JPH09235425A - Packaging film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a packaging film which is used in the form of a single- layer or multilayer film, is finally laminated with a base material such as a nylon, polyester or polypropylene film, and is used chiefly in the form of bags excellent in heat sealing strength, low-temperature heat sealability, flexibility, impact resistance, pinhole resistance, blocking resistance, slipperiness and openability. SOLUTION: This film is made from a composition comprising a linear low- density polyethylene having a density of 0.900-0.925g/cm<3> , 0.02-0.15wt.% at least one member selected from the group consisting of higher fatty acids, higher fatty acid amides and metal salts of higher fatty acids, and 0.05-1.00wt.% silicone resin by the air-cooled inflation method. It is laminated with a base material to form a multilayer structure in which it constitutes at least the surface which is to come into contact with the contents.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packaging film mainly used for pillow type bags, three-sided seal type bags, four-sided seal type bags, self-stereoscopic type bags and the like filled with foods and medicines. , More specifically, used as a single-layer or multi-layer film, finally nylon, polyester,
It is used mainly in the form of a bag by bonding it with a base material such as polypropylene film, and has heat seal strength, low temperature sealability, flexibility, impact resistance, pinhole resistance, blocking resistance, slipperiness, and bag opening property. It relates to an excellent packaging film.

[0002]

2. Description of the Related Art A packaging film having a linear low-density polyethylene having a density of 0.925 g / cm ³ or less as a heat-sealing layer, which is used for packaging foods and medicines, generally has heat-sealing strength and low-temperature heat resistance. It has excellent sealing properties, flexibility, impact resistance, and pinhole resistance, and is preferable as a packaging film.

However, these films have a low softening point and tend to be sticky as the density becomes smaller, and blocking, slippage and the like become more prominent. For this reason, film processability, suitability for secondary processing, and handleability are poor, film feeding failure with machine feed rolls and bag filling failure of contents occur, close contact between packaging materials and opening of bag ( In particular, it causes problems such as automatic filling machines. In particular, after being bonded to the base material, blocking and slippage defects become remarkable due to the curing temperature and the original roll winding pressure for promoting the curing of the adhesive.

Conventionally, in order to solve this problem, it has been attempted to prevent blocking and slippage by mainly adding a higher fatty acid amide type lubricant or an inorganic antiblocking agent such as silicon oxide / talc. Has been. Also,
Blocking and the like are also prevented by using a technique called embossing that mechanically roughens the surface of the film. Furthermore, it has been attempted to prevent blocking and the like by using a technique of spraying fine powder on the surface of the packaging material. However, if fatty acids and aliphatic lubricants are added to the extent that slipperiness can be imparted, the amount of precipitation on the film surface becomes too large, and the lubricant adheres to and deposits on packaging machines, etc. There are problems that the sealing property and the hot sealing property are deteriorated, and when they are bonded to a base material, they become an adhesion obstacle and the adhesion force is deteriorated.

The method of adding an inorganic anti-blocking agent is somewhat effective as an auxiliary agent for an organic lubricant, but it is difficult to sufficiently improve slipperiness and blocking, and the addition amount is large. If it is too much, there is a problem that the heat sealability is deteriorated, the transparency is deteriorated, or the surfaces of the packaging film are scratched when they are rubbed with each other. Further, the embossing method has a drawback that it loses the transparency required for the packaging film.

Moreover, it is necessary to prepare a special device for performing embossing, and when the device is introduced during the film manufacturing process, when processing a film that does not require embossing, it is necessary to switch the device. Since it is necessary, there is a drawback that the manufacturing process becomes extremely complicated. Further, when the corona discharge treatment is performed on one side, there is a problem that the heat seal surface on the opposite side is also treated due to the entrainment of fine air, resulting in a decrease in heat seal strength.

Further, the method of spraying fine powder on the surface of the packaging material has the drawback that the roll around the spraying machine and the roll of the secondary processing machine are contaminated with the powder, and the powder is mixed into the packaged object. There is. Therefore, the conventional linear low-density polyethylene packaging with a density of 0.925 g / cm ³ or less, which is excellent in heat-sealing strength, low-temperature heat-sealing property, flexibility, impact resistance, pinhole resistance, and adhesion to a base material. The film for use is inferior in blocking resistance, slipperiness and bag opening property, and cannot be said to be a suitable material as a packaging film.

