Adhesive acrylic emulsion paper tape with water-soluble silicone release coating and a method for manufacturing the same

Abstract

The present invention provides a paper tape in which a release coating layer is formed using an eco-friendly water-soluble silicone emulsion and an adhesive layer is formed using a water-soluble acrylic emulsion. Since the tape is easily decomposed in water after use and can be recycled, the recycling process of paper packaging materials can be simplified. Consequently, it can contribute to environmental protection by reducing the negative environmental impact compared to conventional tapes.

Description

Technology Field

[0001] The present invention relates to an adhesive acrylic emulsion paper tape with a water-soluble silicone release coating and a method for manufacturing the same, and is mainly applicable to fields related to packaging, industrial adhesives, and recyclable paper tapes. Background Technology

[0002] The background technology related to the present disclosure is provided herein, and these do not necessarily constitute known technology.

[0003] Conventional packaging paper tapes are primarily used for packaging, labels, and stickers, and are generally manufactured by applying a release coating layer and an adhesive layer onto kraft paper to prevent adhesive migration and protect the paper substrate. While the release agent used to form the release coating layer serves to prevent the adhesive from coming into direct contact with the paper surface, the process of using the release agent requires additional manufacturing steps, which leads to increased costs and reduced production efficiency. Furthermore, the release agent itself is generally difficult to separate due to its structure being unfavorable for recycling. Moreover, conventional release agents are primarily composed of environmentally harmful oily components that have a significant impact on the environment; therefore, failure to remove them can cause problems during the recycling process.

[0004] In particular, release coating layers do not decompose in water, posing a significant obstacle to the recycling process and causing negative environmental impacts. Conventional tapes often utilize water-insoluble polyethylene (PE) coatings or non-dissolving silicone coatings. While PE coatings are effective in enhancing the water resistance of kraft paper, they are difficult to separate from the paper during recycling because they do not decompose at all. Consequently, PE-coated paper is frequently classified as waste or incinerated during the recycling process. Similarly, non-dissolving silicone coatings also do not dissolve in water and maintain strong release properties, but they pose a problem during the recycling process. These coating layers remain as residues without reacting with water during recycling, making them difficult to separate.

[0005] To address these issues, various water-soluble coating technologies have been proposed; however, non-dissolving coatings such as silicone release layers or PE coatings remain widely used. Consequently, the recyclability of paper tape is inevitably limited. In particular, tapes used as packaging materials are not easily recycled due to their structure, requiring additional costs and resources for disposal. Therefore, new recyclable release agents and coating technologies are required.

[0006] Meanwhile, adhesive layers are primarily manufactured using organic solvent-based oil-based adhesives. While these adhesives provide high adhesion and durability, they cause various environmental problems. Oil-based adhesives contain harmful volatile organic compounds (VOCs), and these compounds can be released into the atmosphere during the manufacturing process, potentially causing environmental pollution. In particular, in the case of packaging paper tapes, the adhesive adheres strongly to the paper, making it cumbersome to remove the tapes individually during the recycling process, which incurs additional costs and time. Furthermore, these oil-based adhesives are not easily removed even after the paper tape is used, hindering the recycling of paper packaging materials. Consequently, recycling paper packaging requires either separate processing of the tape or the consumption of additional energy during the disposal process. In particular, conventional adhesive tapes contain components harmful to the environment, posing a problem of releasing hazardous gases upon incineration.

[0007] As an eco-friendly alternative to this, the use of paper tape instead of OPP (Oriented Polypropylene Film) adhesive tape is gaining attention. Regulations regarding the separate disposal of "cardboard and paper products" require the removal of coated paper or paper contaminated with foreign substances to prevent mixing with other paper products. However, paper tape also has release agents and adhesives coated on both the front and back sides, which do not dissolve in water during the recycling process and remain as foreign substances, thereby reducing recycling efficiency. For this reason, most paper tapes are disposed of as general waste, and promoting them as "100% recyclable" or "eco-friendly paper" simply because they use paper constitutes greenwashing. While tapes made from materials like kraft are commonly referred to as eco-friendly, a truly eco-friendly tape must be capable of being "recycled" or "repulped." However, conventional paper adhesive tapes cause environmental pollution upon disposal due to the coated resin components; furthermore, these resin components are insoluble, making recycling difficult, and incineration results in resource waste. These problems demonstrate that the use of paper tape cannot simply be an eco-friendly alternative.

[0008] Accordingly, the development of new technologies is required to increase the recyclability of paper tape and reduce environmental problems. The problem to be solved

[0009] The present invention aims to maximize recyclability and minimize negative environmental impacts by developing a paper tape incorporating a water-dissolvable silicone release agent. In particular, the present invention utilizes a water-dissolvable acrylic emulsion-based adhesive to enable the paper tape to easily dissociate in water after use, facilitating recycling, and also designs the silicone release layer to be water-dissolvable, thereby contributing to environmental protection.

