JP3789958B2 - Pest control solvent - Google Patents

Description

（式中、Ｒは炭素数１〜４のアルキル基を表す）。
本発明の第１は、前記アルキルジフェニルメタンが、ｐ−ベンジルトルエン２０〜８０重量％、ｍ−ベンジルトルエン２０〜８０重量％およびｏ−ベンジルトルエン０〜３０重量％からなる異性体混合物であることを特徴とする有害生物防除剤用溶剤に関する。
本発明の第２は、本発明の第１において、有害生物が白蟻であることを特徴とする有害生物防除剤用溶剤に関する。
【０００７】
以下に本発明をさらに説明する。
一般に、アルキル基置換の２環芳香族炭化水素において、アルキル基の炭素数が大きくなると分子量も大きくなる。従って、芳香族度（分子全体の炭素数に対する芳香族環の炭素数の割合）が小さくなって、防除剤に対する溶解力が低下し、また粘度も大きくなり浸透力が低下する。
防除剤に対する溶解力と木材への浸透力を高めるためには、上記式〔I〕に示す構造において置換基Ｒの炭素数を１〜４にすることが好ましい。具体的な置換基Ｒは、メチル、エチル、ｎ−プロピル、iso−プロピル、ｎ−ブチル、sec−ブチル、iso−ブチル、tert−ブチルなどである。
従って、上記式〔I〕で表されるアルキルジフェニルメタンの具体例としては、ベンジルトルエン、エチルジフェニルメタン、イソプロピルジフェニルメタン、sec−ブチルジフェニルメタンなどが挙げられる。これらは単独でまたは２種類以上混合して用いることができる。
【０００８】
より好ましくはＲの炭素数は１である。これに該当する化合物はベンジルトルエンであり、これを用いた防除剤が最も好ましい。
ベンジルトルエンには後述の表２に示すように３種の位置異性体があり、そのうちｏ−体は粘度が高い。そのため、ｐ−体およびｍ−体の含有量を多くすることにより粘度を低減したベンジルトルエン異性体の混合物が好ましい。具体的には３種の位置異性体混合物の合計を１００重量％として、ｐ−体が２０〜８０重量％、ｍ−体が２０〜８０重量％、ｏ−体が０〜３０重量％の範囲にあることが好ましい。
なお、式〔I〕において、Ｒの炭素数が０の場合はジフェニルメタンであるが、ジフェニルメタンは融点が２５℃であるため常温で結晶化するので、防除剤の溶剤として好ましくない。
【０００９】
本発明の溶剤は、従来公知の溶剤、例えばフェニルキシリルエタンと比べ、芳香族度が高いために防除剤に対する溶解力が高く、密度が水とほぼ同じで乳剤に用いた場合の乳化安定性が良く、また粘度が小さいために木質材質への浸透力が高い。
【００１０】
次に、上記式〔I〕で表されるアルキルジフェニルメタンの製造方法を、ベンジルトルエンの例について説明する。
ベンジルトルエンは従来公知の方法で容易に製造することができる。例えば、ジフェニルメタンを酸性触媒の存在下でメチルアルコール等のアルキル化剤でアルキル化する方法、トルエンを塩化ベンジル類あるいはベンジルアルコール類などのアラルキル化剤でベンジル化する方法、ゼオライト等の触媒によるトルエンとジフェニルメタンとのトランスアラルキル化反応を用いる方法、さらにトルエンとベンゼンとを二塩化メタンでカップリングする方法等がある。
【００１１】
本発明の溶剤は、従来公知の溶剤、例えばメチルアルコール、エチルアルコールなどのアルコール類、アセトン、メチルエチルケトンなどのケトン類、エチルエーテル、セロソルブなどのエーテル類、ケロシン、イソパラフィン、ノルマルパラフィンなどの脂肪族炭化水素類、シクロヘキサンなどの脂環式炭化水素およびベンゼン、トルエン、キシレン、ドデシルベンゼンなどの芳香族炭化水素などに比べ、沸点が高く臭気が少ないため、噴霧または散布時の火気に対する安全性が高く、かつ臭気や刺激による弊害が少なく環境汚染がない。さらに防除剤原体を溶解する際に原体を分解しまたは変質させて、防除効果の経時的低下を起こすことがない。また溶解時に着色等の現象が少ない有害生物防除剤用溶剤である。
