JPH0769806A - Water-based agrochemical composition - Google Patents

Abstract

PURPOSE:To obtain a water-based agrochemical composition low in odor and in fear of flashing, high in safety for its users, comprising ethofenprox, a compound such as phenyl xylylethane and a surfactant. CONSTITUTION:This composition comprises ethofenprox, i.e., 2-(4- ethoxyphenyl)-2-methylpropyl-3-phenoxybenzyl ether, a compound of the formula (X is a lower alkyl or an aralkyl; (n) is 0 or 1-4) (esp. pref. phenyl xylylethane) and a surfactant (pref. a nonionic surfactant having a polyoxyalkylene chain or an anionic surfactant having sulfo group, esp. polyoxyethylene tristyrylphenyl ether or calcium dodecylbenzenesulfonate). This composition exhibits excellent insecticidal activity, is free from odor or danger due to solvent. The composition is also safe in domestic horticultural use because of its no crystallization in cold state and giving stable efficacy.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an agrochemical composition having an insecticidal action, which is used in the cultivation of fruit trees, vegetables, flowering trees, ornamental plants and the like.

[0002]

2. Description of the Related Art 2- (4-Ethoxyphenyl) -2-methylpropyl 3-phenoxybenzyl ether (generic name: etofenprox) is known as a low-toxic insecticide for fruit tree and vegetable cultivation (Soft Science). The latest pesticide data book published by the company, 1989 edition). Further, the compound represented by the above formula (I) is known as an additive in the field of agrochemicals (JP-A-62-167702). Furthermore, surfactants can also be used as agricultural and horticultural agents.

However, a low toxicity aqueous pesticidal composition for home gardening, which is a combination of these, has not yet been known.

[0004]

As a liquid preparation conventionally used for home gardening, a liquid pesticide (pesticide active ingredient) is dissolved in an organic solvent, and a surfactant is added to prepare a liquid preparation. Many emulsions are made to be emulsions when diluted to a spray concentration, but since this formulation contains a large amount of organic solvents such as xylene, it is a dangerous substance under the Fire Service Law and has a peculiar odor. There was a lack of safety for plants and livestock. An object of the present invention is to provide a pesticide composition having low toxicity for home gardening.

[0005]

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present inventors have conducted various studies and as a result, as a result, an aqueous pesticide containing etofenprox, a compound represented by the formula (I) and a surfactant. The composition was found to be a dosage form with low odor, low risk of ignition and high safety for the user, and further research based on this was completed, and as a result, the present invention was completed.

The present invention is directed to etofenprox, formula (I)

[Chemical 2] [In the formula, X is a lower alkyl group or an aralkyl group, and n is 0 or an integer of 1 to 4], and an aqueous pesticide composition comprising a surfactant.

Etofenprox is 2- (4-ethoxyphenyl) -2-methylpropyl-3-phenoxybenzyl ether and has an insecticidal action. The amount of etofenprox used is preferably about 0.05 to 10% (by weight) based on the entire aqueous composition, and particularly about 0.1 to 10%.
5% (by weight) is preferred.

In the formula (I), the lower alkyl group represented by X is preferably an alkyl group having 1 to 3 carbon atoms, and examples thereof include methyl, ethyl and n-propyl. Of these, methyl and ethyl are preferable, and methyl is particularly preferable. Examples of the aralkyl group include benzyl, phenethyl, α-methylbenzyl and the like.
Of these, α-methylbenzyl is particularly preferable. The most preferred example of the compound of formula (I) is phenylxylylethane.

The amount of the compound (I) used is about 0.3 to 15 times (weight) of etofenprox 1, and more preferably about 0.5 to 10 times.

The surfactant used in the present invention is not particularly limited, and may be a nonionic surfactant or an anionic surfactant. Among them, a nonionic surfactant having a polyoxyalkylene chain or an anionic surfactant having a sulfo group is particularly preferable.

Specific examples of the nonionic surfactant having a polyoxyalkylene chain used in the present invention include polyoxyethylene styryl phenyl ether, polyoxyethylene alkyl ether, polyoxyethylene alkyl phenyl ether and polyoxyethylene fatty acid. Examples thereof include esters and polyoxyethylene polyoxypropylene block polymers, which may be used alone or in combination.

Examples of the polyoxyethylene styryl phenyl ether include polyoxyethylene monostyryl phenyl ether, polyoxyethylene distyryl phenyl ether, and polyoxyethylene tristyryl phenyl ether.

