KR101934652B1 - Polypropylene Resin Composition and an Article Molded Therefrom - Google Patents

Abstract

The present invention relates to a polypropylene resin composition appropriate for a biaxially oriented mat film and an article molded therefrom and, more specifically, relates to a polypropylene resin composition appropriate for a biaxially oriented mat film with an ethylene propylene block copolymer and polyethylene and a biaxially oriented mat polypropylene film molded therefrom. According to the present invention, the biaxially oriented mat polypropylene film has low gloss, high haze, and excellent appearance characteristics.

Description

TECHNICAL FIELD [0001] The present invention relates to a polypropylene resin composition and a molded article produced from the same,

The present invention relates to a polypropylene resin composition suitable for a matte biaxially oriented film and a molded article produced therefrom. More particularly, the present invention relates to a polypropylene resin composition comprising an ethylene-propylene block copolymer and polyethylene and suitable for a biaxially stretched mat film and a biaxially oriented polypropylene film produced therefrom, The biaxially stretched mat polypropylene film produced by the present invention has a low gloss, high haze and excellent appearance.

Ethylene-propylene block copolymers have excellent physical and chemical properties and are widely used from extrusion such as film to injection fields such as automobile parts. In recent years, the ethylene-propylene block copolymer has been widely used as an injection molded article or a material for a lead-free film by realizing low gloss and high haze by controlling the composition and content of the ethylene-propylene copolymer of the rubber component. However, when the ethylene-propylene block copolymer is biaxially stretched, it is difficult to apply to a biaxially stretched mat film in which low gloss and high haze are required, because the gloss and the haze are lowered.

Biaxially stretched matte film featuring low gloss and high haze has the advantage of being able to realize paper texture or smooth texture, and is widely used for labeling, transferring and packaging requiring opacity depending on the application. Generally, two materials having different compatibility, flowability and melt index are used in combination. The larger the difference in compatibility, flowability and melt index, the lower the gloss and the higher the haze. However, when the difference is too large, the mat characteristic is excellent, but the blend is not good, the film is not uniform, and the fish eye is increased and the appearance defect easily occurs.

In this connection, in Korean Patent Application Publication No. 2014-0064511, low gloss is realized by increasing the intrinsic viscosity of an ethylene-propylene copolymer, which is one component of an ethylene-propylene block copolymer, and Korean Patent Application Publication No. 2016 -0091068 has achieved low gloss characteristics by maintaining the intrinsic viscosity ratio of homopolypropylene and ethylene-propylene copolymer constituting the ethylene-propylene block copolymer at a certain level. However, when these ethylene-propylene block copolymers are biaxially stretched, the gloss is increased, which is not suitable for use in a biaxially stretched mat film.

On the other hand, US Patent No. 6,783,848 discloses a resin composition for a mat film in which a propylene random copolymer resin and a polyethylene resin are blended. However, in the case of this resin composition, the compatibility of the propylene random copolymer resin with the polyethylene resin is low, so that fish eyes are easily generated and breakage easily occurs at the interface of the fish eye during biaxially stretching, Defects may occur and the film may not function properly as a matte film.

Korean Patent Application Publication No. 2014-0064511 (May 28, 2014) Korean Patent Application Publication No. 2016-0091068 (Aug. 2, 2016) U.S. Patent No. 6,783,848 (Aug. 31, 2004)

Accordingly, an object of the present invention is to provide a polypropylene resin composition suitable for producing a biaxially stretched mat film having low gloss and high haze characteristics and excellent appearance even after biaxial stretching processing.

Another object of the present invention is to provide a molded article produced from the above polypropylene resin composition, specifically a biaxially stretched mat polypropylene film.

According to one aspect of the present invention, there is provided a thermoplastic resin composition comprising (A) an ethylene-propylene block copolymer; And (B) polyethylene, wherein the content of the ethylene-propylene block copolymer (A) is 40 to 70% by weight based on the total weight of the components (A) and (B) B) is 30 to 60% by weight based on the total weight of the ethylene-propylene block copolymer, the ethylene-propylene block copolymer contains homopolypropylene and an ethylene-propylene copolymer of a rubber component, and the content of homopolypropylene The ethylene-propylene block copolymer having a content of 70 to 95% by weight and an ethylene-propylene copolymer content of 5 to 30% by weight and a melt viscosity of 7 to 30 g / 10 Lt; RTI ID = 0.0 >% < / RTI >

Preferably, the ethylene content in the ethylene-propylene copolymer of the rubber component is 25 to 75% by weight.

