JPH05329992A - Heat-sealable matte film - Google Patents

Abstract

PURPOSE:To obtain a heat-sealable matte film having a uniform sufficiently roughened surface state, easy to permit light to transmit and having good heat sealability by laminating a mixture having a specific compsn. on at least the single surface of a polypropylene film. CONSTITUTION:A specific mixture is laminated to at least the single surface of a polypropylene film. The specific mixture is constituted of a propylene copolymer (A) with propylene content of 85-95mol.%, low density polyethylene (B) having definite characteristics, high density polyethylene (C) having definite characteristics, at least one kind of org. peroxide (D), at least one kind of a phenolic oxidation inhibitor (E) and at least one kind of a compd. (F) among an alkali metal salt of fatty acid, an alkaline earth metal salt of fatty acid and a compd. represented by general formula MxAly(OH)2X+3-2Z(A).a H2O in a definite ratio.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a heat-sealable laminated film having a biaxially oriented polypropylene film as a base material, and the laminate is uniformly roughened to easily cause diffuse reflection and is extremely transparent to transmitted light. About easy matte film.

[0002]

2. Description of the Related Art Biaxially oriented polypropylene films are used for various purposes because they are excellent in rigidity, strength and moisture resistance. On the other hand, the demand for matte films is increasing in addition to films that make the best use of the original transparency and luster of biaxially oriented polypropylene films due to the diversification of recent applications.

This matte film is used as a print laminate on a printed matter to reduce the shiny and shiny feeling of printing and to give a moist and calm color tone. In order to make the printed matter easy to see, it is required to have a light-transmitting surface and good light transmission. Further, in the use as a cover film for cards and the like, it is required to have heat sealability.

As a method for producing a matte film having heat sealability, a method of roughening the surface of the heat sealable film by a sandblast method or an emboss method is known. Further, JP-B-58-47412 discloses that a biaxially stretched film made of a crystalline polypropylene polymer is provided on at least one side thereof with 99 to 30 parts by weight of a crystalline polypropylene or a crystalline propylene-α-olefin copolymer and a high density polyethylene. Laminating a film formed by stretching at least uniaxially with a composition obtained by adding 0.001 to 1.0 parts by weight of an organic peroxide to 100 parts by weight of 1 to 70 parts by weight of medium density polyethylene or low density polyethylene in total. The method to do is proposed.

[0005]

These methods have drawbacks such as high cost due to complicated steps, uneven roughening, and insufficient mattness. The current situation is that these improvements are needed. Further, in the matte film containing polyethylene disclosed in the above Japanese Patent Publication No. 58-47412, decomposition of polyethylene that occurs in the extruder at the time of producing the film and deterioration of the polymer due to crosslinking reaction (polymer deterioration attached to die slips However, there are problems such as the deterioration of the film appearance due to cross-linked products, the occurrence of pinholes (fine holes that are formed by the pins generated in the film), and the deterioration of the film-forming property due to uneven resin flow. is there.

The object of the present invention is to solve these problems and to remarkably improve the degree of roughening of a matte film having a uniform rough surface without causing troubles during processing due to the formation of crosslinked products. To provide a heat-sealable matte film.

[0007]

Means for Solving the Problems As a result of intensive studies on the method for producing a matte film having heat sealability, the present inventors have found that a specific propylene copolymer, low density polyethylene, high density polyethylene, organic peroxide It has been found that the drawbacks of the prior art can be improved by laminating the product and a specific additive on at least one side of a polypropylene film obtained from a composition mixed in a specific mixing ratio, and arrived at the present invention. ..

The present invention has the following configuration. (1) In heat-sealing matte biaxially oriented polypropylene film, the total of (A) + (B) + (C) is 100
As a weight%, (A) a propylene copolymer having a propylene content of 85 to 95 mol% is 45 to 65% by weight (B) a melt flow rate at 190 ° C. of 1 g / 10 min or less and a density of 0.91 to 0.93 g. / cm ³ 5 to 20 wt% of low density polyethylene which is (C) a melt flow rate at 190 ° C. is 0.01 to 0.3 g / 10min, in Z- ratio of the average molecular weight and weight-average molecular weight of 7 or more, the density High density polyethylene with 0.94g / cm ³ or more 25 to 50% by weight (D) At least one organic peroxide (A) + (B)
0.001 to 0.5 parts by weight per 100 parts by weight of + (C) (E) 0.02 to 0. 0 to at least one phenolic antioxidant per 100 parts by weight of (A) + (B) + (C).
5 parts by weight (F) Alkali metal salt of fatty acid, alkaline earth metal salt,
Or the general formula _{M x Al y (OH) 2x} + 3y-2z (A) Z · aH 2 O [M is Mg, Ca or Zn, A is CO ₃ or HPO
₄ , x, y, z are positive numbers, and a is zero or a positive number], at least one compound (A) + (B) + (C)
A heat-sealing matte film, characterized in that 0.02 to 0.5 parts by weight per 100 parts by weight of the mixture is laminated on at least one side of a polypropylene film.

