JP2001302963A - Aqueous emulsion composition for forming degradable film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an aqueous emulsion composition for forming a degradable film which has an excellent degradability and may be used for forming a smooth metallic film having a phase separation structure by the addition of a water-soluble polymer. SOLUTION: The aqueous emulsion composition for forming a degradable film comprises a polymer particle (b), obtained by copolymerizing an alkyl methacrylate (i) having a 1-4C alkyl group, a polymerizable monomer (ii) having a hydroxyl group and, if required, other copolymerizable monomers (iii) in the presence of a nonionic surfactant or the combination of a nonionic surfactant and an ionic surfactant (a), and (c) water.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to an aqueous emulsion composition for forming a degradable film. More specifically, the present invention relates to an aqueous emulsion composition for forming a decomposable film, which has excellent decomposability and can be used for forming a smooth metal film having a phase separation structure by adding a water-soluble polymer.

[0002]

2. Description of the Related Art When depositing metal on an uneven substrate surface, in order to flatten or temporarily protect the substrate surface,
A method of forming an organic film has been used. Forming a coating film by applying and drying a solution of a polymer compound on the surface of the base material, and then depositing a metal film on the organic film, and then treating at a temperature higher than the thermal decomposition temperature of the organic film. Thus, the organic film is incinerated, and a metal film having a smooth surface is obtained.

[0003] Such a technique is disclosed, for example, in US Pat.
As described in JP-A-17,337, JP-A-50-120658, etc., it is used for vapor deposition of a metal film on a phosphor layer in the production of a cathode ray tube, and usually an aqueous acrylic emulsion is used. .

Also, a method has been proposed in which a water-soluble polymer is added to a water-based acrylic emulsion in order to prevent blistering of the metal film due to a decomposition gas such as an acrylic resin when the organic film is incinerated after the metal film is deposited. (JP-A-58-35834). Addition of a small amount of a water-soluble polymer, which is incompatible with the main component acrylic resin, causes phase separation in the formed coating film and creates a gap in the metal deposition film. To escape and prevent blistering of the metal film.

In order to improve the decomposability, an acrylic emulsion or the like obtained by copolymerizing n-butyl methacrylate having a better thermal decomposability is used for forming a decomposable film. In the case of applying by adding, a uniform metal film can not be uniformly applied to the surface of the base material, resulting in uneven coating, or a sufficient phase separation structure does not occur and the metal film is easily blistered. It was difficult.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to provide an aqueous emulsion for forming a decomposable film which has low-temperature decomposability and has excellent flatness without metal film swelling during incineration. It provides a composition.

[0007]

Means for Solving the Problems The present invention relates to the following inventions. 1. In the presence of a nonionic surfactant or a nonionic surfactant and an ionic surfactant (a), the number of carbon atoms is 1 to 4;
Alkyl methacrylate having an alkyl group (i)
And polymer particles (b) obtained by copolymerizing a polymerizable monomer (ii) having a hydroxyl group with another copolymerizable monomer (iii) if necessary, and (c) water. An aqueous emulsion composition for forming a decomposable film, comprising the first invention. 2. In the first invention, the content of the alkyl methacrylate (i) having an alkyl group having 1 to 4 carbon atoms is 75 to 99% by weight based on the total weight of the monomers constituting the polymer particles.
Wherein the content of the polymerizable monomer (ii) having a hydroxyl group is 1 to 1 with respect to the total weight of the monomers constituting the polymer particles.
5% by weight and other copolymerizable monomers (iii)
The aqueous emulsion composition for forming a decomposable film according to claim 1, wherein the content of is from 0 to 24% by weight based on the total weight of the monomers constituting the polymer particles (second invention). 3. The aqueous emulsion composition for forming a decomposable film according to the first or second invention, wherein the aqueous emulsion has a surface tension of 40 mN / m or less at 22 ° C. (third invention). 4. The water-based emulsion composition for forming a degradable film according to any one of the first to third inventions (fourth invention). 5. The polymer film according to any one of the first to fourth inventions, wherein the polymer particles are incompatible with the water-soluble polymer, and the water-soluble polymer is added to the aqueous emulsion to form a dry film having a microphase-separated structure. Water-based emulsion composition (fifth invention).

