JPH07276588A - Laminated film - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention provides flexibility, deep drawability, mechanical strength,
The present invention relates to the provision of a laminated film which has excellent tear strength, solvent resistance, hygiene, etc., has no problem of environmental pollution, and has little change in modulus with temperature change. According to the present invention, a layer (A) and a melt flow rate (MFR) obtained by mixing an amorphous polyolefin resin containing a specific component and a crystalline polyolefin resin in a specific ratio.
Is 2.0 g / 10 min. At least 3 formed by laminating the above-mentioned layer (B) containing a polyolefin resin as a main component
It is a laminated film having a layer structure. By doing this,
For example, even if it is used as a surface protection film by adhering to the surface of a metal plate or the like, it has excellent push-cut strength, scratching strength, and bevel bending workability, so that it is a surface protection laminate suitable for deep drawing, for example. It can be used as a film substrate.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated film base material for surface protection suitable for protecting the surface of a metal plate, a plastic plate or the like.

[0002]

2. Description of the Related Art Conventionally, for example, stainless steel plate, color steel plate, aluminum plate, color aluminum plate,
Polyolefin resin such as polyethylene resin, polypropylene resin, ethylene-propylene copolymer, etc. to protect the surface when various plastic plates, aluminum name plates, plastic name plates, decorative plywood, etc. are transported or processed. Soft films, sheets and the like made of resins and polyvinyl chloride resins are used as surface protective materials. Furthermore, for example, in the case of deep drawing of a stainless steel plate or the like, a peelable paint made of vinyl chloride resin is often used as a surface protective material.

[0003]

However, a surface protection film having a film made of a polyolefin resin as a base material has poor deep drawability due to poor flexibility, for example, in deep drawing. However, when the film is peeled off after the completion of deep drawing, it tends to tear and tends to be unable to be completely peeled off, which is a problem. Surface protection film based on soft vinyl chloride film has a problem of hygiene because it contains a large amount of plasticizer, etc., and also has a problem of environmental pollution due to chlorine gas etc. when burning at the time of disposal. there were. Further, the soft vinyl chloride film has a large change in modulus due to a change in temperature, which tends to cause breakage, which is a problem. Further, when using a peelable coating material made of polyvinyl chloride resin, there are problems such as hygiene and environmental pollution.

An object of the present invention is to provide a laminated film which is excellent in flexibility, deep drawability, strong tear resistance, solvent resistance and hygiene, has no environmental pollution, and has little change in modulus strength with temperature change. Especially. The present inventors have conducted extensive studies to achieve the above-mentioned object, and as a result, a mixed resin layer (A) formed by mixing a specific amorphous polyolefin resin and a crystalline polypropylene resin in a specific ratio, and a polyolefin. The inventors have found that a laminated film having at least a three-layer structure formed by co-extruding a resin layer (B) made of a system resin achieves the above object, and thus reached the present invention.

[0005]

A feature of the present invention is that an amorphous polyolefin resin 20 to 10 containing 50% by weight or more of propylene and / or butene-1 component.
0% by weight and crystalline polypropylene resin 80 to 0% by weight
And a mixed resin layer (A) made of a mixture with a melt flow rate (MFR) of 2.0 g / 10 min. The polyolefin-based resin layer (B) containing the above-mentioned polyolefin-based resin as a main component has at least a three-layer structure formed by coextruding and laminating in the order of (B) / (A) / (B),
The total thickness thereof is 20 μm or more, and the amorphous polyolefin resin containing propylene and / or butene-1 component is polypropylene, polybutene-
1, propylene / ethylene copolymer, butene-1 / ethylene copolymer, butene-1 / propylene copolymer, butene-1 / propylene / ethylene terpolymer, propylene / hexene-1 / octene-13 Terpolymer, butene-1, hexene-1, octene-1 terpolymer, propylene, hexene-1,4-methylpentene-1, terpolymer, butene-1, hexene-1,4- It is at least one selected from methyl pentene-1 terpolymers, and is further characterized in that the polyolefin resin constituting the polyolefin resin layer (B) is a homopolypropylene polymer or a propylene resin. It is at least one selected from a random copolymer and a propylene block copolymer.