[0010] In addition, the present invention provides a paper tape that exhibits high adhesive strength by using an eco-friendly water-based acrylic emulsion. In particular, the release agent and adhesive dissociate when exposed to water, making recycling easier, thereby simplifying the recycling process of paper packaging materials and contributing to environmental protection.

[0011] However, the objectives of the present invention are not limited to those mentioned above, and other unmentioned objectives will be clearly understood by those skilled in the art from the description below. means of solving the problem

[0012] The present invention provides a paper tape in which a release coating layer is formed on one side of a kraft paper using a release agent composition containing a water-soluble silicone emulsion, and an adhesive layer is formed on the other side using an adhesive composition containing a water-soluble acrylic emulsion.

[0013] In addition, the above-mentioned water-dissolvable silicone emulsion is an emulsion formed using a composition comprising silicone oil and a surfactant for release agent, wherein the silicone oil comprises one or more functional groups consisting of methacrylic groups, carbinol groups, and diamine groups, and the surfactant for release agent comprises a surfactant having an HLB (Hydrophilic Lipophilic Balance) value of 10 to 20.

[0014] In addition, the surfactant for the release agent comprises a nonionic surfactant and an anionic surfactant, wherein the nonionic surfactant comprises at least one selected from the group consisting of alcohol ethoxylates (AEs), fatty acid methyl ester ethoxylates (FAMEs), lauryl glucoside, and polyoxyethylene octylphenyl ether, and the anionic surfactant comprises one or more selected from the group consisting of sulfate-based surfactants sodium laurylsulfate (SLS), sodium lauryl ether sulfate (SLES), and linear alkylbenzene sulfonate (LABS).

[0015] In addition, the above-mentioned release coating layer is characterized by containing 1-ethynylcyclohexanol.

[0016] In addition, the above-mentioned hydrolytic acrylic emulsion is an acrylic emulsion formed using a composition comprising an acrylic monomer, a radical initiator, a buffer, a functional additive, a hygroscopic agent, a surfactant for adhesives, and a neutralizing agent, wherein the acrylic monomer comprises butyl acrylate, 2-ethylhexyl acrylate, vinyl acetate, and acrylic acid, the functional additive comprises polyvinyl alcohol (PVA) and ethyl alcohol, the hygroscopic agent comprises a polyhydroxyl aliphatic hydrocarbon, and the surfactant for adhesives comprises a nonionic linear surfactant and an anionic linear surfactant.

[0017] In addition, the acrylic monomer is characterized by comprising 50 to 150 parts by weight of 2-ethylhexyl acrylate, 10 to 50 parts by weight of vinyl acetate, and 10 to 100 parts by weight of acrylic acid, based on 100 parts by weight of butyl acrylate.

[0018] In addition, the present invention provides a method for manufacturing a paper tape characterized by applying a release agent composition containing the above-mentioned water-dissolvable silicone emulsion to one side of a kraft paper using a comma coating method, then drying and curing it first to form a release coating layer, and then applying an adhesive composition containing the above-mentioned water-dissolvable acrylic emulsion to the other side of a kraft paper using a comma coating method, then drying and curing it second to sequentially form an adhesive layer.

[0019] In addition, the present invention provides a method for manufacturing a paper tape characterized by simultaneously or continuously applying a release agent composition containing the water-dissolvable silicone emulsion and an adhesive composition containing the water-dissolvable acrylic emulsion to both sides of a kraft paper using a gravure coating method, and then drying and curing to simultaneously form a release coating layer and an adhesive layer on both sides of the kraft paper.

[0020] In addition, the weight of the above kraft base paper is 65~200 g / m² 2 And, when the thickness is 0.1 to 0.3 mm, the thickness of the release coating layer is 10 to 25 μm after drying and curing, and the thickness of the adhesive layer is 25 to 60 μm after drying and curing.

[0021] In addition, the machine equipment used for drying and curing is equipped with multiple rows from row 1 to row 6, with each row controlled to a different temperature, wherein the temperature of row 1 is 93~98℃, the temperature of row 2 is 105~110℃, the temperature of row 3 is 108~113℃, the temperature of row 4 is 103~108℃, and the temperature of row 5 is 95~100℃, and the passing speed is 10~30 m / min.

[0022] In addition, the method for manufacturing the paper tape further includes a process of aging after the drying and curing, and the aging process is characterized by being performed for 70 to 85 hours at a temperature of 20 to 60°C and a humidity of 20 to 40%.

