KR101019656B1 - Resin composition of elastomer and metallocene polyethylene and film using the same - Google Patents

Abstract

PURPOSE: A polyolefin-based resin composition is provided to produce a reinforced film with excellent sealing property, transparency, tensile strength, impact strength and stiffness even in small thickness. CONSTITUTION: A polyolefin-based resin composition for a film comprises (A) 7-20 weight% of elastomer resin, (B) 40-60 weight% of polyethylene polyethylene resin polymerized under a metallocene catalyst, (C) 20-45 weight% of low density polyethylene, (D) 7-20 weight% of polyethylene resin consisting of ethylene and 1-octene, or a copolymer of ethylene and 1-hexene, polymerized in the presence of Ziegler-Natta catalysts, and (E) 0.01-10 weight% of at least one additives selected from coated calcium carbonate, slip agent, neutralizing agent or blocking agent.

Description

Resin composition of elastomer and metallocene polyethylene and film using the same}

The present invention relates to a composition comprising an ultra low density polyolefin (elastomer) and a metallocene polyethylene resin, and to an industrial packaging reinforcing film using the same, wherein the sealing, transparency, The present invention relates to a polyolefin resin composition capable of providing a film exhibiting excellent properties such as tensile strength, impact strength, stiffness, and the like, and a film including the composition.

Packaging film using polyolefin is used in various industrial applications such as electrical appliances, electronic products, brick packaging, logistics packaging, etc., and packaging industry for preventing the drift of the contents of the package due to perfect packaging, rapid transportation and dust prevention. Along with this logistics automation, it has developed rapidly in recent years.

On the other hand, various kinds of synthetic resins have appeared to provide the properties of the packaging film suitable for the purpose, in order to manufacture a film of high rigidity, high transparency to meet the needs of the user, by using the molecular properties of the existing polyethylene low density Shrink wrap based on polyethylene (LDPE) resin, or low density polyethylene (LDPE) and linear low density polyethylene (LLDPE) products that can pack more packages with less resin volume while having excellent mechanical properties. Has been developed.

However, the single use of the above-mentioned LDPE or LLDPE film cannot satisfy the high transparency, tensile and high rigidity, and thus the physical properties required by the customer are manufactured by blending various resins. Methods of producing high transparency films with improved heat sealing and improved tensile strength, impact and stiffness are continuously being developed.

The present invention has been made in order to provide a high-transparency film with improved high transparency and tensile strength, impact and rigidity, sealing, transparency, tensile strength, impact strength and stiffness even at a small thickness An object of the present invention is to provide a polyolefin-based resin composition capable of providing this excellent reinforcing film.

Another object of the present invention is to provide a polyolefin-based reinforcement film made of the resin composition.

In order to achieve the above object, the present invention provides A) 7 to 20% by weight of elastomer resin, B) 40 to 60% by weight of metallocene polyethylene resin polymerized under metallocene catalyst, C) 20 to 45% by weight of low density polyethylene resin. %; D) 7 to 20% by weight polyethylene resin consisting of a copolymer of ethylene and 1-octene or a copolymer of ethylene and 1-hexene polymerized under a Ziegler-Natta catalyst and E) a coated calcium carbonate, slip agent, neutralizing agent or blocking agent It provides a polyolefin resin composition for films consisting of 0,01 to 10% by weight of one or more additional components. At this time, the additional component may be added and processed in the form of a masterbatch.

Moreover, in order to achieve the said objective, this invention provides the reinforcement film formed from the said resin composition.

As another example for achieving the above object, the present invention provides a composition comprising: A) 7 to 20% by weight of an elastomer resin, B) 40 to 60% by weight of a metallocene polyethylene resin polymerized under a metallocene catalyst, and C) a low density polyethylene resin. 20 to 45% by weight and D) silica based on a basic resin film in which 7 to 20% by weight of a polyethylene resin composed of ethylene and 1-octene or a copolymer of ethylene and 1-hexene polymerized under a Ziegler-Natta catalyst is uniformly blended. Provided is a reinforcing film formed of a polyolefin resin composition in which at least one of a blocking agent, an amide slip agent and a coated calcium carbonate is dispersed in the base resin film.

On the other hand, the resin film may include a stearate-based porous neutralizer dispersed in the film.

The resin composition of the present invention may be used as a copolymer of ethylene and 1-octene or ethylene and 1-hexene as the D) component, and more preferably, a copolymer of ethylene and 1-octene may be used.

