KR101738768B1 - Polypropylene resin composition with excellent adhesive properties and multilayer film - Google Patents

Abstract

Disclosed is a polypropylene resin composition excellent in transparency and adhesiveness by using amorphous polypropylene having a high molecular weight and high compatibility with a polypropylene resin, and a multilayer film produced therefrom. 100 parts by weight of an amorphous polypropylene having a weight average molecular weight of 50,000 to 1,000,000 and a degree of stereochemistry (isotacticity, pentad II, mmmm) of 5 to 20%; 5 to 15 parts by weight of a styrene-ethylene / butylene-styrene (SEBS) block copolymer; And 5 to 20 parts by weight of a random copolymer of styrene-glycidyl methacrylate. The polypropylene resin composition for a multilayer film and the multilayer film produced using the same are also provided.

Description

TECHNICAL FIELD [0001] The present invention relates to a polypropylene resin composition and a multilayer film having excellent adhesion properties,

TECHNICAL FIELD The present invention relates to a polypropylene resin composition, and more particularly, to a polypropylene resin composition and a multilayer film having excellent adhesive properties.

A thin thermoplastic resin film has been used as a wrap film for food packaging and a protective film. Among them, a film made of a vinylidene chloride copolymer resin is often used because it has excellent properties including moisture resistance, oxygen barrier property, heat resistance, adhesion and transparency.

In recent years, various films having a polyolefin-based resin as a main component have been proposed. Examples of such a film include a polyethylene-based resin and a polypropylene-based resin. These films have almost no adhesion or adhesiveness on the surface of the film, and therefore they have a problem that they are not sufficiently adhered to the container when they are used as food packaging films. In order to solve such a problem, a number of films in which a polyolefin film and various additives or other resins are mixed or laminated have been proposed.

Korean Patent Laid-Open Publication No. 1987-0007970 is a technology related to a product for a linear low density polyethylene (LLDPE) food, and has an advantage as an eco-friendly material compared to polyvinyl chloride (PVC). However, heat resistance, tensile strength, There is a problem that it is difficult to use as a pressure-sensitive adhesive wrap product.

Korean Patent Laid-Open Publication No. 2007-0034068 discloses a wrap film in which crystalline polypropylene and amorphous polypropylene are mixed with a plasticizer, but has a disadvantage in that the adhesive strength is low, which is also difficult to use as a pressure sensitive adhesive wrap product.

International Patent Publication No. WO2002-053378 discloses a hot melt adhesive composition comprising atactic polypropylene and isotactic polypropylene, but discloses a composition using a general low molecular weight atactic polypropylene as a high molecular weight atactic polypropylene And there is a problem that the self-tackiness required for the hot-melt adhesion property and the dispersibility in the composition are inferior.

Japanese Laid-Open Patent Publication No. 1996-092439 discloses a resin composition comprising a polypropylene resin and an amorphous polymer having a glass transition temperature of -10 ° C or lower. To improve the impact resistance and fracture characteristics, Since the qualitative polymer is obtained by extracting n-heptane or xylene solubles, the number average molecular weight is relatively low, i.e., 30,000 or less. The low molecular weight amorphous polymer is not only difficult to handle due to viscosity but also has a disadvantage that sufficient dispersion can not be achieved.

On the other hand, polypropylene can be classified into isotactic polypropylene (iPP), syndiotactic polypropylene (sPP), and atactic polypropylene (aPP) depending on the three-dimensional structure. Among them, iPP and sPP have been studied due to their excellent mechanical properties and thermal properties, whereas in the case of aPP, commercial development has been delayed due to limitation of physical properties due to disordered stereoregularity. aPP can be made as a by-product in the initial iPP production slurry process as a heterogeneous catalyst in the recovery of the aliphatic solvent or as a heterogeneous catalyst using modified titanium (III) chloride and an organoaluminum compound such as diethylaluminum chloride as a cocatalyst or activator In the iPP process with improved stereoregularity, amorphous aPP is no longer produced as a by-product, and even if a low-crystallinity PP is produced according to the purpose, it is obtained by adding a comonomer.

