JP2003268185A - Aqueous emulsion composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an aqueous emulsion composition which is excellent in water resistance and solvent resistance, and particularly excellent in storage stability at high temperatures. SOLUTION: A vinyl alcohol polymer having 1 to 20 mol% of α-olefin units having 4 or less carbon atoms in the molecule and having a saponification degree of 90 mol% or more is used as a dispersant, and a vinyl of fatty acid having 4 or less carbon atoms is used as a dispersant. 0.1 to 10 parts by weight of a carboxyl group-containing ethylenically unsaturated monomer unit and 0.1 to 15 vinyl ester monomer units of a fatty acid having 5 or more carbon atoms per 100 parts by weight of the ester monomer unit. An aqueous emulsion composition comprising an aqueous emulsion (A) containing a polymer containing parts by weight as a dispersoid and an aluminum compound (B) and having a pH of 2 to 5.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an aqueous emulsion composition, and more particularly to an aqueous emulsion composition having excellent water resistance and solvent resistance, and particularly excellent storage stability at high temperatures.

[0002]

2. Description of the Related Art Conventionally, polyvinyl alcohol (hereinafter referred to as P
VA may be abbreviated) is widely used as a protective colloid for emulsion polymerization of ethylenically unsaturated monomers, particularly vinyl ester-based monomers typified by vinyl acetate. Aqueous vinyl ester emulsions obtained by emulsion polymerization are various adhesives for paper, woodworking and plastics, various binders for impregnated paper and non-woven products, admixtures, jointing materials, paints, papers, etc. Widely used in fields such as processing and textile processing. By adjusting the saponification degree of the PVA-based polymer, such an aqueous emulsion generally has a low viscosity, exhibits a viscosity close to Newtonian flow, and has relatively good water resistance. It has been used for various purposes because it has various properties such as high viscosity and relatively low temperature dependence of emulsion viscosity. However, some of the aqueous emulsions have drawbacks such as lack of fluidity (high-speed coating property), poor water resistance, large temperature dependence of emulsion viscosity, and remarkable increase in emulsion viscosity at low temperature. have. In order to improve this drawback, a vinyl alcohol polymer containing an ethylene unit has been proposed, and the water resistance and the stability at low temperature storage have been greatly improved.

However, these conventional vinyl ester polymers may not have sufficient water resistance in some cases, and in JP 2001-72820 A, ethylene-modified P is used.
VA as a dispersant, vinyl acetate monomer unit and (meth)
An aqueous emulsion composition has been proposed in which an aluminum compound is mixed with an aqueous emulsion having a polymer composed of a monomer unit containing a carboxyl group such as acrylic acid as a dispersoid. However, it has become clear that the proposed emulsion composition still has a problem in stability, especially when left at a high temperature of 60 ° C.

[0004]

Under these circumstances, the present invention provides an aqueous emulsion composition which is excellent in water resistance and solvent resistance, and particularly excellent in storage stability at high temperatures. The purpose is.

[0005]

Means for Solving the Problems As a result of intensive studies to develop an aqueous emulsion composition having the above-mentioned preferable properties, the present inventors have found that α- having 4 or less carbon atoms in the molecule.
Containing 1 to 20 mol% of olefin units, saponification degree of 90
Using a vinyl alcohol-based polymer at a mol% or more as a dispersant,
Vinyl ester monomer unit 1 of fatty acid having 4 or less carbon atoms
100 parts by weight of a carboxyl group-containing ethylenically unsaturated monomer unit 0.1 to 10 parts by weight and a vinyl ester-based monomer unit of a fatty acid having 5 or more carbon atoms 0.1 to 15 parts by weight. It is composed of an aqueous emulsion (A) and a aluminum compound (B) which have a coalesced dispersoid.
It was found that an aqueous emulsion composition having a ratio of 2 to 5 satisfies the purpose, and completed the present invention.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION In the molecule used as a dispersant for the aqueous emulsion (A) used in the aqueous emulsion composition of the present invention, 1 to 1 α-olefin unit having 4 or less carbon atoms is contained.
The vinyl alcohol polymer containing 20 mol% and having a saponification degree of 90 mol% or more can be obtained by saponifying a copolymer of a vinyl ester and an α-olefin having 4 or less carbon atoms. Examples of the α-olefin unit having 4 or less carbon atoms include ethylene, propylene, butylene and isobutylene units, with ethylene units being preferred.