(2) A mixture in which 0.03 to 0.5 parts by weight of a phosphorus-based antioxidant is added to 100 parts by weight of (A) + (B) + (C) is added to the mixture of (1). The heat-sealable matte film according to (1) above. The propylene copolymer as the component (A) used in the present invention has a propylene content of 85 to 95 mol% and other α-olefins such as ethylene, butene-1,3-methylbutene, and hexene-1,
It is a copolymer with one kind or two or more kinds selected from 4-methylpentene-1, octene-1 and the like. Particularly preferred is a terpolymer containing propylene, ethylene and butene-1 having a propylene content of 90 to 95% by weight. Further, various propylene copolymers may be mixed and used as long as they have the above composition. When the propylene content of the propylene copolymer exceeds 95 mol%, it is difficult to achieve a sufficiently roughened state, and the heat sealability becomes insufficient. If the propylene content is less than 85 mol%, the adhesion with the substrate becomes insufficient and the light transmittance decreases.

The melt flow rate [MFR (230 ° C.)] of the propylene copolymer at 230 ° C. is not particularly limited, but is preferably 2 to 10 g / 10 min. The low density polyethylene which is the component (B) used in the present invention has a density of 0.91 to
It is 0.93 g / cm ³ . Low-density polyethylene is high-pressure polyethylene or ethylene and propylene, butene-1,
It can be selected from copolymers with hexene-1, vinyl acetate and the like, but high-pressure polyethylene is particularly preferable.

The melt flow rate [MFR (190 ° C.)] of the low density polyethylene at 190 ° C. is 1 g / 10 min or less, and when the MFR (190 ° C.) exceeds 1 g / min, the obtained film is roughened. Will be insufficient. The high-density polyethylene which is the component (C) used in the present invention is a polyethylene having a density of 0.94 g / cm ³ or more, and is composed of an ethylene homopolymer or ethylene and a small amount of propylene, butene-1, hexene-1, etc. It can be selected from copolymers and the like. Particularly preferred is an ethylene homopolymer having a density of 0.95 g / cm ³ or more.

The MFR (190 ° C) of high density polyethylene is 0.
The range is from 01 to 0.3g / 10min. The MFR (190 ° C) is 0.
If it exceeds 3 g / 10 min, the surface roughness of the obtained film becomes insufficient, and if it is less than 0.01 g / min, unmelted matter is likely to occur and polymer aggregates are generated on the surface of the obtained film. Further, as the high-density polyethylene as the component (C) used in the present invention, high-density polyethylene having a high molecular weight portion, specifically, high-density polyethylene having Mz / Mw of 7 or more is used. By using such a high-density polyethylene, the biaxially stretched film obtained can be roughened well.

The blending ratios of (A), (B) and (C) used in the present invention are 45 to 65% by weight and 5 to 20% by weight based on the total of (A) + (B) + (C), respectively. % By weight, 25-
It is 50% by weight. If the blending ratio of the propylene copolymer (A) is less than 45% by weight, the adhesion with the base material becomes insufficient, and the light transmittance of the obtained film is lowered to 65% by weight.
If it is larger, the surface of the obtained film will be insufficiently roughened.

The blending ratio of the low density polyethylene (B) is 5 to 20% by weight. If the amount is less than 5% by weight, the surface roughness of the obtained film becomes uneven, and if it exceeds 20% by weight, the surface roughening becomes insufficient. The blending ratio of the high-density polyethylene (C) is 25 to 50% by weight. If it is 50% by weight or more, unmelted matter is liable to be generated, polymer aggregates are generated on the obtained film surface, and the film-forming property is further deteriorated.
If it is less than 25% by weight, roughening of the obtained film will be insufficient.

