JPH08300573A - Laminated body for packaging - Google Patents

Abstract

PURPOSE: To prevent bleeding of an additive to a top face and damage to an after process aptitude due to transition from a rear face to the top face by providing a resin layer having an additive mixed therein in between a shield layer forming a laminated body and a sealant layer. CONSTITUTION: A resin layer in which an additive is mixed is provided in between a shield layer and a sealant layer. For the additive, a slip agent, an antistatic agent, and an anti-blocking agent are used. The adding rate is 10-30,000ppm and preferably 100-10,000ppm. The additive bleeds to a rear face of a laminated body by gradually passing the sealant layer from the resin layer in which the additive is mixed, but bleeding to the top face is restrained by the shield layer. For the resin in which the additive is to be mixed, for example, a polymer such as a polyethylene and a polypropylene is used, or an adhesive for dry laminate may be used. When the thickness of the resin layer in which the additive is mixed is changed, strength and duration of the effect of the additive can be also controlled optionally.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminate for packaging material in which a resin layer containing an additive is interposed.

[0002]

2. Description of the Related Art Conventionally, in a laminate used as a packaging material, additives for imparting a slip effect, an antistatic effect, etc. have been compounded in the innermost sealant layer. However, in that case, if there is time from the production of the laminate to the subsequent steps such as printing and molding, the effect of the additive will appear early, but the effect will also disappear quickly. If added in a large amount to retain the product, the sealing property will be impaired.If it is stored by winding, the additive will bleed to the front surface or transfer from the back surface side to the front surface side, making it suitable for subsequent processes such as printability. There was a defect such as damage to the.

[0003]

SUMMARY OF THE INVENTION The object of the present invention is to prevent the additive from being stored during storage and prevent the bleeding of the additive from the surface to the surface and the transfer from the back surface side to the surface side. The purpose is to develop a laminate for packaging material, which exhibits the effect of 1) at the time of the post-process.

[0004]

Means for Solving the Problems The inventors of the present invention have made extensive studies on the above object, and as a result, the present invention, that is, a resin layer containing an additive between a shielding layer and a sealant layer constituting a laminate. It has been found that this can be achieved by a laminate for packaging material, which is characterized in that

The present invention will be described in detail below.

First of all, the present invention is characterized in that a resin layer containing an additive is provided between the shielding layer and the sealant layer constituting the laminate. The shielding layer in the present invention is the addition. It is a layer having an effect of preventing bleeding of the agent to the surface side, and plastic, vapor-deposited film, metal foil or the like is used.

Here, the plastic may be a uniaxially or biaxially stretched polymer such as polyester, polyamide, polycarbonate, polyvinylidene chloride, polyvinyl alcohol or ethylene-vinyl alcohol copolymer, or may not be stretched. Alternatively, it may be layered at the time of lamination by an extrusion laminating method or the like, and its thickness is 1
Any film having a thickness of up to 200 μ may be used.

The vapor-deposited film is made of, for example, polyethylene, polypropylene, etc. in addition to the above-mentioned plastics.
Aluminum, silicon oxide, alumina, titanium oxide or the like is vapor-deposited on one side or both sides of a 6-60 μ-axially or biaxially stretched plastic film, and the vapor deposition layer has a thickness of 200 nm or less, preferably 60 n.
m or less. In the vapor deposition, the plastic film may be subjected to surface treatment such as corona discharge treatment or application of an anchor coating agent to enhance the adhesiveness of the vapor deposition layer.

Further, as the metal foil, aluminum foil,
Iron foil, tin foil, copper foil or the like can be used, and the thickness thereof is 3 to 50 μ, preferably 5 to 15 μ.

As the constituent material of the shielding layer, any one of plastic, vapor-deposited film, and metal foil may be used alone, or a combination thereof may be used.

