JP3503262B2 - Deodorizing filter and method for producing deodorizing filter - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention has a wide range of synergistic effects by mutually adhering a particulate deodorant and an inorganic porous particle on which a catalytic substance having a deodorizing performance is processed to be attached to a filter material. Since it is possible to add deodorizing performance to odors, it can be widely applied as a deodorizing filter for air purifiers, air conditioners, refrigerators, toilet deodorizers, etc.

[0002]

2. Description of the Related Art In the prior art, the catalyst material having a deodorizing performance was used by directly coating a surface of an inorganic material and forming it into a honeycomb shape, which was directly used as a deodorizing filter material. However, when considering the deodorizing performance at room temperature, these catalytic substances depended on their chemical deodorizing action, so the odors that can be deodorized are limited to a very limited range such as sulfur-based and nitrogen-based compounds. Was there. As a deodorizing filter material at room temperature such as so-called air purifiers, the use of the catalytic substance alone was limited to the odors that can be easily deodorized chemically such as acidic gas and basic gas, so the purpose was to purify the indoor air. In the above application, various odors such as cigarette odors exist in a complex odor state, and thus there is practically no effect.

As a deodorizing filter material in the prior art that combines a chemical deodorizing action and a physical deodorizing action, a method of stacking two layers of these two types of deodorizing filter substances has been considered, but inevitably deodorizing Since the thickness of the filter material tends to become thick and the ventilation resistance tends to become high, it cannot be applied to applications such as air conditioners that are thin and require low pressure loss. Further, a method of directly impregnating a chemical adsorbent having a chemical deodorizing effect on a porous adsorbent by a physical deodorizing effect such as activated carbon could be within the scope of the conventional technique, but in this method, a physical adsorbent having a porous adsorbent is used. Since the deodorizing performance is lowered by directly impregnating the chemicals, the original physical deodorizing performance could not be sufficiently exhibited. Further, this method has a safety problem because the drug is dissolved during use.

[0004]

The present invention has been made by paying attention to such conventional problems, and as a result of intensive studies, in order to solve these problems, air conditioners such as air conditioners having a low profile and low The deodorizing filter according to any one of claims 1 to 4, wherein a chemical deodorizing agent such as a catalyst substance and a physical deodorizing agent such as activated carbon are integrally processed to add deodorizing performance to a wide range of odors even in applications requiring pressure loss. In order to provide wood, we have found a solution to the following problems. Deodorizing filter-Selection of the most suitable inorganic porous particles for supporting the catalytic substance so that the catalytic substance does not easily elute during processing and handling. Optimal use ratio of chemical deodorants such as catalyst substances and physical deodorants such as activated carbon and the method of commercializing them.

[0005]

As means of the present invention,
A catalyst substance having deodorizing performance is dispersed in water at a ratio of 100: 1 to 100: 10 (parts by weight) in 10 to 300 mesh of inorganic porous particles such as zeolite, alumina, and an inorganic chemical deodorant, After soaking, centrifugation or vacuum suction filtration is repeated for dehydration and washing to treat the catalyst substance so that it is not easily dissolved in water.
The method for producing a deodorizing filter according to claims 5 to 11 was devised as a specific measure for simultaneously adhering the catalyst substance-supporting inorganic porous particles and the particulate deodorizing agent obtained by these treatments to the filter base material.

That is, in the method for producing a deodorizing filter according to claim 5 , the binder: catalyst substance-supporting inorganic porous particle body is 10: 1 to 1:10 in a binder in a dry residual amount ratio, and is appropriately adjusted according to the purpose. By adding and dispersing a catalyst substance-supporting inorganic porous particle-containing binder, impregnating the filter base material, and subjecting it to a drying process, a method of post-adhering the particulate deodorant using the tack force of the binder is there. When preparing a binder containing a catalyst substance-supporting inorganic porous particle body, if the catalyst substance-supporting inorganic particle body is in excess of the binder resin content (1:10 or more), powder will fall off much in the final product stage, It is not preferable because a problem occurs during commercialization, and if it is too small (10: 1 or less), the desired deodorizing performance cannot be obtained, so it is necessary to pay attention to this point when designing. Therefore, as the optimum blending ratio according to the method of claim 5 , it is clear that the optimum blending ratio of binder resin: catalyst substance-supporting inorganic porous particle body is 10: 2.5 in terms of dry weight. Became. The results, that is, Examples for the deodorizing performance of the deodorizing filter and the powder falling property of the activated carbon are shown in Table 5 (Examples 5 to 7,
Comparative example 2). The state of the filter at this time is shown in FIG. 3 as a copy diagram.

