KR20190064341A - A mixture resin composition with high clarity and excellent mechanical resistance - Google Patents

Abstract

Disclosed are a mixed resin composition which satisfies both impact strength and transparency and a formed product produced by the same. The resin composition of the present invention includes: (A) 75-95 wt% of a blend of crystalline polypropylene and polyethylene-propylene copolymer (EPR) produced by adding 5 to 15 wt% of an olefin monomer mixture, consisting of 40 to 70 wt% of ethylene and 30 to 60 wt% of propylene, into a reactor together with 85 to 95 wt% of crystalline polypropylene and polymerizing the ethylene and the propylene; and (B) 5 to 25 wt% of polyethylene having a density of 0.90 to 0.94 g/cm^3.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a mixed resin composition having excellent transparency and mechanical properties,

The present invention relates to a mixed resin composition excellent in transparency and mechanical properties, and more particularly, to a mixed resin composition of a polyethylene / ethylene-propylene block copolymer having excellent impact resistance, rigidity and transparency.

In general, the polypropylene resin composition is lightweight and has excellent mechanical and mechanical properties at a price, and is widely used as an injection molded article or a film material. In recent years, the use of polypropylene products has been expanding to various fields where durability is required depending on the user's environment in a simple external finish material or a packaging material. Particularly, as products using polypropylene are becoming larger, products are becoming thinner in order to reduce weight of products. However, such a thin film has a problem that it is easily broken by an external impact, and in order to improve it, there is a demand for a polypropylene product having a high stiffness and a higher level of impact resistance. However, in the development of materials using polypropylene, the impact resistance and stiffness tend to be inversely proportional, and a composition having high impact resistance is inadequate as a transparent container material that is invisible in inverse proportion to transparency.

Thus, it is required to develop a material that can satisfy both the impact strength and transparency required when used as a film packaging material, a food storage container, or a small injection container.

Korean Patent No. 1598715 discloses an ethylene propylene block copolymer prepared by using 65 to 82% by weight of a propylene homopolymer and 18 to 35% by weight of an ethylene propylene rubber having an ethylene content of 25 to 50% by weight, (Blur, impact strength, heat bonding strength, appearance characteristics) of the polyethylene-propylene copolymer (EPR) and the control of the domain size.

Korean Patent No. 1444007 discloses a resin composition comprising an ethylene-propylene block copolymer and high-density polyethylene, which is produced using 80 to 90% by weight of a polypropylene homopolymer and 10 to 20% by weight of an ethylene propylene rubber, There is a problem that heat resistance and mechanical strength are not sufficient.

Disclosure of Invention Technical Problem [8] Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide a mixed resin composition which can satisfy both mechanical properties such as impact strength and transparency and a molded article produced therefrom.

(A) 5 to 15% by weight of a mixture of olefin monomers consisting of 40 to 70% by weight of ethylene and 30 to 60% by weight of propylene with 85 to 95% by weight of crystalline poly 75 to 95% by weight of a blend of a polyethylene-propylene copolymer (EPR) prepared by polymerizing ethylene and propylene with the above-mentioned crystalline polypropylene; And (B) 5 to 25% by weight of a polyethylene having a density of 0.90 to 0.94 g / cm ³ .

The Izod impact strength (23 占 폚, ASTM D256) of 13 kg 占 / m / cm or more and Izod impact strength (-10 占 폚, ASTM D256) of 5.0 kg cm 2 or more, Dupont impact strength (23 캜, ASTM D256) of 120 J or more, and Dupont impact strength (-10 캜, ASTM D256) of 70 J or more.

Also, the (b) polyethylene-propylene copolymer (EPR) has an average diameter of 100 to 500 nm.

The resin composition may further comprise at least one additive selected from the group consisting of an antioxidant, a catalyst neutralizing agent, a pigment, a dispersant, a lubricant, an antistatic agent, a UV stabilizer, a slip agent, an antiblocking agent and talc To provide a mixed resin composition.

In order to solve the above-mentioned problems, the present invention provides a molded article produced from the resin composition.

The molded article may be any one of a refrigerated container, a freezing container, a multipurpose container, an automobile interior / exterior material, a food packaging container, a bottle cap, a packaging film, a protective film, a decor sheet, a retort pouch, Thereby providing a molded article.