The shielding layer is also effective for gas barrier properties, water vapor barrier properties, etc., and prevents gas, particularly oxygen gas, from entering from the outside into the packaging material and prevents moisture and flavor components inside the packaging material. It can also be used as a layer having the effect of retaining

In the present invention, the sealant layer is a layer provided on the outermost surface of the laminate and sealed when the packaging material is molded, and includes, for example, polyethylene, polypropylene, ethylene-vinyl acetate copolymer and the like. A polymer having heat sealability is used. By changing the thickness and type of the sealant layer, it is possible to arbitrarily control the timing of the effect of the additive.

In the present invention, the resin layer containing the additive must be provided between the shielding layer and the sealant layer. At that time, a slip agent, an antistatic agent, an antiblocking agent, or the like is used as an additive, and the addition rate is 1
0 to 30,000 ppm, preferably 100 to 10,000
It is ppm. The additive gradually passes from the resin layer containing the additive to the sealant layer and bleeds to the back surface of the laminate, but bleeding to the front surface side is suppressed by the shielding layer.

Polymers such as polyethylene, polypropylene, ethylene-vinyl acetate copolymers, ethylene-acrylic acid copolymers, ethylene-methacrylic acid copolymers may be used as the resin to which the additive is added, or It may be an adhesive for dry lamination or wet lamination. By changing the thickness of the additive-containing resin layer, the strength and duration of the effect of the additive can be arbitrarily controlled.

In the present invention, it is effective to further attach a base material to the outside of the shielding layer. At this time, as the base material, for example, a sheet-shaped material such as paper, synthetic paper, plastic film, metal foil or the like can be used. These substrates may have one side or both sides printed or coated with a resin.

There are various methods for laminating the shielding layer / additive-containing resin layer / sealant layer. As a method,
For example, a method of sequentially laminating a shielding layer, an additive-containing resin layer, and a sealant layer, a method of laminating an additive-containing resin layer and a sealant layer at once to a shielding layer, and a base material including a shielding layer, an additive-containing resin layer, and a sealant. Examples include a method of laminating layers at one time.

First, as a method for sequentially laminating the shielding layer, the additive-containing resin layer, and the sealant layer, when the shielding layer and the additive-containing resin layer are laminated, a dry laminating method or a wet laminating method is used. , Sticking by sandwich laminating method, etc., or resin containing additives, if necessary, anchor coating agent or corona discharge treatment,
It may be bonded by extrusion laminating method using ozone treatment, and when laminating the resin layer containing the additive and the sealant layer, the laminating method may be the same as the laminating method. it can.

Next, as a method of laminating the additive-containing resin layer and the sealant layer to the shielding layer at the same time, the additive-containing resin layer and the sealant layer, if necessary, an anchor coating agent or corona discharge treatment, It may be laminated on the shielding layer by co-extrusion laminating method using ozone treatment or the like, and the shielding layer and the sealant layer are laminated by a dry laminating method or a wet laminating method using an adhesive containing an additive. It is also possible to use a method or a method of laminating by a sandwich laminating method using a resin containing an additive.

In the case of using the above two kinds of laminating methods, when laminating the base material and the shielding layer, a laminating method such as a dry laminating method, a wet laminating method or a sandwich laminating method, or a shielding layer is used. A method of laminating on a substrate by an extrusion laminating method or the like can be used. Moreover, even if the resin layer containing the additive in the shielding layer and the sealant layer are laminated and then bonded to the substrate, the resin layer and the sealant layer containing the additive after the shielding layer is bonded to the substrate May be laminated.

Further, as a method of laminating the shielding layer, the additive-containing resin layer and the sealant layer on the substrate at once,
The shielding layer, the resin layer to which the additive is added, and the sealant layer may be directly laminated on the base material by the multi-layer co-extrusion lamination, and the multi-layer co-extrusion inflation film or cast film is dry laminated, wet laminated, or sandwiched. You may stick together by a lamination method etc.

Further, it is possible to print on the surface of the substrate opposite to the shielding layer, or to provide a plastic film layer having heat sealing property such as polyethylene.

The laminate thus obtained is printed,
After undergoing steps such as creasing, cutting, and sealing, it is molded into a packaging material and the contents are filled.

In the layered product of the present invention, it is possible to arbitrarily control the time of manifestation of the additive so that the effect of the additive is manifested at the necessary time of the subsequent steps.