The laminated film of the present invention is, for example,
When applied to the surface of a metal plate, scratch strength,
It is excellent in push-cut strength, bevel bending workability, and has a small residual strain rate when stretched (deep drawing). At this time, the scratching strength is a test method in which a predetermined weight is added using a pencil hardness tester (Fig. 3) to scratch the film surface and the state is evaluated organoleptically, and the push-cut strength is the load on the film surface. Change the jig with a tip of 0.5 mmR to 2 mm /
min. It is a numerical value obtained by a testing machine (FIG. 2) that measures the weight when the film surface is cut by lowering at the speed of. Further, the bevel bending test is a bevel bending tester (FIG. 4), which is used to bend a metal plate coated with a surface protective film having a predetermined span (width), to prevent a break or a scratch from occurring. This is a method of judging according to a judgment criterion. The means for solving the problems will be described in detail below.

As the amorphous polyolefin resin used in the layer (A) according to the present invention, the amorphous polyolefin resin having a propylene and / or butene-1 component content of 50% by weight or more, propylene and / Or butene-
Examples thereof include copolymers of 1 with other α-olefins and mixtures thereof.

Specific amorphous polyolefin resins include atactic polypropylene, which is a by-product during the production of crystalline polypropylene, and propylene and / or butene.
Examples thereof include copolymers of 1 with other α-olefins. Other α-olefins include polypropylene, polybutene-1, ethylene / propylene copolymer, butene-1 / ethylene copolymer, butene-1 / propylene copolymer, butene-1 / propylene / ethylene terpolymer , Propylene / hexene-1 / octene-1 terpolymer, butene-1 / hexene-1 / octene-1 terpolymer, propylene / hexene-1 / 4-methylpentene-1 terpolymer , Butene-1 / hexene-1 / 4-methylpentene-1 terpolymers and the like, and polymers having a propylene and / or butene-1 content of an intermediate component (50% by weight or more).

Such amorphous polyolefin resin has a boiling n-hexane insoluble content of 70% by weight or less, preferably 6%.
0% by weight or less and a number average molecular weight of 1,000 to 20
10,000, more preferably 1,500 to 100,000
0 can be exemplified. Propylene and / or butene
When the content of the one component is less than 50% by weight, the compatibility with the crystalline polypropylene resin tends to decrease, which is not preferable. On the other hand, if the boiling n-hexane insoluble content exceeds 70% by weight, the ratio of the amorphous portion is small, and it is not possible to impart sufficient flexibility to the formed film. Further, when the number average molecular weight exceeds 200,000, it is difficult to form a film, and when the number average molecular weight is less than 1,000, mechanical strength tends to decrease, which is not preferable, but in the present invention which is not particularly limited,
The above amorphous polyolefin resins may be used alone or in combination of two or more, and there is no particular limitation.

Examples of the crystalline polypropylene resin used in the layer (A) according to the present invention include isotactic polypropylene having a boiling n-hexane insoluble content of 90% or more. In this case, propylene is a homopolymer, or isotactic propylene having stereoregularity and other α
-It may be a copolymer with an olefin. As the α-olefin, an α-olefin having 2 to 8 carbon atoms, for example, ethylene, butene-1, pentene-1, hexene-1, heptene-1, octene-1 and the like are preferable. In particular, the propylene-based polymer contains 30% by weight or less, preferably 1 to 25% by weight, of an ethylene component, a propylene / ethylene random copolymer, a propylene / ethylene block copolymer and a mixture thereof, and a butene-based polymer. As propylene butene-1 containing 20% by weight or less of butene-1
Random copolymers, propylene / butene-1 block copolymers, mixtures thereof and the like are preferable, but not particularly limited.

Further, as the amorphous polyolefin resin and / or the crystalline polypropylene resin forming the layer A according to the present invention, a modified amorphous polyolefin resin,
A crystalline polypropylene resin or the like can also be used. As the modified product, the above-mentioned amorphous polyolefin resin, crystalline polypropylene resin, for example, unsaturated carboxylic acids such as maleic acid, fumaric acid, acrylic acid, itaconic acid, methacrylic acid and / or their esters, acids An anhydride, a metal salt and a derivative thereof are copolymerized, for example, graft-polymerized and modified to be suitably used. The more preferable one is not particularly limited, but one modified with maleic anhydride can be exemplified.

The layer A of the present invention comprises the above-mentioned amorphous polyolefin resin alone, or an amorphous polyolefin resin and a crystalline polypropylene resin. %, And the crystalline polypropylene resin is 80 to 0% by weight. At this time, if the amorphous polyolefin resin is less than 20% by weight (the crystalline polypropylene resin is more than 80% by weight), sufficient flexibility cannot be obtained.

