TWI853607B - Release coating composition - Google Patents

Abstract

The disclosure involves a release coating composition. Compared with conventional silicone release coating compositions, the release coating composition according to the aspect of the disclosure when being manufactured into a release film can achieve a wide range of peeling force and exhibit excellent stability over time.

Description

Release coating composition

This disclosure relates to a water-based release coating composition.

Release films are generally used as protective films to protect adhesive components from pollutants in the atmosphere or unwanted adhesions, and generally adopt a structure in which a release layer is formed on a polyester base film.

In addition, release films are usually attached to adhesive films or tapes as a protective film for preventing adhesion to undesired adhesion or contamination by dust and other foreign matter before the adhesive is applied. Alternatively, release films are used to prevent molds and molded products from being adhered in hot press molding processes such as printed circuit boards and in-mold forming, or used as coating materials for applying various resin materials such as ceramic slurry on the peeling surface of the release film and as intermediates for lamination to protect various resin layers coated on other materials. In particular, release films are used as carrier films for uniformly and thinly applying ceramic slurry on green sheets as components in multi-layer ceramic capacitors (MLCCs). MLCC is a type of capacitor used to store current or stabilize current, and is widely used in portable electronic devices due to its small size and large capacitance. In particular, demand has greatly increased due to the recent surge in smartphones and tablet PCs. These MLCCs are made by alternately stacking green sheets and internal metal electrodes in tens or hundreds of layers and then connecting external electrodes, and their sizes range from less than 1mm to several nm.

The green sheet used in MLCC is formed by uniformly applying ceramic slurry on a carrier film as a support and then sintering it. As the carrier film of the green sheet, a biaxially stretched polyester film with excellent mechanical strength, dimensional stability, heat resistance and cost competitiveness is used. The release film is prepared by applying a polymer silicone release layer to one side of the biaxially stretched polyester film.

Recently, with the trend toward miniaturization and higher capacity of MLCC, it is necessary to make the green sheet thinner and stack the ceramic slurry into more layers. However, if the peeling force of the release film used to manufacture MLCC is too low, the ceramic slurry may be separated from the release film prematurely. Conversely, if the peeling force of the release film is too high, cracks or breakage may occur in the green sheet when the release film is removed. Therefore, the release film used for MLCC is particularly required to have such a property that the film can be peeled by an appropriate peeling force.

In addition, if the organic solvent used in the manufacture of the ceramic slurry is not fully volatilized and remains in the release layer, stains such as orange peel appear on the surface of the green sheet. This problem may be attributed to the roughness factor, and it also occurs when the solvent of the ceramic slurry remains in the release layer due to the low solvent resistance of the release layer. Therefore, it is necessary to improve the release film. Preventing such green sheet defects in advance is related to the improvement of MLCC reliability, so the function of the release film in the manufacture of MLCC is very important.

This disclosure provides a technology for a release coating composition. Specifically, the release coating composition can be used to manufacture a release film.

This disclosure is intended to provide release coating compositions that can achieve a wide range of release forces.

In addition, the present disclosure aims to provide a release coating composition that contains a silicone emulsion and can be cured in an aqueous system at low temperature.

According to one aspect, the present disclosure provides a release coating composition.

In one aspect, the release coating composition can be a water-based release coating composition.

In one aspect, the water-based release coating composition may be a composition that can be cured at a temperature of 150°C or less, and may include: a silicone emulsion component (A) including polydimethylsiloxane (PDMS); a component (B) including two or more functional groups that can undergo a condensation reaction with the silicone emulsion component in a single molecule; and an acid catalyst.

In one aspect, component (B) can form a Si-O-R-N bond structure through a condensation reaction of the silicone emulsion component, wherein R is an alkyl group having 1 to 4 carbons.

In one aspect, the functional group contained in the component (B) may be an amine group or an amine-derived functional group.

In one aspect, the component (B) may be a melamine component, which is a melamine compound of Chemical Formula 1, an oligomer thereof, a polymer thereof, or a combination thereof.

Wherein, X each represents a hydrogen atom, -CH ₂ OH or -CH ₂ -OR, and may be the same or different. R represents an alkyl group having 1 to 8 carbon atoms, and may be the same or different. At least one X is -CH ₂ -O-CH ₃ .

In one aspect, the acid catalyst can be selected from hydrochloric acid, sulfuric acid, nitric acid, phosphoric acid, oxalic acid, acetic acid, formic acid, methanesulfonic acid, trifluoromethanesulfonic acid, isoprenesulfonic acid, camphorsulfonic acid, hexanesulfonic acid, octanesulfonic acid, nonylsulfonic acid, decanesulfonic acid, hexadecanesulfonic acid, dinonylnaphthalenesulfonic acid, dinonylnaphthalene disulfonic acid, benzenesulfonic acid, alkylbenzenesulfonic acid, p-toluenesulfonic acid, melamine _ZnI2 , melamine trisulfonic acid (MTSA), cumenesulfonic acid, dodecylbenzenesulfonic acid, naphthalenesulfonic acid, nonylnaphthalenesulfonic acid, methyl acid phosphate, Ethyl acid phosphate, propyl acid phosphate, isopropyl acid phosphate, butyl acid phosphate, butoxyethyl acid phosphate, octyl acid phosphate, 2-ethylhexyl acid phosphate, decyl acid phosphate, lauryl acid phosphate, stearyl acid phosphate, oleyl acid phosphate, behenyl acid phosphate, phenyl acid phosphate, nonylphenyl acid phosphate, cyclohexyl acid phosphate, phenoxyethyl acid phosphate, alkoxy acid phosphate At least one of 1,2-dimethoxy-1,2-diol-1,2-diol-1,2-diol-1,2-diol-1,2-diol-1,2-diol-1,2-diol-1,2-diol-1,2-diol-1,2-diol-1,2-diol-1,2-diol-1,2-diol-1,2-diol-1,2-diol-1,2-diol-1,2-diol-1,2-diol-1,2-diol-1,2-diol-1,2-diol-1,2-diol-1,2-diol-1,2-diol-1,2-diol-1,2-diol-1,2-diol-1,2-diol-1,2-diol-1,2-diol-1,2-diol-1,2-diol-1,2-diol-1

In one aspect, the weight ratio of the component (B) to the acid catalyst may be 100:5 to 100:30, 100:10 to 100:20, or 100:10 to 100:15.

In one aspect, the water-based release coating composition may contain the component (B) and the silicone emulsion in amounts of 0.2 wt % to 1.0 wt % and 0.02 wt % to 9 wt %, respectively, based on the total weight of the composition.

In one aspect, the weight ratio of component (B) and silicone emulsion can be 100:10 to 100:900 based on solid content.

In one aspect, the water-based release coating composition may further include at least one of an antistatic agent, a conductivity enhancer, a pH adjuster, and an antifouling agent.