According to the present invention, a crystalline propylene homopolymer is polymerized in a stepwise manner with a specific amount of ethylene-propylene rubber (EPR) to control the optimum intrinsic viscosity ratio, and at the same time, A mixed resin composition of a polyethylene ethylene-propylene block copolymer having less fish-eye and excellent heat resistance, and satisfying transparency and impact resistance at the same time, and a molded article produced therefrom can be provided.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly explain the present invention, parts not related to the description are omitted, and similar parts are denoted by similar reference numerals throughout the specification.

(A) 5 to 15% by weight of a mixture of olefin monomers consisting of 40 to 70% by weight of ethylene and 30 to 60% by weight of propylene with 85 to 95% by weight of crystalline polypropylene, 75 to 95% by weight of a blend of the polyethylene-propylene copolymer (EPR) and the crystalline polypropylene prepared by polymerizing ethylene and propylene; And (B) 5 to 25% by weight of a polyethylene having a density of 0.90 to 0.94 g / cm ³ .

Hereinafter, each component constituting the present invention will be described in detail.

(A) an ethylene propylene block copolymer

(a) a crystalline propylene homopolymer

In the present invention, the crystalline propylene homopolymer is polymerized by injecting propylene alone in the polymerization reactor. The method of polymerizing the polymer is by a conventional method known in the art, and is not particularly limited in the present invention.

The crystalline propylene homopolymer is contained in an amount of 5 to 95% by weight in the total ethylene propylene block copolymer resin composition. When the content of the crystalline propylene homopolymer is less than 85% by weight, the crystallinity is lowered to deteriorate the heat resistance and the heat bonding property, and when it exceeds 95% by weight, the crystallinity increases sharply and the impact resistance is lowered.

(b) Polyethylene-propylene copolymer (EPR)

In the present invention, the polyethylene-propylene copolymer (EPR) is polymerized by simultaneously injecting ethylene and propylene, and after the crystalline propylene homopolymer is polymerized, it is continuously polymerized in the presence of the crystalline propylene homopolymer in the subsequent polymerization reactor . The polymerization method of the polyethylene-propylene copolymer (EPR) is by a conventional method known in the art, and is not particularly limited in the present invention.

In the present invention, the polyethylene-propylene copolymer (EPR) is continuously polymerized in the reactor after polymerization of the crystalline propylene homopolymer, and a part of the constituent material of the crystalline propylene homopolymer and the polyethylene-propylene copolymer (EPR) Is uniformly dispersed by the affinity of the two phases due to the same affinity with the propylene chain, thereby providing excellent transparency, minimizing the deterioration of the thermal bonding property, improving the impact resistance, and improving the impact resistance of the polyethylene (EPR) And orange peel generation can be suppressed.

Accordingly, in the present invention, the polyethylene-propylene copolymer (EPR) is contained in an amount of 5 to 15% by weight in the whole ethylene propylene block copolymer resin composition in order to balance physical properties such as impact strength, thermal adhesiveness, transparency and appearance. When the content of the polyethylene-propylene copolymer (EPR) is less than 5% by weight, impact strength is lowered. When the content is more than 15% by weight, thermal adhesiveness, transparency and appearance characteristics may be deteriorated.

The polyethylene-propylene copolymer (EPR) may have an ethylene content of 40 to 70% by weight, and preferably 45 to 60% by weight based on the total weight of the copolymer. When the ethylene content in the copolymer is less than 40% by weight, the amorphous portion improving the impact in the polymer block to be polymerized is reduced and the impact resistance property is decreased. When the ethylene content is more than 70% by weight, And the transparency or anti-whitening characteristics may be reduced due to interfacial peeling at the time of impact resistance.

The intrinsic viscosity (xylene solvent) of the solvent extract in the polyethylene-propylene copolymer (EPR) is preferably 0.5 to 2.5 dl / g. When the intrinsic viscosity is less than 0.5 dl / g, the size of the rubber component is small and the molecular weight of the rubber component is small, so that the impact characteristics may be deteriorated. When the intrinsic viscosity exceeds 2.5 dl / g, And transparency is deteriorated due to lowering of dispersibility, and a fish eye may occur. In addition, due to this aggregation phenomenon, the impact resistance at the fish eye part may be deteriorated.