The method for mixing the amorphous polyolefin resin and the crystalline polypropylene resin for forming the layer A according to the present invention is not particularly limited, but for example, a kneader, a Banbury mixer, a kneader such as a roll, Examples of the method include a method such as a mixer such as a ribbon blender and a Henschel mixer, and a method of performing heat melting and kneading using a single-screw or twin-screw extruder.

If necessary, various additives such as fillers, heat stabilizers, antioxidants, etc. may be added to the mixture constituting the layer A.
A light stabilizer, an antistatic agent, a lubricant, an antiblocking agent, a nucleating agent, a flame retardant, a pigment, a dye, calcium carbonate, barium sulfate, magnesium hydroxide, mica, talc, clay and the like can be mixed. In addition, other thermoplastic resins,
Thermoplastic elastomers, rubbers and the like can be blended, and the addition amount and blending amount thereof may be appropriately added and blended as necessary, and there is no particular limitation.

Next, the polyolefin resin layer containing the polyolefin resin as the main component for forming the B layer according to the present invention may be of the same kind as the crystalline polypropylene resin used in the A layer. Flow rate (2
30 ° C., 2.16 kg) is 2.0 g / 10 min. Or more, More preferably, it is 3.0-80g / 10min. It is preferable to use the above polyolefin resin as a main component. Melt flow rate is 2.0 g / 10 min. Is less than
For example, during coextrusion molding (particularly T-die coextrusion), the mutual melt fluidity with the A layer is poor, flow unevenness easily occurs, and an unfavorable pattern (eg, sharkskin) tends to occur on the film surface. There is not preferable. At this time, the melt flow rate is 3 from the viewpoint of thickness stability during molding.
0 g / 10 min. The following are particularly preferred.

When a solvent-based adhesive, pressure-sensitive adhesive or the like is applied to at least one surface of the polyolefin resin layer forming the layer B according to the present invention to form a pressure-sensitive adhesive laminated film for surface protection, Is required, and the polyolefin resin forming the B layer is not particularly limited, but has a melting point of 1
It is preferable to use a homopolypropylene resin having a temperature of 50 ° C. or higher. Depending on the type of solvent, a propylene random copolymer or a block copolymer having a melting point of 150 ° C. or lower may be used. A laminated film using a propylene-based random copolymer having a melting point of 150 ° C. or less is particularly excellent in flexibility.

Further, if necessary, a third component such as other thermoplastic resin, thermoplastic elastomer, rubbers, etc. may be added to the B layer according to the present invention within the range that the characteristics of the B layer are not excluded. It's all right. Particularly preferable examples of the third component include ethylene / vinyl acetate copolymers, ethylene / acrylate copolymers, and ethylene / methacrylic acid copolymers. In particular, when the laminated film substrate of the present invention is coated with an adhesive, a pressure-sensitive adhesive or the like, there is also an effect that the uniform coating property is improved, but it is not necessary to add and there is no particular limitation.

Further, various additives, fillers and the like may be blended with the polyolefin resin constituting the B layer, if desired. Specifically, heat resistance stabilizer, antioxidant, light stabilizer, antistatic agent, lubricant, antiblocking agent, nucleating agent,
Examples include flame retardants, pigments, calcium carbonate, calcium sulfate, barium sulfate, magnesium hydroxide, mica, talc and clay.

The structure of the fine layer film according to the present invention is usually preferably formed by alternately laminating the above-mentioned A layers and B layers. The number of layers A and B to be laminated is at least three layers of B / A / B, and the layers B or the low-adhesive resin are formed on the outer side of layer B, that is, both outer surface layers. If configured, it may be other than three layers.

In the present invention, the reason why the B layer or the layer made of a low-adhesive resin is provided on both outer surfaces is that the amorphous polyolefin resin used in the A layer has a strong adhesive property. With a structure such that the outer surface of the film has a strong blocking property, the laminated film formed is wound around a paper tube,
It is difficult to unwind again. Therefore, usually, a method of winding the A layer through a release paper and then laminating the B layer on the A layer by an extrusion lamination method, a dry lamination method, or the like is adopted, but this method is troublesome to operate. However, there are drawbacks such as reduced productivity. In the present invention, it is essential to form a film by using the coextrusion method so that the low-adhesive B layer serves as both outer surface layers.
By doing so, a laminated film that solves the above problems can be obtained.

