KR102631598B1 - Stickers for attaching portable electronic devices with excellent adhesiveness and durability - Google Patents

Abstract

The present invention relates to a sticker for attachment to portable electronic devices with excellent adhesiveness and durability. By including a coating layer on the surface, the sticker not only has excellent durability and aesthetics, but also has improved adhesiveness and can be used for a long period of time. Furthermore, it can exhibit excellent antibacterial effects against harmful microorganisms.

Description

Stickers for attaching portable electronic devices with excellent adhesiveness and durability}

The present invention relates to a sticker for attachment to portable electronic devices with excellent adhesiveness and durability. It not only has excellent durability and usability by including a coating layer on the surface, but also relates to a sticker for attachment to portable electronic devices that has excellent adhesiveness and can be used for a long time. .

A sticker is an object that is attached to a specific object and used to convey a message by exposing a design, image, or text to the user. It is generally printed on paper or cellophane, applied on the back with adhesive, and attached to the surface to be adhered. It applies.

The above stickers are often attached to various items that we use in our daily lives, such as bags, electronic devices such as mobile phones, tablet PCs, and laptops, cars, and bicycles, and are also used as a means of expression to show one's individuality. .

In existing stickers, a separate protective coating is often used on the top of the printing layer to protect the design, image, or text printed on the sticker. Specifically, in the case of previously used coatings, a method of applying a laminated coating to a paper-based printing layer is widely used. However, this method not only has a very weak protective function, but also interferes with the characteristics of electronic devices when attached to them and used. There are disadvantages inherent in many possible factors.

Accordingly, efforts to recognize and solve the above problems have continued. For example, the prior art, Republic of Korea Patent No. 10-1208355, can improve the visibility of the internal printed layer and prevent the internal printed layer from being damaged. Discloses a decorative sticker that can be used and a manufacturing method thereof.

Specifically, the prior art has a structural feature of combining an upper sticker unit having an upper coating layer, an internal printing layer formed on the bottom of the upper coating layer by a backside printing method, and an external decoration layer formed on the upper surface of the upper coating layer, to a lower sticker unit having an adhesive layer. Through this, not only can the visibility of the internal printed layer be improved, but the effect of preventing damage to the internal printed layer is disclosed. However, the multi-layer structure has the disadvantage of being less efficient during the production process, and even if the above structural features are used, damage to the internal printing layer cannot be sufficiently prevented. As the period of use increases, damage such as scratches or dents on the sticker surface may occur. There is a problem with the printing layer being damaged.

On the other hand, since stickers are used by being attached to the surface to be adhered, the adhesiveness of the sticker is one of the important factors. Accordingly, research has been actively conducted to improve the adhesion of stickers to the adhesive surface by appropriately adjusting the combination or amount of active ingredients of the adhesive composition that forms the adhesive layer in direct contact with the adhesive surface. However, many prior arts related to this only maintain a strong adhesive effect for a certain period of time after attaching the sticker, and there is a problem in that it is insufficient to show a strong adhesive effect even after a long period of time, and specifically, the adhesive attached to the adhered surface There was a problem that there was a limit to showing a strong long-term adhesive effect as the area lifted or bubbles were generated over time.

Meanwhile, as the use of portable electronic devices such as mobile phones and tablet PCs has recently become popular, various decorative stickers that can be attached to the surface of the portable electronic devices to express their individuality or style have been released.

However, in the case of decorative stickers attached to the surface of the portable electronic device, harmful microorganisms present on the surface of the sticker may have a harmful effect on the human body due to the influence of the usage environment where the portable electronic device is frequently held and used by the user. There is also a risk of infection problems caused by various infectious bacteria.

Accordingly, Republic of Korea Patent Publication No. 10-10-2022-0113013, which is a prior art related to a sticker showing an antibacterial effect, includes a base film coated on the lower surface with a water-soluble adhesive containing chrysanthemum flower extract; An antibacterial sticker against Solobacterium murei is disclosed that includes an adhesive layer containing a release paper attached to the bottom of the water-soluble adhesive, but the part showing the antibacterial effect is located on the lower surface of the base film, and is located on the outside of the sticker. There is a problem with the antibacterial effect against harmful bacteria existing on the surface.

Accordingly, it exhibits excellent durability to prevent damage to the internal printing layer even when scratched or nicked by the external environment, and not only maintains excellent adhesiveness for a long period of time even after the sticker is attached to the adhered surface, but also protects against harmful microorganisms. There is a need to develop stickers that can simultaneously exhibit excellent surface antibacterial effects.