[0007] In the present invention, the amount of the catalyst substance-supporting inorganic porous particles is too small relative to the binder resin content in view of the blending ratio, so there is a concern that the deodorizing performance will be affected.
As shown in the results of Table 5, by attaching the particulate deodorant such as activated carbon together, the synergistic effect improves the deodorizing performance for nitrogen compounds and sulfur compounds having a low deodorizing level with the deodorizing agent such as activated carbon. I can do things.

As an inorganic porous particle body for supporting a catalyst substance, a relatively large amount of catalyst substance can be supported by using an adsorbent having a porous structure such as zeolite or alumina as a base material. Since it can be produced and the catalyst substance is less likely to be eluted, it is excellent in safety during the manufacturing process and handling after commercialization.

According to a sixth aspect of the present invention, there is provided a method for producing a deodorizing filter, wherein a filter base material is impregnated with a binder in advance, dried, and then mixed at an arbitrary ratio to form a catalyst substance-supporting inorganic porous particle body and a particulate deodorant. This is a method in which the agents are attached together by post-adhesion, and as can be seen from the experimental results in Table 6, it has a feature that a deodorizing filter suitable for the purpose can be provided by adjusting the mixing ratio to an arbitrary ratio. Examples of the deodorizing performance of the deodorizing filter with respect to the compounding ratio of the catalyst substance-supporting inorganic porous particle and the particulate deodorizing agent are shown in Table 6 (Examples 8 to 10 and Comparative Example 3). Further, FIG. 4 shows a copy of the state in which the catalyst substance-supporting inorganic porous particles and the particulate deodorant are attached to the filter at this time.

In the method for producing a deodorizing filter according to a seventh aspect, a mixture of a catalyst substance-supporting inorganic porous particle and a particulate deodorizing agent is dispersed in arbitrary water and then kneaded with a latex to form a slurry. After that, the filter base material is impregnated in the slurry and dried. The deodorizing filter thus obtained is inferior in deodorizing performance to the deodorizing filter obtained by the manufacturing method according to claims 5 and 6.
Like the deodorizing filter obtained by the manufacturing method described,
By adjusting the mixing ratio of the catalyst substance-supporting inorganic porous particles and the particulate deodorizing agent to an arbitrary ratio, it is possible to provide a deodorizing filter with a low pressure loss according to the purpose. Examples of the deodorizing performance of the deodorizing filter are shown in Table 7 (Examples 11 to 13 and Comparative Example 4). Further, FIG. 5 shows a copy of the state in which both particles are attached to the filter at this time.

[0011]

[Function] By using the catalyst substance adhered to the inside and surface of the pores of the porous inorganic porous material, it is excellent in safety during manufacturing and handling after commercialization. It is possible to use an organic filter base material such as polyurethane foam having a good three-dimensional network structure. In addition, a synergistic deodorizing effect can be obtained by simultaneously attaching the catalyst substance-supporting inorganic porous particle and the particulate deodorant. In particular, by using a polyurethane foam with a three-dimensional reticulated structure as the base material of the filter, it is possible to bring out the deodorizing efficiency to the maximum because it is possible to contact with odors with a relatively low pressure loss and multiple orders. You can do it. The deodorizing filter obtained according to claims 3 to 4 can be designed as a deodorizing filter according to the purpose.

[0012]

The present invention will be described in more detail below.

[Examples 1 to 4 and Comparative Example 1] Examples 1 to 4
Also, Comparative Example 1 relates to an experiment for selecting an optimum inorganic porous particle body for supporting and processing the inorganic porous particle body according to claim 6 of the present invention on a catalyst substance having deodorizing performance. As an inorganic particle, a natural zeolite having an average particle size of 4.7 μm (C manufactured by Nitto Koka Kogyo Co., Ltd.)
SP-600) was used as the catalyst, and a commercially available manganese oxide-based catalyst slurry (solid content 43%) [manufactured by Cult Co., Ltd.] which is relatively inexpensive and exhibits a good oxidation catalytic action was used.