Hereinafter, the polyolefin resin composition of the present invention and the reinforcing film using the same will be described in detail for each component mainly on the resin composition.

First, the polyolefin resin composition of the present invention is A) 7 to 20% by weight of the elastomer resin, B) 40 to 60% by weight of the metallocene polyethylene resin polymerized under a metallocene catalyst, C) 20 to 45% by weight of the low density polyethylene resin, D) 7 to 20% by weight polyethylene resin consisting of ethylene and 1-octene polymerized under a Ziegler-Natta catalyst or a copolymer of ethylene and 1-hexene and E) selected from coated calcium carbonate, slip, neutralizer or blocking agent 0,01 to 10% by weight of one or more additional ingredients.

The elastomer resin of component A) preferably has a melt index of 0.5 to 2 g / 10 min (190 ° C. 2.16 kg), more preferably 0.7 to 1.5 g / 10 min (190 ° C. 2.16 kg), Most preferably, the melt index is 0.9 to 1.3 g / 10 min (190 ° C. 2.16 kg). It is also preferred that the elastomer has a density in the range of 0.865 g / ml to 0.875 g / ml, more preferably in the range of 0.867 g / ml to 0.873 g / ml, most preferably from 0.869 g / ml to It may have a value of 0.871 g / ml.

The elastomer resin is included in the total resin composition in the range of 7 to 20% by weight, preferably in the range of 10 to 20% by weight. When the content of the elastomer resin is less than or above the above range, there is a tendency that the transparency, sealing at low temperatures, stiffness, or stickiness are increased.

The metallocene polyethylene resin of the B) component of the present invention is polymerized under a metallocene catalyst, and exhibits narrow molecular weight distribution and excellent physical properties by being composed of uniform molecules. Sealing, transparency, tensile strength, impact strength and stiffness can be improved even with a thickness smaller than that of a film made of polyethylene resin.

The metallocene polyethylene resin of the present invention uses a copolymer of ethylene and 1-hexene or ethylene and 1-octene under a metallocene catalyst, and 1-hexene or 1-octene is 5 to 10 with respect to ethylene in the copolymer. It may be included in the ratio of mole%.

When the ratio of alpha olefin (1-hexene) is low, the density tends to be high and stiff, and when the ratio is out of the ratio, the ratio is low and tends to be soft. It would be desirable to maintain a proper hardness.

In addition, it is preferable that the metallocene polyethylene resin having a density of 0.915 g / ml to 0.925 g / ml is preferable in terms of maintaining hardness, and more preferably 0.917 g / ml to 0.922 g / ml. Good to do.

Meanwhile, the melt index is preferably 0.5 to 2 g / 10 min (190 ° C. 2.16 kg), more preferably the melt index is 0.7 to 1.5 g / 10 min (190 ° C. 2.16 kg), and most preferably the melt index is It is preferable that it is 0.9-1.3 g / 10min (190 degreeC. 2.16 kg), and it is preferable to use what has a soluble content of 1-5 weight%.

As the metallocene polyethylene resin having the above characteristics is included, the metallocene-based polyethylene resin composition of the present invention may improve sealing, transparency, tensile strength, impact strength, and stiffness with a small thickness. To be able.

The metallocene polyethylene resin is included in the total resin composition in the range of 40 to 60% by weight, preferably in the range of 40 to 55% by weight. When the content of the metallocene polyethylene resin is less than the above range, stiffness and impact strength tend to decrease when the film is formed, and when the content exceeds the above range, sealing at low temperatures This tends to be poor and the transparency is lowered.

The low density polyethylene resin of the C) component of the present invention may preferably be included in the range of 20 to 45% by weight, more preferably 20 to 40% by weight in the total resin composition.

In addition, the physical properties of the resin used is preferably a melt index of 1 to 7 g / 10min (190 ℃. 2.16kg), more preferably a melt index of 2 to 5 g / 10min (190 ℃. 2.16kg) Most preferably, a melt index of 2.5 to 3.5 g / 10 min (190 ° C. 2.16 kg) may be used.

In addition, the density is preferably from 0.920 g / ml to 0.925 g / ml, more preferably from 0.922 g / ml to 0.924 g / ml.