【００１２】
本発明の溶剤は溶解力が高いため、従来公知の溶剤、例えばメチルアルコール、エチルアルコールなどのアルコール系溶剤、アセトン、メチルエチルケトンなどのケトン系溶剤、エチルエーテル、セロソルブなどのエーテル系溶剤、パラフィン、ナフテンなどの炭化水素系溶剤、ベンゼン、トルエン、キシレン、アルキルベンゼン類、イソプロピルナフタレンなどのアルキルナフタレン類、イソプロピルビフェニルなどのアルキルビフェニル類などの芳香族炭化水素系溶剤、および芳香族環を有するアルコール系、ケトン系、エーテル系などの溶剤、あるいは前記式〔I〕で表されるもの以外のジアリールアルカン系溶剤、例えばフェニルキシリルエタン、ジベンジルトルエンなどと任意の割合で混合して用いることができる。
【００１３】
本発明の有害生物防除剤用溶剤、特に白蟻の防除剤に用いる溶剤は、建造物の土台や床下の木質材質、コンクリートなどに散布もしくは噴霧しまたは塗布する木材防蟻剤に用いられるが、さらに樹木や農林産物を含む農作物を害する菌、昆虫、ダニ、線虫、ネズミ、いわゆる雑草、その他の動植物やウィルスの防除に用いられる、殺菌剤、殺虫剤、除草剤、防疫剤その他の薬剤、例えば、殺鼠剤、誘引剤、忌避剤など、および農作物の生理機能の増進や抑制に用いられる植物生長調整剤に対しても有効である。
【００１４】
本発明の溶剤と共に使用する有害生物防除剤原体、特に白蟻防除剤原体は特定のものに限定されないが、溶解時の着色性が低く、安定性などに優れている点から、後述の有機リン系の防除剤が好適である。乳剤として用いるときは、乳化剤の種類は特定されず、従来公知のものにより乳化することができる。
本発明の溶剤を適用し得る具体的な有害生物防除剤、特に白蟻防除剤としては、有機リン系、ピレスリン系およびカーバメート系の白蟻防除剤、およびこれらの混合剤が挙げられる。
白蟻防除剤の具体的な原体としては以下のものがある。
すなわち、有機燐系として、Ｏ,Ｏ−ジエチル−Ｏ−３,５,６−トリクロロ−２−ピリジルホスホロチオエート（商品名：クロルピリホス）、テトラクロロビンホス（商品名：ガードサイド）、ホキシム（商品名：バリサイド）など、ピレスリン系として、サイフルスリン、パーメスリン、テトロメスリン、ビフェンスリンなど、カーバメート系として、２−sec−ブチルフェニル−Ｎ−メチルカーバメート（商品名：バッサ）などが挙げられる。なお上記の例示において、原体の名称は化学名、一般名または国際標準名のいずれかにより示した。
【００１５】
本発明の溶剤を具体的に使用するに当っては、例えば、乳剤、油剤、および粉剤などの固体製剤等、任意の製剤形態とすることができる。
通常、上記原体としての活性成分１重量部当たり、式〔I〕で表されるアルキルジフェニルメタンを０.１〜１０００重量部、好ましくは０.５〜５００重量部の割合で用いる。
【００１６】
乳剤として用いるときは、乳化剤の種類は特定されず、従来公知のものにより乳化することができる。油剤とするときは、単に原体を本発明の溶剤に溶解し、散布もしくは噴霧または塗布する際には適宜に灯油などで希釈する。
例えば、乳剤の形態とするには、本発明の溶剤により原体を溶解して得られる溶液を、適宜の公知の乳化剤、例えば、アルキルナフタレンスルフォネート、ドデシルベンゼンスルフォネート、ジアルキルスルホサクシネートなどのアニオン性界面活性剤、またはポリオキシアルキレンエーテル、ポリオキシエチレンソルビタンアルキレート、ポリオキシアルキレンブロックポリマーなどのノニオン性界面活性剤などにより水に乳化させて製造する。
