JP2001172585A - Water-based releasing agent - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water-based releasing agent excellent in fastness. SOLUTION: The water-based releasing agent is obtained by admixing octadecyl vinyl ether and/or ethylenebisoleamide selected as a fastness-improving agent with a releasing component and an emulsifier. The compounded amount of the fastness-improving agent is 1-50 pts.wt. based on 100 pts.wt. of the releasing component.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an aqueous release agent.

[0002]

2. Description of the Related Art In adhesive tapes and labels, in order to protect the adhesive surface of a substrate made of paper or plastic sheet,
A protective sheet is adhered to the adhesive surface, or the protective sheet is wound in a roll. A release agent is applied to the back surface of the protective sheet or the base material to facilitate release during use.
Heretofore, so-called oily release agents have been used as such release agents using an organic solvent as a solvent, but so-called aqueous release agents using water as a solvent instead of an organic solvent have been proposed in view of environmental and hygienic problems. For example, JP-A-3-8678
8 and JP-A-9-324172.

[0003]

Recently, there has been a demand for printing characters or patterns on the back surface of the adhesive tape or the label in advance, or adding characters or patterns to the back surface later. Here, when the substrate is wound and used, a release agent is applied to the surface of the substrate. Since the tape or the label is used by attaching it to a desired partner, the back surface is constantly in contact with the outside or rubbing against the outside.
At this time, if the release agent is fragile, the shape of the characters and patterns on the back surface may not be visible. In particular, in a type in which a character or a pattern is later applied to the back surface, the release agent is required to have robustness so that the shape of the character or the pattern does not collapse.

[0004]

Means for Solving the Problems The present inventors have made intensive studies to solve the above-mentioned problems, and as a result, have found an excellent action of improving the rigidity of a predetermined waxy substance, and have reached the present invention. That is, an aqueous release agent comprising a release component, an emulsifier, and a fastness improver comprising octadecyl vinyl ether and / or ethylene bisoleic acid amide.

An aqueous release agent containing octadecyl vinyl ether and / or ethylene bisoleic acid amide as a fastness improver has excellent fastness, and the frictional force is repeatedly exerted on the back surface of the substrate coated with the aqueous release agent. Upon addition, the layer of aqueous release agent does not change at all.

Hereinafter, each element constituting the present invention will be described in detail. (Fastness improver) octadecyl vinyl ether (mp: 4
7 ° C) and / or ethylenebisoleic acid amide (mp:
(118 ° C.) is preferably 1 to 50 parts by weight based on 100 parts by weight of the peelable substance. If the amount of these fastness improvers is less than 1 part by weight, sufficient release property cannot be imparted to the release agent layer. On the other hand, if it exceeds 50 parts by weight, there is a possibility that the adhesiveness to the substrate is reduced or the printability to the release agent layer is reduced. A more preferred amount of the fastness improver is 5 to 30 parts by weight based on 100 parts by weight of the peelable substance. These fastness improvers may be used alone or in combination.

(Releasable component) As a releasable component, a general long-chain alkyl polymer or the like is also applied to the present invention. Among them, for example, as disclosed in JP-A-9-324172, the degree of polymerization is 300 to 5000, and the saponification degree is 50 mol% or more with respect to 1 equivalent of hydroxyl group of a vinyl acetate (co) polymer. A functional group that reacts with at least one of the above-mentioned hydroxyl groups selected from the group consisting of an isocyanate group, a carboxylic acid group, an acid halide group, a ketene group, an aldehyde group and an epoxy group, and the alkyl group has 6 to 30 carbon atoms. The long-chain alkyl compound is preferably reacted at a ratio of 0.5 equivalent or more to obtain a releasable component.

The vinyl acetate (co) polymer before saponification, which is one of the reactants constituting the peelable component, includes a homopolymer of vinyl acetate or a copolymer of vinyl acetate and a vinyl compound. Examples of the latter include vinyl acetate-ethylene copolymers and vinyl acetate-acrylic acid copolymers. If the degree of polymerization of the vinyl acetate (co) polymer before saponification is too low, the peeling performance will be poor, and if it is too high, the peelable substance component will be difficult to disperse in water.
Is limited to Preferably it is 800-2500. The vinyl acetate (co) copolymer is obtained by saponifying the vinyl acetate portion. When the degree of saponification is low, the amount of reactive hydroxyl groups is reduced and the peeling performance is deteriorated. Is limited to Preferably it is 60 mol% or more.

