JPH03286852A - Metallized plastic film - Google Patents

Abstract

PURPOSE:To enhance the bonding strength of a vapor deposition film and to improve not only the printing and laminating properties of a metallized surface but also the slip properties and blocking resistance thereof by using a plastic film obtained from a composition prepared by mixing a specific ethylene/acrylic ester copolymer and a specific polyethylene resin with a polypropylene resin as a base film. CONSTITUTION:A metallized plastic film is formed by vapor-depositing a metal on a plastic film obtained from a composition mainly composed of 100 pts.wt. of a polypropylene resin, 1-20 pts.wt. of an ethylene/methyl acrylate copolymer or/and an ethylene/ethyl acrylate copolymer and 1-10 pts.wt. of a polyethylene resin having density of 0.93 or above. The vapor deposition film is usually provided only to the single surface of the plastic film but may be formed to both surfaces thereof according to use and, further, a metallized plastic film constituted by laminating this metallized plastic film to a plurality of single- layer films as the outermost layer so as to turn the vapor deposition surface thereof to the outside is also contained.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to metallized plastic films.

More specifically, although it is a metal-deposited film based on a plastic film mainly made of polypropylene resin, it has high adhesive strength between the base film and the deposited film, and has excellent printability on the deposited surface and adhesion to other films. The present invention also relates to a metal-deposited plastic film that has good slip properties and anti-blocking properties.

[Conventional technology]

In recent years, metal-deposited plastic film, which is made by depositing metal on plastic film under vacuum, has been utilized for its excellent decorative properties, gas barrier properties, light blocking properties, etc. Applications are expanding to a wide range of packaging materials, mainly for In particular, aluminum vapor-deposited plastic film is widely used mainly for packaging purposes, but in most cases, the vapor-deposited surface (aluminum surface) is printed or laminated with other films. be.

By the way, polypropylene-based films (here, polypropylene-based include not only propylene homopolymers but also copolymers of propylene as a main component with ethylene or other α-olefins) means)
is the main type of plastic film, and metal-deposited polypropylene films having a polypropylene film as a base film have traditionally been used in large quantities for the above-mentioned purposes. However, this metal-deposited polypropylene film has low adhesion strength between the base film and the deposited film, that is, the deposition strength, and when the deposited metal is aluminum, the printability of the deposited surface and the adhesion with other films (hereinafter referred to as printing and (sometimes referred to as lamination) is extremely low and cannot be used for applications that require printing or lamination.
This was a major obstacle in the development of applications.

The cause of low vapor deposition strength is the inherent inertness of polypropylene resin, and the cause of low printing/laminability on the vapor deposition surface is neutralizing agents, slip agents, and oxidation added to polypropylene resin. An example of this is that the inhibitor, etc. migrates to the surface, oozes out through the vapor deposited layer on the vapor deposited side, and is transferred to the vapor deposited surface on the opposite side when the layers are rolled up (Japanese Patent Publication No. 1983- No. 49574 and Japanese Unexamined Patent Publication No. 59-25829). To further explain the latter cause, among the additives, fatty acid derivatives are used as neutralizing agents.

In particular, higher fatty acid salts such as calcium stearate and sodium stearate, and higher fatty acid amides such as oleic acid amide, stearic acid amide, and erucic acid amide, can be used even if their content is as small as 0.01% by weight.
The wettability index of the aluminum surface (aluminum surface) is reduced to 33 dyn/cm or less, making it impossible to print or laminate the vapor-deposited surface.

Conventionally, various proposals have been made to solve these problems. For example, methods for increasing the deposition strength include methods of physically or chemically roughening the film surface, methods of oxidizing the film surface by corona discharge, gas flame, radiation irradiation, etc. to impart polar groups, or A method of coating a film surface with an adhesive material is known.

However, there are no methods for roughening or oxidizing the film surface.

In either case, the strength of vapor deposition is still insufficient when used alone, and the method of coating with an adhesive material requires pretreatment of the film surface physically or chemically before coating, which complicates the process. The drawback was that the cost of the film was high.