The use of a metallocene catalyst system is advantageous in that a uniform aPP having a narrow molecular weight distribution from a high molecular weight to a low molecular weight can be produced with high activity through modification of the catalyst structure. In addition, the physical properties of aPP are greatly influenced by the molecular weight. Since aPP having a low molecular weight is sticky without form even at room temperature, its use is limited and a molecular weight of about 150,000 or more is required to utilize it as a material. However, the aPP obtained from the above catalyst system has a very low polymerization activity even at a high molecular weight, and shows a result of polymerization at a relatively low temperature (below 20 ° C) in order to obtain a high molecular weight.

Under this background, the Applicant has disclosed in Patent Application No. 2011-0033626 a catalyst composition comprising a novel transition metal compound having a thiophene-condensed ring cyclopentadienyl, which is capable of producing a high molecular weight aPP through propylene homopolymerization And a manufacturing technique has been proposed.

The present invention relates to a polypropylene resin composition having excellent transparency and adhesiveness by using amorphous polypropylene having a high molecular weight and high compatibility with a polypropylene type resin developed by the present applicant through the aforementioned Patent Application No. 2011-0033626, To provide a multilayer film produced therefrom.

In order to solve the above problems, the present invention provides a non-crystalline polypropylene resin composition comprising 100 parts by weight of an amorphous polypropylene having a weight average molecular weight of 50,000 to 1,000,000 and a degree of stereochemistry (isotacticity, Pentad I.I, mmmm) of 5 to 20% 5 to 15 parts by weight of a styrene-ethylene / butylene-styrene (SEBS) block copolymer; And 5 to 20 parts by weight of a random copolymer of styrene-glycidyl methacrylate (meth) acrylate.

The amorphous polypropylene is a propylene homopolymer or a copolymer of ethylene and at least one monomer selected from alpha-olefins having 4 to 10 carbon atoms.

Wherein the amorphous polypropylene is polymerized under a catalyst comprising a transition metal compound represented by the following general formula (1).

[Chemical Formula 1]

Wherein M is a Group 4 transition metal, Q ¹ and Q ² are each independently selected from the group consisting of halogen, (C ₁ -C ₂₀ ) alkyl, (C ₂ -C ₂₀ ) alkenyl, (C ₂ -C ₂₀ ) alkynyl C ₆ -C ₂₀₎ aryl; (C ₁ -C ₂₀₎ alkyl (C ₆ -C ₂₀₎ aryl; (C ₆ -C ₂₀₎ aryl (C ₁ -C ₂₀₎ alkyl; (C ₁ -C ₂₀₎ alkyl Amido, (C ₆ -C ₂₀ ) arylamido, or (C ₁ -C ₂₀ ) alkylidene;

R ¹ to R ² and R ⁶ to R ¹⁰ are each independently hydrogen; (C ₁ -C ₂₀ ) alkyl, with or without an acetal, ketal, ether group; Acetals, ketals, which does not contain a group containing an ether or (C ₂ -C ₂₀₎ alkenyl; (C ₁ -C ₂₀ ) alkyl (C ₆ -C ₂₀ ) aryl, with or without an acetal, ketal, ether group; (C ₆ -C ₂₀ ) aryl (C ₁ -C ₂₀ ) alkyl, with or without an acetal, ketal, ether group; Or (C ₁ -C ₂₀ ) silyl with or without an acetal, ketal, ether group; R ¹ may be linked to R ² to form a ring, and at least two of R ⁶ to R ¹⁰ They may be connected to each other to form a ring;

R ³ and R ⁴ are each independently hydrogen or methyl, provided that at least one of R ³ and R ⁴ is methyl;

R ⁵ is (C ₁ -C ₂₀ ) alkyl, with or without an acetal, ketal, ether group;

R ¹¹ , R ¹² and R ¹³ are each independently hydrogen; (C ₁ -C ₂₀ ) alkyl, with or without an acetal, ketal, ether group; Acetals, ketals, which does not contain a group containing an ether or (C ₂ -C ₂₀₎ alkenyl; (C ₁ -C ₂₀ ) alkyl (C ₆ -C ₂₀ ) aryl, with or without an acetal, ketal, ether group; (C ₆ -C ₂₀ ) aryl (C ₁ -C ₂₀ ) alkyl, with or without an acetal, ketal, ether group; (C ₁ -C ₂₀ ) silyl with or without an acetal, ketal, ether group; (C ₁ -C ₂₀₎ alkoxy; Or (C ₆ -C ₂₀₎ aryloxy, and; R ¹¹ and R ¹² or R ¹² and R ¹³ may be connected to each other to form a ring.)