In one aspect, the antistatic agent may be at least one selected from PEDOT, PEDOT:PSS, polyaniline, polypyrrole, quaternary ammonium salt, sulfonate and phosphate.

In one aspect, the pH adjuster can be at least one selected from sodium hydroxide, potassium hydroxide, calcium hydroxide and ammonia.

In one aspect, the water-based release coating composition may contain 0.1 wt % to 30 wt % of an antistatic agent, 0.01 wt % to 0.3 wt % of a pH adjuster, or 0.1 to 0.3 wt % of an antifouling agent, based on the total weight of the composition.

In one aspect, the water-based coating composition may include water or a combination of water and an organic solvent, wherein the water and the organic solvent may be combined in a weight ratio of 50:50 or more, 60:40 or more, 70:30 or more, 80:20 or more, 90:10 or more, 95:5 or more, or 99:1 or more of water to organic solvent.

In one aspect, the water-based coating composition can be used to make a release film for a protective film in the form of a sticky or adhesive film or tape, a release film for a hot press molding process, a coating material for coating a resin material, a release liner to be bonded to protect a resin layer coated on other materials, or a release film for a ceramic green sheet manufacturing process.

The release coating composition according to aspects of the present disclosure can achieve a wide range of release forces when made into a release film and can exhibit excellent stability over time. These effects are even more superior than conventional silicone-based release coating compositions.

Release coating compositions according to aspects of the present disclosure can be cured in aqueous systems at low temperatures, even if they contain silicone emulsions. This effect is even more superior than conventional compositions containing silicone emulsions that can only be cured at high temperatures.

FIG. 1 is a schematic diagram illustrating film formation of a conventional silicone-based release coating composition and a water-based release coating composition according to an embodiment of the present disclosure by low-temperature curing at 150° C. or less.

FIG2 shows the FT-IR spectrum of a release film according to an embodiment of the present disclosure.

The various embodiments described herein are exemplified for the purpose of clarifying the technical concept of this disclosure, and are not intended to limit this disclosure to any specific embodiment. The technical concept of this disclosure includes various modifications, equivalents, substitutions, and embodiments selectively combined with all or part of the individual embodiments described in this document. In addition, the scope of the technical concept of this disclosure is not limited to the various embodiments described below and their detailed descriptions.

Unless otherwise stated, the terms used in this document (including technical terms or scientific terms) may have the meanings commonly understood by ordinary technicians in the field to which this disclosure belongs.

1. Basement membrane

In one aspect of the present disclosure, any membrane commonly used in the field of release membranes can be used as the base membrane (which is a component of the release membrane) without limitation.

In one aspect, the base film may be formed of a polyester polymer, but the base film on which the release coating composition is applied is not limited to a polyester film. Specific examples of polyester polymers include, but are not limited to, polyethylene terephthalate polymers, polybutylene terephthalate polymers, polyethylene naphthalate polymers, polyphenylene sulfide polymers, polyetheretherketone polymers, polyophthalamide polymers, polyimide polymers, polysulfone polymers, polyethersulfone polymers, polyetherimide polymers, or combinations thereof, but are not limited thereto.

In one aspect, the polyester polymer may be a polyester obtained by a condensation reaction of an aromatic dicarboxylic acid and an aliphatic diol. In one aspect, the aromatic dicarboxylic acid may be isophthalic acid, phthalic acid, terephthalic acid, 2,6-naphthalene dicarboxylic acid, adipic acid, sebacic acid, hydroxy dicarboxylic acid (e.g., p-hydroxybenzoic acid, etc.) or a combination thereof, but is not limited thereto. In one aspect, the aliphatic diol may be ethylene glycol, diethylene glycol, propylene glycol, butanediol, 1,4-cyclohexanedimethanol, neopentyl glycol or a combination thereof, but is not limited thereto.

In one aspect, two or more types of the above aromatic dicarboxylic acids and aliphatic diols may be used together for the polyester polymer, and a copolymer containing a third component may also be used. However, in consideration of heat resistance, chemical resistance, mechanical strength, and cost effectiveness, polyethylene terephthalate may be preferred. In one aspect, the base film may preferably be a biaxially oriented polyethylene terephthalate film.

In one aspect, the thickness of the base film can be 10 μm to 200 μm , but is not limited thereto.

In one aspect, the release coating composition can be applied to at least one surface of a substrate film to form a release layer.

2. Component (B)

According to one aspect of the present disclosure, a release coating composition uses component (B) as the backbone component of the release layer after curing. The use of component (B) allows for a hard release layer coating due to the high crosslinking density and exceeds the hardness level typically achieved with conventional silicone-based release coating compositions. This is particularly effective for producing a hard release layer coating in order to adjust the peeling force to a desired level in the ceramic green sheet manufacturing process for MLCC production.

Conventional silicone release coating compositions generally contain only silicone materials, such as silicone emulsions. However, silicone emulsions are challenging to cure at low temperatures and require high temperatures above about 230°C for effective curing. Therefore, compositions containing only silicone emulsions are difficult to use at temperatures of about 150°C. FIG. 1 is a schematic diagram illustrating that both a conventional silicone release coating composition and a water-based coating composition according to an embodiment of the present disclosure form a film by low-temperature curing at a temperature below 150°C. Referring to FIG. 1, when used at a temperature below 150°C, a conventional silicone release coating composition exhibits low adhesion to a substrate film (e.g., a PET film) (see the left figure).

For example, the film manufacturing process can be divided into an off-line process, which involves unrolling the finished film material, applying a coating thereon, and then rewinding it to produce a film, and an on-line process, which forms the film from the polymer while coating the film during the sheeting stage after polymer extrusion. During the off-line process, the maximum drying temperature is about 150°C, while the on-line process can have a drying temperature of about 210 to 240°C during the film stretching stage. Therefore, non-aqueous solvents (i.e., solvent-based solvents) are generally used for curing at temperatures below 150°C in the off-line process.

However, due to environmental considerations, when the solvent used for the above composition is water-based, curing must occur at a temperature below about 150°C (e.g., below about 130°C). Although emulsions are suitable formulations for use in water, when silicone emulsions are used, there is a problem of difficulty in curing at temperatures below 150°C as described above. In addition, even after curing, the rub-off characteristics and adhesion of the release film may be reduced. Introducing a surfactant to solve this problem may inhibit curing.

Containing a component (B) having two or more functional groups capable of condensation reaction with a silicone emulsion component, a release coating composition according to one aspect of the present disclosure can achieve high curing at a temperature below 150°C and can exhibit excellent physical properties, such as rub-off characteristics. This enables the use of water-based emulsions in an off-line process. Referring to FIG. 1 , component (B) (e.g., melamine component) is used to induce a phase separation curing reaction, allowing the production of a film with excellent adhesion and high curing (see right figure).

In one aspect, component (B) can form a Si-O-R-N bond structure (wherein R is an alkyl group having 1 to 4 carbon atoms) through a silicone emulsion condensation reaction.

_For example _, R can be _{-CH2- , -CH2CH2- , -CH2CH2CH2- ,} or _{-CH2CH2CH2CH2CH2- .}

In one aspect, the functional group contained in component (B) may be an amine group or an amine derivative functional group.

In one aspect, component (B) is not limited as long as it has two or more functional groups capable of condensation reaction with the silicone emulsion component in a single molecule. Generally, component (B) may be a melamine component. In particular, component (B) may be an alkyl etherified melamine compound obtained by reacting melamine and formaldehyde and then reacting the resulting hydroxymethyl melamine with an alcohol having an appropriate carbon atom in the presence of an acidic catalyst.

In one aspect, component (B) may represent a melamine compound having a structure of Chemical Formula 1, an oligomer thereof, a polymer thereof, and/or a combination thereof.

Wherein, X each represents a hydrogen atom, -CH ₂ OH or -CH ₂ -OR, and may be the same or different. R represents an alkyl group having 1 to 8 carbon atoms, and may be the same or different. At least one X is -CH ₂ -O-CH ₃ .

In one aspect, X may all be _-CH2 -O- _CH3 , and the melamine compound may be fully etherified methylated melamine, melamine oligomers and/or melamine polymers.

In one aspect, various commercially available and widely used products can be used as component (B). For example, Cymel 300, Cymel 301, Cymel 303LF, Cymel 350, or Cymel 370N (all products from Allnex) can be used without limitation. Commercially available products can be used alone or in combination.

In one aspect, the content of component (B) may be about 0.2 wt% to about 1.0 wt%, specifically about 0.2 wt% to about 0.8 wt%, about 0.3 wt% to about 0.7 wt%, about 0.4 wt% to about 0.6 wt%, or about 0.5 wt% to about 0.6 wt%, based on the total weight of the composition. If the content of component (B) is less than the minimum value, the desired curing effect, i.e., the effect of keeping the release layer hard and reducing the peeling force of the release film from the green sheet, may be weakened, and the peeling force may not be adjusted as desired. In addition, if the curing of component (B) is not properly performed, the stability of the release film may decrease over time. Therefore, the content of component (B) is required to meet the weight ratio of the acid catalyst mentioned below.

In one aspect, the total acid value of component (B) may be 390 to 780 mg KOH/g, specifically at least 400 KOH/g, 450 KOH/g, 500 KOH/g, 550 KOH/g, 600 KOH/g, 650 KOH/g, 700 KOH/g or 750 KOH/g, or at most 730 KOH/g, 680 KOH/g, 630 KOH/g, 580 KOH/g, 530 KOH/g, 480 KOH/g or 430 KOH/g, but is not limited thereto.

3. Silicone emulsion components

In one aspect of the present disclosure, the silicone emulsion component can be used as a binder or a peeling control agent in a release coating composition. Because the molecular weight of the monomer is low, component (B) forms a dense cross-linked structure after curing and has a high cross-linking density, thereby increasing the hardness of the release layer during coating. As the hardness of the release layer increases, the peeling force of the green sheet decreases. In order to solve this problem, curing with a silicone emulsion component containing a peeling group such as Si- _CH3 and having soft properties can reduce the hardness of the release layer and increase the softness of the release layer. As described above, the peeling force of the release film increases with the increase of the softness of the release layer. Due to the combination of component (B) and the silicone emulsion component, the present disclosure shows an effect of achieving a wide range of peeling force, particularly a wide range of 1-day peeling force at room temperature.

The silicone emulsion component can form a Si-O-N bond structure through a condensation reaction with component (B), and the formed component (B)-silicone emulsion component copolymer and its structure can increase the softness of the release layer and increase the stability over time.

For example, the melamine component of Chemical Formula 1 may have up to six functional groups. At this time, the _NX2 group in the melamine component may form a Si-ON bond structure through a condensation reaction with the silicone emulsion component.

For a typical silicone release film, the peeling force is increased by adding a silicone polymer component, but if the content of the silicone polymer component exceeds 50% by weight based on the total weight of the composition, serious problems arise with stability over time. Over time, the silicone polymer component that should exist on the surface of the release layer is impregnated into the interior of the release layer. Unlike conventional silicone release films, the release coating composition of the present disclosure has a copolymer of component (B) and a silicone emulsion component as described above, and forms a cross-linked network structure, so that the release group can continue to be retained without being leached from the surface of the release layer to the inside, and thus can exhibit excellent stability over time.

In one aspect, the silicone emulsion component is not limited as long as it can form a cross-linked network structure and provide softness when combined with component (B). For example, the silicone emulsion component is not particularly limited, but it may not contain a side chain other than the main chain.

In one embodiment, the silicone emulsion component may not contain polyalkylene glycol (e.g., polyethylene glycol, PEG).

In one embodiment, the silicone emulsion component may not contain hydroxyl groups, polyether groups, and polyester groups.

In one embodiment, the silicone emulsion component may not contain alkenyl groups.

If a silicone emulsion containing a branched chain is used, the peeling property can be limited to heavy peeling (over 200g based on TESA7475 tape). Therefore, the film using this composition can be limited to heavy peeling areas, such as MLCC. However, as described previously, the silicone emulsion component of the present disclosure does not contain a branched chain, such as a polyalkylene glycol, a hydroxyl group, a polyether group, a polyester group, an alkenyl group, etc. Therefore, even if component (B) is used for curing, a surface of a release layer can be formed with the Si- _CH3 component, just like when conventional silicone is used for curing. Therefore, the coating composition can be used in various applications, such as in light peeling areas as well as heavy peeling areas (such as for MLCC).

For example, the silicone emulsion component may be polydimethylsiloxane (PDMS), but is not limited thereto. For example, the silicone emulsion component may be branched polydimethylsiloxane, but is not limited thereto.

In one embodiment, the ratio of Si-VI to Si-H in the silicone emulsion component may be 1:1.5 to 1:2.5. For example, the ratio of Si-Vi to Si-H in the silicone emulsion component may be 1:1.6 to 1:2.3. Here, "Si-VI" means a silicon-vinyl group bond, and "Si-H" means a silicon-hydrogen bond. If the ratio of Si-VI:Si-Hi in the silicone emulsion component is less than 1:1.5, the composition may not be sufficiently cured and the residual adhesion and substrate adhesion may be poor. If the ratio of Si-VI:Si-Hi in the silicone emulsion component exceeds 1:2.5, and the content of Si-H becomes too much, Si-H may react with other components (e.g., hydroxyl groups, etc.), and the stripping force may increase over time, and the stability over time may decrease.