KR 10-1208355 B1 KR 10-2022-0113013 A

The purpose of the present invention is to provide a sticker with excellent adhesiveness and durability.

Another object of the present invention is to provide a sticker that not only has excellent durability and aesthetics by including a coating layer on the surface, but also has improved adhesiveness and can be used for a long period of time.

Another object of the present invention is to provide a sticker for attachment to portable electronic devices that not only has excellent antibacterial effect but also has excellent grip when attached to the surface to be adhered.

In order to achieve the above object, a sticker with excellent adhesiveness and durability according to an embodiment of the present invention includes a base film layer 110; A printing layer 120 formed on the upper surface of the base film layer 110; A protective film layer 130 formed on the upper surface of the printing layer 120; And it may include an adhesive layer 100 formed on the lower surface of the base film layer 110.

The base film layer 110 is selected from the group consisting of polyvinyl chloride (PVC), polyethylene terephthalate (PET), acrylic resin, polycarbonate (PC), and mixtures thereof.

The protective film layer 130 is selected from the group consisting of polypropylene (PP), polyamide (PA), polystyrene (PS), ethylene vinyl acetate (EVA), and mixtures thereof.

The printing layer 120 may be printed using a printing method selected from the group consisting of screen printing, offset printing, glitter printing, foil printing, and silk printing.

The adhesive layer 100 is formed by coating the lower surface of the base film layer 110 with an adhesive composition containing an adhesion-enhancing monomer, a crosslinking monomer, a cohesion-enhancing monomer, an isocyanate-based curing agent, and purified water.

A pearl coating layer 200 may be additionally formed on the upper surface of the protective film layer 130.

The pearl coating layer 200 is coated with a coating composition containing a solvent, iron oxide-coated mica flakes, an acrylic resin, and a surfactant.

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

The term 'extract' used in this specification has a meaning commonly used in the art as a crude extract, but in a broad sense also includes fractions obtained by additional fractionation of the extract. In other words, plant extracts include not only those obtained using the above-described extraction solvent, but also those obtained by additionally applying a purification process. For example, fractions obtained by passing the extract through an ultrafiltration membrane with a certain molecular weight cut-off value, separation by various chromatographs (designed for separation according to size, charge, hydrophobicity, or affinity), etc. Fractions obtained through various purification methods are also included in the extract of the present invention.

The extract used in the present invention can be prepared in powder form by additional processes such as reduced pressure distillation and freeze drying or spray drying.

The term 'portable electronic device' used in this specification includes wearable electronic devices such as mobile phones, tablet PCs, laptops, and smart watches, but is not limited to the above examples. Electronic devices that can be carried by individuals are specifically restricted. That is not the case.

The embodiments introduced below are provided as examples so that the idea of the present invention can be sufficiently conveyed to ordinary practitioners. Accordingly, the present invention is not limited to the embodiments described below and may be embodied in other forms.

A sticker with excellent adhesiveness and durability according to an embodiment of the present invention includes a base film layer 110; A printing layer 120 formed on the upper surface of the base film layer 110; A protective film layer 130 formed on the upper surface of the printing layer 120; And it may include an adhesive layer 100 formed on the lower surface of the base film layer 110.

Specifically, the sticker of the present invention has the structural characteristic of being formed by sequentially stacking an adhesive layer 100, a base film layer 110, a printing layer 120, and a protective film layer 130 from the lower surface to the upper surface.

That is, based on the base film layer 110, an adhesive layer 100 is formed on the lower surface, and the sticker of the present invention can be attached to the surface to be adhered through the adhesive layer 100.

Meanwhile, a printing layer 120 is formed on the upper surface of the base film layer 110, and specific phrases, designs, characters, etc. for aesthetics or information delivery may be printed on the printing layer 120.

Meanwhile, a protective film layer 130 is formed on the upper surface of the printing layer 120, and the protective film layer 130 protects against physical and chemical damage that may occur during use of the object to which the sticker of the present invention is attached. It serves to protect the sticker.

Specifically, the sticker of the present invention may additionally include a release film layer on the lower surface of the adhesive layer 100. The release film layer is configured to protect the adhesive layer 100 until the actual sticker is attached. When a sticker is to be attached to the adhered surface, the release film layer is removed and the exposed adhesive layer 100 is attached to the adhered surface. It is attached and attached to the . As the release film layer, a variety of materials that are previously used as materials for release film layers for stickers can be used, and the materials are not particularly limited.

