JP2012201738A - Defoaming agent composition-containing thermoplastic resin aqueous dispersion, and coated article using the same - Google Patents

Abstract

An antifoamer composition aqueous dispersion using hydrophobic silica or mineral oil and a polymer emulsifier is mixed with a thermoplastic resin aqueous dispersion to improve the mixing property and to have a sufficient antifoaming effect. The purpose is to obtain.
An aqueous anti-foaming agent composition containing a cationic polymer emulsifier and containing an aqueous dispersion of a thermoplastic resin obtained by a mechanical emulsification dispersion method and at least one of hydrophobic silica and mineral oil. An antifoamer composition-containing thermoplastic resin aqueous dispersion containing an antifoamer composition aqueous dispersion dispersed with a molecular emulsifier is used.
[Selection figure] None

Description

  The present invention relates to a defoamer composition-containing thermoplastic resin aqueous dispersion and a coated product using the same.

  Conventionally, when a coating composition mainly composed of a synthetic resin emulsion is applied to paper or a film, an antifoaming agent may be added so that the coating composition does not foam. Examples of such antifoaming agents include mineral oil-based antifoaming agents and organic-based antifoaming agents. As this organic type antifoaming agent, a polyether type antifoaming agent is used, and an antifoaming agent composition (Patent Document 1) containing polyethylene glycol in the polyether antifoaming agent. An example using a compound having an alkylene group and an oxybutylene group (Patent Document 2), an example using an inorganic silicic acid fine particle and an oxyalkylene compound having 2 to 3 carbon atoms as an antifoaming agent (Patent Document 3), and the like.

  However, any of the antifoaming agents described above can suppress foaming, but when dispersibility is insufficient, fish-eye repelling may occur when applied to paper or film. If the addition amount of the antifoaming agent is reduced in order to suppress this repellency, the defoaming effect is insufficient and foaming is likely to occur during coating.

  On the other hand, in order to balance foaming and dispersibility, it is known to use a modified silicone type antifoaming agent (Patent Document 4).

  However, although the modified silicone type antifoaming agent has sufficient dispersibility, the antifoaming property tends to be insufficient. For this reason, when it is going to apply at high speed, the coating nonuniformity (striking) resulting from the entrainment of a bubble will generate | occur | produce and there exists a possibility that a coating defect may arise. Furthermore, the dispersion state of the antifoaming agent in the emulsion may deteriorate and repelling may occur.

  On the other hand, an antifoaming agent composition using hydrophobic silica or mineral oil and a polymer emulsifier as an antifoaming agent for the purpose of improving dispersibility, suppressing repelling during coating, and improving antifoaming properties. It is known to use an aqueous dispersion liquid containing benzene (Patent Document 5).

JP-A-10-216406 JP 2000-237504 A Japanese Patent Publication No. 50-1475 JP 2007-21316 A JP 2009-125613 A

  By the way, when using the aqueous dispersion of the antifoamer composition of patent document 5 for the thermoplastic resin aqueous dispersion obtained by the mechanical emulsification dispersion method, this antifoamer composition aqueous dispersion and thermoplasticity are used. Since the miscibility with the aqueous resin dispersion is insufficient, aggregation may occur or a sufficient defoaming effect may not be obtained.

  Therefore, the present invention, when an aqueous dispersion of an antifoam composition containing hydrophobic silica, mineral oil and a polymer emulsifier is mixed with an aqueous dispersion of a thermoplastic resin obtained by a mechanical emulsion dispersion method, The purpose is to improve the mixing property and to obtain a sufficient defoaming effect.

  The present invention relates to a component (A) comprising a thermoplastic resin aqueous dispersion containing a cationic polymer emulsifier obtained by a mechanical emulsion dispersion method, and an antifoaming agent containing at least one of hydrophobic silica and mineral oil The above-mentioned problem was solved by mixing the component (B) comprising an aqueous dispersion of an antifoaming agent composition in which the above was dispersed with a cationic polymer emulsifier.