Examples of the vinyl ester include vinyl formate, vinyl acetate, vinyl propionate, vinyl pivalate and the like, and vinyl acetate is preferable from the economical point of view.

The content of the α-olefin unit having 4 or less carbon atoms is required to be 1 to 20 mol%,
It is preferably 2 to 15%, more preferably 3 to 10%. The content of α-olefin unit having 4 or less carbon atoms is 1
If it is less than mol%, an aqueous emulsion satisfying simultaneously solvent resistance, water resistance and shelf stability cannot be obtained, and 2
When it exceeds 0 mol%, the water solubility is lowered and there is a concern that a stable aqueous emulsion cannot be obtained.

Further, the molecule used for the dispersant contains 1 to 20 mol% of an α-olefin unit having 4 or less carbon atoms,
The vinyl alcohol-based polymer having a saponification degree of 90 mol% or more may be a copolymer of an ethylenically unsaturated monomer copolymerizable within a range not impairing the effects of the present invention. Examples of such an ethylenically unsaturated monomer include acrylic acid, methacrylic acid, fumaric acid, (anhydrous) maleic acid,
Itaconic acid, acrylonitrile, methacrylonitrile,
Acrylamide, methacrylamide, trimethyl- (3
-Acrylamido-3-dimethylpropyl) -ammonium chloride, acrylamido-2-methylpropanesulfonic acid and its sodium salt, ethyl vinyl ether, butyl vinyl ether, N-vinyl pyrrolidone, vinyl chloride, vinyl bromide, vinyl fluoride, vinylidene chloride, Examples thereof include vinylidene fluoride, tetrafluoroethylene, sodium vinyl sulfonate and sodium allyl sulfonate. Further, in the presence of a thiol compound such as thiol acetic acid or mercaptopropionic acid, a vinyl ester-based monomer such as vinyl acetate is mixed with a C 4 or less α
A terminal modified product obtained by copolymerizing with an olefin and saponifying the obtained copolymer can also be used.

In the present invention, 1 to 20 α-olefin units are contained in the molecule used as a dispersant for an aqueous emulsion.
The saponification degree of the vinyl alcohol-based polymer containing 90 mol% or more of saponification degree is required to be 90 mol% or more, more preferably 92 mol% or more, and further preferably 93 mol% or more. is there. When the saponification degree is less than 90 mol%, an aqueous emulsion composition having excellent solvent resistance and water resistance cannot be obtained. The degree of polymerization of the vinyl alcohol-based polymer is preferably in the range of 100 to 8,000, and more preferably 300 to 3 in order to more suitably achieve the object of the present invention.
000 is more preferable.

The number of carbon atoms constituting the dispersoid in the aqueous emulsion constituting the aqueous emulsion composition of the present invention is 4
Examples of vinyl ester-based monomers of the following fatty acids include vinyl esters such as vinyl formate, vinyl acetate and vinyl propionate, with vinyl acetate being preferably used.

Further, in the present invention, it is essential that the dispersion of the aqueous emulsion (A) is a polymer having a carboxyl group-containing ethylenically unsaturated monomer unit. The carboxyl group-containing ethylenically unsaturated monomer is not particularly limited, and examples thereof include acrylic acid, methacrylic acid, itaconic acid, maleic anhydride, and the like, and acrylic acid and methacrylic acid are particularly preferably used.