The base film layer 110 is selected from the group consisting of polyvinyl chloride (PVC), polyethylene terephthalate (PET), acrylic resin, polycarbonate (PC), and mixtures thereof.

but, The base film layer 110 is not limited to the above example, and is a material with properties such as gas barrier and moisture barrier for the long-term usability and attachment stability of the sticker of the present invention, and is used by those skilled in the art. It is defined to include all types of materials that can be used as the base film layer 110 of a self-sticker.

The protective film layer 130 is selected from the group consisting of polypropylene (PP), polyamide (PA), polystyrene (PS), ethylene vinyl acetate (EVA), and mixtures thereof.

The protective film layer 130 is a layer that contacts the outside by being laminated on the upper surface of the base film layer 110, and corresponds to the configuration that has the greatest influence on the durability of the sticker of the present invention. Accordingly, the protective film layer 130 is preferably formed of a material having strong durability.

Accordingly, the material of the protective film layer 130 to maintain the excellent durability of the sticker of the present invention is polypropylene (PP), polyamide (PA), polystyrene (PS), ethylene vinyl acetate (EVA), and mixtures thereof. It is a material selected from the group consisting of, and is preferably a polypropylene (PP) film layer, but is not limited thereto.

The printing layer 120 may be printed using a printing method selected from the group consisting of screen printing, offset printing, glitter printing, foil printing, and silk printing.

The printing layer 120 is formed on the upper surface of the base film layer 110, and specific phrases, designs, characters, etc. for aesthetics or information delivery may be printed on the printing layer 120. Specifically, the printing layer 120 contains letters (phrases) and designs. In a configuration in which characters, etc. are printed, in the sticker of the present invention, letters, designs, or characters of the meaning intended to be conveyed through the sticker are printed on the printing layer 120. The printing layer 120 for this purpose can be made of various materials that can be applied by those skilled in the art, such as paper.

Meanwhile, a method selected from the group consisting of screen printing, offset printing, glitter printing, foil printing, and silk printing can be used as a printing method for the letters (phrases), designs, characters, etc., but is limited to the printing method. It is not limited, and is not particularly limited as long as it is a method that can be applied by a person skilled in the art to print letters, designs, characters, etc. on the printing layer 120 of the present invention.

The adhesive layer 100 is formed by coating the lower surface of the base film layer 110 with an adhesive composition containing an adhesion-enhancing monomer, a crosslinking monomer, a cohesion-enhancing monomer, an isocyanate-based curing agent, and purified water.

As the adhesion enhancing monomer, at least one selected from butylacrylate, decyl acrylate, isopropyl acrylate, and 2-ethylhexyl acrylate is used.

As the cohesion enhancing monomer, at least one selected from methyl methacrylate and pentyl methacrylate is used.

Meanwhile, hydroxyethyl methacrylate is used as the crosslinking monomer.

Meanwhile, in the manufacturing process of the adhesive composition, an acrylic emulsion resin is used, and the acrylic emulsion resin has excellent weather resistance and oil resistance, and at the same time, as a constituent monomer, is active in copolymerization with other vinyl monomers, and has excellent polarity of the adherend and the inside of the adhesive layer. In consideration of stress reinforcement, it has the characteristic of containing both a hydroxyl group and a carboxyl group as a functional monomer.

These acrylate-based resins have an initial weight average molecular weight in the range of 200,000 to 800,000, preferably in the range of 300,000 to 600,000.

Meanwhile, as the isocyanate-based curing agent, at least one selected from isoprone diisocyanate, hexamethylene diisocyanate, and tolylene diisocyanate is used.

Since the isocyanate-based curing agent has excellent reactivity and has the property of performing crosslinking even at room temperature, it is three-dimensional by urea bonding with -OH or -COOH groups in the adhesive composition and -NCO groups in the crosslinking agent, thereby improving cohesion, heat resistance, and solvent resistance. , mechanical properties such as durability and environmental resistance can be improved.

More preferably, the adhesive composition contains 30 to 50 parts by weight of an adhesion-enhancing monomer, 30 to 50 parts by weight of a crosslinking monomer, 10 to 30 parts by weight of a cohesion-enhancing monomer, and 10 to 30 parts by weight of an isocyanate-based curing agent, based on 100 parts by weight of purified water. May include wealth.

