JPS6111256B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to an aqueous synthetic resin dispersion composition used as a coating agent or adhesive. Paper and aluminum foil used as packaging materials are coated with a synthetic resin coating agent to prevent chemical changes in food products, impart water resistance, heat sealability, or laminate with other base materials. There are many things. The aluminum foil used in Priester packaging (hereinafter referred to as PTP packaging) for pharmaceutical tablets is also coated with a heat-sealing lacquer, and the packaging is done by thermally adhering it to the hard vinyl chloride sheet used as the forming film. It's on. Coating agents used for this purpose are required to have properties such as good adhesion to both aluminum foil and molded film, and the ability to be applied thinly to substrates. In recent years, polyolefins have been replacing vinyl chloride resin due to food hygiene issues.
The use of polyolefins, especially polypropylene, to replace rigid vinyl chloride resin for the molding film for PTP packaging is also being considered. Therefore, there is a need for a coating agent that can thermally bond aluminum foil and polypropylene. On the other hand, as for the coating method, the conventional method of dissolving the synthetic resin in a solvent and applying it to the base material causes the problem of air pollution, and therefore, alternatives to other methods are being considered due to environmental regulations. The applicant has an intrinsic viscosity [η] of 1.0 to 5.
Polyolefin with an intrinsic viscosity [η] of 0.04 or more
0.8, and a method for producing an aqueous dispersion of a composition comprising a carboxylic acid group-containing polyolefin having an acid value of 30 to 150. The polyolefin aqueous dispersion obtained by this method has a fine particle size and can provide a uniform coating when coated on aluminum foil, but its adhesion to aluminum foil is below the required performance and its oil and fat resistance is slightly inferior. The shortcomings became obvious. As a result of various studies to solve these drawbacks, the above points were solved by blending a small amount of an aqueous dispersion of a specific ethylene-α/β-ethylenically unsaturated carboxylic acid copolymer into the polyolefin aqueous dispersion. It has been found that this is significantly improved, and this has been achieved by the present invention. An object of the present invention is to provide an aqueous synthetic resin dispersion suitable as a coating agent for aluminum foil, in connection with the modification of an aqueous dispersion produced by the method disclosed in Japanese Patent Application No. 50-88857. Another object of the present invention is to provide an aqueous synthetic resin dispersion particularly suitable as an aluminum foil coating agent for PTP packaging. Still another object of the present invention is to provide an aqueous synthetic resin dispersion suitable as an adhesive between polypropylene and aluminum foil. That is, the present invention comprises (a) 50 to 99 parts by weight of a polyolefin having an intrinsic viscosity [η] of 1.0 to 5; and (b)
Intrinsic viscosity [η] is 0.04 to 0.8, acid value 30 to 30
An aqueous dispersion (A ), about 55 to 88% by weight of ethylene, and about 20 to 75% of the acid groups neutralized with basic alkali metal salts.
About 12 to 45% by weight of ethylenically unsaturated carboxylic acid
an aqueous dispersion (B) of an ethylene-α/β-ethylenically unsaturated random copolymer consisting of 99 to 50% by weight based on the weight of the total solids of the composition, and the solids content of the dispersion (B) is 1 to 50% by weight based on the total solids weight of the composition. be. The polyolefin (a) as used in the present invention is (i) ethylene, propylene, 1-butene, 4-methyl-1-
Resins or rubber-like materials consisting of a single or copolymer of 1-olefinic unsaturated hydrocarbons such as pentene, such as polyethylene, polypropylene, poly-1-butene, poly-4-methyl-1-pentene, ethylene, propylene, etc. Polymer, ethylene-
1-butene copolymer, propylene-1-butene copolymer, ethylene-4-methyl-1-pentene copolymer, polyisobutylene, etc., (ii) conjugated or non-conjugated diene with two or more of the above 1-olefins rubbery copolymers, such as ethylene-propylene-
Conjugated or Copolymers with non-conjugated dienes, such as ethylene-butadiene copolymers, isobutylene-isobrene copolymers, etc. Among these, ethylene-α・
Examples of resins that have long compatibility with β-ethylenically unsaturated carboxylic acid random copolymers and have good adhesion to polypropylene include ethylene-α-olefin copolymers, such as ethylene-propylene copolymers, ethylene- Preferred are 1-butene copolymer, ethylene-4-methyl-1-pentene copolymer, and the like. Furthermore, among these, the patent application filed by the applicant in 1973 is preferred because it has no adhesive properties, has good transparency, has an excellent balance between strength and elongation, and has excellent adhesion to polypropylene. −