In addition, as a method to improve the printing and laminating properties of the vapor deposition surface as well as the vapor deposition strength, a film obtained from a mixed polymer in which polypropylene is blended with grafted polypropylene, which is obtained by graft polymerizing maleic anhydride, etc. to polypropylene, is used as a base film. It is also known (Japanese Unexamined Patent Publication No. 50-61469).

(See Special Publication No. 58-49574). However, in this case as well, the cost of the film increases as described above, and furthermore, unreacted maleic acid remaining in the film and thermal decomposition
The decomposition products have a strong odor, and when used for food packaging, the odor transfers to the contents.

In addition, the present inventors have previously proposed a polyolefin resin composition for metal-deposited films by blending a specific propylene-α-olefin copolymer with high-density polyethylene (Japanese Unexamined Patent Publication No. 59-25829). (see issue), but metal (aluminum) vapor-deposited films based on films obtained from this composition.

Although it depends on the amount of polyethylene added, there is a problem in that the film tends to tear easily and laminate bags for packaging heavy items tend to tear at the heat-sealed part.

[Problem to be solved by the invention]

The present invention eliminates the drawbacks of the above-mentioned prior art, and although it is a metal vapor deposited film based on a plastic film mainly made of polypropylene resin, it has a high adhesive strength of the vapor deposited film and is easy to print and laminate on the vapor deposition surface. Not only is it better.

The objective is to have good slip properties and anti-blocking properties.

[Means to solve the problem]

As a result of various studies, the present inventors found that by using a plastic film obtained from a composition obtained by mixing a specific ethylene-alkyl acrylate copolymer with a polypropylene resin as a base film, the adhesion strength of the vapor deposited film was high and printing was possible.・Although a product with excellent lamination properties was obtained, subsequent studies revealed that this product did not have sufficient slip and blocking resistance, and further improvements were needed to make it easier to process for various uses. It turned out that it was necessary.

Therefore, as a result of further investigation, it was determined that the above aM could be solved by using a plastic film obtained from a composition containing a specific polyethylene resin in addition to the above three as a base film, and the present invention was developed. completed.

The present invention will be explained in detail below.

The present invention comprises 100 parts by weight of a polypropylene resin and an ethylene-methyl acrylate copolymer or/and an ethylene-methyl acrylate copolymer.
1 to 20 parts by weight of ethyl acrylate copolymer and density 0.9
This metal-deposited plastic film is obtained by vapor-depositing a metal onto a plastic film obtained from a composition mainly consisting of 1 to 10 parts by weight of 3 or more polyethylene resins. The vapor deposited film is usually formed on only one side, but depending on the application, it may be formed on both sides. Furthermore, the present invention also includes a metal vapor deposited plastic film having a structure in which a plurality of single layer films are laminated with the above metal vapor deposited plastic film as the outermost layer with the metal vapor deposition surface facing outward.

The polypropylene resin used in the present invention is a crystalline propylene homopolymer, a crystalline copolymer of propylene containing propylene as a main component and ethylene or other α-olefin, or a mixture thereof. The above-mentioned homopolymers and copolymers are obtained, for example, by polymerizing the respective monomers in the presence of a Ziegler-Natsuta type catalyst. Among these, it contains 80-98% propylene component and has a crystal melting point (T+++) of 115-150.
For crystalline ethylene-propylene copolymers, crystalline propylene-butene-1 copolymers, and crystalline ethylene-propylene-butene-1 ternary copolymers in the °C range, the content ratio of ethylene:butene-1 is 10:1 to 1.:15) or a mixture thereof, a film obtained from a composition obtained by mixing these with an ethylene-alkyl acrylate copolymer and a polyethylene resin described later is
It is particularly desirable because it has excellent adhesion to the deposited film, slip property and anti-blocking property, as well as excellent impact resistance and heat sealability.

