier layer including a barrier property against oxygen, water vapor and the like is used. As such a barrier layer, generally, a metal foil such as aluminum, a polyvinylidene chloride-coated resin film, a film obtained by depositing an inorganic substance such as silicon oxide, or the like is used, and these are laminated on the inside and outside using an adhesive. Was normal.

[0003] However, when such a packaging material is used, the resistance to the organic solvent contained in the contents of the barrier layer and the pH of the contents are not particularly considered. Even if the pH of the content is acidic or alkaline, its value is limited in advance, so it is possible to design and use a packaging material using a barrier layer according to this. Met.

[0004]

However, when these packaging materials are to be applied to various chemicals and the like,
That is, when the pH value can vary widely from an acidic region to an alkaline region, a packaging material that can be applied only to a specific pH region is insufficient. In particular, when having a barrier layer as described above, the volatile components of the contents stay near the barrier layer, especially between the layers in the barrier layer, thereby attacking the adhesive, corroding metals such as aluminum, and Packaging materials using a polyvinylidene chloride (PVDC) coating film have also caused problems such as undesired phenomena, such as the PVDC coat layer being eroded and browning, causing delamination between layers.

[0005] Further, when the volatile component passes through the barrier layer, the adhesive outside the barrier layer may be eroded to cause the same problem.

[0006] In addition, plastic bottles of polyvinyl chloride, polyethylene and the like are usually used for containers of conventional chemicals and the like, but these have also caused environmental protection problems regarding disposal of the containers after use of the chemicals. Was.

That is, an object of the present invention is to provide a gas barrier layer which does not cause peeling of a gas barrier layer for various chemicals.
Another object of the present invention is to provide a packaging material having an appropriate gas barrier property.

Another object of the present invention is to provide a packaging material for chemicals which has less environmental protection problems than conventional ones.

[0009]

The objects of the present invention are as follows: (1) At least one surface of a polyester resin layer is made of Si
A high-density polymer is directly provided on the vapor-deposited layer surface of the gas barrier layer having a vapor-deposited layer of O _x (x is 1 to 2) via a hot-melt resin layer.
Providing an ethylene layer, and further directly on the high-density polyethylene layer.
A packaging material in which a heat-sealing resin layer is directly laminated via a heat-melting resin layer , or (2) heat sealing of the gas barrier layer according to (1) above.
Directly through a hot-melt resin on the surface opposite to the side on which the
This is achieved by providing a packaging material obtained by laminating base materials .

Hereinafter, the present invention will be described in more detail.

In the present invention, the gas barrier layer is composed of SiO _x (x is 1) on at least one surface of the polyester resin layer.
And 2) a vapor-deposited layer is formed. As the polyester constituting the polyester resin layer, polyethylene terephthalate (PET) is preferably used. Also, S
The thickness of the deposited layer of iO _x is preferably 200 to 1000 °.

[0012] Where the gas barrier layer are those having a vapor-deposited layer of SiO _x on only one side of a polyester layer, is necessary to the inner deposition layer of SiO _x when used as a packaging material is there. This is because the adhesion strength between the PET and the deposited layer of SiO _x may be reduced due to the influence of the contents.

In the packaging material of the present invention, the vapor-deposited surface of the gas barrier layer is directed to the inner surface, that is, the side in contact with the contents, and the vapor-deposited layer surface is coated with heat such as sand polyethylene (hereinafter referred to as s-PE). LLDP via molten resin layer
It is formed by laminating a heat-sealing resin layer such as E. Further, in the present invention, an HDPE layer is provided between the gas barrier layer and the heat-sealable resin layer via the same heat-melting resin layer as described above in order to impart rigidity as a packaging material .

The packaging material of the present invention can be usually prepared by laminating the above gas barrier layer inside a substrate. As a method of laminating such a base material and a gas barrier layer, a method of laminating through a method of heat lamination or dry lamination or a hot-melt resin layer is used, and when using a hot-melt resin, a co-extrusion method is used. Is preferred. PET, stretched nylon (o-Ny), or the like is preferably used as the substrate to be used.

The hot-melt resin used in the present invention includes:
When used for lamination on the inner surface of the packaging material, that is, on the contents side, adhesive polyolefins such as polyethylene and acid-modified polyolefin can be used. The same resin can be used as the hot-melt resin on the base material side.

The packaging material of the present invention can be used as a three- or four-sided seal, a standing pouch, or an inner bag of a bag-in-box by forming it into a flexible package. Moreover, if it is a laminated material containing paper, it can be used as it is as a paper container.