It is important to use the carboxyl group-containing ethylenically unsaturated monomer in an amount of 0.1 to 10 parts by weight, preferably 100 parts by weight of a vinyl ester monomer of a fatty acid having 4 or less carbon atoms. 0.2 to 7 parts by weight, more preferably 0.25 to 5 parts by weight. When the use ratio of the carboxyl group-containing ethylenically unsaturated monomer is less than 0.1 part by weight, the water resistance of the obtained aqueous emulsion composition is insufficient, and when it exceeds 10 parts by weight, the aqueous emulsion composition is heated at a high temperature. The storage stability in storage may decrease.

In the present invention, the dispersoid of the aqueous emulsion (A) is obtained by copolymerizing, in addition to the carboxyl group-containing ethylenically unsaturated monomer, a vinyl ester monomer of a fatty acid having 5 or more carbon atoms. It is essential that the polymer be It is important to use 0.1 to 15 parts by weight of the vinyl ester-based monomer of a fatty acid having 5 or more carbon atoms, relative to 100 parts by weight of a vinyl ester-based monomer of a fatty acid having 4 or less carbon atoms. Is 0.2 to 10 parts by weight, more preferably 0.25 to 7 parts by weight. When the vinyl ester monomer of a fatty acid having 5 or more carbon atoms is less than 0.1 part by weight, the storage stability of the aqueous emulsion composition at high temperature is insufficient, and when it exceeds 15 parts by weight, the water resistance is lowered. There is. Here, the vinyl ester-based monomer of a fatty acid having 5 or more carbon atoms means a vinyl ester-based monomer of a linear or branched fatty acid having 5 or more carbon atoms in the fatty acid. Examples of the vinyl ester-based monomer of linear fatty acid include lauric acid vinyl ester and stearic acid vinyl ester. Examples of vinyl esters of branched fatty acids include vinyl esters of secondary and tertiary fatty acids, and vinyl pivalate having 5 carbon atoms, particularly vinyl of tertiary fatty acids such as vinyl versatate having 9 to 11 carbon atoms. Esters are preferred.

Further, in preparing a copolymer that is a dispersoid of the aqueous emulsion (A), a method of adding a carboxyl group-containing ethylenically unsaturated monomer and a vinyl ester monomer of a fatty acid having 5 or more carbon atoms Is not particularly limited, but the carboxyl group-containing ethylenically unsaturated monomer and the vinyl ester-based monomer of a fatty acid having 5 or more carbon atoms are uniformly mixed with the vinyl ester-based monomer of a fatty acid having 4 or less carbon atoms. Or a method of adding all of the carboxyl group-containing ethylenically unsaturated monomer and the vinyl ester-based monomer of a fatty acid having 5 or more carbon atoms to the monomers to be added at the initial stage of the polymerization. To be