[0023] In addition, the above-mentioned water-dissolvable silicone emulsion is characterized by being manufactured by including the steps of: mixing silicone oil and a surfactant for release agent at 25 to 30°C for at least 30 minutes, then slowly adding distilled water to adjust the initial pH to 5.5 to 6.5; forming an emulsion at 40 to 50°C for 30 to 60 minutes with high-speed stirring, and homogenizing the particle size using a high-pressure homogenizer; and cooling to 25°C or lower.

[0024] In addition, the above-mentioned water-dissolvable acrylic emulsion is characterized by being prepared by adding a radical initiator to a pre-emulsion prepared by mixing water, a surfactant for adhesives, and an acrylic monomer, adding a buffer and a functional additive to a reactor set at 79±3℃ within 3 hours by a dropping method, aging at 79±3℃ for 150 to 200 minutes, cooling to 40±3℃, carrying out a neutralization process using a neutralizing agent, and then adding and stirring a hygroscopic agent. Effects of the invention

[0025] The present invention forms a water-dissolvable silicone release coating layer by forming an emulsion using silicone oil and an emulsifier with a high HLB (hydrophilic-lipophilic balance) instead of conventional PE coatings or non-dissolvable silicone release agents, so that when the release coating layer comes into contact with water, it is easily separated due to the action of a surfactant, making it possible to recycle paper tape.

[0026] In addition, by composing an eco-friendly water-dissolvable adhesive layer based on a water-based acrylic emulsion with excellent adhesive strength, it has characteristics such as adhesive dissociation, provides excellent adhesive strength, and offers the effect of preventing deformation of the paper substrate, and can contribute to environmental protection through an eco-friendly production process. Brief explanation of the drawing

[0027] Figure 1 shows the composition of a paper tape according to an embodiment of the present invention. FIG. 2 shows a method for manufacturing a paper tape according to an embodiment of the present invention. FIG. 3 shows a mechanism for evaluating the adhesive strength of a tape according to an embodiment and a comparative example of the present invention. Specific details for implementing the invention

[0028] All technical and scientific terms used in this specification have the same meaning as generally understood by those skilled in the art, unless otherwise noted. Furthermore, throughout this specification and claims, unless otherwise noted, the terms "comprise," "comprising," and "comprising" mean including the mentioned items, steps, or groups of items and steps, and are not used to mean excluding any other items, steps, or groups of items or groups of steps.

[0029] Before describing the present invention in detail below, it should be understood that the terms used in this specification are intended only to describe specific embodiments and are not intended to limit the scope of the invention, which is limited solely by the appended claims.

[0030] Meanwhile, various embodiments of the present invention may be combined with any other embodiments unless explicitly stated otherwise. Any feature indicated as particularly desirable or advantageous may be combined with any other features and features indicated as desirable or advantageous. Hereinafter, embodiments of the present invention and the effects thereof will be described with reference to the accompanying drawings.

[0031] As shown in FIG. 1, a paper tape according to one embodiment of the present invention has a release coating layer formed on one side of a kraft paper using a release agent composition containing the water-dissolvable silicone emulsion, and an adhesive layer formed on the other side using an adhesive composition containing the water-dissolvable acrylic emulsion.

[0032] The above-mentioned release coating layer is formed using silicone oil and a silicone emulsion containing an emulsifier with a high HLB (hydrophilic-lipophilic balance), and the above-mentioned adhesive layer is formed using a water-dissolvable acrylic emulsion; since they can be easily separated due to the action of surfactants when in contact with water, efficient recycling is possible without additional processes.

[0033] The release agent composition forming the above release coating layer comprises a water-dissolvable silicone emulsion, and the water-dissolvable silicone emulsion is an emulsion formed using a composition comprising silicone oil and a surfactant for release agents.

[0034] The above silicone oil uses a silicone oil containing one or more functional groups composed of methacrylic groups, carbinol groups, and diamine groups. The methacrylic groups, carbinol groups, diamine groups, etc., affect the water affinity and cohesiveness of the silicone oil, and the methacrylic groups control reactivity, the carbinol groups control polarity, and the diamine groups control cohesiveness.

[0035] The surfactant for the release agent above is a surfactant having an HLB (Hydrophilic Lipophilic Balance) value of 10 to 20, and includes nonionic surfactants and anionic surfactants. If the HLB value is less than 15, the affinity for water is low, which may result in reduced water dissociability, reduced recyclability, and decreased stability of the emulsion; therefore, it is preferable to use a surfactant with an HLB value of 15 to 20. Additionally, if the HLB value is less than 17, it provides basic water dissociability by balancing between water and oil, but the dissociation rate is slow; and if the HLB value is greater than 19, it has very strong water solubility, so the dissociation rate is fast upon contact with water, but the release property may be weakened due to excessive water absorption; therefore, it is most preferable to use a surfactant with an HLB value of 17 to 19.