乳剤には、以上のほか酸化防止剤、紫外線吸収剤、ゲル化防止剤などを、また有機リン系原体の場合には分解防止剤などをさらに加えることができる。
【００１７】
【発明の実施の形態】
前記式〔I〕に示す構造のアルキルジフェニルメタンからなる有害生物防除剤用溶剤は、生物防除剤原体に対する溶解力が高く、木材への浸透力および乳化安定性が良好であり、特に白蟻の防除剤用に適している。
【００１８】
【実施例】
本発明をさらに実施例と比較例により詳しく説明する。
＜実施例＞
ゼオライト系触媒（ＺＳＭ−５）を用いてジフェニルメタンとトルエンを反応させ、ｐ−体が３５重量％、ｍ−体が６０重量％、ｏ−体が５重量％のベンジルトルエン異性体混合物からなる溶剤を得た。溶剤の物性を表１に示す。
【００１９】
＜比較例＞
従来、白蟻防除剤用溶剤として用いられているフェニルキシリルエタン（商品名：ＳＡＳ−２９６、日本石油化学(株)製）を比較例とし、物性を表１に示す。
【００２０】
【表１】

【００２１】
表１に示すように、実施例の溶剤は比較例のものより分子量が小さいため、密度も大きいものであり、芳香族度が高く、また粘度も小さい。芳香族度は構造から算出し得る溶解力のパラメータであり、数値が大きいほど溶解力が高い。さらに溶剤の溶解力を調べるために比分散を測定した。比分散は成分の決定に利用され、溶剤の溶解力を表す指標となるものである。
【００２２】
またベンジルトルエンの各異性体の粘度を表２に示す。
表２から、ｏ−体の粘度は大きく、次いでｍ−体、ｐ−体の順に小さいことが解る。従って、白蟻防除剤溶剤としてできるだけ高い浸透性を得るにためには、ｍ−体およびｐ−体を多く含むベンジルトルエン異性体混合物が好ましい。
【００２３】
【表２】

【００２４】
次ぎに乳化安定性を確認するため、実施例と比較例の溶剤を用いて防除剤の原体（クロルピリホス）を溶解し、乳化剤および水を加えて下記の方法で乳化分散させ、乳化直後と１カ月後の安定性試験を行った。結果を表３に示す。なお、評価は以下の基準による。
良 好：均一に乳化分散
やや良：一部相分離
不 良：相分離
〔乳化分散方法〕
原体４０部を溶剤５５部で溶解した薬剤に、水１５０部と乳化剤（商品名：ガントレッツ ＡＮ−１１９、ＡＧＦ社製）７部を加え、攪拌機（回転数：９０００ｒｐｍ）により乳化した。
【００２５】
【表３】

【００２６】
表３から、実施例の溶剤は密度が水とほぼ同じであり、乳化安定性が良いことが解る。
以上のように、実施例の溶剤は、比較例のものと比較して分子量が小さく芳香族度が高いために防除剤に対する溶解力が高く、また粘度が小さいために防除剤の木質材質への浸透性が良好であり、かつ密度が水とほぼ同じであるために乳化安定性に優れた白蟻防除剤用溶剤である。
【００２７】
【発明の効果】
本発明の請求項１および４の溶剤は、有害生物防除剤原体に対する溶解力が高く、建造物の土台や床下の木質材質への浸透力が高く、乳剤として用いる場合の乳化安定性が良く、有害生物特に白蟻の防除剤に適した溶剤である。
また本発明の請求項２の溶剤は、従来公知の溶剤、例えばフェニルキシリルエタンと比べ、芳香族度が高いために防除剤に対する溶解力が高く、また密度が水とほぼ同じであるため乳剤に用いた場合の乳化安定性が良く、さらに粘度が小さいため木質材質への浸透力が高い。
さらに本発明の請求項３の発明は、ｐ−体およびｍ−体を多く含有させることにより粘度を低減したベンジルトルエン異性体混合物であり、有害生物、特に白蟻の防除剤用溶剤としてより好ましいものである。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a solvent used for a pest, especially a white ant control agent.