Here, the crystal melting point (mm) is the endothermic curve associated with the melting of the crystal obtained by heating a 1O2 sample at a rate of 10°C/min in a nitrogen atmosphere using a scanning differential calorimeter. The peak temperature of In the case of a crystalline copolymer containing propylene as a main component, Tm decreases as the content of ethylene or α-olefin as a comonomer component increases. For example, in the case of a crystalline ethylene propylene random copolymer, if the ethylene content exceeds approximately 2.5% by weight, the temperature will be 150° C. or lower, although it varies slightly depending on the randomness of the copolymer. In addition, by changing one polymerization condition and performing copolymerization in two or more stages of multi-stage polymerization, polymers having multiple Tm can be obtained, but in this case, the main peak is 15
A temperature below 0°C is desirable.

The ethylene-methyl acrylate co-Φ dipolymer or ethylene-ethyl acrylate copolymer used in the present invention consists of an ethylene monomer and a monomer of methyl acrylate or ethyl acrylate (sometimes collectively referred to as alkyl acrylate). It is obtained by copolymerization using a catalyst and a reaction initiator using an autoclave method. Copolymers of ethylene and other monomers such as vinyl acetate, acrylic acid, methacrylic acid, methyl methacrylate, etc. can also be obtained by a method similar to the above, but these have little effect when used in the present invention.

The content of the alkyl acrylate component in the ethylene-alkyl acrylate copolymer is usually 0.5 to 40% by weight, (preferably 3 to 30% by weight, more preferably 10 to 25% by weight). If the content of the alkyl acrylate component is less than 0.5% by weight, the effect of improving the vapor deposition strength and the printing/laminating properties of the vapor-deposited surface cannot be obtained.

As the content of the alkyl acrylate component increases to 0.5% by weight or more, the melting point of the ethylene-alkyl acrylate copolymer decreases, and by blending it with polypropylene, the above-mentioned improvement effect can be obtained, as well as resistance at low temperatures. It has improved impact resistance and can be heat-sealed at low temperatures. However, when the content of the alkyl acrylate component exceeds 40% by weight, the ethylene-alkyl acrylate copolymer no longer exhibits crystallinity, resulting in poor compatibility with polypropylene resins and the resulting film's transparency and surface. This results in loss of smoothness.

The polyethylene resin used in the present invention is an ethylene homopolymer or a copolymer with propylene, butene-1, hexene-1, etc. containing an ethylene component of 95% by weight or more, and has a density of 0.93 or more. It is something.

The melt flow rates of the polypropylene resin, the ethylene-alkyl acrylate copolymer, and the polyethylene resin are not particularly limited as long as the compatibility of the three is not impaired. From many experiments by the inventors,
Melt flow rate of polypropylene resin (MFR-
The ratio between the melt flow rate of the ethylene-alkyl acrylate polymer (symbolized as PP) and the melt flow rate of the ethylene-alkyl acrylate polymer (symbolized as MI-OR) is 0.2<MI-○R/MFR-PP<4.0 (1)
It has been found that it is particularly preferable to improve the compatibility between the two. It has also been found that when the melt flow rate ratio is within the above range, the compatibility of these three components is similarly improved even when a polyethylene resin is added to both components. When MI-○R/MFR-PP is less than 0.2, the compatibility of the three components decreases, resulting in streaks in the film, and in extreme cases, film cracking. 4.
If it is 0 or more, there will be a difference in fluidity between the polypropylene resin and the ethylene-alkyl acrylate copolymer, and therefore the composition as a whole cannot be uniformly melt extruded, resulting in uneven thickness (surging) in the horizontal fat film along the flow direction. phenomenon) occurs, and even if the obtained film is deposited, thickening and wrinkles are likely to occur.

In addition, in order to obtain a deposited film with particularly excellent metallic luster, polypropylene resin and polyethylene resin (the melt flow rate of which is designated as MI-PE) are used.

It is desirable to select and use so that 0.5≦MI-PE/MFR-PP (2).

