KR102434725B1 - Non-pvc multilayer film - Google Patents

Abstract

In accordance with one embodiment of the present invention, a non-PVC multilayer film is provided. wherein the non-PVC multilayer film sequentially comprises a corona layer, a core layer and a sealant layer, wherein at least one of the corona layer and the core layer is formed from a composition comprising a propylene-ethylene block copolymer and a metallocene polyolefin. can be

Description

NON-PVC MULTILAYER FILM

The present invention relates to a non-PVC film, and more particularly to a non-PVC multilayer film formed from a composition comprising a propylene-ethylene block copolymer and a metallocene polyolefin to replace the PVC film.

PVC (Polyvinyl chloride) resin has been widely used in packaging materials because it is transparent, easy to color, easy to process due to heat deformation, does not burn easily, and is inexpensive.

However, when PVC is incinerated, chlorine-based chemicals that are harmful to the human body can be generated, and environmental hormones can be generated in large quantities. In addition, plasticizers are added to soft PVC, and these plasticizers are controversial about safety and may generate environmental hormones. In response to these problems, regulations on PVC resins are being strengthened at home and abroad.

Accordingly, various types of films that can replace the PVC resin have been developed, but it is difficult to develop a film having physical properties that can completely replace the PVC resin.

Therefore, there is a need for a non-PVC film that exhibits enough physical properties to replace a film using a PVC resin.

The present invention is to solve the above problems, and it is an object of the present invention to provide a non-PVC multilayer film that is formed from a composition comprising a propylene-ethylene block copolymer and a metallocene polyolefin, and can replace the PVC film. .

The technical problems of the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art from the following description.

In accordance with one embodiment of the present invention, a non-PVC multilayer film is provided. wherein the non-PVC multilayer film sequentially comprises a corona layer, a core layer and a sealant layer, wherein at least one of the corona layer and the core layer is formed from a composition comprising a propylene-ethylene block copolymer and a metallocene polyolefin. can be

Preferably, the metallocene polyolefin may be a metallocene polypropylene.

Also, preferably, at least one of the corona layer and the core layer may be formed from a composition comprising 60 to 80% by weight of the propylene-ethylene block copolymer and 20 to 40% by weight of the metallocene polypropylene. have.

Also, preferably, the weight ratio of the metallocene polypropylene to the propylene-ethylene block copolymer may be 7:3.

Also, preferably, the sealant layer may be formed from a composition including an alpha-olefin random copolymer and a metallocene polypropylene.

Also, preferably, the sealant layer may include 60 to 80 wt% of the alpha-olefin random copolymer and 20 to 40 wt% of the metallocene polypropylene.

Also, preferably, the weight ratio of the metallocene polypropylene to the alpha-olefin random copolymer may be 7:3.

Also, preferably, the thickness of the non-PVC multilayer film may be 200 to 400 μm.

In addition, preferably, a non-PVC multilayer film according to an embodiment of the present invention is applied, a cosmetic storage kit may be provided.

Also, preferably, the metallocene polyolefin may be a metallocene polyolefin elastomer.

Also, preferably, at least one of the corona layer and the core layer may include 60 to 80% by weight of the propylene-ethylene block copolymer and 20 to 40% by weight of the metallocene polyolefin elastomer.

Also, preferably, the weight ratio of the metallocene polyolefin elastomer to the propylene-ethylene block copolymer may be 7:3.

Also, preferably, the sealant layer may be formed from a composition comprising a propylene-ethylene block copolymer and a linear low-density polyethylene.

Also, preferably, the sealant layer may include 90 to 98% by weight of the propylene-ethylene block copolymer and 2 to 10% by weight of the linear low density polyethylene.

Also, preferably, the weight ratio of the linear low-density polyethylene to the propylene-ethylene block copolymer may be 95:5.

Also, preferably, the thickness of the non-PVC multilayer film may be 40 to 60 μm.

In addition, preferably, a non-PVC multilayer film according to an embodiment of the present invention is applied, a film for storing pills may be provided.