Also, the styrene-glycidyl methacrylate copolymer has a glycidyl methacrylate content of 5 to 25% by weight.

And the polypropylene resin composition further comprises 1 to 50 parts by weight of a crystalline polypropylene homopolymer or crystalline polypropylene-alpha olefin random copolymer with respect to 100 parts by weight of the amorphous polypropylene. A polypropylene resin composition is provided.

In order to solve the above-mentioned problem, the present invention provides a multilayer film comprising a base layer comprising a polypropylene homopolymer or a polypropylene-ethylene copolymer and an adhesive layer comprising the polypropylene resin composition.

According to the present invention, a high molecular weight aPP prepared by using a catalyst composition comprising a novel transition metal compound having a thiophene-condensed ring cyclopentadienyl is used as a component for imparting synergy to the improvement of tackiness, / Butylene-styrene block copolymer and styrene-glycidyl methacrylate random copolymer in an amount sufficient to improve the adhesion property of polypropylene and to have excellent transparency, heat resistance and mechanical properties, and to have a self-adhesive property and a pressure- It is possible to provide a polypropylene resin composition for a multilayer film capable of producing a film.

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 inventors of the present invention have conducted intensive studies to develop a polypropylene resin composition having high transparency and high adhesiveness by using amorphous polypropylene having a high molecular weight and high compatibility with a polypropylene resin. As a result, it has been found that a thiophene-condensed ring cyclopentadienyl Ethylene / butylene-styrene block copolymer and styrene-glycidyl methacrylate random copolymer in a high molecular weight aPP prepared using a catalyst composition comprising a novel transition metal compound having The present inventors have found that a film having self-adhesive property and pressure-sensitive adhesive property can be produced with excellent transparency, heat resistance and mechanical properties while enhancing the adhesive property of polypropylene when used as a pressure-sensitive adhesive layer on a polypropylene base layer.

Accordingly, the present invention relates to a non-crystalline polypropylene resin composition comprising 100 parts by weight of an amorphous polypropylene having a weight average molecular weight of 50,000 to 1,000,000 and a stereoregularity (isotacticity, Pentad I.I, mmmm) of 5 to 20% 5 to 15 parts by weight of a styrene-ethylene / butylene-styrene (SEBS) block copolymer; And 5 to 20 parts by weight of a random copolymer of styrene-glycidyl methacrylate (meth) acrylate.

In the present invention, the amorphous polypropylene can be polymerized under a catalyst containing a specific transition metal compound described below at a glass transition temperature of -20 캜 or lower, which is much lower than that of the crystalline polypropylene.

The amorphous polypropylene has a weight average molecular weight of 50,000 to 1,000,000 and a degree of stereochemistry (isotacticity, Pentad I.I, mmmm) of 5 to 20%. The weight average molecular weight may preferably be 100,000 to 800,000 and the stereoregularity may be 5 to 15%, more preferably 200 to 500,000 and the stereoregularity may be 5 to 10%. The density of the amorphous polypropylene is preferably 0.8 to 0.9 g / ml, more preferably 0.82 to 0.9 g / ml, and most preferably 0.82 to 0.89 g / ml. The molecular weight distribution (Mw / Mn) of the amorphous polypropylene is preferably 1 to 10, more preferably 1.5 to 8, and most preferably 2 to 6. If the weight average molecular weight is less than 50,000, the use may be limited because the resin is sticky at room temperature. If the weight average molecular weight is more than 1,000,000, the flowability of the resin may be deteriorated and moldability may be poor.

As the amorphous polypropylene, a propylene homopolymer may be used, but not limited thereto, a copolymer of ethylene and at least one monomer selected from alpha-olefins having 4 to 10 carbon atoms may be used. At this time, the content of the monomer is preferably 5 to 30% by weight, more preferably 15 to 25% by weight.

Such amorphous polypropylene can be produced by referring to Patent Application No. 2011-0033626 proposed by the present applicant. That is, in the present invention, the amorphous polypropylene may be a polymer obtained by polymerization under a catalyst containing a transition metal compound represented by the following general formula (1).