Preferably, the polyethylene is at least one selected from the group consisting of low density polyethylene, high density polyethylene and linear low density polyethylene.

More preferably, the polyethylene is high density polyethylene.

Preferably, the melt index of the polyethylene measured at 190 占 폚 at a load of 2.16 kg is 0.1 to 8 g / 10 min.

Preferably, the polypropylene resin composition further comprises 0.005 to 0.3 parts by weight of an organic peroxide per 100 parts by weight of the polypropylene resin composition.

Preferably, the organic peroxide is selected from the group consisting of diethyl peroxydicarbonate, dipropyl peroxydicarbonate, isopropyl dicarbonate, dibutyl peroxydicarbonate, diethylhexyl peroxydicarbonate, dioctyl peroxydicarbonate, di-tertiary-butylcyclo Hexyl peroxydicarbonate, dimyryl peroxydicarbonate, and dicetyl peroxydicarbonate.

Preferably, the polypropylene resin composition contains at least one additive selected from the group consisting of antioxidants, catalyst neutralizers, heat stabilizers, reinforcing materials, fillers, weather stabilizers, antistatic agents, lubricants, slip agents, nucleating agents, flame retardants, pigments and dyes .

According to another aspect of the present invention, there is provided a molded article produced by molding the above polypropylene resin composition.

More preferably, the molding includes film casting and biaxial stretching.

More preferably, the molded article is a biaxially stretched mat polypropylene film.

More preferably, the film is formed into a two-layer film composed of a resin layer and a mat layer during casting.

More preferably, the resin layer comprises at least one resin selected from the group consisting of homopolypropylene, random polypropylene, block polypropylene and polyethylene.

More preferably, the resin layer has a melt index of 0.5 to 10 g / 10 min as measured at 190 占 폚 under homopolypropylene or 2.16 kg load with a melt index of 1.5 to 10 g / 10 min measured at 230 占 폚 under a load of 2.16 kg Polyethylene resin.

More preferably, the mat layer comprises the polypropylene resin composition of the present invention.

More preferably, the thickness of the resin layer is 500 to 900 占 퐉, the thickness of the mat layer is 50 to 150 占 퐉, and the total thickness of the two-layer film is 550 to 1,050 占 퐉.

More preferably, the biaxial stretching is carried out at a temperature in the range of 100 to 180 占 폚 in the machine direction by 4 to 8 times and in the transverse direction by 6 to 12 times.

More preferably, the biaxially stretched mat polypropylene film has a gloss of 20% or less and a haze of 55% or more.

The polypropylene resin composition suitable for the biaxially stretched mat film according to the present invention has low gloss and high haze characteristics and is excellent in dispersibility and thus can be effectively applied to biaxially stretched mat films and the like due to suppressed appearance defects.

Hereinafter, the present invention will be described in more detail.

A polypropylene resin composition according to an embodiment of the present invention comprises (A) 40 to 70% by weight of an ethylene-propylene block copolymer; And (B) 30 to 60% by weight of polyethylene, wherein the ethylene-propylene block copolymer comprises a homopolypropylene and an ethylene-propylene copolymer of a rubber component, wherein the ethylene- Propylene block copolymer having a propylene content of 70 to 95% by weight, an ethylene-propylene copolymer content of 5 to 30% by weight and a load of 2.16 kg at 230 DEG C of 3 to 30 g / 10 minutes.

(A) an ethylene-propylene block copolymer

The ethylene-propylene block copolymer, which is one component of the polypropylene resin composition of the present invention, includes homopolypropylene and an ethylene-propylene copolymer of a rubber component.

The content of homopolypropylene based on the total weight of the ethylene-propylene block copolymer is 70 to 95% by weight and the content of the rubber component ethylene-propylene copolymer measured by solvent extraction (extracted at 135 DEG C with a xylene solvent) The content is 5 to 30% by weight. If the content of the ethylene-propylene copolymer is less than 5% by weight, the dispersibility of the polyethylene (B) may be poor, resulting in appearance defects such as fish eyes and silver spots. On the other hand, if the content of the rubber component ethylene-propylene copolymer is higher than 30% by weight, it may not be suitable for a matte film because of high gloss or low haze.

