JPH0788284B2 - Stable pesticide composition - Google Patents

Description

FIELD OF THE INVENTION The present invention relates to stable pesticide compositions.

Conventional technology General formula [In the formula, R ₁ and R ₂ are the same or different and are C _{1 to} C ₈ alkyl groups,
A-(C ₁ -C ₆ alkylene) COOR ₃ group or a -COOR ₄ group is shown.
Here, R ₃ and R ₄ represent a C _{1 to} C ₈ alkyl group. It is known that the sulfenylcarbamate derivative represented by the following formula has an excellent effect against various pests and has a broad insecticidal spectrum, while having low toxicity to warm-blooded animals. Therefore, the sulfenylcarbamate derivative represented by the above general formula (I) is being marketed or developed as a useful insecticide component. However, the above-mentioned sulfenylcarbamate derivatives are sometimes unstable and can decompose significantly, especially when formulated into powder or granules depending on the type of mineral carrier normally used.

In order to provide an inexpensive and effective insecticide, it has been desired to develop a technique capable of suppressing the decomposition of the sulfenylcarbamate derivative even if any mineral substance carrier is added, and various studies have been conventionally conducted. Has been done, but not enough results have been achieved yet.

Means for Solving Problems The present inventor has conducted diligent research in order to develop a stable insecticide composition in view of the present situation, and as a result, the sulfenylcarbamate derivative represented by the above general formula (I) was obtained. It has been found that the intended purpose of the present invention can be achieved by adding an alkali metal carbonate to the insecticidal preparation, and the present invention has been completed here.

That is, the present invention relates to a stable insecticide composition, which comprises adding an alkali metal carbonate to an insecticide formulation of the sulfenylcarbamate derivative represented by the general formula (I).

In the present invention, the insecticide formulation means a formulation form such as granules, fine granules, wettable powders and powders containing an insecticidal active ingredient, and a carrier used for this is usually used for insecticide formulations. One or two types of mineral carriers such as bentonite, diatomaceous earth, white carbon, clay, talc, etc.
It may be a mixture of two or more kinds, or a powder of these may be granulated with a binder, a surfactant, water or the like.

As the sulfenylcarbamate derivative of the general formula (I) contained in the insecticidal preparation of the present invention, any conventionally known compound can be used as long as it is included in the above general formula, and specifically, the following compounds Can be illustrated.

2,3-Dihydro-2,2-dimethyl-7-benzofuranyl N- [N- (2-ethoxycarbonylethyl) -N-
Isopropylaminosulfenyl] -N-methylcarbamate (hereinafter referred to as "Compound 1") 2,3-dihydro-2,2-dimethyl-7-benzofuranyl N- (N, N-dibutylaminosulfenyl) -N- Methyl carbamate (hereinafter referred to as "compound 2") [(2,3-dihydro-2,2-dimethylbenzofuranyl-
7-oxy)-(N-methylamino) carbonyl]-
[N-butoxy- (N'-methylamino) carbonyl]
Sulfaide (hereinafter referred to as "Compound 3") The amount of the sulfenylcarbamate derivative of the above-mentioned general formula (I) contained in the insecticidal preparation of the present invention is not particularly limited and may be appropriately selected from a wide range. Usually, it is about 0.5 to 60% by weight, preferably about 2 to 50% by weight in the preparation.

Examples of the alkali metal carbonate used in the present invention include sodium carbonate, potassium carbonate and the like. These alkali metal carbonates are industrially easily available compounds. The amount of the alkali metal carbonate compounded is not particularly limited, but is usually about 0.005 to 10% by weight, preferably 0.1 to 5% by weight in the insecticidal preparation of the present invention.
It is recommended to add about wt%.

In the present invention, other stabilizers, for example, epoxidized compounds, amines and the like, which are known as stabilizers of the sulfenylcarbamate derivative of the above-mentioned general formula (I), are added together with the alkali metal carbonate to give the present invention. The desired effect can be further expressed.

Effects of the Invention By incorporating an alkali metal carbonate into the insecticidal preparation of the sulfenylcarbamate derivative represented by the general formula (I),
The stability of the formulation can be significantly improved.

Examples The present invention will be further clarified with reference to the following examples.

Example 1 (powder) Compound 1, Compound 2 or Compound 3 2 g, sodium carbonate
0.1 g of clay powder, 94 g of clay powder [manufactured by Kunimi Kogyo Co., Ltd.] and 3.9 g of Carplex 80 [manufactured by Shionogi Pharmaceutical Co., Ltd.] were mixed and ground by a hammer mill to obtain a 2% powder.

The powder was placed in a glass bottle, stoppered and stored at 40 ° C. for 1 month, and then the content of the active ingredient compound in the powder was analyzed by high performance liquid chromatography analysis to determine the decomposition rate with respect to the initial content.

For comparison, a dust was obtained in the same manner as above except that sodium carbonate was not added, and the decomposition rate was determined.

The results are shown in Table 1 below.

Example 2 (Granule) Alkali metal carbonate, clay powder [Kunimi Kogyo Co., Ltd.]
Kuraray Poval 205 [Kuraray Co., Ltd.] in a mixture of talc GTA [Kunimie Industry Co., Ltd.] and bentonite [Toyoshun Mining Co., Ltd.] in the proportions shown in Table 2 below.
3 g and 15 g of water were added and kneaded, and granulated with an EXK pelletizer [manufactured by Fuji Powell] equipped with a 0.7 mmφ screen. The obtained granules were dried with a fluid dryer to obtain a granular carrier. Compound (15 g) was spray-mixed with 95 g of the granular carrier to obtain 5% granules.

The granules were placed in a glass bottle, stoppered and stored at 40 ° C. for 1 month, and then the content of compound 1 in the granules was analyzed by high performance liquid chromatography analysis to determine the decomposition rate with respect to the initial content. The results are shown in Table 2.

Example 3 (wettable powder) Compound 1 21 g, Carplex 80 [Shionogi Pharmaceutical Co., Ltd.]
28 g, Kunilite 201 [Kunimi Industry Co., Ltd.] 48
g, sodium carbonate 1 g, Agrisol W160 [manufactured by Kao Soap Co., Ltd.] 1 g and Neoperex NO.6F [manufactured by Kao Soap Co., Ltd.] 1 g, and then pulverized with a jet mill [manufactured by Seishin Enterprise Co., Ltd.] 20% wettable powder was obtained.

This wettable powder was placed in a glass bottle, stoppered, and stored at 40 ° C. for 1 month, and then the content of Compound 1 in the wettable powder was analyzed by high performance liquid chromatography analysis to determine the decomposition rate with respect to the initial content. .

Kunilite 20 without sodium carbonate for comparison
A wettable powder was obtained in the same manner as above except that the compounding amount of 1 was increased, and the decomposition rate was obtained.

The results are shown in Table 3 below.

Claims (4)

[Claims] 1. A general formula [In the formula, R ₁ and R ₂ are the same or different and each represents a C ₁ -C ₈ alkyl group, a-(C ₁ -C ₆ alkylene) COOR ₃ group or a -COOR ₄ group.
Here, R ₃ and R ₄ represent a C _{1 to} C ₈ alkyl group. ] The stable insecticide composition characterized by mix | blending an alkali metal carbonate with the insecticide formulation of the sulfenyl carbamate derivative represented by these. 2. The composition according to claim 1, wherein R ₁ is an isopropyl group and R ₂ is an ethoxycarbonylethyl group. 3. The composition according to claim _1, wherein R ₁ and R ₂ are both n-butyl groups. 4. The composition according to claim 1, wherein R ₁ is a methyl group and R ₂ is a butoxycarbonyl group.