JPH0720655B2 - Method for producing aluminum vapor-deposited laminated film - Google Patents

Description

The present invention relates to a method for producing an aluminum vapor-deposited laminated film by extrusion laminating an ethylene-based copolymer resin onto an aluminum vapor-deposited propylene-based resin film,
In particular, the invention provides an aluminum vapor-deposited laminated film useful as various packaging materials and the like.

(B) Conventional technology Conventionally, aluminum-deposited propylene-based resin film obtained by vapor-depositing aluminum on a stretched or unstretched film of propylene-based resin has excellent mechanical properties, chemical properties, transparency, and propylene-based resin film. In addition to water vapor barrier property, aluminum has gas barrier property, light blocking property,
It is widely used as various packaging materials, etc., because it imparts aesthetics and the like. At that time, the aluminum vapor-deposited propylene-based resin film is usually formed by extrusion-laminating the ethylene-based copolymer resin on the aluminum-deposited film or by extruding the ethylene-based copolymer resin with another base material. An aluminum vapor deposition laminated film is obtained by laminating or the like.

However, such a conventional aluminum vapor-deposited laminated film is either between a propylene-based resin film as an evaporated film and an aluminum vapor-deposited film, or between an aluminum vapor-deposited film and an ethylene-based copolymer resin extrusion laminate layer. The adhesive strength was low, and as a result, the adhesive strength between the aluminum vapor-deposited propylene-based resin film and the ethylene-based copolymer resin extruded laminated layer was inferior.

(C) Problems to be Solved by the Invention The present invention has been made in view of the above-mentioned current situation in the conventional aluminum vapor deposition laminated film, and comprises an aluminum vapor deposition propylene resin film and an ethylene copolymer resin extrusion laminate layer. It is an object of the present invention to provide a method for producing an aluminum vapor-deposited laminated film having excellent adhesive strength.

(D) Means for Solving Problems The method for producing an aluminum vapor-deposited laminated film of the present invention comprises
More specifically, on the aluminum vapor deposition film of propylene resin film having an aluminum vapor deposition film having a thickness of 100 to 500Å, ethylene copolymer resin is extruded from an extruder die at a resin temperature of 180 to 210 ° C. and pressure-bonded. Thickness of 7
It is characterized by forming an extruded laminated layer having a thickness of 25 μm.

Here, the propylene-based resin film, the melt flow rate of about 0.5 ~ 10 g / min, a homopolymer of propylene, a copolymer of propylene and ethylene, α-olefin such as butene-1, and these A propylene-based resin such as a mixture is formed into a film, or the film is uniaxially or biaxially stretched and has a thickness of about 5 to 150 μm.

The propylene-based resin film, on the surface thereof, after subjected to a pretreatment such as corona discharge treatment, anchor coating treatment, etc., if necessary, aluminum is deposited by a known vapor deposition method such as a vacuum vapor deposition method, a sputtering method, or an ion beam method. Although it has an aluminum vapor deposition film formed by vapor deposition, in the present invention, the thickness of the aluminum vapor deposition film is 100 to 500.
Å is essential, and preferably 200 to 400 Å. If the thickness of the deposited film is less than 100Å, the intended gas barrier properties, aesthetics, etc. are not provided, making it unsuitable as a packaging material.If it exceeds 500Å, the propylene resin film and the deposited film as the film to be deposited are The adhesive strength between the vapor-deposited film and the extruded laminated layer is poor.

Further, the ethylene-based copolymer resin, ethylene, 10 ~
50% by weight, preferably 30 to 50% by weight of a vinyl ester such as vinyl acetate, or a copolymer with a (meth) acrylic acid ester such as methyl acrylate, ethyl acrylate, methyl methacrylate, ethyl methacrylate, or , Ethylene and 1 to 15% by weight, preferably 3 to 10% by weight, of a copolymer of acrylic acid and methacrylic acid with (meth) acrylic acid, and all or part of the acid moiety of these copolymers is 1 to It means an ionic copolymer neutralized with trivalent metal ions and has a melt flow rate of about 10 to 500 g / 10 minutes.