[0036] The above nonionic surfactant comprises at least one selected from the group consisting of alcohol ethoxylates (AEs), fatty acid methyl ester ethoxylates (FAMEs), lauryl glucoside (LG), and polyoxyethylene octylphenyl ether (POEOP), and the above anionic surfactant comprises one or more selected from the group consisting of sulfate-based surfactants sodium lauryl sulfate (SLS), sodium lauryl ether sulfate (SLES), and linear alkylbenzene sulfonate (LABS).

[0037] A surfactant having an HLB value of 10 to 20 can be used by mixing the above nonionic surfactant and anionic surfactant in a weight ratio of 60:40 to 80:20. For example, a surfactant having an HLB value of 10 can be used by mixing 70 wt% AEs and 30 wt% SLES; a surfactant having an HLB value of 13 can be used by mixing 50 wt% FAMEs, 20 wt% SLS, and 30 wt% POEOP; a surfactant having an HLB value of 15 can be used by mixing 20 wt% LG, 50% AEs, and 30 wt% LABS; a surfactant having an HLB value of 18 can be used by mixing 40 wt% POEOP and 60 wt% SLES; and a surfactant having an HLB value of 20 can be used by mixing 30 wt% AEs and 70 wt% LABS.

[0038] Preferably, a surfactant with an HLB value of 15 to 20 is used by mixing a nonionic surfactant and an anionic surfactant in a weight ratio of 70:30 to 30:70, and most preferably, a surfactant with an HLB value of 17 to 19 is used by mixing a nonionic surfactant and an anionic surfactant in a weight ratio of 35:65 to 45:55.

[0039] The water-dissolvable silicone emulsion formed by combining the above-mentioned surfactant for release agents and silicone oil provides superior recyclability compared to conventional silicone release agents or PE coatings. This emulsion is thinly and evenly distributed on the surface of the tape and maintains the release properties of silicone even after drying and curing, while the release layer easily dissociates due to the action of the surfactant when in contact with water. As a result, both the adhesive side and the release side of the tape are naturally separated and processed during the recycling process, enabling efficient recycling without additional processes.

[0040] The above silicone oil and surfactant for release agents are mixed in a weight ratio of 90:10 to 70:30 to control the balance of release properties and water dissociability. For example, when combined at a ratio of 90:10, release properties due to the characteristics of the silicone oil are enhanced while ensuring appropriate water dissociability. In addition, when combined at a ratio of 70:30, water dissociability due to the action of the surfactant is enhanced while maximizing recyclability.

[0041] The above method for preparing a water-dissolvable silicone emulsion comprises the steps of: mixing silicone oil and a surfactant for release agent at 25 to 30°C for at least 30 minutes, then slowly adding distilled water to adjust the initial pH to 5.5 to 6.5; forming an emulsion at 40 to 50°C for 30 to 60 minutes with high-speed stirring (500 to 1,000 rpm), and homogenizing the particle size to 0.2 to 1.0 μm using a high-pressure homogenizer at 500 to 1,000 bar; and cooling to 25°C or lower. The final emulsion has an HLB value of 10 to 20 and a pH of 5.5 to 6.5, and a uniform milky white liquid form of water-dissolvable silicone emulsion is obtained.

[0042] In addition, the release coating layer comprises 1-ethynylcyclohexanol. The 1-ethynylcyclohexanol is used as a crosslinking agent or for controlling adhesion with kraft paper, is included in the water-dissolvable silicone emulsion at 0.5 to 1 wt%, and is additionally mixed after the silicone emulsion is formed.

[0043] Meanwhile, the adhesive composition forming the adhesive layer includes a water-dissociable acrylic emulsion that maintains high adhesive strength while preventing water absorption deformation of the paper substrate, thereby minimizing environmental impact by using an eco-friendly water-based acrylic emulsion from the adhesive production process. In addition, the paper tape comprising the coating layer and the adhesive layer provides the effect of facilitating recycling, as the coating layer and the adhesive dissociate when exposed to water.

[0044] The above-mentioned water-dissociable acrylic emulsion is characterized in that it is an emulsion formed using a composition comprising an acrylic monomer, a radical initiator, a buffer, a functional additive, a hygroscopic agent, a surfactant for adhesives, and a neutralizing agent.

[0045] The above acrylic monomer comprises 50 to 150 parts by weight of 2-ethylhexyl acrylate, 10 to 50 parts by weight of vinyl acetate, and 10 to 100 parts by weight of acrylic acid, based on 100 parts by weight of butyl acrylate.