In the present invention, (A) + (B) + (C)
With respect to 100 parts by weight, 0.001 to 0.
5 parts by weight, preferably 0.003 to 0.3 parts by weight are added.
If the blending amount is less than 0.001 part by weight, the effect of adding the organic peroxide, that is, the surface roughening of the obtained film cannot be achieved. If the amount is more than 0.5 parts by weight, the effect of addition becomes almost the upper limit and the film forming property deteriorates.

The organic peroxide used is {2,
5-dimethyl 2,5-bis (t-butylperoxy) hexane}, {1,3-bis (t-butylperoxyisopropyl) benzene}, benzoyl peroxide, di-t-butyl peroxide, cyclohexanone peroxide , 2,5-dimethyl 2,5-bis (t-butylperoxy) hexyne-3}, dicumyl peroxide and the like.

In the present invention, (A) + (B) +
0.02 to 0.5 parts by weight of (E) a phenolic antioxidant is added to 100 parts by weight of (C). If the amount of the phenolic antioxidant added is less than 0.02 parts by weight, the polymer is decomposed and the crosslinking reaction occurs in the extruder, causing the occurrence of eye drops and deterioration of the film appearance due to the polymer crosslinked product. If the amount added exceeds 0.5 parts by weight, the generation of shavings and crosslinked products will not change, but the roughening will decrease.

The phenolic antioxidant is 2, 6
-Di-t-butyl-p-cresol, tetrakis [methylene (3,5-di-t-butyl-4-hydroxy-hydrocinnamate)] methane, 1,3,5-trimethyl-
2,4,5-Tris (3,5-di-t-butyl-4-hydroxybenzyl) benzene, Tris (3,5-di-t)
-Butyl-4-hydroxybenzyl-isocyanurate, 4,4'-butylidene-bis- (3-methyl-6-
t-butylphenol), 1,1,3-tris (2-methyl-5-t-butyl-4-hydroxyphenol) butane, octadecyl-β- (4′-hydroxy-3 ′,
5'-di-t-butylphenol) propionate and the like can be mentioned. Meany, 2,6-di-t-butyl-p-cresol, tetrakis [methylene (3,5-di-t-butyl-4-hydroxy-hydrocinnanate)] methane for preventing the generation of crosslinked products 1, 3, 5
-Trimethyl-2,4,6-tris (3,5-di-t-
Butyl-4-hydroxybenzyl) benzene, tris (3,5-di-t-butyl-4-hydroxybenzene-
Isocyanurate is particularly preferred. You may use 2 or more types of the said phenolic antioxidant.

Furthermore, the addition of a phosphorus-based antioxidant to the mixture of the present invention is effective in preventing the formation of eye drops and crosslinked products. As the phosphorus-based antioxidant, tetrakis (2,4-
Di-t-butylphenyl) 4,4'-biphenylene diphosphonate, tris (2,4-di-t-butylphenyl) phosphite, bis (2,4-di-t-butylphenyl) -pentaerythritol Diphosphite,
Examples thereof include di (stearyl) pentaerythritol diphosphite and tris- (di-nonylphenyl) -phosphite. Tetrakis (2,4-di-t
-Butylphenyl) 4,4'-biphenylene diphosphite, tris (2,4-di-t-butylphenyl) phosphite, bis (2,4-di-t-butylphenyl) -pentaerythritol diphosphite Particularly preferred.

The amount of phosphorus antioxidant added is (A) +
It is in the range of 0.03 to 0.5 parts by weight with respect to 100 parts by weight of (B) + (C). When the addition amount is less than 0.03 parts by weight,
It is less effective in preventing the formation of crosslinked products, and when it is more than 0.5 parts by weight, there is no change in the generation of shavings and crosslinked products, but the roughening of the obtained film is reduced. Further, in the present invention, 100 parts by weight of (A) + (B) + (C) is used to prepare an alkali metal salt of a fatty acid, an alkaline earth metal salt, or a compound represented by the general formula M
_X Al _y (OH) _{2x + 3y-2z} (A) _z · aH ₂ O [M is Mg, Ca
Or Zn, A is CO ₃ or HPO ₄ , x, y and z are positive numbers, and a is zero or a positive number.] 0.02 to 0.5 parts by weight of at least one compound is added. Alkali metal salts of fatty acids, alkaline earth metal salts or addition amount of the general formula _{M X Al y (OH) 2x} + 3y-2z (A) z · aH 2 O is,
If the amount is less than 0.02 part by weight, not only the effect of preventing the generation of shavings and crosslinked products is not effective, but also the fluidity of the molten polymer in the extruder decreases. If the amount added exceeds 0.5 parts by weight, the generation of shavings and crosslinked products will not change, but the roughening will decrease.