As the polyoxyethylene alkyl ether, polyoxyethylene lauryl ether, polyoxyethylene tridecyl ether, polyoxyethylene oleyl ether, polyoxyethylene cetyl ether, polyoxyethylene stearyl ether, polyoxyethylene hydrogenated castor oil, etc. Is mentioned.

Examples of the polyoxyethylene alkyl phenyl ether include polyoxyethylene octyl phenyl ether, polyoxyethylene nonyl phenyl ether, polyoxyethylene dinonyl phenyl ether and the like.

Examples of the polyoxyethylene fatty acid ester include polyoxyethylene monooleate, polyoxyethylene dioleate, polyoxyethylene monostearate, polyoxyethylene distearate and polyoxyethylene laurate. Is mentioned.

Examples of the polyoxyethylene polyoxypropylene block polymer include polyoxyethylene (5) polyoxypropylene (30) glycol, polyoxyethylene (160) polyoxypropylene (3
Examples thereof include 0) glycol and polyoxyethylene (3) polyoxypropylene (6) lauryl ether.
The number in () indicates the number of moles of polymerization.

The most preferable nonionic surfactant having the polyoxyalkylene chain is polyoxyethylene tristyryl phenyl ether, polyoxyethylene oleyl ether, polyoxyethylene nonyl phenyl ether, polyoxyethylene monooleate. , Polyoxyethylene dioleate, polyoxyethylene (5) polyoxypropylene (30) glycol and the like.

Specific examples of the anionic surfactant having a sulfo group used in the present invention include alkylbenzene sulfonate. The alkyl in the alkylbenzene sulfonate preferably has 8 to 18 carbon atoms, and more preferably 8 to 12 carbon atoms. Examples of the alkyl include dodecyl, 2-ethylhexyl, decyl, nonyl, octyl and the like,
Among them, dodecyl is most preferable. Examples of the salt include alkali metal salts (eg, sodium salt, potassium salt), alkaline earth metal salts (eg, calcium salt, magnesium salt) and the like.

Specific examples of the alkylbenzene sulfonic acid include sodium dodecyl benzene sulfonate, calcium dodecyl benzene sulfonate, sodium octyl benzene sulfonate, and the like, of which calcium dodecyl benzene sulfonate is preferable.

The nonionic surfactant and the anionic surfactant may be used alone or in combination.

The amount of the surfactant used is about 0.5 to 10 times (weight), and more preferably about 1 to 5 times (weight) the amount of etofenprox 1, and the entire aqueous composition. Approximately 0.05 to 25% (weight) is preferable, and particularly approximately 0.1 to 20% (weight) is preferable. When both the nonionic surfactant and the anionic surfactant are used, the ratio of both is preferably about 1: 0.2 to 1 times (weight), and further about 1: 0.4. Particularly preferably, the amount is about 0.6 times (weight).

Further, if desired, the aqueous composition of the present invention may be a known antiseptic such as sodium benzoate, butylparaben, potassium sorbate, etc., antifreezing agents such as ethylene glycol, isopropanol, methanol, etc., such as silicon compounds. Defoaming agent (for example, defoaming silicone TSA-750 manufactured by Toshiba Silicon Co., Ltd.) may be contained.

The aqueous composition of the present invention can be easily produced by mixing the above components and water by a means known per se. The order of addition of each component may be arbitrary. Furthermore, about 65-90 parts by weight of the aqueous composition thus produced, for example LPG, using means known per se.
The aerosol agent may be produced by filling an aerosol can with about 35 to 10 parts by weight of a propellant such as (liquefied petroleum gas), dimethyl ether or nitrogen gas.

The appropriate amount of application of the composition of the present invention varies depending on the appropriate scene, the timing of application, the method of application, the target pest, the cultivated crop, etc., but the amount of the composition of the present invention at which the insecticidal action is exerted,
The concentration or method of use is appropriately selected. For example,
1 as a pesticide active ingredient (ie etofenprox)
About 10 to 40g per 0 are, preferably 15
To 25 g is suitable. The composition of the present invention may be applied to the foliage of fruit trees (eg, camellia, cherry tree, etc.), flowers (eg, rose, kiku, etc.) and fruit vegetables (eg, tomato, cucumber, etc.). In addition, the composition of the present invention does not cause phytotoxicity to applied crops and other crops, and has low toxicity to human livestock and fish.

The composition of the present invention is an aqueous preparation which does not contain a large amount of an organic solvent like conventional emulsions, has no chemical damage due to a solvent or the like, and has extremely low toxicity to humans and animals.
In addition, it has a feature that crystals of etofenprox do not precipitate when it is cold. Further, the composition of the present invention has the effects of having less odor, less risk of catching fire, and less contamination of houses, appliances and furniture in the case of home gardening.