In one embodiment, the content of the silicone emulsion component may be 0.02 wt% to 9 wt%, 0.02 wt% to 8 wt%, 0.03 wt% to 7 wt%, 0.04 wt% to 6 wt%, or 0.05 wt% to 6 wt%, based on the total weight of the composition. If the silicone emulsion component is used in an amount exceeding the maximum value, component (B) may not be completely cured, and the uncured silicone emulsion component or component (B) may rise to the surface of the release layer, resulting in poor rub-off characteristics of the release film (i.e., adhesion or tackiness of the release layer to the substrate film). If the silicone emulsion component is used in an amount exceedingly less than the minimum value, an interconnected network structure may not be properly formed by the curing reaction, and it may be impossible to achieve the desired peeling force or aging stability.

In an embodiment, the silicone emulsion component may further include a metal catalyst. For example, the metal catalyst may be an alkali metal catalyst, an alkaline earth metal catalyst, or a rare earth metal catalyst, but is not limited thereto. For example, the metal catalyst may be a platinum catalyst, but is not limited thereto.

In one aspect, the weight ratio of component (B) to the silicone emulsion may be 100:10 to 100:900 based on the solid content, and may be a weight ratio existing between the upper and lower limits mentioned above.

4. Acid catalyst

In one aspect, any acid catalyst can be used without limitation as long as it is known to catalyze component (B) or the crosslinking reaction between component (B) and the silicone emulsion component. For use in the present disclosure, an appropriate selection can be made therefrom. Examples of acid catalysts include: inorganic acids such as hydrochloric acid, sulfuric acid, nitric acid, phosphoric acid, etc.; organic acids such as oxalic acid, acetic acid, formic acid, methanesulfonic acid, trifluoromethanesulfonic acid, isoprenesulfonic acid, camphorsulfonic acid, hexanesulfonic acid, octanesulfonic acid, nonanesulfonic acid, decanesulfonic acid, hexadecanesulfonic acid, dinonylnaphthalenesulfonic acid, dinonylnaphthalene disulfonic acid, benzenesulfonic acid, alkylbenzenesulfonic acid, p-toluenesulfonic acid, melamine ZnI ₂ , melamine trisulfonic acid (MTSA), cumene sulfonic acid, dodecylbenzene sulfonic acid, naphthalene sulfonic acid, nonylnaphthalene sulfonic acid, methyl acid phosphate, ethyl acid phosphate, propyl acid phosphate, isopropyl acid phosphate, butyl acid phosphate, butoxyethyl acid phosphate, octyl acid phosphate, 2-ethylhexyl acid phosphate, decyl acid phosphate, lauryl acid phosphate, stearyl acid phosphate, oleyl acid phosphate, behenyl acid phosphate, phenyl acid phosphate, nonylphenyl acid phosphate, cyclohexyl acid phosphate , phenoxyethyl acid phosphate, alkoxypolyethylene glycol acid phosphate, bisphenol A acid phosphate, dimethyl acid phosphate, diethyl acid phosphate, dipropyl acid phosphate, diisopropyl acid phosphate, dibutyl acid phosphate, dioctyl acid phosphate, di-2-ethylhexyl acid phosphate, dilauryl acid phosphate, distearyl acid phosphate, diphenyl acid phosphate, dinonylphenyl acid phosphate, etc.; and thermal acid generating agents, such as cobalt salts, benzothiazolium salts, ammonium salts, phosphonium salts, etc., but not limited thereto. The acid catalyst component can be used alone or in combination.

In one aspect, the weight ratio of component (B) to the acid catalyst may be 100:5 to 100:30, 100:10 to 100:20, or 100:10 to 100:15, and may be between the upper and lower limits described above. If the acid catalyst is used in an amount less than the minimum value of the weight ratio, the curing reaction may not occur properly, and if it is used in an amount exceeding the maximum value, over-curing may occur. Both of these situations result in poor stability over time. Therefore, in order to obtain excellent stability over time, it is preferred that the weight ratio of component (B) to the acid catalyst falls within the above range.

5.Solvent

In one aspect, the release coating composition can be a water-based release coating composition. In one aspect, the term "water-based" means an aqueous solution or dispersion, and the solvent component of the composition can be water alone or in combination with an organic solvent as described below.

On one hand, since the release coating composition is water-based, the release layer formed therefrom can fundamentally reduce the emission of volatile organic compounds (VOC) and meet environmental requirements. In addition, the release coating composition can be easily used in a mixture with a water-based antistatic agent and other water-based additives, and has the advantage of realizing the antistatic ability and releasability of the release film as a one-component composition.

In one aspect, the release coating composition may also include a water-based solvent. The water-based solvent may be water or a combination of water and an organic solvent. The combination ratio of water to organic solvent may be 50:50 or higher, 60:40 or higher, 70:30 or higher, 80:20 or higher, 85:15 or higher, 90:10 or higher, 95:5 or higher, or 99:1 or higher water:organic solvent weight ratio.

In one aspect, the organic solvent may be a well-known organic solvent widely used in the field of release membranes, and is not particularly limited as long as it is a solvent having good compatibility with water. For example, the organic solvent may be at least one selected from isopropyl alcohol, isobutyl alcohol, hexane, acetone, ethyl acetate, ethylene glycol, propylene glycol, butanediol, dipropylene glycol, polyethylene glycol, γ-butyrolactone, and combinations thereof, but is not limited thereto.

6. Other components

In one aspect, the release coating composition may include at least one of an antistatic agent, a conductivity enhancer, a pH adjuster, a surfactant, and an antifouling agent, as long as it does not change the desired properties of the release layer (e.g., peel strength).

(1) Antistatic agent and conductivity enhancer

In one aspect of the present disclosure, the antistatic agent not only provides antistatic properties to the release layer, but also prevents the adsorption of foreign substances. In the manufacturing process of the ceramic green sheet, there is a process of cutting and trimming the ceramic green sheet. Since the ceramic green sheet is in the form of beads aggregated together, beads fall off during the process of cutting the green sheet. Therefore, the antistatic property can prevent the bead shedding phenomenon caused by static electricity during the cutting process with the release film, which contributes to the processability of the ceramic green sheet manufacturing.

In one aspect, the antistatic agent may be an antistatic agent widely used in the field of release films, but is not particularly limited. For example, the antistatic agent may be selected from PEDOT (poly (3,4-ethylenedioxythiophene)), PEDOT:PSS (poly (3,4-ethylenedioxythiophene) polystyrene sulfonate), polyaniline, polypyrrole, quaternary ammonium salt, sulfonate and phosphate, but is not limited thereto.

In one aspect, the antistatic agent may be included in the release coating composition in the form of an aqueous solution of the antistatic agent containing a solid portion (the solid content may be 1.0% to 2.0% or 1.5% to 2.0%). At this time, the content of the aqueous solution containing the antistatic agent may be about 0.1% to about 30% by weight, about 1% to about 25% by weight, or about 5% to about 20% by weight based on the total weight of the composition, and may be present between the upper and lower limits described above. If the content of the antistatic agent exceeds the maximum value, defects of blue spots may appear in the release layer.

In one aspect, when included in the above content, the antistatic agent can provide a surface resistance of about 10 ⁴ to 10 ¹⁰ ohm/sq to the release layer.

In one aspect, the release coating composition may include a conductivity enhancer to achieve a desired level of surface resistance, i.e., antistatic properties. Such conductivity enhancers may assist the performance of the antistatic agent, and the use of a conductivity enhancer allows the release layer to achieve a desired level of surface resistance even with the use of less antistatic agent.

In one aspect, the content of the conductivity enhancer may be about 1 wt % to 20 wt %, about 1 wt % to 15 wt %, about 1 wt % to 10 wt %, about 1 wt % to 8 wt %, about 1.5 wt % to 8 wt %, about 1.5 wt % to 6 wt %, about 2 wt % to 6 wt %, about 2.5 wt % to 6 wt %, about 3 wt % to 6 wt %, or about 4 wt % to 6 wt %, based on the total weight of the composition. The content of the conductivity enhancer exceeding the maximum value may hinder the hardening of the release layer and cause the appearance and rub-off characteristics of the release layer to deteriorate to a level not reaching the desired level. If the content of the conductivity enhancer is excessively less than the minimum value, the effect may not be significant.

In one aspect, any conductivity enhancer can be used without limitation as long as it is widely known in the field of release films. For example, the conductivity enhancer can be selected from ethylene glycol, dimethyl sulfoxide, N-methyl-2-pyrrolidone, propylene glycol, butylene glycol, dipropylene glycol dimethyl ether, γ-butyrolactone, cyclobutane sulfone, dimethyl carbonate, and sorbitol, but is not limited thereto.

(2) pH adjuster

In one aspect of the present disclosure, the pH adjuster can adjust the pH of the composition to a desired level. The release coating composition may contain an antistatic agent that exhibits acidity. When the composition becomes acidic, neutral or alkaline components such as surfactants or silicone emulsion components may not function properly, so pH adjustment is required in this case. If the pH of the entire release coating composition is not adjusted, the stability of the composition itself over time may deteriorate rapidly, and release layer transfer degradation may occur some time after the composition is manufactured. For example, when a release coating composition is prepared and immediately applied to a base film to form a release layer, the appearance is good, but when about 4 hours after preparation and the release layer is formed, the appearance of the release layer becomes mottled.

In one aspect, any pH adjuster widely used in the field of release membranes can be used without specific limitation. For example, the pH adjuster can be at least one selected from sodium hydroxide, potassium hydroxide, calcium hydroxide, and ammonia water, but is not limited thereto. The pH adjuster can be an alkaline pH adjuster.

In one aspect, the content of the pH adjuster can be about 0.05 wt % to 0.3 wt %, about 0.1 wt % to 0.3 wt %, or about 0.15 wt % to 0.25 wt %, based on the total weight of the composition, and can be present between the upper or lower limits described above. If a pH adjuster exceeding the above maximum value is used, it may interfere with the curing of the release layer.

(3) Surfactant

In one aspect of the present disclosure, the surfactant can enhance the wettability of the release coating composition or its spreadability on the substrate film, and can increase the compatibility of component (B) and the silicone emulsion component. In one aspect, when water is used as the only solvent in the water-based release coating composition, more than two different types of surfactants can be used.

In one aspect, the surfactant may be a component known in the field of release membranes that can reduce surface tension, but is not limited thereto. For example, the surfactant may be a cationic surfactant, an anionic surfactant, an amphoteric surfactant, a nonionic surfactant, a silicone surfactant, a modified silicone surfactant, a fluorine surfactant, or a combination thereof, but is not limited thereto.

In one aspect, the cationic surfactant can be, for example, an alkyl trimethyl ammonium salt, a dialkyl dimethyl ammonium salt, or an alkyl benzyl dimethyl ammonium salt, but is not limited thereto.

In one aspect, the anionic surfactant can be, for example, a fatty acid salt, an alkylbenzene sulfonate, an alkyl sulfonate, an alkyl ether sulfonate, an alkyl polyoxyethylene sulfonate, or a monoalkyl phosphate, but is not limited thereto.

In one aspect, the amphoteric surfactant can be, for example, an alkyl dimethylamine oxide or an alkyl carboxy betaine, but is not limited thereto.

In one aspect, the non-ionic surfactant can be, for example, fatty acid ethanolamide, polyoxyethylene alkyl ether, polyoxyethylene alkylphenyl ether, sorbitol, sorbitan, sorbitan fatty acid ester, polyoxyethylene sorbitan fatty acid ester, polyoxyethylene fatty acid ester, glycerol fatty acid ester, propylene glycol fatty acid ester or polyoxyalkylene-modified silicone, but is not limited thereto.

In one aspect, the silicone surfactant may be, for example, polyether-modified silicone or polyglycerol-modified silicone, but is not limited thereto. The structure of such modified silicones may be classified into side chain modified type, two-end modified type (ABA type), single-end modified type (AB type), two-end side chain modified type, linear block type (ABn type), branched type, etc., and any of these structural modified silicones may be used.

In one aspect, the fluorine-based surfactant may be at least one selected from fluorine, a fluorine-containing silane compound, and a fluorine-containing organic compound, but is not limited thereto.

In one aspect, the amount of surfactant can be 0.05 wt % to 0.2 wt %, 0.1 wt % to 0.2 wt %, or 0.15 wt % to 0.2 wt %, based on the total weight of the composition, and can be present in an amount between the above upper or lower limits.

(4) Antifouling agent

In one aspect of the present disclosure, the antifouling agent can control the surface energy of the release layer and provide antifouling performance. If the surface energy difference between the base film and the release layer is small, the wettability and peelability of the release layer on the base film may be reduced, but the antifouling agent can prevent the reduction by reducing the surface energy of the release layer. In addition, since component (B) included in the release coating composition of the present disclosure has almost no slip (slip property), the antifouling agent can provide slip to the release layer.

In one aspect, the antifouling agent may be at least one selected from fluorine, a fluorine-containing silane compound, and a fluorine-containing organic compound, but is not limited thereto.

For example, the antifouling agent may not include self-emulsifying silicone. Self-emulsifying silicone does not dissolve well in water, making it difficult to use as an aqueous reagent. Therefore, the release coating composition according to the present disclosure may not include self-emulsifying silicone, but may include a silicone emulsion component.

In one aspect, the amount of the antifouling agent may be 0.1 wt % to 0.3 wt %, 0.15 wt % to 0.25 wt %, or 0.2 wt % to 0.25 wt %, based on the total weight of the composition, and may be present in an amount between the above upper or lower limits. If the antifouling agent used is less than the above minimum value, there may be a problem of residual stains when the release film is peeled off, and there may be a problem that green sheet slurry particles may remain in the release layer after the release film is peeled off from the green sheet.

7. Physical properties of release film

In one aspect of the present disclosure, a release film can be manufactured by applying a release coating composition to at least one surface of a base film to form a release layer, and the resulting release film can have the following properties. The following properties can be measured by the method described in the experimental example.

In one aspect, the release film can exhibit an instant tape peel force of 5 to 32 gf/in, and can exhibit a peel force within the above upper and lower limits. For example, it may be greater than or equal to 7 gf/in, 9gf/in, 11gf/in, 13gf/in, 15gf/in, 17gf/in, 19gf/in, 21gf/in, 23gf/in, 25gf/in, 27gf/in, 29gf/in, or 31gf/in, or less than or equal to 31gf/in, 29gf/in, 27gf/in, 25gf/in, 23gf/in, 21gf/in, 19gf/in, 17gf/in, 15gf/in, 13gf/in, 11gf/in, 9gf/in, or 7gf/in.

In one aspect, the release film can exhibit a room temperature 1-day tape peel force of 3 to 1000 gf/in, and can exhibit a peel force within the above upper and lower limits. For example, it may be greater than or equal to 10 gf/in, 50 gf/in, 100 gf/in, 200 gf/in, 300 gf/in, 400 gf/in, 500 gf/in, 600 gf/in, 700 gf/in, 800 gf/in, or 900 gf/in, or less than or equal to 900 gf/in, 800 gf/in, 700 gf/in, 600 gf/in, 500 gf/in, 400 gf/in, 300 gf/in, 200 gf/in, 100 gf/in, 50 gf/in, or 20 gf/in. Such a release film may satisfy the peeling force of a light, heavy, or extra-heavy peel release film, and may be widely used in fields requiring such conditions. In one aspect, the release film exhibits a wide range of room temperature 1-day tape peel forces, a property that cannot be achieved with conventional silicone release films.

In one aspect, the release film can exhibit a green sheet peeling force of 1 to 3 gf/in, and can exhibit a peeling force within the above upper and lower limits. The green sheet peeling force can be measured by the method described in Experimental Example 1, and can represent the peeling force of a green sheet with a thickness of 3 μm .

Therefore, the release film according to one aspect of the present disclosure has the following advantages: it can achieve various levels (grades) of 1-day room temperature tape peeling strength, while achieving a certain range of light peeling strength based on instant tape peeling strength or green sheet peeling strength. Therefore, a type of release film can be used in various industrial fields that require different levels of 1-day room temperature tape peeling strength, and can also be used in industrial fields that require light peeling strength based on instant tape peeling strength or green sheet peeling strength, so that it can be used for various purposes.

In one aspect, the release film can have a silicone content of about 0.001 to about 0.2 g/m ² in the release layer as measured using an X-ray fluorescence analyzer.

In one aspect, the release film may exhibit a residual adhesion rate of about 94%, about 95%, or about 96% or more, and the residual adhesion rate may be measured by the method described in Experimental Example 4. In the process of peeling the release film, an adhesive such as a pressure-sensitive adhesive (PSA) or an optically clear adhesive (OCA) is generally attached to the release film before peeling the release film. However, during the release film peeling process, there may be a problem that uncured components present in the release layer of the release film are transferred and interfere with the adhesive properties of the adhesive. The release film of the present disclosure satisfies a residual adhesion rate of about 95% or more, providing an advantage of being usable even in fields requiring high standards.

In one aspect, the release film may have a surface energy of the release layer of about 19 to about 30 dynes/cm or about 19.5 to about 27 dynes/cm, and may exhibit surface energy values within the above upper and lower limits. The surface energy of the release layer may be measured by the method described in Experimental Example 5.

In one aspect, the release film can have a residual amount of volatile organic compounds of about 5 ppm or less, so that it can be used as an eco-friendly material.

8. Method for manufacturing release film

In one aspect of the present disclosure, the method of manufacturing a release film is not particularly limited as long as it involves forming a release layer by using a release coating composition. For example, the release film can be obtained by applying a release coating composition to at least one surface of a base film, heating and drying it to cure component (B) and a silicone emulsion component contained in the release coating composition, thereby forming a release layer.

In one aspect, the method of applying the release coating composition can be a method known in the art and widely used in the field of release films. Examples of the method include, but are not limited to, gravure coating, rod coating, spray coating, spin coating, blade coating, roller coating, die coating, on-line coating, and off-line coating.

In one aspect, the applied release coating composition can be thermally cured by heat drying, wherein the heating temperature can be 110°C to 160°C, 120°C to 160°C, 130°C to 160°C, 140°C to 160°C, 150°C to 160°C, 145°C to 155°C, or 150°C to 155°C, and can be a temperature within the above range. In one aspect, the heating time can be 5 seconds to 60 seconds, 10 seconds to 40 seconds, 15 seconds to 30 seconds, or 20 seconds to 25 seconds, and can be a time within the above range.

In one aspect, after heat drying the release coating composition, the method may further include a post-curing process for curing the uncured component. For example, the post-curing process may include rolling the release film obtained by heat drying into a roll shape and then treating it at 40° C. to 60° C. for 1 to 5 days. The treatment temperature may be 40° C. to 60° C., 45° C. to 55° C., 47° C. to 53° C., 49° C. to 53° C., 50° C. to 53° C., or 50° C. to 51° C., and the treatment time may be 1 to 5 days, 1.5 to 4.5 days, 2 to 4 days, 2.5 to 3.5 days, or 3 to 3.5 days. When the post-curing process is performed, the stability of the physical properties of the release film (e.g., peel strength, residual adhesion or rub-off characteristics) over time can be improved.

In one aspect, the release layer of the release film may be formed to a dry thickness of 0.01 to 2 μm or 50 nm to 500 nm.

In one aspect, the release film can be used for an adhesive, a semi-cured adhesive, a protective film, a coating material, a composite liner, a ceramic sheet for a laminated ceramic capacitor, a semi-cured resin or a prepreg for a printed circuit. The present disclosure will be clearly understood based on the aspects described above and the experimental examples or embodiments described below. Hereinafter, the present disclosure will be explained in detail by referring to the working examples described in the attached table so that ordinary technicians in this field can easily understand and reproduce the present disclosure. However, the experimental examples or embodiments described below are given only to illustrate the present disclosure, and the scope of the present disclosure is not limited to these experimental examples or embodiments.

[Implementation example]

1. Preparation of release coating composition

The release coating composition was prepared by mixing the following components. However, as shown in Table 1, the silicone emulsion component was used in various amounts relative to 100 parts by weight of component (B).