In the present invention, on the aluminum vapor-deposited film of the propylene-based resin, an extrusion laminated layer is formed by extruding the ethylene-based copolymer resin from an extruder die and press-bonding the extrusion resin at a temperature of 180 to A temperature of 210 ° C is essential. If the resin temperature is less than 180 ° C, the adhesive strength between the aluminum vapor deposition film and the extruded laminated layer will be low, while if it exceeds 210 ° C, the adhesive strength between the vapor deposited film and the extruded laminated layer will be good, but as a film to be vapor-deposited. The adhesive strength between the propylene-based resin film and the vapor-deposited film is reduced, and as a result, the adhesive strength between the vapor-deposited film and the extrusion laminate layer is deteriorated.

Further, in the present invention, it is essential that the thickness of the extruded laminate layer is 7 to 25 µ, and preferably 10 to 20 µ. When the thickness of the extruded laminated layer is less than 7 μ, it is the same as when the resin temperature is less than 180 ° C., and when it exceeds 25 μ, it is the same as when the resin temperature is more than 210 ° C. As a result, the adhesive strength between the vapor deposition film and the extruded laminated layer becomes poor.

The extrusion laminating speed is preferably about 50 to 200 m / min.

(E) Action and Effect The method for producing an aluminum vapor-deposited laminated film of the present invention is
Since the ethylene copolymer resin is extrusion-laminated at a low temperature on the aluminum vapor-deposited film of the propylene-based resin film having the aluminum vapor-deposited film having a specific thickness, and the thickness of the extrusion laminated layer is specified, Good adhesion strength between vapor-deposited film and vapor-deposited film, and between vapor-deposited film and extruded laminate layer. As a result, excellent adhesion strength between aluminum vapor-deposited propylene resin film and ethylene-based copolymer resin extruded laminate layer. It is also possible to produce an aluminum vapor-deposited laminated film.

(F) Example Example 1 A biaxially stretched polypropylene film (thickness 20 μm) having an aluminum vapor-deposited film having a thickness of 100 liters was unwound from an unwinder, and an ethylene-acrylic acid copolymer resin (melt flow rate 50 g / 10 min. , Acrylic acid content 3% by weight)
An aluminum vapor-deposited two-layer laminated film was manufactured by extruding from a T-die mounted on a 90 mm extruder at a resin temperature of 180 ° C. and press-bonding onto the aluminum vapor-deposited film to form an extruded laminated layer having a thickness of 20 μm. The extrusion laminating speed was 100 m / min.

With respect to the obtained laminated film, the adhesive strength and appearance of the aluminum vapor-deposited biaxially oriented polypropylene film and the ethylene-acrylic acid copolymer resin extruded laminate layer were evaluated, and the results are shown in Table 1.

Example 2, Comparative Example 1 A laminated film was produced in the same manner as in Example 1 except that the thickness of the vapor deposited aluminum film was 300 Å (Example 2) and 600 Å (Comparative Example 1), and the evaluation results are shown in Table 1. It was shown to.

Example 3 An aluminum vapor-deposited film having a thickness of 300Å was prepared by using an ethylene-vinyl acetate copolymer resin (melt flow rate 150 g / 10 minutes, vinyl acetate content 44% by weight) instead of the ethylene-acrylic acid copolymer resin. Otherwise, a laminated film was produced in the same manner as in Example 1, and the evaluation results are shown in Table 1.

Comparative Example 2 A laminated film was produced in the same manner as in Example 3 except that the resin temperature was 240 ° C., and the evaluation results are shown in Table 1.