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Among the constituent components of the polymer particles contained in the aqueous emulsion composition for forming a degradable film of the present invention, the component (i) is one which improves the sinterability of the degradable film. It is.

[0009] Examples of the component (i) include those having 1 to 1 carbon atoms.
The alkyl methacrylate having an alkyl group of 4 is not particularly limited. For example, methyl methacrylate,
Ethyl methacrylate, n-butyl methacrylate, i
-Butyl methacrylate, sec-butyl methacrylate and the like, and preferably n-butyl methacrylate. These may be used alone or in combination of two or more.

[0010] The content of the component (i) is preferably from 75 to 99% by weight, more preferably from 80 to 95% by weight, based on the total weight of the monomers constituting the polymer particles.
When the content of the component (i) is less than 75% by weight, the decomposability of the organic film tends to be inferior. When the content is more than 99% by weight, the hydrophobicity of the polymer particles is high, and the emulsion liquid is uniform on the substrate surface. Tend not to be applied.

The component (ii) of the polymer particles dispersed in the aqueous emulsion composition for forming a degradable film of the present invention comprises:
The compound is not particularly limited as long as it is a compound that provides hydrophilicity to the polymer particles and forms a uniform film, and has a hydroxy group and one ethylenically unsaturated group in the molecule. (Ii) As a specific example of the component, 2-
Hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, hydroxycyclohexyl (meth) acrylate, polyethylene glycol mono (meth) acrylate, caprolactone-modified hydroxy (meth) acrylate, and the like. Can be These polymerizable monomers having a hydroxyl group are used alone or in combination of two or more. The content of the component (ii) is preferably from 1.0 to 15% by weight, more preferably from 2.0 to 15% by weight, based on the total weight of the monomers constituting the polymer particles.
It is not more than 10.0% by weight. (Ii) The content of the component is 1.
When the amount is less than 0% by weight, the polymer particles have a strong hydrophobicity, and the emulsion cannot be uniformly applied to the surface of the base material.
If it exceeds 0% by weight, the degradability of the organic film tends to be poor.

(Iii) Other copolymerizable monomers are components for adjusting the glass transition temperature and the minimum film forming temperature (MFT) of the emulsion composition of the present invention. (Iii) Specific examples of the component include (i) and (ii)
Other than the components, methacrylic acid esters, acrylic acid esters, styrene, substituted styrenes, vinyl chloride, acrylonitrile, acrylamide, etc. These may be used alone or in combination of two or more.
The content of the component (iii) is set depending on the glass transition temperature and MFT of the obtained emulsion, and is preferably 24% by weight or less based on the total weight of the monomers constituting the polymer particles, more preferably Is 15% by weight or less. When the content of the component (iii) exceeds 24% by weight, the decomposability of the organic film tends to be poor.

In order to obtain an emulsion polymer composition having good dispersion stability as a component other than these, it is generally preferable to include a carboxylic acid group-containing monomer in the composition. Specific examples of the carboxylic acid group-containing polymerizable monomer include acrylic acid, methacrylic acid, itaconic acid, crotonic acid, maleic acid, at least one unsaturated carboxylic acid selected from maleic anhydride, and the like. Methacrylic acid is preferred. However, these carboxylic acid group-containing monomer components are preferably in a range of 2.0% by weight or less, more preferably 1.0% by weight or less of the total weight of the monomers constituting the polymer particles. Used for If these components exceed 2.0% by weight, the sinterability of the film will be poor.

The calculation of the glass transition temperature of the copolymer is described in TG Fox, Bull. Am. Phys. Soc., 1,123.
(1956). The minimum film formation temperature is (MFT)
Metal plate with continuous temperature gradient (YOSHIMITS
(Available from USEIKI Co., Ltd.) and then drying to obtain a minimum film-forming temperature at which a uniform film without cracks is formed.