- Component (B) (melamine component) (manufacturer: SANWA CHEMICAL, product name: NIKALAC MW12LF) 0.1-3.0% by weight

- Silicone emulsion component (PDMS, manufacturer: DOW Chemical, product name: Sol-off 7946 emulsion) 0.01-26.4 wt%

- Acid catalyst (melamine catalyst) (manufacturer: Allnex, product name: Cymel® 4040 catalyst) 0.1-3.0 wt%

- Platinum catalyst (manufacturer: Dow Chemical, product name: Syl-off 7924) 0.01-24% by weight

- PEDOT solution (manufacturer: Heraeus, product name: Clevios PT2) 0.5-20 wt%

- 9% ammonia water (manufacturer: DUKSAN, South Korea) 0.1-0.5% by weight

- Surfactant (manufacturer: BYK, product name: BYK348) 0.01-0.3% by weight

- The remaining amount of distilled water

2. Manufacture of release film

The release coating composition thus prepared was applied to at least one surface of a polyethylene terephthalate substrate film (manufacturer: Toray Advanced Materials, product name: XD500) having a thickness of 50 μm using a bar coater. It was then cured by heat drying at a temperature of 150° C. for 30 seconds in a hot air dryer. In this way, a release film having a release layer formed on a substrate was manufactured.

[Comparison example]

1. Preparation of release coating composition

The release coating composition was prepared in the same manner as in the examples, but with some changes. In Comparative Example 1, the silicone emulsion component was not included. In Comparative Examples 2 to 5, each contained the same amount of silicone emulsion component as in Examples 1, 4, 6, and 7, but did not contain a melamine component. In Comparative Examples 6 and 7, a PEG-based silicone emulsion component (manufacturer: Silicone DNA, product name: SD-3667) was included in different amounts relative to 100 parts by weight of the melamine component as shown in Table 1, instead of the silicone emulsion component.

2. Manufacture of release film

The same procedure as in the embodiment is performed, but the release coating composition of the comparative example is used to produce a release film having a release layer formed therein.

[Experimental Example 1] Measurement of peeling force and aging stability of green sheets

To a mixture of 50 parts by weight of barium titanium oxide ( _BaTiO3 ; manufactured by Sakai Chemical Industries, product name: BT-03), 5 parts by weight of polyvinyl butyral (manufactured by Sekisui Chemical Industries, product name: S-Lec B.KBM-2) and 2 parts by weight of dioctyl phthalate (manufactured by Kanto Chemical, product name: dioctyl phthalate Cica Grade 1) were added 69 parts by weight of toluene and 46 parts by weight of ethanol, followed by ball milling and dispersion to prepare a ceramic slurry.

The ceramic slurry was uniformly coated on the surface of the release layer using an applicator, and the release film was stored at room temperature for 48 hours after being manufactured in the embodiments and comparative examples. The film was then dried in a dryer at 80°C for 1 minute. Finally, a ceramic green sheet having a thickness of 3 μm was obtained on the release film, and a release film having a ceramic green sheet attached thereto was manufactured.

The release films with the ceramic green sheets attached thereto were stored for 24 hours and 90 days respectively under the conditions of room temperature (23°C) and 50% humidity. Then, an acrylic adhesive tape (manufactured by Nitto Denko, product name: 31B tape) was adhered to the side of the ceramic green sheets opposite to each release film, and the films were then cut into 25 mm widths for use as measurement samples.

The sticky tape side of such a measurement sample is fixed to a flat plate, and the release film is peeled off from the ceramic green sheet at a peeling angle of 90° and a peeling speed of 500 mm/min using a tensile tester (ChemInstrument's AR-1000), and the peeling force (gf/25 mm) is measured. The average value of the 5 measurement results is shown in Table 1.

[Experimental Example 2] Measurement of tape peeling force

Using TESA7475 tape (manufactured by TESA, Germany), a standard tape widely used in the technical field of the present disclosure, the peeling force of the release film prepared by applying the release coating composition prepared in the above Examples and Comparative Examples was evaluated.

The standard adhesive tape TESA7475 was attached to the release coating surface of the release layer with a 2kg roller, and the peeling force was measured after 20 minutes at room temperature or after 24 hours at room temperature. The peeling force was measured 5 times at a peeling angle of 180° and a peeling speed of 12in/min using ChemInstrument's AR-1000 machine, and the average value was calculated.

[Experimental Example 3] Measurement of silicone content

The silicone content in the release layer of the release film prepared in the embodiment and the comparative example was measured using an X-ray fluorescence analyzer (XRF) (manufactured by OXFORD, product name: Lab X-3500).

[Experimental Example 4] Residual adhesion rate measurement

The measured samples of the release films prepared in the Examples and Comparative Examples were stored at 25°C and 65% RH for 24 hours, and then a standard tape Nitto 31B tape was attached to the release coating surface. The obtained sample was then pressed at a load of 20 g/cm ² for 24 hours at room temperature. After the tape adhered to the release coating surface was collected without contamination, the tape was attached to a smooth and clean polyethylene terephthalate (PET) film surface, reciprocatedly pressed once with a 2 kg tape roller, and then the peeling force was measured.

For comparison, a previously unused Nitto 31B tape was attached to a smooth and clean PET film surface, reciprocated and pressed once with a 2kg tape roller, and then the peeling force was measured.

The peeling force was measured as follows, and the residual adhesion rate was calculated according to Mathematical Formula 1 based on the measurement.

Measuring instrument: ChemInstrument’s AR-1000 machine

Measurement method: 180° peeling angle, peeling speed 30mm/min

<Mathematical formula 1> Residual adhesion rate (%) = [peeling force of the tape after being attached to the surface of the release layer / peeling force of the tape not in contact with the surface of the release layer] × 100

[Experimental Example 5] Surface energy measurement

Distilled water and diiodomethane were dropped on the release coating surface of the release film prepared in the embodiment and comparative example using a contact angle meter (product name: DSA-100 of KRUSS) to measure their respective contact angles. The measured contact angle values were then substituted into the Owens-Wendt model to calculate the surface energy.

[Experimental Example 6] Scratch test

After the release layer of each release film prepared in the embodiment and the comparative example was rubbed back and forth 10 times with a force applied by the thumb, the degree of change in the surface of the release layer was visually observed. Therefore, the rubbing-off characteristics were evaluated as follows.

◎: No change after evaluation

○: Slightly stained but no problem in using

△: The surface of the release layer is turbid

X: The exfoliation layer is peeled off

The results obtained based on the experimental examples are summarized in the following Table 1.

According to the results in Table 1, the release film obtained using the release coating composition according to aspects of the present disclosure showed excellent residual adhesion and rub-off characteristics, while achieving a wide range of tape room temperature 1-day peeling force, compared to those when the comparative examples were used. Therefore, the release film can be used in various industrial fields. In addition, the excellent residual adhesion and rub-off characteristics can confirm the possibility of low-temperature curing. For Comparative Examples 2 to 5, which are release films containing silicone-based release coating compositions used in conventional technologies, the residual adhesion and surface energy are not good, and the rub-off characteristics are very poor. In other words, using only silicone emulsion, the residual adhesion rate is low and the rub-off characteristics are not good, making it difficult to cure at low temperatures. In contrast, the combination of the melamine component and the silicone emulsion component in the embodiment can improve the insufficient curing ability, and the silicone emulsion can enhance the peeling property. This is because, although the silicone emulsion has a large molecular weight and its reaction site is limited to one at each end of the molecule, making low-temperature curing difficult, melamine has a low monomer molecular weight and can have up to 6 reaction sites, so it is highly reactive. Therefore, excellent rub-off characteristics that are difficult to achieve in conventional silicone release coating compositions can be achieved.