In the composition of the present invention, the ethylene-alkyl acrylate copolymer is limited to 1 to 20 parts by weight per 100 parts by weight of the polypropylene resin.・If no improvement in lamination properties is observed, and if the amount exceeds 20 parts by weight, the film surface will become rough and a film with beautiful metallic luster will not be obtained, and a unique odor will be generated in the film, causing damage to the contents of the package. This is because it is undesirable because it may mix with odor and reduce the product value.

The reason why the amount of polyethylene resin is limited to 1 to 10 parts by weight per 100 parts by weight of polypropylene resin is that if it is less than 1 part by weight, the film's snoopability and anti-blocking properties will deteriorate, and the rollability of the vapor-deposited film will decrease. It is undesirable because it has poor appearance and tends to cause partial peeling of the deposited surface.If it exceeds 10 parts by weight, it tends to tear vertically and tear during the deposition process, and the shrinkage rate of the film increases during the deposition process, resulting in a decrease in the strength of the deposition. This is because whitening of the vapor deposition surface occurs, which is not preferable.

The composition used in the present invention optionally contains an antioxidant,
Inorganic fillers, lubricants, anti-blocking agents, etc. may be included as appropriate within a range that does not impair the purpose of the present invention, but the adhesive strength of the deposited film may vary.

In order not to deteriorate the printing/laminating properties of the vapor-deposited surface, it is desirable not to use fatty acids or derivatives containing fatty acid-forming groups.

As the antioxidant, phosphorus type and phenol type antioxidants having a molecular weight of 500 or more are particularly desirable. Specifically, tetrakis-[methylene-3-(3',5'-di-t-
Butyl-4'-hydroxyphenyl)propionate comethane.

1.3.5-trimethyl-2,4,6,-)-lis(3
, 5-di-t-butyl-4-hydroxybenzyl)benzene.

1.3.5-)-Lis(4-t-butyl-3-hydroxy-2,6-dimethylbenzyl)in cyanurate.

6-(4-human axy-3,5-di-t-butylamino)-2,4-bisn-octylthio-1,3°5-triazine.

1.1.3-)-Lis(2-methyl-4-hydroxy-
5-tert-butylphenyl)butane.

Tris(3,5-di-t-butyl-4-hydroxyphenyl)isocyanurate.

Tetrakis (2,4-di-t-butylphenyl) 4.4
'-biphenylene diphosphonite and the like can be mentioned, and these can be used alone or in combination of two or more.

The content is 0.0% per 100 parts by weight of polypropylene resin.
0.3 to 0.3 parts by weight is suitable.

The inclusion of the above-mentioned antioxidant is extremely effective in improving the stability of the composition 5 during film formation and film use.

Further, as the inorganic filler, calcium carbonate, silica, clay, talc, hydrotalcite, zeolites, etc. can be used.

The above-mentioned additives may be added to polypropylene resin, etc. by any method as long as they can be uniformly dispersed, but they may be mixed using a ribbon blender, Henschel mixer (trade name), etc., and the mixture may be mixed using an extruder, etc. A method of melting and kneading is desirable.

The polypropylene film used in the present invention can be obtained from the above composition by the usual T-die method or inflation method. Not only these -axially or biaxially stretched films, but also unstretched films can be used as the base film. Further, in the present invention, in addition to the single-layer plastic film as described above, a composite film in which a plurality of films are laminated with this plastic film as a surface layer on one or both sides can also be used as the base film.

In this case, it is a matter of course that the metal vapor deposition film is formed on the plastic film, ie, the plastic film obtained from the composition forming the surface layer. The metallized plastic film obtained in this way is
When expressed based on the single-layer metal-deposited plastic film, it has a structure in which a plurality of single-layer films are laminated as the outermost layer with the metal-deposited surface facing outward.

Hereinafter, metal vapor deposition on the base film will be explained in the case of a single layer film, but the same applies to the case of a composite film.