[0046] It is important that the above water-dissociable acrylic emulsion has a glass transition temperature of -50°C to -30°C, and it is important to appropriately select and combine butyl acrylate and 2-ethylhexyl acrylate monomers with low glass transition temperatures, vinyl acetate monomers with high glass transition temperatures, and crosslinkable acrylic acid monomers.

[0047] The above radical initiator comprises 0.5 to 1.5 parts by weight of sodium persulfate.

[0048] The above buffer contains 0.5 to 1.5 parts by weight of sodium bicarbonate.

[0049] The above functional additive comprises 50 to 100 parts by weight of polyvinyl alcohol (PVA) and 10 to 30 parts by weight of ethyl alcohol.

[0050] The above-mentioned hygroscopic agent comprises 40 to 80 parts by weight of a polyhydroxyl aliphatic hydrocarbon. The polyhydroxyl aliphatic hydrocarbon comprises at least one compound selected from the group consisting of propylene glycol, sorbitol, polyethyleneglycol, glycerin, urea, and lactic acid.

[0051] The surfactant for the adhesive above comprises 20 to 40 parts by weight of a nonionic surfactant and 30 to 50 parts by weight of an anionic linear surfactant. The preparation of the water-dissolvable acrylic emulsion is carried out by emulsion polymerization (reaction) of the acrylic monomers in the presence of a surfactant, and in the present invention, an environmentally friendly surfactant with high biodegradability was used.

[0052] In the present invention, a surfactant is used, and the nonionic linear surfactant comprises at least one compound selected from the group consisting of alcohol ethoxylates (AEs), fatty acid methyl ester ethoxylates (FAMEs), alkyl polyglucosides (APGs), and lauryl glucoside, and the anionic linear surfactant comprises at least one compound selected from the group consisting of linear alkylbenzene sulfonic acid (LABS), sodium lauryl sulfate (SLS), sodium lauryl ether sulfate (SLES), and linear alkyl sulfate (LAS).

[0053] The above neutralizing agent contains 1.5 to 2.5 parts by weight of ammonia water (Ammonium Hydroxide).

[0054] The above-mentioned water-dissolvable acrylic emulsion is manufactured to possess excellent characteristics of water dissolvability, water-active adhesiveness, and hygroscopicity by controlling viscosity with PVA, a water-soluble polymer, improving hygroscopicity with a polyhydroxy aliphatic hydrocarbon hygroscopic agent, using an emulsifier during emulsion polymerization, and completing the polymerization process with a cross-linked acrylic monomer.

[0055] The above method for preparing a water-dissociable acrylic emulsion involves mixing water, a surfactant, and an acrylic monomer to prepare a pre-emulsion, adding a radical initiator, and then introducing this into a reactor via a dropping method. A buffer and a functional additive are prepared in the reactor, and the temperature is set to 79±3℃; however, care must be taken during cooling, as a low temperature slows down the polymer reaction, while a high temperature can cause the reaction to become unstable and lead to boiling. The dropping process must be completed within 3 hours, after which the mixture is aged at 79±3℃ for 150 to 200 minutes and then cooled to 40±3℃. Once cooling is complete, a neutralization process is carried out using a neutralizing agent. After neutralization, a hygroscopic agent is added and stirred to finish the process.

[0056] The water-dissolvable acrylic emulsion according to the present invention has adhesive properties that are harmless to the human body and possesses the characteristic of dissolving in water. Therefore, when a paper tape having an adhesive layer formed using the eco-friendly water-dissolvable acrylic emulsion of the present invention is used for packaging paper products, such as packaging boxes, it adheres firmly to the packaging box and does not easily detach. By using base paper coated with the water-dissolvable acrylic emulsion that adheres to the packaging box in this manner, there is an advantage in that the paper tape adhered to the packaging box can be easily disposed of by dissolving it with water during the recycling process, without having to remove it individually from the packaging box after use.

[0057] The paper tape according to the present invention is manufactured by applying a release agent composition containing a water-soluble silicone emulsion to one side of a kraft paper using a comma coating method as shown in FIG. 2(a), forming a release coating layer by first drying and curing at various temperatures, applying an adhesive composition containing a water-soluble acrylic emulsion to the other side of a kraft paper using a comma coating method, and sequentially forming an adhesive layer by second drying and curing at various temperatures, and then aging at a certain temperature and time.

