JP2003237827A - Packaging film, and packaging body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a packaging film of excellent anti-fog property, slipping property, blocking resistance, and transparency. <P>SOLUTION: This packaging film is formed of at least two laminates having a biaxially-oriented base layer mainly consisting of polypropylene resin, and a heat seal layer which is formed on at least one side and mainly consisting of polyolefin resin. The surface of the heat seal layer has anti-fog property, and the heat seal layer contains organic polymer particles of the grain size of 0.1 to 7.0 μm and inert particles of the grain size of 0.1 to 7.0 μm by the amount per 100 pts.wt. of the resin to form the heat seal layer which satisfies the inequalities of 0.10≤C<SB>1</SB>/C<SB>2</SB>≤5.00 (1) and 0.15≤C<SB>1</SB>+C<SB>2</SB>≤1.00, where C<SB>1</SB>is the amount (pts.wt.) of organic polymer particles of the grain size of 0.1 to 7.0 μm, and C<SB>2</SB>is the amount (pts.wt.) of inert particles of the grain size of 0.1 to 7.0 μm. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packaging film and a packaging body, and in particular, it has antifogging property and slipperiness.
Vegetables, root vegetables, with improved blocking resistance and transparency,
A film suitable for packaging a perishable product (hereinafter, referred to as a perishable product in the present specification) made of a plant or an animal such as a fruit, a flower, a flower tree, a mushroom, a fish, or a meat requiring a high degree of freshness, and TECHNICAL FIELD The present invention relates to a packaging body, that is, a packaging film having an antifogging property and having improved slipperiness, blocking resistance and transparency, and a packaging body.

[0002]

2. Description of the Related Art Conventionally, a method for improving the slipperiness and blocking resistance of a polyolefin film used for various packaging materials has been known.
No. 2-16134 and Japanese Patent Laid-Open No. 3-9938 disclose a polyolefin film in which inorganic fine particles such as zeolite powder and spherical silica are added to polyolefin.

[0003]

The above-mentioned conventional polyolefin film has improved slipperiness and blocking resistance of the film, but has a problem of poor transparency and scratch resistance of the film. Further, a method is known in which inorganic fine particles and organic polymer fine particles are added together to a polyolefin. By this method, when a polyolefin film for general use is manufactured, slipperiness and blocking resistance are improved, and a film having sufficient winding property can be obtained. However, when an antifogging film is manufactured, the antifogging agent is present on the surface of the film, so that there is a problem that the blocking resistance is not sufficiently exhibited.

The present invention provides a wrapping film and a wrapping product, particularly a wrapping film and wrapping having excellent antifogging property, and excellent slipperiness, blocking resistance and transparency in the packaging of fresh products. Intended to provide the body.

[0005]

In order to achieve the above object, the packaging film of the present invention comprises a biaxially stretched base layer mainly composed of polypropylene resin and a polyolefin resin formed on at least one surface thereof. A packaging film comprising a laminate of two or more layers having a heat seal layer as a main component, wherein the heat seal layer surface has antifogging property, and the heat seal layer has an average particle size of 0.1. ~ 7.
0 μm organic polymer fine particles and average particle size of 0.1 to 7.
It is characterized by containing 0 μm of inert fine particles in an amount satisfying the following formulas (1) and (2) per 100 parts by weight of the resin forming the heat seal layer. 0.10 ≦ C ₁ / C ₂ ≦ 5.00 (1) 0.15 ≦ C ₁ + C ₂ ≦ 1.00 (2) C _l : Organic polymer fine particles having an average particle size of 0.1 to 7.0 μm Amount (parts by weight) C ₂ : Amount (parts by weight) of inactive fine particles having an average particle diameter of 0.1 to 7.0 μm Here, the inactive fine particles mean fine particles other than the organic polymer fine particles.

The packaging film of the present invention having the above-mentioned constitution has not only excellent antifogging property but also excellent sliding property,
It can have blocking resistance and transparency.

In this case, the organic polymer fine particles are fine particles made of an organic polymer formed from one or more monomer components selected from acrylic acid type monomers, methacrylic acid type monomers and styrene type monomers. be able to.

In this case, the inert fine particles can be inorganic fine particles.

Further, in this case, the packaging film may be a film in which an antifogging agent is present in at least the base layer and the heat seal layer.

Further, in this case, at least the base layer and the heat seal layer of the packaging film may be biaxially stretched.