[Chemical Formula 1]

Wherein M is a Group 4 transition metal, Q ¹ and Q ² are each independently selected from the group consisting of halogen, (C ₁ -C ₂₀ ) alkyl, (C ₂ -C ₂₀ ) alkenyl, (C ₂ -C ₂₀ ) alkynyl C ₆ -C ₂₀₎ aryl; (C ₁ -C ₂₀₎ alkyl (C ₆ -C ₂₀₎ aryl; (C ₆ -C ₂₀₎ aryl (C ₁ -C ₂₀₎ alkyl; (C ₁ -C ₂₀₎ alkyl Amido, (C ₆ -C ₂₀ ) arylamido, or (C ₁ -C ₂₀ ) alkylidene;

R ¹ to R ² and R ⁶ to R ¹⁰ are each independently hydrogen; (C ₁ -C ₂₀ ) alkyl, with or without an acetal, ketal, ether group; Acetals, ketals, which does not contain a group containing an ether or (C ₂ -C ₂₀₎ alkenyl; (C ₁ -C ₂₀ ) alkyl (C ₆ -C ₂₀ ) aryl, with or without an acetal, ketal, ether group; (C ₆ -C ₂₀ ) aryl (C ₁ -C ₂₀ ) alkyl, with or without an acetal, ketal, ether group; Or (C ₁ -C ₂₀ ) silyl with or without an acetal, ketal, ether group; R ¹ may be linked to R ² to form a ring, and at least two of R ⁶ to R ¹⁰ They may be connected to each other to form a ring;

R ³ and R ⁴ are each independently hydrogen or methyl, provided that at least one of R ³ and R ⁴ is methyl;

R ⁵ is (C ₁ -C ₂₀ ) alkyl, with or without an acetal, ketal, ether group;

R ¹¹ , R ¹² and R ¹³ are each independently hydrogen; (C ₁ -C ₂₀ ) alkyl, with or without an acetal, ketal, ether group; Acetals, ketals, which does not contain a group containing an ether or (C ₂ -C ₂₀₎ alkenyl; (C ₁ -C ₂₀ ) alkyl (C ₆ -C ₂₀ ) aryl, with or without an acetal, ketal, ether group; (C ₆ -C ₂₀ ) aryl (C ₁ -C ₂₀ ) alkyl, with or without an acetal, ketal, ether group; (C ₁ -C ₂₀ ) silyl with or without an acetal, ketal, ether group; (C ₁ -C ₂₀₎ alkoxy; Or (C ₆ -C ₂₀₎ aryloxy, and; R ¹¹ and R ¹² or R ¹² and R ¹³ may be connected to each other to form a ring.)

At this time, the transition metal compound of the formula (1) is activated by the cocatalyst compound to give an activity to the polymerization reaction of propylene. As the cocatalyst compound, the transition metal compound of the formula (1) Any compound capable of activating a metal compound can be used without limitation. As such a promoter compound, for example, compounds represented by the following formulas (2) to (4) can be used.

(2)

(R ³¹ is a (C1-C20) hydrocarbyl radical substituted independently with a halogen radical, a (C1-C20) hydrocarbyl radical or a halogen;

(3)

(D is aluminum or boron; R ⁷¹ is independently a (C1-C20) hydrocarbyl radical substituted with a halogen radical, a (C1-C20) hydrocarbyl radical or a halogen)

[Chemical Formula 4]

(C 1 -C 20) hydrocarbyl, (C 1 -C 20) alkoxy or (C 6 -C 20) alkanoyl group, wherein L is a neutral or cationic Lewis acid, Z is a Group 13 element, (C6-C20) aryl or (C1-C20) alkyl radical substituted with an aryloxy radical.

In the present invention, the preparation of the amorphous polypropylene can be carried out by polymerizing propylene in the presence of the catalyst compound, which may be carried out in slurry, liquid, vapor or bulk according to known methods, Semi-continuous or continuous reaction, and a specific manufacturing method can be referred to Patent Application No. 2011-0033626 filed by the present applicant.

The polypropylene resin composition according to the present invention comprises a styrene-ethylene / butylene-styrene (SEBS) block copolymer in order to increase the heat resistance of the amorphous polypropylene and to reduce the blocking phenomenon with the substrate layer. Ethylene / butylene-styrene (SEBS) block copolymer by including a random copolymer of styrene-glycidyl methacrylate in addition to the styrene-ethylene / butylene-styrene (SEBS) The dispersibility of the block copolymer can be enhanced and the adhesive strength can be further enhanced by introducing a glycidyl methacrylate (GMA) group.