Examples of the alkali metal salt or alkaline earth metal salt of fatty acid include calcium stearate and sodium stearate. Furthermore, in order to prevent the occurrence of die build-up of the general formula M _X Al _y (OH)
A compound represented by _{2x + 3y-2z} (A) _z · aH ₂ O is added.
Usually, Mg _4.5 Al ₂ (OH) ₁₃ CO ₃ · 3.5H ₂ O [hydrotalcite] is used.

The alkali metal salt of a fatty acid or an alkaline earth metal salt, or the general formula _{M X Al y (OH) 2x} + 3y-2z
The compound represented by (A) _z · aH ₂ O may be used in combination of two or more kinds.

Additives other than the above may be optionally added to the mixture used in the present invention. For example, an antistatic agent, a slip agent, an antiblocking agent, etc. may be added. The components (A), (B), (C) and the additives used in the present invention are preferably mixed in advance and pelletized for molding.

The polypropylene film used in the present invention is a film formed from a propylene homopolymer or a copolymer of propylene and a small amount of ethylene, butene-1, hexene-1, etc. It is free to add various additives when molding the polypropylene film. Known additives include various stabilizers, antistatic agents,
Examples thereof include slip agents and antiblocking agents.

The heat-sealable matte film of the present invention comprises a polypropylene for a polypropylene film as a base material and a mixture of (A), (B), (C) and an additive produced by separate extruders. It may be extruded at the same time into a film, and a polypropylene film may be biaxially stretched after laminating a film containing a mixture of (A), (B), (C) and an additive on one or both sides of the polypropylene film. The unstretched film used may be biaxially stretched after laminating a film containing a mixture of (A), (B), (C) and an additive on one or both sides. Further, after laminating a film using a mixture of (A), (B), (C) and an additive on one side or both sides of a uniaxially stretched film using polypropylene, this is used as a stretching direction of the uniaxially stretched film. It may be stretched in a direction at a right angle.

The stretching method may be carried out by a sequential biaxial stretching apparatus using a normal tenter method under the stretching conditions for producing a normal biaxially stretched polypropylene film. There is no limitation on the total thickness of the heat-sealing matte film obtained by the present invention, but it is usually in the range of 10 to 100 μm, preferably in the range of 15 to 50 μm. The thickness of the polypropylene film as the base material is preferably 13 to 45 μm. The layer thickness of the mixture of (A), (B), (C) and the additive is preferably 0.2 to 10 μm, particularly preferably 0.5 to 10 μm. If the laminated thickness is less than 0.2 μm, not only sufficient heat seal strength cannot be obtained, but also low temperature heat sealability cannot be imparted.

The measuring method used in the present invention is as follows. (1) Propylene content measured by ¹³ C-NMR method. FT of JEOL Ltd.
-It measured using the NMR spectrometer (GX-270) on the following conditions, and calculated from each peak area. Observation width: 12000 Hz Pulse angle: 35 ° Pulse interval: 4.5 seconds Number of integrations: 10,000 or more Measurement temperature: 130 ° C Solvent: Mixture of ortho-dichlorobenzene and deuterated bromide benzene.

(2) MFR (190 ° C.) Measured according to JIS K6760. (3) MFR (230 ° C.) Measured according to JIS K6758. (4) Density Measured according to JIS K6760.

(5) Mz / Mw Measurement was carried out using gel permeation chromatography (150 C) manufactured by Waters under the conditions shown in the following item. Column: TSK-GEL GMH-HT 7.5mm x 600m
m Measurement temperature: 135 ℃ Flow rate: 1.0 ml / min Solvent: Orthodichlorobenzene Sample concentration: 0.5 m
g / ml.

(6) Degree of roughening Haze: Measured according to ASTM-D-1003. Gloss: Measured according to ASTM-D-523 (incident angle, light receiving angle 60 °). (7) Light transmittance Measured according to ASTM-D-1003.