Further, in this case, the packaging film may be one used for packaging fresh products.

Further, in this case, the packaging film can be used for an automatic packaging machine.

Furthermore, the package of the present invention is characterized in that it is formed by using the above-mentioned packaging film.

The packaging film and package of the present invention having the above-mentioned constitution can have excellent antifogging property, and also excellent sliding property, blocking resistance and transparency.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the packaging film and the packaging body of the present invention will be described below.

The packaging film of the present invention comprises two layers having a polypropylene resin as a main component and a biaxially stretched base layer, and a polyolefin resin as a main heat seal layer formed on at least one surface of the base layer. It is formed from the above laminated body.

Such a packaging film is preferably produced by a coextrusion method or an in-line laminating method, but the production method itself does not limit the film and the package of the present invention. Further, the base layer of the packaging film constituting the present invention needs to be biaxially stretched, but the heat seal layer formed on at least one surface is unstretched, uniaxially stretched, or biaxially stretched. It may be.

Here, polypropylene resins suitable for forming the base layer of the packaging film in the present invention include isotactic polypropylene, propylene / ethylene copolymer, propylene / butene-1 copolymer, One or more of propylene / ethylene / butene-1 copolymer and propylene / pentene copolymer are used. In addition, other polyolefin resins such as ethylene / butene-1 copolymer, ethylene / propylene / butene-1 copolymer, ethylene / acrylic acid copolymer, and ethylene / acrylic acid copolymer can be prepared by metal ion. The crosslinked ionomer, polybutene-1, butene / ethylene copolymer and the like may be mixed and used.
A polyester resin, a polyamide resin, a polycarbonate resin, or the like can be mixed and used as long as the characteristics of the film are not impaired. Further, an ultraviolet absorber, an antioxidant, an antistatic agent or the like can be optionally mixed.

The polyolefin resin suitable for forming the heat-sealing layer of the packaging film according to the present invention comprises a polyolefin resin having a melting point lower than that of the polypropylene resin forming the base layer. Ethylene / butene-1 copolymer, ethylene / propylene / butene-1 copolymer, ethylene / acrylic acid copolymer, ionomer obtained by crosslinking ethylene / acrylic acid copolymer with metal ion, polypropylene, polybutene-1, butene -Using one or more of ethylene copolymers, propylene-ethylene copolymers, propylene-butene-1 copolymers, propylene-ethylene-butene-1 copolymers, propylene-pentene copolymers, and the like, Furthermore, polyester resin, polyamide resin,
It is also possible to mix and use a polycarbonate resin or the like within a range that does not impair the characteristics of the film. Further, an ultraviolet absorber, an antioxidant, an antistatic agent and the like can be optionally mixed.

In the heat-sealing layer of the packaging film of the present invention, organic polymer fine particles having an average particle diameter of 0.1 to 7.0 μm and inert fine particles having an average particle diameter of 0.1 to 7.0 μm are heat-sealed. With 100 parts by weight of the resin forming the layer being _Cl parts by weight and the latter being C ₂ parts by weight, the formula (1) and the formula (2) 0.10 ≦ C ₁ / C ₂ ≦ 5.00 (1) 15 ≦ C ₁ + C ₂ ≦ 1.00 (2) It is necessary that the content be contained.

If the value of the formula (1) is less than 0.10, the anti-fogging property of the film is not sufficient, and if it exceeds 5.00, the fusing seal strength becomes low, and the value of the formula (2) is 0. If it is less than 15, the slipperiness and blocking resistance of the film are poor,
If it exceeds 1.00, the transparency becomes low.

Further, it is preferable that the above-mentioned organic polymer fine particles and the above-mentioned inert fine particles are C ₁ parts by weight and the latter C ₂ per 100 parts by weight of the resin forming the heat-sealing layer.
By including as an amount by weight, the formula (3) and the formula (4) 0.50 ≦ C ₁ / C ₂ ≦ 3.00 (3) 0.20 ≦ C ₁ + C ₂ ≦ 0.50 (4) is there.

The organic polymer fine particles used in the present invention are not particularly limited as long as they are fine particles made of an organic polymer which does not melt at the melt molding temperature of the polyolefin resin and has heat resistance. The polymer forming the fine particles can be obtained by any method such as an addition polymerization method, a polycondensation method or a polyaddition reaction method. Further, the organic polymer forming the fine particles may be either a non-crosslinked type or a crosslinked type, but is preferably a crosslinked type organic polymer fine particles from the viewpoint of heat resistance.