[0002]
[Prior art]
Conventionally, control agents for sanitary pests such as mosquitoes and moths, especially white ants, depend on the formulation form such as solid preparations such as liquids, emulsions, sols, wettable powders, water solvents, oils and granules, depending on the place of application. It is used by spraying or spraying on the foundations of buildings, wooden materials under the floor, concrete or soil. For example, an emulsion is obtained by dissolving a control agent base in an organic solvent and emulsifying it in water. The oil agent consists of a solution obtained by dissolving a control agent base in an organic solvent. The solid preparation is produced by dissolving the active ingredient in an organic solvent and coating the carrier with the solution, or impregnating or kneading the solution into the carrier. Forms include powders and granules.
By the way, an emulsion can be diluted with water, so it is as convenient as a wettable powder, but it is more preferable in terms of easy handling because it is easy to prepare a chemical solution, and generally has a higher control effect than a wettable powder. Tend.
[0003]
Conventional solvents include alcohols such as methyl alcohol and ethyl alcohol, ketones such as acetone and methyl ethyl ketone, ethers such as ethyl ether and cellosolve, aliphatic hydrocarbons such as kerosene, isoparaffin and normal paraffin, cyclohexane. And alicyclic hydrocarbons such as benzene, toluene, xylene, dodecylbenzene and the like are used. In addition to these, phenylxylylethane (Japanese Patent Laid-Open No. 4-13602) has been proposed.
[0004]
Here, the following points are mentioned as the conditions that the solvent for the white ant control agent should have.
(1) It has sufficient solubility to dissolve the necessary amount of the control agent base. High solubility is highly preferred because the amount of solvent used can be reduced.
(2) When the control agent base is dissolved, the base is not decomposed or altered so that the control effect does not deteriorate over time. In particular, when used as a solid preparation, long-term persistence of the control effect is important, and stability of solvent physical properties is also required. Moreover, it is preferable that there are few phenomena, such as coloring, at the time of melt | dissolution.
(3) When used as an emulsion solvent, the emulsion stabilizer should not be impaired. When the emulsion stability is poor, the emulsion is broken and the active ingredient is precipitated. This is not preferable because it causes insufficient effects and causes chemical damage. In general, a solvent having a higher polarity and a higher dissolving power requires less attention because it lowers the emulsion stability.
(4) High flash point and boiling point. In particular, it is important in terms of safety against fire because it is sprayed or sprayed under the floor of a house.
(5) There is no unpleasant odor, and preferably an odorless solvent.
(6) It is inexpensive because it is used in large quantities.
(7) Furthermore, there are few harmful effects caused by odor or irritation during spraying or spraying, and they are harmless to human animals.
[0005]
[Problems to be solved by the invention]
However, the selection criteria for solvents differ between the field of white ant control agent, which is under the jurisdiction of the Ministry of Health and Welfare, and the field of agricultural chemical control agents under the jurisdiction of the Ministry of Agriculture, Forestry and Fisheries. In addition, when a conventional solvent, for example, phenylxylylethane described in JP-A-4-13602 is used, the dissolving power with respect to the control agent and the penetrating power into the wood material are not necessarily satisfactory. White ants, unlike pests in the agrochemical field, infiltrate the wood, so it is necessary to allow the control agent to penetrate into the wood, and a solvent with a low molecular weight and a low viscosity is required in order to increase the penetration.
Among conventional solvents, alcohols such as methyl alcohol and ethyl alcohol with low molecular weight, ketones such as acetone and methyl ethyl ketone, ethers such as ethyl ether and cellosolve, fats such as kerosene, isoparaffin, and normal paraffin Use of aliphatic hydrocarbons, alicyclic hydrocarbons such as cyclohexane, and aromatic hydrocarbons such as benzene, toluene, xylene, and dodecylbenzene is conceivable. However, these solvents have a low flash point, a high odor, and have problems with safety and environmental pollution during spraying or spraying. Some of them have a low dissolving power in the control agent. For these reasons, there is a new demand for solvents for pests, particularly white ants.