Although the plastic film obtained from the composition can be directly subjected to metal vapor deposition, corona discharge treatment in air or under a special gas atmosphere such as nitrogen or oxygen,
The film may be used after surface treatment such as flame treatment to improve the wettability of the film surface and further improve the adhesion. A commonly known vacuum deposition method for applying metal vapor deposition to a long plastic film (usually in the form of a roll) is as follows6.
The degree of vacuum in the vacuum evaporation equipment, which is equipped with a feeding section, a deposition section, and a winding section for a 0-roll film, is set to 10-'' Torr.
In this apparatus, a desired metal such as aluminum is heated in a container or in the form of a filament to melt and evaporate the metal, and vapor deposition molecules are continuously deposited on the surface of the unrolled film and wound up. The method of using such vacuum evaporation equipment is a batch type, and it is necessary to improve productivity. Therefore, the requirements for high-speed deposition and the shape of the roll of the original film for deposition have become more severe.

There are various deposition methods other than the vacuum deposition method described above. Examples include sputtering deposition and ion blating, which utilize the phenomenon in which metal constituting the cathode scatters when discharged in a vacuum.

The most common metal to be vapor-deposited is aluminum, but other metals such as gold, silver, copper, nickel, chromium, germanium,
Examples include selenium, titanium, tin, and zinc. The thickness of the metal deposited layer is usually in the range of 50-800 angstroms, and can be deposited not only on one side of the entire surface but also partially. Additionally, a top coat can be applied to the vapor-deposited surface for coloring and protection.

〔Example〕

EXAMPLES Hereinafter, the present invention will be explained in more detail with reference to Examples and Comparative Examples, but the present invention is not limited thereto. The measurement methods and evaluation criteria for physical properties shown in Examples and Comparative Examples are as follows.

(1) Melt flow rate: Based on JIS K 7210-1976, the melt flow rate (MFR-PP) of polypropylene resin is under test condition 14 (230°C, 2.16 kgf),
Melt flow rate of ethylene-alkyl acrylate copolymer (MI-OR) and polyethylene resin (MI-OR)
PE) under test condition 4 (190°C.

2.16 kgf).

(Unit: g/10 minutes).

(2) Adhesive strength of vapor-deposited film (vapor-deposition strength): Layer Surlyn film (ionomer manufactured by Tamabori Co., Ltd.) on the vapor-deposited film side of the vapor-deposited film, sealing temperature 120°C, sealing pressure 2.0k.
g/a#, 10aaX15 under the conditions of sealing time 1.0 seconds
Seal the garden and tensile test the 90 degree peel strength #t!
! Measured with &.

(Unit: g/15 gardens).

(3) Blocking resistance: The non-deposited surface and the deposited surface of a 2a11 (width) x 7aa (length) vapor-deposited film are overlapped over a length of 2a11 with a weight of 250 g/
After being left at 40° C. for 24 hours under a load of ci, the force required to shear and peel off at a rate of 300+ am/min using a tensile tester was measured. The smaller this force is, the better the blocking resistance is. (Unit: kg
/4a#).

(4) Slip property (sliding friction coefficient): Slip property was expressed as the number of static friction measured by the method specified in ASTM 01894-63.

(5) Wetting index: The wettability index was measured according to the method of JIS K 6758.

(Unit: dyn/cm).

(6) Printing/laminating property of vapor-deposited surface: The vapor-deposited surface (metal surface) of a film with metal (aluminum) vapor-deposited on one side and the non-vapor-deposited surface (base film surface) were overlapped and a load of 4.2 kg/100 cffl was applied. After leaving it in an atmosphere of 40° C. and 95% relative humidity for 72 hours, the wettability index of the vapor-deposited surface was measured. In order to be evaluated as having good printing/laminating properties, this wettability index must be 35 or higher,
Desirably, the wettability index is 37 or more, and based on this wettability index, the printability and lamination properties of the vapor-deposited surface were ranked as follows.

The resulting film roll was visually inspected and evaluated on a first-order basis.

0: The surface is flat, there are no wrinkles or thickening (rolling bumps), and there is no local distortion or curl when the film is pulled out (rolling appearance is good).

X: There are wrinkles and thickening, and when the film is pulled out, wrinkles remain on the film, and the film is distorted and curly (poor winding appearance).