Here, since the dispersion of the rubber is caused by the difference in viscosity between the crystalline propylene homopolymer and the polyethylene-propylene copolymer (EPR), the viscosity of the polyethylene-propylene copolymer (EPR) relative to the intrinsic viscosity of the crystalline propylene homopolymer The intrinsic viscosity (intrinsic viscosity of polyethylene-propylene copolymer (EPR) / intrinsic viscosity of crystalline propylene homopolymer) is preferably 0.5 to 1, and most preferably 0.7 to 0.8. Also, considering the viscosity difference, the polyethylene-propylene copolymer may be amorphous without crystallinity.

If the intrinsic viscosity ratio is less than 0.5, the molecular weight of the polymerized polyethylene-propylene copolymer (EPR) may be lower than that of the crystalline propylene homopolymer, which is a continuous phase, so that shock absorption may be difficult. The dispersed phase size of the polyethylene-propylene copolymer (EPR) may increase and the appearance characteristics may be deteriorated.

In the present invention, it is particularly preferable that the polyethylene-propylene copolymer (EPR) is finely dispersed in the crystalline propylene homopolymer with a particle size of 100 to 500 nm in average diameter. When the particle size of the polyethylene-propylene copolymer (EPR) is less than 100 nm, shock absorption and dispersion of the block copolymer may be difficult. When the particle size exceeds 500 nm, the occurrence of diffuse reflection of light is severe, .

The melt index (ASTM D1238, 230 DEG C / 2.16 kg, Melt Index, MI) of the ethylene propylene block copolymer resin composition composed of the crystalline propylene homopolymer and the polyethylene-propylene copolymer (EPR) 1 to 50 g / 10 min, preferably 1 to 10 g / 10 min. If the melt index is less than 1 g / 10 min, the resin flow characteristics in the extrusion process may be deteriorated and it may be difficult to maintain the above-mentioned intrinsic viscosity ratio at the optimum condition of 0.5 to 1, and if it exceeds 50 g / 10 min The molecular weight may be lowered and the impact resistance characteristic of the final product may be deteriorated.

The ethylene propylene block copolymer (A) described above may be contained in an amount of 75 to 95% by weight, preferably 80 to 95% by weight, more preferably 85 to 95% by weight, based on the total weight of the mixed resin composition. By weight, and most preferably 85 to 90% by weight.

(B) Polyethylene

In the present invention, the polyethylene may be polyethylene having a density of 0.90 to 0.94 g / cm ³ , preferably 0.91 to 0.94 g / cm ³ , and most preferably 0.91 to 0.92 g / cm ³ . When the density of the polyethylene is less than 0.90 g / cm ³ , miscibility with the ethylene propylene block copolymer is lowered to cause a large amount of fish eyes. When the density exceeds 0.94 g / cm ³ , the degree of improvement in the impact strength of the mixed resin may be insignificant have.

In the present invention, the polyethylene may have a melt index of 0.5 to 20 g / 10 min at 190 ° C and 2.16 Kg, preferably 1 to 15 g / 10 min. When the melt index is less than 1 g / 10 min, miscibility with the ethylene propylene block copolymer is lowered to cause a large amount of fish eyes. When the melt index exceeds 20 g / 10 min, the degree of improvement in impact strength of the mixed resin may be insignificant.

In addition, the molecular weight distribution of the polyethylene is preferably 10 or less, and when the molecular weight distribution is more than 10, a large amount of fish eyes may occur.

In the resin composition of the present invention, the polyethylene may be contained in an amount of 5 to 25% by weight, preferably 5 to 20% by weight, more preferably 5 to 15% by weight, and most preferably 10 to 15% May be included.

In the present invention, the method of polymerizing the polyethylene is by a conventional method known in the art, and is not particularly limited in the present invention.

May additionally contain additives or solvents known in the art within the scope of not detracting from the object of the present invention. For example, an antioxidant, a catalyst neutralizing agent, a pigment, a dispersant, a lubricant, an antistatic agent, a UV stabilizer, a slip agent, an anti-blocking agent, talc and the like may be added. The additive can be appropriately adjusted by those skilled in the art to the extent that the object of the present invention is not impaired.