As the catalyst having deodorizing performance, various catalysts such as an oxidation catalyst, a reduction catalyst and a photoexcited catalyst can be used.

As a method for supporting the catalyst on the inorganic particles of Examples 1 to 4, the dipping method was used. First, 64.6 wt% of water in the compounding system with the total amount as 100,
Add 3 wt% of manganese oxide-based slurry, 0.1 wt% of sludge stabilizer, and 32.3 wt% of natural zeolite and hold for 1 hr. Or more while stirring. Then 1500r
Centrifuge at a low speed of about pm × 5 min for a short time, discard the upper solution, stir again while adding water, and repeat centrifugation until the upper solution becomes almost transparent. After that, only the chocolate-colored upper layer of the sediment is scraped off, and the lower layer of gray-colored manganese oxide catalyst-supporting zeolite is dried and pulverized. The manganese oxide-based catalyst-supported zeolite obtained by the above treatment does not easily flow out of the manganese oxide-based catalyst even when redispersed in water,
It has the advantage that it can be manufactured and processed safely. Comparative Example 1 shows the state before supporting the manganese oxide-based catalyst in Example 1 in which the supported amount of the manganese oxide-based catalyst is the largest among the above Examples.

The inorganic porous particle body used as the carrier is not particularly limited except that the average particle is 2500 to 1.0 μm, but in the present example, the reason for using natural zeolite as the carrier is as shown in examples 1 to 4, other various inorganic porous system results in loading of measurement in the similar X-ray fluorescence of the resulting manganese oxide-based catalyst carrying article by a method in a particle body, other than Table 1 This is because the amount of the particles is larger than those of various inorganic porous particles, and the manufacturing process is good and the cost is low. Also, Table 2
In the confirmation evaluation of the deodorizing performance at room temperature and at 200 ° C. in Example 4, the type described in Example 1 also showed good deodorizing performance and catalytic performance against the three characteristic odors of benzene, trimethylamine and methyl mercaptan. The catalyst performance was evaluated based on the deodorizing performance at the time of heating at 200 ° C. and the carbon dioxide generation concentration.

As an experimental method, the evaluation tube shown in FIG. 1 was used as an indicator of deodorizing performance and catalytic reaction at room temperature and 200 ° C. for each of the three odors of benzene, methyl mercaptan, and trimethylamine by the detection tube method by aeration method. The amount of carbon dioxide generated was measured. The standard gas generation method is Gas Tech Co., Ltd. permical permeator (PB-1B).
Used, benzene 100ppm, trimethylamine 10p
It was adjusted to pm and 12 ppm of methyl mercaptan. The carrier gas used at this time is 20% oxygen and 80% nitrogen.
The mixed gas of was used to adjust the flow rate of the generated gas to 1 L / min. All samples are 0.5g, inner diameter 30φ, length 220mm
The glass column was set at approximately the center. The inside of the column was filled with non-adsorbing glass wool, and glass filter paper with no adsorbing action was set above and below the sample to prevent the sample from moving up and down. Heat-resistant stoppers were set on the upper and lower sides of the glass column, and a glass 3-way cock was attached.

For the evaluation during heating, a pipe heater was attached to the surface of a glass column and the temperature was controlled to 200 ° C. by a temperature control unit. The gas concentration is measured by switching the three-way cocks set on the top and bottom of the glass column.
21), trimethylamine (NO.180), methyl mercaptan (N
O.71) In order to confirm the catalytic action, carbon dioxide (NO.2L
The detector tube of L) was used. Figure 1 shows the measurement of gas concentration during heating.
Like the above, the gas was cooled to room temperature so that the detector tube would not be affected by heat.

[Examples 5 to 7 and Comparative Example 2] Examples 5 to 7
Is a deodorizing filter according to claim 2 of the present invention, and the catalyst substance-supporting natural zeolite of Example 1 and Y-60C coconut shell activated carbon manufactured by Hokuetsu Carbon Co., Ltd. were used as the particulate deodorizing agent. As the filter base material, Everstone SF made by Bridgestone Corporation, cell 10 PPI, 250 mm x
250 mm in thickness and 5 t in thickness, and as a mixing binder, acrylic emulsion (water-based) product number E-1054-6 manufactured by Souken Kagaku Co., Ltd. was used. The number of cells P
PI represents the number of cells (holes) on a 1-inch straight line.
First, the catalyst substance-supporting natural zeolite of Example 1 was added to the binder at a ratio shown in Table 5, and the mixed binder was impregnated so as to be 30 g / m ² dry with respect to the filter material.
It was dried. Next, Y-60C coconut shell activated carbon was post-deposited in a dry state by utilizing the tack force of this mixed binder. In Comparative Example 2, the catalyst substance-supporting natural zeolite was not added to the binder, and only activated carbon was simply attached in a dry state.