In accordance with one embodiment of the present invention, a method of manufacturing a non-PVC multilayer film is provided. The method for producing the non-PVC multilayer film includes (a) a composition for forming a corona layer, a composition for forming a core layer, and a composition for forming a sealant layer in a T-die multilayer extruder to co-extruded a multilayer film preparing a; (b) performing corona treatment on the prepared coextrusion multilayer film; and (c) taking up and winding up the corona-treated coextruded multilayer film, wherein the composition for forming at least one of the corona layer and the core layer is a propylene-ethylene block copolymer and a metallocene polyolefin may include

According to the present invention, a non-PVC multilayer film that can replace a PVC film with high transparency and excellent processability can be provided.

In addition, the non-PVC multilayer film according to the present invention can prevent whitening.

In order to more fully understand the drawings recited in the Detailed Description of the Invention, a brief description of each drawing is provided.
1 shows a cross-sectional view of a non-PVC multilayer film according to an embodiment of the present invention.
2 is a photograph of a cosmetic storage kit according to an embodiment of the present invention.
3 is a photograph of a film for storing pills according to an embodiment of the present invention.

Hereinafter, embodiments according to the present invention will be described with reference to the accompanying drawings. In adding reference numerals to the components of each drawing, it should be noted that the same components are given the same reference numerals as much as possible even though they are indicated on different drawings. In addition, in describing the embodiment of the present invention, if it is determined that a detailed description of a related known configuration or function interferes with the understanding of the embodiment of the present invention, the detailed description thereof will be omitted. In addition, although embodiments of the present invention will be described below, the technical spirit of the present invention is not limited thereto and may be variously implemented by those skilled in the art. On the other hand, for convenience described below, the up, down, left and right directions are based on the drawings, and the scope of the present invention is not necessarily limited to the direction.

Throughout the specification, when a part is "connected" with another part, it includes not only the case where it is "directly connected" but also the case where it is "indirectly connected" with another configuration in between. . Throughout the specification, when a part "includes" a certain component, it means that other components may be further included, rather than excluding other components, unless otherwise stated. In addition, in describing the components of the embodiment of the present invention, terms such as first, second, A, B, (a), (b), etc. may be used. These terms are only for distinguishing the elements from other elements, and the essence, order, or order of the elements are not limited by the terms.

The present inventors prepared a non-PVC multilayer film formed from a composition comprising a propylene-ethylene block copolymer and a metallocene polyolefin while conducting research to provide a film to replace the PVC film, and as a result, It was confirmed that a non-PVC multilayer film that can be substituted for a PVC film can be provided due to high transparency and processability, and the present invention was completed.

1 shows a cross-sectional view of a non-PVC multilayer film 100 , 200 in accordance with an embodiment of the present invention.

Referring to Figure 1, the present invention provides a non-PVC multilayer film (100, 200) comprising a corona layer (10, 40), a core layer (20, 50) and a sealant layer (30, 60) sequentially . At this time, for example, the corona layers 10 and 40 or the core layers 20 and 50 may each have two or more layers.

Corona treatment is performed on the surface of the corona layers 10 and 40 of the present invention, so that hydrophilicity and coating properties can be improved, and adhesion can be improved when other substrates are additionally adhered.

The corona layers 10 and 40 of the present invention may be formed from a composition including a propylene-ethylene block copolymer and a metallocene polyolefin.

The propylene-ethylene block copolymer may serve to improve impact strength while preventing whitening of the film. Preferably, the propylene-ethylene block copolymer has a melt index of 3.0 g/10min to 6.0 g/10min, a density of 0.87 g/cm3 to 0.93 g/cm3, and a heat deflection temperature of 105°C to 115°C. and, more preferably, the melt index of the propylene-ethylene block copolymer is 5.0 g/10min, the density is 0.90 g/cm3, and the heat deflection temperature may be 110° C., but is not limited thereto.

In the present invention, the metallocene polyolefin refers to a polyolefin prepared using a metallocene catalyst. For example, metallocene polyolefins include metallocene polyolefin elastomer (POE), metallocene polyolefin plastomer (POP), metallocene polyethylene (PE), and metallocene polypropylene. (Polypropylene, PP) and the like.

