JP3342883B2 - Re-emulsifiable synthetic resin emulsion powder composition and method for producing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a re-emulsifiable synthetic resin emulsion powder composition and a method for producing the same. More specifically, the present invention relates to a re-emulsifiable synthetic resin emulsion powder composition containing no inorganic fine powder as an anti-caking agent and a method for producing a re-emulsifiable synthetic resin emulsion powder composition not requiring an inorganic fine powder as an anti-caking agent. .

[0002]

2. Description of the Related Art A re-emulsifiable synthetic resin emulsion powder is
Generally, this is a powder obtained by spray-drying a synthetic resin aqueous emulsion using a water-soluble polymer compound as a protective colloid, and particularly a powder that is re-emulsified when added to water and stirred. Re-emulsification here means that the synthetic resin emulsion powder dispersed in water does not simply disperse in the size of the particles in the powder state, but becomes particles of approximately the same size as the original synthetic resin emulsion resin particles. Emulsification means that the re-emulsified liquid becomes an emulsion having substantially the same properties as the original synthetic resin emulsion. Since the re-emulsifiable synthetic resin emulsion powder has such properties, it can be used for a wide range of applications in which the synthetic resin emulsion is used, for example, adhesives, paint binders, and fiber treatment agents. Particularly, it is useful as a cement admixture or a binder for powder coatings as an application utilizing characteristics of a powder.

[0003]

There are some re-emulsifiable synthetic resin emulsion powders in which the re-emulsion does not form a film at room temperature. However, re-emulsifiable emulsion powders that dry at room temperature to form a film, as evident from their main use as adhesives, paints, fiber treatment agents, paper processing agents, etc., are particularly useful.

[0004] In order to form a film at room temperature, the re-emulsifiable synthetic resin emulsion powder has a glass transition point of 2 for the synthetic resin.
The temperature must be 0 ° C. or lower, but since such a synthetic resin is soft, the emulsion powder has a property of easily adhering to each other. In particular, the lower the glass transition point of the synthetic resin, the easier it is to bond. For this reason, there is a serious problem that the powder particles adhere to each other during the production or storage and storage of the re-emulsifiable synthetic resin emulsion powder, and the re-emulsifiability is lost.

In particular, when an aqueous vinyl-based synthetic resin emulsion having a glass transition point of 20 ° C. or lower is used, even if spray-dried as it is, the synthetic resin powder particles are caking and blocked during drying, so that a re-emulsifiable powder can be obtained. could not. Means for preventing caking between powder particles are silica, calcium carbonate, aluminum silicate and the like having an average particle size of 0.01 to 0.1.
There is known a method in which a synthetic resin powder particle formed by adding a 5 μm inorganic fine powder during the production of a re-emulsifiable synthetic resin emulsion powder is coated with the inorganic fine powder to prevent caking.

However, a sufficient anti-caking effect cannot be obtained unless the inorganic fine powder is used in an amount of 3 to 30% by weight based on the synthetic resin as an anti-caking agent. The properties of emulsifying synthetic resin emulsified powder were significantly reduced.

From the viewpoint of the re-emulsifiable synthetic resin emulsion powder, the inorganic fine powder is an impurity, and it is natural that it is better not to mix it. The use of the re-emulsifiable synthetic resin emulsion powder is extremely limited due to the impurities. Was. Even in the case of cement admixtures which are considered to have little problem even if inorganic fine powder is mixed in the use of the re-emulsifiable synthetic resin emulsion powder, the flow value is increased due to the large water absorption of the inorganic fine powder, The cement ratio had to be increased. There was also a problem that the obtained cement product had a large water absorption. In addition, the inorganic fine powder is liable to float, and there is a problem in operation that the inorganic fine powder is mixed in exhaust gas from the spray dryer.

[0008] Accordingly, a re-emulsifiable synthetic resin emulsion powder containing no inorganic fine powder and having a glass transition point of 20 ° C or less (hereinafter referred to as a re-emulsifiable synthetic resin emulsion powder having a low glass transition point) is strongly demanded, and the prevention of caking is required. Development of a method for producing a re-emulsifiable synthetic resin emulsion powder without using an inorganic fine powder as an agent is required. However,
In the re-emulsifiable synthetic resin emulsion powder that forms a film by drying at room temperature, no effective anti-caking agent is known other than the inorganic fine powder, and a low glass transition point without using the inorganic fine powder is required. A method for producing an emulsifying synthetic resin emulsion powder has not been disclosed.