(8) Uniformity of roughening Surface haze was measured at 7 points at intervals of 5 cm in the direction perpendicular to the flow direction of the film, and the maximum value-the minimum value was determined. (9) Heat seal temperature Using a tester industry heat sealer, 1 Kg / cm ² ,
Heat sealing was performed under the condition of 0.8 seconds, and the value of seal strength was
The temperature was set to reach 200g / 15mm.

(10) Presence or absence of polymer aggregates The number of polymer foreign matters having a diameter of about 0.5 mm or more was visually determined. Judgment ◯: 5 pieces / 0.1 m ² or less △: 6 to 10 pieces / 0.1 m ² ×: 11 pieces / 0.1 m ² or more A hot stage is used to distinguish between polymer aggregates due to unmelted matter and polymer aggregates due to cross-linked matter. Went by.

(11) Occurrence of Meaning It was judged by the time at which the body is generated from the tip of the nozzle of the extruder. Judgment ◯: Meaning did not occur even after 5 hours or more Δ: Occurred within 2 to 5 hours ×: Occurred within 2 hours

(12) Generation of pinholes The number of pinholes generated in the film was visually determined. Judgment ◯: 5/400 cm ² or less Δ: 6 to 10 pieces / 400 cm ² ×: 11 pieces / 400 cm ² or more

(13) Film-forming property Judgment was made based on the frequency of flow unevenness occurring during film-forming. Judgment ◯: Almost no flow unevenness Δ: Occasionally flow unevenness ×: Continuous flow unevenness occurred.

[0036]

The present invention will be described in more detail by the following examples, which are not intended to limit the present invention. Example 1 A propylene homopolymer having an MFR (230 ° C.) of 1.5 g / 10 min was fed to one extruder. Next, MFR (230 ℃)
Of 5.0 g / 10 min, propylene content of 92.5 mol%, ethylene content of 5.5 mol%, butene-1 content of 2.0 mol%, and propylene copolymer (A) having an MFR (190 ° C.) of 0.15.
/ 10 min, low density polyethylene (B) with a density of 0.925 g / cm ³ , MFR (190 ° C) of 0.15 / 10 min, Mz / Mw
Is 12 and the density is 0.956 g / cm ³ , and the high density polyethylene (C) is blended at the following blending ratio, and the above (A) + (B)
+ (C) 100 parts by weight to {2,5-dimethyl 2,5
0.01 part by weight of -bis (t-butylperoxy) hexane}, tetrakis [methylene (3,5-di-t-butyl-
4-hydroxy-hydrocinnamate)] methane 0.1 part by weight, tetrakis (2,4-di-t-butylphenyl)
0.1 parts by weight of 4,4'-biphenylenediphosphonite, 0.1 parts by weight of calcium stearate and 0.1 parts by weight of hydrotalcite were added, and the mixture obtained by melt-kneading and pelletizing was fed to another extruder. .. The respective resins melted in the extruder were joined at a short tube portion and melt-extruded at 250 ° C. to form a sheet having a two-layer structure, which was wound around a cooling drum at 40 ° C. to be cooled and solidified. The thickness composition of the obtained sheet was controlled so that the layer of crystalline polypropylene was 900 μm, and the layer of the mixture of propylene copolymer, low-density polyethylene, high-density polyethylene and additives was 100 μm. Then, the obtained sheet was set on a biaxial stretching machine manufactured by Toyo Seiki Co., Ltd., heated to 158 ° C., and then stretched 5.0 times in the extrusion direction and 8.0 times in the direction perpendicular to the extrusion direction to obtain a biaxially stretched film having a thickness of 25 μm. I got a film. The characteristics of the obtained film are shown in Table 1.

Examples 2 to 3 Comparative Examples 1 to 4 Examples were carried out except that the compounding ratios of the propylene copolymer (A), the low density polyethylene (B) and the high density polyethylene (C) were changed as shown in Table 1. A biaxially stretched film was obtained according to Example 1. The characteristics of the obtained film are shown in Tables 1 and 2.

[0038]

[Table 1]

Wa: Compounding amount of propylene copolymer (A) Wb: Compounding amount of low density polyethylene (B) Wc: Compounding amount of high density polyethylene (C)

[0040]

[Table 2]

(1): Polymer agglomerates due to unmelted materials Examples 4 to 7 Comparative Examples 5 to 6 Biaxial according to Example 1 except that the propylene copolymer (A) shown in Table 3 was used. A stretched film was obtained. The characteristics of the obtained film are shown in Table 4.