The laminated film according to the present invention is B
/ A / B, or B / A / B / A / B, etc., and other thermoplastic resin, such as nylon, which does not detract from the characteristics of the laminated film in the middle of the A layer and the B layer, or outside the B layer. Saponified ethylene / vinyl acetate copolymer, polyester,
A resin layer such as polyvinylidene chloride may be provided. The following are examples of specific configurations of the present invention. For example, B / A / BB / C / A / B, C / B / A / B, B / A / B / A / B, B / C / A / B / C, C / B / A
/ B / C, B / C / A / C / B, C / B / C / A / B, C / B / C / A / C / B, C / B / C / A / B / C, C Examples include / B / C / A / C / B / C. However, A: A mixture of amorphous polyolefin resin and crystalline polypropylene resin B: Polyolefin resin C: Resin other than A and B (for example, nylon, ethylene-
Examples thereof include saponified vinyl acetate copolymers, polyesters, polyvinylidene chloride resins and the like. )

The total thickness of the laminated film according to the present invention is
It is determined by the use, but 20 μm or more is preferable. For example, when it is used for the surface protection of deep drawing of steel sheet, it is about 40μ or more, when it is used for the surface protection of automobile body molding, etc., it is about 50μ or more. Can be about 60 to 120 μ or more. Regarding the thickness constitution of each layer, the total thickness of the layer A is 20 to 99% of the total thickness of the laminated film, and more preferably 30.
~ 95% is desirable.

At this time, if the total thickness is less than 20 μ, for example, when it is used for surface protection, the function of surface protection tends to be lost. For example, in the case of deep drawing and bending etc., the strength etc. is weak and there is a tendency for tears etc. to occur, and further when peeling the laminated film from the surface protection material, it cannot be completely peeled off. Is not preferable because the laminated film may remain on the surface of the surface-protected material.

Further, the laminated film according to the present invention may be surface-treated and is not particularly limited. Surface treatment methods include corona discharge treatment, plasma treatment, flame treatment,
Examples include acid treatment and embossing. Among the above-mentioned surface treatments, corona discharge treatment is particularly preferable because it can be incorporated into the film and sheet during the production process and can be continuously treated, and operability is easy, but there is no particular limitation. By performing the surface treatment, the laminated film of the present invention has printability, laminating suitability,
The coatability and blocking resistance of pressure sensitive adhesives and adhesives are improved.

The laminated film according to the present invention is as it is,
For example, it can be used as an adhesive laminated film for surface protection, but in order to further improve the adhesiveness, an adhesive, an adhesive or the like may be applied to the surface of the film. The pressure-sensitive adhesive, the adhesive is not particularly limited, for example, natural rubber-based,
Examples thereof include acrylic type, polyisobutylene type, styrene-isobutylene-styrene copolymer, styrene-butylene-styrene copolymer, styrene-ethylene-butylene-styrene copolymer and the like.

When the laminated film of the present invention is used for a material requiring heat resistance, the layer A and / or layer B resin contains calcium carbonate, titanium oxide, etc. for the purpose of preventing deterioration of the film. A pigment made of carbon black or the like may be added to form a colored film without any particular limitation.

[0027]

The laminated film of the present invention comprises a resin layer (A) obtained by mixing an amorphous polyolefin resin containing specific components and a crystalline polypropylene resin at a specific ratio, and a resin layer containing a polyolefin resin as a main component. It has at least a three-layer structure in which (B) is coextruded and laminated. By doing so, flexibility, deep drawing workability, mechanical strength, tear strength,
It has excellent melting resistance and hygiene, no environmental pollution problems, and little change in modulus with temperature.
Further, the film is particularly excellent in scratching strength, push-cutting strength, and bevel bending workability, even when a surface of a metal plate or the like is adhered, for surface protection during processing of a metal plate or the like, transportation and the like. It can be suitably used as an adhesive laminated film base material for surface protection, which has a small residual strain rate during stretching.

The laminated film of the present invention can be preferably used as a surface protection base material for a metal plate, a plastic plate, a printed paper, a decorative plywood, or a product using them. However, it can be used for various purposes other than these. For example, food packaging, stretch film,
It can be suitably used as a stretch label, a film for packaging such as fiber packaging, a medical application, a base material for an adhesive tape, a building material film in the field of civil engineering and construction, etc., and there is no particular limitation.

The present invention will be described in more detail based on the following examples. In the following examples, each test item was measured according to the following methods. Tensile strength and elongation: Measured according to JIS-K-6872. Tear strength: Measured according to JIS-P-8116. Young's modulus: The initial elastic modulus was measured according to JIS-K-6892. Melt flow rate (MFR): JIS-K-7210
It measured according to it. Modulus: The tensile strength when the elongation reaches a predetermined value, which was measured according to JIS-K-6872.