In one embodiment, the corona layer 10, 40 of the present invention may be formed from a composition comprising a propylene-ethylene block copolymer and metallocene polypropylene, and in another embodiment, the corona layer 10 of the present invention. , 40) may be formed from a composition comprising a propylene-ethylene block copolymer and a metallocene polyolefin elastomer. The hardness of the film may be adjusted by changing the type of the metallocene polyolefin forming the corona layers 10 and 40 .

The core layers 20 and 50 of the present invention are intermediate layers and connect the corona layers 10 and 40 and the sealant layers 30 and 60 to provide a thickness to the film.

The core layers 20 and 50 of the present invention may be formed from the same composition as the corona layers 10 and 40 of the present invention. For example, the core layers 20 and 50 of the present invention may be formed from a composition including a propylene-ethylene block copolymer and a metallocene polyolefin.

In one embodiment, the core layer 20, 50 of the present invention may be formed from a composition comprising a propylene-ethylene block copolymer and metallocene polypropylene, and in another embodiment, the core layer 20 of the present invention. , 50) may be formed from a composition comprising a propylene-ethylene block copolymer and a metallocene polyolefin elastomer. The hardness of the film may be adjusted by changing the type of the metallocene polyolefin forming the core layers 20 and 50 .

The sealant layers 30 and 60 of the present invention may be adhered to other film layers, and may serve as a coating layer.

The sealant layers 30 and 60 may be formed from one or more compositions selected from the group consisting of an alpha-olefin random copolymer, a metallocene polypropylene, a propylene-ethylene block copolymer, and a linear low density polyethylene. For example, the sealant layers 30 and 60 may be formed from a composition comprising an alpha-olefin random copolymer and a metallocene polypropylene, or may be formed from a composition comprising a propylene-ethylene block copolymer and a linear low density polyethylene. have. Components forming the sealant layers 30 and 60 may also be appropriately selected according to the hardness of the film.

The non-PVC multilayer film 100 and 200 of the present invention is formed by sequentially stacking the corona layers 10 and 40, the core layers 20 and 50 and the sealant layers 30 and 60, in this case, the corona layer (10, 40), a thickness ratio of the core layers 20 and 50 and the sealant layers 30 and 60 may be formed in a ratio of about 1:3:1, but is not limited thereto.

The non-PVC multilayer films 100 and 200 of the present invention appropriately control the components and content ratios of the compositions forming the corona layers 10 and 40, the core layers 20 and 50 and the sealant layers 30 and 60. By doing so, the hardness of the non-PVC multilayer films 100 and 200 can be variously implemented.

Hereinafter, embodiments of the present invention will be described in more detail.

Rigid Non-PVC Multilayer Film

According to one embodiment of the present invention, a rigid non-PVC multilayer film 100 is provided sequentially comprising a corona layer 10 , a core layer 20 , and a sealant layer 30 .

In the rigid non-PVC multilayer film 100 , the corona layer 10 may be formed from a composition comprising a propylene-ethylene block copolymer and a metallocene polypropylene. Preferably, the corona layer 10 may be formed from a composition comprising 60 to 80% by weight of a propylene-ethylene block copolymer and 20 to 40% by weight of a metallocene polypropylene, more preferably, propylene-ethylene It may be formed from a composition comprising 65 to 75 weight percent of a block copolymer and 25 to 35 weight percent metallocene polypropylene. The weight ratio of the metallocene polypropylene to the propylene-ethylene block copolymer may be 7:3, but is not limited thereto.

The metallocene polypropylene may serve to improve the strength and provide transparency while increasing the processability of the film. Specifically, the metallocene polypropylene may be a propylene homopolymer prepared with a metallocene catalyst. Preferably, the melt index of the metallocene polypropylene is 7.0 g/10min to 10.0 g/10min, and the density may be 0.87 g/cm ³ to 0.93 g/cm ³ , and more preferably, the melt index is 9.0 g/10min, and the density may be 0.90 g/cm ³ , but is not limited thereto.