  According to this invention, as the emulsifier used in the antifoam composition aqueous dispersion and the emulsifier used in the thermoplastic resin aqueous dispersion, the cationic polymer emulsifier is used, so the mixing property is improved and sufficient. A defoaming effect can be obtained.

The present invention will be described in detail below.
The defoamer composition-containing thermoplastic resin aqueous dispersion according to the present invention includes a predetermined thermoplastic resin aqueous dispersion (component (A)) and a predetermined antifoam composition aqueous dispersion (component (B)). An aqueous dispersion containing

[Antifoam composition-containing thermoplastic resin aqueous dispersion]
The defoamer composition-containing thermoplastic resin aqueous dispersion according to the present invention is an aqueous dispersion obtained by mixing the component (A) and the component (B). The mixing ratio of the component (A) and the component (B) is a solid content ratio, and the amount of the component (B) is preferably 0.01 parts by weight or more with respect to 100 parts by weight of the component (A). Part or more is more preferable. If it is less than 0.01 part by weight, the defoaming effect tends to be insufficient. On the other hand, the upper limit of the mixing ratio is preferably 1.0 part by weight, and more preferably 0.5 part by weight. When the amount is more than 1.0 part by weight, the appearance (repellency, fish eye, etc.) of the coated product such as a film obtained by applying the aqueous dispersion of the thermoplastic resin aqueous dispersion containing the antifoaming agent composition may be deteriorated.

[(A) component]
Said (A) component says the thermoplastic resin aqueous dispersion obtained by the mechanical emulsion dispersion method containing a cationic polymer emulsifier.

[Mechanical emulsification dispersion method]
Examples of the mechanical emulsification dispersion method include, for example, a method of emulsifying a thermoplastic resin in an extruder, kneading with a kneader, an ink roll, etc. in the presence of an aqueous emulsifier solution, and homogenization with a homogenizer, a disper, or the like. And how to go.

  As the above-mentioned extruder, there are single-screw and multi-screw extruders of two or more axes, but a twin-screw extruder is preferable from the viewpoint of kneading degree and speed.

  Specifically, as a method of mechanical emulsification with this extruder, first, the thermoplastic resin is charged into the extruder. The position for feeding into the extruder may be from a hopper or a vent port. Then, the cationic polymer emulsifier is introduced from another vent port, mixed and emulsified.

  80-270 degreeC is good for the cylinder temperature of the said extruder. Further, a treatment time of 20 seconds to several minutes is sufficient.

[Thermoplastic resin]
As the thermoplastic resin, a thermoplastic material having a melting point of 180 ° C. or less, a rubber material having a Vicat softening point (JISK6924-2) of 180 ° C. or less, and a softening point by Tackfire's ring and ball method (JIS K-2207) is 180 ° C. The following compounds etc. are mentioned.

  When the melting point, Vicat softening point, or softening point by Tackfire's ring-and-ball method of the above thermoplastic resin exceeds 180 ° C., the emulsion particles of the resulting aqueous dispersion are indefinite and the particle size becomes large, and the aqueous dispersion This is not preferable because the static stability of the resin tends to be poor.

  Examples of the thermoplastic material having a melting point of 180 ° C. or lower include polyethylene such as low density polyethylene, ethylene / vinyl acetate copolymer, ethylene / acrylic acid copolymer and ester thereof, or salt thereof, and ethylene / methacrylic acid copolymer. Or a crystalline ethylene copolymer mainly composed of so-called ethylene such as a salt thereof, an ethylene / methacrylic acid ester copolymer or a salt thereof, an ethylene / ethyl acrylate / maleic anhydride copolymer, an ethylene / propylene random copolymer, etc. Crystalline, propylene-based copolymers mainly composed of propylene such as propylene / hexene copolymer, propylene / butene copolymer, polyethylene wax, ester wax, carnauba wax, Fischer-Trops wax, microcrystalline wax, paraffin Wack And their oxides, low molecular weight polyamides, amide compounds such as fatty acid amides, chlorinated polyethylene, halogenated polyolefins such as chlorinated polypropylene, unsaturated carboxylic acid-modified polyolefin, and the like.