[0008]

Therefore, an object of the present invention is to have excellent blocking resistance, slipperiness, bag opening property, and without the need for spraying fine powder, and also with excellent heat sealing strength and low temperature heat sealing property, An object of the present invention is to provide a packaging film which maintains flexibility, impact resistance and pinhole resistance as they are and does not cause adhesion inhibition.

[0009]

DISCLOSURE OF THE INVENTION The present invention has been proposed in order to achieve the above-mentioned object, in which a specific resin and a lubricant are selected, and a lubricant is combined in a specific amount range, and a specific processing is performed. It has important characteristics in the points obtained by the method. That is, according to the present invention, the density is 0.900 g /
cm ³ with respect to the linear low density polyethylene 0.925 g / cm ^3, higher fatty acids, to at least one 0.02 selected from the group consisting of higher fatty acid amide, and higher fatty acid metal salt 0.15 wt%, There is provided a packaging film comprising a composition containing 0.05 to 1.00% by weight of a silicone resin and formed by an air-cooled inflation method.

Further, according to the present invention, there is provided the packaging film according to claim 1, wherein the silicone resin is a graft polymer of polyorganosiloxane and a thermoplastic polyolefin resin. It

According to the present invention, the packaging film according to claim 1 or 2, wherein the packaging film has a multi-layer structure which is laminated with a base material and is formed on at least the surface in contact with the contents. A film is provided.

Further, according to the present invention, there is provided a packaging film according to claim 3, wherein the base material is at least one film selected from the group consisting of nylon, polyester and polypropylene. To be done.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION The technical feature of the present invention is that excellent heat seal strength can be obtained by adding a specific additive in a specific amount to a specific resin and by processing with a specific processing method. Low temperature heat sealability, flexibility, impact resistance, and pinhole resistance are maintained as they are, adhesion is not hindered, and there is no need to disperse powder, etc., excellent blocking resistance, slipperiness, and bag opening. It is possible to provide a packaging film.

That is, the packaging film of the present invention is
As polymer material, density 0.900 to 0.925
A linear low density polyethylene of g / cm ³ is adopted, and 0.05 to 1.00% by weight, preferably 0.1 to 0.4% by weight of a silicone resin and a higher fatty acid as a conventional lubricant are used. , One or more higher fatty acid amides and higher fatty acid metal salts in an amount of 0.02 to 0.1
An important feature is that 5% by weight is added together, and this is molded by an air-cooled inflation method.

[0015] Polymers used in the present invention is the density 0.900 g / cm ³ to linear low density polyethylene 0.925 g / cm ^3. In the linear low-density polyethylene, the comonomer copolymerized with ethylene includes propylene, 1-butene, 1-hexene and 4-
Methyl-1-pentene, 1-octene, decene and the like can be mentioned. In general, a comonomer having a larger number of carbon atoms tends to have a higher film strength, and is preferably used when increasing the packaging material strength.

The linear low-density polyethylene having a density of less than 0.900 g / cm ³ is too sticky and too soft, so that the laminating film containing silicone resin can be changed even if the amount and blending ratio are changed. It is not possible to obtain a film having good blocking resistance, slipperiness, and bag mouth opening property while maintaining other necessary functions. With linear low-density polyethylene having a density of more than 0.925 g / cm ³ , it is possible to obtain a film having good blocking resistance, slipperiness, and bag opening property even with the conventional formulation.

Further, in the case of a coextruded multilayer film, as for the resin for the layers other than the heat seal layer, the same linear low density polyethylene as that used in the heat seal layer or other linear low density polyethylene is used for the film strength physical properties and the like. Although it is preferable from the viewpoint, another polyolefin resin or the like may be used depending on the application. In this case, there is an advantage that cost control is easy.