As the evaluation method, the evaluation tester shown in FIG. 2 was used, the column diameter was 20φ, a glass tube having a length of 220 mm was used, and the sample was set at substantially the center of the column. The gas generation method and the gas detection method were in accordance with the method of [Example 1]. However, the evaluation was conducted only at room temperature, and the carbon dioxide generation concentration was not confirmed. This is for Examples 1-4
-Comparative Example 1-As can be seen from the experimental results in Tables 2 to 4, the catalyst substance acts as a chemical deodorant at room temperature, and therefore the evaluation of the catalyst performance itself has no meaning. For the evaluation of the powder falling property, prepare a white thick paper (105 mm x 150 mm) with a double-sided tape stuck on the entire surface on one side, 5 ^t x 80 mm
A sample cut to × 110 mm is set in the center of the pressure-sensitive adhesive sheet plate, and a thick paper (105 mm × 1
50 mm) and 0.8 ^t x 25 mm from the top of the cardboard
× 300mm (40-50g) iron plate parallel to the entire surface 4
I tapped it 8 times. After the completion of the tataki, the sample was removed and the amount of activated carbon adhering to the surface of the adhesive tape was used as the degree of powder removal to visually compare [Examples 5 to 7 and Comparative Example 2] with each other.

From Table 5, it was confirmed that the deodorizing performance of trimethylamine and methyl mercaptan tended to improve as the ratio of the catalyst substance-supporting natural zeolite of Example 1 added to the binder resin component increased. However, at the same time, since the tackiness of the binder decreases, the amount of the activated carbon deposited due to post-adhesion gradually decreases, and as shown in Example 7, the activated carbon powder falls off noticeably. The ratio of the added amount of Example 1 to the resin component was 10:
It has been found that about 2.5 is optimal.

The deodorizing filter according to the second aspect of the present invention can have a very large amount of activated carbon deposited per unit volume, and when used in combination with a catalyst substance, the adsorption performance of nitrogen compounds and sulfur compounds can be improved. Due to the synergistic effect, it can be increased with a relatively small amount of catalyst substance used. Therefore, it has a very excellent deodorizing performance in that it physically enhances the deodorizing performance to the maximum and further safely covers a wide range of odors such as nitrogen compounds and sulfur compounds. Furthermore, the pressure loss and the deodorizing performance can be arbitrarily adjusted by controlling the cell number and thickness of the filter base material and the particle size of the particulate deodorant.

[Examples 8 to 10 and Comparative Example 3] Examples 8 to
10 is the deodorizing filter according to claim 3, and the filter base material is Everlight S manufactured by Bridgestone Corporation.
F, cell 10 PPI, thickness 5 ^t was used, and as the binder, acrylic emulsion (water-based) product number E-1054-6 manufactured by Souken Chemical Co., Ltd. was used. Examples of the inorganic porous particles supporting the catalyst substance include Nitto Koka Kogyo Co., Ltd.
The ZO2 natural zeolite manufactured was used after sieving into 25 mesh, which is the same mesh as the activated carbon described below.

The catalyst substance was loaded in the same manner as in Example 1, and a manganese oxide-based catalyst manufactured by Cult Co., Ltd. was loaded as the catalyst substance. Further, as a particulate deodorant to be mixed with the catalyst substance-supporting natural zeolite at an arbitrary ratio, Y-20 / 32 coconut shell activated carbon manufactured by Hokuetsu Carbon Co., Ltd. was used. First, the binder is 40% on the filter base material.
g / m ² impregnated and dried so as to be a dry, adhering processing the catalyst substance-supporting natural zeolite and activated carbon were thoroughly premixed in proportions shown in Table 6 so as to be 1300 g / m ² in a dry state. As the evaluation method of the deodorizing filter, the same method as in Example 1 was used. Comparative Example 3 shows a case where only activated carbon is attached.