[0017]

[Action] on at least one surface of a polyester resin layer as in the present invention by using a gas barrier layer having a deposited layer of SiO _x, it is possible to impart higher gas barrier property.

Further, by using a hot-melt resin layer for laminating the gas barrier layer and the inner heat-sealable resin layer, peeling due to the use of the adhesive can be prevented.

Further, also in the lamination of the gas barrier layer and the outer layer such as the base material, the use of the hot-melt resin makes it possible to completely laminate these layers without an adhesive or an anchor coat. Can be completely prevented.

[0020]

EXAMPLES Example 1 One side of PET (general grade) was coated with 600 _x of SiO _x .
Inner gas barrier layer obtained by forming by a vacuum deposition method to a thickness, that is, the deposition layer surface of the SiO _x, LLDPE (typically grade) a polyethylene or acid-modified polyethylene was molten during (Showa Denko KK, ET- 184)
Are extruded in the form of a film, and both are laminated by a so-called sand lamination method.
Packaging material by laminating ET by dry lamination method
When producing the gas barrier layer and the LLDPE interlayer
High density polyethylene (HDPE)
Or sand lamination via acid-modified polyethylene
The packaging material having the following configuration 1 was prepared by laminating the layers by the method.

Further, SiO _x is applied to both sides of PET at 600
Of Å gas barrier layer obtained by forming by a vacuum deposition method to a thickness of, the deposition layer surface of the SiO _x on the side where the content contacts, LL
DPE is laminated by a sandwich method via polyethylene or acid-modified polyethylene, and o-Ny or PET as a base material is laminated on the outside by a sandwich method via acid-modified polyethylene to form a packaging material.
At the time of formation, HD between the gas barrier layer and the LLDPE layer
PE is treated with Sandra Minesi via acid-modified polyethylene.
The packaging material of the following composition 2 is created by laminating
Was.

[0022] Configuration 1 PET // PET-SiO / PE ( or acid-modified PE) / HDPE / PE (or acid-modified PE) / LLDPE (12μm) ( 20μm) (20μm) (40μm) (20μm) (80μm) Configuration 2 o-Ny (or PET) / acid-modified PE / SiO-PET-SiO / acid-modified PE (or PE) / HDPE (25μm) (20μm) (20μm) (20μm) (40μm) / acid-modified PE (or PE ) / LLDPEw (20μm) (80μm)

A standing pouch is prepared from the packaging materials having the above constitutions 1 and 2 , and a stock solution A (pH = 9.0) and a stock solution B of a color developer for iron chloride to be mixed and used.
(PH = 1.5) and stock solution C (pH = 14.0)
ml was sealed and subjected to a one-month storage test at 50 ° C. and 35% RH.

At the same time, a standing pouch is similarly prepared using the following packaging materials which have been conventionally used.
Similarly, stock solutions (A, B, C) were filled and a one-month storage test was performed. Table 1 shows the results of the storage test.

Comparative Example 1 PET // Al foil // ONy // LLDPE ^{(12 μm) (9 μm) (15 μm) (80 μm)} Comparative Example 2 PET // K-ONy // LLDPE ^{(12 μm) (15 μm) (80 μm)} Comparative Example 3 ONy // EVOH // LLDPE ^{(15 μm) (15 μm) (80 μm)}

The above // indicates that the laminate was formed by the dry lamination method, and that the urethane-based two-part curable adhesive adcoat 301A / B (manufactured by Toyo Morton) was applied at 2.5 g / m ² and laminated. K-ONy: vinylidene chloride resin-coated stretched nylon

[0027]

[Table 1]

[0028]

As described in detail above, according to the present invention, a packaging material having an appropriate gas barrier property can be obtained without causing peeling of the gas barrier layer against various chemicals, and can be completely adhered. Lamination can be performed without using an agent.

Furthermore, the packaging material of the present invention contributes to resource saving such as material saving and cost reduction, and uses less plastic than conventional materials used for chemical containers. The amount is reduced, and furthermore, chlorine-based gas is not generated at the time of incineration.

Claims (2)

(57) [Claims] 1. A deposition layer surface of the gas barrier layer comprising a deposited layer of SiO x _(x is 1-2) on at least one surface of a polyester resin layer, dense via direct hot-melt resin layer
A high-density polyethylene layer.
A packaging material formed by directly laminating a heat-sealing resin layer directly over a hot-melt resin layer . 2. The heat-sealing resin layer as a gas barrier layer.
Directly through the hot-melt resin on the side opposite to the side where the layers are laminated
The packaging material according to claim 1, wherein the base material is laminated by: