Water-based hot melt adhesive and water-based hot melt adhesive coating non-woven fabric

Abstract

The invention relates to a water-based hot melt adhesive and a water-based hot melt adhesive coating non-woven fabric. The invention provides a water-based hot melt adhesive. The water-based hot melt adhesive comprises the following components in percentage by weight: 10-35% of water-based thermoplastic resin; 20 wt% to 45 wt% of a powder wax; and 40 to 60 weight percent of a tackifier; wherein the tackifier comprises an emulsion tackifier and a powder tackifier, and the total weight of the powder of the water-based hot melt adhesive accounts for 40-65 weight percent of the total weight of the water-based hot melt adhesive. A coating formed by the water-based hot melt adhesive on a medical packaging base material has good air permeability, and has reliable sealing strength and peelability after being sealed with a flexible sheet or a blister container at the periphery.

Description

Technical Field

[0001] The invention relates to a water-based hot melt adhesive, which can be used for hot melt adhesive coating of medical product packaging materials to be suitable for heat sealing and achieve good sealing strength. Background Art

[0002] The main purpose of medical supply packaging materials is to provide a bacteria-proof protective environment for medical supplies during transportation or before use after they are manufactured, so that the medical devices remain sterile before use. Medical supplies are generally sterilized after packaging, and the sterilization process can usually be divided into steam sterilization (SteamSterilization), EO sterilization (Ethylene Oxide Sterilization) and radiation sterilization (RadiationSterilization). Due to different sterilization methods, the medical packaging materials used are also different. For example, for packaging materials used for EO sterilization and steam sterilization, the materials need to have excellent gas permeability to ensure that water vapor or EO gas can effectively pass through the packaging bag during the sterilization process and sterilize the internal medical devices. In the prior art, the most widely used materials that have both good microbial barrier effects and air permeability can be medical paper or a polyethylene film with pores made by melt-blowing, for example

[0003] Such medical packaging materials are usually packaged by heat sealing, where a breathable material such as medical paper or a porous polyethylene film is heat-sealed on four sides with another plastic film or a blister. In addition to good breathability, the medical packaging material must also have good heat-sealing strength and peelability. Insufficient heat-sealing strength will result in poor sealing of the medical packaging, which may cause bag breakage due to high gas pressure during sterilization, while excessive heat-sealing strength will make it difficult for users to tear open the package or cause dust to adhere to the medical supplies due to pulling the fibers when tearing.

[0004] Such breathable materials for medical use, such as medical paper or polyethylene films with pores, are usually coated with heat-seal adhesives to be heat-sealed with various plastic packaging trays or films.

[0005] The heat-sealing adhesive used in medical breathable materials is hot melt adhesive for sealing. The traditional hot melt adhesive formula is to melt and mix the thermoplastic resin, tackifier, wax, filler, plasticizer, antioxidant and additives, and then shape them into the form of granules, strips, sheets and films, and then use hot pressing or hot melting treatment for processing.

[0006] For example, CN108587521A discloses a water-based coating heat seal adhesive for medical dialysis paper, which is prepared by stirring and emulsifying thermoplastic resin, resin tackifier, wax, emulsifier and auxiliary agent at 120°C to form a hot melt adhesive coating liquid, and then applied to medical paper or non-woven fabric to form a heat seal layer. This sealing layer provides high adhesion, but if the adhesion is too large, it is easy to cause damage when the medical packaging is torn, which may cause the medical packaging material to fall and pollute the medical material. The medical blister box heat seal material disclosed in CN110591602A is coated with a surface glue and a base glue of different components, and the bonding force between the surface glue and the base glue is lower than that between the surface glue and the packaging material, so as to maintain the bonding force between the medical sealing material and the blister box but not easy to tear the heat seal material. However, this requires the coating of two layers of glue, which will increase the inconvenience of production. In addition, CN108441149A discloses a two-stage manufacturing method for preparing a hot melt adhesive coating for use in the heat-sealing layer of medical packaging materials. The manufacturing method is to melt and mix a thermoplastic resin, a resin tackifier, and a wax at a high temperature above 160°C to form a hot melt adhesive powder, and then emulsify and disperse the hot melt adhesive powder in a polyacrylic acid emulsion with an emulsifier to form a coating. This two-stage manufacturing method increases the complexity of production.

[0007] The present invention provides a water-based hot melt adhesive that can be used for medical packaging materials. The coating formed on the medical packaging substrate can provide good air permeability and has reliable sealing strength and peelability after peripheral sealing with a flexible sheet or a blister container. Summary of the invention

[0008] The present invention provides a water-based hot melt adhesive, which can form a coating on an olefin-based spunbonded non-woven fabric for medical use, so that the non-woven fabric still has good air permeability after being sealed with a flexible sheet or a blister container at the periphery, so as to facilitate steam sterilization and EO gas sterilization processes and maintain sealing stability, and at the same time has reliable sealing strength and peelability, so that when peeling the heat-sealed seal, the water-based hot melt adhesive interface can be stably disconnected and the pollution caused by the shedding of non-woven fabric substrate fibers can be reduced. In addition, the water-based hot melt adhesive of the present invention can eliminate the mixing step required by traditional hot melt adhesives, and can achieve the required adhesion and specific air permeability of hot melt adhesives after application.

[0009] The water-based hot melt adhesive disclosed in the present invention comprises 10 to 35 weight percent of a water-based thermoplastic resin, 20 to 45 weight percent of a powder wax and 40 to 60 weight percent of a tackifier, wherein the tackifier comprises an emulsion tackifier and a powder tackifier, and the total amount of powder in the water-based hot melt adhesive accounts for between 40 to 65 weight percent of the total weight of the water-based hot melt adhesive.

[0010] The water-based hot melt adhesive disclosed in the present invention preferably comprises 13 to 30 weight percent of a water-based thermoplastic resin, 22 to 40 weight percent of a powder wax and 40 to 55 weight percent of a tackifier, wherein the tackifier comprises an emulsion tackifier and a powder tackifier and the total amount of powder in the water-based hot melt adhesive accounts for between 41 to 61 weight percent of the total weight of the hot melt adhesive.

[0011] In the water-based hot melt adhesive disclosed in the present invention, the powder wax accounts for between 40 weight percent and 75 weight percent of the total powder amount, and preferably between 45 weight percent and 70 weight percent, while the powder viscosity enhancer accounts for between 25 weight percent and 60 weight percent of the total powder amount, and preferably between 30 weight percent and 55 weight percent.

[0012] The glass transition temperature (Tg) of the water-based hot melt adhesive disclosed in the present invention is between 0°C and -80°C.

[0013] In the water-based hot melt adhesive disclosed in the present invention, the particle size (D50) of the powder wax is between 3 micrometers (μm) and 50 micrometers (μm), preferably between 5 micrometers (μm) and 25 micrometers (μm).

[0014] In the water-based hot melt adhesive disclosed in the present invention, the glass transition temperature (Tg) of the powder wax is less than 0° C. and the melting point is between 70° C. and 180° C. In the water-based hot melt adhesive of the present invention, the powder wax can be Fischer-Tropsch synthetic powder wax, polypropylene powder wax, polyethylene powder wax, oxidized polyethylene powder wax, microcrystalline wax or a combination thereof.

[0015] In the water-based hot melt adhesive disclosed in the present invention, the tackifier includes an emulsion tackifier and a powder tackifier, wherein the emulsion tackifier can be, for example, a petroleum resin emulsion, a rosin ester and its derivative emulsion, a terpene resin and its modified resin emulsion, a thermoplastic phenolic resin emulsion, a low molecular weight polystyrene emulsion or an ethylene acrylic acid copolymer emulsion or a combination thereof; the powder tackifier can be, for example, a C5 petroleum resin powder, a C9 petroleum resin powder, a C5 / C9 copolymer petroleum resin powder, a hydrogenated C9 petroleum resin powder or a combination thereof.

[0016] In the embodiment of the water-based hot melt adhesive of the present invention, the amount of the powder thickener used is 20 weight percent to 65 weight percent of the total weight of the thickener, preferably between 25 weight percent and 60 weight percent, and one or more powder thickeners can be used.

[0017] In the water-based hot melt adhesive disclosed in the present invention, the particle size (D50) of the powder tackifier is between 3 micrometers (μm) and 50 micrometers (μm), preferably between 5 micrometers (μm) and 45 micrometers (μm).

[0018] In the embodiment of the water-based hot melt adhesive of the present invention, the amount of the emulsion thickener used is 35 weight percent to 80 weight percent of the total weight of the thickener, preferably between 40 weight percent and 75 weight percent, and one or more emulsion thickeners can be used.

[0019] In the water-based hot melt adhesive disclosed in the present invention, the glass transition temperature (Tg) of the water-based thermoplastic resin is less than 0°C and the melting point is between 150°C and 300°C. In the water-based hot melt adhesive disclosed in the present invention, the water-based thermoplastic resin can be a thermoplastic polymer, such as ethylene-vinyl acetate, styrene-butadiene-rubber, styrene-butadiene-styrene block copolymer, styrene-acrylic acid copolymer, ethylene acrylic acid resin, polyacrylic acid resin or a combination of the like. In the embodiment of the water-based hot melt adhesive of the present invention, the water-based thermoplastic resin can use one or more water-based thermoplastic resins.

[0020] The present invention further provides a water-based hot melt adhesive coated nonwoven fabric, which comprises a polyolefin-based spunbonded nonwoven fabric substrate and a coating formed by the water-based hot melt adhesive on at least one surface of the substrate. The water-based hot melt adhesive coated nonwoven fabric has an air permeability of less than 120 seconds (TAPPI T-460) and a sealing strength greater than 220 g / 15 mm (ASTM F-88).

[0021] The coating amount of the water-based hot melt adhesive of the water-based hot melt adhesive coated non-woven fabric of the present invention on the olefin-based spunbonded non-woven fabric substrate is 8 g / m 2 Up to 20g / m 2 between.

[0022] The above invention content is intended to provide a simplified summary of the present disclosure so that readers can have a basic understanding of the present disclosure. The invention content is not a complete overview of the present disclosure, and its intention is not to point out the important / key elements of the embodiments of the present invention or to define the scope of the present invention. After referring to the following embodiments, those with ordinary knowledge in the technical field to which the present invention belongs can easily understand the basic spirit of the present invention and the technical means and embodiments adopted by the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a scanning electron microscope (SEM) image at 500 times magnification of the surface of the water-based hot melt adhesive coated non-woven fabric of Example 10 of the present invention.

[0024] Figure 2 This is a scanning electron microscope (SEM) image of a cross section of a HDPE film at a magnification of 500 after a peeling test of Example 10 of the present invention.

[0025] Figure 3 This is a 500-fold scanning electron microscope (SEM) image of the non-woven fabric surface after the peeling test of Example 10 of the present invention.

[0026]

Explanation of symbols

[0027] 100: Non-woven fabric

[0028] 200:HDPE film DETAILED DESCRIPTION

[0029] In order to make the description of the disclosure of the present invention more detailed and complete, the following is an illustrative description of the implementation methods and specific examples of the present invention; however, this is not the only form of implementing or applying the specific examples of the present invention. The various embodiments disclosed below can be combined or replaced with each other under beneficial circumstances, and other embodiments can be added to one embodiment without further recording or explanation.

[0030] The advantages, features and technical methods of implementing the present invention will be described in more detail with reference to exemplary embodiments so as to be easier to understand, and the present invention can also be implemented in different forms, so it should not be understood as being limited to the embodiments described herein. On the contrary, for those with ordinary knowledge in the relevant technical field, the provided embodiments will make the present disclosure more thorough and comprehensive and fully convey the scope of the present invention, and the present invention will only be limited by the attached claims.

[0031] Unless otherwise defined, all terms (including technical and scientific terms) and proper nouns used in the following text have essentially the same meaning as generally understood by technical personnel in the field to which the present invention belongs. For example, those terms defined in commonly used dictionaries should be understood to have meanings consistent with the content of the relevant field, and unless clearly defined in the following text, they will not be understood in an overly idealized or overly formal sense.

[0032] The present invention provides a water-based hot melt adhesive, which comprises 10 to 35 weight percent of a water-based thermoplastic resin, 20 to 45 weight percent of a powder wax and 40 to 60 weight percent of a tackifier, wherein the tackifier comprises an emulsion tackifier and a powder tackifier, and the total amount of powder in the water-based hot melt adhesive accounts for between 40 to 65 weight percent of the total weight of the water-based hot melt adhesive.

[0033] The water-based hot melt adhesive of the present invention can be coated on the surface of the polyolefin spunbond nonwoven fabric for medical packaging after adding water as a solvent, and the water-based hot melt adhesive coated nonwoven fabric can be prepared after heating to remove the solvent. The water-based hot melt adhesive coated nonwoven fabric can provide good air permeability, so that the water-based hot melt adhesive coated nonwoven fabric and the flexible sheet or blister container can be steam sterilized or EO gas sterilized after the peripheral heat sealing. In addition, the water-based hot melt adhesive of the present invention can provide good thermal adhesion and peelability. The medical packaging material prepared by it can have the required heat sealing strength. When the packaging material is torn, the packaging material will be stably disconnected from the adhesive layer at the heat sealing point of the water-based hot melt adhesive to maintain the heat sealing stability and reduce the pollution caused by the shedding of the substrate fiber.

[0034] The water-based hot melt adhesive of the present invention contains a high total amount of powder so that when the water-based hot melt adhesive is coated on the polyolefin-based spunbonded non-woven fabric for medical packaging, the coating can maintain appropriate gaps while still providing the expected sealing strength and adhesion to the non-woven fabric. If the total amount of powder is too small, the coating will have insufficient air permeability, and if the total amount of powder is too large, the sealing strength will be too low.

[0035] The water-based hot melt adhesive of the present invention directly adds powder wax and powder tackifier to water-based thermoplastic resin (Tg<0°C) and emulsion tackifier, and then adds water as a solvent and fully mixes and disperses to form a coating liquid for subsequent coating process. After coating, the solvent is evaporated by heating to obtain the water-based hot melt adhesive of the present invention. The water-based hot melt adhesive of the present invention can eliminate the mixing step required by traditional hot melt adhesives, directly perform the heat sealing process, and can achieve the required adhesion and specific breathability of hot melt adhesives after application.

[0036] In a preferred embodiment of the present invention, the water-based hot melt adhesive preferably comprises 13 weight percent to 30 weight percent of a water-based thermoplastic resin, 22 weight percent to 40 weight percent of a powder wax and 40 weight percent to 55 weight percent of a tackifier, wherein the tackifier comprises an emulsion tackifier and a powder tackifier and the total amount of powder in the water-based hot melt adhesive accounts for between 41 weight percent and 61 weight percent of the total weight of the hot melt adhesive.

[0037] The glass transition temperature (Tg) of the water-based thermoplastic resin used in the water-based hot melt adhesive of the present invention may be less than 0°C, and the melting point may be between 150°C and 300°C. In an embodiment of the present invention, the water-based hot melt adhesive may use one or more water-based thermoplastic resins. The water-based thermoplastic resin used in the water-based hot melt adhesive of the present invention may be, for example, ethylene-vinyl acetate, styrene-butadiene rubber, styrene-butadiene-styrene block copolymer, styrene-acrylic copolymer, ethylene acrylic resin, polyacrylic resin or a combination of the like, but is not limited thereto.

[0038] The water-based thermoplastic resin suitable for the water-based hot melt adhesive of the present invention can be a commercially available product. Ethylene vinyl acetate (EVA) can be, for example, EAF 68 provided by Wacker Chemical Corporation of Germany; styrene butadiene rubber (SBR) can be, for example, SB2108, LPF5356, LPF7814, LPF7833 provided by Goodyear Chemical Company of the United States, and DL326PA provided by Trinseo, USA; styrene butadiene styrene block copolymer (SBS) can be, for example, WB-24 provided by Yuan Hong Industrial Corporation of Taiwan, China; acrylic resin can be, for example, Carbotac provided by Lubrizol Corporation of the United States. TM 1822, Carbotac TM 1814, etc.; Styrene-acrylic acid copolymers can be provided by Lubrizol Corporation of the United States, for example GA-7428, but not limited thereto.

[0039] The powder wax of the water-based hot melt adhesive of the present invention is used to reduce the melt viscosity and surface viscosity of the water-based hot melt adhesive and adjust the fluidity and wettability of the hot melt adhesive, but will not significantly reduce the adhesive properties of the water-based hot melt adhesive. The powder wax content of the water-based hot melt adhesive of the present invention is between 20 weight percent and 45 weight percent, preferably between 22 weight percent and 40 weight percent. In addition, in order to help the coating formed by the water-based hot melt adhesive of the present invention on the polyolefin-based spunbond non-woven fabric substrate have good air permeability, the particle size (D50) of the powder wax can be between 3 microns (μm) and 50 microns (μm), and preferably between 5 microns (μm) and 25 microns (μm).

[0040] The glass transition temperature (Tg) of the powder wax suitable for the water-based hot melt adhesive of the present invention is less than 0°C and the melting point is preferably between 70°C and 180°C. The powder wax used in the present invention can be, for example, commercially available Fischer-Tropsch synthetic powder wax, polypropylene powder wax, polyethylene powder wax, oxidized polyethylene powder wax, microcrystalline wax or a combination thereof, but is not limited thereto. Suitable polypropylene powder wax can be, for example, BYK's 913, 914. Germany's Münzing Chemie MP2120, etc.; Suitable polyethylene powder waxes may be, for example, BYK's 925, 929N, Germany's MünzingChemie MO4715, etc.; applicable Fischer-Tropsch synthetic powder waxes may be, for example, Sasolwax Spray 30-G, Spray 30G-M, Spray 30G-EF, Spray 105, Spray 105-G, Spray 105G-EF, Sasolwax Aqua 30-G, Aqua30G-EF, etc. from Sasol Chemicals Pacific Ltd. of South Africa, but are not limited thereto.

[0041] The use of a tackifier in the water-based hot melt adhesive of the present invention can reduce the melt viscosity of the water-based hot melt adhesive, improve the wettability and initial adhesion of the adherend, and adjust the heat resistance temperature of the hot melt adhesive. The tackifier suitable for the water-based hot melt adhesive of the present invention has a glass transition temperature (Tg) greater than 0°C and a melting point between 70°C and 160°C.

[0042] The water-based hot melt adhesive of the present invention includes an emulsion thickener and a powder thickener, wherein the powder thickener can achieve a high total powder amount together with the powder wax, so that when the water-based hot melt adhesive is coated on the polyolefin spunbond non-woven fabric for medical packaging, the coating can maintain appropriate gaps while still providing the expected sealing strength and adhesion to the non-woven fabric.

[0043] The amount of emulsion thickener and powder thickener in the water-based hot melt adhesive of the present invention can be adjusted according to the powder wax and total powder usage of the water-based hot melt adhesive. In an embodiment of the water-based hot melt adhesive of the present invention, the powder wax accounts for between 40 weight percent and 75 weight percent of the total powder, and the powder thickener accounts for between 25 weight percent and 60 weight percent of the total powder. In another preferred embodiment of the water-based hot melt adhesive of the present invention, the powder wax accounts for between 45 weight percent and 70 weight percent of the total powder, and the powder thickener accounts for between 30 weight percent and 55 weight percent of the total powder. If the amount of powder wax used is too little, the uniform fracture characteristics of the adhesive layer cannot be achieved; if the amount of powder wax used is too much, the sealing strength will be insufficient.

[0044] The particle size (D50) of the powder tackifier used in the water-based hot melt adhesive of the present invention may be between 3 micrometers (μm) and 50 micrometers (μm), preferably between 5 micrometers (μm) and 45 micrometers (μm). In an embodiment of the present invention, the water-based hot melt adhesive may use one or more powder tackifiers. The powder tackifier suitable for the water-based hot melt adhesive of the present invention may be a petroleum resin powder or a hydrogenated petroleum resin powder, such as C5 petroleum resin powder, C9 petroleum resin powder, C5 / C9 copolymerized petroleum resin powder, hydrogenated C9 petroleum resin powder or a combination thereof, such as the commercially available Cray Valley Corporation of the United States. 95. 98. STS, Extra, W-90, W-110, W-120, W-140, Regalite provided by Synthomer, UK TM R1090, Regalite TM R1125, YL-90, YL-120H etc. provided by Yuan Liang Industrial Co., Ltd., Taiwan, China, but not limited thereto.

[0045] In the water-based hot melt adhesive of the present invention, the emulsion tackifier can contribute to the overall compatibility and coating properties of the water-based hot melt adhesive. In an embodiment of the present invention, the water-based hot melt adhesive can use one or more emulsion tackifiers. The emulsion tackifier suitable for the water-based hot melt adhesive of the present invention can be, for example, a petroleum resin emulsion, a rosin ester and its derivative emulsion, a terpene resin and its modified resin emulsion, a thermoplastic phenolic resin emulsion, a low molecular weight polystyrene emulsion, an ethylene acrylic acid copolymer emulsion, etc. Applicable petroleum resin emulsions include aliphatic hydrocarbon resin emulsions, cycloaliphatic hydrocarbon resin emulsions, aromatic hydrocarbon resin emulsions, aliphatic / aromatic copolymer resin emulsions, such as C5 aliphatic hydrocarbon resin emulsions, C9 aromatic hydrocarbon resin emulsions and C5 / C9 aliphatic / aromatic copolymer resin emulsions, hydrogenated petroleum resin emulsions, etc. Applicable rosin esters and their derivatives emulsions include rosin resins and their derivatives emulsions such as gum rosin emulsions, wood rosin emulsions, and tall oil rosin and its derivatives emulsions. Applicable terpene resins and modified resin emulsions thereof include terpene resin emulsions, hydrogenated terpene resin emulsions, aromatic modified resin emulsions, terpene-phenolic resin emulsions, etc. In the present invention, these emulsion tackifiers can be used in combination.

[0046] In addition, the water-based hot melt adhesive of the present invention is used to form a water-based hot melt adhesive coating on an olefin-based non-woven fabric. If the water-based hot melt adhesive contains an excessive amount of emulsion thickener, the water-based hot melt adhesive coating may penetrate into the non-woven fabric after coating, affecting the overall air permeability. In the embodiment of the water-based hot melt adhesive of the present invention, the amount of the emulsion thickener used accounts for 35 weight percent to 80 weight percent of the total weight of the thickener, preferably between 40 weight percent and 75 weight percent, and one or more emulsion thickeners can be used.

[0047] Suitable emulsion tackifiers can be commercially available, such as the emulsified rosin ester provided by DRT Company of France. RE802, water-based rosin acid emulsion RA702, terpene phenolic resin emulsion TR602, C5 resin emulsion DP1124, water-based rosin ester SUPER ESTER E720W provided by Arakawa Chemical Industries, Japan, and ethylene acrylic acid copolymer aqueous dispersion provided by Michelman Company, USA Prime4983R, Prime 4990R, Prime 4983-40R, Aquacer 1061, an ethylene acrylic acid copolymer latex provided by BYK, and Addtack, a rosin ester emulsion provided by West Tech Chemical of China TM 880L, etc., but not limited to.

[0048] The water-based hot melt adhesive disclosed in the present invention may further include other additives, such as wetting dispersants, defoamers, thickeners, etc., which are beneficial to the coating processability of the water-based hot melt adhesive; antioxidants, UV stabilizers, antibacterial agents, antistatic agents, etc., which are added to increase the functionality of the water-based hot melt adhesive. The types and amounts of these additives can be selected by those skilled in the art according to actual needs.

[0049] In addition, the water-based hot melt adhesive of the present invention is prepared by mixing water-based thermoplastic resin with emulsion tackifier, directly adding powder wax, powder tackifier and water as solvent, and fully stirring and dispersing to form a coating liquid for subsequent coating process. The water-based hot melt adhesive of the present invention can eliminate the mixing step required by traditional hot melt adhesives, and can achieve the required adhesion and specific breathability of hot melt adhesives after application.

[0050] The present invention further provides a water-based hot melt adhesive coated nonwoven fabric, which comprises a polyolefin-based spunbond nonwoven fabric substrate and a coating formed by the water-based hot melt adhesive on at least one surface of the substrate. The water-based hot melt adhesive coated nonwoven fabric can have an air permeability of less than 120 seconds (TAPPI T-460) and a sealing strength greater than 220g / 15mm (ASTM F-88).

[0051] The "seal strength" referred to herein refers to the tensile force required to separate two sealed flexible sheets, and the strength is measured in a "T-separation" test at a tensile speed of 200 mm / min according to ASTM F-88.

[0052] The "air permeability" mentioned herein refers to the air resistance of gas passing through a breathable sheet, which is measured according to TAPPI T-460 standard as the air resistance of 100 cc of gas passing through a circular area of ​​about 1 square inch at a pressure difference of 1.22 kPa.

[0053] The olefin spunbond nonwoven fabric suitable for the water-based hot melt adhesive coated nonwoven fabric of the present invention can be selected from the density between 40g / m2 and 40g / m2 widely used in medical packaging. 2Up to 80g / m 2 DuPont For example 1073B, 1059B, 2FS, etc., but not limited to.

[0054] The water-based hot melt adhesive of the present invention can be coated on an olefin-based spunbond non-woven fabric substrate to form a water-based hot melt adhesive coated non-woven fabric that can be used for medical packaging. The coating can be evenly coated on the non-woven fabric substrate or locally coated in a specific area, and the coating amount is between 8 g / m 2 Up to 20g / m 2 , preferably between 10g / m 2 Up to 18g / m 2 .

[0055] The packaging substrate suitable for sealing with the water-based hot melt adhesive coated non-woven fabric of the present invention can be, for example, polyethylene terephthalate (PET), polyethylene terephthalate-1,4-cyclohexylenedimethylene terephthalate (PETG), polyvinyl chloride (PVC), polystyrene (PS), polypropylene (PP), polyethylene (PE), polycarbonate (PC), nylon (Nylon) film or its blister hard substrate, but is not limited thereto.

[0056] The water-based hot melt adhesive coated nonwoven fabric of the present invention can be thermally bonded to another packaging substrate, such as the aforementioned substrate, at a temperature of 90°C to 150°C, and the sealing strength after bonding is greater than 220g / 15mm, preferably greater than 250g / 15mm.

[0057] The preparation method of the water-based hot melt adhesive coated non-woven fabric disclosed in the present invention includes: after mixing the water-based thermoplastic resin and the emulsion thickener, adding the powder wax, the powder thickener and water as a solvent, fully stirring and dispersing, and forming a water-based hot melt adhesive emulsion. The prepared water-based hot melt adhesive emulsion can be coated on a polyolefin-based spunbond non-woven fabric substrate, and dried at a temperature of 60°C to 100°C to remove the solvent to form a water-based hot melt adhesive coated non-woven fabric. The coating method of the water-based hot melt adhesive can adopt, for example, a roller coating method, a blade coating method, a roller coating method, a spin coating method, a spray coating method, a slit coating method, a wind knife coating method and other coating methods widely used in the technical field, but not limited thereto.

[0058] The water-based hot melt adhesive coated nonwoven fabric of the present invention has good air permeability after being heat-sealed with a flexible sheet or a blister container at the periphery, so as to facilitate steam sterilization or EO gas sterilization process, and at the same time has reliable sealing strength and peelability, so that when the heat-sealed seal is peeled off, it can be stably disconnected by the water-based hot melt adhesive interface, thereby reducing the problem of nonwoven fabric fiber shedding causing medical device contamination.

[0059] The following examples are used to further illustrate the present invention, but the present invention is not limited thereto.

[0060] Example.

[0061] The materials used in the embodiments of the present invention are as follows:

[0062] SB 2108: styrene-butadiene-rubber latex, melting point 185.7°C, glass transition temperature (Tg) -49.9°C, solid content 40.5%, solvent water, purchased from Goodyear Chemical Company, USA

[0063] DL 326PA: styrene-butadiene-rubber latex, melting point 230.9°C, glass transition temperature (Tg) -42.1°C, solid content 50%, solvent water, purchased from Trinseo, USA;

[0064] 1822: polyacrylic acid latex, melting point 212.9°C, glass transition temperature (Tg) -43°C, solid content 52.5%, solvent water, purchased from Lubrizol, USA;

[0065] EAF-68: ethylene-vinyl acetate-acrylic acid copolymer latex, melting point 240°C, glass transition temperature (Tg) -35°C, solid content 59.5%, solvent water, purchased from Wacker Chemie AG, Germany;

[0066] WB-24: styrene-butadiene-styrene block copolymer latex, melting point 240°C, glass transition temperature (Tg) -41.7°C, solid content 50%, solvent water, purchased from Taiwan Yuan Hong Industrial Co., Ltd., China;

[0067] Prime 4983-40R: ethylene acrylic acid copolymer latex, melting point 140°C, glass transition temperature (Tg) 6.2°C, solid content 40%, solvent water, purchased from Michelman Company, USA;

[0068] RE802: rosin glycerol ester emulsion, softening point 70 ° C, glass transition temperature (Tg) 17.9 ° C, solid content 52%, solvent is water, purchased from DRT, France;

[0069] Addtack TM 880L: rosin ester emulsion, softening point 75-85°C, glass transition temperature (Tg) 33.4°C, solid content 55%, solvent water, purchased from West Tech Chemical Co., Ltd., China;

[0070] Sasolwax Spray 30G-M: Fischer-Tropsch synthetic powder wax, melting point 96-100°C, glass transition temperature (Tg) about -120°C, average particle size 9-11 μm, purchased from Sasol Limited, South Africa

[0071] Ceraflour 914: polypropylene powder wax, melting point 160°C, glass transition temperature (Tg) about -20°C, average particle size 24 μm, purchased from BYK, Germany;

[0072] W-140: C9 petroleum resin powder, softening point of 140°C, glass transition temperature (Tg) of 90°C, average molecular weight (Mn) of 1200 g / mol, average particle size of 5-10 μm, purchased from Cray Valley Chemical Co., Ltd., USA;

[0073] W-140 (B): C9 petroleum resin powder, softening point of 140 ° C, glass transition temperature (Tg) of 90 ° C, average molecular weight (Mn) of 1200 g / mol, average particle size of 30-40 μm, purchased from Cray Valley Chemical Co., Ltd., USA;

[0074] W-120: C9 petroleum resin powder, softening point of 120°C, glass transition temperature (Tg) of 70°C, average molecular weight (Mn) of 950 g / mol, average particle size of 10-20 μm, purchased from Cray Valley Chemical Co., Ltd., USA;

[0075] W-90: C9 petroleum resin powder, softening point 90°C, glass transition temperature (Tg) 40°C, average molecular weight (Mn) 650 g / mol, average particle size 30-40 μm, purchased from Cray Valley Chemical Co., Ltd., USA;

[0076] 95: C5 petroleum resin powder, softening point 98°C, glass transition temperature (Tg) 55°C, average molecular weight (Mn) 1100 g / mol, average particle size 30-40 μm, purchased from Cray Valley Chemical Co., Ltd., USA;

[0077] Extra: C5 / C9 petroleum resin powder, softening point 97°C, glass transition temperature (Tg) 52°C, average molecular weight (Mn) 1100 g / mol, average particle size 30-40 μm, purchased from Cray Valley Chemical Co., Ltd., USA;

[0078] YL-90: C9 petroleum resin powder, softening point of 100°C, glass transition temperature (Tg) of 50°C, average molecular weight (Mn) of 750 g / mol, average particle size of 30-40 μm, purchased from Yuanliang Industrial Co., Ltd., Taiwan, China;

[0079] BYK-3450: polyether modified siloxane wetting and dispersing agent, purchased from BYK, Germany;

[0080] Wet 240: polysiloxane wetting and dispersing agent, purchased from Evonik Industries, Germany;

[0081] BYK-025: polysiloxane defoamer, solid content 18.5%, solvent dipropylene glycol monomethyl ether, purchased from BYK, Germany;

[0082] 2FS: high-density polyethylene spunbond nonwoven fabric substrate, purchased from DuPont, USA.

[0083] Example 1.

[0084] 7.5 parts by weight of styrene-butadiene-rubber latex (SB 2108), 5.6 parts by weight of ethylene acrylic acid copolymer latex ( Prime 4983-40R), 1.5 parts by weight of rosin glycerol ester emulsion ( RE 802), 3.75 parts by weight of Fischer-Tropsch wax powder (Sasolwax Spray 30G-M), 3.75 parts by weight of C9 petroleum resin powder W-140(B)), 0.04 parts by weight of a dispersant (BYK-3450), 44.8 parts by weight of deionized water and 0.8 parts by weight of ethanol were mixed and stirred for 1 hour to uniformly disperse them to form an aqueous hot melt adhesive solution.

[0085] Apply the hot melt adhesive solution to 2FS high-density polyethylene substrate, after drying, the coating weight on the substrate is 13.2g / m 2 Hot melt adhesive coating. To produce water-based hot melt adhesive coated non-woven fabric.

[0086] The obtained water-based hot melt adhesive coated nonwoven fabric was subjected to air permeability test, heat sealing strength test and peeling test according to the method described below. The test results are shown in Table 1 below.

[0087] Example 2.

[0088] 7.5 parts by weight of styrene-butadiene-rubber latex (SB 2108), 5.6 parts by weight of ethylene acrylic acid copolymer latex ( Prime 4983-40R), 1.5 parts by weight of rosin glycerol ester emulsion ( RE802), 5.625 parts by weight of Fischer-Tropsch wax powder (Sasolwax Spray30G-M), 3.75 parts by weight of C9 petroleum resin powder ( W-120), 0.04 parts by weight of a dispersant (BYK-3450), 0.04 parts by weight of a defoamer (BYK-025), 41.6 parts by weight of deionized water and 4 parts by weight of ethanol were mixed and stirred for 1 hour to uniformly disperse them to form an aqueous hot melt adhesive solution.

[0089] Apply the hot melt adhesive solution to 2FS high-density polyethylene substrate, after drying, the coating weight on the substrate is 12.5g / m 2 Hot melt adhesive coating. To produce water-based hot melt adhesive coated non-woven fabric.

[0090] The obtained water-based hot melt adhesive coated nonwoven fabric was subjected to air permeability test, heat sealing strength test and peeling test according to the method described below. The test results are shown in Table 1 below.

[0091] Example 3.

[0092] 7.5 parts by weight of styrene-butadiene-rubber latex (SB 2108), 5.6 parts by weight of ethylene acrylic acid copolymer latex ( Prime 4983-40R), 1.5 parts by weight of rosin glycerol ester emulsion ( RE802), 3.75 parts by weight of polypropylene powder wax (Ceraflour 914), 3.75 parts by weight of C9 petroleum resin powder ( W-90), 0.04 parts by weight of a dispersant (BYK-3450), and 24.8 parts by weight of deionized water were mixed and stirred for 1 hour to uniformly disperse them to form an aqueous hot melt adhesive solution.

[0093] Apply the hot melt adhesive solution to 2FS high-density polyethylene substrate, after drying, the coating weight on the substrate is 13.1g / m 2 Hot melt adhesive coating. To produce water-based hot melt adhesive coated non-woven fabric.

[0094] The obtained water-based hot melt adhesive coated nonwoven fabric was subjected to air permeability test, heat sealing strength test and peeling test according to the method described below. The test results are shown in Table 1 below.

[0095] Example 4.

[0096] 7.61 parts by weight of styrene-butadiene-rubber latex (DL 326PA), 7.1 parts by weight of ethylene acrylic acid copolymer latex ( Prime 4983-40R), 1.8 parts by weight of rosin ester emulsion (Addtack TM 880L), 3.76 parts by weight of Fischer-Tropsch wax powder (Sasolwax Spray30G-M), 3.76 parts by weight of C9 petroleum resin powder ( W-90), 0.06 parts by weight of a dispersant (BYK-3450), 0.04 parts by weight of a defoamer (BYK-025), and 52 parts by weight of deionized water were mixed and stirred for 1 hour to uniformly disperse them to form an aqueous hot melt adhesive solution.

[0097] Apply the hot melt adhesive solution to 2FS high-density polyethylene substrate, after drying, the coating weight on the substrate is 10.7g / m 2 Hot melt adhesive coating. To produce water-based hot melt adhesive coated non-woven fabric.

[0098] The obtained water-based hot melt adhesive coated nonwoven fabric was subjected to air permeability test, heat sealing strength test and peeling test according to the method described below. The test results are shown in Table 1 below.

[0099] Example 5.

[0100] 7.61 parts by weight of styrene-butadiene rubber latex (DL 326PA), 7.1 parts by weight of ethylene acrylic acid copolymer latex ( Prime 4983-40R), 1.8 parts by weight of rosin ester emulsion (Addtack TM880 L), 3.76 parts by weight of Fischer-Tropsch synthetic powder wax (Sasolwax Spray 30G-M), 1.88 parts by weight of C9 petroleum resin powder ( W-120), 1.88 parts by weight of C5 petroleum resin ( 95) micro powder, 0.04 parts by weight of a dispersant (BYK-3450), 0.04 parts by weight of a defoamer (BYK-025), 45.82 parts by weight of deionized water and 2.18 parts by weight of ethanol were mixed and stirred for 1 hour to uniformly disperse them to form an aqueous hot melt adhesive solution.

[0101] Apply the hot melt adhesive solution to 2FS high-density polyethylene substrate, after drying, the coating weight on the substrate is 13.9g / m 2 Hot melt adhesive coating. To produce water-based hot melt adhesive coated non-woven fabric.

[0102] The obtained water-based hot melt adhesive coated nonwoven fabric was subjected to air permeability test, heat sealing strength test and peeling test according to the method described below. The test results are shown in Table 1 below.

[0103] Example 6.

[0104] 7.61 parts by weight of styrene-butadiene-rubber latex (DL 326PA), 7.1 parts by weight of ethylene acrylic acid copolymer latex ( Prime 4983-40R), 1.8 parts by weight of rosin ester emulsion (Addtack TM 880 L), 3.76 parts by weight of Fischer-Tropsch synthetic powder wax (Sasolwax Spray 30G-M), 1.88 parts by weight of C9 petroleum resin powder ( W-120), 1.88 parts by weight of C5 / C9 petroleum resin powder ( EXTRA), 0.04 parts by weight of a dispersant (BYK-3450), 0.04 parts by weight of a defoamer (BYK-025), 45.82 parts by weight of deionized water and 2.18 parts by weight of ethanol were mixed and stirred for 1 hour to uniformly disperse them to form an aqueous hot melt adhesive solution.

[0105] Apply the hot melt adhesive solution to 2FS high-density polyethylene substrate, after drying, the coating weight on the substrate is 15.9g / m 2 Hot melt adhesive coating. To produce water-based hot melt adhesive coated non-woven fabric.

[0106] The obtained water-based hot melt adhesive coated nonwoven fabric was subjected to air permeability test, heat sealing strength test and peeling test according to the method described below. The test results are shown in Table 1 below.

[0107] Example 7.

[0108] 7.2 parts by weight of polyacrylic acid latex ( 1822), 7.1 parts by weight of ethylene acrylic acid copolymer latex ( Prime 4983-40R), 1.8 parts by weight of rosin ester emulsion (Addtack TM 880L), 3.76 parts by weight of Fischer-Tropsch wax powder (Sasolwax Spray 30G-M), 1.88 parts by weight of C9 petroleum resin powder ( W-120), 1.88 parts by weight of C9 petroleum resin powder (YL-90), 0.08 parts by weight of dispersant (BYK-3450), 0.04 parts by weight of defoamer (BYK-025), 45.82 parts by weight of deionized water and 2.18 parts by weight of ethanol were mixed and stirred for 1 hour to make them uniformly dispersed to form an aqueous hot melt adhesive solution.