(8) Odor: Enclose the film log in an odor bottle (500 ntQ), and
The odor generated after heating at 0° C. for 2 hours was classified into the following three grades by a sensory test.

(Panel = average value of lO name) (7) Winding form of vapor-deposited film: Example 1 obtained by continuously winding a certain length of vapor-deposited film
3. Comparative Examples 1 to 6 Ethylene component: 2.5% by weight, butene-1 component: 4.5%
% by weight of crystalline ethylene-propylene-butene-1 terpolymer with melt flow rate (MFR-PP)
is 6.0. Polypropylene resin 1 with Tm of 140°C
00 parts by weight, 0.10 parts by weight of tetrakis-[methylene-3-(3',5'-di-t-butyl-4'-hydroxyphenyl)propionate comethane as an antioxidant and a silica-based inorganic filler. 0.10 parts by weight of was added and pelletized using an extruder. For 100 parts by weight of this additive-containing pelletized polypropylene resin, various ethylene-methyl acrylate copolymers or ethylene-acrylic acid with the alkyl acrylate content and melt flow rate (MI-OR) shown in Table 1 are added. Ethyl copolymer,
Density and melt flow rate (MI-PE) shown in Table 1
) and various polyethylene resins in the parts by weight shown in Table 1 and triblended in a blender, and the resulting composition was pressed at a melting temperature of 220 ° C. using an extruder with a diameter of 65111 Iφ and a T-die. Then, it is rapidly cooled in an air chamber and a cooling roll with a surface temperature of 30°C to form a film, and immediately one side of this film has a wettability index of 40 dyn/a.
The film was wound up while being subjected to a corona discharge treatment so that the film had a thickness of 25 μm and a width of 60 aa to obtain a roll-shaped plastic film that had been treated on one side. After cutting this plastic film into a width of 50a1 using a slitter, this was set as a base film in a continuous vacuum evaporation device,
While continuously unrolling the film, aluminum was vapor-deposited on the corona-treated surface of the film under a vacuum of 5 x 10-5 orr, and then rolled up to form a single-sided aluminum film with a vapor-deposited film thickness of about 500 angstroms (within ±15 angstroms). Vapor-deposited plastic film length 2,000
It was obtained in the form of a roll of m. Each example.

Table 2 shows the properties of the metallized film obtained in the comparative example.

From Tables 1 and 2 in the margins below, films obtained from the composition specified in the present invention, that is, a composition in which a specific ethylene-alkyl acrylate copolymer and a specific polyethylene resin are blended with a polypropylene resin. The vapor-deposited films of each example based on the above are excellent in all properties, whereas the vapor-deposited films of each comparative example, even if some properties are comparable to those of the examples, other properties are significantly lower. It turns out that it is inferior.

Example 4. Comparative Example 7 A crystalline ethylene-propylene binary copolymer with an ethylene component of 4.0% by weight and a melt flow rate (MFR) of
-PP) is 7.0. Add 1.3.5 parts by weight of an antioxidant to 100 parts by weight of a polypropylene resin with a T+w of 140°C.
-Tris(4-t-butyl-3-hydroxy-2,6-
0.10 parts by weight of (dimethylbenzyl) isocyanurate and o and io parts by weight of a silica-based inorganic filler were added, and the mixture was made into pellets using an extruder. With respect to 100 parts by weight of this additive-containing pelletized polypropylene resin, the density is 0.
5 parts by weight of a polyethylene resin (containing 0.1% by weight of phenolic antioxidant) having a melt flow rate (MI-PE) of 8.0 at 950 g/cd and the ethylene-acrylic resin used in Example 1. 10 parts by weight of acid methyl copolymer (Example 4) or vinyl acetate component content of 18% by weight
10 parts by weight (Comparative Example 7) of an ethylene-vinyl acetate copolymer (containing 0.01% by weight of phosphorus antioxidant) having a melt flow rate (according to the same measurement method as MI-PE) of 2.0 was blended. Tri-blend with a blender,
The obtained composition was extruded using an extruder with a diameter of 90-φ and a T-die at a melting temperature of 230°C, and rapidly cooled with an air chamber and a cooling roll with a surface temperature of 30°C to form a film.
Immediately, one side of this film has a wetting index of 40 dyn/c.
The film was rolled up while being subjected to a corona discharge treatment so that the film had a thickness of 30 μm and a width of 2 m to form a single-sided treated plastic film in the form of a roll. This plastic film was cut to a width of 1,900 m using a slitter, and then set as a base film in a continuous vacuum evaporation device, and while the film was continuously fed out, the corona-treated surface of the film was exposed to a vacuum of 5 x 10-'Torr. The thickness of the deposited film is about 350 angstroms (within ±15 angstroms) and the length is 2.
000 m of single-sided aluminum-deposited plastic film was obtained in roll form.