In the present invention, the organic polymer fine particles are preferably a polymer formed from a monomer component containing an acrylic monomer, a methacrylic monomer and / or a styrene monomer.

Such polymers include homopolymers of acrylic monomers, methacrylic monomers or styrene monomers, acrylic monomers, copolymers containing methacrylic monomers or styrene monomers, acrylic monomers, methacrylic monomers. Examples thereof include copolymers of monomers and styrenic monomers. In particular, it is preferable to use a cross-linking type acrylic-methacrylic-styrene copolymer from the viewpoint of improving the balance among transparency, slipperiness and heat resistance. The polymer composition of the organic polymer fine particles may be the same or different.

Examples of the above acrylic monomers and methacrylic monomers include acrylic acid, methyl acrylate, ethyl acrylate, butyl acrylate and other acrylic acids or ester derivatives thereof, or methacrylic acid, methyl methacrylate and methacrylic acid. Examples thereof include methacrylic acid such as ethyl and butyl methacrylate, or ester derivatives thereof. In particular, it is preferable to use acrylic acid ester and methacrylic acid ester. One or more of these monomers can be used. Furthermore, if a small amount, a metal salt of acrylic acid or methacrylic acid,
An amide derivative, an ester derivative having a structure such as hydroxylethyl ester or dimethylaminoethyl ester, or the like can be used.

Examples of the styrene-based monomer include styrene such as styrene, methylstyrene and α-methylstyrene, or a derivative thereof. In particular, it is preferable to use a styrene monomer. Further, a polymerizable vinyl monomer such as vinyl acetate, vinyl chloride, vinylidene chloride, acrylonitrile, or methacrylonitrile may be copolymerized as long as it is 20% by weight or less of the total monomer components.

The cross-linking method of such a polymer is carried out by mixing a polyfunctional monomer such as divinylbenzene, ethylene glycol diacrylate ester or dimethacrylate ester at the time of preparation of the organic polymer fine particles, and copolymerizing them. Examples of the means include post-crosslinking afterwards, but the invention is not particularly limited thereto.

A method of atomizing the above polymer is also
There is no particular limitation. However, from the viewpoint of economy, it is preferable to use a method of directly forming fine particles during polymerization by an emulsion polymerization method or a suspension polymerization method. When these polymerization methods are adopted, it is also possible to use means for copolymerizing a small amount of a polar monomer having a special structure capable of imparting self-emulsifying property.

The shape of such organic polymer fine particles is not particularly limited, either, but a substantially spherical shape or a rugby ball shape is preferable.

The inert fine particles used in the present invention have an average particle size of 0.1 to 7.0 μm, preferably 0.2 to 5.0 μm, and are not particularly limited as long as they are other than the above organic polymer fine particles. From the viewpoint of balancing the transparency, slipperiness, blocking resistance, and economical efficiency of the film, inorganic fine particles are preferable. Examples of such inorganic fine particles include oxides such as silica, alumina and titanium white, complex oxides such as kaolin, zeolite and talc, carbonates such as calcium carbonate, calcium sulfate,
Examples thereof include sulfates such as barium sulfate and phosphates such as calcium phosphate. These inert fine particles may be either natural products or synthetic products. The shape of the inert fine particles used in the present invention may be amorphous, spherical, angular, columnar,
Any shape such as a needle shape or a plate shape can be used.

The average particle diameters of the organic polymer fine particles and the inert fine particles used in the present invention are both 0.1 to 7.0.
It is required to be in the range of μm, preferably 0.2 to 5.0 μm. When the average particle size of the organic polymer fine particles and the inert fine particles is less than 0.1 μm, the slipperiness and blocking resistance of the film decrease. On the other hand, even if the average particle diameter exceeds 7.0 μm, the slipperiness and blocking resistance of the film are not further improved, but rather the transparency of the film is lowered. Further, the organic polymer fine particles and the inert fine particles used in the present invention preferably have a sharp particle size distribution in order to obtain both satisfactory film transparency, slipperiness and blocking resistance.