From Table 6, the deodorizing performance of trimethylamine and methyl mercaptan is improved as the mixing ratio of the catalyst-supporting natural zeolite is increased, but at the same time, the mixing ratio of activated carbon is lowered, so that a gas component depending on physical adsorption such as benzene. On the contrary, it tends to decrease. Therefore, there is a feature that a deodorizing filter suitable for the purpose can be provided by mixing the above-mentioned particles in an arbitrary ratio. It is desirable to increase the mixing ratio of the catalyst substance-supported natural zeolite to deal with so-called toilet odors and refrigerator odor deodorization, which are mainly used for nitrogen compounds and sulfur compounds. In addition, it is desirable to increase the mixing ratio of activated carbon to cope with applications that need to cover a wide range of odors such as air purifiers. Further, the pressure loss and the deodorizing performance can be arbitrarily adjusted by controlling the cell number and thickness of the filter-base material and the particle size of the particulate deodorant and the catalyst substance-supporting particulate deodorant.

[Examples 11 to 13 and Comparative Example 4] Example 1
1 to 13 and Comparative Example 4 are the deodorizing filters according to claim 4, and as the filter base material, Everstone SF manufactured by Bridgestone Corporation, cell 10PPI, 250 mm × 25
A thickness of 0 mm and a thickness of 5 ^t was used. First, the catalyst substance-supporting natural zeolite described in Example 1 and palm shell activated carbon Y-300C manufactured by Hokuetsu Carbon Industry Co., Ltd. were mixed at a ratio shown in Table 7 and dispersed in water, and then acrylic resin manufactured by Nippon Synthetic Rubber Co., Ltd. This was kneaded with the system latex AE-932 to prepare a slurry having a solid content of 45%. At this time, the mixing ratio of the latex and the catalyst substance-supporting natural zeolite was 5 (mixed powder): 1 (latex) based on the dry weight. In addition, Comparative Example 4 shows the case where only activated carbon is used.

As shown in Table 7, the deodorizing performance of trimethylamine and methyl mercaptan improves as the mixing ratio of the catalyst-supporting natural zeolite increases, but at the same time, the mixing ratio of activated carbon decreases, so that a gas dependent on physical adsorption such as benzene. On the contrary, the composition tends to decrease. Therefore, similar to the deodorizing filter according to the third aspect, there is a feature that a deodorizing filter suitable for the purpose can be provided with a low pressure loss by mixing the catalyst substance-supporting natural zeolite and the activated carbon in an arbitrary mixing ratio.

[0028]

The deodorizing filter obtained by the method for producing a deodorizing filter according to claim 5 adheres to a particulate deodorizing agent and a catalyst substance-supporting inorganic porous particle body in combination, so that a wide range of odors can be obtained due to their synergistic effect. It is possible to provide a deodorizing filter having excellent deodorizing performance. The deodorizing filter obtained by the method for producing a deodorizing filter according to claim 6 provides a deodorizing filter according to the application by arbitrarily changing the mixing ratio of the particulate deodorizing agent and the catalyst substance-supporting inorganic porous particle. Can be done. 7. deodorizing filter obtained by the production method of deodorizing filter according the pressure loss of the deodorizing performance compared to deodorizing filter obtained by the production method of deodorizing filter according to claim 5 and claim 6, wherein for a impregnation type is inferior ones For very severe applications, the pressure drop is low and the mixing ratio of the particulate deodorant and the catalyst substance-supporting inorganic porous particle is arbitrarily changed as in the deodorizing filter obtained by the method for producing a deodorizing filter according to claim 6. By doing so, it is possible to provide a deodorizing filter according to the application.

[0029]

[Table 1]

[Table 2]

[Table 3]

[Table 4]

[Table 5]

[Table 6]

[Table 7]

[Brief description of drawings]

FIG. 1 is a graph showing the deodorizing performance of a catalyst substance having the deodorizing performance according to claims 1 to 4 , which is actually measured at room temperature and at 200 to evaluate the optimum product of the processed product when supporting and processing the inorganic porous particle body. 1 is a schematic diagram of an evaluation tester for carrying out heating at ℃.

FIG. 2 is a schematic diagram of an evaluation tester for measuring the deodorizing performance of the deodorizing filter according to claims 1 to 4 at room temperature.