The ethylene-propylene block copolymer has a melt index of 3 to 30 g / 10 min, preferably 7 to 25 g / 10 min, measured at 230 ° C under a load of 2.16 kg according to ASTM D1238. When the melt index is less than 3 g / 10 min, the extrusion load during film processing is high, resulting in poor processability. When the melt index is more than 30 g / 10 min, the melt strength is low, The difference in flowability with polyethylene is so large that mixing can not be performed well and appearance defects such as fish eyes may occur.

On the other hand, the ethylene content of the rubber component ethylene-propylene copolymer constituting the ethylene-propylene block copolymer is preferably 25 to 75% by weight. When the ethylene content in the ethylene-propylene copolymer is lower than 25% by weight or higher than 75% by weight, the dispersibility of the polyethylene (B) is poor, resulting in appearance defects such as fish eyes and silver spots, It may not be suitable for a matte film because it is high or low in haze.

The content of the ethylene-propylene block copolymer in the polypropylene resin composition of the present invention is 40 to 70% by weight, preferably 40 to 60% by weight. When the content of the ethylene-propylene block copolymer is less than 40% by weight, thermal stability of the resin composition deteriorates, film processing is difficult, the degree of gloss is high or the haze is low, which is not suitable for a matte film, When the content of the copolymer exceeds 70% by weight, the content of polyethylene is low, resulting in high gloss or low haze.

There is no particular limitation on the method for producing the ethylene-propylene block copolymer of the present invention, and the production method of the ethylene-propylene block copolymer known in the technical field of the present invention can be used as it is or modified appropriately.

Preferably, by using a Hypol process, in which two bulk reactors and two vapor phase reactors are connected in series and can be continuously polymerized, the ethylene-propylene block Copolymers can be prepared.

Specifically, a homopolypropylene is prepared in the presence of a catalyst by feeding propylene to a bulk reactor, ethylene and propylene are fed in the presence of the homopolypropylene and a catalyst in a subsequent gas phase reactor to add an ethylene-propylene copolymer of a rubber component To obtain an ethylene-propylene block copolymer (A).

In the above polymerization step, a catalyst known in the art may be used without limitation, but a catalyst prepared by reacting a titanium compound and a phthalate internal electron donor with a dialkoxymagnesium carrier may be used. And an external electron donor.

(B) Polyethylene

As the other component constituting the polypropylene resin composition of the present invention, polyethylene is preferably at least one selected from low-density polyethylene, high-density polyethylene and linear low-density polyethylene, more preferably high-density polyethylene.

The polyethylene may have a melt index of 0.1 to 8 g / 10 min, preferably 0.1 to 1 g / 10 min, measured at 190 占 폚 under a load of 2.16 kg according to ASTM D1238. If the melt index is less than 0.1 g / 10 min, the processability during film processing may deteriorate or the appearance may be deteriorated due to an increase in fish eye. On the other hand, when the melt index exceeds 8 g / 10 min, And is not suitable for biaxially stretched matte films because of high gloss or low haze when blended.

The content of styrene in the polypropylene resin composition of the present invention is 30 to 60% by weight, preferably 40 to 60% by weight. When the content of polyethylene is less than 30 wt% or exceeds 60 wt%, the gloss is high or the haze is low, which is not suitable for use in a matte film.

There is no particular limitation on the method for producing the polyethylene, and the method for producing polyethylene known in the technical field of the present invention can be used as it is or modified appropriately. Preferably, the polyethylene can be produced by a polymerization method known to a person skilled in the art using a gas phase process or a slurry process.

Specifically, polyethylene can be obtained by feeding ethylene to the reactor and polymerizing in the presence of a chromium-based or Ziegler-Natta catalyst.

Meanwhile, the polypropylene resin composition according to the present invention may contain 0.005 to 0.3 parts by weight, preferably 0.01 to 0.1 part by weight per 100 parts by weight of the polypropylene resin composition in order to further lower the gloss or further increase the haze, organic peroxide. The organic peroxide reacts with the ethylene-propylene block copolymer to cause beta scission to increase the melt index, while reacting with polyethylene to cause a cross-linking reaction, thereby lowering the melt index. Therefore, the difference between the melt index and the flowability of the ethylene-propylene block copolymer and the polyethylene is increased, and the effect of increasing the glossiness can be caused. If the content of the organic peroxide is less than 0.005 parts by weight, sufficient reaction does not occur to cause a change in the melt index. If the content of the organic peroxide is more than 0.3 parts by weight, it becomes difficult to control the reaction.