[0109] Apply the hot melt adhesive solution to 2FS high-density polyethylene substrate, after drying, the coating weight on the substrate is 16.4g / m 2 Hot melt adhesive coating. To produce water-based hot melt adhesive coated non-woven fabric.

[0110] The obtained water-based hot melt adhesive coated nonwoven fabric was subjected to air permeability test, heat sealing strength test and peeling test according to the method described below. The test results are shown in Table 1 below.

[0111] Example 8.

[0112] 6.56 parts by weight of ethylene-vinyl acetate-acrylic acid copolymer latex ( EAF-68), 7.59 parts by weight of ethylene acrylic acid copolymer latex ( Prime 4983-40R), 6.9 parts by weight of rosin ester emulsion (Addtack TM 880 L), 5.04 parts by weight of Fischer-Tropsch wax powder (Sasolwax Spray 30G-M), 2.48 parts by weight of C9 petroleum resin powder ( W-140), 0.04 parts by weight of dispersant ( Wet 240), 0.04 parts by weight of a defoamer (BYK-025), and 36.7 parts by weight of deionized water were mixed and stirred for 1 hour to uniformly disperse them to form an aqueous hot melt adhesive solution.

[0113] Apply the hot melt adhesive solution to 2FS high-density polyethylene substrate, after drying, the coating weight on the substrate is 17.3g / m 2 Hot melt adhesive coating. To produce water-based hot melt adhesive coated non-woven fabric.

[0114] The obtained water-based hot melt adhesive coated nonwoven fabric was subjected to air permeability test, heat sealing strength test and peeling test according to the method described below. The test results are shown in Table 1 below.

[0115] Example 9.

[0116] 9.18 parts by weight of styrene-butadiene-styrene block copolymer latex (WB-24), 0.34 parts by weight of ethylene-vinyl acetate-acrylic acid copolymer latex ( EAF-68), 5.1 parts by weight of ethylene acrylic acid copolymer latex ( Prime 4983-40R), 5.1 parts by weight of rosin ester emulsion (Addtack TM 880 L), 5.04 parts by weight of Fischer-Tropsch wax powder (Sasolwax Spray 30G-M), 2.48 parts by weight of C9 petroleum resin powder ( W-140), 0.04 parts by weight of dispersant ( Wet 240), 0.04 parts by weight of a defoamer (BYK-025), and 34.5 parts by weight of deionized water were mixed and stirred for 1 hour to uniformly disperse them to form an aqueous hot melt adhesive solution.

[0117] Apply the hot melt adhesive solution to 2FS high-density polyethylene substrate, after drying, the coating weight on the substrate is 17.5g / m 2 Hot melt adhesive coating. To produce water-based hot melt adhesive coated non-woven fabric.

[0118] The obtained water-based hot melt adhesive coated nonwoven fabric was subjected to air permeability test, heat sealing strength test and peeling test according to the method described below. The test results are shown in Table 1 below.

[0119] Example 10.

[0120] 5.12 parts by weight of styrene-butadiene-styrene block copolymer latex (WB-24), 1.71 parts by weight of ethylene-vinyl acetate-acrylic acid copolymer latex ( EAF-68), 3.84 parts by weight of ethylene acrylic acid copolymer latex ( Prime 4983-40R), 1.86 parts by weight of rosin ester emulsion (Addtack TM880 L), 5.04 parts by weight of Fischer-Tropsch wax powder (Sasolwax Spray 30G-M), 2.48 parts by weight of C9 petroleum resin powder ( W-140), 0.036 parts by weight of dispersant ( Wet 240), 0.04 parts by weight of a defoamer (BYK-025), and 34.7 parts by weight of deionized water were mixed and stirred for 1 hour to uniformly disperse them to form an aqueous hot melt adhesive solution.

[0121] Apply the hot melt adhesive solution to 2FS high-density polyethylene substrate, after drying, the coating weight on the substrate is 14.1g / m 2 The water-based hot melt adhesive coating nonwoven fabric 100 is prepared.

[0122] The surface of the obtained water-based hot melt adhesive coated nonwoven fabric was imaged under a scanning electron microscope (SEM) at a magnification of 500 as shown in FIG. Figure 1 The water-based hot melt adhesive coating of the present invention was subjected to air permeability test, heat seal strength test and peel test according to the method described below. The test results are shown in Table 1 below.

[0123] Evaluation methods for coating weight measurement, air permeability test, heat seal strength test and peel test of water-based hot melt adhesive coated non-woven fabrics:

[0124] Coating weight measurement: Using a circular cutter (Sample Cutter 240 / 100, purchased from Hans Schmidt & Co GmbH, Germany), according to the test standard of EN ISO 536, the weight of the aforementioned water-based hot melt adhesive coated non-woven fabric and the uncoated high-density polyethylene spunbond non-woven fabric substrate were measured respectively. The weight of the water-based hot melt adhesive coating was obtained by subtracting the two. The unit is grams per square meter (g / m2). 2 (gsm).

[0125] Air permeability test: using an air permeability tester (Model 4980-D, purchased from Liansheng Instruments, Taiwan, China), according to the test standard of TAPPI T-460, the average number of seconds required for 100cc of air to pass through the aforementioned water-based hot melt adhesive coated nonwoven fabric was measured.

[0126] Measurement of sealing strength: HDPE film 200, Teflon cloth and the aforementioned water-based hot melt adhesive coated non-woven fabric were heat pressed using a heat sealing tester (BS-25, purchased from Daba Precision Machinery, Taiwan, China). The upper plate temperature was set to 123 degrees, the lower plate temperature was set to room temperature, the heat sealing pressure was set to 1.5 kg, and the pressing seconds were set to 1.5 seconds. The resulting heat-sealed composite product was cut into 15 mm wide strips of specimens, and the maximum tensile value was measured using a tensile tester (AI-3000, purchased from Gaotie Technology, Taiwan, China) according to the test standard of ASTM F-88, which is the sealing strength.

[0127] Peeling test: The HDPE film 200 in the aforementioned heat-sealed synthetic product was torn off from the water-based hot melt adhesive coated non-woven fabric by hand, and the high-density polyethylene spunbond non-woven fabric substrate after torn off was visually observed to see whether there was fiber peeling. If no fiber peeling was found on the surface of the substrate, it was evaluated as 0, and if fiber peeling was found on the surface of the substrate, it was evaluated as ×.

