KR20160056526A - Adhesive polypropylene resin composition applicable to multi layer film for packaging food - Google Patents

Abstract

The present invention relates to an adhesive resin composition for a multilayer film. Disclosed is an adhesive resin composition having excellent adhesive strength, which is applied to a multilayer film stacked body composed of polyolefin and, particularly, polyethylene/polypropylene. The adhesive resin composition comprises: 20 to 60 wt% of a polypropylene resin; 20 to 60 wt% of a polyethylene resin modified with dicarboxylic acid or acid anhydride thereof; 1 to 20 wt% of a polypropylene resin modified with dicarboxylic acid or acid anhydride thereof; 2 to 30 wt% of an olefin block copolymer; 1 to 10 wt% of a tackifier; and 0.05 to 1 wt% of an antioxidant.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an adhesive resin composition for a multilayer film,

The present invention relates to an adhesive resin composition for a multilayer film, and more particularly, to an adhesive resin composition for improving a peeling phenomenon by improving interlayer adhesive force in the production of a film having a multilayer structure of polyethylene / polypropylene.

The multilayer film means a composite film in which films of different kinds are laminated for the purpose of making the polymer resin film multifunctional. For example, a multilayer film that combines excellent mechanical properties of polyethylene and print smoothness of cellophane, or a multilayer film of nylon and vinyl alcohol-ethylene copolymer or the like is used as a packaging material.

A variety of adhesive components are known for bonding various polymer resins, metal layers such as aluminum, etc., applied to such multilayer films. However, the previously known adhesive components for a multilayered film have problems such as insufficient adhesion, low air and moisture barrier properties or mechanical properties, low flexibility or elasticity, low adhesive strength due to repeated deformation, And the like. In recent years, multilayer films have been produced by a co-extrusion method. If the adhesive component is not sufficiently flexible or elastic, a uniform adhesive layer can not be formed during the co-extrusion process, or sufficient adhesion or mechanical properties can not be secured Respectively.

On the other hand, in the field of film applications in which the properties of polyethylene and polypropylene are required at the same time, a multilayer film in which polyethylene and polypropylene are co-extruded is produced. However, since the polyethylene and polypropylene layers have low compatibility with each other due to their low compatibility with each other and the cohesion after co-extrusion is problematic, the cohesion is lower than the co-extrusion method, but the adhesion by dry lamination It is coming.

There has been reported a technique of increasing the adhesion between the polyethylene / polypropylene multilayer films by adding a certain amount of high-density polyethylene to each of the low-density polyethylene and the polypropylene, but a process of blending the high-density polyethylene before the introduction of the raw material is required, The high-density polyethylene can be damaged by the added high-density polyethylene.

Korean Patent Laid-Open Publication No. 2013-0137155 discloses a technique of increasing the adhesive strength by inserting a certain amount of high-density polyethylene into each of the polyethylene / polypropylene multilayer films in order to increase interlaminar adhesion. This patent relates to the direct adhesion between polyethylene / polypropylene layers without a tie layer, and for economical reasons, the use of an adhesive layer is eliminated, but the manufacture of a polyethylene / polypropylene multilayer film using an adhesive layer is still required to be.

Korean Patent Laid-Open Publication No. 2010-0025270 discloses a resin composition excellent in heat sealing performance by adding polypropylene to a polyethylene coating such as a ramen container. In particular, regarding application to a polyethylene / polypropylene multilayer film It is not mentioned.

U.S. Patent No. 5,250,349 discloses an adhesive resin composition comprising an ethylene / vinyl acetate copolymer, a styrene, a carboxylic acid modified polyethylene, a polystyrene elastomer, and a copolymer of ethylene / alpha-olefin. Such an adhesive resin composition exhibits a high adhesive strength to a thermoplastic resin and a metal, and has a characteristic that the adhesive strength is not lowered even when heated at a high temperature. However, the adhesive resin composition of this patent is applied to a multilayer film, and thus has sufficient flexibility and elasticity, or has a limitation in exhibiting high moldability in a manufacturing process.

An adhesive resin composition for a multilayer film is intended to provide an adhesive resin composition excellent in adhesion, which is applied to a multilayer film laminate made of a polyolefin, particularly polyethylene / polypropylene.