Most preferably, an ethylene-1-butene random copolymer having an ethylene content of 85 to 95 mole %, polymerized by the method described in No. 114658, is used. It is necessary that the intrinsic viscosity [η] (measured in decalin at 135° C.) of the polyolefin is in the range of 1.0 to 5, preferably 1.5 to 3.0. If it is less than 1.0, the strength and flexibility of the film will be poor, and the adhesive strength to the substrate will be poor. On the other hand, if it exceeds 5, the particle size of the polyolefin composition in the aqueous dispersion becomes coarse, making it impossible to obtain a stable dispersion. The carboxylic acid group-containing polyolefin (component (b)) is an olefin polymer containing a carboxylic acid group and/or an acid anhydride group, and (i) the above 1-
A copolymer itself of an olefin and an unsaturated carboxylic acid described below, (ii) a partially or completely saponified copolymer of the 1-olefin and a derivative such as an ester, amide, or imide of an unsaturated carboxylic acid described below; iii) polyolefins grafted with unsaturated carboxylic acids, (iv) partially or fully saponified polyolefins grafted with unsaturated carboxylic acid derivatives such as esters, amides, imides, etc., (v) oxidized polyolefins, etc. Can be used normally. Examples of unsaturated carboxylic acids or their anhydrides include acrylic acid, methacrylic acid, maleic acid, fumaric acid, itaconic acid, citraconic acid, and 5-norbornene-2.
3-dicarboxylic acid, maleic anhydride, citraconic anhydride, itaconic anhydride, 5-norbornene-
Examples include 2,3-dicarboxylic anhydride. [η] of the carboxyl group-containing polyolefin that can be used in the present invention is 0.04 to 0.8, preferably 0.08
to 0.5. If [η] is less than 0.04, the strength and adhesion of the coating will decrease, while if it exceeds 0.8, the melt viscosity of the polyolefin composition will become too high, making it impossible to obtain a good aqueous dispersion. In the present invention, carboxyl group-containing polyolefin [η]
is a mixture of high [η] and low [η] to form the above range, and can be used in any way. Further, the acid value of the carboxyl group-containing polyolefin is required to be in the range of 30 to 150, preferably 50 to 130. Here, the acid value is the number of mg of potassium hydroxide required for neutralization per gram of sample carboxylic acid group-containing polyolefin. If the acid value is lower than 30, the stability of the polyolefin composition aqueous dispersion will be poor, and if it exceeds 150, the compatibility with component (a) will deteriorate, making it impossible to obtain a good aqueous dispersion. It also reduces the water resistance of the coating film. The polyolefin composition used in the present invention contains 50 to 99 parts by weight, preferably 70 parts by weight of the above-mentioned polyolefin.
and 50 to 1 part by weight, preferably 30 to 10 parts by weight of a carboxyl group-containing polyolefin.
It consists of parts by weight. If the amount of the carboxyl group-containing polyolefin is less than 1 part by weight, the particle size of the aqueous dispersion will become coarse and the adhesion to the substrate will be poor. On the other hand, if it exceeds 50 parts by weight, the strength and elongation of the coating will decrease, and the adhesive strength to the substrate will decrease, making it unsuitable for the purpose of the present invention. As a method for producing the aqueous dispersion (A) from the polyolefin composition described above, the polyolefin composition is melted and basic A method may be adopted in which the polyolefin contains 0.2 chemical equivalents or more of the substance relative to the carboxylic acid groups in the composition (acid anhydride groups are counted as two carboxylic acid groups) and is produced in water at a temperature equal to or higher than the melting point of the polyolefin. preferable. Here, basic substances include substances that act as bases in water such as alkali metals, alkaline earth metals, ammonia and amines, alkali metal oxides, hydroxides, weak acid salts, hydrides, and alkaline earth metals. These include substances that act as bases in water, such as oxides, hydroxides, weak acid salts, and hydrides, and alkoxides of these metals. According to the above method, an aqueous polyolefin dispersion containing no or only a small amount of surfactant can be produced. By the above method, an aqueous dispersion having an average particle size of 20 μm or less, preferably 3 μm or less, and a resin concentration of 1 to 60% by weight, preferably 10 to 50% by weight can be obtained. Polyolefin aqueous dispersion (A) described above in the present invention
The partially neutralized ethylenically unsaturated carboxylic acid (hereinafter abbreviated as ionomer) used as the resin in the aqueous dispersion (B) is a mixture of ethylene and α/β-ethylenically unsaturated carboxylic acid. ,for example,
It is a copolymer obtained by radical polymerization of acrylic acid, methacrylic acid, maleic acid, fumaric acid, their anhydrides, etc. Among these, those copolymerized with methacrylic acid are most preferred in terms of performance and easy availability. The amount of α,β-ethylenically unsaturated carboxylic acid in the ionomer is from 12% to 45% by weight, preferably from 15% to 20% by weight. If the content of unsaturated carboxylic acid is less than the above range, water dispersion will be difficult and it will be difficult to obtain a dispersion with fine particle size.