[0009]

Means for Solving the Problems The present inventors have developed a re-emulsifiable synthetic resin powder composition containing no inorganic fine powder and a re-emulsifiable synthetic resin powder composition containing no inorganic fine powder as an anti-caking agent. As a result of intensive research on the manufacturing method,
Obtained the knowledge that synthetic resin powder particles of a vinyl synthetic resin aqueous emulsion having a high glass transition point are useful as an anti-caking agent, and spray-dried two types of vinyl synthetic resin aqueous emulsions having different glass transition points. As a result, a re-emulsifiable synthetic resin emulsion powder composition having a low glass transition point containing no inorganic fine powder was obtained, and the present invention was completed.

That is, the present invention relates to "(1) (A) a vinyl-based aqueous synthetic resin emulsion obtained by polymerizing a water-soluble polymer compound as a protective colloid and / or a vinyl-based aqueous synthetic resin emulsion obtained by copolymerizing an unsaturated carboxylic acid. A glass-based synthetic resin aqueous emulsion (solid content) having a glass transition point of 20 ° C. or less (solid content), which becomes a re-emulsifiable powder by spray drying, and (B) a vinyl-based glass transition point of 80 ° C. or more Re-emulsifiable synthetic resin emulsion powder composition obtained by spray-drying 50 to 5 parts by weight of synthetic resin aqueous emulsion (solid content) (2) (B) Vinyl-based synthetic resin aqueous emulsion having a glass transition point of 80 ° C or higher 2. The re-emulsifiable synthetic resin emulsion according to claim 1, which is an aqueous emulsion of a vinyl synthetic resin which does not become a re-emulsifiable powder by spray drying. John powder composition (3) (B) The re-emulsification according to item 1, which is a vinyl-based synthetic resin emulsion which becomes a re-emulsifiable powder by spray-drying a vinyl-based synthetic resin emulsion having a glass transition point of 80 ° C or higher. Water-soluble synthetic resin emulsion powder composition (4) (A) Vinyl-based aqueous synthetic resin emulsion obtained by polymerizing a water-soluble polymer compound as a protective colloid and / or
Alternatively, an aqueous vinyl-based synthetic resin emulsion obtained by copolymerizing an unsaturated carboxylic acid and having a glass transition point of 20 ° C. or less (solid content), which becomes a re-emulsifiable powder by spray-drying, is 50 to 95. Parts by weight and (B) 50 to 5 parts by weight of an aqueous vinyl-based synthetic resin emulsion (solid content) having a glass transition point of 80 ° C. or higher, and the temperature of the vinyl resin particles of (B) is kept below the glass transition point. A method for producing a re-emulsifiable synthetic resin emulsion powder composition, comprising spray drying while keeping the composition. (5) (A) a vinyl-based aqueous synthetic resin emulsion obtained by polymerizing a water-soluble polymer compound as a protective colloid, and / or
Alternatively, an aqueous vinyl-based synthetic resin emulsion obtained by copolymerizing an unsaturated carboxylic acid and having a glass transition point of 20 ° C. or less (solid content), which becomes a re-emulsifiable powder by spray-drying, is 50 to 95. Parts by weight and (B) 50 to 5 parts by weight of a vinyl synthetic resin aqueous emulsion (solid content) having a glass transition point of 80 ° C. or higher are separately sprayed to bring the temperature of the vinyl resin particles of (B) below the glass transition point. A method for producing a re-emulsifiable synthetic resin emulsion powder composition, wherein the composition is kept and dried at the same time. (6) The re-emulsifiable composition described in (4) or (5) above, wherein the temperature of the dried powder of the vinyl resin particles (B), which has changed from a floating state to a deposited state by spray drying, is kept below the glass transition point of the resin particles. A method for producing a resin emulsion. (7) The resin according to item 4 or 5, wherein (B) the aqueous vinyl-based synthetic resin emulsion having a glass transition point of 80 ° C. or higher is not converted into a re-emulsifiable powder by spray drying. A method for producing an emulsifying synthetic resin emulsion powder composition (8) (B) The vinyl synthetic resin aqueous emulsion described in Item 4 or 5 which is a vinyl synthetic resin aqueous emulsion which becomes a re-emulsifiable powder by spray-drying a vinyl synthetic resin aqueous emulsion having a glass transition point of 80 ° C or higher. A method for producing an emulsifying synthetic resin emulsion powder composition. About.