In the case of the above weight range, the adhesive strength of the adhesive layer 100 of the present invention can be improved due to the synergistic effect of mixing the active ingredients contained in the adhesive composition, and through this, even if the sticker is attached to the surface to be adhered and maintained for a long period of time. It has the advantage of maintaining its adhesiveness. However, if the weight range is less than or exceeds the weight range, adhesiveness may not be maintained for a long period of time.

More preferably, the adhesive composition may further include a compound represented by Formula 1 and a compound represented by Formula 2:

[Formula 1]

[Formula 2]

here,

n, o and p are the same or different from each other and are each independently an integer from 1 to 10.

When the compound represented by Formula 1 and the compound represented by Formula 2 are additionally included as active ingredients of the adhesive composition, they are mixed with the monomer and curing agent contained in the adhesive composition to further improve the adhesive strength of the adhesive layer 100 of the present invention. This can improve the adhesive stability of the sticker of the present invention.

Specifically, the adhesive composition contains 30 to 50 parts by weight of an adhesion-enhancing monomer, 30 to 50 parts by weight of a crosslinking monomer, 10 to 30 parts by weight of a cohesion-enhancing monomer, and 10 to 30 parts by weight of an isocyanate-based curing agent, based on 100 parts by weight of purified water. , may include 5 to 10 parts by weight of the compound represented by Formula 1 and 5 to 10 parts by weight of the compound represented by Formula 2, and when within the above weight range, the desired adhesion stability can be maximized. There is. However, if the weight is outside the above range, the effect may be minimal.

A pearl coating layer 200 may be additionally formed on the upper surface of the protective film layer 130.

Specifically, when the pearl coating layer 200 is additionally formed on the upper surface of the protective film layer 130, the aesthetics can be improved by providing a colorful and diverse pearl effect to the sticker surface. Furthermore, by giving a fine uneven effect to the upper surface of the protective film layer 130, when the sticker of the present invention is attached to a portable electronic device and used, there is an advantage of improving the grip force or feeling of use when the user holds the electronic device. there is.

The pearl coating layer 200 is coated with a coating composition containing a solvent, iron oxide-coated mica flakes, an acrylic resin, and a surfactant.

The pearl is made from mica, a type of granite. Mica is translucent, which is why some of the light is reflected from the surface, and some is transmitted and then reflected. Because the color of visible light reflected from the surface appears as a complementary color to the transmitted color, 'pearl' reveals completely different colors depending on the viewing angle, just like a pearl. Recently, pearls have been developed and used in a variety of fields, including coloring industrial materials, cosmetics applied to food or skin, and permanent printing on plastic surfaces.

Specifically, the pearl coating layer 200 is a layer coated with a composition containing mica flakes coated with iron oxide, an acrylic resin, a solvent, and a surfactant.

When metal oxides, such as iron oxide, are coated on mica flakes, they produce a pearl-like luster or an interference color effect. The iron oxide is a compound of iron and oxygen, and in the present invention, iron trioxide or iron dioxide (Fe2O3) is preferable. It is widely produced naturally as hematite, and is a factor in the color of red soil. It is a reddish-brown powder, with a specific gravity of 4.5, a melting point of 1,550°C, and an oil absorption of 22%. It is quite stable against sunlight, air, moisture, heat, etc., and does not melt easily once heated. Meanwhile, in the past, it was made by baking iron sulfate, but recently, it is made using iron sulfate produced from waste liquid from the steel or plating industry. Depending on the manufacturing method, it varies from red to yellow, brown, purple, black, etc. The reasons for the difference in color include the size of the particles, the type of contaminants, and the integrity of the crystal lattice. Industrially, it is used as a red pigment called Bengala or as an abrasive for glass, precious metals, and diamonds. Meanwhile, those with high purity are used as semiconductors and as raw materials for magnets and magnetic tapes.

In the present invention, iron oxide is coated on mica flakes with a thickness of 10 to 50 nm. The interference color effect varies depending on the thickness of the metal oxide layer, and the interference color effect is most noticeable in an iron oxide coating layer of the above thickness.

Meanwhile, the median particle size of the mica flakes in the pearl coating layer 200 is 700 μm to 900 μm.

Additionally, the viscosity of the coating composition used for the pearl coating layer 200 is preferably 300 cps to 500 cps.

Meanwhile, the central particle size of the mica flakes in the pearl coating layer 200 is somewhat large and the viscosity is low, so the pearl effect and surface micro-concavo-convex effect are good, but sedimentation of the mica flakes may occur, and to prevent this, a surfactant is used. Add .