Further, it is preferable that the organic polymer fine particles and the inert fine particles used in the present invention contain two or more kinds of fine particles having different particle diameters in a specific ratio. In such fine particles having different particle diameters, fine particle (a) having a small particle diameter
Is mainly used for the purpose of improving the slipperiness and blocking resistance of the film, and the fine particles (b) having a large particle diameter are mixed for the purpose of improving the winding property of the film.

The small particle (a) and the large particle (b) can be arbitrarily selected from organic polymer particles and inert particles. In particular, it is preferable to select fine particles (a) having a smaller particle size than fine particles of an organic polymer and fine particles (b) having a large particle size, and to use inert fine particles as the fine particles (a) having a small particle size. Of course, the fine particles (a) and the fine particles (b) may each be a mixture of organic polymer fine particles and inert fine particles.

The average particle size of such small particle (a) is 0.1 to 5.0 μm, and the average particle size of large particle (b) is 1.5 to 7. It is 0.0 μm.

The packaging film of the present invention requires the surface of the heat-sealing layer to have antifogging properties, and therefore,
An antifogging agent is usually present in the resin forming the base layer and the heat seal layer. During film production, an antifogging agent may be added to both the resin forming the base layer and the resin forming the heat seal layer, or the film may be formed by adding the antifogging agent only to the resin forming the base layer. It may be manufactured.
Even in the latter case, the antifogging agent in the resin forming the base layer during film production and storage after film formation is sequentially transferred to the heat seal layer, and then bleeds out to the heat seal layer surface to form the heat seal layer. The surface has an antifogging property. On the surface of the heat-sealing layer on the side of the packaging film which is in contact with the fresh product, an antifogging agent which exhibits antifogging property during storage or distribution of the fresh product must be present. That is, in the present invention, the antifogging action is extremely effective not only for preventing the fogging phenomenon on the inner surface of the package to enhance the commercial value but also for preventing the water content of the package contents from being spoiled by the water droplets formed by the progress of the fogging. In order to maintain the excellent antifogging property for a long period of time during the distribution process, which is an important characteristic, the temperature change is repeated between 5 and 30 ° C in consideration of the temperature change during storage or distribution. It is desired that an antifogging agent that continuously exhibits antifogging properties is present on the surface of the heat seal layer.

The wrapping film of the present invention is intended for wrapping perishable products characterized by sustaining physiological action after harvesting, and is desired to be stored at room temperature rather than frozen. In setting the anti-fogging property in the present invention, it is preferable to determine the anti-fogging property when the temperature change is repeated between 5 and 30 ° C.

Examples of the antifogging agent used for imparting antifogging property to the surface of the heat-sealing layer include fatty acid esters of polyhydric alcohols, amines of higher fatty acids, amides of higher fatty acids, amines of higher fatty acids. Typical examples thereof include ethylene oxide adduct of amide and the like. The amount of the antifogging agent present in the film is preferably 0.1 to 10% by weight, particularly preferably 0.2 to 5% by weight in terms of the total layer, and 5.0% by weight in the heat seal layer forming component.
Below, it is particularly preferable that the content is 0.1 to 1.0% by weight.
Further, an ultraviolet absorber, an antioxidant, an antistatic agent and the like can be optionally mixed.

The thickness ratio of the heat-sealing layer is not particularly limited, but is usually 1/50 to 1/3 with respect to all the layers in the packaging film of the present invention (when heat-sealing layers are provided on both sides of the base layer). Is the total thickness). If the thickness ratio is smaller, the heat seal strength will be insufficient and the reliability as a package will be impaired. Further, if the thickness ratio is larger, the proportion of the base layer portion is smaller, so that the entire packaging film becomes less stiff, and the shape of the package after filling with fresh products is unstable, resulting in lack of commercial value. The total thickness of the packaging film is not particularly limited, but is 5
It is about 250 μm, and the thickness of the heat seal layer can be appropriately determined within this range.

The method of measuring the characteristic values used in the present specification will be described below.

(1) Sliding property According to JIS-K-7125, the dynamic friction coefficient (μd) between the surfaces of the heat-sealing layers of the film was measured under the environment of 23 ° C. and 65% RH.

(2) Blocking resistance (N / 20 mm) The film is cut into 80 mm × 120 mm with a cutter, and two pieces of the cut pieces are vertically shifted by 20 mm and are stacked to obtain a sample. Five sets of this sample are alternately stacked with type paper, sandwiched between glass plates, and a load of 2 kg is applied, and the sample is left to stand in an environment of 50 ° C. for 48 hours. The sample was taken out, allowed to cool, and re-cut in the longitudinal direction with a width of 20 mm to give a test piece. The test piece was measured for shear stress at a pulling speed of 200 mm / min using a tensile tester.