As the lubricants of these polyolefins, higher fatty acid type ones represented by higher fatty acid amides are known, but these lubricants have a small molecular weight, and due to the micro-Brownian motion of the polymer segment, the lubricant of the film is formed. Bleed out on the surface, adheres and accumulates on the packaging machine and mixes into the packaged item, and easily causes problems such as deterioration of heat sealability and hot sealability, and inhibition of adhesion. For this reason, the addition amount is changed depending on the type and thickness of the resin, and the maximum allowable amount that does not cause adhesion inhibition is added. However, even if intentionally added in large amounts, sufficient sliding performance cannot be obtained. Especially for thick films, the absolute amount of lubricant bleed out to the surface is large,
There is a large limitation on the amount added, and there are major problems with blocking resistance, slipperiness, and bag opening.

However, at this time, the present inventors have confirmed that a specific amount of silicone resin and a specific amount of higher fatty acid,
By combining at least one selected from the group consisting of higher fatty acid amides and higher fatty acid metal salts, the blocking resistance of the linear low-density polyethylene film,
It was found that the slipperiness and the bag mouth opening property are remarkably excellent. In the present invention, the silicone resin is a polymer having a three-dimensional network structure having a silicon-oxygen bond as a skeleton (silicon resin), or a graft polymer of a polyorganosiloxane and a polyolefin-based thermoplastic resin, It does not include linear silicone oil that does not have a network structure, silicone grease that partially has a cross-linking bond, or silicone rubber. This is because, in the case of silicone oil, silicone grease, or silicone rubber, it easily migrates to the surface of the film and is likely to be eluted, migrated, or transferred to the object to be packaged, and also causes poor heat sealing or poor adhesion.

As the silicone resin, a non-melt type average particle diameter of 0.3 to 12.0 μm, preferably 0.1.
Fine powder resin of 8 to 3 μm can also be used, but in particular, those obtained by graft-polymerizing polyorganosiloxane and thermoplastic resin are preferable in terms of compatibility, dispersibility, powder falling property, handleability, cost, etc., and food hygiene. There is no problem with the above.
As the thermoplastic resin of the graft polymer, low density polyethylene, ethylene-α, β containing 80% by weight or more of ethylene
Although there are unsaturated carboxylic acid copolymers, ethylene-α, β unsaturated carboxylic acid ester copolymers, etc., low density polyethylene is preferable from the viewpoint of transparency and the like. The silicone content of the graft polymer is preferably 40 to 80% by weight from the viewpoint of cost and dispersibility.

Since the silicone resin, which is a block copolymer with polyolefin, is a polymer, it does not bleed out on the surface of the film even if it is blended with linear low-density polyethylene, and there is a risk of powder falling. Absent. If the non-melting type silicone resin powder also has a particle size on the order of microns, it does not diffuse and migrate inside the polymer, but the fine powder on the film surface may fall off slightly. Generally, silicone resins are known to have lubricity and non-adhesiveness. However, in the present invention, addition of a silicone resin alone does not show an improving effect on slipperiness and the like, and is represented by higher fatty acid amides. It has been found that even in the case of combined use with such a lubricant, if the added amount of the combined lubricant is too small, there is no effect. Furthermore, it has been found that when the silicone resin exceeds a certain addition amount, the improvement effect becomes insensitive and the anti-blocking property becomes good, but conversely the slip property becomes worse.

A large effect can be obtained when the amount of the lubricant used in the prior art is less than the amount in the conventional restricted range which does not affect the heat sealing property or the inhibition of adhesion. However, as a peculiar point, the silicone resin is effective even when added in a small amount,
If it exceeds 1.00% by weight, the improvement effect becomes insensitive or the blocking resistance becomes good, but on the contrary, the slipperiness becomes worse. On the other hand, if the amount exceeds 1.00% by weight, the heat sealability and the transparency may be deteriorated, and the economical efficiency may be deteriorated. If the amount of silicone resin added is less than 0.05% by weight,
The effect of improving slippage is small, which is not preferable.

The lubricant used in combination with the silicone resin in the present invention is at least one selected from the group consisting of higher fatty acids, higher fatty acid amides and higher fatty acid metal salts. Specifically, stearic acid, erucic acid amide,
Stearic acid amide, oleic acid amide, calcium stearate, magnesium stearate, etc.,
Among these, erucic acid amide, oleic acid amide, and stearic acid amide are preferably used.