  Examples of the rubber material having a Vicat softening point of 180 ° C. or lower include polybutylene, polyisobutylene, ethylene / propylene copolymer rubber, polybutadiene and modified products thereof, and ethylene / propylene / diene terpolymer rubber.

  Compounds having a softening point of 180 ° C. or less by the Tackfire ring and ball method include terpenes and derivatives thereof, rosin and derivatives thereof, petroleum resins and derivatives thereof, low molecular weight styrene resins and derivatives thereof, and the like satisfying the above conditions May be used.

  Among these, ethylene / vinyl acetate copolymer, ethylene / acrylic acid copolymer, ethylene / ethyl acrylate / maleic anhydride copolymer, halogenated polyolefin, unsaturated carboxylic acid-modified polyolefin, carnauba wax, ester wax Since terpene derivatives and rosin derivatives have an appropriate polar group, an aqueous dispersion having particularly good stability can be obtained.

[Cationic polymer emulsifier]
The cationic polymer emulsifier refers to a polymer emulsifier having a structural unit derived from a cationic monomer, and among these, one made of a cationic (meth) acrylic copolymer is preferable. Examples of the cationic monomer constituting the cationic (meth) acrylic copolymer include alkylaminoalkyl (meth) acrylate.

  The alkyl group substituted with the alkylamino group of the alkylaminoalkyl (meth) acrylate is preferably an alkyl group having 1 to 6 carbon atoms, and specific examples include N, N-dimethylamino (meth) acrylate. Examples include ethyl, N, N-diethylaminoethyl (meth) acrylate, and N, N-dimethylamino-2-aminoethyl (meth) acrylate. These may use only 1 type and may mix and use 2 or more types.

  Examples of the cationic monomer other than the above-mentioned alkylaminoalkyl (meth) acrylate include N-aminoalkyl (meth) acrylamides such as N, N-dimethylaminoethyl (meth) acrylamide.

  As cationic polymer emulsifiers obtained from such monomers, dialkylaminoalkyl (meth) acrylate-alkyl (meth) acrylate copolymers, dialkylaminoalkyl (meth) acrylamide-alkyl (meth) acrylate copolymers Etc.

  Among these, from the viewpoint of water resistance of the film obtained from the thermoplastic resin dispersion, a neutralizing agent which is difficult to remain in the film and has been neutralized with a high vapor pressure neutralizing agent such as formic acid or acetic acid (meth) An acrylate-alkyl (meth) acrylate copolymer is more preferable as the cationic polymer emulsifier.

  The neutralizing agent is desirably used in an amount of 60 mol% to 150 mol% with respect to the functional group exhibiting cationic properties. When the amount is less than 60 mol%, the stability of the aqueous thermoplastic resin dispersion tends to deteriorate, and when the amount exceeds 150 mol%, the stability of the aqueous thermoplastic resin dispersion tends to deteriorate.

  The content of the structural unit derived from the cationic monomer in the cationic polymer emulsifier is required to be 1 mol% or more as a copolymerizable component, and preferably 2 mol% or more. When it is less than 1 mol%, the dispersion stability tends to be lowered. On the other hand, the upper limit of the content is preferably 85 mol%, and preferably 80 mol%. When it is more than 85 mol%, the dispersion stabilizing effect may be lowered.

  The copolymer constituting the polymer emulsifier is obtained by weighing each component and then polymerizing by adding each component individually to the polymerizer, or by mixing each monomer in advance. Is added to polymerize. Thereby, a copolymer can be manufactured. This copolymerization reaction is carried out in the presence of a polymerization initiator at 0 to 180 ° C., preferably 40 to 120 ° C., for 0.5 to 20 hours. This copolymerization is preferably carried out in the presence of a hydrophilic solvent such as ethanol, isopropanol or cellosolve or water.

  As the polymerization initiator, an initiator comprising a persulfate such as ammonium persulfate, potassium persulfate, sodium persulfate, etc., a redox initiator using the persulfate in combination with a sulfite, a thiosulfate reducing agent, Redox initiators using organic peroxides such as lauroyl peroxide, t-butyl hydroperoxide, cumene hydroperoxide, etc., or iron (II) salt, sulfite, thiosulfate reducing agents, etc. -Azobis (isobutyronitrile), 2,2'-azobis [2-methyl-N- (2-hydroxyethyl) propionamide], 2,2'-azobis [2- (2-imidazolin-2-yl) Propane] dihydrochloride, 2,2'-azobis (2-methylpropionamidine) dihydrochloride and other azo compounds, t-butyl Over oxy isobutyrate, 1,1-bis (t-butylperoxy) cyclohexene, t- butyl peroxybenzoate, and the like. The amount of the polymerization initiator used is preferably 0.01 to 10% by weight based on the total amount of monomers used.

  In order to improve the heat flow characteristics, it is also possible to reduce the molecular weight using a chain transfer agent or the like. In that case, in order to adjust the degree of polymerization, a known chain transfer agent such as mercaptans or lower alcohols such as methyl alcohol can be used.

  The weight average molecular weight of the obtained cationic polymer emulsifier is preferably 5000 or more, and more preferably 8000 or more. If it is less than 5000, the stability may be insufficient and a good dispersion may be difficult to obtain. On the other hand, the upper limit of the weight average molecular weight is preferably 100,000 and more preferably 60000. If it is greater than 100,000, the water solubility is lowered, and the stability of the dispersion may also be insufficient.

  The amount of the cationic polymer emulsifier used is preferably 2 to 40 parts by weight with respect to 100 parts by weight of the thermoplastic resin in terms of the stability of the resulting aqueous dispersion of the thermoplastic resin and the water resistance of the film. Preferably it is 3-20 weight part. If it is less than 2 parts by weight, the stability of the resulting aqueous thermoplastic resin dispersion may be reduced. On the other hand, if it is more than 40 parts by weight, the water resistance of the resulting film may be lowered.

[Component (B)]
The component (B) is a defoamer composition aqueous dispersion in which a specific defoamer is dispersed with a cationic polymer emulsifier.

  As the antifoaming agent, an agent containing both hydrophobic silica and mineral oil is preferably used. As the mineral oil, a hydrocarbon-based oil sold under a trade name such as so-called “mineral spirit (Idemitsu Kosan Co., Ltd.)” can be used.

  The hydrophobic silica is produced mainly by treating hydrophilic silica with a hydrophobizing agent. For example, a method of obtaining hydrophobic silica by reacting hydrophilic silica with methylchlorosilane or a silane coupling agent, a method of hydrophobizing hydrophilic silica with high molecular weight organopolysiloxane, and hexamethyldisilazane (HMDS) And a method of hydrophobizing with organopolysiloxane.

  Furthermore, an antifoaming agent in which mineral oil is blended with hydrophobic silica is also sold as a product such as “Adecanate B-940” from an additive manufacturer such as Adeka.

  The content of hydrophobic silica in the antifoam composition is preferably 1 part by weight or more per 100 parts by weight of the mineral oil, and preferably 5 parts by weight or more. When the amount is less than 1 part by weight, the defoaming effect tends to be insufficient. On the other hand, the upper limit of the mixing ratio is preferably 15 parts by weight, and preferably 10 parts by weight. When the amount is more than 15 parts by weight, there is a problem that repelling easily occurs.

  In the antifoam composition, when the antifoam composition aqueous dispersion is used, in addition to the above-described hydrophobic silica and mineral oil, a silicone-based antifoam, etc. May be added.

  As the cationic polymer emulsifier, the above-described cationic polymer emulsifier can be used.

  The addition amount (nonvolatile content) of the cationic polymer emulsifier is preferably 2 parts by weight or more per 100 parts by weight of the defoamer composition in terms of the stability of the resulting antifoam composition aqueous dispersion. 5 parts by weight or more is preferable. If the amount is less than 2 parts by weight, the stability of the aqueous antifoam composition may decrease. On the other hand, the upper limit of the addition amount is preferably 200 parts by weight, and preferably 100 parts by weight. When the amount is more than 200 parts by weight, the defoaming effect may be impaired.