The aqueous emulsion constituting the aqueous emulsion composition of the present invention is the above-mentioned vinyl alcohol polymer having an α-olefin unit having 4 or less carbon atoms (hereinafter sometimes abbreviated as α-olefin modified PVA). A conventionally known polymerization initiator using an aqueous solution as a dispersant (eg, hydrogen peroxide, ammonium persulfate, potassium persulfate, etc.)
In the presence of, a vinyl ester-based monomer of a fatty acid having 4 or less carbon atoms, a carboxyl group-containing ethylenically unsaturated monomer, and a monomer containing a vinyl ester-based monomer of a fatty acid having 5 or more carbon atoms are added. It is obtained by emulsion polymerization by adding temporarily or continuously. In addition, a vinyl ester-based monomer of a fatty acid having 4 or less carbon atoms, a carboxyl group-containing ethylenically unsaturated monomer and a vinyl ester-based monomer of a fatty acid having 5 or more carbon atoms are previously prepared in an α-olefin modified PVA aqueous solution. It is also possible to employ an emulsion polymerization method in which it is emulsified and then continuously added to the polymerization reaction system. Further, at the time of emulsion polymerization, another copolymerizable ethylenically unsaturated monomer may be used within a range that does not impair the effects of the present invention. Examples of such ethylenically unsaturated monomers include olefins such as ethylene, propylene and isobutylene, halogenated olefins such as vinyl chloride, vinyl fluoride, vinylidene chloride and vinylidene fluoride, methyl acrylate, ethyl acrylate and acrylic. Acrylic acid esters such as butyl acrylate, 2-ethylhexyl acrylate, dodecyl acrylate, 2-hydroxyethyl acrylate, methyl methacrylate, ethyl methacrylate, butyl methacrylate, 2-ethylhexyl methacrylate, dodecyl methacrylate, methacrylic acid 2 -Methacrylic acid esters such as hydroxyethyl, dimethylaminoethyl acrylate, dimethylaminoethyl methacrylate and quaternary products thereof, and further acrylamide, methacrylamide, N, N-dimethyl Polyacrylamide, acrylamide-based monomers such as acrylamido-2-methylpropanesulfonic acid and its sodium salt, styrene-based monomers such as styrene, α-methylstyrene, p-styrenesulfonic acid and sodium and potassium salts, and other N -Vinylpyrrolidone, etc., butadiene, isoprene,
Examples thereof include diene-based monomers such as chloroprene, which may be used alone or in admixture of two or more. The amount of the α-olefin modified PVA used is not particularly limited, but a vinyl ester monomer of a fatty acid having 4 or less carbon atoms,
It is preferably 1 to 30 parts by weight, more preferably 2 to 100 parts by weight of a polymer (dispersoid) of a carboxyl group-containing ethylenically unsaturated monomer and a vinyl ester monomer of a fatty acid having 5 or more carbon atoms. It is in the range of 20 parts by weight. If the amount used is less than 1 part by weight or more than 30 parts by weight, the polymerization stability may be lowered, or the water resistance of the aqueous emulsion composition may be lowered. As the aqueous emulsion in the present invention, the aqueous emulsion obtained by the above method can be used as it is, but if necessary, various conventionally known emulsions may be added and used within a range not impairing the effects of the present invention. You can As the dispersant in the aqueous emulsion used in the present invention, α-olefin-modified PVA is used. If necessary, a conventionally known anionic, nonionic or cationic surfactant or PVA-based polymer is used. , Hydroxyethyl cellulose and the like can also be used in combination.

The aluminum compound (B) used in the present invention is not particularly limited, but water-soluble aluminum compounds are preferably used, and specifically, aluminum chloride, aluminum nitrate and hydrates thereof, and aluminum sulfate (sulfuric acid). Bands) are preferably used. Among them, aluminum chloride and aluminum nitrate are more preferably used.

In the aqueous emulsion composition of the present invention, the compounding amount of the aluminum compound (B) with respect to the aqueous emulsion is 0.01 to 5 parts by weight based on 100 parts by weight (solid content) of the aqueous emulsion (A). Preferably, 0.02 to 3 parts by weight, more preferably 0.03 to
It is more preferably 2.5 parts by weight. When the compounding ratio of the aluminum compound (B) is less than 0.01 part by weight,
The water resistance and solvent resistance of the aqueous emulsion composition decrease,
If it exceeds 5 parts by weight, the storage stability of the aqueous emulsion composition at high temperature may be deteriorated.

It is important that the aqueous emulsion composition of the present invention has a pH of 2 to 5, preferably 2.
It is 5 to 4, more preferably 2.7 to 3.5. When the pH of the aqueous emulsion composition is lower than 2, the storage stability at high temperature is lowered and it is not suitable. When the pH is higher than 5, the viscosity of the aqueous emulsion composition becomes abnormally high and the water resistance is poor, which is not suitable.

The compound used for adjusting the pH of the aqueous emulsion composition is not particularly limited, and can be appropriately adjusted with an alkaline compound such as aqueous ammonia, caustic soda, and triethanolamine. Further, the method of adding the alkali compound and the aluminum compound is not particularly limited, but a method of adding the aluminum compound after adjusting the pH of the aqueous emulsion composition with the alkali compound is preferably used.

