JPH01247427A - Polypropylene film - Google Patents

Abstract

PURPOSE:To obtain the title polypropylene film improved in metallizability, printability, laminatability, wettability, blocking resistance, etc., by adding a specified additive to a polypropylene resin, forming the mixture into a film and subjecting this film to corona discharge treatment. CONSTITUTION:A resin composition comprising 100 pts.wt. polypropylene resin (A) (of a density of 0.89-0.91g/cm<3> and an MI of 0.1-30, preferably, 0.2-20g/10min), 0.005-0.2, preferably, 0.05-0.2 pt.wt. hydrotalcite compound (B) (preferably, one of a particle diameter <=1mum, a BET specific surface area of 3-20m<2>/g, e.g., Mg4.5Al2(OH)13-CO3.3.5H2O, a product of Kyowa Chemical), 0.01-2 pts.wt. prefer ably, 0.02-1.5 pts.wt. inorganic additive (C) (e.g., zeolite or synthetic silica), 0-0.02 pt.wt. metal salt of a fatty acid (D) (e.g., calcium stearate), and 0.0.5 pt.wt. organic additive (e.g.,'Irganox 1010(R)', a product of CIBA Geigy) is formed into a film, and this film is subjected to corona discharge treatment to obtain a polypropylene film.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention has good metal deposition properties, printability, lamination properties, etc., has surface properties that do not reduce the wettability of the film over time, and is free from blocking. The present invention relates to a polypropylene film that does not sag, has excellent slip properties, and is easy to secondary process and handle, as well as a metal-deposited polypropylene film obtained by vapor-depositing metal onto the film.

[Prior Art and Problems to be Solved by the Invention] Polypropylene films have conventionally been used as packaging materials because of their excellent transparency, mechanical strength, heat resistance, and dimensional stability.

Furthermore, printing on the surface of this polypropylene film,
Laminating other materials is being done. In particular, metal-deposited polypropylene film, which is made by vapor-depositing metal, has the same gloss as metal, has excellent commercial value, has good gas barrier properties, and has excellent light-shielding properties, so it is used as aluminum foil, etc. Instead of food packaging materials and decorative materials.

It is used in large quantities as a building material. The surface of this metallized film is usually printed or laminated with other substrates.

However, unlike PET (polyethylene terephthalate), polypropylene does not have polar groups, so it has poor metal deposition properties and adhesion with other resins.
The secondary processability such as printability is not good, and it is still not suitable for practical use.

That is, the strength of the metal vapor deposition is weak, and the wettability index (according to JIS 6768) of the metal surface after vapor deposition decreases significantly over time. The reason for this is that additives such as lubricants, hydrochloric acid scavengers, antioxidants, and antistatic agents added to polyolefins bleed out onto the surface over time, reducing the strength of the vapor deposition. It is thought that this is because the additive that bleeds out when the metal is left to stand is transferred and transferred to the metal vaporized surface, forming a thin film on the surface and lowering the wettability index.

Various methods have been proposed to solve these problems. In other words, an anchor coating treatment method in which the surface is treated with chemicals, a method of blending a modified resin such as ethylene/α-olefin copolymerization, a surface activation method using corona discharge treatment, or a method in which the total amount of additives is reduced to zero.
．． 2. Method for reducing If amount to % or less (Unexamined Japanese Patent Publication No. 167-167)
732) etc.

Anchor coating treatment methods usually involve etching the surface with chemicals such as sulfuric acid and chromate to improve adhesion, but this poses health and safety issues, requires consumption of chemicals, costs for equipment, etc. It has economic disadvantages such as inability to perform high-speed processing.

In the method of blending modified resins, if the blending amount is increased, the surface brightness deteriorates, the metal vapor deposition ability is insufficient, and the strength and rigidity also decrease.

The corona discharge treatment method is ineffective if the treatment is weak, and if the treatment is strong, additives tend to bleed out over time, and even if the metal vapor deposition power is good immediately after the treatment, the metal deposition power gradually decreases.

