KR101145072B1 - Polypropylene-ethylene block copolymer resin compositions for film having improved impact strength and orange peel by using organic-peroxides - Google Patents

Abstract

The present invention relates to a polypropylene-ethylene block copolymer resin composition, comprising: 90 to 95% by weight of a polypropylene block copolymer, 5 to 10% by weight of a propylene-ethylene random copolymer, and a polypropylene block copolymer consisting of 200 to 500 ppm of peroxide. It relates to a resin composition.

According to the present invention, a resin composition of a polypropylene block copolymer having excellent physical properties of a polypropylene-ethylene block copolymer resin for films such as low temperature impact resistance, orange peel development, heat resistance, peel strength and appearance using a peroxide can be provided. Can be.

Polypropylene-ethylene block copolymer, peroxide, impact strength, orange peel, heat resistance, peel strength.

Description

POLYPROPYLENE-ETHYLENE BLOCK COPOLYMER RESIN COMPOSITIONS FOR FILM HAVING IMPROVED IMPACT STRENGTH AND ORANGE PEEL BY USING ORGANIC-PEROXIDES}

The present invention relates to the impact strength of the retort packaging film, the orange peel and a resin composition thereof, and more particularly, to a polypropylene-ethylene block copolymer resin composition for films having improved impact strength and orange peel using a peroxide. The film prepared by adding a peroxide to such a resin composition has a strong resistance to whitening, heat fusion, and heat deformation after sterilization, and has excellent performance in high impact strength and orange peel phenomenon.

The present invention relates to a polypropylene block copolymer to which the peroxide is applied and a film thereof. In particular, the present invention relates to a polypropylene block copolymer and a film thereof having excellent appearance and having excellent impact resistance at low temperatures, heat resistance and excellent peel strength after sterilization.

Polypropylene films are widely used in packaging fields such as food packaging, textile packaging, etc. because of their excellent appearance, mechanical properties, packaging compatibility, and the like.

An unstretched polypropylene film comprising a propylene homopolymer, a random copolymer of propylene and an α-olefin or a polypropylene block copolymer, respectively, is a propylene homopolymer, a random copolymer of propylene and an α-olefin or a polypropylene block air. By utilizing the properties of the copolymers, they are used in various packaging applications, but conventional unstretched polypropylene films can be used in appearance, impact resistance at low temperatures, heat resistance and peel strength depending on the polymer or copolymer used for each film. One or more properties are insufficient. Thus each film is limited in its use.

Films containing propylene homopolymers have excellent appearance and heat resistance but poor impact resistance at low temperatures, and films containing random copolymers of propylene and α-olefins have poor appearance, impact resistance and heat resistance, and polypropylene The film including the block copolymer has good impact resistance but poor appearance due to the expression of fisheye. As above, each film is limited in its use.

In addition, attempts have been made to blend propylene copolymers or copolymers with low crystalline EPR (ethylene propylene rubber) to improve the above properties, but these attempts are still poor in terms of impact resistance and heat resistance at low temperatures.

As a prior art for solving the above problems, Republic of Korea Patent Publication No. 10-2009-0007044 is composed of 80 to 95% by weight of high crystalline homopolypropylene and 5 to 20% by weight of ethylene-propylene elastomer, the absolute viscosity ratio The ethylene-propylene block copolymer-based polypropylene resin composition having a melt index of 100 parts by weight of polypropylene having 0.09 to 0.33 and 0.05 to 3 parts by weight of nucleating agent was proposed, but it has fluidity, rigidity and impact. The present invention relates to a resin composition of a product having excellent strength, but not to a product having improved heat resistance, orange peel and peel strength.

Japanese Laid-Open Patent Publication No. 2003-183418 is a film of a propylene-ethylene block copolymer having a melting point of 150 to 168 ° C. The film has a tertiary basic surface roughness (center surface average roughness) of 0.08 to 0.50 µm and a surface roughness. The present invention relates to a resin composition of an orange peel-improved product having a strain rate of -10 to 50%, but is not a product having improved impact strength and peel strength.