(3) Transparency Haze (%) was measured according to JIS-K-7105.

(4) Average particle diameter (μm) A photograph was taken with a scanning electron microscope, the Feret diameter in the horizontal direction was measured using an image analyzer, and the average value was taken as the average particle diameter.

(5) Fusing seal strength (N / 15 mm) Using a side welder (PP-500 type) manufactured by Kyoei Printing Machinery Co., Ltd., a blade edge set temperature of 390 ° C. and a blade edge angle of 90
Degree, bag making speed 90 bags / min, bag size 200 mm x 300 mm
The heat-sealed part of the bag manufactured under the conditions of No. 1 was sampled into a width of 15 mm to make a test piece,
The breaking strength in mm / min was measured.

(6) Wetting tension It was measured according to the JIS-K-6768 method.

(7) Antifogging property The antifogging property was measured in the following order. 300m of 50 ° C warm water in a 500mL upper opening
Insert L. The container opening is sealed with the film so that the antifogging measurement surface of the film is on the inside. Leave in a cold room at 5 ° C. Leave it in a cold room at 5 ℃ for 12 hours, then move it to an environment at 30 ℃
Leave for 12 hours. After repeating the above operation for 2 days, the dew adhesion state on the film measurement surface is evaluated in 6 levels. Evaluation 6th grade: No dew on the entire surface (zero adhesion area) Evaluation 5th grade: Some dew adhesion (up to 1/5 adhesion area) Evaluation 4th grade: Some dew adhesion (up to 1/4 adhesion area) Evaluation 3rd grade: About 1 / 2 dew adhesion (adhesion area up to 2/4) Evaluation 2nd: Almost dew adhesion (adhesion area up to 3/4) Evaluation 1st grade: Full surface dew adhesion (adhesion area 3/4 or more)

[0048]

EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited to the following examples.

Example 1 (1) Preparation of Resin for Forming Heat Seal Layer 100 parts by weight of propylene / ethylene / butene copolymer (ethylene content 2.5 mol%, butene content 7 mol%), inert 0.265 parts by weight of fine particles (Sylysia 420, manufactured by Fuji Silysia Chemical Ltd., particle diameter 1.9 μm), and 0.450 parts by weight of antifogging agent (higher fatty acid ester monoglycerite) were adjusted to a resin temperature of 240 ° C. Melt mixed and pelletized.

100 parts by weight of propylene / butene copolymer (butene content 18 mol%), fine particles of organic polymer (CS18, manufactured by Sumitomo Chemical Co., Ltd., particle diameter 1.8 μm)
0.300 parts by weight, organic polymer fine particles (CS30, manufactured by Sumitomo Chemical Co., Ltd., particle diameter 3.5 μm) 0.200 parts by weight, antifogging agent (higher fatty acid ester monoglyceride)
0.450 parts by weight was melt-mixed at a resin temperature of 240 ° C. to obtain pellets.

Then, the resin with the resin of 85: 1
5 (weight ratio) was mixed to obtain a heat seal layer forming resin.

(2) Preparation of Resin for Forming Base Layer 100 parts by weight of isotactic polypropylene polymer were added to 1. Antifogging agent (higher fatty acid ester monoglyceride)
A base layer forming resin was prepared by mixing 000 parts by weight.

(3) A three-layer state in which a resin and a film-forming resin are melted at a ratio of 1: 9 (weight ratio) so that the resin temperature is 260 ° C. and heat seal layers are laminated on both sides of a base layer. Was coextruded from a T-die, cast with a casting roll at a temperature of 25 ° C., and then stretched 4 times in the machine direction and 9.5 times in the cross direction.

Then, the surface of the heat-sealing layer of the obtained film was subjected to corona discharge treatment, and the wetting tension of the surface of the corona discharge treated surface was 39 mN / m, the base layer was 18 μm, and the heat-sealing layer was 1 μm on one side. Got

Table 1 shows various characteristics of the obtained packaging film. As can be seen from this table, in addition to having excellent antifogging properties, it also has excellent slipperiness, blocking resistance, transparency and fusing heat seal properties.

