Method for producing multilayer thin film and cosmetic container provided with multilayer thin film

Abstract

To provide a method for producing a multilayer thin film and a cosmetic container having the multilayer thin film.SOLUTION: A method for forming a multilayer thin film according to one embodiment of the present invention includes: forming a primer layer on a substrate selected from at least one of PET (polyethylene terephthalate), PETG (glycol-modified polyethylene terephthalate), PCTA, and PCTG; forming a transparent undercoat layer on the primer layer; forming an aluminum thin film layer on the undercoat layer; forming a soft and transparent intermediate coat layer on the aluminum thin film layer; and forming a top coat layer on the intermediate coat layer.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a multi-layer film and a cosmetic container comprising the multi-layer film. [Background technology]

[0002] Various thin films are formed on the surfaces of electronic products such as mobile phones and laptops, and cosmetic containers such as compacts and lipsticks to enhance their appearance. These thin films can have a glossy finish, such as glossy or semi-glossy, or can be transparent or colored. Furthermore, the thin films formed on the surfaces of electronic products or cosmetic containers can include a metal layer, which makes the product appear more luxurious. In particular, metal thin films are preferred for cosmetic containers, as they are required to improve consumer convenience and make the product appear more glamorous.

[0003] Conventional multilayer thin films containing metals have the problem of breaking due to their brittleness when dropped. It is understood that such breakage occurs because the metal thin film makes the product brittle. In particular, cosmetic containers are frequently dropped due to their characteristics, so there is an increasing need to address this issue. [Prior art documents] [Patent documents]

[0004] Republic of Korea Patent Registration No. 0753656 Summary of the Invention [Problem to be solved by the invention]

[0005] Therefore, the present invention has been devised to solve the above-mentioned problems, and an object of the present invention is to provide a method for forming an impact-resistant multilayer thin film and a cosmetic container equipped with a multilayer thin film.

[0006] Other objects of the present invention will become clearer on the basis of the following examples. [Means for solving the problem]

[0007] In order to achieve the above object, a method for producing a multilayer thin film according to one embodiment of the present invention includes the steps of forming a primer layer on at least one substrate selected from PET (polyethylene terephthalate), PETG (polyethylene terephthalate glycol), PCTA, and PCTG; forming a transparent undercoat layer on the primer layer; forming an aluminum thin film layer on the undercoat layer; forming a soft and transparent intermediate layer on the aluminum thin film layer; and forming a topcoat layer on the intermediate layer.

[0008] The method for forming a multi-layered thin film according to the present invention may include at least one of the following embodiments: For example, the aluminum thin film layer may have a color, and the topcoat layer may be made of a light-emitting material.

[0009] A cosmetic container with a multilayer thin film according to one embodiment of the present invention comprises a primer layer formed on a substrate, the primer layer being made of at least one selected from PET (polyethylene terephthalate), PETG (polyethylene terephthalate glycol), PCTA, and PCTG; a transparent undercoat layer formed on the primer layer; an aluminum thin film layer formed on the undercoat layer; a soft, transparent intermediate coat layer formed on the aluminum thin film layer; and a top coat layer formed on the intermediate coat layer.

[0010] Another embodiment of the present invention provides a cosmetic container with a multilayer thin film, which is made of at least one selected from PET (polyethylene terephthalate), PETG (glycolmodified polyethylene terephthalate), PCTA, and PCTG, and includes a primer layer formed on a substrate; an aluminum thin film layer formed on the primer layer; a soft, transparent intermediate coat layer formed on the aluminum thin film layer; and a top coat layer formed on the intermediate coat layer.

[0011] In the cosmetic container according to the present invention, the topcoat layer may have scratch resistance and chemical resistance. [Effects of the Invention]

[0012] According to the means for solving the problems of the present invention as described above, various effects can be expected, including the following: However, the present invention is not established unless all of the following effects are achieved.

[0013] The present invention can provide a method for forming an impact-resistant multilayer thin film and a cosmetic container equipped with the multilayer thin film. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a flowchart illustrating a method for forming a multilayer thin film in accordance with one embodiment of the present invention. [Figure 2] 1 is a cross-sectional view of a cosmetic container on which a multilayer thin film according to a first embodiment of the present invention is formed. [Figure 3] FIG. 4 is a cross-sectional view of a cosmetic container on which a multilayer thin film according to a second embodiment of the present invention is formed. DETAILED DESCRIPTION OF THE INVENTION

[0015] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the description with reference to the accompanying drawings, the same or corresponding components will be given the same reference numerals regardless of the drawing numbers, and duplicate descriptions thereof will be omitted.