On the other hand, if the amount of unsaturated carboxylic acid exceeds the above range, the compatibility with the aqueous polyolefin dispersion (A) will be poor and a homogeneous coating film will not be formed.
Furthermore, the water resistance of the coating is reduced. In the present invention, it is necessary that 20 to 75%, preferably 30 to 60%, of the carboxylic acid groups of the ionomer in the aqueous dispersion (B) be neutralized, and if the degree of neutralization exceeds 75%, The adhesion of the coating film to aluminum foil is poor, and if it is less than 20%, the stability of the aqueous dispersion is poor. Neutralization should be done with basic alkali metal salts, such as sodium hydroxide, potassium hydroxide, etc. Neutralization with basic alkaline earth metal salts, such as calcium hydroxide, zinc hydroxide, etc. , cannot be used because the stability of the aqueous dispersion is poor. The melt index (ASTM-D-1238-65T) of the ionomer is preferably 10 or less, particularly 5 or less. As a method for producing the aqueous dispersion (B) from the above-mentioned ionomer, for example, the same method as for producing the aqueous dispersion (A) from the polyolefin, or the method described in Japanese Patent Publication No. 42-23085 can be adopted. can. By such a method, an aqueous dispersion (B) essentially free of surfactants can be obtained. In the aqueous dispersion composition of the present invention, the solid content of the aqueous dispersion (A) and the aqueous dispersion (B) is 99 to 50% by weight, preferably 90 to 70% by weight, relative to the total solid content of the aqueous dispersion. Weight % and 1 to
50% by weight, preferably in the range 10 to 30%. If the solid content of the aqueous acid solution (A) exceeds the above range, the heat sealing strength to aluminum foil will be poor;
If it is less than 50% by weight, heat sealability to polypropylene will be poor. Although it is known that a coating film made of an aqueous ionomer dispersion has adhesive properties to aluminum foil, a coating film made of the aqueous dispersion does not thermally adhere to a polypropylene film at all. The coating film obtained from the aqueous dispersion of the present invention has excellent thermal adhesion to both aluminum foil and polypropylene film. The synthetic resin aqueous dispersion composition of the present invention mainly contains the aqueous dispersion (A) of the polyolefin composition and the aqueous dispersion (B) of the ionomer. Water-soluble amino resins or water-soluble epoxy resins such as water-soluble melamine resins, water-soluble benzoguanamine resins, or polyvinyl alcohol, polyvinylpyrrolidone, polyvinyl methyl ether, polyethylene to improve the stability of the dispersion and adjust the viscosity. oxide, polyacrylamide, polyacrylic acid, carboxymethylcellulose, methylcellulose, hydroxyethylcellulose,
Organic thickeners such as glue, casein, and dextrin; inorganic thickeners such as silicon dioxide, activated clay, and bentonite; nonionic surfactants and anionic surfactants to improve the stability of aqueous dispersions; surfactants, or water-soluble polyvalent metal salts, methanol, ethanol, n-propanol, isopropanol, n-butanol, isobutanol,
Alcohols such as t-butanol, glycols such as ethylene glycol, glycol ethers such as methyl cellosolve and butyl cellosolve, higher fatty acid metal salts, plasticizers and solvents to improve the smoothness of the coating, and other rust preventive substances. antifungal agents, ultraviolet absorbers, heat stabilizers, foaming agents, pigments such as titanium white, red iron oxide, phthalocyanine, carbon black, permanent yellow, calcium carbonate, magnesium carbonate, barium carbonate, talc, aluminum hydroxide, calcium sulfate. , kaolin, mica, asbestos, mica, calcium silicate, and other fillers within the range that does not impair the object of the present invention. The aqueous dispersion of the present invention can be applied to a substrate by methods such as spraying, curtain flow coater, roll coater, brushing, and dipping. After application, baking is performed. The baking temperature varies depending on the melting point of the polyolefin composition, but it is necessary to heat at a temperature higher than the minimum film forming temperature, generally higher than the melting point of the polyolefin composition, and is 50°C to 300°C, preferably 100°C. A good film can be formed by heating at a temperature of 30 seconds to 20 minutes, preferably 1 minute to 10 minutes, at a temperature of 1 to 250°C. The thickness of the film formed by the aqueous dispersion of the present invention is preferably 1μ to 50μ, among which the thickness is 3μ to 50μ for economic efficiency and heat sealability.