A method in which the total amount of additives is 0.2 fi amount % or less causes less deterioration in metal deposition power over time, but polymer decomposition occurs during molding, making it impossible to prevent film deterioration, and film formation due to poor lubricity. It has disadvantages such as being inferior in sex.

In order to solve these problems, polyolefins with a particle size of 20μ or more are used. A basic inorganic metal compound powder having a particle size of 16μ or more and a particle size of 16μ or more is 360% by weight or less.
A polyolefin composition for uniaxially oriented films containing os to 0.5% by weight has been proposed (Japanese Unexamined Patent Application Publication No. 1983-1981).
However, although the film made from this composition is effective in the case of polyethylene film, the surface activity is low in the case of polypropylene resin film, and even if metal is vapor-deposited, the vapor deposition strength is low. The wettability index is too low to be of practical use, and the wetting index has the disadvantage of a large decrease over time.

In addition, a multilayer film to which a hydrotalcite compound is added and a biaxially stretched film have been proposed in order to improve metal deposition properties (Japanese Patent Application Laid-Open No. 162845/1983).

62-238735).

However, in the case of the former, it is necessary to use a mixed resin of an ethylene-brobylene copolymer, a copolymer of propylene and an α-olefin having 4 or more carbon atoms, and a carboxylic acid graft copolymer. Since a large amount of system additives are added, it is thought that the wetting index decreases over time. Regarding the latter, this applies to stretched films, and in the case of unstretched films, it is not possible to satisfy all of the requirements of vapor deposition strength, l'il resistance, and suitability for secondary processing unless the amount of each Irfi additive is controlled. There are drawbacks.

In any case, while taking advantage of the characteristics of polypropylene resin, it has high vapor deposition strength, does not deteriorate the surface properties of the vapor deposited surface over time, and is suitable for secondary processing such as printing, vapor deposition, lamination, and bag making. could not be satisfied.

[Means for Solving the Problems] Therefore, the present inventors conducted intensive research in order to eliminate such drawbacks, and as a result, the present inventors added hydrotalcite compounds, inorganic additives, and fatty acid metals to polypropylene resin. After forming a film from a resin composition containing a specific amount of salt and organic additives,
We have discovered that it is possible to obtain a polypropylene film that has surface characteristics that do not require corona discharge treatment, has excellent metal deposition properties, printability, etc., and has good film formability and secondary processability. He has completed his invention.

In other words, the present invention is (^) polypropylene resin 100!
rIffi part, (B) hydrotalcite compound o,
oos~0.5 parts by weight, (C) inorganic additive 0.01~
2 weight 1. (D) J]1 fatty acid (D gold J71 salt 0-0
．． 02ffiffilio and (E) organic additive 0~
Provided is a polypropylene film obtained by forming a film from a resin composition containing 0.5 parts by weight and treating at least one surface with a corona discharge, and a metal obtained by vapor-depositing a metal on the corona discharge treated surface of the polypropylene film. A vapor-deposited polypropylene film is provided.

The polypropylene resin (A) used in the present invention is crystalline polypropylene, and contains 10 mol% of a propylene homopolymer or other α-olefin having 2 or more carbon atoms such as ethylene, butene-1, hexene-1, etc. Hereinafter, the copolymer preferably contains 1 to 7 mol%.

This copolymer may be a random copolymer or
Blend 2 with a homopolymer obtained by multi-stage polymerization A normal blend may be used.

In addition, the density of polypropylene resin is 0.89 to 0.9
1 g/cm', and the melt index (M) is 0.
1-30g710 minutes, preferably 0.2-20g710
It's a minute. Note that a modified polyolefin grafted with an unsaturated carboxylic acid such as maleic anhydride or a flexible conductor thereof can also be added to this polypropylene resin.