In the rigid non-PVC multilayer film 100 , the core layer 20 may be formed of the same composition as the composition for forming the corona layer 10 . Preferably, the core layer 20 may be formed from a composition comprising 60 to 80% by weight of a propylene-ethylene block copolymer and 20 to 40% by weight of a metallocene polypropylene, more preferably a propylene-ethylene block 65 to 75 weight percent of the copolymer and 25 to 35 weight percent metallocene polypropylene. The weight ratio of the metallocene polypropylene to the propylene-ethylene block copolymer may be 7: 3, but is not limited thereto.

In the rigid non-PVC multilayer film 100 , the sealant layer 30 may be formed from a composition comprising an α-Olefin random copolymer and a metallocene polypropylene. Preferably, the sealant layer 30 may be formed from a composition comprising 60 to 80% by weight of an alpha-olefin random copolymer and 20 to 40% by weight of a metallocene polypropylene, more preferably, an alpha-olefin It may be formed from a composition comprising 65 to 75% by weight of a random copolymer and 25 to 35% by weight of a metallocene polypropylene. The weight ratio of the metallocene polypropylene to the alpha-olefin random copolymer may be 7:3, but is not limited thereto.

In one embodiment, the alpha-olefin random copolymer may serve to enable high temperature adhesion of the sealant layer. For example, the alpha-olefin random copolymer may be a propylene-ethylene random copolymer. Preferably, the melt index of the propylene-ethylene random copolymer is 6.0 to 25.0 g/10min, the melting point is 130 to 160 °C, and the density may be 0.88 to 0.94 g/cm3, more preferably, melt The index may be 7.0 g/10min, the melting point may be 142° C., and the density may be 0.91 g/cm3, but is not limited thereto.

For the metallocene polypropylene, for example, the same component as the metallocene polypropylene included in the corona layer 10 and the core layer 20 may be used.

The rigid non-PVC multilayer film 100 of the present invention may have a hardness such that the shape of the film may be momentarily deformed when the user presses the film, and is restored to the original shape when the pressure is released.

The rigid non-PVC multilayer film 100 may have a relatively thick thickness of about 200 to 400 μm.

The rigid non-PVC multilayer film 100 may be manufactured as a kit for fixing or storing solid objects such as household goods or cosmetics.

2 is a photograph of a cosmetic storage kit according to an embodiment of the present invention.

Referring to FIG. 2 , in one embodiment, the rigid non-PVC multilayer film 100 may be manufactured as a cosmetic storage kit. When using the rigid non-PVC multilayer film 100 as a cosmetic storage kit according to an embodiment of the present invention, it can be easily inserted into or separated from another packaging container by instantaneously deforming the shape. have. In addition, since it is restored to its original form after being accommodated in another packaging container, the contents can be stored stably.

Flexible Non-PVC Multilayer Film

According to an embodiment of the present invention, a flexible non-PVC multilayer film 200 is provided sequentially comprising a corona layer 40 , a core layer 50 , and a sealant layer 60 .

In the flexible non-PVC multilayer film 200, the corona layer 40 may be formed from a composition comprising a propylene-ethylene block copolymer and a metallocene polyolefin elastomer. Preferably, the corona layer 40 may be formed from a composition comprising 60 to 80% by weight of a propylene-ethylene block copolymer and 20 to 40% by weight of a metallocene polyolefin elastomer, more preferably, propylene-ethylene It may be formed from a composition comprising 65 to 75% by weight of a block copolymer and 25 to 35% by weight of a metallocene polyolefin elastomer. The weight ratio of the metallocene polyolefin elastomer to the propylene-ethylene block copolymer may be 7:3, but is not limited thereto.