In the present invention, a nonionic surfactant or a nonionic surfactant and an ionic surfactant are used as the surfactant (a). Examples of the nonionic surfactant include, for example, polyoxyethylene alkyl ether, polyoxyethylene dialkylphenyl ether, polyoxyethylene carboxylate, and a block copolymer of polyoxyethylene polyoxypropylene, but are particularly limited. Not something. These may be used alone or in combination of two or more. The calculated HLB of the nonionic surfactant is preferably 16.
0 or more, more preferably 17.0 or more. If the calculated HLB of the nonionic surfactant is 16.0 or less, phase separation of the emulsion film due to the addition of the water-soluble polymer is difficult to form, and the metal film tends to bulge. The amount of the nonionic surfactant is preferably 0.02% by weight or more based on all monomers. If the amount used is less than 0.02% by weight, the phase separation effect of the emulsion film due to the addition of the water-soluble polymer is insufficient, and the metal film tends to bulge. Examples of the ionic surfactant include, for example, anionic surfactants such as alkyl sulfates, alkyl allyl sulfates, alkyl sulfonates, alkyl allyl sulfonates, and dialkyl sulfosuccinates. Ammonium chloride, cationic surfactants such as alkylbenzylammonium chloride, lauryl betaine,
An amphoteric surfactant such as cocamidopropyl betaine may be mentioned, but an anionic surfactant is preferred from the viewpoint of emulsion polymerization. These ionic surfactants are used alone or in combination of two or more. The amount of the ionic surfactant used depends on the type of the surfactant used, but is preferably 0.0
It is in the range of 1 to 10% by weight, more preferably in the range of 0.1 to 5% by weight. If the amount is small, the stability during polymerization and storage is poor. If the amount is too large, the organic film is poorly degraded by the surfactant and tends to be left behind.

An aqueous acrylic emulsion composition obtained by using a nonionic surfactant and an anionic surfactant in combination has a low surface tension and a surface tension of 40 mN / m (2
2 ° C.) or less is preferred. Surface tension of 40 mN / m (2
If the temperature exceeds 2 ° C.), when the aqueous acrylic emulsion composition is applied to the surface of a base material, repelling tends to occur or the applicability tends to be poor. The surface tension of the emulsion composition was measured using a surface tension measuring device BYK Gardner Dy.
It is measured using a nomerter (manufactured by BYK Japan KK). The measurement is performed by first measuring the surface tension of the emulsion composition at 22 ° C. using purified water (manufactured by Wako Pure Chemical Industries, Ltd.) as a standard substance and calibrating the equipment, and then measuring the surface tension of the emulsion composition.

For the synthesis of the aqueous acrylic emulsion composition, various known methods can be used. Once a water-soluble solvent, for example, alcohols such as isopropanol and butanol, and solvents such as ethyl cellosolve and cellosolves such as butyl cellosolve, are subjected to solution polymerization and then dispersed in water to form an emulsion. A method in which a monomer alone or a mixture is emulsified in the presence of an activator and polymerized by heating, that is, a so-called emulsion polymerization method is simple and preferred. In the emulsion polymerization, a surfactant and water, or, if necessary, a part of a polymerizable unsaturated monomer and a polymerization initiator are charged into a reactor, and the polymerizable unsaturated monomer (and, if necessary, A polymerization method (monomer addition method) in which a polymerization initiator and a surfactant are also added later as the polymerization proceeds, or
An emulsion polymerization method such as a polymerization method (emulsion addition method) in which a part of the polymerizable unsaturated monomer is first emulsified and polymerized, and the other is emulsified and sequentially added as an emulsion during the polymerization (emulsion addition method).

As the polymerization initiator, a peroxide or an azo compound which generates radicals by thermal decomposition is used.
Representative polymerization initiators are potassium persulfate, ammonium persulfate, sodium perchlorate, ammonium perchlorate, hydrogen peroxide, t-butylhydroxide,
Water-soluble polymerization initiators such as azobisaminodipropane hydrochloride, oil-soluble such as benzoyl peroxide, cumene hydroperoxide, dibutyl peroxide, diisopropylperoxydicarbonate, cumylperoxyoctoate, and azobisusubutyronitrile And a polymerization initiator. Further, a so-called redox system can be used by using a reducing agent such as sodium acid sulfite, sodium hydroxymethanesulfinate, and ascorbic acid in combination. The amount of the polymerization initiator used is determined depending on the type of the initiator to be used and the characteristics of the emulsion to be obtained.
% By weight.

In the emulsion polymerization, except for the above-mentioned raw materials,
, An amine compound, an aqueous ammonium solution, and a chain transfer agent for adjusting the molecular weight can be used. Known additives such as a thickener for adjusting the resin viscosity, a rheology control agent for adjusting the thixotropy, a film-forming aid for improving the film-forming property, and a plasticizer can also be used.

In the present invention, the finally obtained acrylic emulsion composition preferably has a solid content of 35 to 45% by weight and water of 55 to 65% by weight in terms of adjusting a coating solution when used. In addition, solid content is a heating residue of the acrylic emulsion composition at 108 ° C. for 3 hours. The viscosity of the acrylic emulsion composition was measured using a BL-type viscometer at 25 ° C. and 60 rpm.

The average particle size of the polymer particles is from 0.05 to
1.0 μm, preferably 0.08 to 0.5 μm
m is more preferable. Average particle size 0.05μ
When it is less than m, the viscosity of the obtained emulsion becomes too high and is not practical, while when it exceeds 1.0 μm, the stability of the emulsion tends to be inferior. The average particle size can be measured using a COULTER N4 type submicron particle size analyzer (manufactured by Nikkaki Co., Ltd.). Further, the pH of the acrylic emulsion composition is preferably 4 or less, more preferably 2.5 or less. The pH of the acrylic emulsion composition was measured using a pH meter (M
model PH82, manufactured by Yokogawa Electric Corporation).

In the present invention, by using a water-soluble polymer, a microphase-separated structure is formed in the coating film, and a gap is formed in the deposited metal film. When the organic coating film is incinerated, the decomposition gas is released from the gap, so that the metal film can be prevented from bulging. Examples of the water-soluble polymer include polyvinyl alcohol, polyvinylpyrrolidone, polyacrylate, cellulose derivative, polystyrene-maleate, and the like, but are preferably incompatible with the polymer particles. The amount of the water-soluble polymer is 0.1 to 5.0% by weight based on the acrylic emulsion composition.
Is preferred. When the addition amount is less than 0.1% by weight, the phase separation effect of the emulsion film due to the addition of the water-soluble polymer is insufficient, and the metal film tends to bulge.
On the other hand, when the addition amount exceeds 5.0% by weight, the decomposability of the organic film is insufficient, and there is a tendency that after-burning occurs. The aqueous emulsion composition according to the present invention is used after being diluted with water depending on the use conditions (coating method, use temperature), but the amount of dilution of water is not particularly limited.

[0023]

Next, the present invention will be described more specifically with reference to examples, but the present invention is not limited to these examples. In addition, "part" means "part by weight".

Synthesis of Aqueous Acrylic Emulsion Composition Example 1 In a reactor equipped with a stirrer, a reduction condenser, a thermometer and a nitrogen gas injection tube, an anionic surfactant monogen Y-100 (a higher alcohol sodium sulfate) was added. Salt, manufactured by Daiichi Kogyo Seiyaku Co., Ltd.) 20.0 parts, 291M (70% by weight of diacrylsulfone succinate active ingredient, manufactured by Nippon Emulsifier Co.) 11.4 parts, nonionic surfactant Newc
ol 506 (polyoxyethylene nonylphenyl ether, HLB17.1, manufactured by Nippon Emulsifier Co.) 16.0 parts,
After 1240.0 parts of ion-exchanged water was charged and heated to 70 ° C., the atmosphere was replaced with nitrogen. Then, out of 800 parts of a monomer mixture liquid composed of 689.6 parts of n-butyl methacrylate, 24.0 parts of 2-hydroxyethyl acrylate, 78.4 of methyl methacrylate, and 8.0 parts of methacrylic acid,
80 parts (10% by weight of the total monomer mixture) were charged and sufficiently stirred. An aqueous solution of a polymerization initiator consisting of 2.4 parts of ammonium persulfate and 16.0 parts of ion-exchanged water was added, and 15
Allowed to react for minutes. After the heat generation of the reaction solution had subsided, the remaining monomer mixture was dropped uniformly over 3 hours while maintaining the temperature in the polymerization reactor at 70 ° C. After the completion of the dropwise addition, the temperature in the reactor was raised to 80 ° C., and the reaction was further performed by keeping the temperature at 80 ° C. for 3 hours. After the completion of the reaction, the resultant was cooled and filtered to obtain an aqueous acrylic emulsion composition. The solid content of this aqueous acrylic emulsion composition was 38.2% by weight, the minimum film-forming temperature was 39 ° C., the viscosity was 20.5 mPa · s, the pH was 2.1, and the average particle diameter was 0.08 μm (solid The measurement of the amount and the like was performed by the method described in the detailed description of the invention.