The long-chain alkyl compound, which is the other reaction component constituting the peelable component, is at least one selected from the group consisting of isocyanate groups, carboxylic acid groups, acid halide groups, ketene groups, aldehyde groups and epoxy groups. And reacts with hydroxyl groups of saponified vinyl acetate (co) polymer. When the number of carbon atoms in the long-chain alkyl group of the long-chain alkyl compound is reduced, the peeling performance is reduced. Preferably it is 8 or more. The long-chain alkyl compounds include, for example, octyl isocyanate, dodecyl isocyanate, octadecyl isocyanate, docosanyl isocyanate, and the like having an isocyanate group, and octanoic acid, dodecanoic acid, octadecanoic acid, docosan having a carboxylic acid group. Octanoyl chloride, dodecanoyl chloride, docosanoyl chloride, etc. as those having an acid halide group, octyl ketene dimer, dodecyl ketene dimer, octadecyl ketene dimer, docosanyl ketene dimer, etc. Octyl aldehyde, dodecyl aldehyde, octadecyl aldehyde, docosanyl aldehyde, etc. Ether, dodecyl glycidyl ether, octadecyl glycidyl ether, docosanyl glycidyl ether, respectively.

A long-chain alkyl compound is reacted with a saponified vinyl acetate (co) polymer to obtain a peelable component. In this reaction, when the proportion of the long-chain alkyl compound decreases, the peeling performance deteriorates. Therefore, the long-chain alkyl compound to be reacted with 1 equivalent of the hydroxyl group of the saponified vinyl acetate (co) copolymer is 0.5 equivalent or more. , Preferably at least 0.6 equivalent.

(Emulsifier) An emulsifier generally used for an aqueous release agent can be applied to the present invention. Among them, as the emulsifier, it is preferable to use a high molecular weight surfactant as described in JP-A-9-324172. That is, a polyalkyl (meth) acrylic acid homopolymer such as poly (meth) acrylic acid, butyl (meth) acrylate-acrylic acid copolymer, ethylene-acrylic acid copolymer, ethylene-methacrylic acid copolymer, or Copolymer: vinyl acetate-maleic anhydride copolymer, styrene-
Maleic acid copolymers such as maleic anhydride copolymer and diisobutylene-maleic acid copolymer; fumaric acid copolymers such as methyl (meth) acrylate-fumaric acid copolymer and vinyl acetate-fumaric acid copolymer Aromatic sulfonic acid formalin condensates such as naphthalene sulfonic acid formalin condensate, butyl naphthalene sulfonic acid formalin condensate, cresol sulfonic acid formalin condensate; polyalkylpyridinium salts such as poly N-methylvinylpyridinium chloride (vinyl pyridine and And polyacrylamide, polyvinylpyrrolidone, polyacryloylpyrrolidone, polyvinyl alcohol, polyethylene glycol; block polymers of polyoxyethylene and polyoxypropylene. ; Methylcellulose, cellulose derivatives such as carboxymethyl cellulose; gum arabic, arabinofuranosidase and polysaccharides derivatives such as junk emissions. These at least one can be used. In these, the carboxyl group and the sulfone group can be substituted with an alkali salt such as sodium, potassium, ammonium and the like. The weight average molecular weight of such a polymeric surfactant is preferably from 1,000 to 3,000,000, more preferably from 2000 to 400,000, in the case of an ionic surfactant, and preferably from 2000 to 3,000,000 in the case of a nonionic surfactant, More preferably, it is 4000 to 400,000. The amount of the emulsifier is from 1 to 100 parts by weight of the release component.
100 parts by weight are preferred, and more preferably 10 to 70 parts by weight.
Parts by weight.

(Additives) In addition to the above-mentioned fastness improver, releasable component and emulsifier, various additives are added to the aqueous release agent as required. Details of these additives are described in
As described in JP-A-324172. In the following paragraphs, the description of the publication is cited.