Japanese Patent Laid-Open No. 2003-55510 is a polypropylene resin composition comprising 75 to 90% by weight of a propylene polymer component and 10 to 25% by weight of a propylene α-olefin random copolymer component having a propylene content of 75 to 85% by weight. Preferred is a resin composition of a product having improved impact resistance with a propylene α-olefin block copolymer having an intrinsic viscosity of 2 to 4 (dl / g) and a MFR (melt index) of the composition of 0.5 to 10 g / 10 min. It is not about improved heat resistance and orange peel.

Japanese Patent Laid-Open No. 2003-95251 is composed of a propylene polymer component (A), a propylene α-olefin random copolymer component (B) and an ethylene α-olefin random copolymer component (C), and has a melt index (230 ° C.) (A) / (B) is 85 / 15-97 / 3 (weight ratio), and the intrinsic viscosity of (B) is 2.5-4.5 dl / g and propylene content of 65 ~ 80% by weight, (C) density of 0.865 ~ 0.910g / ㎝ has been proposed for the resin composition of the product improved impact resistance and heat resistance, but fish eye and orange peel improved It is not a product.

In order to compensate for the above disadvantages, a propylene block copolymer, an ethylene-propylene random copolymer, and a peroxide are combined to invent a polypropylene resin composition having excellent appearance, impact resistance, heat resistance, peel strength, and the like.

The present invention has been made to solve the problems of the prior art, to provide a resin composition of a polypropylene block copolymer having excellent low temperature impact resistance and orange peel phenomenon, heat resistance and peel strength and appearance.

In addition, the present invention provides a polypropylene block copolymer resin composition particularly suitable for film applications requiring heat resistance, low temperature impact resistance, and orange peel improvement, such as retort food packaging films, frozen food packaging films, and protective films.

As a means for solving the above technical problem, the present invention, in the polypropylene block copolymer resin composition, crystalline polypropylene block copolymer 90 to 95 containing 85 to 99.5% by weight of propylene and 0.5 to 15% by weight of ethylene weight%; 5-10 wt% of an amorphous or low crystalline ethylene-propylene random copolymer comprising 70-85 wt% of propylene; And a peroxide of 200 to 500 ppm, the crystalline polypropylene block copolymer has a melting temperature of 150 to 165 ° C, and the propylene portion of the crystalline polypropylene block copolymer has an intrinsic viscosity of 2.0 to 3.0 dl / g, ethylene -The propylene rubber part has an intrinsic viscosity of 2.0 to 3.5dl / g and a C2 content of 40 to 70% by weight, and the impact strength of the film produced by melt extrusion of the polypropylene block copolymer resin composition is 4030 to 5250g, the peel strength It provides a polypropylene block copolymer resin composition for packaging films, characterized in that the orange peel phenomenon does not occur in the 24 ~ 30N / 15mm and the appearance of the film.

In addition, the crystalline polypropylene block copolymer is a polypropylene block copolymer resin composition for packaging films, characterized in that the melt index is 1.0 ~ 5.0g / 10min, the melt index of the homo portion is 1.0 ~ 5.0g / 10min to provide.

In addition, the ethylene-propylene random copolymer provides a polypropylene block copolymer resin composition for packaging films, characterized in that the density is 0.910g / cm 3 or less, the melt index is 1 ~ 10g / 10min.

In addition, the peroxide provides a polypropylene block copolymer resin composition for packaging films, characterized in that the density is 0.95 ~ 1.10g / cm 3, the reaction temperature is 90 ~ 220 ℃ impregnated in polypropylene.

In addition, the polypropylene block copolymer resin composition provides a polypropylene block copolymer resin composition for packaging films, characterized in that the melt index is 4.7 ~ 8.0g / 10min.