Synthesis Example 2 of Aqueous Acrylic Emulsion Composition: Nonionic surfactant Newcol 506 was changed to Newcol 504 (polyoxyethylene nonylphenyl ether, HLB 16.0, manufactured by Nippon Emulsifier Co.), and Synthesis Example 1 It was synthesized in the same manner as described above. The solid content of the obtained water-based acrylic emulsion composition is 3
9.0% by weight, minimum film forming temperature 39 ° C., viscosity 19.2
mPa · s, pH 2.1, average particle size 0.08 μm
Met.

Synthesis of Aqueous Acrylic Emulsion Composition Example 3: Mixing monomer mixture with n-butyl methacrylate 6
64.0 parts, 2-hydroxyethyl acrylate
0 part, 88.0 parts of methyl methacrylate, and 8.0 parts of methacrylic acid, and synthesized in the same manner as in Synthesis Example 1. The obtained aqueous acrylic emulsion composition has a solid content of 38.5% by weight, a minimum film-forming temperature of 39 ° C., and a viscosity of 2%.
2.5 mPa · s, pH 2.1, average particle size 0.0
It was 8 μm.

Synthesis of Water-Based Acrylic Emulsion Composition Example 4: The amount of surfactant used was
0.0 parts, 291M, 22.9 parts, Newcol 50
6, 16.0 parts, and the polymerizable monomer having a hydroxyl group, 2-hydroxyethyl acrylate, was changed to 4-hydroxybutyl methacrylate, and was synthesized in the same manner as in Synthesis Example 1. The obtained aqueous acrylic emulsion composition has a solid content of 38.7% by weight, a minimum film-forming temperature of 40 ° C., a viscosity of 39.2 mPa · s, and a pH of 2.
2. The average particle size was 0.08 μm.

Synthesis of Water-Based Acrylic Emulsion Composition Example 5: The amount of surfactant used was
0.0 parts, 291M, 34.3, Newcol 50
6, 16.0 parts, and the polymerizable monomer 2-hydroxyethyl acrylate having a hydroxyl group was changed to hydroxycyclohexyl methacrylate, and the synthesis was carried out in the same manner as in Synthesis Example 1. The obtained aqueous acrylic emulsion composition had a solid content of 38.8% by weight, a minimum film-forming temperature of 40 ° C., a viscosity of 39.0 mPa · s, a pH of 2.1, and an average particle size of 0.08 μm. .

Synthesis of Aqueous Acrylic Emulsion Composition Example 6: The amount of surfactant used was
0.0 parts, 291M, 22.9 parts, Newcol 50
6, 16.0 parts, and the polymerizable monomer having a hydroxyl group, 2-hydroxyethyl acrylate, was changed to 4-hydroxybutyl methacrylate, and was synthesized in the same manner as in Synthesis Example 1. The obtained aqueous acrylic emulsion composition had a solid content of 39.0% by weight, a minimum film-forming temperature of 40 ° C., a viscosity of 31.3 mPa · s, and a pH of 2.
2. The average particle size was 0.08 μm.

Synthesis of Aqueous Acrylic Emulsion Composition Comparative Example 1: n-butyl methacrylate 7
32.8 parts, 59.2 parts of methyl methacrylate, and 8.0 parts of methacrylic acid were used, and synthesis was performed in the same manner as in Synthesis Example 1. The obtained aqueous acrylic emulsion composition has a solid content of 38.4% by weight and a minimum film-forming temperature of 40%.
C., viscosity was 64.7 mPa · s, pH was 2.2, and average particle size was 0.09 μm.

Synthesis of Water-Based Acrylic Emulsion Composition Comparative Example 2: n-butyl methacrylate 7
The synthesis was carried out in the same manner as in Synthesis Example 1 except that 32.8 parts, 43.2 parts of methyl methacrylate, and 24.0 parts of methacrylic acid were used. The obtained water-based acrylic emulsion composition has a solid content of 39.2% by weight and a minimum film-forming temperature of 40%.
° C, viscosity was 25.6 mPa · s, pH was 2.4, and average particle size was 0.09 µm.