The aqueous emulsion composition of the present invention contains various organic solvents such as toluene, perkrene, dichlorobenzene, and trichlorobenzene in order to adjust its drying property, setting property, viscosity, film-forming property, etc., if necessary. , Starch, modified starch, oxidized starch, sodium alginate,
Water-soluble polymers such as carboxymethyl cellulose, methyl cellulose, maleic anhydride / isobutene copolymer, maleic anhydride / styrene copolymer, maleic anhydride / methyl vinyl ether copolymer, urea / formalin resin, urea / melamine / formalin resin , Thermosetting resin such as phenol / formalin resin, filler such as clay, kaolin, talc, calcium carbonate, wood powder, etc.
A filler such as wheat flour, a pigment such as titanium oxide or the like, and various additives such as a plasticizer, an antifoaming agent, an antifreezing agent, an antiseptic and a rust preventive may also be contained. Examples of the plasticizer include dibutyl phthalate, ethylene glycol monophenyl ether, texanol and the like. The aqueous emulsion composition of the present invention has excellent water resistance and solvent resistance,
In addition, by utilizing the feature of excellent storage stability at high temperature, water-resistant and solvent-resistant adhesive applications, for example, the surface of laminated wood obtained by using an emulsion as an adhesive is coated with an organic solvent-based paint. It is used for various adhesive applications such as coating, and other applications such as woodworking adhesives, paper processing adhesives, paints, and fiber treatment agents. In the present invention, examples of the solvent-resistant “solvent” include organic solvents such as acetone, toluene, ethanol, methanol, isopropanol, normal propanol, methyl acetate and ethyl acetate.

[0022]

The present invention will be described in more detail with reference to Examples and Comparative Examples. In the following Examples and Comparative Examples, "part" and "%" mean weight basis unless otherwise specified.

Aqueous Emulsion Production Example 1 A 1 liter glass polymerization container equipped with a reflux condenser, a dropping funnel, a thermometer and a nitrogen inlet was placed in an ion exchange water 300.
g, PVA-1 (polymerization degree 1000, saponification degree 99 mol%, ethylene modification amount 7 mol%), and sodium acetate 0.5 g were charged, and the mixture was stirred at 95 ° C. for 2 hours and completely dissolved. Next, after cooling this PVA aqueous solution and replacing with nitrogen, 20
After the temperature was raised to 60 ° C. while stirring at 0 rpm, 26 g of vinyl acetate and 0 g of acrylic acid were added while continuously dropping 15 g of a 20% aqueous solution of sodium tartrate and 30 g of 5% hydrogen peroxide solution over 2.5 hours. .26 g, vinyl versatate {"Veova" manufactured by Ciel Chemical Co., Ltd.
10 "} 0.26 g was charged and the polymerization was started. It was confirmed that the initial polymerization was completed 30 minutes after the initiation of the polymerization. Next, 234 g of vinyl acetate, 2.34 g of acrylic acid and 2.34 g of vinyl versatate were continuously added over 2 hours,
The polymerization was completed, and a polyvinyl acetate emulsion having a pH of 2 and a solid content concentration of 49% (containing 1 part by weight of acrylic acid and vinyl versatate per 100 parts by weight of vinyl acetate unit) was obtained. To 100 parts by weight of this emulsion (solid content), 10 parts of dibutyl phthalate was added and mixed (Em-1).

Aqueous Emulsion Production Example 2 PVA-2 (polymerization degree 1700, saponification degree 95) was used instead of using PVA-1 in the aqueous emulsion production example 1.
A polyvinyl acetate emulsion having a pH of 1.9 and a solid content concentration of 48.9% was obtained in the same manner as in Aqueous Emulsion Production Example 1 except that the mol% and the ethylene modification amount were 3 mol%). To 100 parts by weight (solid content) of this emulsion, 10 parts of dibutyl phthalate was added and mixed (Em-
2).