[0006]
[Means for Solving the Problems]
This onset Ming relates to a solvent for pesticidal agent characterized by consisting of alkyl diphenylmethane a structure represented by the following formula [I], particularly pesticide said alkyl diphenylmethane is characterized in that it consists of benzyltoluene It is related with solvent.
[Chemical 1]

(In the formula, R represents an alkyl group having 1 to 4 carbon atoms).
The first of the present invention is that the alkyldiphenylmethane is an isomer mixture comprising 20 to 80% by weight of p-benzyltoluene, 20 to 80% by weight of m-benzyltoluene and 0 to 30% by weight of o-benzyltoluene. The present invention relates to a characteristic pesticide solvent.
2nd of this invention is related with the solvent for pest control agents characterized by the pest being a white ant in 1st of this invention.
[0007]
The present invention is further described below.
In general, in an alkyl group-substituted bicyclic aromatic hydrocarbon, as the number of carbon atoms in the alkyl group increases, the molecular weight also increases. Therefore, the degree of aromaticity (ratio of the number of carbon atoms in the aromatic ring to the number of carbon atoms in the whole molecule) decreases, so that the dissolving power with respect to the control agent decreases, the viscosity increases, and the penetrating power decreases.
In order to increase the dissolving power with respect to the control agent and the penetrating power to wood, it is preferable that the carbon number of the substituent R is 1 to 4 in the structure represented by the formula [I]. Specific substituents R are methyl, ethyl, n-propyl, iso-propyl, n-butyl, sec-butyl, iso-butyl, tert-butyl and the like.
Therefore, specific examples of the alkyldiphenylmethane represented by the above formula [I] include benzyltoluene, ethyldiphenylmethane, isopropyldiphenylmethane, sec-butyldiphenylmethane and the like. These may be used alone or in combination of two or more.
[0008]
More preferably, R has 1 carbon. A compound corresponding to this is benzyltoluene, and a control agent using this is most preferred.
As shown in Table 2 below, benzyltoluene has three kinds of positional isomers, of which the o-form has a high viscosity. Therefore, a mixture of benzyltoluene isomers whose viscosity is reduced by increasing the contents of p-form and m-form is preferred. Specifically, the total of the mixture of three kinds of positional isomers is 100% by weight, and the p-form is 20 to 80% by weight, the m-form is 20 to 80% by weight, and the o-form is 0 to 30% by weight. It is preferable that it exists in.
In the formula [I], when R has 0 carbon atoms, it is diphenylmethane. However, since diphenylmethane has a melting point of 25 ° C. and crystallizes at room temperature, it is not preferable as a solvent for the control agent.
[0009]
The solvent of the present invention has higher solubility in a control agent due to its higher degree of aromaticity compared to a conventionally known solvent such as phenylxylylethane, and the emulsion stability when used in an emulsion with the same density as water. And has a low viscosity and high penetration into woody materials.
[0010]
Next, the method for producing alkyldiphenylmethane represented by the above formula [I] will be described using an example of benzyltoluene.
Benzyltoluene can be easily produced by a conventionally known method. For example, a method of alkylating diphenylmethane with an alkylating agent such as methyl alcohol in the presence of an acidic catalyst, a method of benzylating toluene with an aralkylating agent such as benzyl chloride or benzyl alcohol, and toluene with a catalyst such as zeolite There are a method using a transaralkylation reaction with diphenylmethane, a method of coupling toluene and benzene with dichloromethane, and the like.
[0011]
The solvent of the present invention is a conventionally known solvent, for example, alcohols such as methyl alcohol and ethyl alcohol, ketones such as acetone and methyl ethyl ketone, ethers such as ethyl ether and cellosolve, aliphatic carbonization such as kerosene, isoparaffin and normal paraffin. Compared with hydrogen, cycloaliphatic hydrocarbons such as cyclohexane, and aromatic hydrocarbons such as benzene, toluene, xylene, dodecylbenzene, etc., because it has a high boiling point and less odor, it is highly safe against fire during spraying or spraying, In addition, there are few harmful effects caused by odor and irritation, and there is no environmental pollution. Furthermore, when the base of the control agent is dissolved, the base is not decomposed or altered, and the control effect does not deteriorate over time. Further, it is a solvent for pesticides that causes little phenomenon such as coloring when dissolved.