The organic peroxide may be selected from the group consisting of diethyl peroxydicarbonate, dipropyl peroxydicarbonate, isopropyl dicarbonate, dibutyl peroxydicarbonate, diethylhexyl peroxydicarbonate, dioctyl peroxydicarbonate, di-tertiary-butylcyclohexyl peroxydicarbonate , Di-methyl peroxydicarbonate, and dicetyl peroxydicarbonate.

The polypropylene resin composition according to the present invention may further contain conventional additives within the scope of the present invention. For example, the polypropylene resin composition may contain an antioxidant, a catalyst neutralizer, a heat stabilizer, a reinforcing material, a filler, , Lubricants, slip agents, nucleating agents, flame retardants, pigments, dyes, and the like, but are not particularly limited thereto.

For example, antioxidants include tetrakis (methylene (3,5-di-t-butyl-4-hydroxy) hydrosilylate), 1,3,5-trimethyl-tris (3,5- Butyl-4-hydroxybenzene), and phosphite-based antioxidants such as tris (2,4-di-t-butylphenol) phosphite and the like, but are not limited thereto It is not.

The catalyst neutralizing agent serves to neutralize the catalyst used in the synthesis of the polymer when it remains as a residue, and such a catalyst neutralizing agent can be used without limitation as long as it is a catalyst neutralizing agent used in the technical field of the present invention. Preferably, calcium stearate, hydrotalcite and the like can be used.

There is no particular limitation on the method for producing the polypropylene resin composition of the present invention, and the method for producing the polypropylene resin composition known in the technical field of the present invention can be used as it is or modified as appropriate, They can be freely selected and mixed according to the desired order without any restriction.

Specifically, for example, the above-mentioned resins and additives are added to a kneader or a single screw / twin screw extruder such as a kneader, a roll, a Banbury mixer, etc., The polypropylene resin composition of the present invention can be prepared by blending the charged raw materials using equipment.

According to another aspect of the present invention, there is provided a molded article produced by molding the polypropylene resin composition of the present invention. There is no particular limitation on the method for producing the molded article from the polypropylene resin composition of the present invention, and a method known in the technical field of the present invention can be used.

Preferably, the polypropylene resin composition of the present invention is cast into a film and biaxially stretched to produce a biaxially stretched mat polypropylene film. There is no particular limitation on the method for producing the biaxially stretched mat polypropylene film from the polypropylene resin composition of the present invention, and a method known in the technical field of the present invention can be used.

Specifically, the polypropylene resin composition of the present invention is melt-blended at 200 to 250 ° C in a twin screw extruder and pelletized. Subsequently, a two-step film process can be carried out. In the first step, the film is formed into a two-layer film having a thickness of 550 to 1,050 mu m in the film-forming apparatus. In the second step, the biaxial stretching film can be processed into a biaxially stretched film.

In the first step, the film forming step, the two-layer film may consist of a resin layer and a mat layer. Preferably, the resin layer comprises at least one resin selected from the group consisting of homopolypropylene, random polypropylene, block polypropylene and polyethylene. Such homopolypropylene, random polypropylene, block polypropylene and polyethylene resin are not particularly limited. More preferably, the resin layer comprises a homopolypropylene having a melt index of 1.5 to 10 measured at 230 DEG C under a load of 2.16 kg or a polyethylene resin having a melt index of 0.5 to 10 measured at 190 DEG C under a load of 2.16 kg. On the other hand, a pelletized polypropylene resin composition of the present invention is used for the mat layer.

At this time, the thicknesses of the resin layer and the matte layer may be in the range of 500 to 900 占 퐉 and 50 to 150 占 퐉, respectively.

The second step, biaxial stretching, can be processed into a biaxially stretched film by stretching 4 to 8 times in the machine direction and 6 to 12 times in the transverse direction at a temperature range of 100 to 180 占 폚.

Preferably, the biaxially stretched mat polypropylene film produced from the polypropylene resin composition of the present invention has a luster of 20% or less and a haze of 55% or more.

[Example]

Hereinafter, the present invention will be described more specifically with reference to examples and comparative examples. However, the following examples are for illustrative purposes only and are not intended to limit the scope of the present invention.

The film properties in the respective Examples and Comparative Examples were measured by the following methods.

(1) Melt index

The melt index of polypropylene was measured at 230 DEG C under a load of 2.16 kg according to ASTM D1238, and the melt index of polyethylene was measured at 190 DEG C under a load of 2.16 kg.