In order to solve the above problems, the present invention provides a polypropylene resin composition comprising 20 to 60% by weight of a polypropylene resin; 20 to 60% by weight of a polyethylene resin modified with a dicarboxylic acid or an acid anhydride thereof; 1 to 20% by weight of a polypropylene resin modified with a dicarboxylic acid or an acid anhydride thereof; 2 to 30% by weight of an olefin block copolymer; Tackifier 1 to 10% by weight; And 0.05 to 1% by weight of an antioxidant. The present invention also provides an adhesive resin composition for a multilayer film.

Wherein the polypropylene resin is at least one selected from the group consisting of a propylene / ethylene random copolymer, a propylene / ethylene block copolymer, and an ethylene / propylene / alpha-olefin terpolymer. to provide.

The propylene / ethylene random copolymer has a density of 0.89 to 0.92 g / cm 3, a melt flow rate (MFR, 230 ° C, 2.16 kg load) of 0.5 to 10 g / 10 min and an ethylene content of 2 to 3.5 wt% An adhesive resin composition for a multilayer film is provided.

The polyethylene resin was prepared using a Ziegler-Natta catalyst having a density of 0.86 to 0.95 g / cm 3, a melt flow rate (MFR, 190 캜, 2.16 kg load) of 1 to 9 g / 10 min and a graft rate of 0.1 to 3 wt% The present invention also provides an adhesive resin composition for a multilayer film.

And the polypropylene resin has a graft ratio of 0.5 to 10% by weight and a weight average molecular weight of 1,000 to 100,000.

The olefin block copolymer may be at least one selected from the group consisting of a propylene / ethylene block copolymer, an ethylene / octene block copolymer, an ethylene / butene block copolymer, and an ethylene / An adhesive resin composition for a multilayer film is provided.

The tackifier may be selected from the group consisting of aromatic petroleum resins, aliphatic petroleum resins, petroleum resins, hydrogenated petroleum resins, rosin acid, rosin esters, hydrogenated rosin resins, coumarone resins, terpene resins, And an adhesive resin composition for a multilayer film, wherein the adhesive resin composition is at least one selected from the group consisting of

The present invention also provides an adhesive resin composition for a multilayer film, wherein the antioxidant is a phenol-based primary antioxidant or a phosphate-based secondary antioxidant.

The adhesive resin composition for a multilayer film is characterized in that the resin composition has a peel strength of 1 kgf / 15 mm or more as measured by the following method.

[Measurement method of peel strength]

Layer film (PE / tie-resin / PP) as an adhesive layer resin (tie-resin) between polyethylene and polypropylene using a multilayer film molding machine (line speed 5 m / min) , The peel strength is measured when the peel speed of 300 mm / min is applied based on ASTM D882.

According to the present invention, when the polypropylene resin, the modified polyethylene resin, the modified polypropylene resin, the olefin block copolymer, the tackifier and the antioxidant are contained in an optimum range, It is possible to provide a multilayer film adhesive resin composition which exhibits excellent film properties such as excellent adhesion performance, appropriate flexibility and impact resistance.

Figs. 1 to 4 are photographs showing films produced according to Examples 1 to 4 used in peel evaluation in the experimental examples of the present invention, respectively. Fig.

Hereinafter, preferred embodiments of the present invention will be described in detail. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. Throughout the specification, when an element is referred to as "including " an element, it means that it can include other elements, not excluding other elements, unless specifically stated otherwise.

The present inventors have conducted intensive studies on an adhesive resin composition for a multilayer film having excellent interlayer adhesion between polyethylene and polypropylene as an adhesive layer material applied to a multilayer film laminate made of a polyolefin, particularly a polyethylene / polypropylene. As a result, It has been found that the best film properties such as excellent adhesion performance and appropriate flexibility and impact resistance are exhibited by including the resin, the modified polyethylene resin, the modified polypropylene resin, the olefin block copolymer, the tackifier and the antioxidant in an optimum range And led to the present invention.

Accordingly, the present invention relates to a polypropylene resin composition comprising 20 to 60% by weight of a polypropylene resin; 20 to 60% by weight of a polyethylene resin modified with a dicarboxylic acid or an acid anhydride thereof; 1 to 20% by weight of a polypropylene resin modified with a dicarboxylic acid or an acid anhydride thereof; 2 to 30% by weight of an olefin block copolymer; Tackifier 1 to 10% by weight; And 0.05 to 1% by weight of an antioxidant.