Most preferably it is in the 10μ range. The aqueous dispersion of the present invention is suitable as a coating material for aluminum foil, and when coated on aluminum foil to form a film, it imparts heat sealability and food protection properties. Therefore, it can be used as a packaging material for thiokolate, caramel, cigarettes, etc. In addition, the coating film has good heat sealability with polypropylene film, so
It is particularly useful as a coating material for PTP packaging. The aqueous dispersion of the present invention can also be applied to base materials other than aluminum foil, such as metal foil, paper, textiles, glass, and synthetic resin films, for various purposes such as providing water resistance, heat sealability, and improving strength. can be used. Next, the present invention will be specifically explained with reference to Examples. Example 1 80 g of ethylene-1-butene random copolymer with [η] of 1.8, density of 0.900 g/cm ³ , melting point of 75°C, and ethylene content of 90 mol% (a) component and acrylic acid grafted polyethylene wax ([ η] 0.18, acid value 85, melting point 110°C) 20 g of component (b) were melt-mixed at 170°C. 0.3 of water and 1.7 g of potassium hydroxide were placed in a pressure-resistant homomixer having an internal volume of 1, heated to 160° C., and the molten mixture was charged over 2 hours while stirring at 5000 rpm. The resin concentration of the aqueous dispersion (A) obtained by cooling to room temperature with further stirring for 30 minutes was 25% by weight, and the viscosity was
The average particle size was 18cps (25°C) and 2μ. On the other hand, 100 g of partially neutralized ethylene-methacrylic acid copolymer (melt index (190°C) 0.8, methacrylic acid content 15% by weight, degree of neutralization 59%, neutralizing agent sodium hydroxide) Melt water at 250℃ and add 0.3
The mixture was charged into a pressure-resistant homomixer having an internal volume of 1 and heated to 170°C for about 2 hours while stirring at 1000 rpm. The resin concentration of the aqueous dispersion (B) obtained by cooling to room temperature while stirring for an additional 30 minutes was 25% by weight.
The viscosity was 700 cps (25°C) and the average particle size was 1 μm or less. Mix 90 parts by weight of the aqueous dispersion (A) obtained by the above method and 10 parts by weight of the aqueous dispersion (B), and further add this aqueous dispersion.
A mixture of 100 parts by weight and 6 parts by weight of butyl cellosolve was coated on a 50 μm thick aluminum foil using a bar coater and baked at 170° C. for 3 minutes to form a film about 5 μm thick. Next, this aluminum foil and 200 μ thick polypropylene (Mitsui Polypro F600, manufactured by Mitsui Petrochemicals) were overlapped with the coating surface interposed, and the heat sealer (manufactured by Toyo Seiki) was used at a temperature of 180°C and a pressure of 1 kg/cm ² Seal bar width 5mm for 1 second
After heat-sheeting, it was left to cool. from this sample
A test piece with a width of 15 mm was cut and the peel strength was measured at a crosshead speed of 200 mm/min. In addition, the peel strength after heat-sealing was determined in the same manner except that the aluminum foils were overlapped with the coated surfaces interposed and the heat-sealing temperature was 120°C. The results are shown in Table 1. Examples 2 to 5, Comparative Example 1 The same procedure as in Example 1 was conducted except that the mixing ratio of the aqueous dispersion (A) and the aqueous dispersion (B) was as shown in Table 1. The results are shown in Table 1. Comparative Example 2 The same procedure as in Example 1 was carried out except that only the aqueous dispersion (A) was applied to the aluminum foil. The results are shown in Table 1. Comparative Example 3 The same procedure as in Example 1 was carried out except that only the aqueous dispersion (B) was applied to the aluminum foil. The results are shown in Table 1.