The amount of the lubricant blended depends on the thickness of the film and the total amount of the lubricant in all layers in the case of coextrusion, but it is 0.0
2 to 0.15% by weight, particularly 0.10 to 0.1 when the thickness of the silicone resin-containing layer is less than 30 μm.
5% by weight, 0.04 if less than 30 to 80 μm
0.10% by weight, and when it exceeds 80 μm, 0.
02 to 0.04% by weight is preferred. Here, in the case of a coextruded film, it is preferable that the lubricant addition concentration of the non-silicone resin blending layer is also the same as that of the silicone resin blending layer depending on the thickness of the non-silicone resin blending layer.

The amount of the above-mentioned lubricant such as higher fatty acid added is 0.0
If it is less than 2% by weight, the effect of improving slippage or the like cannot be obtained, or a considerable amount of time is required until the effect is exhibited. On the other hand, if it exceeds 0.15% by weight, the lubricant is likely to be transferred to a machine or the like, or heat seal failure or adhesion failure is likely to occur. As a film processing method, there are generally inflation, casting, extrusion laminating method and the like, but the reason for defining the air-cooled inflation method in the present invention is that the lubricant formulation is defined in the present invention,
This is because the film obtained by the air-cooled inflation method has excellent blocking resistance, slipperiness, and bag opening property.In the transparent type cast and extrusion laminating process, even if this formulation is used, Excellent blocking resistance, slipperiness, and
The bag cannot be opened.

Further, in the present invention, an inorganic anti-blocking agent such as silicon oxide, talc, diatomaceous earth, zeolite or kaolin may be added in an amount of 0.1 to 1.0%. In this case, the transparency may be deteriorated, the heat sealability may be deteriorated, and scratches on the inner surface of the bag may occur. Further, the film of the present invention,
In addition to the above-mentioned compounding agents, other lubricants such as fatty acid hydrocarbons, fatty acid alcohols, polyglycols, fatty acid esters, antioxidants, ultraviolet absorbers, antistatic agents, flame retardants, as long as the object of the present invention is not impaired. Known compounding agents such as dyes, dyes and pigments may be added.

The packaging film according to another aspect of the present invention has the composition according to claim 1 bonded to a substrate and at least a surface in contact with the contents. Thus, the surface which comes into contact with the contents of the packaging film is claimed in claim 1.
By forming with the composition described above, excellent blocking resistance, slipperiness, and bag opening property are exhibited. In the present invention, examples of the bonding substrate include a film of polyolefin, cellophane, polypropylene, nylon, polyester, etc., and a vinylidene chloride coating film of the film, further, paper, aluminum foil, polyvinyl alcohol film, ethylene vinyl. Alcohol films, polystyrene films, vinyl chloride films, polycarbonate films, multilayer films of these, and the like, among which at least one film made of nylon, polyester, and polypropylene is preferably used.

[0028]

EFFECTS OF THE INVENTION According to the present invention, the performance of the film having excellent heat sealability, flexibility, impact resistance and the like is maintained as it is, adhesion is not hindered, and there is no need to spray powder or the like.
Provided is a packaging film having excellent blocking resistance, slipperiness, and bag opening property.

[0029]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on embodiments. This example is intended to disclose a preferred embodiment of the present invention, but is not intended to limit the present invention.

Example 1 A graft polymer of a linear low density polyethylene (comonomer: 1-hexene) having a density of 0.921 g / cm ³ and a silicone resin (40% by weight of polyorganosiloxane and 60% by weight of low density polyethylene). ) 0.2% by weight (silicone resin concentration 0.08% by weight) and oleic acid amide 0.07% by weight were added, and a film having a thickness of 0.05 mm was obtained by an air cooling type inflation method. Further, one side of this film was subjected to corona discharge treatment, and was dry laminated with biaxially stretched nylon using a urethane adhesive.

< Example 2 > Linear low density polyethylene having a density of 0.920 g / cm ³ (comonomer: 4-methyl-
1-pentene) with 0.3% by weight of silicone resin (40% by weight of polyorganosiloxane and 60% by weight of low-density polyethylene).
2% by weight) and 0.07% by weight of stearic acid amide were added, and a film having a thickness of 0.05 mm was obtained by an air-cooled inflation method. Further, one side of this film was subjected to corona discharge treatment, and was dry laminated with biaxially stretched nylon using a urethane adhesive.