The present invention is a packaging film prepared by melt-extrusion of the polypropylene block copolymer resin composition, the impact strength of the film 4030 ~ 5250g, the peel strength of 24 ~ 30N / 15mm and the appearance of the orange peel phenomenon in the film It provides a packaging film, characterized in that not.

According to the present invention, it is possible to provide a resin composition of a polypropylene block copolymer having excellent low temperature impact resistance, orange peel development, heat resistance, peel strength and appearance using a peroxide.

In addition, it is possible to provide a polypropylene block copolymer resin composition particularly suitable for film applications requiring heat resistance, low temperature impact resistance, and orange peel improvement, such as retort food packaging films, frozen food packaging films, and protective films.

The polypropylene resin composition of the present invention is prepared using (A) 90 to 95% by weight of a crystalline polypropylene block copolymer containing 85 to 99.5% by weight of propylene and 0.5 to 15% by weight of ethylene (B) a Ziegler-Natta catalyst. Polypropylene-ethylene block copolymer, characterized in that the propylene content of 70-85% by weight of amorphous or low-crystalline propylene-ethylene random copolymer 5-10% by weight (C) made of peroxide that can control the flowability of the resin product Resin composition.

(A) Polypropylene Block Copolymer

Polypropylene resin used in the present invention is a polypropylene block copolymer resin melt temperature is 150 ~ 165 ℃, melt index 1.0 ~ 5.0g / 10min (230 ℃, 2.16kg) according to ASTM D1238 standard, the limit of propylene Viscosity is 2.0-3.0 dl / g, soluble fraction in xylene is 6-8%, normal hexane extraction is 4% or less, the ultimate viscosity of ethylene-propylene rubber is 2.0-3.5 dl / g, C2 content of ethylene-propylene rubber Is a crystalline polypropylene block copolymer containing 40 to 70% by weight and having a melt index of 1.0 to 5.0 g / 10 min (230 ° C., 2.16 kg) of the homo portion of the crystalline polypropylene block copolymer. If the melting temperature of polypropylene block copolymer resin is 150 degrees C or less, orange peel phenomenon will generate | occur | produce on the film surface after sterilization of a film product, and if melt temperature is 165 degreeC or more, heat adhesiveness is inferior, and it is unpreferable.

The content of the polypropylene block copolymer resin is preferably 90 to 95% by weight relative to the total amount of the resin in the resin composition of the present invention. If the content of the polypropylene block copolymer resin is less than 90% by weight of the total resin component, the impact strength is lowered, and if the content exceeds 95% by weight, the orange peel phenomenon occurs badly during film sterilization, inferior in workability.

In addition, if the intrinsic viscosity of propylene and ethylene and the C2 content of ethylene-propylene rubber are not appropriate, orange peel phenomenon will occur, which is not preferable for films.

(B) Propylene-ethylene random copolymer

The propylene-ethylene random copolymer used in the present invention is an amorphous or low crystalline propylene-ethylene random copolymer having a propylene content of 70 to 85% by weight using a Ziegler-Natta catalyst and has a density of 0.910 g / cm 3 or less. The melt index according to ASTM D1238 standard is characterized in that 1 ~ 10g / 10min (190 ℃, 2.16kg).

The content of the propylene-ethylene random copolymer is preferably 5 to 10% by weight based on the total amount of the resin in the resin composition of the present invention. If the content of the propylene-ethylene random copolymer is less than 5% by weight of the total resin component, the effect of compensating the impact strength is small, and if it exceeds 10% by weight, the orange peel phenomenon appears, which is not preferable.

(C) peroxide

The peroxide used in the present invention serves to decompose the polymer chain of polypropylene in the polypropylene-ethylene block copolymer and to crosslink the ethylene component in the propylene-ethylene rubber component. Particularly in the case of peroxides, the flowability of the resin is increased mainly through the cleavage of the polymer chain of polypropylene, and one or more stable free radicals are incorporated into the resin in a viscous state to form a product having an increased flow index. In addition, the viscosity ratio of the propylene homopolymer and the propylene-ethylene rubber component is lowered, thereby increasing the dispersibility of the rubber, thereby compensating for the impact strength.