By adding the surfactant, the interface of the synthetic mica becomes charged, so that submicron particles that overlap each other or are attached to large particles are dispersed due to mutual repulsion, thereby preventing agglomeration between particles. In addition, it can enable smooth and stable adsorption by activating the interface of the synthetic mica substrate and the interface of the hydrated metal oxide that is hydrolyzed and adsorbed on the substrate. Specifically, in the present invention, an oil-soluble surfactant, which is an insoluble surfactant, is used.

Meanwhile, acrylic resin is used as the resin, and a highly volatile solvent can be used as the solvent to shorten the solidification time.

The solvent may be a compound selected from the group consisting of isopropyl alcohol, methanol, methyl ethyl ketone, trichloroethylene, and toluene, but is not limited to the above examples.

The surfactant includes polyglyceryl-10 diisostearate, polyglyceryl-2 laurate, and polyglyceryl-2 sesquicaprylate. , polyglyceryl-5 trioleate, polyglyceryl-10 dioleate, PEG-20 glyceryl triisostearate, PEG -8 isostearate (PEG-8 isostearate), PEG-8 glyceryl isostearate, PEG-20 glyceryl isostearate, PEG-15 A compound selected from the group consisting of PEG-15 glyceryl isostearate, polysorbate 60, and polysorbate 80 may be used, but is not limited to the above examples.

That is, the sticker of the present invention forms a pearl coating layer 200 coated with the coating composition on the upper surface of the protective film layer 130, which not only improves aesthetics due to the pearl effect, but also creates fine irregularities on the sticker surface. By providing this, the mechanical strength of the sticker surface can be improved, and usability, such as the user's grip feeling, can be improved by attaching the sticker to a portable electronic device.

Preferably, the coating composition may include 50 to 70 parts by weight of iron oxide-coated mica flakes, 20 to 40 parts by weight of an acrylic resin, and 20 to 40 parts by weight of a surfactant, based on 100 parts by weight of the solvent.

In the case of the above weight range, the aesthetics and usability of the pearl coating layer 200 can be improved due to the synergistic effect of mixing each active ingredient, and the mechanical strength is also improved. If it exceeds or falls below the above weight range, the effect may be minimal.

Preferably, the coating composition may further include a natural extract selected from the group consisting of P. minsom extract, P. chinensis extract, and mixtures thereof.

When the natural extract is additionally included as an active ingredient in the coating composition, the mechanical strength of the sticker surface can be further improved due to the synergistic effect of mixing the active ingredients contained in the natural extract, and the harmful substances present on the sticker surface can be further improved. It has the advantage of showing an antibacterial effect against microorganisms.

Specifically, the Smilacina dahurica Turcz. ex Fisch. & C. A. Mey. is a perennial herb of the monocot plant Liliaceae family, and is characterized by alternating leaves, 4 to 6 leaves arranged in two rows, and oval or long oval shapes. there is. Meanwhile, the flowers are white, bloom from June to July, and have the characteristic of blooming in racemes at the end of the main stem. In oriental medicine, it is mainly used to treat vomiting, anti-inflammatory, liver, intoxication, miscarriage, ripening, mucus, geumchang, restorative medicine, tetanus, sweating, pain relief, and stroke.

The Tilia ovalis is a dicotyledonous tree of the order Malvaceae, also called the Seonbongpi tree, and grows up to about 5m in height. It has the characteristic of growing star hairs (multi-branched, star-shaped hairs) on young branches, and the leaves are alternate, broadly egg-shaped, with pointed ends, and have a sub-heart shape. Meanwhile, wood is used as a material for crafts such as bowls, and tree bark is used to make babies. It is similar to the chalpi tree, but differs in that its fruit is egg-shaped. It is a species endemic to Korea and is widely distributed in North Hamgyong Province.

More preferably, the coating composition of the present invention may further include the above-mentioned natural extract, and specifically, it may include 5 to 10 parts by weight of Siberian snail extract and 5 to 10 parts by weight of P. chinensis extract based on 100 parts by weight of the solvent. You can.

When the coating composition includes a natural extract in the above weight range, the synergistic effect of mixing each active ingredient can maximize the antibacterial effect against harmful microorganisms present on the surface of the sticker, and the surface of the pearl coating layer 200 The iron oxide forming fine irregularities is mixed with the coated mica flakes to maximize the mechanical strength of the surface of the coating layer 200. Furthermore, aesthetics and usability can also be maximized.

However, if the natural extract is included in less than or more than the above weight range, there is a disadvantage that the desired effect may be minimal.