FIG. 3 is a schematic view of a deodorizing filter according to Examples 5 to 7 according to claim 5 .

FIG. 4 is a schematic view of a deodorizing filter according to Examples 8 to 10 according to claim 6 .

5 is a schematic representation regarding the deodorizing filter according Examples 11-13 based on claim 7.

Claims (11)

(57) [Claims] 1. A particulate deodorant and (2) an inorganic porous particle having a catalytic substance having a deodorizing property supported and processed thereon, and attached to a filter material with a binder (1) and ( A deodorizing filter characterized by being attached together with 2). 2. The average particle diameter of the particulate deodorant (1) is 1
0 to 300 mesh (2500 to 85 μm), and the average particle diameter of the inorganic porous particle body is 2500 to 1.0 μm.
The deodorizing filter according to claim 1, which is m. 3. The inorganic porous particle body is zeolite or alumina having a porous structure, and the catalytic substance having deodorizing performance is a manganese oxide type catalyst.
Alternatively, the deodorizing filter according to item 2. 4. A polyurethane foam said filter material having a three-dimensional network skeleton structure, the resin net member, or a nonwoven fabric, the deodorizing filter according to claim 1, wherein said binder is a water-based emulsion. 5. (1) A particulate deodorant and (2) an inorganic porous particulate material on which a catalytic substance having deodorizing performance is supported and processed, and the resulting material is attached to a filter material using a binder,
A method for producing a deodorizing filter in which (1) and (2) are adhered together, wherein (2) an inorganic porous particle body on which a catalytic substance having deodorizing performance is carried and processed is added and dispersed in a binder. After that, the filter material is impregnated and dried, and the tackiness of this binder is used to further attach the particulate deodorant to the filter material later, and the particulate deodorant comes into contact and adheres to the surface and inside of the filter material. A method for producing a deodorizing filter, characterized in that the rest is exposed. 6. A (1) particulate deodorant and (2) an inorganic porous particulate material on which a catalytic substance having deodorizing performance is supported and processed, and the resulting material is attached to a filter material using a binder,
A method for producing a deodorizing filter in which (1) and (2) are adhered in combination, wherein a filter material is impregnated with a binder in advance and dried to obtain a particulate deodorizing agent and an inorganic porous particle body having a deodorizing performance. A method for producing a deodorizing filter, characterized in that the catalyst-supported processed product is brought into contact with and adhered to the surface and the inside of the filter material after the support-processed product is attached, and the remainder is exposed. 7. (1) A particulate deodorant and (2) an inorganic porous particle on which a catalytic substance having deodorizing performance is supported and processed, and the resulting substance is attached to a filter material using a binder,
A method for producing a deodorizing filter in which (1) and (2) are adhered together, wherein a mixture of a particulate deodorant and an inorganic porous particulate material on which a catalytic substance having deodorizing performance is processed. A method for producing a deodorizing filter, which comprises adding and dispersing into a filter material, and then impregnating and drying the filter material. 8. The average particle diameter of the particulate deodorant (1) is 1
0 to 300 mesh (2500 to 85 μm), and the average particle diameter of the inorganic porous particle body is 2500 to 1.0 μm.
The method for producing a deodorizing filter according to claim 5, 6 or 7, wherein m is m. 9. The (2) inorganic porous particle body prepared by supporting and processing a catalyst substance having a deodorizing property, wherein the inorganic porous particle body is provided with a catalyst substance having a deodorizing property.
Disperse in water at a ratio of 0: 1 to 100: 10 (parts by weight), sufficiently immerse it, and then repeat dehydration and washing by centrifugation or vacuum suction filtration so that the catalyst substance can be easily dissolved in water. of those subjected to treatment to claims 5
9. The method for manufacturing a deodorizing filter according to any one of items 8 to 8 . 10. The inorganic porous particle body is zeolite or alumina having a porous structure, and the catalytic substance having deodorizing performance is a manganese oxide type catalyst.
The method for producing a deodorizing filter according to any one of 5 to 9 . 11. A polyurethane foam said filter material having a three-dimensional network skeleton structure, the resin net member, or a nonwoven fabric, the deodorizing filter according to any one of claims 5 to 10 wherein the binder is an aqueous emulsion Manufacturing method.