The fatty acid preferably has 10 to 30 carbon atoms, more preferably 12 to 26 carbon atoms. When the carbon number of the fatty acid is less than 10, the polarity becomes too high, and the fatty acid is separated from the release agent component or the melting point is lowered, so that the releasability of the obtained aqueous dispersion release agent or Reduces non-migratory properties. If the carbon number exceeds 30, the polarity becomes too low, it is difficult to disperse in water, the melt viscosity becomes too high,
After applying the obtained water-dispersed release agent to the base material, long-term heating is required in order to exhibit releasability and non-migratory property, which hinders the work process. Specific examples of fatty acids include dodecanoic acid (lauric acid), hexadecanoic acid (palmitic acid), octadecanoic acid (stearic acid), octadecenoic acid (oleic acid), icosanoic acid (arachidic acid), and docosanoic acid (behenic acid). )), And at least one of them can be used. In addition, these fatty acids are sodium hydroxide,
In the presence of an alkali metal or alkaline earth hydroxide such as barium hydroxide, the fatty acid naturally forms a salt thereof. Therefore, the fatty acid in the present invention includes a fatty acid salt. The amount of the fatty acid to be added is not particularly limited, but may be 1 to 50 parts by weight based on 100 parts by weight of the release agent component obtained by reacting the component (a) and the component (b). Preferably, it is more preferably 3 to 40 parts by weight. When the amount of the fatty acid added is less than 1 part by weight, it is difficult to uniformly and stably emulsify and disperse the release agent component in water when producing a water-dispersed release agent. In order to apply the dispersion release agent to the base material to exhibit release properties and non-migration properties, it takes a long time to heat, which hinders the work process. Conversely, when the amount of the fatty acid added exceeds 50 parts by weight, the non-migratory property of the resulting aqueous dispersion release agent decreases. The acid-modified polyolefin (co) polymer has a function of uniformly and stably emulsifying and dispersing the release agent component of the present invention in water, and has an acid value of preferably from 0.2 to 800, and more preferably from 10 to 800. ~ 200. When the acid value is less than 0.2, it is difficult to disperse itself in water, and when the acid value exceeds 800, it is easy to separate from the release agent component, and a uniform and stable aqueous dispersion release agent is used. Is difficult to obtain. The acid-modified polyolefin (co) polymer is not particularly limited, but ethylene, propylene, butene-
Copolymers of olefins such as 1 with vinyl monomers having polar groups such as acrylic acid, methacrylic acid, maleic acid, itaconic acid and vinylpyrrolidone, acrylic acid-modified polyethylene wax, chemically or physically oxidized Examples thereof include polyolefin (co) polymers such as polyethylene, polypropylene, and polybutene, and at least one of them is suitably used. In the copolymer of an olefin and a vinyl monomer having a polar group, the content of the polar vinyl monomer is not particularly limited,
It is preferably from 0.01 to 40 mol%, more preferably from 0.5 to 10 mol%. The degree of polymerization of the acid-modified polyolefin (co) polymer is not particularly limited, but is preferably from 10 to 2,000, and more preferably from 20 to 1,000. If the degree of polymerization is less than 10, the release property and non-migratory property of the obtained water-dispersed release agent are deteriorated because the polymer is in a softened state even at room temperature. Conversely, if the degree of polymerization exceeds 2,000, it becomes difficult to disperse in water, and it takes a long time to apply the obtained water-dispersed release agent to the base material and to exhibit release properties and non-migratory properties. Requires heating,
Disturbs the work process. Acid-modified polyolefin (co)
The melting point and melt viscosity of the polymer are not particularly limited, but the melting point is preferably 40 ° C. or more, and the melt viscosity at 140 ° C. is preferably 10,000 Pa · s or less. As described above, it is more preferable that the melt viscosity at 140 ° C. is 5000 Pa · s or less.
When the melting point is less than 40 ° C., the releasability and non-migration property of the obtained aqueous dispersion release agent become insufficient, and when the melt viscosity at 140 ° C. exceeds 10,000 Pa · s, the dispersion in water It becomes difficult to do. The amount of the acid-modified polyolefin (co) polymer to be added is not particularly limited, but is preferably 1 to 100 parts by weight of the release agent component obtained by reacting the component (a) and the component (b). It is preferably 50 parts by weight, more preferably 3 to 40 parts by weight. When the addition amount is less than 1 part by weight, it is difficult to uniformly and stably emulsify and disperse the release agent component in water when producing a water-dispersed release agent. It takes a long time to apply heat to the base material to exhibit release and non-migration properties, which hinders the work process. Conversely, if the addition amount exceeds 50 parts by weight, the non-migratory property of the resulting aqueous dispersion release agent will decrease. As the solvent, a hydrocarbon-based solvent such as octane or an aromatic-based solvent such as toluene is used, and is preferably 10 parts by weight or less based on 100 parts by weight of the whole aqueous dispersion release agent solution. If it exceeds 10 parts by weight, it is not preferable in terms of safety and health. A high boiling liquid substance has a boiling point of 1 at normal pressure.
It is not less than 00 ° C., the viscosity at room temperature is 100 Pa · s or less, and even when it is transferred to an adhesive layer of an adhesive processed product such as an adhesive tape,
It is preferable that the adhesive does not significantly impair the adhesive performance. When the boiling point is less than 100 ° C., the obtained water-dispersed release agent is easily volatilized when applied and dried.
Exhaust and a recovery device are required, leading to an increase in manufacturing cost. On the other hand, if the viscosity exceeds 100 Pa · s, the fluidity becomes low, and the effect of improving the wettability and the film forming property of the aqueous dispersion release agent becomes poor. As a high boiling point liquid substance,
Although not particularly limited, for example, naphthenic oils, lanolin, oligomers of olefins, vegetable oils,
Examples include process oils such as animal oils and mineral oils, liquid tackifying resins such as liquid rosin and turpentine, plasticizers such as polybutene and diisodecyl phthalate, and at least one of these can be used. As a general surfactant,
Nonionic surfactants, anionic surfactants, cationic surfactants, amphoteric surfactants and the like can be mentioned, and at least one of these can be used. Nonionic surfactants include, for example, polyoxyethylene alkyl phenyl ether; ether type such as polyoxyethylene alkyl ether; glycerin fatty acid ester, sorbitan fatty acid ester, sucrose fatty acid ester sugar type; polyethylene glycol fatty acid ester; Examples thereof include ester ether type such as oxyethylene sorbitan fatty acid ester and fatty acid alkanolamide type. Examples of the anionic surfactant include a carboxylic acid type such as a fatty acid monocarboxylate, N-acyloylglutamate, a sulfone such as an alkylbenzene sulfonate, a naphthalene sulfonate-formaldehyde condensate, and a dialkyl sulfosuccinate. Examples thereof include an acid type, a sulfate type such as an alkyl sulfate, and a phosphate type such as an alkyl phosphate. Examples of the cationic surfactant include, for example,
Amine salt types such as alkylamine salts, alkyltrimethylammonium salts, dialkyldimethylammonium salts,
Examples include quaternary ammonium salts such as alkyldimethylbenzylammonium salts. Examples of the amphoteric surfactant include carboxybetaine type such as N, N-dimethyl-N-alkylaminoacetic acid betaine and glycine type such as 2-alkyl-1-hydroxyethyl-1-carboxymethylimidazolinium betaine. Is mentioned. The cross-linking agent is not particularly limited as long as it can react with the release agent component by heat, light, etc. and cross-link it when applying a water-dispersed release agent to a substrate and forming a film. No, but for example
Examples include a polyvalent isocyanate compound, a blocked polyvalent isocyanate compound, a polyvalent epoxy compound, a polyvalent acryloyl compound, a polyvalent methylol compound, a polyvalent ionic metal, and a polyvalent aziridine compound, and at least one of them can be used.