< Example 3 > Linear low density polyethylene having a density of 0.915 g / cm ³ (comonomer: 4-methyl-
0.5% by weight of a silicone resin (40% by weight of polyorganosiloxane and 60% by weight of low-density polyethylene, a graft polymer) on 1-pentene) (concentration of silicone resin: 0.
2% by weight) and 0.08% by weight of erucic acid amide,
A film having a thickness of 0.05 mm was obtained by the air-cooled inflation method. Further, one side of this film was subjected to corona discharge treatment, and was dry laminated with biaxially stretched nylon using a urethane adhesive.

Comparative Example 1 Linear low density polyethylene having a density of 0.915 g / cm ³ (comonomer: 4-methyl-
1-pentene), 0.08% by weight of erucic acid amide,
0.2% by weight of silicon oxide was added, and a film having a thickness of 0.05 mm was obtained by an air-cooled inflation method. Further, one side of this film was subjected to corona discharge treatment, and was dry laminated with biaxially stretched nylon using a urethane adhesive.

Comparative Example 2 Linear low density polyethylene having a density of 0.915 g / cm ³ (comonomer: 4-methyl-
1-pentene), 0.16% by weight of erucic acid amide,
0.2% by weight of silicon oxide was added, and a film having a thickness of 0.05 mm was obtained by an air-cooled inflation method. Further, one side of this film was subjected to corona discharge treatment, and was dry laminated with biaxially stretched nylon using a urethane adhesive.

Comparative Example 3 Linear low density polyethylene having a density of 0.915 g / cm ³ (comonomer: 4-methyl-
5.0% by weight of a silicone resin (40% by weight of polyorganosiloxane and 60% by weight of low-density polyethylene, a graft polymer) on 1-pentene (concentration of silicone resin: 2.
0% by weight), erucic acid amide 0.08% by weight, and silicon oxide 0.2% by weight were added, and a film having a thickness of 0.05 mm was obtained by an air-cooled inflation method. Further, one side of this film was subjected to corona discharge treatment, and was dry laminated with biaxially stretched nylon using a urethane adhesive.

Comparative Example 4 Linear low density polyethylene having a density of 0.915 g / cm ³ (comonomer: 4-methyl-
0.5% by weight of a silicone resin (40% by weight of polyorganosiloxane and 60% by weight of low-density polyethylene, a graft polymer) on 1-pentene) (concentration of silicone resin: 0.
2% by weight), 0.01% by weight of erucic acid amide, and 0.2% by weight of silicon oxide were added, and a film having a thickness of 0.05 mm was obtained by an air-cooled inflation method. Further, one side of this film was subjected to corona discharge treatment, and was dry laminated with biaxially stretched nylon using a urethane adhesive.

Comparative Example 5 Linear low density polyethylene having a density of 0.915 g / cm ³ (comonomer: 4-methyl-
0.5% by weight of a silicone resin (40% by weight of polyorganosiloxane and 60% by weight of low-density polyethylene, a graft polymer) on 1-pentene) (concentration of silicone resin: 0.
2% by weight), 0.10% by weight of erucic acid amide, and 0.2% by weight of silicon oxide, and by extrusion coating,
A transparent type extrusion coating was performed to a thickness of 0.03 mm on a film in which biaxially stretched nylon was extrusion-coated with a low-density polyethylene having a thickness of 0.020 mm.

Comparative Example 6 Linear low density polyethylene having a density of 0.915 g / cm ³ (comonomer: 4-methyl-
0.5% by weight of a silicone resin (40% by weight of polyorganosiloxane and 60% by weight of low-density polyethylene, a graft polymer) on 1-pentene) (concentration of silicone resin: 0.
2% by weight), erucic acid amide 0.08% by weight, and silicon oxide 0.2% by weight were added, and a transparent type film having a thickness of 0.05 mm was obtained by a casting method. Further, one side of this film was subjected to corona discharge treatment, and was dry laminated with biaxially stretched nylon using a urethane adhesive.