There is no particular limitation on the method for producing the mixed resin composition according to the present invention. For example, the above-mentioned respective components and other additives may be kneaded, kneaded, rolled, Banbury mixer, Or the like, or a single screw / twin screw extruder, and then kneading the charged raw materials using the above devices.

The Izod impact strength (23 占 폚, ASTM D256) of the film of 60 占 퐉 in thickness prepared from the resin composition of the present invention may be 13 kg 占 cm m / cm or more, preferably 15 kg 占 / m / cm or more, 20 kg · cm / cm or more, and most preferably 23 kg · cm / cm or more.

The Izod impact strength (-10 캜, ASTM D256) of the film of 60 탆 in thickness prepared from the resin composition of the present invention may be 5.0 kg · cm / cm or more, preferably 6.5 kg · cm / cm or more, May be at least 8.0 kg · cm / cm, and most preferably at least 9.5 kg · cm / cm.

The Dupont impact strength (23 DEG C, ASTM D256) of the film of 60 mu m in thickness prepared from the resin composition of the present invention may be 120 J or more, preferably 130 J or more, more preferably 180 J or more, and most preferably 200 J or more have.

The film having a thickness of 60 mu m made of the resin composition of the present invention may have a Dupont impact strength (-10 DEG C, ASTM D256) of 70 J or more, preferably 80 J or more, more preferably 120 J or more, and most preferably 140 J or more .

The haze (ASTM D1003) of a 60 탆 thick film made of the resin composition of the present invention may be 33 or less, preferably 30 or less, more preferably 25 or less, and most preferably 20 or less.

The film having a thickness of 60 탆 made of the resin composition of the present invention may have a number of fish eyes evaluated by the following method of 10 or less, preferably 6 or less, more preferably 4 or less, Can be less than three.

[How to measure fish eye]

Light was transmitted through the molded film to detect unfiltered F / E, and F / E per standard area (600 cm ² ) was counted for a total inspection area of 1 m ² .

According to one embodiment of the present invention, there is provided a molded article produced using the mixed resin composition, wherein the molded article is molded by any method such as extrusion, blow molding, film molding, injection molding, or vacuum molding But is not limited thereto. The molded article may be, for example, a refrigerated container, a freezing container, a multi-purpose storage container, an automobile interior / exterior material, a food packaging container, a bottle cap, a packaging film, a protective film, a decor sheet, a retort pouch, no.

Example 1

Propylene was injected into the reaction apparatus and subjected to bulk polymerization to prepare a crystalline propylene homopolymer. In the following series of reaction apparatuses, a gas phase reaction is carried out in the presence of a crystalline propylene homopolymer, wherein the ethylene content in the polyethylene-propylene copolymer (EPR) is 60% by weight. When the polymerization amounts of the crystalline propylene homopolymer and the polyethylene-propylene copolymer (EPR) are adjusted to 93 wt% and 7 wt%, respectively, and the intrinsic viscosity ratio is 0.8, the crystalline propylene homopolymer and the polyethylene The propylene copolymer (EPR) flowability and dispersibility determine the domain size of these components. A kneaded ethylene propylene block copolymer having an average diameter of 100 to 200 nm in domain size of the crystalline propylene homopolymer and the polyethylene-propylene copolymer (EPR) was prepared.

10 wt% of polyethylene having a density of 0.91 g / cm ³ was melt-mixed into 90 wt% of the ethylene propylene block copolymer through a single-screw extruder roll to prepare a final mixed resin composition.

Example 2

The content of crystalline propylene homopolymer and polyethylene-propylene copolymer (EPR) in the polyethylene-propylene copolymer (EPR) was adjusted to 45% by weight in Example 1, and the content ratio of the crystalline propylene homopolymer and the polyethylene- , And the intrinsic viscosity ratio was adjusted to be 0.7, the mixed resin composition was prepared in the same manner as in Example 1.