[0016] Fig. 1 is a flow chart illustrating a method for forming a multilayer thin film according to one embodiment of the present invention, and Fig. 2 and Fig. 3 are cross-sectional views of a cosmetic container on which a multilayer thin film according to the first and second embodiments of the present invention is formed, respectively.

[0017] Referring to FIG. 1, a method for forming a multilayer thin film according to one embodiment of the present invention includes the steps of forming a primer layer 20 on a substrate 10 made of at least one selected from PET (polyethylene terephthalate), PETG (polyethylene terephthalate glycol), PCTA, and PCTG, which correspond to copolyesters; forming a transparent undercoat layer 30 on the primer layer 20; forming an aluminum thin film layer 40 on the undercoat layer 30; forming a soft, transparent intermediate layer 50 on the aluminum thin film layer 40; and forming a topcoat layer 60 on the intermediate layer 50.

[0018] The substrate 10 can be made of at least one selected from PET (polyethylene terephthalate), PETG (polyethylene terephthalate glycol), PCTA and PCTG, which correspond to copolyesters.

[0019] PET is a relatively dense polyester resin and a crystalline thermoplastic. It exhibits excellent thermal properties such as excellent creep strength and low moisture absorption, as well as excellent dimensional stability, resulting in high hardness, rigidity, and strength, as well as excellent sliding and abrasion resistance. PET also has good crack resistance, high transparency, and gloss.

[0020] PETG is a thermoplastic polyester that offers chemical resistance, durability, and moldability. It is a modified version of PET with added chemical properties at the molecular level that give it different chemical properties, making it stronger and more durable than PET, more impact resistant, and more suitable for high temperatures.

[0021] PCTG is a copolyester plastic material that can be molded into pipes or various profiles. The resulting products are hard, transparent, glossy, and easy to mold and process. In addition, PCTG has the advantages of excellent chemical resistance and impact resistance.

[0022] PCTA is a copolyester plastic material that has high transparency, excellent low-temperature toughness, high heat resistance, and excellent processability. PCTA also has the advantages of excellent chemical resistance, good printing, coloring, and electrolytic plating properties, and toughness that is more than three times higher than that of transparent ABS.

[0023] The substrate 10 can form a cosmetic container, particularly an outer casing of the cosmetic container. The cosmetic container can be a compact container, a jar-type container, a bottle-shaped container, a lipstick, a pumping container, etc. The present invention is not limited by the shape or use of the cosmetic container.

[0024] A primer layer 20 may be formed on the substrate 10. The primer layer 20 allows the aluminum metal layer 40 formed thereon to adhere well to the substrate 10. The primer layer 20 may be formed to a thin thickness on the nano level (e.g., 1 to 100 nm) and may be deposited using a plasma-assisted deposition method (ion-assisted) during vacuum deposition to exhibit hard film properties and enhance the adhesion of the undercoat layer 30 or aluminum metal layer 40 located thereon.

[0025] The undercoat layer 30 formed on the primer layer 20 is a layer formed to strengthen the adhesion of the aluminum metal layer 40, and this step can be omitted if necessary. The undercoat layer 30 has transparent properties and can be either matte or glossy.

[0026] The undercoat layer 30 can be made of a carbon-based compound having one or more applicable groups selected from a carboxyl group, a phosphate group, a silane group, an amine group, a hydroxyl group, an aldehyde group, a ketone group, an ether group, and a ketal group, and the molecular weight of the compound may be, but is not limited to, 100 to 10,000.

[0027] The aluminum thin film layer 40 can be formed to a nanometer-level thickness (e.g., 1 to 100 nm) and can be transparent or have a color such as gold or silver. The aluminum thin film layer 40 can be formed as a single layer of aluminum using an electron beam or resistance heating device in a vacuum evaporator. Vacuum deposition methods include physical vapor deposition (PVD) and chemical vapor deposition (CVD), and dual physical vapor deposition can be divided into evaporation, sputtering, and ion plating.

[0028] The aluminum thin film layer 40 has the advantages of being beautiful in color and less susceptible to color change due to atmospheric corrosion than other metals. Furthermore, the aluminum thin film layer 40 has the advantages of low density, ease of processing, corrosion resistance, and excellent thermal conductivity. The aluminum thin film layer 40 is exposed to the exterior of the cosmetic container, enhancing its aesthetic appeal with its color and luster.

[0029] The intermediate layer 50 may have a transparent property so that the aluminum thin film layer 40 can be observed from the outside. The intermediate layer 50 also serves to enhance adhesion between the upper layer 60 (described later) and the aluminum thin film layer 40. The intermediate layer 50 may have a luminous, semi-luminous, or non-luminous property and may have soft layer properties. The intermediate layer 50 also has scratch resistance and can protect the aluminum thin film layer 40 formed thereunder.