In addition, the above (^) component has a density of 0.86 to 0.91 g/c, depending on the purpose of use, etc., in order to improve the vapor deposition strength.
An ethylene-butene-1 conjugate of m' preferably 0.87 to 0.90 g/c+a' can be included in a proportion of 30% by weight or less.

This ethylene-butene-1 copolymer contains 65 to 95 mol% of ethylene, preferably 75 to 95 mol%, obtained by polymerizing ethylene and α-olefin using a polymerization catalyst consisting of a vanadium compound and an organoaluminium compound, for example.
It is a 90 mol% copolymer.

In addition, this ethylene-butene-1 copolymer has a crystallinity of 3
It has low crystallinity or poor quality, with a density of <0.8ft to 0.0% as described above. ! j1g/cm3. Here, if the density is less than 0.86 g/cm', blocking resistance and heat resistance will be poor;
If it exceeds m', the deposition strength will be poor, which is not preferable.

The use of ethylene butene-1 can improve the strength of the vapor deposition, but if used in large amounts, it reduces the brightness, so the proportion of ethylene butene-1 in the component (^) should be 30% by weight or less, preferably 201% by weight or less. use

Next, the hydrotalcite compound (B) used in the present invention is not particularly limited, and includes, for example, -maximum % formula % (wherein M is Mg or Ca, R is ^!, C" or F
e, , A is a hydrous basic carbonate represented by C03 or HPO4). The hydrotalcite compound may be any of 8 synthetic natural products such as hydrotalcite, stichtite, and pyro-olite. Specific examples of these compounds include Mg4
t2cO3・3LO.

Mg4.5Aj2(OH) +5COs・3.5H20
゜MgaAjz (OH) tacOs・4 II 2
0.

MgaAjz (OH)+aCOs・4)120゜Mg
aAji2(0)1) tocOs・5H*o.

Mg5Aj2(OH)22(COs)z・4Hzo.

Mg5Aj2(OH) 1llHPO4・4H20°C
Examples include aa^l2(OH) +aCOsiB20.

Among these, Mg4^'* (On) 12CO
3.382G.

Mg4. s＾jz(OR)+5COs・3.5HzO
, MgaAji(Oll)tacOs・4H20 is preferred because it easily becomes fine powder. The particle size of these hydrotalcite compounds is preferably 0.01 to 51 m, preferably 1 μm or less, and the BET specific surface area is 1 to 50 m27g.
, especially those with 3~20m27H have a good dispersive neutralization effect and even the appearance of the resulting film.

This is preferable in terms of uniformity.

The blending ratio of the above hydrotalcite compound is (^) polypropylene resin 100 I! For the overlapping part, o, oo
s~0°s 11m part, preferably 0.05~0
．． 2 lftff1 part. Here, if the amount of the hydrotalcite compound is less than 1 part o, oos mff, the effect of neutralizing hydrochloric acid, etc. in the resin will be poor, resulting in deterioration and corrosion of the resin or coloring of the film. On the other hand, if the amount of O or S Ii is too large, the gloss of the film will decrease and the appearance will deteriorate, which is not preferable.

Further, in the present invention, an inorganic additive is used as component (C). The inorganic additive may be either a natural product or a synthetic product. Examples of inorganic additives include zeolites such as zeolite A, zeolite Among these, zeolite, amorphous aluminosilicate 9-metal silica, and diatomaceous earth are preferred in terms of kneading, uniform dispersibility, antiblocking properties, slipperiness, and the like.

These inorganic additives are used in the form of powder, with an average particle diameter of 0.5 to 10μI, preferably 1 to 10μI.
It is 5 μm. Moreover, these inorganic additives may be surface-treated with an organic dispersion aid, if necessary.

These inorganic additives (C) are used in a proportion of 0.01 to 2 parts by weight, preferably 0.02 to 1.5 parts by weight, and 0 parts by weight per 100 parts by weight of the polypropylene resin (A).