[0128] Table 1: Coating weight, air permeability, heat seal strength and peel test results of water-based hot melt adhesive coated nonwoven fabrics of the embodiment

[0129] Example <![CDATA[Coating weight (g / m 2 )]]> Air permeability(s) Sealing strength (gf / 15mm) Peel test Example 1 13.2 38 283 〇 Example 2 12.5 44 289 〇 Example 3 13.1 39 329 〇 Example 4 10.7 55 318 〇 Example 5 13.9 47 280 〇 Example 6 15.9 91 310 〇 Example 7 16.4 113 412 〇 Example 8 17.3 91 299 〇 Example 9 17.5 69 336 〇 Example 10 14.1 39 313 〇

[0130] As can be seen from Table 1, the water-based hot melt adhesive coated non-woven fabrics prepared in Examples 1 to 10 not only have good air permeability, but also have sufficient sealing strength after heat-sealing with the HDPE film 200. At the same time, when the HDPE200 film is torn off, the high-density polyethylene spunbond non-woven fabric substrate will not have fibers detached. For example, the water-based hot melt adhesive coated non-woven fabric 100 of Example 10 is subjected to a peeling test in a heat-sealed synthetic product. After the HDPE200 film is torn off from the water-based hot melt adhesive coated non-woven fabric 100, the cross-section of the HDPE200 film after tearing off and the surface of the non-woven fabric 100 are imaged at 500 times by a scanning electron microscope (SEM). Figure 2 and Figure 3 As shown, it shows that the water-based hot melt adhesive coating of the present invention still completely covers the surface of the non-woven fabric 100 and the surface of the HDPE film 200 after the peeling test, and the adhesive layer is stably disconnected without the substrate fiber falling off.

[0131] Although the present invention has been disclosed as above by way of embodiments, it is not intended to limit the present invention. Anyone skilled in the art should be able to make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be based on that defined in the attached claims.

Claims

1. A water-based hot melt adhesive comprising: 10 to 35 weight percent of a water-based thermoplastic resin; 20 to 45 weight percent of powdered wax; and 40 to 60 weight percent of a tackifier; The tackifier includes an emulsion tackifier and a powder tackifier, and the total amount of the powder of the water-based hot melt adhesive accounts for between 40 weight percent and 65 weight percent of the total weight of the water-based hot melt adhesive.

2. The water-based hot melt adhesive according to claim 1, wherein the powder wax accounts for between 40 weight percent and 75 weight percent of the total powder amount of the water-based hot melt adhesive and the powder viscosity enhancer accounts for between 25 weight percent and 60 weight percent of the total powder amount of the water-based hot melt adhesive.

3. The water-based hot melt adhesive according to claim 1, wherein the particle size of the powdered wax is between 3 microns and 50 microns.

4. The water-based hot melt adhesive according to claim 1, wherein the particle size of the powdered tackifier is between 3 microns and 50 microns. 5 . The water-based hot melt adhesive according to claim 1 , wherein the glass transition temperature of the water-based hot melt adhesive is between 0° C. and −80° C.

6. The water-based hot melt adhesive according to claim 1, wherein the glass transition temperature of the powder wax is less than 0°C and the melting point is between 70°C and 180°C, and the powder wax is selected from at least one of the group consisting of Fischer-Tropsch synthesis powder wax, polypropylene powder wax, polyethylene powder wax, oxidized polyethylene powder wax and microcrystalline wax, or a combination thereof.

7. The water-based hot melt adhesive according to claim 1, wherein the emulsion tackifier is a petroleum resin emulsion, a rosin ester and its derivative emulsion, a terpene resin and its modified resin emulsion, a thermoplastic phenolic resin emulsion, a low molecular weight polystyrene emulsion or an ethylene acrylic acid copolymer emulsion or a combination thereof; the powder tackifier is C5 petroleum resin powder, C9 petroleum resin powder, C5 / C9 copolymer petroleum resin powder, hydrogenated C9 petroleum resin powder or a combination thereof.

8. The water-based hot melt adhesive according to claim 1, wherein the amount of the powdered tackifier used is 20 weight percent to 65 weight percent of the total weight of the tackifier. 9 . The water-based hot melt adhesive according to claim 8 , wherein the powder thickener uses one or more powder thickeners.

10. The water-based hot melt adhesive according to claim 1, wherein the amount of the emulsion tackifier used is 35 weight percent to 80 weight percent of the total weight of the tackifier. 11 . The water-based hot melt adhesive according to claim 10 , wherein the emulsion viscosity enhancer uses one or more emulsion viscosity enhancers. 12 . The water-based hot melt adhesive according to claim 1 , wherein the glass transition temperature of the water-based thermoplastic resin is less than 0° C. and the melting point is between 150° C. and 300° C.

13. The water-based hot melt adhesive according to claim 1, wherein the water-based thermoplastic resin is at least one selected from the group consisting of ethylene-vinyl acetate, styrene-butadiene-rubber, styrene-butadiene-styrene block copolymer, styrene-acrylic acid copolymer, ethylene acrylic acid resin, polyacrylic acid resin, or a combination thereof. 14 . The water-based hot melt adhesive according to claim 13 , wherein the water-based thermoplastic resin uses one or more water-based thermoplastic resins.

15. A water-based hot melt adhesive, comprising 13 to 30 weight percent of a water-based thermoplastic resin, 22 to 40 weight percent of a powder wax, and 40 to 55 weight percent of a tackifier, wherein the tackifier comprises an emulsion tackifier and a powder tackifier and the total amount of powder in the water-based hot melt adhesive accounts for between 41 to 61 weight percent of the total weight of the hot melt adhesive.

16. A water-based hot melt adhesive coated nonwoven fabric, comprising an olefin-based spunbond nonwoven fabric substrate and a hot melt adhesive coating formed on at least one surface of the olefin-based spunbond nonwoven fabric substrate, wherein: The hot melt adhesive coating contains: 10 to 35 weight percent of a water-based thermoplastic resin; 20 to 45 weight percent of powdered wax; and 40 to 60 weight percent of a tackifier; The tackifier includes an emulsion tackifier and a powder tackifier, and the total amount of powder in the hot melt adhesive coating accounts for between 40 weight percent and 65 weight percent of the total weight of the hot melt adhesive coating.

17. The water-based hot melt adhesive coated non-woven fabric according to claim 16, wherein the air permeability of the water-based hot melt adhesive coated non-woven fabric is less than 120 seconds and the sealing strength is greater than 220g / 15mm.

18. The water-based hot melt adhesive coated nonwoven fabric according to claim 16, wherein the coating amount of the hot melt adhesive coating on the olefin-based spunbond nonwoven fabric substrate is 8 g / m 2 Up to 20g / m 2 between.

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