In the present invention, the polypropylene resin is not particularly limited, but it can be preferably used in the form of a copolymer such as a propylene / ethylene random copolymer, a propylene / ethylene block copolymer, an ethylene / propylene / alpha-olefin terpolymer, Preferably, a propylene / ethylene random copolymer may be used.

Such a polypropylene resin may be contained in an amount of 20 to 60% by weight, preferably 35 to 50% by weight based on the total resin composition in consideration of the adhesive strength between the substrate of the adhesive layer, particularly polyethylene and the polypropylene base.

When a propylene / ethylene random copolymer is used as the polypropylene resin, the density is 0.89 to 0.92 g / cm 3, the melt flow rate (MFR, 230 ° C, 2.16 kg load) is 0.5 to 10 g / 10 min, By weight and 3.5% by weight.

The modified polyethylene resin in the present invention refers to a polymer which introduces polarity into a non-polar linear low density polyethylene main chain, and is a polymer in which a dicarboxylic acid or an acid anhydride thereof is grafted to form a branched chain. Such a modified polyethylene resin in which the dicarboxylic acid or an acid anhydride thereof is grafted can further improve the compatibility between the polypropylene resin and a tackifier described later, and the adhesive composition can have a homogeneous composition and distribution . The modified polyethylene resin in which the dicarboxylic acid or an acid anhydride thereof is grafted can also improve adhesion of the adhesive resin composition for a multilayer film.

The dicarboxylic acid may be selected from the group consisting of maleic acid, phthalic acid, itaconic acid, citraconic acid, alkenylsuccinic acid, cis-1,2,3,6-tetrahydrophthalic acid, 4-methyl-1,2,3,6-tetrahydrophthalic acid or And a mixture of two or more thereof. The dianhydride of the dicarboxylic acid may be a dicarboxylic dianhydride of the above-mentioned examples.

The modified polyethylene resin preferably comprises 20 to 60% by weight of a linear low density polyethylene resin, 30 to 70% by weight of an elastomer, 0.1 to 10% by weight of a dicarboxylic acid or an acid anhydride thereof and 0.01 to 1% by weight of a peroxide initiator And more preferably from 35 to 50% by weight of a linear low density polyethylene resin, from 49 to 64% by weight of an elastomer, from 0.5 to 2% by weight of a dicarboxylic acid or an acid anhydride thereof and from 0.02 to 0.05% by weight of a peroxide initiator .

The modified linear low density polyethylene resin has a density of 0.86 to 0.95 g / cm 3, a melt flow rate (MFR, 190 캜, 2.16 kg load) of 1 to 9 g / 10 min, a graft rate of 0.1 to 3 wt% and a weight average molecular weight (Mw) Is in the range of 50,000 to 1,000,000, it is suitable for improving the adhesion between the polyethylene and the polypropylene substrate.

If the graft ratio of the modified linear low density polyethylene resin is less than 0.1% by weight, the compatibility of the adhesive resin composition and the uniformity of the composition may be deteriorated. If the graft ratio is more than 3% by weight, Physical properties or flexibility may be deteriorated.

The graft ratio of the dicarboxylic acid or its acid anhydride can be determined from the results obtained by acid-base titration of the modified linear low density polyethylene resin. For example, about 1 g of the modified linear low density polyethylene resin is placed in 150 ml of xylene saturated with water and refluxed for about 2 hours. A small amount of a 1% by weight thymol blue-dimethylformamide solution is added, and 0.05 N sodium hydroxide-ethyl alcohol The solution was again slightly titrated with a solution to obtain a dark blue solution. The solution was again back-adjusted with a 0.05N hydrochloric acid-isopropyl alcohol solution until it showed yellow color, and the acid value was determined. The acid value was grafted on the modified linear low density polyethylene resin The amount of dicarboxylic acid can be calculated.

The elastomer may react with the linear low density polyethylene resin to increase the physical properties of the modified linear low density polyethylene resin and also to impart initial adhesion performance to the adhesive resin composition for the final multilayer film.

Examples of such an elastomer include ethylene-octene rubber, ethylene-butadiene rubber, ethylene-propylene rubber and ethylene / 1-butene random copolymer. Ethylene-octene rubber is preferably used. Of the weight average molecular weight

And may have a density of 0.84 to 0.89 g / cm 3.