If the blending ratio of the inorganic additive is less than 0.01 parts per part of the polypropylene resin 1001 [positioned part], the lubricity and anti-blocking effect will be poor;
Exceeding this amount is not preferable because the appearance of the film deteriorates.

Furthermore, in the present invention, a metal salt of a fatty acid is used as component (D) if necessary. Here, as metal salts of fatty acids, carbon a such as lauric acid, stearic acid, myristic acid, etc.
Metal salts, calcium salts, magnesium salts, etc. of higher fatty acids of 8 to 22 are used. Specific examples include calcium stearate, magnesium stearate, zinc stearate, calcium laurate, calcium myristate, etc., with calcium stearate being particularly preferred; metal salts of this fatty acid are used as lubricants, free hydrochloric acid scavengers, etc. However, these fatty acid metal salts, especially the fatty acids produced by the neutralization reaction with chlorine as a residual catalyst component in polypropylene resin, should not be actively used because they greatly reduce the activity of the film surface. preferred, so that even if included in the resin, its content is limited to very low values. The metal salt of this fatty acid is (A)
0 to 0.0 per 100 parts by weight of polypropylene resin
It is used in a proportion of 2 parts by weight.

Further, in the present invention, an organic additive is used as component (E) if necessary. Examples of the organic additives include antioxidants, lubricants, antistatic agents, light stabilizers, and the like.

As the antioxidant, phenolic, phosphorus, and thioether antioxidants are preferred, and these antioxidants can also be used in combination.

Other substances such as vitamin E may also be used.

Examples of phenolic antioxidants include 2,6-di-t-butyl-4-methylphenol.

Tris (3,5-di-t-butyl-4-hydroxybenzyl) isocyanurate (manufactured by Ciba Geigy, rrga
nox 3114), 2,2'-methylenebis(4
-Nity-at-t-butylphenol), n-octadecyl-3-(3',5'-di-t-butyl-4'-hydroxyphenyl)propionate (manufactured by Ciba Geigy,
Irganox 1076), 4,4'-thiobis(3-methyl-6-t-butylphenol), tetrakis[methylene-3-(3',5'-di-t-butyl-
4'-Hydroxyphenyl)propionate comethane (
Ciba Geigy, Irganox 1010),
4.4'-butylidenebis(3-methyl-6-t-butylphenol), 2.2'-methylenebis(4-methyl-6-t-butylphenol), N,N'-hexamethylenebis(3,5- di-t-butyl-4-hydroxyhydrocinnamide) (manufactured by Ciba Geigy, Irg
anox 10911), ) lyethylene glycol bis[3-(3'-t-butyl-5'-methyl-4
-hydroxyphenyl)propionate], bis(3,
A mixture of (ethyl 5-di-t-butyl-4-hydroxybenzylphosphonate) calcium and PE wax (weight ratio 1:1) (manufactured by Ciba Geigy, Irganox 14
25WL), etc.

On the other hand, examples of phosphorus-based antioxidants include distearyl pentaerythritol diphosphite (manufactured by Adeka Argus Chemical Co., Ltd., MARK PEP-8), tetrakis (
2,4-di-t-butylphenyl)-4,4'-biphenylene diphosphite (manufactured by Sandoz, 5andosta
b P-EPQ), trisnonylphenyl phosphite, tris(2,4-di-t-butylphenyl)
Phosphite (manufactured by Adeka Argus Chemical Co., Ltd., MAR 2
112), di(2,4-di-1-butylphenyl)-pentaerythritol diphosphite (manufactured by Adeka Argus Chemical Co., Ltd., RK PEP-24G).

Bis(2,6-di-t-butyl-4-methylphenyl)
Examples include pentaerythritol diphosphite (MARK PEP-36, manufactured by Adeka Argus Chemical Co., Ltd.).