The copolymer of ethylene and 1-octene or ethylene and 1-hexene, which is the D) component of the present invention, is a copolymer of ethylene and 1-octene or ethylene and 1-hexene under Ziegler-Natta catalyst and has excellent processing characteristics. Since the resin composition of the present invention exhibits optical properties and optical properties, sealing, transparency, tensile strength, impact strength, and stiffness may be improved even with a thickness smaller than that of a conventional polyethylene resin.

The copolymer of ethylene and 1-octene or ethylene and 1-hexene is preferably included in the total resin composition in the range of 7 to 20% by weight, preferably in the range of 10 to 20% by weight.

When the copolymer of ethylene and 1-octene or ethylene and 1-hexene is less than the above range, the transparency tends to decrease and the processing load tends to increase, and when the content exceeds the above range, the impact strength decreases. There exists a tendency for sealing property to fall.

In addition, the physical properties of the resin used is preferably in the case of 1-octene copolymer, the melt index is 0.5 to 2 g / 10min (190 ℃. 2.16kg), more preferably the melt index is 0.7 to 1.5g / 10 min (190 ° C. 2.16 kg), and most preferably the melt index is 0.9 to 1.3 g / 10 min (190 ° C. 2.16 kg). In addition, the density is preferably in the range of 0.915 g / ml to 0.923 g / ml, and more preferably in the range of 0.917 g / ml to 0.919 g / ml.

In addition, in the case of 1-hexene copolymer, the melt index is preferably 1 to 3 g / 10 min (190 ° C. 2.16 kg), and more preferably the melt index is 1.5 to 2.5 g / 10 min (190 ° C. 2.16 kg). ), And most preferably the melt index is 1.7 to 2.3 g / 10 min (190 ° C. 2.16 kg). In addition, the density is preferably in the range of 0.915 g / ml to 0.925 g / ml, and more preferably in the range of 0.918 g / ml to 0.922 g / ml.

In addition, the resin composition of the present invention may be added to the high density polyethylene (HDPE) to improve the physical properties in addition to the components of the composition, if necessary. The amount to be added is freely adjustable within the range of 0.1 to 10% by weight, the physical properties of the high-density polyethylene used is preferably a melt index of 0.5 to 2 g / 10min (190 ℃. 2.16kg), more preferably It is preferable that the melt index is 0.7 to 1.5 g / 10 min (190 ° C. 2.16 kg), and most preferably the melt index is 0.9 to 1.3 g / 10 min (190 ° C. 2.16 kg), and the density is 0.945 g / ml to It is preferably in the range of 0.955 g / ml, more preferably in the range of 0.947 g / ml to 0.953 g / ml.

On the other hand, the blocking agent used in the polyolefin resin composition of the present invention may be a silica-based blocking agent having an average particle size of 1 to 7㎛, the surface area of 50 to 100m 2 / g.

The silica-based blocking agent may play a role of trapping soluble components such as low molecular weight substances in the resin composition in the porous structure to prevent migration to a surface such as a film made of the resin composition.

Such a silica-based blocking agent has a high porosity and it is preferable to use a large pore area. For this purpose, using a surface area of 50 to 100 m 2 / g to collect the soluble components in the pores to the film surface of the soluble component It will be beneficial to express the effect of reducing the implementation of

It is preferable to use the silica-based blocking agent having an average particle size of 1 to 7㎛, when the average particle size is larger than the above range, the transparency of the film tends to be lowered so as not to lower the transparency of the film It is preferable to use a silica-based blocking agent that can effectively collect the soluble content in the interior.

The silica-based blocking agent is included in the range of 0.1 to 0.5% by weight of the total composition, when the content of the silica-based blocking agent is less than the above range, it is difficult to effectively collect the soluble content, if the content exceeds the above range, the transparency of the film is lowered There is a tendency.

The polyolefin resin composition of the present invention may include an amide-based slip agent. The amide-based slip agent is included in the resin composition plays a role of showing the opening characteristics in the film composed of these resin compositions.

The amide-based slip agent is included in the range of 0.1 to 0.5% by weight of the total composition, if the content of the amide-based slip agent is less than the above-mentioned range, there is a tendency of poor opening, and if the content of the amide-based slip agent exceeds the above range, the film is transferred to the film surface and whitened. There is a tendency.

The resin composition of the present invention may contain a fluorocarbon processing aid. The fluorocarbon-based processing aid is included in the metallocene-based polyethylene resin composition plays a role of showing the characteristics of the processability improvement.