(Production method) The production method of the aqueous release agent of the present invention is not particularly limited.
The release agent composition is heated and melted in advance, heated water is added thereto, and using a mixer such as a pressure kneader, a colloid mill, a high-speed stirring shaft or the like, a high shear is applied to obtain an average particle diameter of 1 μm.
After uniformly emulsifying and dispersing until the dispersion becomes as follows, the dispersion particles are cooled so as not to be fused and aggregated, and a method of obtaining a desired aqueous release agent (high-pressure emulsification method) or a method in which the release agent composition is dissolved in an organic solvent in advance Then, using a high-speed emulsifier, the solution and water are uniformly emulsified and dispersed until the average particle size becomes 1 μm or less using a high-speed emulsifier, and then the organic solvent is removed to obtain a desired aqueous release agent. (Solvent dissolving method), etc., and any method is suitably employed. Among them, a high-pressure emulsification method which does not require removal of an organic solvent and has a simple process is more preferably employed.
The specific procedure of the high-pressure emulsification method includes, for example, a release agent component, an acid-modified polyolefin copolymer, a fatty acid, and wax, if necessary, mixing optional additives, heating and melting, and then adding the melt. Heated water is added, and high shear is applied to disperse. First, a W / O emulsion (an emulsion in which water is dispersed in oil) is prepared, and hot water is further added thereto. In addition, the phase is inverted to form an aqueous release agent (O / W emulsion). Thereafter, the dispersion particles are cooled so as not to aggregate. The heating and melting temperature is not particularly limited, but is preferably 60 ° C. or higher, and more preferably pressurized to 120 ° C. or higher. or,
After the release agent composition is put into water at once without heating and melting it in advance, and under high pressure, at a temperature of about 120 ° C., it is subjected to high shear and uniformly emulsified and dispersed until the average particle diameter becomes 1 μm or less. Alternatively, a method of cooling to obtain a desired aqueous release agent may be adopted. In any of the high-pressure emulsification method and the solvent dissolution method, the mixing ratio of the release agent component and water is not particularly limited, but the release agent composition is 5 to 50% by weight, water is 95%. Preferably, it is about 50% by weight. When the content of the release agent composition is less than 5% by weight, the shearing effect at the time of emulsification and dispersion is reduced and the production efficiency is reduced. Conversely, when the content of the release agent composition exceeds 50% by weight, The viscosity becomes too high, making uniform emulsification and dispersion difficult. The aqueous release agent obtained through the emulsifying and dispersing step may be diluted with water, if necessary, as long as the storage stability is not impaired.