Aqueous Emulsion Production Example 3 The same procedure as in Aqueous Emulsion Production Example 1 except that methacrylic acid was used instead of acrylic acid in Aqueous Emulsion Production Example 1, pH 2.1, and solid content concentration 48.9.
% Polyvinyl acetate emulsion was obtained. To 100 parts by weight (solid content) of this emulsion, 10 parts of dibutyl phthalate was added and mixed (Em-3).

Aqueous Emulsion Production Example 4 A polyvinyl acetate emulsion having a pH of 2.1 and a solid content concentration of 49% was obtained in the same manner as in Aqueous Emulsion Production Example 1 except that Veova 10 was not used. . To 100 parts by weight (solid content) of this emulsion, 10 parts of dibutyl phthalate was added and mixed (Em-4).

Aqueous Emulsion Preparation Example 5 Aqueous emulsion except that PVA-3 (PVA-117 manufactured by Kuraray; polymerization degree 1700, saponification degree 98.5 mol%) was used instead of PVA-1. An aqueous emulsion (Em-5) was obtained in the same manner as in Emulsion Production Example 1.

Example 1 p of "Em-1" obtained in Production Example 1 of aqueous emulsion
After H was adjusted to pH 5.2 with aqueous ammonia, 1 part by weight of aluminum nitrate nonahydrate was added to 100 parts by weight (solid content) of the emulsion to prepare an aqueous emulsion composition. It was 1. The water resistance, solvent resistance, and storage stability at high temperature of the film of the obtained aqueous emulsion composition were evaluated in the following manner. The results are shown in Table 1.

(Evaluation of Emulsion Composition) Water Resistance of Film The obtained aqueous emulsion composition was cast on polyethylene terephthalate (hereinafter abbreviated as PET) at 20 ° C. and 65% RH and dried for 7 days. To obtain a dry film having a thickness of 500 μm. When this film was punched out to a diameter of 2.5 cm and immersed in boiling water as a sample for 4 hours,
The water absorption rate and elution rate of the film were determined. Dissolution rate (%): {1- (Film absolute dry weight after immersion / Film absolute dry weight before immersion)} × 100 Water absorption rate (%): {(Film water absorbed weight after immersion / Film absolute dry before immersion) Weight) -1} × 100 * film absolute dry weight before immersion; film weight before immersion (water content)-
(Film weight before immersion (water content) x water content (%) / 10)
0) * Water content of film: The film (a sample different from the sample immersed in boiling water) is dried at 105 ° C for 4 hours, and the water content of the film is determined in advance. * Extremely dry weight of the film after soaking; the weight of the film after soaking in 105 ° C for 4 hours. Water absorption weight of the film after immersion: The weight of the film after immersion was taken up from water, and the water on the film was wiped off with gauze and weighed. (2) Solvent resistance The obtained aqueous emulsion composition was cast on PET at 20 ° C. and 65% RH and dried for 7 days to give a thickness of 500 μm.
m dry film was obtained. This coating was punched out to a diameter of 2.5 cm, and when it was used as a sample and immersed in acetone for 24 hours, the liquid absorption rate and elution rate of the coating were determined. Dissolution rate (%): {1- (absolute dry weight of film after immersion / absolute dry weight of film before immersion)} x 100 Liquid absorption rate (%): {(weight of absorbed liquid after immersion / film before immersion) Absolute dry weight) -1} x 100 * Absolute dry weight of the coating before immersion; Coating weight before immersion (water content)-
(Film weight before immersion (water content) x water content (%) / 10)
0) * Water content of film: The film (a sample different from the sample immersed in acetone) is dried at 105 ° C for 4 hours, and the water content of the film is determined in advance. * Extremely dry weight of the film after soaking; the weight of the film after soaking in 105 ° C for 4 hours. Absorbed weight of the film after immersion: The weight of the film after immersion was lifted from acetone, and the acetone on the film was wiped off with gauze and weighed. (3) Storage stability under high temperature The state after the emulsion composition was left at 60 ° C for 4 weeks was observed.