[Table] Example 6, Comparative Example 4 Ionomers with a degree of neutralization of 75% and 100% obtained by dissolving a predetermined amount of potassium hydroxide in water when producing the aqueous dispersion (B) Example 1 was carried out in the same manner as in Example 1, except that the aqueous dispersion of was used as the component (B). The results are shown in Table 2. Example 7 Melt index as an ionomer
5.0, methacrylic acid content 15% by weight, neutralization degree 54
%, and the same procedure as in Example 1 was carried out except that the ethylene-methacrylic acid copolymer partial metal salt of sodium hydroxide was used as the neutralizing agent. The results are shown in Table 2. Comparative example 5 As an ionomer, melt index 14,
The methacrylic acid content is 15% by weight, the degree of neutralization is 20%, the neutralizer is an ethylene-methacrylic acid copolymer partial metal salt of zinc hydroxide, and a predetermined amount of potassium hydroxide is dissolved in water in advance. An aqueous dispersion (B) of an ionomer with a degree of neutralization of 100% was prepared in the same manner as in Example 1 except for this, and an aqueous dispersion with an average particle size of 6 μm was obtained. This aqueous dispersion underwent phase separation after 20-30 minutes. 10 parts by weight of the aqueous dispersion (B) and 90 parts by weight of the aqueous dispersion (A) obtained in the same manner as in Example 1 were mixed and tested in the same manner as in Example 1. The results are shown in Table 2. Comparative example 6 As an ionomer, melt index 10,
An attempt was made to prepare an aqueous dispersion (B) in the same manner as in Example 1 using a copolymer with a methacrylic acid content of 11% by weight, a degree of neutralization of 37%, and a neutralizing agent of sodium hydroxide, but the average particle size was 25μ. A dispersion was obtained. This aqueous dispersion immediately caused phase separation, and when coated with a bar coater, it produced streaks and could not be coated uniformly. Comparative Example 7 Using the resin used in Comparative Example 6 as the ionomer, an aqueous dispersion (B) was prepared in the same manner as in Comparative Example 5, and tested in the same manner as in Example 1. The results are shown in Table 2. Comparative Example 8 As an ionomer, melt index 5,
An aqueous dispersion (B) was produced in the same manner as in Comparative Example 5, using a copolymer with a methacrylic acid content of 11% by weight, a degree of neutralization of 56%, and a neutralizing agent, zinc hydroxide. Only a dispersion was possible. This aqueous dispersion immediately caused phase separation and could not be coated uniformly with a bar coater.

[Table] Example 8 As component (b), instead of acrylic acid grafted polyethylene wax, [η] = 0.2, acid value 50, melting point
Example 1 was carried out in the same manner as in Example 1, except that a maleic anhydride grafted polyethylene wax at 115°C was used.
The results are shown in Table 3. Comparative Example 9 Component (b) has [η] of 0.11, acid value of 20, and melting point of 123.
An aqueous dispersion was prepared in the same manner as in Example 5, except that maleic anhydride-grafted polyethylene wax at ℃ was used.
I got (A). The particles in this aqueous dispersion have an average particle size of 50μ
The above immediately caused layer separation. A composition using this aqueous dispersion could not be uniformly coated onto aluminum foil using a bar coater. Comparative Example 10 In Example 1, instead of the mixture of ethylene-1-butene random copolymer and acrylic acid grafted polyethylene wax, [η] was 0.95, oxidation 20,
Acrylic acid grafted ethylene-1- with melting point 120℃
The same procedure as in Example 1 was carried out except that only 100 g of the butene copolymer was used. The average particle size of the resulting aqueous dispersion was 50 μm, and phase separation occurred almost completely within 1 hour after the dispersion was allowed to stand still. Example 9 An aqueous dispersion was obtained in the same manner as in Example 1, except that an ethylene-propylene copolymer with [η] = 2.0 and a density of 0.900 g/cm ³ was used instead of the ethylene-1-butene random copolymer. Ta. This dispersion had a resin concentration of 25% by weight, a viscosity of 18 cps, and an average particle size of 3.5 microns. The same procedure as in Example 1 was carried out except that this aqueous dispersion was used as the aqueous dispersion (A). The results are shown in Table 3. Comparative example 11 (a) component: [η] = 0.75, melting point 70℃, density
The same procedure as in Example 1 was carried out except that 0.905 g/cm ³ of ethylene-1-butene random copolymer was used. The results are shown in Table 3.