Example 4 Linear low-density polyethylene (comonomer: 4-methyl-) having a density of 0.910 g / cm ^3.
0.5% by weight of a silicone resin (40% by weight of polyorganosiloxane and 60% by weight of low-density polyethylene, a graft polymer) on 1-pentene) (concentration of silicone resin: 0.
2% by weight), 0.07% by weight of erucic acid amide, 0.01% by weight of stearic acid and 0.2% by weight of silicon oxide, and this resin and 0.08% by weight of erucic acid amide, 0.2% of silicon oxide. Linear low density polyethylene with a density of 0.910 g / cm ³ containing wt% (comonomer: 4-methyl-
1-pentene) is co-extruded by an air-cooled inflation method to give a thickness ratio of 1: 4, and a total thickness of 0.05 mm.
Was obtained. Corona discharge treatment was applied to the surface side of the non-silicone resin-added layer, and dry lamination with biaxially stretched nylon was performed using a urethane adhesive.

Comparative Example 7 Linear low density polyethylene (comonomer: 4-methyl-) having a density of 0.910 g / cm ³
1-pentene), 0.07% by weight of erucic acid amide,
Stearic acid 0.01% by weight, silicon oxide 1.0% by weight
And 0.08% by weight of this resin and erucic acid amide,
Density containing 0.2% by weight of silicon oxide 0.910 g / cm
³ of linear low density polyethylene (comonomer: 4-methyl-1-pentene) were coextruded by air-cooled inflation method, total thickness thickness ratio is 1: 4 0.05
mm of film was obtained. Corona discharge treatment was applied to the surface side of the non-silicone resin-added layer, and a urethane adhesive was used for dry lamination with biaxially stretched nylon.

Comparative Example 8 Linear low density polyethylene having a density of 0.910 g / cm ³ (comonomer: 4-methyl-
1-pentene), 0.07% by weight of erucic acid amide,
Stearic acid 0.01% by weight, silicon oxide 0.2% by weight
And 0.08% by weight of this resin and erucic acid amide,
Density containing 0.2% by weight of silicon oxide 0.910 g / cm
³ of linear low density polyethylene (comonomer: 4-methyl-1-pentene) were coextruded by air-cooled inflation method, total thickness thickness ratio is 1: 4 0.05
mm of film was obtained. Corona discharge treatment was applied to the surface side of the non-silicone resin-added layer, and dry lamination with biaxially stretched nylon was performed using a urethane adhesive. Further, 0.1 g / m ² of powder (Nikkari powder: manufactured by Nikka Co., Ltd.) was sprayed on the linear low-density polyethylene surface side of this dry laminated product.

Example 5 A linear low-density polyethylene (comonomer: 1-hexene) having a density of 0.905 g / cm ^{3 was} added to a silicone resin (polyorganosiloxane 40).
% By weight and 60% by weight of low-density polyethylene) 0.7% by weight (silicone resin concentration 0.28% by weight), erucic acid amide 0.09% by weight, calcium stearate 0.01% by weight, and air-cooled A film having a thickness of 0.05 mm was obtained by the expression inflation method. Further, one side of this film was subjected to corona discharge treatment, and was dry laminated with biaxially stretched nylon using a urethane adhesive.

Comparative Example 9 Linear low density polyethylene having a density of 0.89 g / cm ³ (comonomer: 1-butene)
And silicone resin (40% by weight of polyorganosiloxane and 60% by weight of low-density polyethylene graft polymer)
1.0 wt% (silicone resin concentration 0.4 wt%), erucic acid amide 0.09 wt%, silicon oxide 0.2 wt% were added, and this resin and erucic acid amide 0.08 wt%, silicon oxide Density including 0.2% by weight 0.910 g /
cm ³ linear low-density polyethylene (comonomer: 4-
Methyl-1-pentene) was coextruded by an air-cooled inflation method to give a total thickness of 0.
A 05 mm film was obtained. Also, this density 0.910
Corona discharge treatment was applied to the linear low-density polyethylene surface side of g / cm ³ , and dry lamination with biaxially stretched nylon was performed using a urethane adhesive.