(Coating method of release agent) For the base material, for example, glassine paper, woodfree paper, kraft paper, cast paper, synthetic paper,
An impregnated paper or the like may be used, and one provided with a filling layer to suppress the penetration of the release agent is preferably used. The filling layer is, for example, polyvinyl alcohol, polyvinylpyrrolidone, polyethyleneimine, polyacrylate,
Adhesives such as starches, cellulose derivatives, urethane resins, acrylic resins, polyester resins, alkyd resins, melamine resins, etc., calcium carbonate, kaolin, aluminum hydroxide, heavy calcium carbonate, light calcium carbonate, titanium oxide, talc, satin white , Calcium sulfate,
Inorganic pigments such as barium sulfate, zinc oxide and silica, or organic pigments such as polypropylene resin, polyethylene resin, styrene resin, acryl-styrene resin, urea formalin resin, melamine-formalin resin, benzoguanamine resin, each alone or It can be used in combination. The coating method of the release agent is not particularly limited, for example, gravure direct method, gravure reverse method, bar coating method, roll coating method and the like,
It is appropriately applied to the filling layer surface of the base material and dried. The amount of the release agent applied is preferably from 1 to 10 g / m ² . If the coating amount is less than 0.1 g / m ² , uniform peeling performance may not be obtained. On the other hand, if it exceeds 10 g / m ² , it is necessary to dry at high temperature for a long time. Is not preferred. The temperature for drying the release agent is 9
0-180 degreeC is desirable.

[0016]

Embodiments of the present invention will be described below. (Synthesis of Releasable Component) Octadecyl isocyanate 6 was added to 10 g of polyvinyl alcohol (polymerization degree 1100, saponification degree 98 mol%) dispersed in 50 g of dehydrated xylene.
7 g and a catalyst (dibutyltin dilaurate) 0.01 g were added and reacted. This reaction solution was poured into 1000 g of methanol, and the white precipitate obtained was washed with methanol and then with hexane, and dried to obtain a peelable component (R1).

The aqueous release agent of Example 1 was prepared by the high-pressure emulsification method using the above-mentioned release component and the following composition. In the following release agent composition excluding water, an emulsifier is formed by the acid-modified polyolefin and the fatty acid salt. Removable component (R1) 135 g Emulsifier (sodium salt of carboxylic acid-containing vinyl polymer) 49 g Fatty acid salt (sorbitan monostearate) 1 g Rigidity improver (octatedecylvinyl ether) 15 g Water 775 g Octadecyl vinyl ether (mp)
47 ° C) instead of ethylenebisoleic amide (mp
118 ° C.) to obtain the aqueous release agent of Example 2.

(Comparative Example) Comparative Example 1 in which the fastness improving agent was omitted from the above Examples was used. Instead of the fastness improving agent, paraffin WAX (mp 46 ° C), lanolin ester (mp 47 ° C) and oleic amide ( (mp 74 ° C.) were used as Comparative Examples 2, 3, and 4, respectively.