Such fluorocarbon processing aids are those having a fluorine content of 40 to 70% by weight, preferably 40 to 60% by weight. If the fluorine content is less than the above range, the fluorine coating inside the extruder may take a long time. In this case, if the amount exceeds the above range, a factor of cost increase occurs. Therefore, it is preferable to select and use the fluorine content in the above range.

The fluorocarbon-based processing aid may be included in the 0.01 to 0.5% by weight of the total metallocene-based polyethylene resin composition of the present invention, when the content of the fluorocarbon-based processing aid is less than the above range tends to be inferior in workability, exceeds the above range If so, cost rises.

On the other hand, the resin composition of the present invention may further comprise a stearate-based porous neutralizer in addition to the above-described components. The neutralizing agent used in the polyolefin resin composition of the present invention may be a stearate-based, or a coating of zinc (Zn) stearate or calcium (Ca) stearate based on calcium carbonate.

The stearate-based porous neutralizer serves to further suppress the migration of soluble components such as low-molecular substances to the surface of the film in the reinforcing film made of the polyolefin resin composition together with the silica-based blocking agent.

The stearate-based porous neutralizer may be a zinc (Zn) content of 10.5 to 11.5%, the stearate-based porous neutralizer may be used having an average particle size of 10 to 20㎛. 0.01 to 0.5 wt% of the stearate-based porous neutralizing agent may be further included.

On the other hand, the resin composition may further include a general additive within the range that does not inhibit the achievement of the object of the present invention in addition to each component described above, the additive may further include, for example, antioxidant, antistatic agent, etc. It may be.

Said polyolefin resin composition can form a reinforcement film by the following method.

The polyolefin resin composition is blended using a mixer and then extruded using an extrusion means at a processing temperature in the range of 130 to 200 ° C. At this time, the extruder molding temperature is preferably 140 to 180 ℃, the extruder molding speed is extruded under the processing conditions of 40 to 100 rpm to form a reinforcing film.

The polyolefin reinforcement film of the present invention comprises: A) 7 to 20% by weight elastomer resin, B) 40 to 60% by weight metallocene polyethylene resin polymerized under metallocene catalyst, C) 20 to 45% by weight low density polyethylene resin, and D Silica-based blocking agent and amide slip on a basic resin film in which 7 to 20% by weight of a polyethylene resin composed of ethylene and 1-octene or a copolymer of ethylene and 1-hexene polymerized under a Ziegler-Natta catalyst is uniformly blended. At least one of the agent and the coated calcium carbonate may be formed in a form including a reinforcing film formed of a polyolefin resin composition dispersed in the base resin film.

 The present invention can maintain a high stiffness even with a small thickness compared to the existing polyethylene film as it includes the base resin film as described above, excellent transparency and flexibility, silica-based blocking agent, amide slip agent or coating By including the prepared calcium carbonate, the film opening properties and processability are easily improved.

On the other hand, the reinforcing film of the present invention may further include a stearate-based porous neutralizer dispersed in the base resin film.

 The reinforcement film of the present invention as described above serves as an industrial packaging material that can not be easily torn during weathering or handling when applied, and can safely protect the contents.

   By using the polyolefin resin composition of the present invention described above, it is possible to provide a high transparency film having improved heat sealing and improved tensile strength, impact, and rigidity, thereby maintaining high rigidity even at a small thickness. The reinforcement film excellent in transparency and flexibility can be provided.

The metallocene-based polyethylene-reinforced film is suitable for use in air cargo packaging or pallet cover because it can protect the contents safely without being easily torn during weathering or handling when applied as an industrial packaging material.

Hereinafter, the present invention will be described in detail with reference to Examples, but the present invention is not limited by the following Examples.

15% by weight of an elastomer (Dow) resin with a melt index of 1.0 g / 10min (190 ° C. 2.16 kg) and a density of 0.870 g / ml, LLDPE copolymerized with ethylene and 1-hexene under a metallocene catalyst, density 0.918 g 44.8% by weight of metallocene polyethylene resin having a melt index of 1.0 g / 10min (190 DEG C. 2.16 kg), a melt index of 3.0 g / 10 min (190 DEG C. 2.16 kg), and a density of A copolymer of ethylene and 1-octene polymerized under a Ziegler-Natta catalyst having a weight of 0.923 g / ml, 30 wt% of a low density polyethylene resin, a melt index of 1.0 g / 10min (190 ° C. 2.16 kg) and a density of 0.918 g / ml. A polyolefin resin composition was prepared by thoroughly mixing 10 wt% of the polyethylene resin, 0.1 wt% of the silica-based blocking agent, and 0.1 wt% of the amide slip agent for 10-15 minutes in a Henschel mixer.