The metallocene polyolefin elastomer may serve to impart elasticity to the film so that deformation may easily occur, and may provide transparency to the film. Specifically, the metallocene polyolefin elastomer may be a propylene-based polyolefin elastomer prepared with a metallocene catalyst. Preferably, the ethylene content of the metallocene polyolefin elastomer is 8 wt% to 20 wt%, and the melt index is 1.0 g/10min to 18.0 g/10min (more preferably, 1.0 g/10min to 5.0 g/min) 10min), and the density may be 0.86 g/cm3 to 0.89 g/cm3, more preferably, the ethylene content is 16% by weight, the melt index is 3.0 g/10min, and the density may be 0.862 g/cm3, but , but not limited thereto.

In the flexible non-PVC multilayer film 200 , the core layer 50 may be formed of the same composition as the composition for forming the corona layer 40 . Preferably, the core layer 50 may be formed from a composition comprising 60 to 80% by weight of a propylene-ethylene block copolymer and 20 to 40% by weight of a metallocene polyolefin elastomer, more preferably a propylene-ethylene block 65 to 75 weight percent of a copolymer and 25 to 35 weight percent of a metallocene polyolefin elastomer. The weight ratio of the metallocene polyolefin elastomer to the propylene-ethylene block copolymer may be 7:3, but is not limited thereto.

In the flexible non-PVC multilayer film 200, the sealant layer 60 may be formed from a composition comprising a propylene-ethylene block copolymer and linear low density polyethylene (LLDPE). Preferably, the sealant layer 60 may be formed from a composition comprising 90 to 98% by weight of a propylene-ethylene block copolymer and 2 to 10% by weight of a linear low density polyethylene, more preferably, a propylene-ethylene block copolymer. It may be formed from a composition comprising 93 to 97% by weight of a coal and 3 to 7% by weight of a linear low density polyethylene. The weight ratio of the linear low-density polyethylene to the propylene-ethylene block copolymer may be 95:5, but is not limited thereto.

The propylene-ethylene block copolymer may be, for example, the same as the propylene-ethylene block copolymer included in the corona layers 10 and 40 and the core layers 20 and 50, but is not limited thereto.

Linear low-density polyethylene can perform the function of improving the mechanical properties and heat-sealability of the film. Preferably, the linear low-density polyethylene has a melt index of 0.1 g/10min to 2.0 g/10min, a density of 0.91 g/cm3 to 0.94 g/cm3, and a softening point of 98°C to 109°C, more preferably may have a melt index of 1.0 g/10 min, a density of 0.922 g/cm 3 , and a softening point of 100° C., but is not limited thereto.

The flexible non-PVC multilayer film 200 of the present invention may have a shape fixed in the absence of an external force, and may have a hardness enough to be freely deformed or ruptured when a user applies an external force.

The thickness of the flexible non-PVC multilayer film 200 may be 40 to 60 μm, which may have a thinner thickness than that of the rigid non-PVC multilayer film 200 .

The flexible non-PVC multilayer film 200 can be made into a kit for storing or sealing relatively light and small objects, such as pills.

3 is a photograph of a film for storing pills according to an embodiment of the present invention.

Referring to FIG. 3 , in one embodiment, the flexible non-PVC multilayer film 200 may be fabricated as a pill storage film. According to an embodiment of the present invention, when the soft non-PVC multilayer film 200 is used as a film for storing pills, the pills are usually stored in the receiving unit (reference numeral not shown), and the receiving unit is pressed when using the pills. Thus, the pill can be discharged from the receiving unit by deforming the shape.

Method of making non-PVC multilayer film

In accordance with the present invention there is provided a method of making a non-PVC multilayer film. The method for producing a non-PVC multilayer film according to the present invention comprises (a) a composition for forming a corona layer, a composition for forming a core layer, and a composition for forming a sealant layer in a T-die multilayer extruder to form a ball preparing an extruded multilayer film; (b) performing corona treatment on the prepared coextrusion multilayer film; and (c) taking up and winding the corona-treated co-extruded multilayer film.

The method for producing a non-PVC multilayer film according to the present invention may include (d) aging the take-up and wound co-extrusion multilayer film for 48 hours to 96 hours.