(Evaluation Test) (1) Evaluation of Adhesiveness (Evaluation of Robustness) The robustness of the release agent was determined by applying the release agent composition to a substrate and drying it, and storing it at 65 ° C. and 80% humidity for 2 days. The release agent-coated surface is treated with a cotton cloth having a weight of 1 kg / cm ² for 20 reciprocations (a stroke of 5 cm and 60 reciprocations / min.), And is evaluated according to the following criteria. <Evaluation Criteria> ○: Good adhesion Δ: Slightly insufficient adhesion ×: Insufficient adhesion

(2) Residual Adhesion Rate An adhesive tape (Polyester Tape No. 31B manufactured by Nitto Denko Corporation) was attached to the surface of the substrate on which the release agent was applied.
After applying a load of 5 g / cm ² and peeling the adhesive tape from the release agent coated surface 20 hours later, affixing to a stainless steel plate, 180 ° peeling force was measured at 0.3 m / min with a tensile tester. Then, the residual adhesion rate was determined as a percentage of the peel strength of the untreated pressure-sensitive adhesive tape.

(3) Peeling force According to JIS-Z-0237, an adhesive tape (polyester tape No. 31B manufactured by Nitto Denko Corporation) is applied to the surface coated with a releasing agent.
30 minutes after application, the 180 ° peeling force was measured at 0.3 m / min with a tensile tester.

(4) Printability The printability when the ink ribbon is subjected to thermal transfer printing on the surface coated with a release agent by a printer is evaluated. <Evaluation criteria> A: The transferability of the ink during printing is clear. : The transferability of the ink during printing is slightly blurred, but clear. Δ: Ink transfer during printing is slightly blurred. ×: The transferability of the ink during printing is faint. XX: Ink is not transferred during printing.

(Evaluation Results) The above-described evaluation tests were performed on the aqueous release agents of the respective Examples and Comparative Examples. Table 1 shows the results.
Shown in

[Table 1] From the results in Table 1, it was found that the aqueous release agent of the example provided high substrate adhesion (fastness), whereas the formulation of the comparative example which did not include the fastness improver characteristic of the present invention. , Not enough in terms of robustness.

The present invention is not limited to the above embodiments and examples. Various modifications are included in the present invention without departing from the scope of the claims and within the scope of those skilled in the art.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C08K 5/20 C08K 5/20 C08L 29/04 C08L 29/04 S 101/00 101/00 F-term (reference) ) 4J002 AB022 AB032 AB052 BB082 BE021 BE031 BF022 BG012 BG062 BG132 BH022 BJ002 CC122 ED026 EP026 FD140 FD200 FD310 FD312 GH02 4J004 DA02 DA05 DB02 EA01 4J100 HA02 BA01 HA01 BA04 HA04

Claims (6)

[Claims] 1. An aqueous release agent comprising a release component, an emulsifier, and a fastness improver comprising octadecyl vinyl ether and / or ethylene bisoleic acid amide. 2. The aqueous release agent according to claim 1, wherein the amount of the fastness improver is 1 to 50 parts by weight based on 100 parts by weight of the release component. 3. The aqueous release agent according to claim 1, wherein the amount of the fastness improver is 5 to 30 parts by weight based on 100 parts by weight of the release component. 4. The peelable component has a degree of polymerization of 300 to 5
000, selected from the group consisting of isocyanate group, carboxyl group, acid halide group, ketene group, aldehyde group and epoxy group per 1 equivalent of hydroxyl group of vinyl acetate (co) polymer having a saponification degree of 50 mol% or more, A compound obtained by reacting a long-chain alkyl compound having a reactive functional group and having 6 to 30 carbon atoms in the alkyl group at a ratio of 0.5 equivalent or more in terms of the functional group. Item 1
The aqueous release agent according to any one of claims 1 to 3. 5. A polymerization degree of 300 to 5000 and a saponification degree of 50.
A functional group selected from the group consisting of an isocyanate group, a carboxyl group, an acid halide group, a ketene group, an aldehyde group, and an epoxy group, and reacting with a hydroxyl group, relative to 1 equivalent of the hydroxyl group of the vinyl acetate (co) polymer of at least mol% A release component obtained by reacting a long-chain alkyl compound having 6 to 30 carbon atoms in an alkyl group at a ratio of 0.5 equivalent or more in terms of a functional group, a surfactant, and the release component An aqueous release agent comprising 1 to 50 parts by weight of octadecyl vinyl ether per 100 parts by weight. 6. The aqueous release agent according to claim 5, wherein the amount of the octadecyl vinyl ether is 5 to 30 parts by weight based on 100 parts by weight of the release component.