In order to form a film by drying the re-emulsified liquid at room temperature as described above, the glass transition point of the vinyl-based synthetic resin of the vinyl-based synthetic resin aqueous emulsion to be a re-emulsifiable powder must be 20 ° C. Or less, and particularly preferably 0 ° C. or less.

The vinyl-based synthetic resin aqueous emulsion used as the low glass transition point re-emulsifiable powder used in the present invention is prepared by emulsion polymerization of a vinyl-based monomer with a water-soluble polymer compound as a protective colloid, An aqueous emulsion obtained by increasing the hydrophilicity of the vinyl-based synthetic resin particles in the aqueous vinyl-based synthetic resin emulsion by copolymerizing a certain unsaturated carboxylic acid or the like is used. The vinyl monomer is not particularly limited, but examples thereof include polymers and copolymers such as vinyl acetate, vinyl versatate, acrylate, methacrylate, styrene, and vinyl chloride. Particularly, an ethylene-vinyl acetate copolymer and a vinyl acetate-vinyl versatate vinyl ester copolymer are preferred. When alkali resistance is required, a copolymer of an acrylate ester and a methacrylate ester is preferred. As the aqueous vinyl-based synthetic resin emulsion having a glass transition point of 80 ° C. or higher used in the present invention, it is particularly preferable to use an aqueous emulsion of a polymer or copolymer of methyl methacrylate (150 ° C.) or styrene (100 ° C.). preferable.

Further, by using a copolymerizable monomer having two or more cross-linking groups or unsaturated groups in combination to increase the degree of cross-linking in the synthetic resin, the heat resistance is improved and the glass transition point is reduced.
Copolymer aqueous emulsions at 0 ° C. or higher are also used.

The vinyl-based synthetic resin particles in the aqueous vinyl-based synthetic resin emulsion having a glass transition point of 80 ° C. or higher have an effect of preventing the low-glass-transition-point re-emulsifiable synthetic resin emulsion powder particles from sticking to each other. Although it is not necessary to be re-emulsifiable in itself, a low glass transition point re-emulsifiable synthetic resin emulsion In order to further improve the re-emulsifiability of the emulsion powder composition, a vinyl-based synthetic resin having a glass transition point of 80 ° C or higher is used. Aqueous emulsions are also preferably made into re-emulsifiable powders by spray drying, and spray drying by using a water-soluble polymer compound as a protective colloid or copolymerizing a hydrophilic monomer such as an unsaturated carboxylic acid. The glass transition point which becomes a re-emulsifiable powder by the
The vinyl synthetic resin aqueous emulsion described above can be obtained. Of course, such a vinyl synthetic resin aqueous emulsion can also be used in combination.

The proportion of (A) the re-emulsifiable synthetic resin emulsion having a low glass transition point and (B) the aqueous vinyl synthetic resin emulsion having a glass transition point of 80 ° C. or more is (A) 50 to 95 in terms of solid content. (B) 50 to 5 parts by weight with respect to parts by weight. (B) 50 parts by weight for (A) 50 parts by weight
If the amount is more than 5 parts by weight, film formation at room temperature drying of the re-emulsified liquid becomes insufficient. If less than 5 parts by weight of (B) with respect to 95 parts by weight of (A), caking cannot be prevented and blocking occurs during production. A re-emulsifiable synthetic resin emulsion powder cannot be obtained.

As described above, the re-emulsifiable synthetic resin emulsion powder composition of the present invention is obtained by spray-drying an aqueous vinyl synthetic resin emulsion having a low glass transition point and an aqueous vinyl synthetic resin emulsion having a glass transition point of 80 ° C. or higher. It can be obtained by: Both emulsions may be mixed and spray-dried as an aqueous emulsion, but re-emulsifiability is better when sprayed separately in a spray dryer and dried simultaneously.

What is important in the re-emulsifiable synthetic resin emulsion composition of the present invention is that the vinyl resin particles (B) must be in a powder form. Otherwise, blocking of the dried emulsion particles of (A) cannot be prevented.