Example 1 As a resin constituting the layer A, a propylene content of 65% by weight and a butene-1 content of 35% by weight, a density of 0.86 g / cm ³ and a melt viscosity of 10,000 cps.
50% by weight of amorphous polyolefin resin (190 ° C)
, Density 0.90 g / cm ³ , melt flow rate (M
FR) (230 ° C.) 1.0 g / 10 min. 50% by weight of the crystalline random polypropylene resin of
A pellet-shaped resin granulated by melt-kneading at 30 ° C. for 30 minutes was used. The resin constituting the B layer has a melting point of 14
2 ° C., density 0.90 g / cm ³ , melt flow rate (MFR) (230 ° C.) 9.0 g / 10 min. An ethylene-propylene random copolymer having an ethylene content of 3% by weight was used. Using the resin obtained above as the A layer and the B layer, two independent extruders were used so that the laminated film having a three-layered structure of B / A / B has the thickness shown in Table 1. The resin composing the layer B was supplied to the other, and the resin composing the layer A was supplied to the other one. Then 3 connected to 3 extruders
After being melt-extruded from the layer T die, it was cooled with an air knife and a take-up roll having a surface temperature of about 40 ° C. to obtain a laminated film. The properties of the obtained laminated film are shown in Table 1.
1 and the change in 10% modulus with temperature change is shown in FIG. The obtained laminated film was applied as a surface protection film to SUS304 (thickness 1.1 mm) and an aluminum plate (thickness 1.1 mm), and the push-cut strength, scratching strength and bevel bending test were conducted. Are shown in Tables 2, 3 and 4.

Example 2 As a polyolefin resin constituting the layer B, a melting point of 16
1 ° C., density 0.90 g / cm ³ , melt flow rate (MFR) (230 ° C.) 13.0 g / 10 min. A laminated film was obtained in the same manner as in Example 1 except that the homopolypropylene resin of Example 1 was used and the thickness constitution was changed. The properties of the obtained laminated film are shown in Table 1.

Example 3 The melting point of the polyolefin resin constituting the layer B was 16
1 ° C., density 0.90 g / cm ³ , melt flow rate (MFR) (230 ° C.) 13.0 g / 10 min. A laminated film was obtained in the same manner as in Example 1 except that the polypropylene block copolymer of Example 1 was used. The properties of the obtained laminated film are shown in Table 1.

Example 4 As a polyolefin resin constituting the layer B, a melting point of 14
2 ° C., density 0.90 g / cm ³ , melt flow rate (MFR) (230 ° C.) 9.0 g / 10 min. , An ethylene / propylene random copolymer having an ethylene content of 4% by weight as a main component, to which a vinyl acetate content of 28% by weight and a melt flow rate (190 ° C.) of 330 g / 10
min. A laminated film was obtained in the same manner as in Example 1 except that the ethylene-vinyl acetate copolymer was mixed at a mixing ratio (weight ratio) of 90/10 and the resin obtained by melt-kneading with a twin-screw extruder was used. It was The properties of the obtained laminated film are shown in Table 1.

Comparative Example 1 A polyolefin resin constituting the layer B has a melting point of 15
8 ° C., density 0.90 g / cm ³ , melt flow rate (MFR) (230 ° C.) 1.45 g / 10 min. A laminated film was obtained in the same manner as in Example 1 except that the homopropylene-based resin in Example 1 was used. The laminated film had flow patterns, streaks and the like on the surface, and the thickness stability in the width direction (transverse direction) of the film was poor. The properties of the laminated film are shown in Table 1.

Comparative Example 2 The characteristics of the adhesive film for surface protection made of a commercially available polyvinyl chloride resin and the change in 10% modulus with temperature change are shown in Table 1 and FIG. Further, the film was adhered to the surfaces of SUS304 (thickness 1.1 mm) and an aluminum plate (thickness 1.1 mm) in the same manner as in Example 1 and then subjected to push-cut strength, scratching strength and bevel bending. Natsuta. The results are shown in Tables 2, 3 and 4.

Comparative Example 3 Table 1 and FIG. 1 show the characteristics of a pressure-sensitive adhesive film for surface protection made of a commercially available polyethylene resin and the change in 10% modulus with temperature. Further, as in Example 1, after the SUS304 (thickness: 1.1 mm) and the aluminum plate (thickness: 1.1 mm) were adhered to the surfaces, push-cut strength, scratching strength, and bevel bending were performed. The results are shown in Tables 2, 3 and 4.