[0026]

The present invention will be described in more detail with reference to the following examples, but the present invention is not limited thereto. In addition, "part" means a weight part. Further, the polyoxyethylene styryl phenyl ether used in the following examples is a mixture mainly containing a tristyryl body and a monostyryl body and a distyryl body.

Example 1 0.1 part of etofenprox was dissolved in 0.1 part of phenylxylylethane, and then a 55:25 (weight ratio) mixture of polyoxyethylene styryl phenyl ether and calcium dodecylbenzene sulfonate 0.2 was added. Part and 1.75 parts of isopropanol to prepare a liquid I. Purified water 97.5
To 5 parts, 0.1 part of sodium benzoate and 0.2 part of a silicon defoaming agent (defoaming silicon TSA-750 (trade name) manufactured by Toshiba Silicon Co., Ltd.) are added and mixed to prepare a liquid II. Solution I was added while stirring solution II and mixed well to obtain an aqueous pesticide composition. The composition is applied as is.

Example 2 0.1 part of etofenprox was dissolved in 0.1 part of phenylxylylethane, and then a 55:25 (weight ratio) mixture of polyoxyethylene styryl phenyl ether and calcium dodecylbenzene sulfonate was added in a ratio of 0.4. Part and 1.75 parts of isopropanol to prepare a liquid I. Purified water 97.3
To 5 parts, 0.1 part of sodium benzoate and 0.2 part of a silicon defoaming agent (defoaming silicon TSA-750 (trade name) manufactured by Toshiba Silicon Co., Ltd.) are added and mixed to prepare a liquid II. Solution I was added while stirring solution II and mixed well to obtain an aqueous pesticide composition.

Example 3 5 parts of etofenprox was added to phenylxylylethane 3
Parts and 7 parts of isopropanol, and then mixed with 20 parts of a 55:25 (weight ratio) mixture of polyoxyethylene styryl phenyl ether and calcium dodecylbenzene sulfonate to prepare a solution I. To 64.68 parts of purified water, 0.1 part of potassium sorbate, 0.2 parts of a silicon defoaming agent (Toshiba Silicon Co., Ltd. defoaming silicon TSA-750 (trade name)) and 0.02 part of Edible Blue No. 1 were added. Mix to form Solution II. II
Solution I was added while stirring the solution and mixed well to obtain an aqueous pesticide composition. The composition is preferably diluted 250 to 500 times with water and then sprayed.

Example 4 Polyoxyethylene polystyryl phenyl ether sulfate 2 was used instead of 20 parts of a 55:25 (weight ratio) mixture of polyoxyethylene styryl phenyl ether and calcium dodecylbenzene sulfonate in Example 3.
An aqueous pesticide composition was obtained by the same procedure as in Example 3 except that 0 part was used.

Example 5 Polyoxyethylene nonylphenyl ether and sodium dodecylbenzene sulfonate were replaced with 20 parts of a 55:25 (weight ratio) mixture of polyoxyethylene styryl phenyl ether and calcium dodecyl benzene sulfonate in Example 3 instead of 20 parts. 50:50 (weight ratio) mixture 2
An aqueous pesticide composition was obtained by the same procedure as in Example 3 except that 0 part was used.

Example 6 0.1 part of etofenprox was dissolved in 0.85 part of phenylxylylethane, and a mixture of polyoxyethylene styryl phenyl ether and calcium dodecylbenzenesulfonate (55:25 (weight ratio)) was mixed in a ratio of 0.20. Part and 1.75 parts of isopropanol to prepare a liquid I. Purified water 7
Toho Chemical's rust preventive agent Sorpol EX-146 in 8.6 parts
0.5 parts (registered trademark) and 0.20 parts of a silicon defoaming agent (defoaming silicon TSA-750 (trade name) manufactured by Toshiba Silicon Co., Ltd.) are added and mixed to prepare a liquid II. Liquid I and liquid II are mixed to obtain 82.2 parts of an aqueous pesticide composition. This total amount and L
17.8 parts of PG was filled in a dedicated aerosol can to prepare an aerosol agent.

