KR101639485B1 - Adhesive polypropylene resin composition applicable to multi layer film for packaging food - Google Patents

Abstract

Disclosed is a polypropylene-based adhesive resin composition excellent in adhesion, which is applied to a multilayered film laminate made of polypropylene such as a retort container, a film for food packaging, and a tube for food. The present invention relates to a polypropylene resin composition comprising 10 to 70% by weight of a polypropylene resin; 20 to 70% by weight of a linear low density polyethylene resin modified with a dicarboxylic acid or an acid anhydride thereof; 1 to 30% by weight of an olefin block copolymer; 1 to 20% by weight of a tackifier; And 0.01 to 1% by weight of an antioxidant. The present invention also provides an adhesive resin composition for a multilayer film.

Description

TECHNICAL FIELD [0001] The present invention relates to a polypropylene-based adhesive resin composition applicable to food packaging multilayer films,

The present invention relates to an adhesive resin composition for a multilayer film, and more particularly to a polypropylene adhesive resin composition applicable to a multilayer film for food packaging.

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.

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.

Korean Patent Laid-Open Publication No. 2001-0071037 discloses an adhesive composition comprising an ethylene polymer and an adhesion promoter containing a reaction product of a carboxylic acid-grafted polyolefin and a polyamine. However, since such a bonding composition has a limitation of showing a high reactivity to a polar substrate such as a polyurethane foam, there are certain limitations in application to multilayer films in which various polymer resins or metal layers are laminated, But did not secure enough flexibility or elasticity.

On the other hand, retort containers, food packaging films and food multi-layer tubes, which simultaneously require heat resistance and gas barrier properties, are made up of multiple layers of polypropylene and EVOH (or nylon) Resin is applied. Conventionally, in order to produce a modified polypropylene which is added for imparting a polar group to such a polypropylene-based adhesive resin, a method of reacting polypropylene with maleic anhydride in a solution state has been applied. The resin thus produced has a problem that residual solvents and addition reactants And most of them are not suitable for food.

The present invention is to provide a polypropylene-based adhesive resin composition excellent in adhesion, which is applied to a multilayered film laminate made of polypropylene such as a retort container, a film for food packaging, and a tube for food.

In order to solve the above problems, the present invention provides a polypropylene resin composition comprising 10 to 70% by weight of a polypropylene resin; 20 to 70% by weight of a linear low density polyethylene resin modified with a dicarboxylic acid or an acid anhydride thereof; 1 to 30% by weight of an olefin block copolymer; 1 to 20% by weight of a tackifier; And 0.01 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.

Wherein the propylene / ethylene random copolymer has a density of 0.89 to 0.91 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.

Also, the modified linear low density polyethylene resin 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 an adhesive resin composition for a multilayer film.

The modified linear low density polyethylene resin has a density of 0.86 to 0.93 g / cm 3, a melt flow rate (MFR, 190 캜, 2.16 kg load) of 1 to 7 g / 10 min, a graft rate of 0.1 to 3 wt% and a weight average molecular weight ) Is from 50,000 to 1,000,000. The present invention also provides an adhesive resin composition for a multilayer film.

The present invention also provides an adhesive resin composition for a multilayer film, wherein the elastomer is at least one selected from the group consisting of ethylene-octene rubber, ethylene-butadiene rubber, ethylene-propylene rubber and ethylene / 1-butene random copolymer .

Also, the dicarboxylic acid may be at least one selected from the group consisting of maleic acid, phthalic acid, itaconic acid, citraconic acid, alkenylsuccinic acid, cis-1,2,3,6-tetrahydrophthalic acid and 4-methyl-1,2,3,6-tetrahydrophthalic acid And an adhesive resin composition for a multilayer film, wherein the adhesive resin composition is at least one selected from the group consisting of

And the peroxide initiator is 2,5-dimethyl-2,5-di (t-butylperoxy) hexane (DTBPH, 2,5-dimethyl- An adhesive resin composition for a multilayer film is provided.

Also, the olefin block copolymer is at least one selected from the group consisting of an ethylene / octene block copolymer, an ethylene / butene block copolymer, and an ethylene / hexene block copolymer, and provides the adhesive resin composition for a multilayer film .

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 0.9 kgf / 15 mm or more as measured by the following method.

[Measurement method of peel strength]

The resin composition was applied to a three-layer film (EVOH / ethylene terephthalate) as a tie-resin between a polyvinyl alcohol-ethylene copolymer (EVOH) and a polypropylene using a multilayer film molding machine (line speed 5 m / min) tie-resin / PP), and peel strength is measured when peel speed of 300mm / min is applied based on ASTM D882.

According to the present invention, by including the polypropylene resin, the modified linear low density polyethylene resin, the olefin block copolymer, the tackifier and the antioxidant in an optimum range, excellent adhesion performance and appropriate flexibility and impact resistance And can exhibit the best film properties, such as a high transparency and a high transparency.