[0058] In addition, the paper tape according to the present invention is manufactured by applying a release agent composition containing the water-dissolvable silicone emulsion and an adhesive composition containing the water-dissolvable acrylic emulsion to both sides of a kraft paper simultaneously or continuously using a gravure coating method, as shown in FIG. 2(b), then drying and curing at various temperatures to simultaneously form a release coating layer and an adhesive layer on both sides of the kraft paper, and then aging at a certain temperature and for a certain period of time.

[0059] The machine equipment used for the above drying and curing is equipped with multiple rows from row 1 to row 5, and each row is controlled to a different temperature.

[0060] In rows 3, 4, and 5 of the machinery used for the above drying and curing, a process is carried out to dry the adhesive and form a solid. In row 2, if there is a sudden temperature fluctuation in the adhesive immediately after application, the adhesive may lift due to the vaporized colloidal dispersion medium; therefore, the temperature is managed to minimize fluctuations. The passage speed of the machinery is set to 10 to 30 m / min.

[0061] The above is characterized by the temperature of the first column being 93~98℃, the temperature of the second column being 105~110℃, the temperature of the third column being 108~113℃, the temperature of the fourth column being 103~108℃, and the temperature of the fifth column being 95~100℃.

[0062] The weight of the above kraft base paper is 65~200g / m² 2 In one characteristic, when the thickness is 0.1 to 0.3 mm, the thickness of the release coating layer is 10 to 25 μm after drying and curing, and the thickness of the adhesive layer is 25 to 60 μm after drying and curing.

[0063] The above aging is characterized by being carried out for 70 to 85 hours at a temperature of 20 to 60°C and a humidity of 20 to 40%.

[0064] The water-dissolvable acrylic emulsion according to the present invention contains hydrophilic polyhydroxyl aliphatic hydrocarbons that have the property of holding water, thereby preventing water absorption deformation of the paper substrate, and provides an eco-friendly effect from the production process by using a water-based acrylic emulsion adhesive.

[0065] The paper tape according to the present invention has an adhesive strength of 1000gf / 19mm or more and is suitable for use as a packaging tape. In addition, when exposed to water, the release agent and adhesive dissociate, making recycling easy.

[0066] Example 1 - Preparation of Hydrolyzable Silicone Emulsion

[0067] A silicone emulsion was prepared in the same manner by mixing silicone oil and a surfactant with the composition shown in Table 1 below. More specifically, the silicone oil and a release agent surfactant with the composition shown in Table 1 were mixed at 30°C for 40 minutes, and then distilled water was slowly added at a rate of 50 mL / min while adjusting the initial pH to 6.0. After forming the emulsion at 45°C at 800 rpm for 45 minutes, the particle size was homogenized to 0.5–0.7 μm using a homogenizer (700 bar). Subsequently, the mixture was cooled to below 25°C to obtain a uniform milky white liquid silicone emulsion with an HLB value of 10–20.

[0068] division ingredient Example 1-1 Examples 1-2 Examples 1-3 Examples 1-4 Examples 1-5 water Water 100 100 100 100 100 silicone oil Methacrylic group 5 5 5 5 5 Carbinol group 15 15 15 15 15 Diamine group 20 20 20 20 20 surfactants Alcohol Ethoxylates 7 5 3 Fatty Acid Methyl esters Ethoxylates 5 Lauryl Glucoside 2 Polyoxyethylene Octylphenyl Ether 3 4 Sodium Lauryl Sulfate 2 Sodum Lauryl Ether Sulfate 3 6 Linear Alkylbenzene 3 7 HLB 10.40 13.08 15.04 18.00 20.00

[0069] Example 2 - Preparation of Hydrolyzable Acrylic Emulsion

[0070] An acrylic emulsion was prepared by adding a radical initiator to a pre-emulsion prepared by mixing water, a surfactant, and an acrylic monomer with the composition shown in Table 2 below, and then introducing it into a reactor set at 80°C by a dropping method within 3 hours, aging it at 80°C for 3 hours, cooling it to 40°C, and carrying out a neutralization process using a neutralizing agent.

[0071] division ingredient Example 2-1 Example 2-2 Examples 2-3 Examples 2-4 Examples 2-5 water Water 400 400 400 400 400 acrylic monomer Butyl Acrylate 100 100 100 100 100 2-Ethylhexyl Acrylate 100 128 75 60 142 Vinyl Acetate 20 25 22 40 10 Acryl Acid 70 65 60 80 30 radical initiator Sodium Persulfate 1 1 1 1 1 buffer Sodium Bicarbonate 1 1 1 1 1 functional additives Poly Vinylalcohol 65 70 68 55 85 Ethyl Alcohol 15 18 17 27 23 desiccant Propyleneglycol 15 18 17 Sorbitol 20 15 20 Urea 22 Glycerin 21 11 11 Polyethyleneglycol 15 15 Lactic Acid 16 15 surfactants Alcohol Ethoxylates 20 21 21 Alkyl Polyglucosides 22 22 Lauryl Glucoside 21 20 Linear Alkylbenzene Sulfonate 35 35 Sodium Lauryl Sulfate 37 Sodium Lauryl Ether Sulfate 40 40 corrector Ammonium Hydroxide 2 2 2 2 2