Example 7 0.1 part of etofenprox was dissolved in 0.85 part of phenylxylylethane, and then polyoxyethylene polyoxypropylene block polymer (polyoxyethylene (5) polyoxypropylene (30) glycol; pepol) was used. B-181 (trade name, Toho Chemical Industry Co., Ltd.) and polyoxyethylene fatty acid ester (polyoxyethylene dioleate; Pegnol 24-0 (trade name,
Toho Chemical Industry Co., Ltd.) 1: 1 (weight ratio) mixture 0.
Mix with 30 parts and 1.75 parts of isopropanol to prepare a liquid I. 0.5 parts of anti-corrosion agent Solpol EX-146 (registered trademark) manufactured by Toho Kagaku Co., Ltd. and 0.20 parts of silicon defoaming agent (defoaming silicon TSA-750 (trade name) manufactured by Toshiba Silicon Co.) in 78.5 parts of purified water. Add and mix to form Solution II. Liquid I and
Liquid II is mixed to obtain 82.2 parts of an aqueous pesticide composition. This whole amount and 17.8 parts of LPG were filled in a dedicated aerosol can to prepare an aerosol agent.

Example 8 0.1 part of etofenprox was dissolved in 0.85 part of phenylxylylethane, and polyoxyethylene fatty acid ester (polyoxyethylene monooleate; pegnol 14-0 (trade name, Toho Kagaku Co., Ltd.) Industry Co., Ltd.))
Mix with 0.20 parts and 1.75 parts isopropanol I
Use as liquid. 0.5 parts of anti-corrosion agent Solpol EX-146 (registered trademark) manufactured by Toho Chemical Co., Ltd. and 0.20 parts of silicon defoaming agent (defoaming silicon TSA-750 (trade name) manufactured by Toshiba Silicon Co.) in 78.6 parts of purified water. Add and mix to form Solution II. Liquids I and II are mixed to obtain 82.2 parts of an aqueous pesticide composition. This whole amount and 17.8 parts of LPG were filled in a dedicated aerosol can to prepare an aerosol agent.

Test Example 1 Hazardous substance determination test ("Ministerial Ordinance on Testing and Properties of Dangerous Goods" (1989, No. 1 of the Autonomous Ministry of Agriculture, February 17, 1991) on the aqueous pesticide compositions produced in Examples 1 to 5 Day)
by. As a result, all were "Dangerous goods Class 4 Not applicable". Further, a stability test was carried out by leaving it at −5 ° C. for 7 days, but neither the aqueous pesticide compositions produced in Examples 1 to 5 showed formation of crystals of etofenprox or precipitation. The stock solutions of Examples 6 to 8 (aqueous compositions before the addition of the propellant LPG) were also “hazardous substance class 4 non-applicable”, and no crystal formation or precipitation was observed.

[0036]

EFFECTS OF THE INVENTION The aqueous pesticide composition of the present invention exhibits excellent insecticidal properties, has no odor or danger caused by a solvent, and does not crystallize when cold, so that it can be safely used for home gardening, and , A formulation that provides stable drug efficacy.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display area A01N 27:00)

Claims (8)

[Claims] 1. 2- (4-Ethoxyphenyl) -2-methylpropyl 3-phenoxybenzyl ether of the formula (I): [In the formula, X represents a lower alkyl group or an aralkyl group, and n represents 0 or an integer of 1 to 4], and an aqueous pesticide composition comprising a surfactant. 2. X in the formula (I) is a methyl group.
The aqueous pesticide composition described. 3. The aqueous pesticide composition according to claim 2, wherein the compound represented by the formula (I) is phenylxylylethane. 4. The aqueous pesticide composition according to claim 1, wherein the surfactant is a nonionic surfactant having a polyoxyalkylene chain or an anionic surfactant having a sulfo group. 5. The nonionic surfactant having a polyoxyalkylene chain is polyoxyethylene styryl phenyl ether, polyoxyethylene alkyl ether, polyoxyethylene alkyl phenyl ether, polyoxyethylene fatty acid ester and polyoxyethylene polyoxypropylene block polymer. The aqueous pesticide composition according to claim 4, which is one kind or a mixture of two or more kinds selected from the following. 6. A nonionic surfactant having a polyoxyalkylene chain is polyoxyethylene tristyryl phenyl ether, polyoxyethylene oleyl ether, polyoxyethylene nonyl phenyl ether, polyoxyethylene monooleate, polyoxyethylene diolein. The aqueous pesticide composition according to claim 4, which is one kind or a mixture of two or more kinds of acid ester and polyoxyethylene polyoxypropylene glycol. 7. The aqueous pesticide composition according to claim 4, wherein the anionic surfactant having a sulfo group is an alkylbenzene sulfonate. 8. The aqueous pesticide composition according to claim 4, wherein the anionic surfactant having a sulfo group is calcium dodecylbenzenesulfonate or sodium dodecylbenzenesulfonate.