Figs. 1 to 3 are optical microscope photographs of cross-sectional views of multilayer films prepared according to Examples 1 to 3 of the present invention, respectively.

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.

(EVOH), polyvinyl alcohol (PVOH), polyvinylidene chloride (PVDC), and polyvinylidene chloride (PVDC) as an adhesive layer material applied to a multilayer film laminate made of polypropylene such as a retort container, , Polyamide (PA), aluminum (Al), polyolefin, and the like, the adhesive resin composition for a multilayer film is excellent in adhesion to a polar or non-polar barrier film layer. As a result, It has been found that when the composition is applied to a multilayer film for food packaging, the film exhibits the best film properties such as excellent flexibility and impact resistance by including the low density polyethylene resin, the olefin block copolymer, the tackifier and the antioxidant in an optimum range And led to the present invention.

Accordingly, the present invention provides a polypropylene resin composition comprising 10 to 70% by weight of a polypropylene resin; 20 to 70% by weight of a linear low density polyethylene resin modified with a dicarboxylic acid or an acid anhydride thereof; 1 to 30% by weight of an olefin block copolymer; 1 to 20% by weight of a tackifier; And 0.01 to 1% by weight of an antioxidant; and an adhesive resin composition for a multilayer film.

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 is contained in an amount of 10 to 70% by weight, preferably 20 to 60% by weight, more preferably 20 to 60% by weight based on the total resin composition, in consideration of the adhesive strength between the substrate of the adhesive layer and the polypropylene base material, particularly ethylene vinyl alcohol resin Preferably 29 to 45% by weight.

When the propylene / ethylene random copolymer is used as the polypropylene resin, the density is 0.89 to 0.91 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 linear low-density polyethylene resin modified in the present invention means 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. The modified linear low density polyethylene resin in which the dicarboxylic acid or an acid anhydride thereof is grafted can further improve the compatibility between the polypropylene resin and the tackifier described later, and the adhesive composition can have a homogeneous composition and distribution . The modified linear low density polyethylene resin in which the dicarboxylic acid or its acid anhydride is grafted can also improve the 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 linear low density polyethylene resin preferably comprises 20 to 60 wt% of a linear low density polyethylene resin, 30 to 70 wt% of an elastomer, 0.1 to 10 wt% of a dicarboxylic acid or an acid anhydride thereof, and 0.01 to 1 wt% of a peroxide initiator And more preferably 35 to 50% by weight of a linear low density polyethylene resin, 49 to 64% by weight of an elastomer, 0.5 to 2% by weight of a dicarboxylic acid or an acid anhydride thereof and 0.02 to 0.05% by weight of a peroxide initiator .

The modified linear low density polyethylene resin preferably has a density of 0.86 to 0.93 g / cm 3, a melt flow rate (MFR, 190 캜, 2.16 kg load) of 1 to 7 g / 10 min, a graft rate of 0.1 to 3 wt% Is in the range of 50,000 to 1,000,000, it is suitable for improving the adhesive strength between the ethylene vinyl alcohol resin (EVOH) 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) 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 a modified linear low density polyethylene resin is contained in an amount of 20 to 70% by weight, preferably 30 to 60% by weight, based on the base material of the adhesive layer, in particular, the adhesive strength between the ethylene vinyl alcohol resin (EVOH) By weight, more preferably 40 to 50% by weight.

In the present invention, the olefin block copolymer is used for improving compatibility between the modified linear low density polyethylene resin and a polypropylene resin, particularly a propylene / ethylene random copolymer. Preferably, the olefin block copolymer is an ethylene / octene block copolymer, an ethylene / Butene block copolymer or an ethylene / hexene block copolymer may be used, more preferably an ethylene / octene 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 0.88 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 is contained in an amount of 1 to 30% by weight, preferably 5 to 20% by weight, more 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 ethylene vinyl alcohol resin (EVOH) More preferably from 10 to 15% by weight.

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 is contained in an amount of from 1 to 20% by weight, preferably from 2 to 10% by weight, more preferably from 2 to 10% by weight, based on the total resin composition in consideration of the adhesive strength between the substrate of the adhesive layer, particularly, the ethylene- Preferably 3 to 7% by weight.

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 is contained in an amount of 0.01 to 1% by weight, preferably 0.02 to 0.5% by weight, more preferably 0.02 to 0.5% by weight, based on the total resin composition, in consideration of the adhesive strength between the substrate of the adhesive layer and the polypropylene base material, particularly ethylene vinyl alcohol resin 0.03 to 0.1% by weight.