In the case of the peroxide, the density is in the range of 0.95 ~ 1.10g / cm 3, the reaction temperature is used between 90 ~ 220 ℃ product, for the stability of the product should be used compound products impregnated in polypropylene. At this time, the content of the peroxide is preferably 200 ~ 500ppm, less than 200pm processability in the manufacturing process of the film is deteriorated due to the formation of wrinkles of the film is difficult to form the film and the peeling strength is lowered, polypropylene-ethylene exceeds 500ppm The orange peel phenomenon occurs due to the crosslinking of the ethylene of the block copolymer, which is not preferable.

In addition to the above components, various additives such as heat stabilizers, slip agents, neutralizers, and the like, which are commonly used in the manufacture of a film resin composition, may be added to the resin composition of the present invention within a range not departing from the characteristics of the present invention.

In the method of manufacturing the resin composition of this invention, a singular point is adjusting the screw speed and extrusion temperature of an extruder suitably. That is, when the screw speed and the extrusion temperature of the extruder to produce the resin at an appropriate level or more, the orange peel phenomenon is remarkable, it is necessary to maintain the appropriate level.

Hereinafter, the present invention will be described in more detail with reference to the following examples. However, the scope of the present invention is not limited to the following examples.

First, the processability of the resin composition of this invention and the physical property evaluation method of the film manufactured from this resin composition are demonstrated.

[Measurement Method]

-Melt Flow Index: ASTM D1238 (230 ℃, 2.16kg)

Melting point (Tm): After pre-melting 10 mg of the specimen for 5 minutes at 220 ° C. under a nitrogen gas atmosphere using a differential scanning calorimeter (trade name DSC, manufactured by Perkin-Elmer Co.), The temperature is lowered to 40 ° C. at a temperature reduction rate of 5 ° C./min. The temperature is then raised at a rate of temperature increase of 5 ° C./min, and the peak temperature of the maximum peak of the obtained melt endothermic curve is defined as the melting point (Tm).

In addition, melting | fusing point of indium (In) measured by using the said measuring apparatus at the temperature increase rate of 5 degree-C / min is 156.6 degreeC.

[Film characteristics]

Each film whose thickness is 70 micrometers is measured by the following method.

-Orange peel: Observing the appearance of the film visually, the film whose surface surface is similar to the tangerine peel is said to be bad and defined as having a smooth surface of general CPP type.

-Impact strength: After cutting the film shaped to 70 ~ 80㎛ to 20cm * 30cm size, each impact strength is hemispherical impact head with a diameter of 15mm by a film impact tester manufactured by TOYOSEKI SEISAKU SHOW LTD. Measure using

-Heat resistance test: Measures the degree of deformation of the film after heating the finished film before sterilization in a high pressure sterilizer under high temperature (140 ° C.) and high pressure (1.5 kg / cm 2) for 5 minutes.

-Peeling strength: Heat-bonding the sterilized finished film and cutting the bonded film to 15mm width to measure the peeling strength of each film at 180 ° peeling angle at 23 ℃ and 200mm / min peeling speed. box.

Example  One

As shown in Table 1, A) polypropylene block copolymer [melt index (230 ° C., 2.16 kg) 2.0 g / 10 min] 95 wt%, B) propylene-ethylene random copolymer [density 0.867 g / cm 3, melt index (190 ° C., 2.16 kg) 2.9 g / 10 min] 5 wt%, C) 200 ppm peroxide was kneaded to prepare a polypropylene block copolymer resin composition having a melt index of 4.7 g / 10 min. The processability of the said resin composition and the physical property of the film manufactured by this resin composition were evaluated, and the result is shown in Table 2.