  A nonionic surfactant, alcohol, etc. can be added to the antifoam composition-containing thermoplastic resin aqueous dispersion according to the present invention as long as the effects of the present invention are not impaired.

  The aqueous antifoam composition-containing thermoplastic resin dispersion according to the present invention is applied to paper, a resin film, or a metal foil, and dried to obtain a coated product. This coated product can be used as a heat-sealable sheet product.

  Examples of the resin film include a polyolefin film and a polyethylene terephthalate film, and examples of the metal foil include an aluminum foil.

  Hereinafter, the present invention will be described more specifically with reference to examples. First, the evaluation method and the raw materials used will be described.

<< Evaluation method >>
<Method for measuring polymer emulsifier>
[Neutralization degree]
The cationic polymer emulsifier is obtained by dividing the number of moles of the acidic component (acetic acid) used for neutralization by the total number of moles of the alkaline monomer component (such as N, N-dimethylaminoethyl methacrylate) in the polymer. And expressed as a percentage (%).

[Solid content]
About 1 g of the aqueous dispersion was precisely weighed and dried in a hot air circulating dryer at 105 ° C. for 3 hours, and then allowed to cool in a desiccator, and its weight was measured. And solid content was computed according to the following formula.
Solid content (% by weight) = (weight of sample after drying / weight of sample before drying) × 100

[Weight average molecular weight]
The weight average molecular weight of the polymer emulsifier was measured by gel permeation chromatography (GPC) according to the following procedure.
1) Sample preparation The sample was dried at room temperature for 24 hours, and then dried under reduced pressure at room temperature for 5 hours (using a vacuum dryer LHV-122 (manufactured by Tabay Espec)).
The obtained polymer sample was dissolved in tetrahydrofuran (THF) to obtain a 0.2 wt% solution, which was used as a measurement sample.
2) GPC measurement The measurement sample prepared as described above was measured under the following conditions using Shimadzu Corporation GPC-6A.
・ Flow rate: 1 ml / min
・ Developing solvent: THF (tetrahydrofuran)
Column: PL gel 10 μm mix B (manufactured by Polymer Laboratories)
Standard sample: monodispersed PS (manufactured by Polymer Laboratories)
Reference: Sumilizer BHT (Sumitomo Chemical Co., Ltd., molecular weight: 220)
・ Detector: RI, UV

<Measuring method of aqueous dispersion of thermoplastic resin>
[Solid content]
About 1 g of the aqueous dispersion was precisely weighed and dried in a hot air circulating dryer at 105 ° C. for 3 hours, and then allowed to cool in a desiccator, and its weight was measured. And solid content was computed according to the following formula.
Solid content (% by weight) = (weight of sample after drying / weight of sample before drying) × 100

[viscosity]
About 400 g of the aqueous dispersion was put in a 500 ml polyethylene bottle, capped, and left in a thermostatic bath at 25 ° C. for 3 hours. When the temperature reached 25 ° C., a B-type viscometer (TOKI SANGYO Co. (Manufactured, TV-10M type).

[Volume average particle diameter]
The volume average particle size was measured using a laser diffraction type particle size distribution analyzer (manufactured by Shimadzu Corporation: SALD-2100).

<Measurement method of antifoam composition>
[Compounding stability]
The obtained anti-foaming agent composition-containing mechanical emulsified dispersion is visually observed to determine whether or not aggregation is observed.
○: Aggregation is not observed.
X: Aggregation is observed.

[Repel]
The obtained defoamer composition-containing mechanical emulsified dispersion is OPP film (corona-untreated surface) (trade name: Sylphan, manufactured by Gunze Co., Ltd.) so that the coating amount is 8 g / m ² (dry) with a wire bar. (A1, thickness 50 μ, surface tension 31 dyn / cm). After coating, it is visually determined whether repelling such as fish eyes has occurred on the coated surface.
○: No repelling occurred.
×: Repelling occurred.

[Foam suppression]
100 g (solid) of the obtained antifoam composition-containing mechanical emulsion dispersion is put into a 300 g polycup (300 ml disposable cup, made of polypropylene, upper diameter × lower diameter × height φ91 mm × φ67 mm × 96 mm). Then, using the upper surface of the mechanically emulsified dispersion in the polycup as a reference surface, the height is measured.
Next, after stirring for 5 minutes at 2000 rpm with a disper stirrer, the height of the upper surface raised by foaming is measured immediately. And foam suppression property is computed by the following formula.
Foam suppression (times) = height after foaming / height of reference plane

[Defoaming]
After foaming in the foam suppression test, the time for the top surface of the aqueous thermoplastic resin dispersion to drop to the reference surface due to defoaming is measured.

<Raw materials>
<Method for Producing Cationic Polymer Emulsifier Aqueous Solution>
While stirring in a 150 L reactor equipped with a cooler, a nitrogen introducing tube, a stirrer, a monomer dropping funnel and a heating jacket, the components described in Table 1 below were charged in the amounts shown in Table 1, and after nitrogen replacement The internal temperature was raised to 80 ° C. Furthermore, the polymerization initiator (2,2′-azobisisobutyronitrile) in the amount shown in Table 1 below was added to initiate polymerization. The polymerization was continued for 4 hours while maintaining the temperature at 80 ° C. Subsequently, after neutralizing the obtained copolymer with the neutralizing agent in the amount shown in Table 1, water was added while distilling off isopropanol (IPA) to replace the viscous acrylic copolymer. A cationic polymer emulsifier (RUN1) was obtained (yield 97%).

In addition, each component used is as follows.
N, N-dimethylaminoethyl methacrylate: Sanyo Chemical Industries, Ltd., methacrylate DMA, hereinafter abbreviated as “DMA”.
Lauryl methacrylate: manufactured by Mitsubishi Rayon Co., Ltd., hereinafter abbreviated as “SLMA”.
-Butyl methacrylate: Mitsubishi Rayon Co., Ltd., hereinafter abbreviated as "BMA".
Isopropanol: manufactured by Tokuyama Corporation: Tokuso IPA (registered trademark), hereinafter abbreviated as “IPA”.

<A thermoplastic resin aqueous dispersion (component (A))>
[EM1 production method]
Ethylene-vinyl acetate copolymer (manufactured by Mitsui DuPont Co., Ltd .; trade name Evaflex 220, vinyl acetate content 28 wt%) 70 parts by weight, ethylene-methacrylic acid copolymer (manufactured by Mitsui DuPont Co., Ltd .; trade name Nucrel N1050H 100 parts by weight / hour from a hopper of a twin-screw extruder (manufactured by Ikekai Steel Corporation; model number PCM45 L / D = 30, two injection ports) Was continuously fed into the extruder at a rate of. Next, RUN1 as a polymer emulsifier is continuously supplied at 10 parts by weight / hour as a polymer emulsifier from the first inlet, and 84 parts by weight of water is supplied from the second inlet at a temperature of 100 ° C. A milky white aqueous thermoplastic resin dispersion was obtained. It adjusted by adding warm water to the obtained aqueous dispersion so that it might become the solid content concentration shown in Table 2 below. The results are shown in Table 2.

[EM2 manufacturing method]
Ethylene-vinyl acetate copolymer (manufactured by Mitsui DuPont Co., Ltd .; trade name Evaflex 220, vinyl acetate content 28 wt%) 70 parts by weight, ethylene-methacrylic acid copolymer (manufactured by Mitsui DuPont Co., Ltd .; trade name Nucrel N1050H 20 parts by weight of a methacrylic acid content of 10% by weight) and 10 parts by weight of a chlorinated polypropylene copolymer (manufactured by Toyobo Co., Ltd .; trade name HARDLENE 13LLP, chlorine content of 26% by weight) are mixed into a twin screw extruder (Ikekai It was continuously fed into the extruder at a rate of 100 parts by weight / hour from a hopper manufactured by Steel Co., Ltd .; model number PCM45 L / D = 30, two injection ports). Next, RUN1 as a polymer emulsifier is continuously supplied at 10 parts by weight / hour as a polymer emulsifier from the first inlet, and 84 parts by weight of water is supplied from the second inlet at a temperature of 100 ° C. A milky white aqueous thermoplastic resin dispersion was obtained. It adjusted by adding warm water to the obtained aqueous dispersion so that it might become the solid content concentration shown in Table 2 below. The results are shown in Table 2.