Furthermore, examples of thioether antioxidants include dilauryl thiodipropionate, simiristyl thiodipropionate, distearyl thiodipropionate, pentaerythritol-tetrakis (6-lauryl-thiopropionate), and the like.

In addition, hydrocarbon lubricants such as liquid paraffin, chlorinated naphthalene, trifluorochloroethylene low polymers; fatty acid lubricants such as higher fatty acids, fatty acid amides, and alkylene bis fatty acid amides; butyl stearate, polyglycol esters, etc. Fatty acid ester lubricants such as fatty acid alcohols.

Various lubricants include alcohol-based lubricants such as polyglycol. Among them, fatty acid amides include erucic acid amide, stearic acid amide, oleic acid amide, behenic acid amide, N-stearylbutyric acid amide, N-stearylcaprylic acid amide, N-stearyllauric acid amide,
N-stearyl stearic acid amide, N-stearyl behenic acid amide, N-oleyl oleic acid amide, N-
Examples include oleylbehenic acid amide, N-butyl erucic acid amide, N-octyl erucic acid amide, and N-lauryl erucic acid amide.

Further, as the antistatic agent, any of cationic, anionic, nonionic, and amphoteric antistatic agents can be used. Specifically, primary amine salts, tertiary amines,
Cationic products such as quaternary ammonium compounds and pyridine derivatives; sulfated oils, soaps, sulfated ester oils,
Sulfated amide oil, olefin sulfate ester salts, fatty alcohol sulfate ester salts, alkyl sulfate ester salts,
Anionic products such as fatty acid ethyl sulfonate, alkylnaphthalene sulfonate, alkylbenzene sulfonate, succinate sulfonate, phosphate ester salt; partial fatty acid ester of polyhydric alcohol, ethylene oxide addition of fatty alcohol ethylene oxide adducts of fatty acids, ethylene oxide adducts of polyfatty aminos or fatty acid amides, ethylene oxide adducts of alkylphenols, ethylene oxide adducts of alkylnaphthols, ethylene oxide adducts of partial fatty acid esters of polyhydric alcohols, Examples include nonionic ones such as polyethylene glycol; and amphoteric ones such as carboxylic acid derivatives and imidacillin derivatives.

Among these, nonionic ones are preferred, and polyoxyethylene alkylamine, polyoxyethylene alkylamide, fatty acid esters thereof, and glycerin fatty acid esters are particularly preferred.

Also, as a light stabilizer, for example, satsylate type. Benzophenone type, triazole type, oxalic acid anilide type,
Hindered amine type etc. are used.

The above component (E) also tends to reduce the surface activity of the film due to bleeding, and furthermore, when a vapor-deposited film is formed, it tends to similarly reduce the surface activity due to transfer to the vapor-deposited surface, so it is preferable to use it in the minimum necessary amount.

This (E) component is (^) polypropylene resin 100
0 to 0.5 to parts by weight! 1 part, preferably 0.
It is used at a ratio of 01 to 0.3 fffffi parts. If the blending ratio of component (E) exceeds 0.5 parts, it becomes difficult to increase the deposition strength. In addition, in the case of a metal vapor-deposited polypropylene film in the present invention,
The addition ratio of bleeding additives such as lubricants is desirably 0.05 parts by weight or less per 100 parts by weight of the polypropylene resin.

The polypropylene film of the present invention has the following (^)
, (B), (C), (D), and (E) are formed into a film, and at least one surface thereof is subjected to corona discharge treatment. That is, at least one side of the polypropylene film of the present invention has been subjected to corona discharge treatment.

The film forming method may be the usual T-die cast film method, inflation method, or any of these axial or biaxial stretching methods, and the film forming conditions are 20
After melt-kneading at 0 to 300°C, a method of cooling using a roll or the like at 70°C or lower can be adopted. And in this case the thickness of the film is 5-100 μm, lO ~ [ioum
Preferably.