The method for manufacturing a non-PVC multilayer film according to the present invention is a T-die multilayer extruder with a composition for forming a corona layer, a composition for forming a core layer, and a composition for forming a sealant layer to form a coextruded multilayer film. It includes a manufacturing step [(a) step], since the components and content of the composition for preparing the non-PVC multilayer film have been described above, redundant description will be omitted. On the other hand, the T-die multi-layer extruder may be set to known extrusion conditions.

In addition, the method for producing a non-PVC multilayer film according to the present invention includes the step [(b) step] of performing corona treatment on the prepared coextrusion multilayer film, wherein the corona treatment is performed on the corona layer according to a known method. can be performed on the surface of

In addition, the method for producing a non-PVC multilayer film according to the present invention includes the step of taking up and winding the corona-treated coextrusion multilayer film [(c) step], wherein the taking up and winding are performed according to a known method can be

Hereinafter, preferred examples are presented to help the understanding of the present invention. However, the following examples are only provided for easier understanding of the present invention, and the contents of the present invention are not limited by the following examples.

[Example]

Example 1: Rigid Non-PVC Multilayer Film

Propylene-ethylene block copolymer [Polymirae, melt index (@2.16kg, 230 ℃) (ASTM: D1238L) = 5.0 g/10min, density (ASTM: D1505) = 0.9 g/cm3, heat deflection temperature (ASTM: D648) = 110 ℃] 70% by weight and metallocene polypropylene [Lyondellbasell, melt index (@2.16kg, 230 ℃) (ASTM: D1238) = 9.0 g / 10 min, density (ASTM: D792) = 0.90 g / cm3, softening point (ASTM: D648) = 115° C.] 30% by weight was blended to prepare a composition for forming a corona layer and a core layer.

In addition, propylene-ethylene random copolymer [Hanwha Total, melt index (@2.16kg, 230 ℃) (ASTM: D1238) = 7.0 g/10min, melting point (HTC method) = 142 ℃, density (ASTM: D1505) = 0.91 g/cm3, softening point (ASTM: D648) = 95 °C] 70 wt% and metallocene polypropylene [Lyondellbasell, melt index (@2.16kg, 230 °C) (ASTM: D1238) = 9.0 g/10min, Density (ASTM: D792) = 0.90 g/cm 3 , softening point (ASTM: D648) = 115° C.] 30% by weight was blended to prepare a composition for forming a sealant layer.

The prepared compositions were put into a T-die multi-layer extruder (product name: 3-LAYER COEXTRUSION POLYCAST® LINE FOR THE PRODUCTION OF CPP AND CPE FILM, USEFUL WIDTH 2500~3000 MM-TYPE CFC/350F) and co-extruded multi-layer according to the manufacturer's protocol A film was prepared. This was cooled and solidified, and then corona-treated, taken up and wound up, and then aged for about 72 hours while omitting both longitudinal and transverse stretching, to prepare a 300 μm thick non-PVC multilayer film. At this time, the thickness ratios of the corona layer, the core layer, and the sealant layer were prepared to be 60 μm, 180 μm, and 60 μm, respectively.

ingredient content Composition for forming a corona layer Propylene-Ethylene Block Copolymer 70% by weight metallocene polypropylene 30% by weight Composition for forming a core layer Propylene-Ethylene Block Copolymer 70% by weight metallocene polypropylene 30% by weight Composition for forming a sealant layer Propylene-ethylene random copolymer 70% by weight metallocene polypropylene 30% by weight

Example 2: Flexible Non-PVC Multilayer Film

Propylene-ethylene block copolymer [Polymirae, melt index (@2.16kg, 230 ℃) (ASTM: D1238L) = 5.0 g/10min, density (ASTM: D1505) = 0.9 g/cm3, heat deflection temperature (ASTM: D648) = 110 ° C.] 70 wt % and metallocene polyolefin elastomer [ExxonMobil Chemical, ethylene content = 16 wt %, melt index (@2.16 kg, 230 ° C.) (ASTM: D1238) = 3.0 g/10 min, density ( @23°C, ASTM: D1505 variant) = 0.862 g/cm 3 , Vicat softening point 200 g (ASTM: D1525) = 53.9° C.] 30% by weight was blended to prepare a composition for forming a corona layer and a core layer.