For this purpose, the resin powder (B) must not be blocked during spray drying. Therefore, in the drying step, (B) the resin itself must be kept below the glass transition point. This does not mean that the drying temperature is lower than the glass transition point. During spray drying, the resin is an emulsion, contains water, and floats, so that even if the temperature of the drying atmosphere is increased, the temperature of the resin itself does not increase. As the drying proceeds and water is removed, resin particles are formed. In this state, if the temperature exceeds the glass transition point, there is a risk of blocking.

The most blocking occurs when the resin particles change from a floating state to a deposited state, and the temperature of the resin particles must be lower than the glass transition point when the deposited state is reached. Although the glass transition point differs depending on the type of the resin (B), the emulsion powder obtained when the resin powder (B) is kept below the glass transition point does not block.

[0020]

The redispersible synthetic resin emulsion powder composition of the present invention is mainly composed of a vinyl-based synthetic resin and is characterized in that inorganic fine powder is not used as an anti-caking agent. This is because both emulsions are spray-dried at the same time, and the re-emulsifiable resin fine particles are in a state of being coated with vinyl-based synthetic resin fine particles having a glass transition point of 80 ° C. or higher. This is considered to prevent the caking property of the resin.

In particular, when the resin particle size of the aqueous vinyl-based synthetic resin emulsion having a glass transition point of 20 ° C. or lower is larger than the resin particle size of the aqueous vinyl-based synthetic resin emulsion having a glass transition point of 80 ° C. or higher, the coating efficiency is improved. Good and preferred.

In particular, by keeping the temperature of the dried powder of the vinyl resin particles (B), which has changed from the floating state to the deposited state by spray drying, below the glass transition point of the resin particles, the two types of glass transition points are different. The vinyl synthetic resin particles to be present exist in the powder without losing their properties. Therefore, despite not using an inorganic fine powder as an anti-caking agent, a re-emulsifiable synthetic resin emulsion powder composition can be stably produced, and the obtained re-emulsifiable synthetic resin emulsion powder composition can be prepared in water. The emulsion is easily re-emulsified only by stirring, and a film similar to the original synthetic resin emulsion is formed only by drying the re-emulsified liquid at room temperature.

According to the present invention, it is possible to form a re-emulsion liquid having a performance close to that of the original emulsion without containing an inorganic fine powder as an anti-caking agent and containing no undesirable impurities. The re-emulsifiable synthetic resin emulsion powder composition of the present invention can be used for a wide range of applications where the synthetic resin emulsion is used, for example, adhesives, paint binders, fiber treatment agents, cement admixtures, and the like.

[0024]

The present invention will be described below with reference to examples.

Example 1 Ethylene-vinyl acetate copolymer (glass transition point: 0 ° C.) aqueous emulsion containing polyvinyl alcohol as a protective colloid at a solid content of 10% by weight (solids concentration: 50% by weight; particle diameter: 1 μm) 100 parts by weight Styrene-methyl methacrylate copolymer having a surfactant as an emulsifier (glass transition point: 103 ° C.) Aqueous emulsion (solids concentration: 50% by weight: particle size: 0.1 μm) 20 parts by weight Water: 100 parts by weight Was uniformly mixed and spray-dried under the conditions of a spray-drying atmosphere temperature of 100 ° C. and a deposition resin particle temperature of 60 ° C. to obtain a re-emulsifiable synthetic resin emulsion powder composition.

Example 2 Ethylene-vinyl acetate copolymer (glass transition point: 0 ° C.) aqueous emulsion containing polyvinyl alcohol as protective colloid at 10% by weight in the solid content of emulsion (solids concentration: 50% by weight; particle diameter: 1 μm) ) Was diluted with water to 30% by weight (A) Methyl methacrylate-ethyl methacrylate copolymer (glass transition point: 90 ° C) containing polyvinyl alcohol as a protective colloid and 10% by weight in emulsion solids as a protective colloid. Liquid (B) obtained by diluting a solid content concentration of 40% by weight: particle diameter of 0.3 μm) with water (A) and (B) from separate nozzles (A): (B) =
The mixture was sprayed at a ratio of 2: 1 and simultaneously dried under the conditions of a spray drying atmosphere temperature of 100 ° C and a deposition resin particle temperature of 60 ° C to obtain a re-emulsifiable synthetic resin emulsion powder composition.