[0030] The conductive layer 50 can also be made of a carbon-based compound having one or more applicable groups selected from a carboxyl group, a phosphate group, a silane group, an amine group, a hydroxyl group, an aldehyde group, a ketone group, an ether group, and a ketal group, and the molecular weight thereof may be 100 to 10,000.

[0031] The topcoat layer 60 is a thin film formed on the intermediate layer 50, and serves to protect the aluminum thin film layer 40 by providing not only reliability reinforcement such as saltwater resistance, abrasion resistance, and scratch resistance, but also stain resistance (fingerprint resistance) and ease of cleaning. The topcoat layer 60 may have soft or hard properties and may have any of glossy, semi-glossy, or non-glossy properties.

[0032] The method for manufacturing a multilayer thin film according to this embodiment is characterized by the fact that it can enhance the impact resistance of a substrate 10 made of a material such as PET, PETG, PCTA, or PCAG by forming an intermediate coating layer 50 and a top coating layer 60 on an aluminum thin film layer 40. Conventional cosmetic containers made of PET have a problem in that only one coating layer is formed on an aluminum thin film layer, which can cause the substrate to break when subjected to impact, such as when dropped. The method for manufacturing a multilayer thin film according to this embodiment is designed to solve this problem and is characterized by the fact that it improves the drop resistance of the substrate 10 by forming an intermediate coating layer 50 and a top coating layer 60 on an aluminum thin film layer 40.

[0033] 2 and 3 are cross-sectional views of cosmetic containers on which multilayer thin films according to first and second embodiments of the present invention are formed, respectively.

[0034] Referring to FIG. 2, a primer layer 20, a base coat layer 30, an aluminum thin film layer 40, a middle coat layer 50, and a top coat layer 60 are formed on the base material 10 of the cosmetic container. The characteristics and forming methods of each of these thin film layers 20, 30, 40, 50, and 60 have been explained with reference to FIG. 1, so further explanation is omitted.

[0035] The cosmetic container with a multilayer thin film according to the first embodiment of the present invention forms a middle coat layer 50 and a top coat layer 60 on the aluminum thin film layer 40, thereby preventing the substrate 10, which is made of one of PET, PETG, PCTA, and PCTG and has the metallic aluminum thin film layer 40 formed on top, from being easily destroyed.

[0036] 3, the base material 10 of the cosmetic container does not include the primer layer 30, but instead includes a primer layer 20, an aluminum thin film layer 40, an intermediate coating layer 50, and a top coating layer 60. That is, the cosmetic container with a multilayer thin film according to the second embodiment has the aluminum thin film layer 40 formed on the primer layer 20, and the intermediate coating layer 50 and top coating layer 60 formed on top of that to prevent breakage due to brittleness.

[0037] Although the present invention has been described above with reference to one embodiment, it will be understood by those skilled in the art that various modifications and variations of the present invention can be made without departing from the spirit and scope of the present invention as set forth in the following claims.

Claims

1. forming a primer layer on at least one substrate selected from PET (polyethylene terephthalate), PETG (glycolmodified polyethylene terephthalate), PCTA, and PCTG; forming a transparent undercoat layer on the primer layer; forming an aluminum thin film layer on the undercoat layer; forming a soft and transparent intermediate coating layer on the aluminum thin film layer; forming a topcoat layer on the intermediate coat layer; A method for producing a multilayer thin film comprising:

2. The method for manufacturing a multilayer thin film according to claim 1 , wherein the aluminum thin film layer has a color.

3. 3. The method for manufacturing a multilayer thin film according to claim 1, wherein the topcoat layer is made of a photosensitive material.

4. a substrate formed of at least one selected from PET (polyethylene terephthalate), PETG (polyethylene terephthalate glycol), PCTA, and PCTG; a primer layer formed on the substrate; a transparent undercoat layer formed on the primer layer; an aluminum thin film layer formed on the undercoat layer; a soft, transparent intermediate coating layer formed on the aluminum thin film layer; A cosmetic container comprising a multilayer thin film including a topcoat layer formed on the intermediate coat layer.

5. a substrate formed of at least one selected from PET (polyethylene terephthalate), PETG (polyethylene terephthalate glycol), PCTA, and PCTG; a primer layer formed on the substrate; an aluminum thin film layer formed on the primer layer; a soft, transparent intermediate coating layer formed on the aluminum thin film layer; A cosmetic container comprising a multilayer thin film including a topcoat layer formed on the intermediate coat layer.

6. 6. A cosmetic container comprising a multilayer thin film according to claim 4 or 5, wherein the topcoat layer has scratch resistance and chemical resistance.

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