As is clear from Table 1, the laminated films of Examples 1, 2, 3, and 4 of the present invention are particularly excellent in breaking elongation as compared with Comparative Examples 1, 2, and 3, and thus are flexible. There is a
In addition, since it has a high tear strength, for example, when it is applied to a metal surface as a surface protection adhesive laminated film and used for deep drawing, it has excellent deep drawing workability, and when the film is peeled off after completion of deep drawing. In addition, since the film is not torn or split, the surface protection film does not remain. Further, as is clear from FIG. 1, the pressure-sensitive adhesive laminated film for surface protection of Example 1 changes in temperature more than the pressure-sensitive adhesive film for surface protection made of polyvinyl chloride resin or polyethylene resin of Comparative Examples 2 and 3. Since the change in the modulus accompanying the change is small, an undesirable phenomenon such as peeling or breakage due to a change in temperature does not occur during deep drawing, for example.

Further, as is clear from Tables 2, 3, and 4,
For example, the adhesive layered film base material for surface protection of Example 1 of the present invention coated with SUS304 or an aluminum plate is the polyvinyl chloride type of Comparative Example 2 with the surface of SUS304 or an aluminum plate coated. The surface protection film and the polyethylene-based surface protection film of Comparative Example 3 have excellent push-cut strength, scratch strength, and bevel bending workability.

[0039]

The laminated film substrate of the present invention has flexibility,
It has excellent properties such as deep drawability, mechanical strength, solvent resistance, hygiene, no environmental pollution problems, and little change in modulus due to temperature changes. In particular, it can be preferably used for surface protection of metal plates such as SUS304 and aluminum plates, plastic plates, printed paper, decorative plywood, and products using them. Furthermore, the laminated film of the present invention is used for various purposes other than the above-mentioned surface protection, for example, food packaging, stretch film, stretch label, packaging film such as fiber packaging, medical use such as infusion back film, base material of adhesive tape, It can be suitably used as a building material film in the field of civil engineering and construction, and is expected to be expanded in future applications.

[Brief description of drawings]

FIG. 1 shows a change in 10% modulus with a change in temperature.

FIG. 2 is a schematic view of a push-cut strength measuring machine.

FIG. 3 is a schematic view of a scratch strength measuring machine.

FIG. 4 is a schematic view of a bevel bending tester.

[Explanation of symbols]

 1 Adhesive film for surface protection 2 SUS304 3 Base on compression test receiving side 4 Battery 5 Light bulb 6 Upper die (punch with 0.5R tip) 7 Adhesive film for surface protection 8 SUS304 9 Cutter 10 Weight 11 Balance weight 12 Surface Adhesive film for protection 13 SUS304 14 Upper die (punch with 0.5R tip) 15 Lower die 16 Span

[Table 1]

[Table 2]

[Table 3]

[Table 4]

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Masayuki Yokoi, 163 Morikawara-cho, Moriyama-shi, Shiga Gunshi Co., Ltd. Shiga Research Institute (72) Kunio Kondo 163, Morikawa-hara, Moriyama-shi, Shiga Gunze Co., Ltd. Shiga Research In-house

Claims (4)

[Claims] 1. An amorphous polyolefin resin 2 containing 50% by weight or more of propylene and / or butene-1 component.
0-100% by weight and crystalline polypropylene resin 80-
0% by weight of the mixed resin layer (A) and a melt flow rate (MFR) of 2.0 g / 10 min. The above-mentioned polyolefin resin layer (B) containing a polyolefin resin as a main component is at least a three-layer structure formed by coextrusion and laminating in the order of (B) / (A) / (B). And a laminated film having a total thickness of 20 μm or more. 2. Amorphous polyolefin resin containing propylene and / or butene-1 component is polypropylene, polybutene-1, propylene-ethylene copolymer,
Butene-1 / ethylene copolymer, butene-1 / propylene copolymer, butene-1 / propylene / ethylene terpolymer, propylene / hexene-1 / octene-1 terpolymer, butene-1 / Hexene-1 / octene-1 terpolymer, propylene / hexene-1 / 4 methylpentene-1 terpolymer, butene-1 / hexene-1.4
The laminated film according to claim 1, wherein the laminated film is at least one selected from a methyl pentene-1 terpolymer. 3. The polyolefin resin constituting the polyolefin resin layer (B) is a homopolypropylene polymer,
The laminated film according to claim 1, which is at least one selected from a propylene-based Langum copolymer and a propylene-based block copolymer. 4. An adhesive laminated film for surface protection, which is obtained by applying an adhesive to at least one surface of the polyolefin resin layer (B) according to claim 1.