In addition, propylene-ethylene block copolymer [Polymirae, melt index (@2.16kg, 230 ℃) (ASTM: D1238L) = 5.0 g/10min, density (ASTM: D1505) = 0.9 g/cm3, heat deflection temperature ( ASTM: D648) = 110 °C] 95 wt% and linear low density polyethylene [Hanwha Total, Melt Index (@2.16kg, 190 °C) (ASTM: D1238) = 1.0 g/10min, Density (ASTM: D1505) = 0.922 g /cm3, softening point 1kg (ASTM: D1525) = 100 ℃] 5% by weight was blended to prepare a composition for forming a sealant layer.

The prepared compositions were put into a T-die multi-layer extruder (product name: 3-LAYER COEXTRUSION POLYCAST® LINE FOR THE PRODUCTION OF CPP AND CPE FILM, USEFUL WIDTH 2500~3000 MM-TYPE CFC/350F) and co-extruded multi-layer according to the manufacturer's protocol A film was prepared. This was cooled and solidified, and then corona treated, taken up and wound, and then aged for about 72 hours while omitting both longitudinal and transverse stretching, to prepare a 60 μm thick non-PVC multilayer film. At this time, thickness ratios of the corona layer, the core layer, and the sealant layer were prepared to be 12 μm, 36 μm, and 12 μm, respectively.

ingredient content Composition for forming a corona layer Propylene-Ethylene Block Copolymer 70% by weight Metallocene Polyolefin Elastomers 30% by weight Composition for forming a core layer Propylene-Ethylene Block Copolymer 70% by weight Metallocene Polyolefin Elastomers 30% by weight Composition for forming a sealant layer Propylene-Ethylene Block Copolymer 95% by weight Linear Low Density Polyethylene 5% by weight

Performance evaluation of non-PVC multilayer films

The following performance evaluation was performed on the prepared non-PVC multilayer film.

(1) Evaluation of whitening resistance

For the non-PVC multilayer films prepared in Examples 1 and 2, the degree of whitening in the torn area was visually confirmed by scratching the film and pulling it on both sides, and the comparison results are shown in Table 3 below. ,

As shown in Table 3, in the case of Examples 1 and 2, whitening did not occur.

(2) Transparency evaluation

For the non-PVC multilayer films prepared in Examples 1 and 2 and the PVC films prepared in Comparative Examples 1 and 2, the degree of transparency of the film was visually checked, and the comparison results are shown in Table 3 below.

The score was evaluated on a 3-point scale, and the evaluation criteria are shown in Table 3.

As shown in Table 3, it was confirmed that the non-PVC multilayer films of Examples 1 and 2 had excellent transparency.

Example 1 Example 2 whitening resistance No bleaching No bleaching Transparency 2.6 2.8 (Transparent; 3: Transparent, 2: Translucent, 1: Opaque)

(3) Evaluation of film processability

A cosmetic storage kit was prepared using the rigid non-PVC multilayer film prepared in Example 1, and a photograph of the result is shown in FIG. 2 . In addition, a film for storing pills was prepared using the soft non-PVC multilayer film prepared in Example 2, and the result is shown in FIG. 3 .

As shown in Figure 2, the cosmetic storage kit produced using the rigid non-PVC multilayer film of Example 1 is processed to the same or superior level as that produced with a general conventional PVC film, and it is confirmed that it is molded into a cosmetic storage kit. could

In addition, as shown in FIG. 3, the pill storage film produced using the soft non-PVC multilayer film of Example 2 is processed to the same or superior level as those produced with a general conventional PVC film, and is molded into a pill storage film. could confirm that

As such, it can be confirmed that the non-PVC multilayer film of the present invention has excellent processability and moldability to be able to replace the conventional PVC film.

As described above, the best embodiment has been disclosed in the drawings and the specification. Although specific terms are used herein, they are used only for the purpose of describing the present invention and are not used to limit the meaning or scope of the present invention described in the claims. Therefore, it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible therefrom. Therefore, the true technical protection scope of the present invention should be determined by the technical spirit of the appended claims.