[0012]
Since the solvent of the present invention has high dissolving power, conventionally known solvents such as alcohol solvents such as methyl alcohol and ethyl alcohol, ketone solvents such as acetone and methyl ethyl ketone, ether solvents such as ethyl ether and cellosolve, paraffin and naphthene Hydrocarbon solvents such as benzene, toluene, xylene, alkylbenzenes, alkylnaphthalenes such as isopropylnaphthalene, aromatic hydrocarbon solvents such as alkylbiphenyls such as isopropylbiphenyl, and alcohols and ketones having an aromatic ring It can be used by mixing in an arbitrary ratio with a solvent such as a solvent based on ether or ether, or a diarylalkane solvent other than those represented by the formula [I], for example, phenylxylylethane, dibenzyltoluene and the like.
[0013]
Solvents for pest control agents of the present invention, particularly solvents used for white ant control agents, are used for wood ant control agents that are sprayed or sprayed on or applied to the foundations of buildings, wooden materials under the floor, concrete, etc. Fungicides, insecticides, herbicides, epidemics and other drugs used to control fungi, insects, mites, nematodes, mice, so-called weeds, other animals and plants and viruses that damage crops including trees and agricultural and forestry products, such as It is also effective for plant growth regulators used for promoting and suppressing physiological functions of agricultural crops, such as rodenticides, attractants, repellents, and the like.
[0014]
The pest control raw material used in conjunction with the solvent of the present invention, in particular, the white ant control raw material is not limited to a specific one, but it has a low colorability when dissolved and is excellent in stability and the like. Phosphorous control agents are preferred. When used as an emulsion, the type of emulsifier is not specified, and emulsification can be carried out using conventionally known ones.
Specific pest control agents to which the solvent of the present invention can be applied, particularly white pea control agents, include organic phosphorus-based, pyrethrin-based and carbamate-based white ant control agents, and mixtures thereof.
Specific examples of white ant control agents include the following.
That is, as organic phosphorus, O, O-diethyl-O-3,5,6-trichloro-2-pyridyl phosphorothioate (trade name: chlorpyrifos), tetrachlorobinphos (trade name: guardside), foxime (trade name) : Valides) and the like, and pyrethrins such as cyfluthrin, permethrin, tetromethrin, and bifenthrin, and carbamates include 2-sec-butylphenyl-N-methylcarbamate (trade name: Bassa). In the above examples, the name of the drug substance is indicated by either a chemical name, a general name, or an international standard name.
[0015]
When the solvent of the present invention is specifically used, it can be in any preparation form such as solid preparations such as emulsions, oils, and powders.
Usually, the alkyldiphenylmethane represented by the formula [I] is used in an amount of 0.1 to 1000 parts by weight, preferably 0.5 to 500 parts by weight, per 1 part by weight of the active ingredient as the active ingredient.
[0016]
When used as an emulsion, the type of emulsifier is not specified, and emulsification can be carried out using conventionally known ones. When preparing an oil agent, the raw material is simply dissolved in the solvent of the present invention, and when sprayed or sprayed or applied, it is appropriately diluted with kerosene or the like.
For example, in the form of an emulsion, a solution obtained by dissolving the raw material with the solvent of the present invention is converted into an appropriate known emulsifier such as alkyl naphthalene sulfonate, dodecyl benzene sulfonate, dialkyl sulfosuccinate. Or an anionic surfactant such as polyoxyalkylene ether, polyoxyethylene sorbitan alkylate, or a nonionic surfactant such as polyoxyalkylene block polymer.