Ethylene / butylene-styrene (SEBS) block copolymer and styrene-glycidyl methacrylate (hereinafter referred to as " styrene-glycidyl methacrylate ") in view of maximizing transparency and tackiness when applied to a base layer of a final polypropylene resin composition. methacrylate random copolymer is 5 to 15 parts by weight and 5 to 20 parts by weight, preferably 8 to 12 parts by weight and 8 to 15 parts by weight, based on 100 parts by weight of the amorphous polypropylene. The styrene-glycidyl methacrylate random copolymer was found to have an optimal degree of adhesion strength depending on the content of glycidyl methacrylate (GMA) introduced therein. The content of the styrene-glycidyl methacrylate random copolymer It is preferably 5 to 25% by weight, more preferably 15 to 25% by weight.

On the other hand, since the higher the content of the copolymer or the lower the weight average molecular weight, the better the adhesion, the adhesive strength can be adjusted according to the application by controlling the presence or absence of the copolymer, the content, and the molecular weight. If it is desired to have a low adhesive force, it can be controlled by blending with crystalline polypropylene. However, when the content of crystalline polypropylene exceeds 50 parts by weight with respect to 100 parts by weight of the amorphous polypropylene, the adhesive strength may be very low.

The crystalline polypropylene polymer may be a propylene homopolymer or may be a random copolymer of ethylene or a propylene-alphaolefin random copolymer obtained by randomly copolymerizing ethylene or one or more alpha-olefins having 4 to 10 carbon atoms have. The crystalline propylene polymer may be prepared by a commonly known method. However, in order to suitably use the polypropylene resin composition according to the present invention for film forming, the crystalline polypropylene resin preferably has a melt index of 1 to 15 g / 10 min (230 ° C, 2.16 kg load). When the melt index is less than 1 g / 10 min, flowability is poor and moldability may be deteriorated. When the melt index is more than 15 g / 10 min, it is not preferable for film molding.

The ethylene-propylene random copolymer as the crystalline polypropylene resin is a crystalline copolymer containing propylene as a main component and can be produced by a conventionally known method. For example, it can be prepared by slurry bulk polymerization at a reaction temperature of 65 to 75 ° C and a pressure of 32 to 35 K / G after injecting propylene and ethylene simultaneously into a polymerization reactor, injecting triethylaluminum, a diisocyanate catalyst and a silane-based electron donor And the melt index can be controlled by hydrogen. The polymerization reactor can be made in any combination of loop, loop and gas phase reactors. On the other hand, it is expected that the properties of the ethylene-propylene random copolymer can be improved by using a diester catalyst as the catalyst, but not limited thereto, a Ziegler-Natta catalyst, a metallocene catalyst and the like can also be used.

At this time, the ethylene-propylene random copolymer plays a role of maintaining the mechanical strength of the finally prepared resin composition and improving the adhesiveness while maintaining the heat resistance and transparency. The ethylene content of the random copolymer is preferably 0.5 to 10% by weight , More preferably from 1 to 7 wt%, most preferably from 2 to 5 wt%. When the ethylene content is less than 0.5% by weight, the degree of crystallinity of the copolymer is excessively high, thereby lowering the transparency of the entire composition. If the ethylene content is more than 10% by weight, the heat resistance may be deteriorated.

Meanwhile, the polypropylene resin composition according to the present invention may contain conventionally used nucleating agents, antioxidants, catalyst neutralizing agents, antistatic agents and the like. If necessary, the polypropylene resin composition may contain heat stabilizers, weathering stabilizers, Lubricants, slip agents, flame retardants, pigments, dyes and the like can be used in combination.

In the present invention, the polypropylene resin composition may be used as an adhesive layer for a base layer to form a multilayered film having a total thickness of 5 to 80 탆, which can be used for various purposes. When excellent transparency or impact strength is desired, a propylene copolymer can be used for the substrate layer, and a polypropylene homopolymer can be used when high strength is desired. In addition, the amorphous polypropylene has an excellent adhesive strength, so that an anti-blocking agent or a plasticizer can be used for the substrate layer.

The multilayer film comprising the base layer and the adhesive layer can be produced by a conventionally known method such as a monoaxially stretched or biaxially stretched film former. Such a multilayer film can be used as a molded article such as wrapping wrap, protective film, tape, waterproof packing agent, medical dressing, label, and the like.

Hereinafter, a specific embodiment of the present invention will be described.