[0024]

EXAMPLES The present invention will now be described in detail with reference to examples, but the present invention is not limited to these examples.

Example 1 Low-density polyethylene "Mirason 16P" (trade name, manufactured by Mitsui Petrochemical Co., Ltd.) on the back surface of cup base paper "Cop base paper N" (trade name, manufactured by Tokyo Paper Manufacturing Co., Ltd., base paper weighing 260 g / m ² ). , Aluminum foil (manufactured by Japan Foil Co., Ltd., thickness 7 μ) is sandwich-laminated with a thickness of 20 μ), and ethylene-methacrylic acid copolymer resin “Nucrel N-0908C” (trade name, Mitsui DuPont Polychemical Co., Ltd., thickness 20μ), slip agent "erucic acid amide" (addition rate 5000ppm)
Was mixed and extruded and laminated. Further, low density polyethylene "Mirason 16P" (thickness 20 µm) was extruded and laminated as a sealant layer on the "Nucrel N-0908C" surface to obtain a packaging material laminate.

Table 1 shows the results of measuring the coefficient of static friction (tan θ) between the surface and the sealant surface over time in order to evaluate the slip effect of the laminate thus obtained.

In addition, 14 days after the production of the laminate,
After the day, gravure printing was applied to the surface, and the adhesiveness of the ink was evaluated by a scotch tape pick. The evaluation results are also shown in Table 1.

The coefficient of static friction (tan θ) indicates the magnitude of friction on the measurement surface. The measuring method is J
According to ISP 8147.

In addition, in the cellotape pick test, the ink was taken in x, the slight ink was taken as Δ, and the ink not taken at all was marked as ○.

Example 2 A laminate for packaging material was obtained by laminating in the same manner as in Example 1 except that the low density polyethylene "Mirason 16P" used as the sealant layer had a thickness of 50 µm.

Regarding the laminated body obtained here, Example 1
Table 1 shows the results of measurement and evaluation performed in the same manner as in.

Example 3 A two-component curing type anchor coating agent "LX-63F" was formed on the vapor deposition surface of a silicon oxide single-side vapor deposition polyester film "TEC Barrier" (trade name, manufactured by Mitsubishi Chemical Corporation, thickness 12 µ).
And "KP-90" (trade name, manufactured by Dainippon Ink and Chemicals, Inc., solid content coating amount 1.0 g / m ² ) while applying the slip agent "erucic acid amide" (addition rate 5000
ppm) blended low density polyethylene "Mirason 16
P ”(thickness 20 μm) was used to sandwich laminate an unstretched polyethylene film“ Polyethylene AJ-8 ”(trade name, manufactured by Tama Poly Co., Ltd., thickness 40 μm) to obtain a composite film. Furthermore, a two-component curing type anchor coating agent "LX-63" was applied to the polyester surface of this composite film.
F "and" KP-90 "(solids coating amount 1.0 g / m
² ) While applying the low density polyethylene "Mirason 16
P ”(thickness 20 μm) was extruded and laminated to obtain a packaging material laminate.

Regarding the laminated body obtained here, Example 1
Table 1 shows the results of measurement and evaluation performed in the same manner as in.

Example 4 A low density polyethylene "Mirason 16P" was mixed with a slip agent "erucic acid amide" (addition rate of 5000 ppm) to prepare an inflation film having a thickness of 40 µm, and an ethylene-vinyl alcohol copolymer film "Eval" was prepared. XL "(trade name, manufactured by Kuraray Co., Ltd., thickness 12μ)
Liquid hardening type adhesives "AD-590" and "CAT-5"
5 "(trade name, manufactured by Toyo Morton Co., Ltd., dry-laminated using a solid coating amount of 3.5 g / m ² to obtain a composite film. Further, a low-density polyethylene" Mirason 16P "is provided on the polyethylene surface of the composite film. "(Thickness 15
μ) is extruded and laminated, and a two-component curing type anchor coating agent “LX-” is formed on the surface of the ethylene-vinyl alcohol copolymer.
63F "and" KP-90 "(solid amount applied 1.0g
/ M ² ), low density polyethylene “Mirason 16P” (thickness 20 μ) was extruded and laminated to obtain a packaging laminate.