The adhesive resin composition for a multilayer film according to the present invention may contain the above-mentioned polypropylene resin, modified linear low density polyethylene resin, olefin block copolymer, tackifier and antioxidant in a simple mixed state. In addition, in order to realize improved elasticity and flexibility while securing higher adhesive force and mechanical properties, the adhesive resin composition for a multilayer film is preferably a polypropylene resin, a modified linear low density polyethylene resin, an olefin block copolymer, a tackifier and an antioxidant Extrudates. 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 can be performed using a twin screw extruder. The polypropylene resin, the modified linear low density polyethylene resin, the olefin block copolymer and the antioxidant are mixed in a main feeder at a temperature ranging from 180 to 260 ° C, And a tackifier containing a petroleum resin having a low molecular weight can be introduced 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 polyethylene resin used is shown in Table 2 below.

(2) Production of multilayer film

Using the adhesive resin composition for a multilayer film obtained in the above example, the resin composition was melt-kneaded with a polyvinyl alcohol-ethylene copolymer (EVOH, SOARNOL DC- 3203, DC3212B) and a polypropylene adhesive layer resin (tie-resin) was molded into a three-layer film (EVOH / tie-resin / PP). The operating conditions of the multilayer film molding machine are shown in Table 3 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 4 below.

Experimental Example

(1) Formability evaluation of multilayer film

The moldability of the multilayered film produced in the above Examples was evaluated by the following factors: the feeding activity to the extruder, the spreadability according to the melt index, the thickness and the surface state of the film according to the roll winding speed, and the degree of occurrence of gel.

Figs. 1 to 3 are optical microscope photographs of the multilayered film cross-sections prepared according to Examples 1 to 3, respectively.

First, the feed of the raw material was smooth with the extruder during the production of the three-layer film, and the spreadability according to the melt index was good. Also, referring to FIGS. 1 to 3, the thickness and surface condition of each layer in the prepared three-layer film were observed to be uniform and good, and no point was found where gel occurred in the three-layer film. Therefore, it can be confirmed that the adhesive composition according to the present invention has improved flexibility and elasticity, and can achieve high moldability in the process of manufacturing a coextruded multilayer film.

(2) Evaluation of Peel Strength of Multilayer Film

Peel strength of the film was measured by applying a peel velocity of 300 mm / min on the basis of ASTM D882 to the multilayer film prepared in the above example, and the results are shown in Table 5 below.

As shown in Table 5, it can be confirmed that the adhesive resin composition prepared according to the embodiment of the present invention has an excellent peel strength of 0.9 kgf / 15 mm or more when applied 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 (12)

Used as a tie-resin between a polyvinyl alcohol-ethylene copolymer (EVOH) and a polypropylene applied to a multilayer film laminate of any one of packaging materials selected from the group consisting of retort containers, food packaging films and food tubes. The adhesive resin composition for a multilayer film according to claim 1,
29 to 45% by weight of a polypropylene resin; 40 to 50% by weight of a linear low density polyethylene resin modified with a dicarboxylic acid or an acid anhydride thereof; 10 to 15% by weight of an olefin block copolymer; 3 to 7% by weight of tackifier; And 0.03 to 0.1% by weight of an antioxidant,
The polypropylene resin is a propylene / ethylene random copolymer having a density of 0.89 to 0.91 g / cm 3, a melt flow rate (MFR, 230 캜, 2.16 kg load) of 0.5 to 10 g / 10 min and an ethylene content of 2 to 3.5 wt%
The modified linear low density polyethylene resin has a density of 0.86 to 0.93 g / cm 3, a melt flow rate (MFR, 190 캜, 2.16 kg load) of 1 to 7 g / 10 min, a graft rate of 0.1 to 3 wt% and a weight average molecular weight (Mw) Is characterized by comprising 35 to 50% by weight of a linear low density polyethylene resin, 49 to 64% by weight of an elastomer, 0.5 to 2% by weight of a dicarboxylic acid or an acid anhydride thereof and 0.01 to 1% by weight of a peroxide initiator By weight based on the total weight of the adhesive resin composition. delete delete delete delete The method according to claim 1,
Wherein the elastomer is at least one member selected from the group consisting of ethylene-octene rubber, ethylene-butadiene rubber, ethylene-propylene rubber and ethylene / 1-butene random copolymer. The method according to claim 1,
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 and 4-methyl-1,2,3,6-tetrahydrophthalic acid 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 peroxide initiator is 2,5-dimethyl-2,5-di (t-butylperoxy) hexane (DTBPH, 2,5-dimethyl- Adhesive resin composition for film. The method according to claim 1,
Wherein the olefin block copolymer is at least one selected from the group consisting of an ethylene / octene block copolymer, an ethylene / butene block copolymer, and an ethylene / hexene block copolymer. 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 0.9 kgf / 15 mm or more as measured by the following method.
[Measurement method of peel strength]
The resin composition was applied to a three-layer film (EVOH / ethylene terephthalate) as a tie-resin between a polyvinyl alcohol-ethylene copolymer (EVOH) and a polypropylene using a multilayer film molding machine (line speed 5 m / min) tie-resin / PP), and peel strength is measured when peel speed of 300mm / min is applied based on ASTM D882.

Images