(2) Content of xylene solvent extract

Approximately 4 g of the sample was weighed and the precise weight (a) was measured. The solution was dissolved in 150 ml of xylene solvent at 135 ° C. 50 ml of the solution was taken and dried at 105 ° C for 1 hour to measure the remaining weight (b) , And the content of the xylene solvent extract was calculated using the following equation (1).

[Equation 1]

Content (%) of xylene solvent extract = ((b x 3) / a) x 100

(3) Haze (haze,%)

The haze was measured according to the ASTM D 1003 method.

(4) Glossiness (%)

The amount of reflected light was measured at an angle of 60 [deg.] According to the ASTM D523 method.

(5) Appearance characteristics

Appearance characteristics were evaluated by measuring the number of silver spots in a film of a size of 0.4 m × 0.5 m and evaluating that the number of silver spots is less than 3, and when it is more than 3, it is defective. The silver spot was measured by counting the number of shining parts while the incandescent lamp was placed inside the film and the light was not scattered uniformly but leaking out.

Resins used in the following examples and comparative examples are as follows. The resins described below were prepared by methods well known in the art to which the present invention belongs, as described above.

Ethylene-propylene block copolymer A1: melt index (230, 2.16 kg) 15 g / 10 min, Tm: 163 DEG C

Ethylene-propylene block copolymer A2: melt index (230, 2.16 kg) 35 g / 10 min, Tm: 163 DEG C

Ethylene-propylene block copolymer A3: melt index (230, 2.16 kg) 2.5 g / 10 min, Tm: 163 DEG C

Homopolypropylene A4: melt index (230, 2.16 kg) 2.5 g / 10 min, Tm: 163 DEG C

High density polyethylene B1: melt index (190, 2.16 kg) 0.25 g / 10 min, Tm: 130 DEG C

High density polyethylene B2: melt index (190, 2.16 kg) 5 g / 10 min, Tm: 130 DEG C

Example  And Comparative Example

The compositions of the resin types and contents as shown in Table 1 below were melt-blended at 220 캜 in a twin screw extruder and pelletized. The film processing was carried out in two stages, the first stage being a two-layer film with a thickness of 400 μm on the casting film machine and the biaxially stretched film on a biaxial stretcher machine in the second stage.

In the first step, a two-layer film having a thickness of 400 占 퐉, the composition of the two layers was resin layer / mat layer = 350 占 퐉 / 50 占 퐉 and the resin layer had homopoly Propylene (Tm: 163 占 폚) was used as the base material, and the mat layer was formed into a pelletized composition by melt-blending according to the compositions of Examples 1 to 3 and Comparative Examples 1 to 5 shown in Table 1 below.

The second step, biaxial stretching, was stretched by 5 times in the machine direction and 7 times in the transverse direction at 150 DEG C and processed into a biaxially stretched film.

The molded film was examined for haze, gloss, and appearance, and the results of the respective tests are shown in Table 2 below.

Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Comparative Example 6 Type and content (% by weight) of polypropylene (A) A1 A1 A1 A2 A3 A1 A1 A1 A4 60 50 40 50 50 50 80 30 50 Type and content (% by weight) of polyethylene (B) B1 B1 B1 B1 B1 B1 B1 B1 B2 40 50 60 50 50 50 20 70 50 Rubber component Ethylene-propylene copolymer content (% by weight) 12 12 12 12 12 35 12 12 - Rubber component Ethylene content in ethylene-propylene copolymer (% by weight) 55 56 55 55 54 56 52 56 -

Biaxially stretched film properties Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Comparative Example 6 Haze (%) 61 67 57 48 27 21 28 29 54 Glossiness (%) 18 16 19 16 37 24 42 31 17 Appearance characteristic Good Good Good Bad Good Bad Good Good Bad

As can be seen from the above Table 2, Examples 1 to 3 show that the biaxially stretched film has an excellent matte property with a haze of 55% or more and a glossiness of 20% or less.

On the other hand, when the melt index of the ethylene-propylene block copolymer is higher than that of the present invention as in Comparative Example 1, the appearance characteristics of the film are not good, and the melt index of the ethylene- If it is lower than the range, the haze is less than 30% and the gloss is more than 35%.

When the ethylene-propylene copolymer content of the ethylene-propylene block copolymer exceeds 30% by weight based on the content of the xylene solvent extract as in Comparative Example 3, the appearance of the film is poor, the haze is high, and the glossiness is low.