The peroxide initiator is a compound capable of forming a radical in the linear low density polyethylene resin and allowing the polyolefin to undergo a graft reaction such as maleic anhydride. Any initiator that can be commonly used for polymerization or copolymerization reaction can be used without limitation . For example, hydrogen peroxide, ketone peroxide, methyl ethyl ketone peroxide, cyclohexanone peroxide, methyl isobutyl ketone peroxide, diacyl peroxide, lauroyl peroxide, isobutyryl peroxide, acetyl peroxide, 2,4-dichlorobenzoyl peroxide, 2,5-dimethyl-2,5-di (t-butylperoxy) hexane (DTBPH, 2,5-dimethyl- 2,5-di (t-butylperoxy) hexane) or dicumyl peroxide may be used.

If the content of the peroxide initiator is less than 0.01% by weight in the modified linear low density polyethylene resin, sufficient graft reaction with the linear low density polyethylene resin and maleic anhydride may be difficult to achieve. It is preferable to keep the weight percentages or less.

Such modified linear low density polyethylene resin may be contained in an amount of 20 to 60% by weight, preferably 25 to 50% by weight based on the total resin composition in consideration of the adhesive strength between the base material of the adhesive layer, particularly polyethylene and the polypropylene base material.

The modified polypropylene resin in the present invention may be prepared by reactive extrusion or solution method, as in the case of the modified polyethylene resin, by polymerizing a dicarboxylic acid or an acid anhydride thereof to form a branched chain.

The dicarboxylic acid may be selected from the group consisting of maleic acid, phthalic acid, itaconic acid, citraconic acid, alkenylsuccinic acid, cis-1,2,3,6-tetrahydrophthalic acid, 4-methyl-1,2,3,6-tetrahydrophthalic acid or And a mixture of two or more thereof. The dianhydride of the dicarboxylic acid may be a dicarboxylic dianhydride of the above-mentioned examples. The peroxide initiator is a compound capable of forming a radical in the polypropylene resin and allowing the polyolefin to undergo a graft reaction such as maleic anhydride. Any initiator that can be commonly used in the polymerization or copolymerization reaction can be used without limitation , Preferably 2,5-dimethyl-2,5-di (t-butylperoxy) hexane (DTBPH, 2,5-dimethyl- dicumyl peroxide may be used.

The modified polypropylene resin may preferably be composed of a resin composition containing at least 80% by weight of a polypropylene resin, 0.02 to 1% by weight of a peroxide initiator, and 0.7 to 20% by weight of maleic anhydride or a derivative thereof. To 3% by weight and a weight average molecular weight (Mw) of 1,000 to 100,000 are suitable for improving adhesion between polyethylene and a polypropylene substrate.

Such a modified polypropylene resin may be contained in an amount of 1 to 20% by weight, preferably 5 to 10% by weight based on the total resin composition in consideration of the adhesive strength between the substrate of the adhesive layer, particularly polyethylene and the polypropylene base.

In the present invention, the olefin block copolymer is used for improving compatibility between the modified polyethylene resin and the modified polypropylene resin and a polypropylene resin, particularly, a propylene / ethylene random copolymer. Preferably, the olefin block copolymer is a propylene / ethylene block copolymer A polymer, an ethylene / octene block copolymer, an ethylene / butene block copolymer or an ethylene / hexene block may be used, more preferably a propylene / ethylene block copolymer may be used. In order to maximize the improvement of the compatibility, it is preferable to use one having a density of 0.86 to 0.90 g / cm 3 and a melt flow rate (MFR, 230 ° C, 2.16 kg load) of 1 to 15 g / 10 min.

Such an olefin block copolymer may be contained in an amount of 2 to 30% by weight, preferably 5 to 20% by weight based on the total resin composition in consideration of the adhesive strength between the substrate of the adhesive layer, particularly polyethylene and the polypropylene base.

In the present invention, the tackifier not only allows the adhesive resin composition for a multilayer film to have higher adhesiveness but also has high flexibility and elasticity to enable high moldability to be secured even in the process of manufacturing a coextruded multilayer film For example, aromatic petroleum resin, aliphatic petroleum resin, petroleum resin, hydrogenated petroleum resin, rosin acid, rosin ester, hydrogenated rosin resin, coumarone resin, terpene resin, phenol resin, have.