Example 3 Vinyl acetate-vinyl versatate copolymer (glass transition point: 10 ° C.) aqueous emulsion containing polyvinyl alcohol as protective colloid at 10% by weight in the solid content of emulsion (solids concentration: 50% by weight: particles) Liquid (A) prepared by diluting 1 μm in diameter with 30% by weight (A) Internally crosslinked acrylic copolymer using a surfactant as an emulsifier (the glass transition point cannot be measured because the copolymer does not soften)
Aqueous emulsion (solid content concentration: 50% by weight: particle size: 0.1%)
Liquid (B) obtained by diluting 1 μm) with water to 30% by weight (B) (A): (B) =
The mixture was sprayed at a ratio of 2: 1 and simultaneously dried under the conditions of a spray drying atmosphere temperature of 100 ° C and a deposition resin particle temperature of 60 ° C to obtain a re-emulsifiable synthetic resin emulsion powder composition.

Example 4 Copolymer of butyl acrylate-methyl methacrylate containing polyvinyl alcohol as a protective colloid in an emulsion solid content of 10% by weight (glass transition point is -10 ° C.)
Aqueous emulsion (solid content concentration 50% by weight;
(5 μm) diluted with water to 30% by weight of water (A) Methyl methacrylate containing 10% by weight in emulsion solids of polyvinyl alcohol as a protective colloid
Ethyl methacrylate copolymer (glass transition point is 90 ° C)
Aqueous emulsion (solid content: 40% by weight: particle size: 0.1%)
(A) and (B) from separate nozzles (A): (B) =
Spraying was carried out at a ratio of 5: 4, and simultaneous drying was performed under the conditions of a spray drying atmosphere temperature of 100 ° C. and a deposition resin particle temperature of 60 ° C. to obtain a re-emulsifiable synthetic resin emulsion powder composition.

Comparative Example 1 An aqueous emulsion of an ethylene-vinyl acetate copolymer (glass transition point: 0 ° C.) containing 10% by weight in the solid content of the emulsion as a protective colloid of polyvinyl alcohol used in Example 1 was used alone. And spray dried in the same manner as in Example 1.

Comparative Example 2 An aqueous styrene-ethyl acrylate copolymer (glass transition point: 90 ° C.) aqueous emulsion containing the surfactant used in Example 1 as an emulsifier was used alone and diluted with water. Spray drying was performed in the same manner.

Comparative Example 3 In Example 2, the ratio between (A) and (B) was changed to (A):
Spray drying was carried out in the same manner as in Example 2 except that (B) = 1: 5.

Comparative Example 4 An aqueous emulsion of an ethylene-vinyl acetate copolymer (glass transition point: 0 ° C.) containing 10% by weight in the solid content of the emulsion as a protective colloid of polyvinyl alcohol used in Example 1 was reduced to 30% by weight. Liquid diluted with water (A) 15% by weight dispersion of calcium carbonate fine powder having a particle diameter of 0.1 μm in water (B) (A) and (B) are separated from separate nozzles by (A): (B) ) =
Spray at a ratio of 10: 1, spray drying atmosphere temperature 100 ° C,
Simultaneous drying was performed under the condition of a temperature of 60 ° C. for deposited resin particles.

Test The test results are shown in Table 1. 1. Observation of Workability and State of Obtained Resin Workability in spray drying in Examples and Comparative Examples was observed. The state of the obtained resin was observed. Workability ：: There was no particular problem in work. ×: Fine powder particles were mixed in the exhaust gas after spray drying. State of obtained resin 〇: The resin was obtained as a uniform powder. ×: Resin particles were caustic and blocked. (After cooling the resin, it was pulverized into a powder.)

2. Test of re-emulsifiability of resin powder 100 parts by weight of resin powder was added to 100 parts by weight of water, sufficiently stirred by a stirrer, allowed to stand, observed, and the viscosity of the re-emulsified liquid was measured. Numerical value: viscosity of re-emulsified liquid (cps) x: resin powder settled without re-emulsification.

3. Test of Properties of Re-Emulsified Liquid The state of the re-emulsified liquid applied to a glass plate and dried at room temperature was observed. 〇: A uniform and tough film was formed. ×: No film was formed. Wood was bonded to the wood using the re-emulsified liquid. 〇: Adhered, material was destroyed when the adhesion was tested. ×: No adhesion was observed.