The extract may be extracted using any one selected from the group consisting of water, lower alcohols having 1 to 6 carbon atoms, sodium hydroxide solution, and mixtures thereof as an extraction solvent.

Specifically, the step of pulverizing dried minsomdae; leaching the pulverized material using an organic solvent; Leaching and drying the sample; Re-leaching the dried sample using an organic solvent; Leaching and drying the sample; Leaching using water; And including the step of leaching, the Minsomba extract can be obtained.

It may further include the step of fractionating the Minsom stalk extract extracted using the organic solvent using an organic solvent.

The method of preparing the extract may be a conventional extraction method in the art, such as ultrasonic extraction, leaching, and reflux extraction. Specifically, it may be an extract obtained by extracting a natural product from which foreign substances have been removed by washing and drying with water, an alcohol having 1 to 6 carbon atoms, or a mixed solvent thereof, or it may be an extract obtained by sequentially applying the solvents to the sample.

The reflux extraction method is based on 100 mL of alcohol having 1 to 6 carbon atoms, 10 to 30 g of pulverized natural product, a reflux time of 1 to 3 hours, and 50 to 100% of alcohol having 1 to 6 carbon atoms. More specifically, based on 100 mL of alcohol with 1 to 6 carbon atoms, 10 to 20 g of pulverized natural product, reflux time of 1 to 2 hours, and 70 to 90% of alcohol with 1 to 4 carbon atoms.

The leaching method is performed at 15 to 30° C. for 24 to 72 hours and 50 to 100% of alcohol with 1 to 6 carbon atoms. More specifically, at 20 to 25° C., for 30 to 54 hours, and 70 to 80% of alcohol having 1 to 6 carbon atoms.

The ultrasonic extraction method is performed at 30 to 50° C. for 0.5 to 2.5 hours and 50 to 100% alcohol with 1 to 6 carbon atoms. Specifically, at 40 to 50° C. for 1 to 2.5 hours and 70 to 80% of alcohol having 1 to 6 carbon atoms.

The extraction solvent can be used in an amount of 2 to 50 times, more specifically, 2 to 20 times the weight of the sample. For extraction, the sample may be left for 1 to 72 hours, more specifically, 24 to 48 hours for leaching in the extraction solvent.

After extraction, the extract can be fractionated by sequentially applying a new fractionation solvent. The fractionating solvent used during fractionation is at least one selected from the group consisting of water, hexane, butanol, ethyl acetic acid, ethyl acetate, methylene chloride, and mixtures thereof, and is preferably ethyl acetate or methylene chloride.

After obtaining the extract or fraction, additional methods such as concentration or freeze-drying can be used.

The present invention relates to a sticker for attachment to portable electronic devices with excellent adhesiveness and durability. By including a coating layer on the surface, the sticker not only has excellent durability and aesthetics, but also has improved adhesiveness and can be used for a long period of time. Furthermore, it can exhibit excellent antibacterial effects against harmful microorganisms.

Figure 1 schematically shows a cross section of a sticker according to an embodiment of the present invention.
Figure 2 schematically shows a cross section of a sticker according to an embodiment of the present invention.
Figure 3 shows a sticker for attachment to a portable electronic device to which the sticker is applied according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail so that those skilled in the art can easily implement it. However, the present invention may be implemented in many different forms and is not limited to the embodiments described herein.

1. Manufacturing example

(1) Preparation of adhesive composition

Adhesion-enhancing monomer (butylacrylate), crosslinking monomer (hydroxyethyl methacrylate), cohesion-enhancing monomer (methyl methacrylate), isocyanate-based curing agent (hexamethylene diisocyanate), a compound represented by the following formula (1), The compound represented by the following formula (2) was mixed with purified water and heated at a temperature of 75°C for 15 minutes. Thereafter, the adhesive composition was prepared by stirring in a homogenizer at 11,000 rpm for 5 minutes. Meanwhile, each of the above compounds was purchased from Tokyo Chemical Company and used:

[Formula 1]

[Formula 2]

here,

n is 5, o and p are 8.

Meanwhile, the specific content of each compound used to prepare the adhesive composition is shown in Table 1 below.