Synthesis of Water-Based Acrylic Emulsion Composition Comparative Example 3: n-butyl methacrylate 3
The synthesis was performed in the same manner as in Synthesis Example 1 except that 28.0 parts, 256.0 parts of methyl methacrylate, 172.5 parts of ethyl acrylate, and 44.0 parts of methacrylic acid were used. The obtained aqueous acrylic emulsion composition has a solid content of 39.1% by weight, a minimum film-forming temperature of 40 ° C., and a viscosity of 1%.
5.1 mPa · s, pH 2.4, average particle size 0.0
It was 9 μm.

Measurement of the thermal decomposition temperature of the acrylic resin: The dried resin powder of the acrylic emulsion composition was subjected to thermal analysis using a thermal analyzer (TG / DTA200, Seiko Instrument).
mentes Inc. Under air atmosphere (100 ml / min) or nitrogen atmosphere (100 ml / min).
Min), the temperature was raised to 550 ° C. at a rate of 10 ° C./min, the change in weight was measured, and the temperature at which the weight became half of the initial weight was defined as the thermal decomposition temperature. Table 1 shows the results.

Preparation of the aqueous emulsion coating solution for forming the degradable film: The aqueous acrylic emulsion composition was diluted with ion-exchanged water to a resin solid content of about 12% by weight as described below, and then hydroxyethyl cellulose was added to the total aqueous acrylic emulsion. An aqueous emulsion coating solution for forming a degradable film was prepared by adding 0.5% by weight to the diluting solution. Acrylic emulsion (solid content 39% by weight) 100 parts Hydroxyethyl cellulose Note) (7.5% by weight aqueous solution) 20 parts Ion-exchanged water 200 parts Note) Viscosity 200 to 300 cps (2% by weight aqueous solution, 20 parts) manufactured by Tokyo Chemical Industry Co., Ltd. ℃)

Evaluation of coatability of water-based emulsion coating liquid for forming degradable coating and observation of coating film structure:
It was applied to a glass plate preheated to 0 ° C. by an applicator and heated at 40 ° C. to form a film. The film formability was visually evaluated, and the structure of the coating film was observed with an electron microscope.
Table 1 shows the results.

[0036]

[Table 1]

[0037]

Industrial Applicability The present invention provides an aqueous emulsion composition for forming a decomposable film having excellent decomposability and having a phase-separated structure by adding a water-soluble polymer, and is useful for forming a metal-deposited film having a smooth surface. It is.

Continued on the front page F-term (reference) 4J038 CG141 GA03 GA06 GA09 GA10 GA12 JA27 JA28 JA55 JB11 JC14 KA09 LA04 MA08 MA10 NA01 NA13 PB07 PC02 4J100 AB02R AB07R AC03R AJ02R AJ08R AJ09R AL03P AL03R AL04RAL08Q08 BA09 JA01

Claims (5)

[Claims] 1. An alkyl methacrylate (i) having an alkyl group having 1 to 4 carbon atoms and a hydroxyl group in the presence of a nonionic surfactant or a nonionic surfactant and an ionic surfactant (a). Polymer particles (b) obtained by copolymerizing the polymerizable monomer (ii) and, if necessary, other copolymerizable monomer (iii), and (c) a decomposable composition containing water. An aqueous emulsion composition for forming a film. 2. The content of the alkyl methacrylate (i) having an alkyl group having 1 to 4 carbon atoms is 75 to 99% by weight based on the total weight of monomers constituting the polymer particles.
The content of the polymer monomer (ii) having a hydroxyl group is 1 to 15% by weight based on the total weight of the monomers constituting the polymer particles, and the other copolymerizable monomer (iii) The aqueous emulsion composition for forming a decomposable film according to claim 1, wherein the content of is from 0 to 24% by weight based on the total weight of the monomers constituting the polymer particles. 3. The aqueous emulsion liquid has a surface tension of 22.
The aqueous emulsion composition for forming a decomposable film according to claim 1 or 2, wherein the aqueous emulsion composition has a viscosity of 40 mN / m or less at ℃. 4. The composition according to claim 1, which contains a water-soluble polymer.
The aqueous emulsion composition for forming a degradable film according to any one of the above. 5. The film according to claim 1, wherein the polymer particles are incompatible with the water-soluble polymer, and the membrane obtained by adding the water-soluble polymer to the aqueous emulsion has a microphase-separated structure. Aqueous emulsion composition for forming a decomposable film.