In addition to the above, an antioxidant, an ultraviolet absorber, an anti-gelling agent, and the like can be added to the emulsion, and in the case of an organophosphorus base, a decomposition inhibitor can be further added.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
The pesticide solvent comprising the alkyldiphenylmethane having the structure represented by the above formula [I] has a high solubility in the biocontrol agent active ingredient, good permeability to wood and emulsification stability, particularly for controlling white ants. Suitable for drug use.
[0018]
【Example】
The present invention will be further described in detail with reference to examples and comparative examples.
<Example>
A solvent comprising diphenylmethane and toluene reacted using a zeolitic catalyst (ZSM-5), and comprising a benzyltoluene isomer mixture of p-form 35 wt%, m-form 60 wt% and o-form 5 wt% Got. Table 1 shows the physical properties of the solvent.
[0019]
<Comparative example>
Conventionally, phenylxylylethane (trade name: SAS-296, manufactured by Nippon Petrochemical Co., Ltd.), which has been used as a solvent for white ants control agents, is used as a comparative example, and the physical properties are shown in Table 1.
[0020]
[Table 1]

[0021]
As shown in Table 1, the solvent of the example has a molecular weight smaller than that of the comparative example, and therefore has a high density, a high degree of aromaticity, and a low viscosity. The degree of aromaticity is a parameter of the dissolving power that can be calculated from the structure. The larger the numerical value, the higher the dissolving power. Further, the specific dispersion was measured in order to investigate the dissolving power of the solvent. The specific dispersion is used to determine the component and serves as an index representing the solvent power of the solvent.
[0022]
Table 2 shows the viscosity of each isomer of benzyltoluene.
From Table 2, it can be seen that the viscosity of the o-isomer is large, and then the m-isomer and the p-isomer are small in this order. Therefore, a benzyltoluene isomer mixture containing a large amount of m-form and p-form is preferable in order to obtain the highest possible penetrability as a white ants controlling agent solvent.
[0023]
[Table 2]

[0024]
Next, in order to confirm the emulsification stability, the control agent (chlorpyrifos) was dissolved using the solvents of Examples and Comparative Examples, and the emulsifier and water were added and emulsified and dispersed by the following method. A stability test was conducted after a month. The results are shown in Table 3. Evaluation is based on the following criteria.
Good: Uniformly emulsified and dispersed Somewhat good: Partial phase separation Unsatisfactory: Phase separation [Emulsification and dispersion method]
150 parts of water and 7 parts of an emulsifier (trade name: GANTREZ AN-119, manufactured by AGF) were added to a drug obtained by dissolving 40 parts of the active ingredient in 55 parts of a solvent, and emulsified with a stirrer (rotation speed: 9000 rpm).
[0025]
[Table 3]

[0026]
From Table 3, it can be seen that the solvents of the examples have substantially the same density as water and have good emulsion stability.
As described above, the solvents of the examples have a high molecular weight and a high aromaticity compared to those of the comparative examples, so that the solvent has a high dissolving power for the control agent, and since the viscosity is low, It is a solvent for white ant control agents that has good permeability and has substantially the same density as water, and therefore has excellent emulsification stability.
[0027]
【The invention's effect】
The solvent according to claims 1 and 4 of the present invention has a high dissolving power with respect to the active substance of the pest control agent, has a high penetrating ability to the base material of the building or the wooden material under the floor, and has a good emulsification stability when used as an emulsion. It is a suitable solvent for pests, especially white ants.
The solvent according to claim 2 of the present invention has higher solubility in a control agent because of its higher degree of aromaticity than a conventionally known solvent such as phenylxylylethane, and its density is almost the same as that of water. Emulsification stability is good when used in the above, and since the viscosity is small, the penetrating power into the woody material is high.
Further, the invention of claim 3 of the present invention is a benzyltoluene isomer mixture having a reduced viscosity by containing a large amount of p-form and m-form, and is more preferable as a solvent for pests, especially white ants. It is.

Claims (2)

p- benzyltoluene 20 to 80 wt%, m-benzyltoluene 20 to 80 wt% and o- benzyltoluene 0-30 wt% harmful pesticides solvent you characterized by comprising a mixture of isomers consisting of.   The solvent for pest control agents according to claim 1, wherein the pest is a white ant.