Here, the petroleum resin is a light yellow or blackish brown thermoplastic resin having a weight average molecular weight of 2,000 or less, which is obtained by polymerizing an unsaturated hydrocarbon in a high-temperature pyrolysis fluid such as naphtha, as an acid catalyst. The aromatic petroleum resin is a resin produced by using C9 oil as a main raw material among the oil produced in the olefin process during the naphtha cracking process, and has a softening point of about 80 to 150 ° C and a weight average molecular weight of about 600 to 1,500. The main component of the aromatic petroleum resin is a copolymer of styrene vinyltoluene,? -Methylstyrene, and indene. Also, the aliphatic petroleum resin is a resin prepared from C5 oil as a raw material among the oil produced in the olefin process during the naphtha cracking process, and has a softening point of about 70 to 100 ° C and a weight average molecular weight of about 800 to 2,000. The major component of the aliphatic petroleum resin is a copolymer of isoprene, piperylene-2-methylbutene-1, and the like. The aliphatic petroleum resin may comprise a petroleum resin prepared from dicyclopentadiene as a raw material. Further, the hydrogenated petroleum resin is a resin formed by adding hydrogen to the aromatic petroleum resin and the aliphatic petroleum resin, and the properties are colorless and transparent, and the overall stability, such as ultraviolet stability, is excellent. The hydrogenated petroleum resin may include a petroleum resin prepared from dicyclopentadiene as a raw material and added with hydrogen.

Such a tackifier may be contained in an amount of 1 to 10% by weight, preferably 2 to 8% by weight based on the total resin composition in consideration of the adhesive strength between the substrate of the adhesive layer, particularly polyethylene and the polypropylene base.

In the present invention, the antioxidant is an additive which is used to perform a role of a radical stopper, so that excessive reaction of radicals generated by the peroxide initiator is suppressed to lower the reaction rate. In the present invention, a phenol-based primary antioxidant or a phosphate-based secondary antioxidant may be used as the antioxidant, and IRGANOX 1010 or NA-11KY may be used, for example.

Such an antioxidant may be contained in an amount of 0.05 to 1% by weight, preferably 0.1 to 0.5% by weight, based on the total resin composition, taking into account the adhesive strength between the substrate of the adhesive layer, particularly polyethylene and the polypropylene base.

The adhesive resin composition for a multilayer film according to the present invention may contain the aforementioned polypropylene resin, modified polyethylene resin, modified polypropylene resin, olefin block copolymer, tackifier and antioxidant in a simple mixed state. In addition, in order to realize higher elasticity and flexibility while securing a higher adhesive force and mechanical properties, the adhesive resin composition for a multilayer film is preferably a polypropylene resin, a modified polyethylene resin, a modified polypropylene resin, an olefin block copolymer, And a reaction extrudate between the inhibitors. Such a reaction extrudate can be obtained by reacting the above components. Specifically, the reaction extrudate may be formed by melt extruding the components at a temperature of 180 to 260 ° C. The reaction extrusion may be performed using a twin screw extruder, and a polypropylene resin, a modified polyethylene resin, a modified polypropylene resin, an olefin block copolymer and an antioxidant may be mixed with a main feeder (main feeder), and a tackifier containing a petroleum resin having a low molecular weight can be supplied through a side feeder.

Conventionally, adhesive materials for multilayer films are mainly manufactured by using a solution method or the like. Such conventional adhesive materials are not suitable for mass production or have not sufficient moldability or flexibility, so that they are not suitable for the production process of a coextruded multilayer film There was a certain limit. On the contrary, the adhesive resin composition for a multilayer film according to the present invention contains the above-mentioned specific components and is formed into a composite by reaction extrusion, thereby ensuring mechanical properties such as excellent adhesion performance, improved flexibility and impact resistance, And can be easily applied to various manufacturing processes such as a manufacturing process of a multilayer film. The reaction extrudate can be obtained in the form of a film or the like in the form of a pellet which is easy to be molded.

Hereinafter, embodiments of the present invention will be described in detail so that those skilled in the art can easily carry out the present invention. However, the following examples are illustrative of the present invention, and the present invention is not limited to the examples described below.

Example

(1) Production of adhesive resin composition for multilayer film

Each component was mixed with the composition (unit: wt%) shown in the following Table 1 and extruded at a temperature of 200 ° C by a 40 mm twin screw extruder to prepare an adhesive resin composition for a multilayer film. The composition (unit: wt%) of the modified linear low density polyethylene resin and the modified polypropylene used are shown in Tables 2 and 3, respectively.