Example  2

As shown in Table 1, A) polypropylene block copolymer [melt index (230 ° C., 2.16 kg) 2.0 g / 10 min] 90 wt%, B) propylene-ethylene random copolymer [density 0.867 g / cm 3, melt index (190 ° C., 2.16 kg) 2.9 g / 10 min] 10 wt%, C) 200 ppm peroxide was kneaded to prepare a polypropylene block copolymer resin composition having a melt index of 4.7 g / 10 min. The processability of the said resin composition and the physical property of the film manufactured by this resin composition were evaluated, and the result is shown in Table 2.

Example  3

As shown in Table 1, A) polypropylene block copolymer [melt index (230 ° C., 2.16 kg) 2.0 g / 10 min] 95 wt%, B) propylene-ethylene random copolymer [density 0.867 g / cm 3, melt index (190 ° C., 2.16 kg) 2.9 g / 10 min] 5 wt%, C) 300 ppm peroxide was kneaded to prepare a polypropylene block copolymer resin composition having a melt index of 6.1 g / 10 min. The processability of the said resin composition and the physical property of the film manufactured by this resin composition were evaluated, and the result is shown in Table 2.

Example  4

As shown in Table 1, A) polypropylene block copolymer [melt index (230 ° C., 2.16 kg) 2.0 g / 10 min] 93 wt%, B) propylene-ethylene random copolymer [density 0.867 g / cm 3, melt index (190 ° C., 2.16 kg) 2.9 g / 10 min] 7 wt%, C) 300 ppm peroxide was kneaded to prepare a polypropylene block copolymer resin composition having a melt index of 6.0 g / 10 min. The processability of the said resin composition and the physical property of the film manufactured by this resin composition were evaluated, and the result is shown in Table 2.

Example  5

As shown in Table 1, A) polypropylene block copolymer [melt index (230 ° C., 2.16 kg) 2.0 g / 10 min] 90 wt%, B) propylene-ethylene random copolymer [density 0.867 g / cm 3, melt index (190 ° C., 2.16 kg) 2.9 g / 10 min] 10 wt%, C) 300 ppm peroxide was kneaded to prepare a polypropylene block copolymer resin composition having a melt index of 6.2 g / 10 min. The processability of the said resin composition and the physical property of the film manufactured by this resin composition were evaluated, and the result is shown in Table 2.

Example  6

As shown in Table 1, A) polypropylene block copolymer [melt index (230 ° C., 2.16 kg) 2.0 g / 10 min] 95 wt%, B) propylene-ethylene random copolymer [density 0.867 g / cm 3, melt index (190 ° C., 2.16 kg) 2.9 g / 10 min] 5 wt%, C) 500 ppm peroxide was kneaded to prepare a polypropylene block copolymer resin composition having a melt index of 7.9 g / 10 min. The processability of the said resin composition and the physical property of the film manufactured by this resin composition were evaluated, and the result is shown in Table 2.

Example  7

As shown in Table 1, A) polypropylene block copolymer [melt index (230 ° C., 2.16 kg) 2.0 g / 10 min] 90 wt%, B) propylene-ethylene random copolymer [density 0.867 g / cm 3, melt index (190 ° C., 2.16 kg) 2.9 g / 10 min] 10 wt%, C) 500 ppm peroxide was kneaded to prepare a polypropylene block copolymer resin composition having a melt index of 8.0 g / 10 min. The processability of the said resin composition and the physical property of the film manufactured by this resin composition were evaluated, and the result is shown in Table 2.

Comparative example  One

As shown in Table 1, A) polypropylene block copolymer [melt index (230 ° C., 2.16 kg) 2.0 g / 10 min] 98 wt%, B) propylene-ethylene random copolymer [density 0.867 g / cm 3, melt index (190 ° C., 2.16 kg) 2.9 g / 10 min] 2 wt%, C) 300 ppm peroxide was kneaded to prepare a polypropylene block copolymer resin composition having a melt index of 2.4 g / 10 min. The processability of the said resin composition and the physical property of the film manufactured by this resin composition were evaluated, and the result is shown in Table 2.