Example 1

Molecular weight distribution (Mw / Mn) of 300,000, a weight average molecular weight (measured by GPC method, PL-GPC220, Agilent) of 300,000, 10 parts by weight of a styrene-ethylene / butylene-styrene (SEBS) block copolymer and 10 parts by weight of glycidyl methacrylate in 100 parts by weight of a polypropylene resin And 10 parts by weight of a styrene-glycidyl methacrylate random copolymer (product name: Addico 9302) were blended to prepare a polypropylene resin composition.

[Production method of amorphous polypropylene]

Patent Application No. 2011-0033626. The interior of the high-pressure reactor (internal volume: 2 L, stainless steel) was replaced with nitrogen at room temperature. About 4.0 ml of a toluene solution of methylaluminoxane (10 wt% solution of methylaluminoxane in toluene, 6 mmol of Al, manufactured by Albemarle) was added to the reactor, and then 500 g of propylene was added and the temperature was raised to 70 캜. Then, a solution (1.5 ml, 3.0 占 퐉 ol of Ti) in which toluene was dissolved in the transition metal compound represented by the following formula (5) was injected into the reactor and polymerization was carried out. After the polymerization reaction was carried out, the temperature was lowered to room temperature, excess propylene was removed, and the polymer was recovered. The resulting polymer was dried in a vacuum oven at 80 DEG C for 4 hours or more to obtain polypropylene.

[Chemical Formula 5]

Example 2

Except that 10 parts by weight of a crystalline ethylene-propylene random copolymer (ethylene content: 3% by weight, melt index: 2.4 g / 10 min) was further added to 100 parts by weight of the amorphous polypropylene in Example 1 A polypropylene resin composition was prepared in the same manner as in Example 1.

Example 3

The same procedure as in Example 2 was repeated except for using an ethylene-propylene elastic copolymer prepared so as to have an ethylene content of 20% by weight by adding an ethylene monomer together with propylene in the production of amorphous polypropylene in Example 2, A composition was prepared.

Comparative Example 1

Except that a styrene-ethylene / butylene-styrene (SEBS) block copolymer and a styrene-glycidyl methacrylate random copolymer were not used in Example 2, To prepare a polypropylene resin composition.

Comparative Example 2

A linear low density polyethylene (LLDPE) resin polymerized with a metallocene catalyst having a melt index of 4 g / 10 min (230 캜, 2.16 kg load) was prepared.

Comparative Example 3

Propylene-1-butene copolymer (GOA0102, Lotte Chemical) having 6 to 8% by weight of grafted maleic anhydride (MAH) and a weight average molecular weight of 60,000 to 70,000 was prepared.

Experimental Example

And a crystalline propylene homopolymer having a melt index of 3.5 g / 10 min (at 230 DEG C under a load of 2.16 kg) was used as a base layer having a thickness of 50 to 55 mu m, and the polypropylene resin composition, linear low density polyethylene Resin or propylene-1-butene copolymer was used as a pressure-sensitive adhesive layer having a thickness of 5 to 10 탆, and the adhesive strength was tested according to the following method. The results are shown in Table 1 below.

[Adhesive strength test method]

1) Glass: Measured at an angle of 90 ° and a speed of 300 mm / min using an adhesion tester (apparatus name: K-OPC, manufactured by Kyung Jin High Tech).

2) PET: Measured at 180 ° angle and 300 mm / min using an adhesion tester (K-OPC, manufactured by Kyung Jin High Tech).

Referring to Table 1, when the polypropylene resin composition according to the present invention was used as an adhesive layer, the adhesive strength was superior to that of the conventional LLDPE (Comparative Example 2), and the tensile strength and heat resistance Do.

That is, a styrene-ethylene / butylene-styrene (SEBS) block copolymer excellent in heat resistance and anti-blocking property and a styrene-butadiene block copolymer containing a GMA group, which is high in compatibility with a polypropylene base layer and easy to handle, Ethylene / butylene-styrene (SEBS) block copolymer (LLDPE) as well as conventional styrene-butadiene styrene (SEBS) block copolymer as well as conventional LLDPE by blending random copolymer of styrene- (Comparative Example 1) in the case where a random copolymer of styrene-glycidyl methacrylate and styrene-glycidyl methacrylate was not used (Comparative Example 1) Example 2), the use of an amorphous ethylene-propylene elastomeric copolymer instead of the amorphous propylene homopolymer (Example 3) .