When Examples 1 and 3 and Comparative Examples 4 and 5 are compared, when the content of the high density polyethylene is out of the range of the present invention, the haze is as low as 30% or less and the gloss is as high as 30% or more, Not suitable for demanding matte film applications.

When using homopolypropylene which does not contain an ethylene-propylene copolymer as a rubber component as in Comparative Example 6, the appearance characteristics are poor and a problem may arise in quality.

Therefore, the film produced from the polypropylene resin composition for a biaxially stretched mat film according to the embodiment of the present invention satisfies not only high haze and roughness but also excellent appearance properties of the film, so that it can be used for labeling, Can be effectively used as a matte film of the present invention.

Claims (18)

(A) an ethylene-propylene block copolymer; And (B) polyethylene, wherein the content of the ethylene-propylene block copolymer (A) is 40 to 70% by weight based on the total weight of the components (A) and (B) B) is 30 to 60% by weight based on the total weight of the ethylene-propylene block copolymer, the ethylene-propylene block copolymer contains homopolypropylene and an ethylene-propylene copolymer of a rubber component, and the content of homopolypropylene The ethylene-propylene block copolymer having a content of 70 to 95% by weight, an ethylene-propylene copolymer content of 5 to 30% by weight and a melt viscosity of 7 to 30 g / 10 minutes, and a melt index of polyethylene measured at 190 占 폚 under a load of 2.16 kg is 0.1 to 1 g / 10 minutes. The polypropylene resin composition according to claim 1, wherein the ethylene content in the ethylene-propylene copolymer of the rubber component is 25 to 75% by weight. The polypropylene resin composition according to claim 1, wherein the polyethylene is at least one selected from the group consisting of low density polyethylene, high density polyethylene and linear low density polyethylene. The polypropylene resin composition according to claim 3, wherein the polyethylene is high-density polyethylene. delete The polypropylene resin composition according to claim 1, further comprising 0.005 to 0.3 parts by weight of an organic peroxide per 100 parts by weight of the polypropylene resin composition. The process according to claim 6, wherein the organic peroxide is selected from the group consisting of diethyl peroxydicarbonate, dipropyl peroxydicarbonate, isopropyl dicarbonate, dibutyl peroxydicarbonate, diethylhexyl peroxydicarbonate, dioctyl peroxydicarbonate, Butyl cyclohexyl peroxydicarbonate, dimyryl peroxydicarbonate, and dicetyl peroxydicarbonate. The polypropylene resin composition according to claim 1, The method according to claim 1, further comprising at least one additive selected from the group consisting of antioxidants, catalyst neutralizers, heat stabilizers, reinforcing materials, fillers, weather stabilizers, antistatic agents, lubricants, slip agents, nucleating agents, flame retardants, pigments and dyes ≪ / RTI > A molded article produced by molding the polypropylene resin composition according to any one of claims 1 to 4 and 6 to 8. 10. A shaped article according to claim 9, wherein the molding comprises film casting and biaxial stretching. 11. A molded article according to claim 10, which is a biaxially stretched mat polypropylene film. 11. A molded article according to claim 10, wherein the film is formed into a two-layer film composed of a resin layer and a mat layer during casting. The molded article according to claim 12, wherein the resin layer comprises at least one resin selected from the group consisting of homopolypropylene, random polypropylene, block polypropylene and polyethylene. 14. The resin composition according to claim 13, wherein the resin layer has a melt index of 0.5 to 10 g / 10 minutes measured at 190 DEG C under a load of 2.16 kg and a homopolypropylene having a melt index of 1.5 to 10 g / 10 min measured at 230 DEG C or a load of 2.16 kg A molded article comprising a polyethylene resin. 13. A molded article according to claim 12, wherein the mat layer comprises a polypropylene resin composition. The molded article according to claim 12, wherein the thickness of the resin layer is 500 to 900 탆, the thickness of the mat layer is 50 to 150 탆, and the total thickness of the two-layer film is 550 to 1,050 탆. 11. A molded article according to claim 10, wherein the biaxial stretching is performed in a machine direction at a temperature of 100 to 180 DEG C by 4 to 8 times and in a transverse direction by 6 to 12 times. 12. A molded article according to claim 11, which is a biaxially stretched mat polypropylene film having a luster of 20% or less and a haze of 55% or more.