Comparative example  2

As shown in Table 1, A) polypropylene block copolymer [melt index (230 ° C., 2.16 kg) 2.0 g / 10 min] 85 wt%, B) propylene-ethylene random copolymer [density 0.867 g / cm 3, melt index (190 ° C., 2.16 kg) 2.9 g / 10 min] 15 wt%, C) 300 ppm peroxide was kneaded to prepare a polypropylene block copolymer resin composition having a melt index of 6.0 g / 10 min. The processability of the said resin composition and the physical property of the film manufactured by this resin composition were evaluated, and the result is shown in Table 2.

Comparative example  3

As shown in Table 1, A) polypropylene block copolymer [melt index (230 ° C., 2.16 kg) 2.0 g / 10 min] 93 wt%, B) propylene-ethylene random copolymer [density 0.867 g / cm 3, melt index (190 ° C., 2.16 kg) 2.9 g / 10 min] 7 wt%, C) 100 ppm peroxide was kneaded to prepare a polypropylene block copolymer resin composition having a melt index of 3.5 g / 10 min. The processability of the said resin composition and the physical property of the film manufactured by this resin composition were evaluated, and the result is shown in Table 2.

Comparative example  4

As shown in Table 1, A) polypropylene block copolymer [melt index (230 ° C., 2.16 kg) 2.0 g / 10 min] 93 wt%, B) propylene-ethylene random copolymer [density 0.867 g / cm 3, melt index (190 ° C., 2.16 kg) 2.9 g / 10 min] 7 wt%, C) 500 ppm peroxide was kneaded to prepare a polypropylene block copolymer resin composition having a melt index of 10.0 g / 10 min. The processability of the said resin composition and the physical property of the film manufactured by this resin composition were evaluated, and the result is shown in Table 2.

Comparative example  5

As shown in Table 1, A) polypropylene block copolymer [melt index (230 ° C., 2.16 kg) 2.0 g / 10 min] 93 wt%, B) propylene-ethylene random copolymer [density 0.867 g / cm 3, melt index (190 ° C., 2.16 kg) 2.9 g / 10 min] 7 wt% was kneaded to prepare a polypropylene block copolymer resin composition having a melt index of 3.0 g / 10 min. The processability of the said resin composition and the physical property of the film manufactured by this resin composition were evaluated, and the result is shown in Table 2.

As shown in Comparative Example 1, the impact strength and heat resistance were good when using 98% by weight of polypropylene block copolymer resin, 2% by weight of propylene-ethylene random copolymer resin and 300ppm peroxide, but peel strength after orange peel and sterilization was good. It can be seen that there is no improvement.

As shown in Comparative Example 2, the impact strength, heat resistance, orange peel and peeling strength after sterilization were not improved when using 85 wt% of polypropylene block copolymer resin, 15 wt% of propylene-ethylene random copolymer resin and 300 ppm of peroxide. It can be seen that.

As shown in Comparative Example 3, the use of 93% by weight of polypropylene block copolymer resin, 7% by weight of propylene-ethylene random copolymer resin and 100 ppm of peroxide showed good orange peel performance, but improved impact strength, heat resistance and orange peel. It can be seen that.

As shown in Comparative Example 4, the impact strength, heat resistance, orange peel and peeling strength after sterilization were not improved when using 93% by weight of polypropylene block copolymer resin, 7% by weight of propylene-ethylene random copolymer resin and 500 ppm of peroxide. It can be seen that.

As shown in Comparative Example 5, the impact strength, heat resistance, orange peel and peeling strength after sterilization were not improved when only 93% by weight of polypropylene block copolymer resin and 7% by weight of propylene-ethylene random copolymer resin were used. Can be.

However, as shown in Examples 1 to 7, the composition ratio of the polypropylene block copolymer, the propylene-ethylene random copolymer and the peroxide was adjusted to 90 to 95% by weight, 5 to 10% by weight, and 200 to 500 ppm, respectively. It can be seen that the strength, orange peel, heat resistance and peel strength after sterilization are improved.