Regarding the laminated body obtained here, Example 1
Table 1 shows the results of measurement and evaluation performed in the same manner as in.

Comparative Example 1 Cup base paper “Cop base paper N” (base paper basis weight 260 g /
Low density polyethylene "Mirason 16P" on the back of m ² )
Aluminum foil (manufactured by Japan Foil Co., Ltd., thickness 7 μ) is sandwich-laminated with (thickness 20 μ), and low-density polyethylene “Mirason 16P” (thickness 20 μ) is used as a sealant layer on the aluminum surface as a slip agent. "Eruca acid amide" (addition rate of 5000 ppm) was mixed and extrusion laminated to obtain a packaging laminate.

Regarding the laminated body obtained here, Example 1
Table 1 shows the results of measurement and evaluation performed in the same manner as in.

Comparative Example 2 Ethylene-methacrylic acid copolymer resin "Nucrel N-
0908C ”(thickness 20 μm) was laminated in the same manner as in Example 1 without adding an additive to obtain a laminate for packaging material.

Regarding the laminated body obtained here, Example 1
Table 1 shows the results of measurement and evaluation performed in the same manner as in. Example 5
Table 2 shows the results of measurement and evaluation performed in the same manner as in.

[0040]

[Table 1]

In Examples 1 to 4, the slip effect is exhibited at any time, and the printability is good. On the other hand, Comparative Example 1
Shows the slip effect immediately after the production and inhibits the printability. In Comparative Example 2, the printability is good, but the slip effect is not exhibited.

Example 5 An antistatic agent containing stearyl monoglyceride as a main component instead of the slip agent in Example 3 (addition rate 4000
(ppm) was used and laminated in the same manner as in Example 3 to obtain a laminate for packaging material.

Regarding the antistatic effect of the laminate obtained here, the results of measuring the surface resistivity of the sealant surface over time are shown in Table 2.

Also, 14 days after the production of the laminate,
After the day, gravure printing was applied to the surface, and the adhesiveness of the ink was evaluated by a scotch tape pick. The evaluation results are also shown in Table 2.

Example 6 Instead of the slip agent in Example 4, an antistatic agent containing stearyl monoglyceride as a main component (addition rate 4000
(ppm) was used and laminated in the same manner as in Example 4 to obtain a laminate for packaging material.

About the laminated body obtained here, Example 5
Table 2 shows the results of measurement and evaluation performed in the same manner as in.

Comparative Example 3 Instead of the slip agent in Comparative Example 1, an antistatic agent containing stearyl monoglyceride as a main component (addition rate 4000
(ppm) was used and laminated in the same manner as in Comparative Example 1 to obtain a packaging material laminate.

About the laminated body obtained here, Example 5
Table 2 shows the results of measurement and evaluation performed in the same manner as in.

[0049]

[Table 2]

In Examples 5 and 6, the antistatic effect is exhibited at any time, and the printability is also good. On the other hand, Comparative Example 3
Shows the antistatic effect immediately after the production and inhibits the printability. In Comparative Example 2, the printability is good, but the antistatic effect is not exhibited.

[0051]

EFFECTS OF THE INVENTION In addition to preventing bleeding of the additive during storage and transfer from the back surface side to the front surface side to the inhibition of suitability for the post-process during storage, the effect of the additive is exerted when the post-process is most needed. It has become possible to obtain a developing laminate for packaging material.

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Claims (3)

[Claims] 1. A laminate for packaging material, wherein a resin layer containing an additive is interposed between a shielding layer and a sealant layer constituting the laminate. 2. A laminate for packaging material, comprising a resin layer containing an additive interposed between a shielding layer and a sealant layer constituting the laminate, and a base material attached to the outside of the shielding layer. 3. The packaging laminate according to claim 1, wherein any one of plastic, vapor-deposited film, and metal foil is used alone or in combination as the shielding layer.