<Antifoamer composition aqueous dispersion (component (B))>
[Preparation of antifoam mixture (DF)]
Antifoaming agent mixture (DF) was prepared by mixing 20 parts by weight of hydrophobic silica, 100 parts by weight of mineral oil, 20 parts by weight of nonionic surfactant, and 80 parts by weight of ion-exchanged water.
The brands of each component are as follows.
・ Hydrophobic silica: Asahi Kasei Wacker Silicone Co., Ltd., trade name: WACKER HDK H18, hydrophobized with organopolysiloxane ・ Mineral oil: Idemitsu Kosan Co., Ltd .: Mineral Spirit Nonionic surfactant ... Polyoxyethylene alkyl (C _12-15 ) Ether, Kao Corporation, Emulgen 1118S-70 (70% by weight product)

[Preparation of antifoam composition aqueous dispersion (component (B))]
The DF was used as the defoamer mixture, the RUN1 was used as the cationic polymer emulsifier aqueous solution, and mixed at a ratio shown in Table 3 below to prepare an antifoam composition aqueous dispersion (component (B)).

(Examples 1-4, Comparative Examples 1-3)
(A) component and (B) component were mixed in the ratio shown in following Table 3, and the antifoamer composition containing thermoplastic resin aqueous dispersion was adjusted.
Each physical property was measured using the obtained antifoam composition-containing thermoplastic resin aqueous dispersion. The results are shown in Table 3.

(Comparative Example 4)
As an emulsifier used in the aqueous defoamer composition dispersion, a product using Kuraray Co., Ltd .: PVA205 (degree of saponification: about 87.0-89.0 mol%, degree of polymerization: 500) instead of RUN1 above. The antifoam composition-containing thermoplastic resin aqueous dispersion was prepared by mixing and mixing this and the component (A) in the proportions shown in Table 3 below.
Each physical property was measured using the obtained antifoam composition-containing thermoplastic resin aqueous dispersion. The results are shown in Table 3.

(Comparative Example 5)
As an emulsifier to be used in the antifoam composition aqueous dispersion, a commercially available cationic emulsifier, Anstex C-200, was used instead of RUN1, and this and the component (A) are shown in Table 3 below. The mixture was mixed at a ratio shown in the following to prepare an aqueous antifoam composition-containing thermoplastic resin dispersion. Using this, each physical property described above was measured. The results are shown in Table 3.
Anstex C-200 (trade name) is manufactured by Toho Chemical Industry Co., Ltd .: polyoxyethylene trialkylammonium nitrate, 50% polyoxyethylene trialkylammonium nitrate, 20-25% isopropyl alcohol and water ( The remainder).

Claims (3)

An antifoam composition-containing thermoplastic resin aqueous dispersion containing the following components (A) and (B):
(A) An aqueous thermoplastic resin dispersion containing a cationic polymer emulsifier and obtained by a mechanical emulsion dispersion method.
(B) A defoamer composition aqueous dispersion in which a defoamer composition containing at least one of hydrophobic silica and mineral oil is dispersed with a cationic polymer emulsifier.   The antifoam composition-containing thermoplastic resin aqueous solution according to claim 1, wherein the cationic polymer emulsifier used for the component (B) is a cationic (meth) acrylic copolymer having a weight average molecular weight of 5,000 to 100,000. Dispersion.   A coated product obtained by applying and drying the antifoam composition-containing thermoplastic resin aqueous dispersion according to claim 1 or 2 on paper or a resin film.