As described in detail above, the present invention can provide a polypropylene block copolymer resin composition for films excellent in impact strength, appearance, orange peel property, and heat sealing property.

Resin composition division Polypropylene
Block copolymer
(weight%) peroxide
(ppm) Propylene-ethylene
Random copolymer
(weight%) Melt Index
(g / 10 min) Example 1 95 200 5 4.7 Example 2 90 200 10 4.7 Example 3 95 300 5 6.1 Example 4 93 300 7 6.0 Example 5 90 300 10 6.2 Example 6 95 500 5 7.9 Example 7 90 500 10 8.0 Comparative Example 1 98 300 2 2.4 Comparative Example 2 85 300 15 6.0 Comparative Example 3 93 100 7 3.5 Comparative Example 4 93 500 7 10.0 Comparative Example 5 93 0 7 3.0

Film properties division Impact strength
(g) Orange peel Heat resistance
Test Peel strength after sterilization
(N / 15mm) Example 1 4800 Good (not generated) Good (no deformation) 30 Example 2 4030 Good (not generated) Good (no deformation) 28 Example 3 5250 Good (not generated) Good (no deformation) 28 Example 4 5000 Good (not generated) Good (no deformation) 29 Example 5 4700 Good (not generated) Good (no deformation) 24 Example 6 5010 Good (not generated) Good (no deformation) 25 Example 7 4600 Good (not generated) Good (no deformation) 27 Comparative Example 1 4400 Occur Good (no deformation) 19 Comparative Example 2 3500 Occur Occurrence (deformation) 24 Comparative Example 3 3200 Good (not generated) Occurrence (deformation) 22 Comparative Example 4 3880 Occur Occurrence (deformation) 16 Comparative Example 5 2600 Occur Occurrence (deformation) 20

Claims (6)

In the polypropylene block copolymer resin composition, 90 to 95 weight percent of a crystalline polypropylene block copolymer comprising 85 to 99.5 weight percent propylene and 0.5 to 15 weight percent ethylene; 5-10 wt% of an amorphous or low crystalline ethylene-propylene random copolymer comprising 70-85 wt% of propylene; And Consists of 200-500ppm peroxide, The crystalline polypropylene block copolymer has a melting temperature of 150 ~ 165 ℃, the propylene portion of the propylene polypropylene block copolymer has an extreme viscosity of 2.0 ~ 3.0dl / g, the ethylene-propylene rubber portion has an extreme viscosity of 2.0 ~ 3.5 dl / g and C2 content of 40 to 70% by weight, the impact strength of the film produced by melt extrusion of the polypropylene block copolymer resin composition 4040 ~ 5250g, peel strength 24 ~ 30N / 15mm and the film Polypropylene block copolymer resin composition for packaging films, characterized in that no orange peel phenomenon occurs in the appearance. According to claim 1, wherein the crystalline polypropylene block copolymer polypropylene block air for packaging film, characterized in that the melt index is 1.0 ~ 5.0g / 10min, the melt index of the homo portion is 1.0 ~ 5.0g / 10min. Copolymer Resin Composition. The polypropylene block copolymer resin composition for packaging film according to claim 1, wherein the ethylene-propylene random copolymer has a density of 0.910 g / cm 3 or less and a melt index of 1 to 10 g / 10 min. The polypropylene block copolymer resin composition according to claim 1, wherein the peroxide is impregnated with polypropylene having a density of 0.95 to 1.10 g / cm 3 and a reaction temperature of 90 to 220 ° C. The polypropylene block copolymer resin composition for packaging film according to claim 1, wherein the polypropylene block copolymer resin composition has a melt index of 4.7 to 8.0 g / 10 min. A packaging film prepared by melt extruding the polypropylene block copolymer resin composition of any one of claims 1 to 5, wherein the impact strength of the film is 4030 ~ 5250g, the peel strength is 24 ~ 30N / 15mm and the appearance of the film Packaging film, characterized in that the orange peel phenomenon does not occur.