T1 T2 T3 T4 T5 T6 T7 T8 T9 T10 Purified water 100 100 100 100 100 100 100 100 100 100 Adhesion Enhancing Monomer 25 30 40 50 55 40 40 40 40 40 crosslinking monomer 25 30 40 50 55 40 40 40 40 40 Cohesion Enhancing Monomer 5 10 20 30 35 20 20 20 20 20 Isocyanate-based hardener 5 10 20 30 35 20 20 20 20 20 Compound represented by formula 1 - - - - - 3 5 7.5 10 12 Compound represented by formula 2 - - - - - 3 5 7.5 10 12

(Unit: parts by weight)

(2) Preparation of a coating composition coated on a pearl coating layer

After washing, drying, and pulverizing the cotton stalk, 70% ethanol (EtoH), an extraction solvent, was added at a ratio of 1:10 (w:v), then completely immersed, and the process was repeated 3 times for 3 hours while refluxing at 80°C. Extracted. The extract was Whatman No. 2 Filtered with filter paper. The filtrate was concentrated under reduced pressure at 60°C to prepare a powder sample, thereby preparing the Minsom stalk extract (SE). On the other hand, the Euphorbia tree extract (TE) was prepared in the same manner as the Minsomdae extract (SE).

The above-mentioned Minsom stalk extract (SE) and Euphorbiaceae extract (TE) were mixed with a solvent (isopropyl alcohol), iron oxide-coated mica flakes, acrylic resin, and surfactant (polyglyceryl-2 laurate), and incubated at 55°C. It was heated for 30 minutes. Afterwards, the coating composition was prepared by stirring at 15,000 rpm for 10 minutes.

Meanwhile, the weight range of each active ingredient included in the coating composition is shown in Table 2 below.

P1 P2 P3 P4 P5 P6 P7 P8 P9 P10 solvent 100 100 100 100 100 100 100 100 100 100 Mica flakes coated with iron oxide 45 50 60 70 75 60 60 60 60 60 acrylic resin 15 20 30 40 45 30 30 30 30 30 Surfactants 15 20 30 40 45 30 30 30 30 30 S.E. - - - - - 3 5 7.5 10 12 T.E. - - - - - 3 5 7.5 10 12

(unit weight)

2. Preparation of sticker of the present invention

(1) Example 1

A printing layer 120 was formed by pressurizing paper with a thickness of 0.05 mm on top of transparent polyvinyl chloride (PVC) with a thickness of 0.09 mm, which was the base film layer 110. A protective film layer 130 was formed by pressurizing polypropylene (PP) with a thickness of 0.05 mm on the upper surface of the printing layer 120. Thereafter, the T1 adhesive composition according to the manufacturing example was applied to the lower surface of the base film layer 110 and dried to form an adhesive layer 100 with a thickness of 100 μm. Afterwards, a release paper was attached to the surface of the adhesive layer 100 to manufacture the sticker of the present invention.

(2) Examples 2 to 10

Stickers of Examples 2 to 10 were manufactured using the same process as Example 1, except that T2 to T10 were used instead of T1 as the adhesive composition used in forming the adhesive layer 100.

(3) Examples 11 to 20

The coating compositions of P1 to P10 were applied to the upper surface of the protective film layer 130 of the Example 8 sticker, and then dried to prepare stickers of Examples 11 to 20 in which a pearl coating layer 200 was additionally formed. did.

3. Experimental example

(1) Adhesion stability evaluation

The stickers of Examples 1 to 10 were produced for attachment to the back of a cell phone.

After collecting 100 discarded cell phones, the Example 1 sticker was attached to the back of 10 cell phones. Meanwhile, in the same manner, the stickers of Examples 2 to 10 were attached to the back of 10 cell phones, respectively.

Meanwhile, the cell phone with each of the 100 stickers attached was placed in the chamber, the temperature was set to -40°C and maintained for 5 hours, then the temperature was raised to 40°C and maintained for 5 hours. After repeating the above process 10 times, the status of the sticker attached to the back of the taken out cell phone was visually checked.

Specifically, the number of cases of poor adhesion, such as peeling or lifting of the adhesive layer 100, was confirmed, and the results are shown in Table 3 below.

Number of cases where sticker adhesion defects occurred Example 1 7 Example 2 5 Example 3 5 Example 4 5 Example 5 7 Example 6 4 Example 7 One Example 8 0 Example 9 One Example 10 3

Referring to [Table 3], it was confirmed that the sticker of the present invention exhibits excellent adhesive stability due to the adhesive composition contained in the adhesive layer 100.

In the case of Examples 2 to 4, it was confirmed that the adhesive stability was particularly excellent, and in the case of Examples 7 to 9, the effect was confirmed to be maximized.

(2) Antibacterial effect experiment

According to the KS 0693-1990 test method, 10 ¹⁰ animals were inoculated onto cotton and PET using Candida albicans as a strain, and the antibacterial level of the fabric was tested by treating the P1 to P10 compositions at a concentration of 500 μg/ml. Measured.