The resin composition was extruded with a film extruder under processing conditions of an extruder molding temperature extruder molding speed of 50 rpm to form a polyolefin reinforced film.

In the composition used in Example 1, except that 10 wt% of the elastomer resin, 49.8 wt% of the metallocene polyethylene resin, 25 wt% of the low density polyethylene resin and 15 wt% of the polyethylene resin consisting of a copolymer of ethylene and 1-octene Then, the polyolefin reinforcement film was formed in the same manner as in Example 1.

In the composition used in Example 1, 10% by weight elastomer resin, 49.8% by weight metallocene polyethylene resin, 25% by weight low density polyethylene resin, and 10% by weight polyethylene resin consisting of a copolymer of ethylene and 1-octene, coated Calcium carbonate (CaCO ₃ ) (coated calcium carbonate powder with Zn-St or Ca-St, having a size in the range of 1-2 microns) in the same manner as in Example 1, except that it was used at 5% by weight A polyolefin reinforced film was formed.

In the composition used in Example 1, 10 wt% of an elastomer resin, 49.8 wt% of a metallocene polyethylene resin, 25 wt% of a low density polyethylene resin, and 15 wt% of a polyethylene resin composed of a copolymer of ethylene and 1-octene were used. Except for forming a polyolefin reinforcement film in the same manner as in Example 1.

In the composition used in Example 1, a polyethylene resin (melt index 2.0, density of 10 wt% elastomer resin, 49.8 wt% metallocene polyethylene resin, 25 wt% low density polyethylene resin, and a copolymer of ethylene and 1-hexene) 0.920) A polyolefin-reinforced film was formed in the same manner as in Example 1, except that 10 wt% and 5 wt% of high density polyethylene (molding index 1.0, density 0.950 g / ml) were used.

Comparative Example 1

A polyolefin reinforcement film was formed in the same manner as in Example 1, except that only 29.8% by weight of the low density polyethylene resin and 70% by weight of the polyethylene resin composed of a copolymer of ethylene and 1-hexene were used.

Comparative Example 2

A polyolefin reinforcement film was formed in the same manner as in Comparative Example 1, except that only 29.8% by weight of the low density polyethylene resin and 70% by weight of the polyethylene resin composed of a copolymer of ethylene and 1-octene were used.

Comparative Example 3

Except 29.8% by weight low density polyethylene resin and 60% by weight polyethylene resin consisting of a copolymer of ethylene and 1-octene, 10% by weight of coated calcium carbonate (CaCO ₃ ) used in Example 3 was used. , Polyolefin reinforcement film was formed in the same manner as in Comparative Example 1.

Experimental Example 1

The polyolefin reinforcement films obtained in Examples 1 to 5 and Comparative Examples 1 to 3 were prepared with different thicknesses, and the physical properties thereof were evaluated by the following methods, and the results are shown in Tables 1 and 2 below. Indicated.

In the measurement of physical properties, the film thickness was the same as 50um, and the tensile strength: ASTM D882, tear strength: ASTM D1004, elongation: ASTM D882, transparency: D1003, impact strength D1709.

 Property measurement result Tensile Strength (kg / ㎠)  Tear strength (kg / cm) % Elongation transparency
(Haze) MD TD MD TD MD TD Example 1 308 341 101 63 505 930 5.7 Example 2 291 340 100 60 455 915 7.5 Example 3 322 315 107 68 435 900 7.5 Example 4 270 355 108 65 430 985 7.1 Example 5 296 307 110 66 400 905 8.2 Comparative Example 1 240 285 106 75 430 890 9.1 Comparative Example 2 266 305 122 63 405 815 8.9 Comparative Example 3 284 266 124 71 350 860 19.2

According to Table 1, it can be seen that the reinforcing films of Examples 1 to 5 are more excellent in physical properties such as tensile strength and elongation at the same thickness compared to the films of the comparative examples.

 Experimental Example 2

The impact strengths of the reinforcement films obtained in Examples 1 and 3 and the existing films prepared in Comparative Examples 1 and 3 were measured using a dart drop impact tester. At this time, the thickness of the applied film was equally 60um.