Example 3

The content of crystalline propylene homopolymer and polyethylene-propylene copolymer (EPR) in the polyethylene-propylene copolymer (EPR) was adjusted to 45% by weight in Example 1, and the content ratio of the crystalline propylene homopolymer and the polyethylene- , And the intrinsic viscosity ratio was adjusted to 0.7, and 15 wt% of polyethylene having a density of 0.92 g / cm ³ and 85 wt% of an ethylene propylene block copolymer was melted and mixed through a single-screw extruder roll. A mixed resin composition was prepared in the same manner as in Example 1.

Comparative Example 1

The ethylene content in the polyethylene-propylene copolymer (EPR) was adjusted to 85% by weight in Example 1 and the content ratio of the crystalline propylene homopolymer to the polyethylene-propylene copolymer (EPR) was 90% by weight and 10% , And the intrinsic viscosity ratio was adjusted to 2.8, the ethylene propylene block copolymer was prepared in the same manner as in Example 1.

Comparative Example 2

The same procedure as in Example 1 was carried out except that 15 wt% of polyethylene having a density of 0.95 g / cm ³ was added to 85 wt% of an ethylene propylene block copolymer in Example 1, except that the polyethylene was melted and mixed through a single-screw extruder roll To prepare a mixed resin composition.

Comparative Example 3

The content of crystalline propylene homopolymer and polyethylene-propylene copolymer (EPR) in the polyethylene-propylene copolymer (EPR) was adjusted to 45% by weight in Example 1, and the content ratio of the crystalline propylene homopolymer and the polyethylene- , And the intrinsic viscosity ratio was 0.9, the ethylene propylene block copolymer was prepared in the same manner as in Example 1.

Comparative Example 4

The polymerization amount in each step was adjusted so that the domain size of the polyethylene-propylene copolymer (EPR) was 200-300 nm in average diameter in Example 1 and the intrinsic viscosity ratio was 0.7. The density of ethylene propylene block copolymer Ethylene propylene block copolymer was prepared in the same manner as in Example 1, except that 30 wt% of polyethylene having a density of 0.92 g / cm < ³ > was melted and mixed through a single-screw extruder roll.

Experimental Example

The phenolic antioxidant, the phosphate antioxidant and the calcium stearate as the catalyst neutralizing agent were added to the mixed resin composition prepared according to the above Examples and Comparative Examples, and the mixture was melt-mixed at 220 ° C through a twin-screw extruder and pelletized After preparing the resin composition, test specimens of the prepared compositions were prepared and analyzed and evaluated in the following manner. The results are shown in Table 1 below.

[Method of analyzing resin composition]

(1) Ethylene content: Ethylene content was measured using a 720, 740 cm ^-1 characteristic peak using an infrared absorption spectrum (FT-IR).

(2) Melting point (Tm): 10 mg of the test piece was pre-melted at 220 캜 for 5 minutes under a nitrogen gas atmosphere using a differential scanning calorimeter (trade name DSC, Perkin-Elmer Co.) Deg.] C to 40 [deg.] C at a heating rate of 5 [deg.] C / min. Thereafter, the temperature was raised at a heating rate of 5 DEG C / min, and the peak temperature of the maximum peak of the obtained melting endothermic curve was defined as the melting point (Tm). The melting point of indium (In) measured by using the above-described measuring apparatus at a heating rate of 5 占 폚 / min is 156.6 占 폚.

(3) Intrinsic viscosity ratio: The solvent extract of the polyethylene-propylene copolymer (EPR) (b) shows a component soluble in 150 ml of xylene solvent in 200 ml of 4 g of the polypropylene block copolymer, and the crystalline propylene- (a) represents a component that is not soluble in the xylene solvent. The intrinsic viscosity of each component was measured using a viscosity meter under a decalin solution at 135 ° C for the solvent extract obtained using the xylene solvent. The intrinsic viscosity ratio was calculated according to the following equation (1).

(4) Domain Size (EPR Domain Size): The cross section of the ethylene propylene block copolymer specimen was cut at low temperature, and the polyethylene-propylene copolymer (EPR) was selectively etched into the xylene solvent. The cross section of the coalescence was confirmed.

[Equation 1]

Intrinsic Viscosity Ratio = Intrinsic Viscosity of Polyethylene-Propylene Copolymer (EPR) (b) / Intrinsic Viscosity of Crystalline Propylene Copolymer (a)

[Property evaluation method]

(1) Melt index: Measured under a load of 2.16 kg at 230 占 폚 according to ASTM D1238.