[0072] Manufacturing Example - Paper Tape Manufacturing

[0073] A paper tape was manufactured by forming a release coating layer and an adhesive layer on both sides of a kraft paper using the emulsion prepared in the above example (comma coating method, sequential formation). The combinations of silicone emulsion and acrylic emulsion used to manufacture the paper tape are shown in Table 3 below, and all manufacturing processes except for the combinations were performed identically.

[0074] Preparation Example 1 Preparation Example 2 Preparation Example 3 Preparation Example 4 Preparation Example 5 Irregular layer Example 1-1 Examples 1-2 Examples 1-3 Examples 1-4 Examples 1-5 adhesive layer Example 2-1 Example 2-2 Examples 2-3 Examples 2-4 Examples 2-5

[0075] Experimental Example

[0076] (1) Suhaeriseong

[0077] The EL 103 test method evaluates the water dissociability of tapes and verifies the degree of dissociation or dissolution of the adhesive when the tape comes into contact with water. Tape samples cut to a specific size are prepared and completely submerged in a solution, and the test is conducted using a 0.5% sodium hydroxide solution prepared using distilled or purified water at room temperature. The tape is typically immersed in water for 30 minutes to 1 hour, and the water is gently stirred at regular intervals to promote dissociation. The test is performed at room temperature between 20°C and 25°C, and the degree of dissociation of the tape is observed over time. The results are classified as complete dissociation, partial dissociation, or non-dissociation based on the adhesive's floating or dissolved state in water and the presence of residue.

[0078] (2) Evaluation of adhesive strength and release properties

[0079] The ASTM D3330 test method is a standard test method for measuring the 180-degree peel strength of pressure-sensitive adhesive tapes (PSAs), and measurements were taken using the apparatus shown in Fig. 3. First, tape specimens to be used for the test are prepared in accordance with standard specifications. The width of the specimen is 40 mm, and the length is appropriately set to ensure a sufficient peel distance. The test plate is cleaned with a solvent to remove contaminants and dried to ensure a uniform surface condition. When attaching the tape to the test plate, care must be taken to prevent the formation of air bubbles or wrinkles, and it is compressed by reciprocating twice at a constant speed using a 2 kg roller. The roller speed is maintained at approximately 300 mm / min to ensure that pressure is applied evenly. After attaching the tape, it is stabilized for a certain period (20–40 minutes) under standard conditions (23°C, 50% relative humidity) to ensure uniform adhesion. To start the test, the test plate is secured to the lower clamp of the universal tensile testing machine, and the free end of the tape is firmly secured to the upper clamp. At this time, the test conditions are maintained consistently by positioning the tape and the test plate so that the angle between them is exactly 180 degrees. The test machine peels off the tape by moving the upper clamp at the speed specified in the standard (usually 300 mm / min or the speed according to the relevant standard). The force generated during the peeling process is recorded as 4-point data every 20 mm. Considering variations due to environmental conditions, the average value is calculated through repeated measurements at least 5 times.

[0080] Preparation Example 1 Preparation Example 2 Preparation Example 3 Preparation Example 4 Preparation Example 5 Release coating layer dissociation Partial dissociation (50%) Partial dissociation (75%) Partial dissociation (80%) Completely dissociated (>90%) Completely dissociated (>90%) dysplasia shortage excellence excellence Very excellent shortage Adhesive layer water dissociation Totally Harry Totally Harry Totally Harry Totally Harry Totally Harry Adhesion (gf / 19mm) 1,000~1,500 1,000~1,500 1,000~1,500 1,000~1,500 1,000~1,500

[0081] The features, structures, effects, etc. exemplified in each of the aforementioned embodiments may be combined or modified and implemented in other embodiments by a person skilled in the art to which the embodiments belong. Therefore, details regarding such combinations and modifications should be interpreted as being included within the scope of the present invention.