[0042]

[Table 3]

[0043]

[Table 4] Examples 8 to 9 Comparative Example 7 Example 1 except that the low density polyethylene (B) shown in Table 5 was used instead of the low density polyethylene used in Example 1.
A biaxially stretched film was obtained according to. The characteristics of the obtained film are shown in Table 5.

[0044]

[Table 5]

Examples 10 to 11 Comparative Examples 8 to 10 Example 1 except that the high density polyethylene (C) shown in Table 6 was used in place of the high density polyethylene used in Example 1.
A biaxially stretched film was obtained according to. The characteristics of the obtained film are shown in Table 7.

[0046]

[Table 6]

[0047]

[Table 7]

Examples 12 to 13 Comparative Examples 11 to 14 Biaxially stretched films were obtained according to Example 1 except that the additives shown in Table 8 were used. The characteristics of the obtained film are shown in Table 9.

[0049]

[Table 8] 1: a phenolic antioxidant 2: phosphorus antioxidant 3: alkali metal salts, alkaline earth metal salts of fatty acids, or the general formula _{M X Al y (OH) 2x} + 3y-2z (A) z · aH 2, O [M
Is Mg, Ca or Zn, A is CO ₃ or HPO ₄ ,
x, y, z are positive numbers, a is zero or a positive number] a: 2,6-di-t-butyl-p-cresol b: tetrakis [methylene (3,5-di-t-butyl-
4-hydroxy-hydrocinnamate)] methane c: tetrakis (2,4-di-t-butylphenyl)
4.4'-bisphenylene diphosphonate d: tris (2,4-di-t-butylphenyl) phosphite e: calcium stearate f: hydrotalcite

[0050]

[Table 9]

Examples 14 to 15 Comparative Examples 15 to 16 A biaxially stretched film was obtained according to Example 1 except that the amount of the organic peroxide used in Example 1 was changed to the amount shown in Table 10. It was The characteristics of the obtained film are shown in Tables 10 and 11.

[0052]

[Table 10]

[0053]

[Table 11]

[0054]

The matte biaxially stretched film of the present invention can be easily produced without using complicated steps or special equipment, so that the production cost is low, and the film-forming property at the time of film processing, and No problems such as pinholes occur. Further, the obtained heat-sealing matte biaxially oriented polypropylene film has a uniform and sufficiently roughened surface state, transmitted light is very easily transmitted, and the heat-sealing property is good. It can be suitably used as a print laminate for printed matter or as a cover film for cards.

Continuation of the front page (51) Int.Cl. ⁵ Identification number Reference number within the agency FI Technical display location C08K 5/09 KEP 7242-4J 5/13 KER 7242-4J 5/14 KES 7242-4J C08L 23/14 LCD 7107 -4J C08L 23:04

Claims (2)

[Claims] 1. A heat-sealing matt biaxially stretched polypropylene film, wherein (A) propylene content is 85 to 95 mol% based on 100% by weight of (A) + (B) + (C). Copolymer 45 to 65% by weight (B) Low density polyethylene having a melt flow rate at 190 ° C of 1 g / 10 min or less and a density of 0.91 to 0.93 g / cm ³ 5 to 20% by weight (C) Melt at 190 ° C High-density polyethylene with a flow rate of 0.01 to 0.3 g / 10 min, a ratio of Z-average molecular weight to weight average molecular weight of 7 or more, and a density of 0.94 g / cm ³ or more 25 to 50% by weight (D) at least One type of organic peroxide (A) + (B)
0.001 to 0.5 parts by weight per 100 parts by weight of + (C) (E) 0.02 to 0. 0 to at least one phenolic antioxidant per 100 parts by weight of (A) + (B) + (C).
5 parts by weight (F) alkali metal salts of fatty acids, alkaline earth metal salts or the general formula _{M x Al y (OH) 2x} + 3y-2z (A) Z · aH 2 O [M is Mg, Ca or Zn, A Is CO ₃ or HPO
₄ , x, y, z are positive numbers, and a is zero or a positive number], at least one compound (A) + (B) + (C)
A heat-sealing matte film, characterized in that 0.02 to 0.5 parts by weight per 100 parts by weight of the mixture is laminated on at least one side of a polypropylene film. 2. A mixture comprising 0.03 to 0.5 parts by weight of a phosphorus-based antioxidant added to 100 parts by weight of (A) + (B) + (C), and the mixture is laminated. The heat-sealable matte film according to claim 1, wherein