(2) Degree of cloudiness: The degree of cloudiness of a 60 mu m film was measured according to ASTM D1003.

(3) Flexural modulus: measured according to ASTM D790 method.

(4) Izod and Dupont impact strength: measured at room temperature (23 ° C) and low temperature (-10 ° C) according to ASTM D256 method.

(5) Heat distortion temperature: Measured according to the ASTM D648 method.

(6) Poling dart impact strength: A 60 탆 film was measured according to the ASTM D4226 method.

(7) Heat-bonding strength: After laminating a polypropylene film (60 占 퐉), an aluminum foil (9 占 퐉), Nylon (15 占 퐉) and PET (12 占 퐉), the sheet was bonded for 1 second under a pressure of 2 kgf / . The formed film was cut into a width of 25 mm and the peel strength at a peel angle of 180 占 was measured at a peel rate of 200 mm / min at 23 占 폚.

8 fish eyes (F / E): by transmitting light to the film molding at a thickness 60㎛, were the non-permeate F / E detection (detecting), the reference area relative to the total scan area of 1m ² (600cm ²⁾ The F / E of the sugar was counted and quantified.

Referring to Table 1, according to the present invention, a crystalline propylene homopolymer is polymerized stepwise with a specific amount of a polyethylene-propylene copolymer (EPR) (EPR) to control the intrinsic viscosity ratio, It was confirmed that mixing of the polyethylene represented by the above-mentioned ethylene propylene block copolymer makes it possible to produce a mixed resin which has few fish eyes and satisfies both heat resistance and transparency and impact resistance at the same time.

On the other hand, when the content of ethylene in the polyethylene-propylene copolymer (EPR) was excessively excessive and the intrinsic viscosity ratio exceeded the specific range (Comparative Example 1), transparency of the resin composition remarkably decreased and fish eyes I could confirm. It was also confirmed that, when the density of the polyethylene (B) in the mixed resin composition was too high (Comparative Example 2), fish eyes were relatively large even when the fog and the impact strength were largely lowered. In addition, when the content of (B) polyethylene in the mixed resin was too high (Comparative Example 3), it was confirmed that the heat resistance remarkably decreased and fish eyes were largely generated.

The preferred embodiments of the present invention have been described in detail with reference to the drawings. 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 present invention as defined by the appended claims.

Therefore, 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. .

Claims (7)

(A) 5 to 15% by weight of a mixture of olefin monomers consisting of 40 to 70% by weight of ethylene and 30 to 60% by weight of propylene is fed into the reactor together with 85 to 95% by weight of crystalline polypropylene, 75 to 95% by weight of a blend of the polyethylene-propylene copolymer (EPR) and the crystalline polypropylene prepared by polymerizing the polypropylene; And
(B) 5 to 25% by weight of a polyethylene having a density of 0.90 to 0.94 g / cm ³ . The method according to claim 1,
The Izod impact strength (23 占 폚, ASTM D256) of 13 kg 占 / m / cm or more and the Izod impact strength (-10 占 폚, ASTM D256) of 5.0 kg 占 cm m / cm or more, Dupont impact strength (23 占 폚, ASTM D256) of 120 J or more, and Dupont impact strength (-10 占 폚, ASTM D256) of 70 J or more. The method according to claim 1,
Wherein the intrinsic viscosity ratio of the (b) polyethylene-propylene copolymer (EPR) to the crystalline propylene homopolymer (a) is 0.5 to 1.0. The method according to claim 1,
Wherein the (b) polyethylene-propylene copolymer (EPR) has an average diameter of 100 to 500 nm. The method according to claim 1,
Wherein the resin composition further comprises at least one additive selected from the group consisting of an antioxidant, a catalyst neutralizing agent, a pigment, a dispersant, a lubricant, an antistatic agent, a UV stabilizer, a slip agent, an antiblocking agent and talc Resin composition. A molded article made from the resin composition of any one of claims 1 to 5. The method according to claim 1,
Wherein the molded article is any one of a refrigerated container, a freezing container, a multipurpose container, an automobile interior and exterior material, a food packaging container, a bottle cap, a film for packaging, a protective film, a decor sheet, a retort pouch, .