In addition, the conditions for the corona discharge treatment performed after film formation are usually such that the power consumption is 3 for general laminate and sealant base materials.
5W/m" for 7 minutes or more, preferably 38W/l2/min or more, in which case the wetting index after the substrate is stabilized is 36d.
yne/cm or more.

Furthermore, the present invention includes a metal-deposited polypropylene film in which a metal is deposited on the corona discharge treated surface of a polypropylene film which has been subjected to the corona discharge treatment as described above. When a polypropylene film subjected to corona discharge treatment is used as a film base material for vapor deposition in such a metallized polypropylene film, the corona discharge treatment conditions are a power consumption of 38 W/m2/min or more, preferably 40 W/m for 7 minutes. Thus, the wettability index is 38 dyne/cm or more.

The corona treatment atmosphere is air, nitrogen (oxygen concentration 5% or less), carbon dioxide gas, or the like. Also, the processing speed is lO~2
It may be done at 00 s/min.

The polypropylene film of the present invention is as described above, but it can be printed on the surface of the film embedded with corona radiation, laminated with other material films to make a laminated film, or coated with metal. It may be vapor-deposited to form a metal-deposited polypropylene film.

The method of metal vapor deposition on the surface of a polypropylene film is to place the film in a high vacuum (10-4 to 1 G-' Torr, usually 5
x 10-' Torr) and introduce the evaporated metal vapor into it to deposit it on the surface of the polypropylene film. Alternatively, the sputtering method uses glow discharge to evaporate the metal, or it can be ionized by electric discharge. It is also possible to use an ion blating method in which the substrate is etched and vapor-deposited using accelerated argon.

The metals to be vapor-deposited include aluminum, titanium, chromium, nickel, copper, silver, gold, zinc, germanium, tin,
Examples include selenium, but aluminum is preferable from the viewpoint of workability, reflectance, economy, etc. In this case, the thickness of the aluminum vapor deposited layer is usually 400 to 600.

[Example] Next, the present invention will be explained in detail with reference to examples.

Examples 1 to 7 and Comparative Examples 1 to 2 Compositions with the formulations shown in Table 1 were extruded from a T-die with a die width of 800 cm using an 85 amφ extruder at a die temperature of 250°C, and then cooled with a chill roll (40°C). , 41W on one side
/m" Corona discharge treatment (under air atmosphere) for 7 minutes to a thickness of 2
5 μl of film was obtained.

The wetting index of the corona discharge treated surface of these films, the vapor deposition strength, and the change over time in the wetting index under constant accelerated conditions were measured. Table 1 shows the results and evaluation results of laminate adhesion as secondary processing.

Comparative Example 3 A film was obtained and evaluated in the same manner as in Example 1, except that the corona discharge treatment was not performed. The results are shown in Table 1.

Comparative Example 4 A film was obtained and evaluated in the same manner as in Example 1, except that erucic acid amide was used instead of the inorganic additive and the corona discharge treatment was performed at 35 W/m2/min.

The results are shown in Table 1.

Comparative Example 5 A film was obtained and evaluated in the same manner as in Example 7 except that no hydrotalcite compound was used. The results are shown in Table 1.

Reference example Corona release 1! A film was obtained and evaluated in the same manner as in Example 1, except that the treatment was performed at 34 W/m2/min. The results are shown in Table 1.

Polypropylene resin PP-1: Idemitsu Polypro F704NO, Idemitsu Petrochemical ■
Manufactured by M17g 710 minutes, density 0.90g/cs3PP-2
: PP-1・・・・・・・・・・・・・・・・・・
・・・・・・・・・・・・・・・90[i% Ethylene-butene-1 valve type combination...1Orn amount% (density 0.88g
/cm3. Melting point: 70°C.

Butene-1 content 15211% by weight.

Mooney viscosity ML1.4 (100°C) 18) Feng 2 Hydrotalcite compound manufactured by Kyowa Chemical Industry ■D) IT-4^ [Mg4. sAj* (OH) t°5cOs・3.
5H20].