 As shown in Table 2, in the case of the polyolefin reinforcement film of the present invention it can be confirmed that the impact strength is significantly superior to the conventional film prepared in Comparative Examples 1 and 3.

 Property measurement result Example 1 Example 3 Comparative Example 1 Comparative Example 3 Impact strength 241 215 104 38

[Experimental Example 3]

The thickness of the applied film was prepared in the same manner and the heat-sealing the reinforcing films obtained in Examples 4 and 5 and the films prepared in Comparative Examples 1 and 2 were measured, and the sealing strength thereof was measured. The results are summarized in Table 3. (Time: 2 seconds, Pressure: 2 kgf / cm2)

Referring to Table 3, it was found that the products according to Examples 4 and 5 were superior in terms of strength than the products of Comparative Examples 1 and 2.

 The present invention described above is not limited to the above-described embodiment and the accompanying drawings, and various substitutions, modifications, and changes are possible within the scope without departing from the technical spirit of the present invention. It will be evident to those who have knowledge of.

Claims (10)

A) 7-20% by weight of elastomer resin; B) 40 to 60% by weight of metallocene polyethylene resin polymerized under a metallocene catalyst; C) 20 to 45 wt% low density polyethylene resin; D) 7 to 20% by weight polyethylene resin consisting of a copolymer of ethylene and 1-octene or ethylene and 1-hexene polymerized under a Ziegler-Natta catalyst; And E) 0.01 to 10% by weight of at least one additional component selected from the coated calcium carbonate, slip agent, neutralizing agent or blocking agent. The method according to claim 1,
D) The copolymer of ethylene and 1-octene is used as a component, The polyolefin resin composition for films characterized by the above-mentioned. The method according to claim 1,
The metallocene polyethylene resin is used by copolymerizing ethylene and 1-hexene or ethylene and 1-octene under a metallocene catalyst, 5 to 10 mol% of 1-hexene or 1-octene with respect to ethylene in the copolymer A polyolefin resin composition for a film, comprising a ratio of 0.915 g / ml to 0.925 g / ml, and a melt index of 0.5 to 2 g / 10 min (190 ° C. 2.16 kg). The method according to claim 1,
The copolymer of ethylene and 1-octene or ethylene and 1-hexene,
In the case of the 1-octene copolymer, the melt index is 0.5 to 2 g / 10min (190 ° C. 2.16 kg), the density ranges from 0.915 g / ml to 0.923 g / ml, and in the case of the 1-hexene copolymer A polyolefin resin composition for films, characterized in that the melt index is 1 to 3 g / 10 min (190 ° C. 2.16 kg) and the density is in the range of 0.915 g / ml to 0.925 g / ml. The method according to claim 1,
Elastomer resin is a polyolefin resin composition for a film, characterized in that the melt index is 0.5 to 2 g / 10min (190 ℃ 2.16kg) and the density is in the range of 0.865 g / ml to 0.875 g / ml. The method according to claim 1,
The low density polyethylene resin has a melt index of 1 to 7 g / 10 min (190 ° C. 2.16 kg) and a density of 0.920 g / ml to 0.925 g / ml. The method according to claim 4,
The blocking agent is a silica particle having an average particle size of 1 to 7 μm, a surface area of 50 to 100 m 2 / g, and the neutralizing agent is a stearate type, or zinc (Zn) stearate type or calcium (Ca) on calcium carbonate. A polyolefin resin composition for a film, characterized in that the stearate-based coating is used. The polyolefin industrial packaging reinforcement film formed from the polyolefin resin composition of any one of Claims 1-7. A) 7-20% by weight of elastomer resin; B) 40 to 60% by weight of metallocene polyethylene resin polymerized under a metallocene catalyst; C) 20 to 45 wt% low density polyethylene resin; And D) a silica-based blocking agent, an amide on a basic resin film in which 7 to 20% by weight of a polyethylene resin composed of a copolymer of ethylene and 1-octene or a copolymer of ethylene and 1-hexene polymerized under a Ziegler-Natta catalyst is uniformly blended. A reinforcing film formed of a polyolefin resin composition in which at least one additive component of a system slip agent and a coated calcium carbonate is dispersed in the base resin film. The method according to claim 9,
Reinforcing film consisting of 0,01 to 10% by weight of any one or more additive components of the silica-based blocking agent, amide slip agent and coated calcium carbonate based on the total film component