(2) Production of multilayer film

Using the adhesive resin composition for a multilayer film obtained in the above example, the resin composition was applied to a tie-resin between polyethylene and polypropylene using a multilayer film molding machine (line speed 5 m / min) Layer film (PE / tie-resin / PP). The operating conditions of the multilayer film molding machine are shown in Table 4 below.

EXTRUDER 1. TEMP, EXTRUDER 2. TEMP, EXTRUDER 3. TEMP means the temperature of the three extruders used to form the three-layer film using each of the three films. CY1 / CY2 / CY3 / AD1 means the part temperature of the cylinder inside the extruder. In the introduction part CY1, the temperature was set to 170 DEG C and lower than 250 DEG C, which is the temperature of the central part (CY3), in order to prevent melting at the inlet when the resin was supplied. FD1 / FD2 / DE1 / DE2 / DE3 is the temperature range of the extruder feed and die part, which is set equal to the temperature inside the extruder. The stirring speed and pressure applied to each extruder are shown in Table 5 below.

Experimental Example

Peel strength of the film was measured by applying a peel speed of 300 mm / min on the basis of ASTM D882 to the multilayer film manufactured in the above example, and the results are shown in Table 6 below. Figs. 1 to 4 show films produced according to Examples 1 to 4 used for peeling evaluation.

As shown in Table 6, it can be confirmed that the adhesive resin composition prepared according to the embodiment of the present invention has an excellent peel strength of 1 kgf / 15 mm or more at a peel rate of 300 mm / min based on ASTM D882.

The preferred embodiments of the present invention have been described in detail above. It will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Accordingly, the scope of the present invention is defined by the appended claims rather than the foregoing detailed description, and all changes or modifications derived from the meaning, range, and equivalence of the claims are included in the scope of the present invention Should be interpreted.

Claims (9)

20 to 60% by weight of a polypropylene resin;
20 to 60% by weight of a polyethylene resin modified with a dicarboxylic acid or an acid anhydride thereof;
1 to 20% by weight of a polypropylene resin modified with a dicarboxylic acid or an acid anhydride thereof;
2 to 30% by weight of an olefin block copolymer;
Tackifier 1 to 10% by weight; And
0.05 to 1% by weight of an antioxidant;
And an adhesive resin composition for a multilayer film. The method according to claim 1,
Wherein the polypropylene resin is at least one selected from the group consisting of a propylene / ethylene random copolymer, a propylene / ethylene block copolymer, and an ethylene / propylene / alpha-olefin terpolymer. 3. The method of claim 2,
Wherein the propylene / ethylene random copolymer has a density of 0.89 to 0.92 g / cm 3, a melt flow rate (MFR, 230 ° C, 2.16 kg load) of 0.5 to 10 g / 10 min and an ethylene content of 2 to 3.5 wt% Adhesive resin composition for film. The method according to claim 1,
The polyethylene resin was produced using a Ziegler-Natta catalyst having a density of 0.86 to 0.95 g / cm 3, a melt flow rate (MFR, 190 캜, 2.16 kg load) of 1 to 9 g / 10 min and a graft rate of 0.1 to 3 wt% By weight based on the total weight of the adhesive resin composition. The method according to claim 1,
Wherein the polypropylene resin has a graft ratio of 0.5 to 10% by weight and a weight average molecular weight of 1,000 to 100,000. The method according to claim 1,
Wherein the olefin block copolymer is at least one selected from the group consisting of a propylene / ethylene block copolymer, an ethylene / octene block copolymer, an ethylene / butene block copolymer, and an ethylene / hexene block copolymer. Adhesive resin composition for film. The method according to claim 1,
The tackifier may be selected from the group consisting of an aromatic petroleum resin, an aliphatic petroleum resin, a petroleum resin, a hydrogenated petroleum resin, rosin acid, rosin ester, a hydrogenated rosin resin, a coumarone resin, a terpene resin, And the adhesive resin composition for a multilayer film is at least one selected from the group consisting of The method according to claim 1,
Wherein the antioxidant is a phenol-based primary antioxidant or a phosphate-based secondary antioxidant. The method according to claim 1,
Wherein the resin composition has a peel strength of 1 kgf / 15 mm or more as measured by the following method.
[Measurement method of peel strength]
Layer film (PE / tie-resin / PP) as an adhesive layer resin (tie-resin) between polyethylene and polypropylene using a multilayer film molding machine (line speed 5 m / min) , The peel strength is measured when the peel speed of 300 mm / min is applied based on ASTM D882.

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