Claims

Claim 1 A paper tape having a release coating layer formed on one side of a kraft paper using a release agent composition containing a water-dissolvable silicone emulsion and an adhesive layer formed on the other side using an adhesive composition containing a water-dissolvable acrylic emulsion, wherein the water-dissolvable silicone emulsion is an emulsion formed using a composition containing silicone oil and a surfactant for a release agent, wherein the silicone oil includes a silicone oil containing one or more functional groups composed of a methacrylic group, a carbinol group, and a diamine group, and the surfactant for a release agent includes a surfactant having an HLB (Hydrophilic Lipophilic Balance) value of 10 to 20. Claim 2 A paper tape according to claim 1, wherein the surfactant for the release agent comprises a nonionic surfactant and an anionic surfactant, wherein the nonionic surfactant comprises at least one selected from the group consisting of alcohol ethoxylates (AEs), fatty acid methyl ester ethoxylates (FAMEs), lauryl glucoside, and polyoxyethylene octylphenyl ether, and the anionic surfactant comprises sulfate-based surfactants sodium lauryl sulfate (SLS), sodium lauryl ether sulfate (SLES), and linear alkylbenzene sulfonate (LABS). Claim 3 A paper tape according to claim 1, characterized in that the release coating layer comprises 1-ethynylcyclohexanol. Claim 4 A paper tape according to claim 1, wherein the water-dissociable acrylic emulsion is an acrylic emulsion formed using a composition comprising an acrylic monomer, a radical initiator, a buffer, a functional additive, a hygroscopic agent, a surfactant for adhesives, and a neutralizing agent, wherein the acrylic monomer comprises butyl acrylate, 2-ethylhexyl acrylate, vinyl acetate, and acrylic acid, the functional additive comprises polyvinyl alcohol (PVA) and ethyl alcohol, the hygroscopic agent comprises a polyhydroxyl aliphatic hydrocarbon, and the surfactant for adhesives comprises a nonionic linear surfactant and an anionic linear surfactant. Claim 5 A paper tape according to claim 4, characterized in that the acrylic monomer comprises 50 to 150 parts by weight of 2-ethylhexyl acrylate, 10 to 50 parts by weight of vinyl acetate, and 10 to 100 parts by weight of acrylic acid, based on 100 parts by weight of butyl acrylate. Claim 6 A method for manufacturing a paper tape according to claims 1 to 5, wherein a release agent composition containing the water-dissolvable silicone emulsion is applied to one side of a kraft paper using a comma coating method, followed by first drying and curing to form a release coating layer, and an adhesive composition containing the water-dissolvable acrylic emulsion is applied to the other side of a kraft paper using a comma coating method, followed by second drying and curing to sequentially form an adhesive layer, or wherein the release agent composition containing the water-dissolvable silicone emulsion and the adhesive composition containing the water-dissolvable acrylic emulsion are applied to both sides of a kraft paper simultaneously or sequentially using a gravure coating method, followed by drying and curing to simultaneously form a release coating layer and an adhesive layer on both sides of the kraft paper. Claim 7 In claim 6, the weight of the kraft base paper is 65 to 200 g / m² 2 A method for manufacturing a paper tape, characterized in that when the thickness is 0.1 to 0.3 mm, the thickness of the release coating layer is 10 to 25 μm after drying and curing, and the thickness of the adhesive layer is 25 to 60 μm after drying and curing. Claim 8 A method for manufacturing a paper tape according to claim 6, wherein the machine equipment used for drying and curing comprises a plurality of rows from row 1 to row 5, each row being controlled to a different temperature, the temperature of row 1 being 93~98℃, the temperature of row 2 being 105~110℃, the temperature of row 3 being 108~113℃, the temperature of row 4 being 103~108℃, and the temperature of row 5 being 95~100℃, and the passing speed being 10~30 m / min. Claim 9 In claim 6, the method for manufacturing the paper tape further comprises a process of aging after drying and curing, wherein the aging process is performed for 70 to 85 hours at a temperature of 20 to 60°C and a humidity of 20 to 40%. Claim 10 A method for manufacturing a paper tape according to claim 6, wherein the water-dissolvable silicone emulsion is prepared by comprising the steps of: mixing silicone oil and a surfactant for release agent at 25 to 30°C for at least 30 minutes, then slowly adding distilled water to adjust the initial pH to 5.5 to 6.5; forming an emulsion by high-speed stirring at 40 to 50°C for 30 to 60 minutes, and homogenizing the particle size using a high-pressure homogenizer; and cooling to 25°C or lower. Claim 11 A method for manufacturing a paper tape according to claim 6, wherein the water-dissolvable acrylic emulsion is prepared by adding a radical initiator to a pre-emulsion prepared by mixing water, a surfactant for adhesives, and an acrylic monomer, and then introducing the pre-emulsion by a dropping method within 3 hours into a reactor set at 79±3℃ where a buffer and a functional additive are prepared, followed by aging at 79±3℃ for 150 to 200 minutes, cooling to 40±3℃, carrying out a neutralization process using a neutralizing agent, and then adding and stirring a hygroscopic agent.

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