Particle size 2 μm or less $3 Inorganic additive synthetic silica Mizusawa Kagaku ■ MT silica l1300B, particle size 3 μm
4 fatty acid metal salt Calcium stearate No. 5 Organic additive (antioxidant) Tetrakis[methylene-3-(3',5'-di-t-
Butyl-4'-hydroxyphenyl) propionate comethane (manufactured by Ciba Geigy, Irganox 1010) $
6 Wet index after stabilization Compliant with JIS K-8768 *7 Vapor deposition strength Dry lamination of stretched PP film to vapor deposited film (
Adhesive is Toyo Morton polyester type, coating amount 2.5
g/m”, 60°C.

5 kg/c+a'') and the T-peel strength was measured.

I8 Sensory evaluation of bright vapor-deposited surface under fluorescent light ◎; Very good O; Good Δ; Fair Combine and roll. 40tl: After leaving for 100 hours under 90% temperature and humidity conditions, remove the vapor deposited film and remove the PET.
The surface roughness index of the vapor deposited material was measured.

◆IO Laminate Adhesiveness A sensory test was conducted on the adhesiveness of the laminate, including appearance such as wrinkles and blocking.

◎: Very good ○; Good A polypropylene film can be obtained that has excellent surface properties such as excellent adhesiveness, lamination adhesion with other materials, and printability.

Furthermore, the polypropylene film of the present invention maintains excellent surface properties (wettability) even after vapor deposition, and there is extremely little decline in wettability over time.

In addition, the polypropylene film of the present invention has excellent anti-blocking properties and slipperiness, and is excellent in film formation.
It has excellent secondary processing properties such as printing, laminating, and bag making, and is easy to handle.

Further, according to the present invention, a metal-deposited polypropylene film can be obtained which has excellent metal-deposited strength and shows extremely little decline in wettability over time even after being deposited.

Therefore, the polypropylene film of the present invention can be effectively used as various packaging materials and decorative materials, especially as a laminate base material.

Patent applicant: Idemitsu Petrochemical Co., Ltd.

Claims (6)

[Claims] (1) (A) 100 parts by weight of polypropylene resin, (B
) 0.005 to 0.5 parts by weight of hydrotalcite compounds, (C) 0.01 to 2 parts by weight of inorganic additives, (D) 0 to 0.02 parts by weight of metal salts of fatty acids, and (E) A polypropylene film formed by forming a resin composition containing 0 to 0.5 parts by weight of an organic additive and treating at least one surface with a corona discharge treatment. (2) Polypropylene resin is polypropylene 70-9
2. The polypropylene film according to claim 1, which is a resin mixture comprising 9% by weight of ethylene-butene-1 copolymer and 1-30% by weight of an ethylene-butene-1 copolymer having a density of 0.86-0.91 g/cm^3. (3) The polypropylene film according to claim 1, wherein the corona discharge treatment is performed at a power consumption of 35 W/m^2/min or more. (4) (A) 100 parts by weight of polypropylene resin, (B
) 0.005 to 0.5 parts by weight of hydrotalcite compounds, (C) 0.01 to 2 parts by weight of inorganic additives, (D) 0 to 0.02 parts by weight of metal salts of fatty acids, and (E) Organic A metal-deposited polypropylene film obtained by depositing a metal on the corona discharge-treated surface of a polypropylene film formed by forming a film of a resin composition containing 0 to 0.5 parts by weight of a system additive and treating at least one surface with corona discharge. . (5) Polypropylene resin is polypropylene 70-9
5. The metal-deposited polypropylene film according to claim 4, which is a resin mixture consisting of 9% by weight and 1 to 30% by weight of an ethylene-butene-1 copolymer having a density of 0.86 to 0.91 g/cm^3. (6) The metallized polypropylene film according to claim 4, wherein the corona discharge treatment is performed at a power consumption of 35 W/m^2/min or more.