Example 2 A test was conducted in the same manner as in Example 1 except that 0.5 part by weight of aluminum chloride was used instead of 1 part by weight of aluminum nitrate nonahydrate in Example 1. The results are also shown in Table 1.

Comparative Example 1 A test was conducted in the same manner as in Example 1 except that aluminum nitrate nonahydrate was not used in Example 1. The results are also shown in Table 1.

Example 3 Example 1 was repeated except that the "Em-2" obtained in the aqueous emulsion production example 2 was used in place of the "Em-1" obtained in the aqueous emulsion production example 1 in the example 1. The test was conducted in the same manner. The results are also shown in Table 1.

Example 4 Example 1 was repeated except that “Em-3” obtained in Aqueous Emulsion Production Example 3 was used in place of “Em-1” obtained in Aqueous Emulsion Production Example 1 in Example 1. The test was conducted in the same manner. The results are also shown in Table 1.

Comparative Example 2 As Example 1 except that the “Em-1” obtained in Example 1 was replaced with the “Em-4” obtained in Example 4 of aqueous emulsion. The test was conducted in the same manner. The results are also shown in Table 1.

Comparative Example 3 The same as Example 1 except that "Em-5" obtained in Aqueous Emulsion Production Example 5 was used in place of "Em-1" obtained in Aqueous Emulsion Production Example 1 in Example 1. The test was conducted in the same manner. The results are also shown in Table 1.

Comparative Example 4 A test was conducted in the same manner as in Example 1 except that aluminum nitrate nonahydrate was added without adjusting the pH of the aqueous emulsion. PH of aqueous emulsion composition
Was 1.8. The results are also shown in Table 1.

Comparative Example 5 A test was conducted in the same manner as in Example 1 except that the pH of the aqueous emulsion in Example 1 was adjusted to pH 7.5 with aqueous ammonia and aluminum nitrate nonahydrate was added in the same manner. The pH of the aqueous emulsion composition was 5.5. The results are also shown in Table 1.

[0038]

[Table 1]

[0039]

The aqueous emulsion composition of the present invention has excellent water resistance and solvent resistance, and further has excellent storage stability at high temperatures, and is used as an adhesive for woodworking, an adhesive for plywood, a paper processing agent, and a paint. It is widely and suitably used as a fiber processing agent.

Claims (5)

[Claims] 1. A vinyl alcohol polymer containing 1 to 20 mol% of an α-olefin unit having 4 or less carbon atoms in a molecule and having a saponification degree of 90 mol% or more is used as a dispersant, and a fatty acid having 4 or less carbon atoms is prepared. 0.1 to 10 parts by weight of a carboxyl group-containing ethylenically unsaturated monomer unit and 100 to parts by weight of a vinyl ester monomer unit, and a vinyl ester monomer unit of a fatty acid having 5 or more carbon atoms of 0.1 to 0.1 part by weight. An aqueous emulsion composition comprising an aqueous emulsion (A) containing a polymer containing 15 parts by weight as a dispersoid and an aluminum compound (B) and having a pH of 2 to 5. 2. The aqueous emulsion composition according to claim 1, wherein the α-olefin unit having 4 or less carbon atoms is an ethylene unit. 3. The aqueous emulsion composition according to claim 1, wherein the aluminum compound (B) is at least one compound selected from aluminum chloride, aluminum nitrate and aluminum sulfate. 4. The aqueous emulsion composition according to claim 1, wherein the carboxyl group-containing ethylenically unsaturated monomer is at least one compound selected from acrylic acid and methacrylic acid. 5. The vinyl ester monomer of a fatty acid having 4 or less carbon atoms is vinyl acetate, and the vinyl ester monomer of a fatty acid having 5 or more carbon atoms is a vinyl ester of a tertiary fatty acid. The aqueous emulsion composition according to any one of 1 to 4.