4. Test of water absorption Using the re-emulsifiable synthetic resin emulsion powder compositions of Examples 1 to 4 and Comparative Example 4, ordinary Portland cement 100 parts by weight Standard sand 300 parts by weight Re-emulsifiable synthetic resin emulsion powder composition 10 parts by weight The water absorption of a mortar molded product prepared according to JIS A6203 (polymer dispersion for cement admixture) with the composition was measured.

[0037]

[Table 1]

[0038]

According to the present invention, a re-emulsifiable synthetic resin emulsion powder free from blocking can be produced. Since the re-emulsifiable synthetic resin emulsion powder obtained according to the present invention does not contain foreign substances such as inorganic powder, the performance of the original emulsion is not deteriorated.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI C08L 33:12 C08L 33:12 (72) Inventor Masato Kamochi 3330 Chihama, Oto-cho, Ogasa-gun, Shizuoka Prefecture Hoechst Gosei Co., Ltd. Inside

Claims (8)

(57) [Claims] 1. A (A) vinyl-based aqueous synthetic resin emulsion obtained by polymerizing a water-soluble polymer compound as a protective colloid and / or a vinyl-based aqueous synthetic resin emulsion obtained by copolymerizing an unsaturated carboxylic acid, and spray-dried. 50 to 95 parts by weight of a vinyl-based synthetic resin aqueous emulsion (solid content) having a glass transition point of 20 ° C. or less to become a re-emulsifiable powder and (B) a vinyl-based synthetic resin aqueous emulsion having a glass transition point of 80 ° C. or more (solid content) ) 50 to 5 parts by weight of a re-emulsifiable synthetic resin emulsion powder composition obtained by spray drying 2. The aqueous resin composition according to claim 1, wherein (B) the aqueous vinyl resin synthetic emulsion having a glass transition point of 80 ° C. or higher does not become a re-emulsifiable powder by spray drying. Emulsifiable synthetic resin emulsion powder composition 3. The re-emulsifiability according to claim 1, wherein (B) the vinyl-based synthetic resin emulsion having a glass transition point of 80 ° C. or higher is converted into a re-emulsifiable powder by spray drying. Synthetic resin emulsion powder composition (A) A vinyl-based aqueous synthetic resin emulsion obtained by polymerizing a water-soluble polymer compound as a protective colloid and / or a vinyl-based aqueous synthetic resin emulsion obtained by copolymerizing an unsaturated carboxylic acid, and spray-dried. 50 to 95 parts by weight of a vinyl-based synthetic resin aqueous emulsion (solid content) having a glass transition point of 20 ° C. or less to become a re-emulsifiable powder and (B) a vinyl-based synthetic resin aqueous emulsion having a glass transition point of 80 ° C. or more (solid content) (5) A method for producing a re-emulsifiable synthetic resin emulsion powder composition, comprising uniformly mixing 50 to 5 parts by weight and spray-drying while keeping the temperature of the vinyl resin particles (B) below the glass transition temperature. 5. A (A) vinyl-based aqueous synthetic resin emulsion obtained by polymerizing a water-soluble polymer compound as a protective colloid and / or a vinyl-based aqueous synthetic resin emulsion obtained by copolymerizing an unsaturated carboxylic acid, and spray-dried. 50 to 95 parts by weight of a vinyl-based synthetic resin aqueous emulsion (solid content) having a glass transition point of 20 ° C. or less to become a re-emulsifiable powder and (B) a vinyl-based synthetic resin aqueous emulsion having a glass transition point of 80 ° C. or more (solid content) And 50 to 5 parts by weight separately, and simultaneously drying while keeping the temperature of the vinyl resin particles of (B) below the glass transition temperature. 6. The method according to claim 4, wherein the temperature of the dried powder of the vinyl resin particles (B), which has changed from a floating state to a deposited state by spray drying, is kept below the glass transition point of the resin particles. A method for producing an emulsifying synthetic resin emulsion. 7. The method according to claim 4, wherein (B) the aqueous vinyl-based synthetic resin emulsion having a glass transition point of 80 ° C. or higher is not converted into a re-emulsifiable powder by spray drying. For producing a re-emulsifiable synthetic resin emulsion powder composition. 8. The method according to claim 4, wherein (B) the vinyl-based synthetic resin aqueous emulsion having a glass transition point of 80 ° C. or higher is re-emulsifiable powder by spray drying. For producing a re-emulsifiable synthetic resin emulsion powder composition.