Example 4 A polypropylene film (thickness 25 μm) having a 100 Å-thick aluminum vapor-deposited film was used as one base material, and a biaxially oriented polypropylene film (thickness 20 μm) was used as the other base material, and both base materials were wound from an unwinder. At the same time, the latter substrate surface is subjected to corona discharge treatment and anchor coat treatment, and then an ethylene-acrylic acid copolymer (melt flow rate 55 g / 10 minutes, acrylic acid content 8% by weight) is extruded with a bore diameter of 90 mm. A T-die mounted on the machine was extruded between both substrates at a resin temperature of 200 ° C. and pressure-bonded to form a 15 μm thick Saint-Gerci extrusion laminate layer on the aluminum vapor-deposited film to produce an aluminum vapor-deposited three-layer laminated film. . The extrusion laminating speed was 80 m / min.

With respect to the obtained laminated film, the adhesive strength between the aluminum vapor-deposited polypropylene film and the ethylene-acrylic acid copolymer resin extruded laminated layer and the appearance were evaluated, and the results are shown in Table 2.

Examples 5 to 7 and Comparative Examples 3 and 4 A laminated film was produced in the same manner as in Example 4 except that the thickness of the aluminum vapor deposition film was changed as shown in Table 2, and the evaluation results are shown in Table 2.

Examples 8 to 10 and Comparative Examples 5 and 6 The thickness of the vapor-deposited aluminum film was 340Å, and the ethylene-acrylic acid copolymer resin (melt flow rate 150 g / 10
Min., Acrylic acid content 6% by weight) and the resin temperature was changed as shown in Table 2, a laminated film was produced in the same manner as in Example 4, and the evaluation results are shown in Table 2.

Examples 11 to 15 and Comparative Examples 7 and 8 A laminated film was produced and evaluated in the same manner as in Example 4 except that the thickness of the aluminum vapor deposition film was 330 Å and the thickness of the extrusion laminate layer was changed as shown in Table 2. The results are shown in Table 2.

Example 16 An aluminum vapor-deposited film having a thickness of 310Å was prepared by using ethylene-vinyl acetate copolymer resin (melt flow rate 50 g / 10 minutes, vinyl acetate content 30% by weight) instead of ethylene-acrylic acid copolymer resin. Otherwise, a laminated film was produced in the same manner as in Example 4, and the evaluation results are shown in Table 3.

Examples 17, 18 and Comparative Example 9 The resin temperature was 180 ° C. (Example 17) and 240 ° C. (Comparative Example 9), and the thickness of the extrusion laminate layer was 10 μ (Example 18).
A laminated film was produced in the same manner as in Example 16 except that the above was used, and the evaluation results are shown in Table 3.

Example 19 The thickness of the vapor-deposited aluminum film was 310Å, and ethylene-methacrylic acid copolymer resin (melt flow rate 30 g / 10 minutes, methacrylic acid content 10% by weight) was used instead of the ethylene-acrylic acid copolymer resin. Otherwise, a laminated film was produced in the same manner as in Example 4, and the evaluation results are shown in Table 3.

Example 20 The thickness of the vapor-deposited aluminum film was 310 Å, and the ethylene-acrylic acid copolymer resin was replaced with an ethylene-ethyl methacrylate copolymer resin (melt flow rate 45 g / 10 minutes, ethyl methacrylate content 35% by weight). A laminated film was produced in the same manner as in Example 4 except that the above was used, and the evaluation results are shown in Table 3.

The adhesive strength is 15 mm in width and 90 mm in length in parallel with the laminating direction of the laminated film, a test piece is cut off, 50 mm is pre-peeled between the aluminum vapor deposition film and the extruded laminated layer, and the remaining 40 mm is peeled at a speed of 300 mm / min. It is represented by the maximum strength when the T-peel is peeled off.

The appearance was evaluated according to the following criteria.

◎: Good metallic luster ○: With metallic luster ×: No metallic luster

Claims (1)

[Claims] 1. An ethylene-based copolymer resin is extruded from an extruder die at a resin temperature of 180 to 210 ° C. and pressure-bonded onto the aluminum-deposited propylene resin film having an aluminum-deposited film having a thickness of 100 to 500 Å. Depending on the thickness 7-25
A method for producing an aluminum vapor-deposited laminated film, which comprises forming an extruded laminated layer of μ.