On the other hand, when a propylene-1-butene copolymer in which a predetermined amount of maleic anhydride (MAH) is grafted is used, the same level of tackiness can be realized as compared with the case where the polypropylene resin composition according to the present invention is used as an adhesive layer , The propylene-1-butene copolymer is more efficient than the aPP used in the present invention in that the polymerization process is complicated and expensive, and the polypropylene resin composition according to the present invention is used.

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 (6)

100 parts by weight of an amorphous polypropylene having a weight average molecular weight of 50,000 to 1,000,000 and a stereoregularity (isotacticity, pentad II, mmmm) of 5 to 20%;
5 to 15 parts by weight of a styrene-ethylene / butylene-styrene (SEBS) block copolymer; And
5 to 20 parts by weight of a random copolymer of styrene-glycidyl methacrylate;
And a polypropylene resin composition for a multilayer film. The method according to claim 1,
Wherein the amorphous polypropylene is a propylene homopolymer or a copolymer of ethylene and at least one monomer selected from alpha olefins having 4 to 10 carbon atoms. The method according to claim 1,
Wherein the amorphous polypropylene is polymerized under a catalyst comprising a transition metal compound represented by the following formula (1).
[Chemical Formula 1]

Wherein M is a Group 4 transition metal, Q ¹ and Q ² are each independently selected from the group consisting of halogen, (C ₁ -C ₂₀ ) alkyl, (C ₂ -C ₂₀ ) alkenyl, (C ₂ -C ₂₀ ) alkynyl C ₆ -C ₂₀₎ aryl; (C ₁ -C ₂₀₎ alkyl (C ₆ -C ₂₀₎ aryl; (C ₆ -C ₂₀₎ aryl (C ₁ -C ₂₀₎ alkyl; (C ₁ -C ₂₀₎ alkyl Amido, (C ₆ -C ₂₀ ) arylamido, or (C ₁ -C ₂₀ ) alkylidene;
R ¹ to R ² and R ⁶ to R ¹⁰ are each independently hydrogen; (C ₁ -C ₂₀ ) alkyl, with or without an acetal, ketal, ether group; Acetals, ketals, which does not contain a group containing an ether or (C ₂ -C ₂₀₎ alkenyl; (C ₁ -C ₂₀ ) alkyl (C ₆ -C ₂₀ ) aryl, with or without an acetal, ketal, ether group; (C ₆ -C ₂₀ ) aryl (C ₁ -C ₂₀ ) alkyl, with or without an acetal, ketal, ether group; Or (C ₁ -C ₂₀ ) silyl with or without an acetal, ketal, ether group; R ¹ may be linked to R ² to form a ring, and at least two of R ⁶ to R ¹⁰ They may be connected to each other to form a ring;
R ³ and R ⁴ are each independently hydrogen or methyl, provided that at least one of R ³ and R ⁴ is methyl;
R ⁵ is (C ₁ -C ₂₀ ) alkyl, with or without an acetal, ketal, ether group;
R ¹¹ , R ¹² and R ¹³ are each independently hydrogen; (C ₁ -C ₂₀ ) alkyl, with or without an acetal, ketal, ether group; Acetals, ketals, which does not contain a group containing an ether or (C ₂ -C ₂₀₎ alkenyl; (C ₁ -C ₂₀ ) alkyl (C ₆ -C ₂₀ ) aryl, with or without an acetal, ketal, ether group; (C ₆ -C ₂₀ ) aryl (C ₁ -C ₂₀ ) alkyl, with or without an acetal, ketal, ether group; (C ₁ -C ₂₀ ) silyl with or without an acetal, ketal, ether group; (C ₁ -C ₂₀₎ alkoxy; Or (C ₆ -C ₂₀₎ aryloxy, and; R ¹¹ and R ¹² or R ¹² and R ¹³ may be connected to each other to form a ring.) The method according to claim 1,
Wherein the styrene-glycidyl methacrylate copolymer has a glycidyl methacrylate content of 5 to 25% by weight. The method according to claim 1,
Wherein the polypropylene resin composition further comprises 1 to 50 parts by weight of a crystalline polypropylene homopolymer or a crystalline polypropylene-alpha olefin random copolymer with respect to 100 parts by weight of the amorphous polypropylene. Propylene resin composition. A multilayer film comprising a substrate layer comprising a polypropylene homopolymer or a polypropylene-ethylene copolymer, and an adhesive layer comprising the polypropylene resin composition of any one of claims 1 to 5.