In order to understand the characteristics of the above-mentioned Examples 1 to 5 and Comparative Examples 1 to 9, tests of sliding property, blocking resistance, heat-sealing property, adhesive strength of dry laminated products and the like were conducted. Was carried out and the results are shown in Table 1. For reference, the density is 0.935 g /
cm ³ linear low-density polyethylene (comonomer: 1-
When the impact strength of the octene) blown film was examined, it was 90 J / cm 2 and the number of pinholes was 30.

[0045]

[Table 1]

The coefficient of static friction in the column of "Sliding property of film" in Table 1 above is the coefficient of friction between the surfaces of the film which have not been subjected to corona discharge machining. A coefficient of static friction of less than 0.2 is represented by O, a coefficient of static friction of 0.2 to less than 0.5 is represented by Δ, and a coefficient of static friction exceeding 0.5 is represented by X. In addition, the static friction coefficient in the column of "sliding property of laminated product" in Table 1 is 40 after lamination.
It is a coefficient of friction between untreated surfaces of a film aged at 48 ° C. for 48 hours. A coefficient of static friction of less than 0.2 is ◯, 0.
A value from 2 to less than 0.5 is indicated by Δ, and an element exceeding 0.5 is indicated by x.

In addition, "Opening property of laminated bag" in Table 1
After laminating, make a flat bag with a three-sided seal using a film that has been aged at 40 ° C for 48 hours.
The bag was allowed to stand for 2 days at KPa, and the opening property of the bag was examined, which also serves as a blocking resistance test. The bag which was easily opened without being caught by the fingers of one hand was marked as ○, the one which was caught first but opened by the fingers of one hand was marked as △, and the one which could not be completely opened by the fingers of one hand was marked as ×.

Further, in the column of "Heat-sealing property of laminated product" in Table 1, the complete heat-sealing temperature of the laminated product of each film without addition of additives such as lubricants (nylon breakage, heat-sealing strength is 49 N / 15m
Even if the complete heat-sealing temperature of the laminated product of the film to which each additive is added shifts to the high temperature side for a heat-sealing temperature exceeding m, a sealing time of 0.3 seconds, and a sealing pressure of 0.2 MPa). Those that are within ◯ are those that are within 5 ° C are △, those that do not break nylon and whose heat seal strength does not exceed 49 N / 15 mm ×
And

Further, "Adhesive strength of laminated product" in Table 1
The adhesive strength in the column is a measurement of the adhesive strength between the biaxially stretched nylon of the dry laminate and the linear low-density polyethylene film. However, in Comparative Example 5, the adhesive strength between the low density polyethylene and the linear low density polyethylene film was measured. 8 N / 15 mm
Those above were rated as ◯ and those below 4 N / 15 mm were rated as × (pulling speed 300 mm / min, 180 ° peeling).

Further, the scratches in the column of "Scratches on laminated products" in Table 1 are those which scarcely scratch the scratched parts even if the inner surfaces of the three-side sealed flat bag are rubbed with the fingers 10 times. The case where the entire surface became white due to scratches was marked with x. In addition, in the column of "presence or absence of powder" in Table 1, "○" indicates that the powder could not be confirmed because the powder was not sprayed on the surface of the laminate film, and "x" indicates that the powder could be visually confirmed. . The measurement conditions for "impact strength" in Table 1 are JIS P8
The number of pinholes for "pinhole resistance" is based on the Gelbo flex tester (US military standard MIL B131).
) Is the number of pinholes when performed at 23 ° C. and 4000 times.

Continuation of front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display area C08L 83:10)

Claims (4)

[Claims] 1. A density of 0.900 g / cm ³ to 0.9.
For linear low density polyethylene of 25 g / cm ³ ,
0.02 to 0.15% by weight of at least one kind selected from the group consisting of higher fatty acids, higher fatty acid amides and higher fatty acid metal salts, silicone resin 0.05 to 1.
A packaging film comprising a composition containing 100% by weight and formed by an air-cooled inflation method. 2. The packaging film according to claim 1, wherein the silicone resin is a graft polymer of a polyorganosiloxane and a thermoplastic polyolefin resin. 3. The packaging film according to claim 1, which is laminated with a base material and has a multi-layer structure in which the film is formed at least on the surface in contact with the contents. 4. The packaging film according to claim 3, wherein the base material is at least one film selected from the group consisting of nylon, polyester and polypropylene.