[Table] Polyethylene wax
AAPEWAX ……Acrylic acid graft poly
ethylene wax

Claims (1)

[Scope of Claims] 1 (a) 50 to 99 parts by weight of a polyolefin having an intrinsic viscosity [η] of 1.0 to 5, and (b) a carboxylic acid group having an intrinsic viscosity [η] of 0.04 to 0.8 and an acid value of 30 to 150. An aqueous dispersion (A) of a polyolefin composition (here, the amounts of component (a) and component (b) are selected such that the sum thereof is 100 parts by weight) containing 1 to 50 parts by weight of polyolefin, and ethylene. 55 to 88
% by weight and 12 to 45% by weight of α, β-ethylenically unsaturated carboxylic acid in which 20 to 75% of the acid groups have been neutralized with a basic alkali metal salt. an aqueous dispersion (B) of an acid random copolymer, the solid content of the dispersion (A) in the composition is 99 to 50 parts by weight based on the weight of the total solid content of the composition, and the dispersion An aqueous synthetic resin dispersion composition, wherein the solid content of (B) is 1 to 50% by weight based on the total solids weight of the composition. 2. The aqueous dispersion composition according to claim 1, wherein the ponoolefin in (a) is an ethylene-propylene copolymer, an ethylene-1-butene copolymer, or an ethylene-4-methyl-1-pentene copolymer. thing. 3. The aqueous dispersion composition according to claim 2, wherein the ethylene-1-butene copolymer is an ethylene-1-butene random copolymer having an ethylene content of 85 to 95 mol%. 4 The intrinsic viscosity [η] of the polyolefin in (a) is 1.5
The aqueous dispersion composition according to claim 1, wherein the aqueous dispersion composition has a molecular weight of 3.0 to 3.0. 5. The aqueous dispersion composition according to claim 1, wherein the carboxylic acid group-containing polyolefin (b) is a polyethylene wax grafted with an unsaturated carboxylic acid. Claim 1, wherein [η] of the carboxylic acid group-containing polyolefin of 6(b) is 0.08 to 0.5.
The aqueous dispersion composition described in . 7 The acid value of the carboxylic acid group-containing polyolefin is 50
The aqueous dispersion composition according to claim 1, wherein the aqueous dispersion composition ranges from 130 to 130. 8 The polyolefin composition contains 70 to 90 parts by weight of polyolefin, carboxylic acid group-containing polyolefin
An aqueous dispersion composition according to claim 1, which is a composition comprising 30 to 10 parts by weight. 9. The aqueous dispersion according to claim 1, wherein the aqueous dispersion of the polyolefin composition is an aqueous dispersion in which the polyolefin is in a molten state, contains a basic substance, and is produced in water at a temperature higher than the melting point of the polyolefin composition. liquid composition. 10. The aqueous dispersion according to claim 9, wherein the aqueous dispersion of the polyolefin composition is an aqueous dispersion prepared in water containing a basic substance in an amount of 0.2 chemical equivalent or more relative to the carboxylic acid group in the polyolefin composition. Dispersion composition. 11. The aqueous dispersion composition according to claim 9, wherein the aqueous dispersion of the polyolefin composition is an aqueous dispersion prepared in surfactant-free water. 12. The aqueous dispersion composition according to claim 1, wherein the ethylene-α/β-ethylenically unsaturated carboxylic acid random copolymer is an ethylene-methacrylic acid copolymer. 13 Neutralization degree of ethylene-α/β-ethylenically unsaturated carboxylic acid random copolymer is 30 to 60%
The aqueous dispersion composition according to claim 1. 14 Claims in which the weight ratio of the solid content of the aqueous dispersion (A) and the aqueous dispersion (B) is 95 to 70% by weight and 5 to 30% by weight, respectively, based on the weight of the total solids of the composition. The aqueous dispersion composition according to item 1.