According to the working example of the aspects of the present disclosure, even when the peeling force from the green sheet is measured 90 days after preparation, it shows almost the same green sheet peeling force as the first day after preparation, indicating that it has very excellent stability characteristics over time.

Furthermore, it was demonstrated in working examples according to aspects of the present disclosure that a residual adhesion rate of at least 94% was obtained.

[Experimental Example 7] FT-IR spectroscopy measurement

FT-IR spectra were measured for release coatings prepared using the release coating composition of Example 1 and a conventional silicone-based release coating composition containing self-emulsifying silicone. Briefly, a Bruker VERTEX70 device was used, and the release coating compositions of the examples and comparative examples were coated on a glass plate, heat-dried in a hot air dryer at 150°C for 30 seconds to cure, and then 0.1 g of the coating was collected with a ceramic knife, and the spectrum was measured using the ATR method of the measuring device. The FT-IR spectrum measurement results are shown in FIG2.

As can be seen in FIG2 , unlike conventional methods, the release layer prepared from the release coating composition of the present disclosure exhibits high absorption peak intensities in the region of about 1020 cm ^-1 and about 1090 cm ^-1 due to the Si-O stretching absorption band, and exhibits high absorption peak intensities in the region of about 800 cm ^-1 due to the Si-C stretching absorption band. These peak intensities can explain that the release layer contains a component derived from PDMS.

Claims (15)

A water-based release coating composition capable of curing at a temperature of 150°C or lower, comprising: a silicone emulsion component (A) comprising polydimethylsiloxane (PDMS); a component (B) comprising two or more functional groups capable of undergoing a condensation reaction with the silicone emulsion component in a single molecule; and an acid catalyst, wherein the silicone emulsion component (A) does not contain a polyalkylene glycol or alkenyl group. A water-based release coating composition as described in claim 1, wherein the component (B) forms a Si-O-R-N bond structure through a condensation reaction of the silicone emulsion component, wherein R is an alkyl group having 1 to 4 carbons. The water-based release coating composition as described in claim 1, wherein the functional group contained in the component (B) is an amine group or an amine-derived functional group. The water-based release coating composition as claimed in claim 1, wherein the component (B) is a melamine component, and the melamine component is a melamine compound of Chemical Formula 1, an oligomer thereof, a polymer thereof, or a combination thereof:

wherein X each represents a hydrogen atom, -CH ₂ OH or -CH ₂ -OR and may be the same or different; R represents an alkyl group having 1 to 8 carbon atoms and may be the same or different; and at least one X is -CH ₂ -O-CH ₃ . The water-based release coating composition as claimed in claim 1, wherein the acid catalyst is selected from hydrochloric acid, sulfuric acid, nitric acid, phosphoric acid, oxalic acid, acetic acid, formic acid, methanesulfonic acid, trifluoromethanesulfonic acid, isoprenesulfonic acid, camphorsulfonic acid, hexanesulfonic acid, octanesulfonic acid, nonanesulfonic acid, decanesulfonic acid, hexadecanesulfonic acid, dinonylnaphthalenesulfonic acid, dinonylnaphthalene disulfonic acid, benzenesulfonic acid, alkylbenzenesulfonic acid, p-toluenesulfonic acid, melamine _ZnI2 , melamine trisulfonic acid (MTSA), cumene sulfonic acid, dodecylbenzene sulfonic acid, naphthalene sulfonic acid, nonylnaphthalene sulfonic acid, methyl acid phosphate, ethyl acid phosphate, propyl acid phosphate, isopropyl acid phosphate, butyl acid phosphate, butoxyethyl acid phosphate, octyl acid phosphate, 2-ethylhexyl acid phosphate, decyl acid phosphate, lauryl acid phosphate, stearyl acid phosphate, oleyl acid phosphate, behenyl acid phosphate, phenyl acid phosphate, nonylphenyl acid phosphate, At least one of cyclohexyl acid phosphate, phenoxyethyl acid phosphate, alkoxy polyethylene glycol acid phosphate, bisphenol A acid phosphate, dimethyl acid phosphate, diethyl acid phosphate, dipropyl acid phosphate, diisopropyl acid phosphate, dibutyl acid phosphate, dioctyl acid phosphate, di-2-ethylhexyl acid phosphate, dilauryl acid phosphate, distearyl acid phosphate, diphenyl acid phosphate, dinonylphenyl acid phosphate, a coronium salt, a benzothiazolium salt, an ammonium salt and a phosphonium salt. The water-based release coating composition as described in claim 1, wherein the weight ratio of the component (B) to the acid catalyst is 100:5 to 100:30. The water-based release coating composition as described in claim 1 contains the component (B) in an amount of 0.2 wt% to 1.0 wt% based on the total weight of the composition. The water-based release coating composition as described in claim 1 contains the silicone emulsion in an amount of 0.02 wt % to 9 wt % based on the total weight of the composition. A water-based release coating composition as described in claim 1, wherein the weight ratio of component (B) to silicone emulsion is 100:10 to 100:900 based on solid content. The water-based release coating composition as described in claim 1 also contains at least one of an antistatic agent, a conductivity enhancer, a pH adjuster and an antifouling agent. A water-based release coating composition as described in claim 10, wherein the antistatic agent is at least one selected from PEDOT, PEDOT:PSS, polyaniline, polypyrrole, quaternary ammonium salt, sulfonate and phosphate. A water-based release coating composition as described in claim 10, wherein the pH adjuster may be at least one selected from sodium hydroxide, potassium hydroxide, calcium hydroxide and ammonia water. The water-based release coating composition as described in claim 10 comprises at least one of the following based on the total weight of the composition: 0.1 wt% to 30 wt% of the antistatic agent, 0.01 wt% to 0.3 wt% of the pH adjuster, and 0.1 wt% to 0.3 wt% of the antifouling agent. The water-based release coating composition as described in claim 1 comprises water or a combination of water and an organic solvent, wherein the water and the organic solvent are combined in a weight ratio of 50:50 or higher. A water-based release coating composition as described in claim 1, wherein the water-based coating composition is used to manufacture a release film for a protective film in the form of a sticky or adhesive film or tape, a release film for a hot press molding process, a coating material for coating a resin material, a release liner to be bonded to protect a resin layer coated on other materials, or a release film for a ceramic green sheet manufacturing process.