The aluminum vapor-deposited film obtained in Example 4 was excellent in all properties as in Examples 1 to 3, whereas the plastic film obtained in Comparative Example 7 before vapor deposition had numerous puffy eyes. Therefore, the deposited film also had holes (pinholes) in the deposited film due to fish eyes, and could not be put to practical use.

Example 5 In Example 1, a crystalline homopolymer of propylene (M F R-P P
10. A plastic film and a roll-shaped single-sided aluminum-deposited plastic film using the slit film as a base film were obtained in the same manner as in Example 1, except that a film with a Tm of 163° C. was used.

Example 6 Composite film obtained by laminating the plastic film obtained from one composition in Example 3 (however, the thickness was changed to 20μ) and the film obtained from low-density polyethylene (thickness 15/Jl+) Example 3 except that the base film was vapor-deposited on the film side surface of the former.
Similar to a roll of single-sided aluminized plastic film? It was a temple.

The properties of Examples 4 to 6 are shown in Table 3.

From Table 3 in the margin below, it is clear that the polypropylene resin, which is the main raw material of the present invention, is not only a terpolymer mainly composed of propylene, but also
It can be seen that the effects of the present invention are exhibited even when using a binary copolymer or a homopolymer, and even when a composite film is used as the film, it has excellent properties.

〔Effect of the invention〕

The metal-deposited plastic film according to the present invention is as follows.

Although the base film is a plastic film mainly made of polypropylene resin, it contains a specific amount of ethylene-methyl acrylate or/and ethylene-ethyl acrylate and a specific polyethylene resin. As a result, it has excellent adhesive strength between the base film and vapor-deposited film, printing/laminating properties on the vapor-deposited surface, as well as slip and blocking resistance, making it widely used in packaging, decoration, and other applications. I can do it.

Claims (1)

[Scope of Claims] 1. 100 parts by weight of a polypropylene resin, 1 to 20 parts by weight of an ethylene-methyl acrylate copolymer or/and ethylene-ethyl acrylate copolymer, and 1 to 20 parts by weight of a polyethylene resin having a density of 0.93 or more. 1. A metal-deposited plastic film obtained by vapor-depositing a metal onto a plastic film obtained from a composition mainly consisting of 10 parts by weight. 2 Melt flow rate (MF) of polypropylene resin
Polypropylene resin and ethylene-acrylic resin in which the ratio of melt flow rate (MI-OR) of ethylene-alkyl acrylate copolymer (R-PP) to ethylene-alkyl acrylate copolymer is 0.2<MI-OR/MFR-PP<4.0. The metal-deposited plastic film according to claim 1, wherein an acid alkyl copolymer is used. 3 Melt flow rate of polypropylene resin (MF
A claim in which a polypropylene resin and a polyethylene resin are used in which the ratio of the melt flow rate (MI-PE) of R-PP) to the polyethylene resin is 0.5≦MI-PE/MFR-PP. 3. The metallized plastic film according to 1 or 2. 4. A metal-deposited plastic film comprising a plurality of single-layer films laminated with the metal-deposited plastic film according to any one of claims 1 to 3 as the outermost layer with the metal-deposited plastic film facing outward.