The results are shown in [Table 4] below. For objective comparison in [Table 4] below, the amount of microorganisms below 10 ³ is marked with ◎, the amount of microorganisms below 10 ⁴ is marked with ○, the amount of microorganisms below 10 ⁵ is marked with △, and the amount of microorganisms below 10 ⁸ is marked with ◎. Hereinafter, it is indicated with X.

antibacterial power P1 △ P2 ○ P3 ○ P4 ○ P5 △ P6 ○ P7 ◎ P8 ◎ P9 ◎ P10 ○

Referring to the results in [Table 4], it was confirmed that the compositions P1 to P10 of the present invention exhibit excellent antibacterial effects against harmful bacteria.

More specifically, it can be confirmed that P2 to P4 and P7 to P9 exhibit a more excellent antibacterial effect.

Through this, it can be seen that in Examples 12 to 14 and Examples 17 to 19, in which the pearl coating layer 200 was formed by applying the composition, the antibacterial effect against harmful microorganisms present on the sticker surface was particularly excellent.

(3) Evaluation of durability of sticker surface

To confirm the durability or mechanical strength of the sticker surface, the pencil hardness of the stickers of Examples 11 to 20 was measured.

Specifically, using Mitsubishi Pencil Uni, in accordance with the provisions of JIS K 5600-5-4, hold the pencil at an angle of about 45 degrees with respect to the surface of the sticker and extrude about 1 cm forward at about 1 cm/s to scratch. all. After each scratch, the tip of the pencil lead was ground and repeated five times with a pencil of the same hardness. The evaluation was conducted based on the maximum pencil hardness without scratches more than 3 out of 5 times.

[Indicators]

○: 2H

△: H

X: F or lower

The evaluation indices are the same as above, with 2H meaning the most excellent durability, and F or less meaning the worst durability.

The evaluation results are shown in [Table 5] below.

durability Example 11 X Example 12 △ Example 13 △ Example 14 △ Example 15 X Example 16 △ Example 17 ○ Example 18 ○ Example 19 ○ Example 20 △

Referring to [Table 5], it can be seen that when the pearl coating layer 200 is additionally included, the surface durability is particularly excellent. More specifically, in the case of Examples 17 to 19, it can be seen that the effect is maximized. .

In other words, it can be confirmed that when the coating layer 200 is formed with the P7 to P9 composition, the durability of the sticker surface is maximized.

Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements made by those skilled in the art using the basic concept of the present invention defined in the following claims are also possible. falls within the scope of rights.

100: Adhesive layer
110: base film layer
120: printing layer
130: protective film layer
200: Pearl coating layer

Claims (7)

base film layer;
A printing layer formed on the upper surface of the base film layer;
A protective film layer formed on the upper surface of the printing layer; and
It includes an adhesive layer formed on the lower surface of the base film layer,
A pearl coating layer is additionally formed on the upper surface of the protective film layer,
The pearl coating layer includes 50 to 70 parts by weight of iron oxide-coated mica flakes, 20 to 40 parts by weight of an acrylic resin, 20 to 40 parts by weight of a surfactant, and 5 to 5 to 10 parts by weight of a cottonwood extract, based on 100 parts by weight of a solvent. Coated with a coating composition containing 10 parts by weight and 5 to 10 parts by weight of Euphorbia tree extract.
Stickers with excellent adhesiveness and durability. According to paragraph 1,
The base film layer is selected from the group consisting of polyvinyl chloride (PVC), polyethylene terephthalate (PET), acrylic resin, polycarbonate (PC), and mixtures thereof.
Stickers with excellent adhesiveness and durability. According to paragraph 1,
The protective film layer is selected from the group consisting of polypropylene (PP), polyamide (PA), polystyrene (PS), ethylene vinyl acetate (EVA), and mixtures thereof.
Stickers with excellent adhesiveness and durability. According to paragraph 1,
The printing layer is printed using a printing method selected from the group consisting of screen printing, offset printing, glitter printing, foil printing, and silk printing.
Stickers with excellent adhesiveness and durability. According to paragraph 1,
The adhesive layer is formed by coating the lower surface of the base film layer with an adhesive composition containing an adhesion-enhancing monomer, a crosslinking monomer, a cohesion-enhancing monomer, an isocyanate-based curing agent, and purified water.
Stickers with excellent adhesiveness and durability. delete delete