10, 40: corona layer 20, 50: core layer
30, 60: sealant layer 100, 200: non-PVC multilayer film

Claims (19)

A non-PVC film comprising:
sequentially comprising a corona layer, a core layer and a sealant layer,
At least one of the corona layer and the core layer is formed from a composition comprising a propylene-ethylene block copolymer and a metallocene polypropylene,
wherein the sealant layer is formed from a composition comprising 60 to 80% by weight of an alpha-olefin random copolymer and 20 to 40% by weight of a metallocene polypropylene. delete The method of claim 1,
At least one of the corona layer and the core layer,
A non-PVC multilayer film formed from a composition comprising 60 to 80% by weight of said propylene-ethylene block copolymer and 20 to 40% by weight of said metallocene polypropylene. The method of claim 1,
The non-PVC multilayer film, characterized in that the weight ratio of the metallocene polypropylene to the propylene-ethylene block copolymer is 7:3. delete delete The method of claim 1,
The non-PVC multilayer film, characterized in that the weight ratio of the metallocene polypropylene to the alpha-olefin random copolymer is 7:3. The method of claim 1,
The non-PVC multilayer film, characterized in that the thickness of the non-PVC multilayer film is 200 to 400 μm. A cosmetic storage kit to which the non-PVC multilayer film according to any one of claims 1, 3, 4, 7 and 8 is applied. A non-PVC film comprising:
sequentially comprising a corona layer, a core layer and a sealant layer,
wherein at least one of said corona layer and said core layer is formed from a composition comprising a propylene-ethylene block copolymer and a metallocene polyolefin elastomer. 11. The method of claim 10,
At least one of the corona layer and the core layer,
A non-PVC multilayer film comprising 60 to 80% by weight of the propylene-ethylene block copolymer and 20 to 40% by weight of the metallocene polyolefin elastomer. 11. The method of claim 10,
The non-PVC multilayer film, characterized in that the weight ratio of the metallocene polyolefin elastomer to the propylene-ethylene block copolymer is 7:3. 11. The method of claim 10,
wherein the sealant layer is formed from a composition comprising a propylene-ethylene block copolymer and a linear low density polyethylene. 14. The method of claim 13,
The sealant layer is
A non-PVC multilayer film comprising 90 to 98% by weight of said propylene-ethylene block copolymer and 2 to 10% by weight of said linear low density polyethylene. 14. The method of claim 13,
The non-PVC multilayer film, characterized in that the weight ratio of the linear low density polyethylene to the propylene-ethylene block copolymer is 95:5. 11. The method of claim 10,
The non-PVC multilayer film, characterized in that the thickness of the non-PVC multilayer film is 40 to 60 μm. 17. A film for storing pills to which the non-PVC multilayer film according to any one of claims 10 to 16 is applied. A method of making a non-PVC multilayer film, comprising:
(a) preparing a coextrusion multilayer film by introducing a composition for forming a corona layer, a composition for forming a core layer, and a composition for forming a sealant layer into a T-die multilayer extruder;
(b) performing corona treatment on the prepared coextrusion multilayer film; and
(c) taking up and winding the corona-treated coextrusion multilayer film,
The composition for forming at least one of the corona layer and the core layer comprises a propylene-ethylene block copolymer and a metallocene polypropylene,
wherein the sealant layer is formed from a composition comprising 60 to 80% by weight of an alpha-olefin random copolymer and 20 to 40% by weight of a metallocene polypropylene. A method of making a non-PVC multilayer film, comprising:
(a) preparing a coextrusion multilayer film by introducing a composition for forming a corona layer, a composition for forming a core layer, and a composition for forming a sealant layer into a T-die multilayer extruder;
(b) performing corona treatment on the prepared coextrusion multilayer film; and
(c) taking up and winding the corona-treated coextrusion multilayer film,
The composition for forming at least one of the corona layer and the core layer comprises a propylene-ethylene block copolymer and a metallocene polyolefin elastomer.

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