Comparative Examples 1 to 4 Films of Comparative Examples 1 to 4 were obtained by changing the organic polymer fine particles and the inert fine particles contained in the heat seal layer as shown in Table 1 in Example 1. Table 1 shows various properties of the obtained packaging film.

In Comparative Example 1, since the blending ratio of the organic polymer fine particles is large and the fusing sealing strength is weak, there is a concern that the bag may be broken and the contents may pop out when the contents are lined up during packing, transportation and handling. There is.

In Comparative Example 2, the amount of the organic polymer fine particles and the inert fine particles was small, and the blocking resistance and the slipperiness were poor. Therefore, when the bag-made bags were stacked and stored, the mouth of the bag was blocked due to blocking. There is concern that it may be difficult to open or the bags may not separate. In addition, since slippage is poor, there is a concern that workability may be deteriorated due to poor alignment and alignment during bag making.

In Comparative Example 3, the amount of the organic polymer fine particles and the inert fine particles was large, and although the blocking resistance and the slipperiness were good, the transparency was remarkably poor. Therefore, when the contents are put in, the appearance is not good and the commercial value is lowered. Further, since it contains a large amount of fine particles, the expression of the antifogging agent is hindered, and the antifogging property becomes insufficient.

In Comparative Example 4, since the blending ratio of the organic polymer fine particles is small, the antifogging agent is adsorbed to the inert fine particles during the development process, and the antifogging property is deteriorated. For this reason,
Condensation is generated on the inner surface of the bag, and when the contents are put in, it does not look good and reduces the product value. In addition, since there are many inert fine particles, the transparency is poor.

[0061]

[Table 1]

[0062]

EFFECT OF THE INVENTION The packaging film of the present invention can have excellent anti-fogging property in packaging of fresh products and excellent sliding property, blocking resistance, and transparency.

According to the package of the present invention, it has excellent anti-fogging property as a package for fresh products, and also has slipperiness, blocking resistance and transparency.

Continued front page    (72) Inventor Ichiro Kitaura             344 Maebata, East Inuyama, Inuyama City, Aichi Prefecture             Inuyama Factory, Yobo Co., Ltd. F-term (reference) 3E086 AB01 AD01 BA04 BA15 BA35                       BB22 BB90 CA01 CA17 CA18                       CA19 CA22 DA03                 4F100 AA01H AK07A AK07B AK07C                       AK12H AK25H AK62 AK66                       AK80 BA02 BA03 BA10B                       BA10C CA23B CA23C DE01B                       DE01C EJ38A EJ38B EJ38C                       GB15 JL07 JL07A JL07B                       JL07C JL12B JL12C JN01

Claims (8)

[Claims] 1. A packaging comprising a laminate of two or more layers having a biaxially stretched base layer mainly composed of a polypropylene resin and a heat seal layer mainly composed of a polyolefin resin formed on at least one surface thereof. The film has an antifogging property on the surface of the heat seal layer, and the heat seal layer has organic polymer fine particles having an average particle size of 0.1 to 7.0 μm and an average particle size of 0.1 to 7. A packaging film comprising 0 μm of inert fine particles in an amount satisfying the following formulas (1) and (2) per 100 parts by weight of the resin forming the heat-sealing layer. 0.10 ≦ C ₁ / C ₂ ≦ 5.00 (1) 0.15 ≦ C _l + C ₂ ≦ 1.00 (2) C _l : Organic polymer fine particles having an average particle size of 0.1 to 7.0 μm Amount (parts by weight) C ₂ : Amount (parts by weight) of inert fine particles having an average particle size of 0.1 to 7.0 μm 2. The organic polymer fine particles are formed of one or more kinds of monomer components selected from acrylic acid-based monomers, methacrylic acid-based monomers and styrene-based monomers. The packaging film described. 3. The packaging film according to claim 1, wherein the inert fine particles are inorganic fine particles. 4. The packaging film according to claim 1, wherein an antifogging agent is present in at least the base layer and the heat seal layer. 5. At least two base layers and heat seal layers are provided.
The packaging film according to claim 1, 2, 3 or 4, which is axially stretched. 6. The packaging film according to claim 1, which is used for packaging fresh products. 7. The packaging film according to claim 1, which is used in an automatic packaging machine. 8. A package comprising the packaging film according to claim 1, 2, 3, 4, 5, 6 or 7.