Aqueous suspension formulation of encapsulated pesticide

Details Aqueous suspension formulation of encapsulated pesticide Aqueous suspension formulation of encapsulated pesticide

1999-05-06

2002-07-30

Levy, Neil S. (Department: 1616)

Drug, bio-affecting and body treating compositions

Preparations characterized by special physical form

Biocides; animal or insect repellents or attractants

C424S417000, C514S521000, C514S531000

Reexamination Certificate

active

06426082

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to an aqueous suspension formulation of encapsulated pesticide.
BACKGROUND OF THE INVENTION
Recently, aqueous suspension of encapsulated pesticide which is obtainable by microencapsulation process of a pesticidal active ingredient in water have been attracted attention in view of stabilization of active ingredient, persistency of efficacy, decrease of toxicity and so on.
It is known to add a thickner, such as polysalcharides and mineral powders, for keeping an aqueous suspension of encapsulated pesticide stable for a long period. However, the excess addition of a thickner makes the aqueous suspension sticky and it often causes the difficulty of dealing the aqueous suspension.
SUMMARY OF THE INVENTION
The object of the present invention is to serve an aqueous suspension formulation of encapsulated pesticide which is easy to handle and excellent in preservative stability.
The present invention is the aqueous suspension formulation of encapsulated pesticide containing a specific amount of a specific nonionic water-soluble substance.
In other words, the present invention relates to an aqueous suspension formulation of encapsulated pesticide comprising 3 to 30% by weight of nonionic water-soluble substance which is solid at room temperature and has 50 to 700 of molecular weight (hereinafter referred as “the present microencapsulated slurry formulation”). The present microencapsulated slurry formulation is also highly antiseptic.
DETAILED DESCRIPTION OF THE INVENTION
The water-soluble substance utilized in the present invention has 50 to 700 of molecular weight, and it is solid at room temperature and nonionic water-soluble substance. And it usually has no surfactant ability. Examples of the water-soluble substance used in the present invention include water-soluble organic compounds such as sugars (e.g. monosaccharide oligosaccharide and so on) and urea (molecular weight:60).
Examples of the monosaccharide include triose such as glyceraldehyde (m.w.:90) and dioxyacetone (m.w.:90); tetraose such as erythrose (m.w.:120), threose (m.w.:120) and erythrulose (m.w.:120); pentose such as ribose (m.w. :150), arabinose (m.w.:150), xylose (m.w.:150), lyxose (m.w.:150) and xylulose (m.w.:150); hexose such as glucose (m.w.:180), mannose (m.w.:180), galactose (m.w.:180), fructose (m.w.:180), sorbose (m.w.:180) and tagatose (m.w.:180); heptose such as mannoheptose (m.w.:210) and sedoheptulose (m.w.:210); and monosaccharide derivatives such as sorbitol (m.w.:182), mannitol (m.w.:182) and glucuronic acid (m.w.:194).
Examples of the oligosaccharide include disaccharide such as cellobiose (m.w.:342), trehalose (m.w.:342), lactose (m.w.:342) and sucrose (m.w.:342); trisaccharide such as maltotriose (m.w.:504); and tetrasaccharide such as maltotetraose (m.w.:666). The amount of the water-soluble substance used in the invention is 3 to 30% by weight, preferably 5 to 20% by weight in the present microencapsulated slurry formulation.
The present microencapsulated slurry formulation is an aqueoue suspension of microcapsules (microencapsulated pesticidal active ingredient in the wall substance) and usually comprises an encapsulated pesticidal active ingredient, the water-soluble substance used in the invention, water, a disersant and optionally additives such as a preventing agent for precipitating crystaline, a fluidity-adjusting agent and an antifreezing agent.
The average diameter of the microcapsules is usually 0.1 to 200 &mgr;m, preferably 1 to 100 &mgr;m.
The pesticidal active ingredients include insecticidal, fungicidal, herbicidal, plant growth regulating and insect growth regulating compounds and so on, and are exemplified by organophosphorus compounds such as fenitrothion[O,O-dimethyl O-(3-methyl-4-nitrophenyl)phosphorothioate], fenthion[O,O-dimethyl O-(3-methyl-4-(methylthio)phenyl)phosphorothioate], diazinon[O,O-diethyl O-2-isopropyl-6-methylpyrimidin-4-yl phosphorothioate], chlorpyrifos[O,O-diethyl O-3,5,6-trichloro-2-pyridyl phosphorothioate], acephate[O,S-dimethyl acetylphosphoramidothioate], methidathion[S-2,3-dihydro-5-methoxy-2-oxo-1,3,4-thiadiazol-3-ylmethyl O,O-dimethyl phosphorodithioate], disulfoton[O,O-diethyl S-2-ethylthioethyl phosphorodithioate], DDVP[2,2-dichlorovinyl dimethyl phosphate], sulprofos[O-ethyl O-4-(methylthio)phenyl S-propyl phosphorodithioate], cyanophos[O-4-cyanophenyl O,O-dimethyl phosphorothioate], dioxabenzofos[2-methoxy-4H-1,3,2-benzodioxaphosphorine 2-sulfide], dimethoate[O,O-dimethyl S-(N-methylcarbamoylmethyl) dithiophosphate], phenthoate[ethyl 2-dimethoxyphosphinothioylthio(phenyl)acetate], malathion[diethyl (dimethoxyphosphinothioylthio)succinate], trichlorfon[dimethyl 2,2,2-trichloro-1-hydroxyethylphosphonate], azinphos-methyl[S-3,4-dihydro-4-oxo-1,2,3-benzotriazin-3-ylmethyl O,O-dimethyl phosphorodithioate], monocrotophos[dimethyl {(E)-1-methyl-2-(methylcarbamoyl)vinyl}phosphate], ethion[O,O,O′,O′-tetraethyl-S,S′-methylenebis(phosphorodithioate)] and so on; carbamate compounds such as BPMC [2-sec-butylphenyl methylcarbamate], benfuracarb[ethyl N-{2,3-dihydro-2,2-dimethylbenzofuran-7-yloxycarbonyl(methyl)aminothio}-N-isopropyl-&bgr;-alaninate], propoxur[2-isopropoxyphenyl N-methylcarbamate], carbosulfan[2,3-dihydro-2,2-dimethyl-7-benzo[b]furanyl N-dibutylamninothio-N-methylcarbamate], carbaryl[1-naphthyl N-methylcarbamate], methomyl[S-methyl N-(methylcarbamoyloxy) thioacetimidate], ethiofencarb[2-(ethylthiomethyl)phenyl methylcarbamate], aldicarb [2-methyl-2-(methylthio)propionaldehyde O-methylcarbamoyloxime], oxamyl[N,N-dimnethyl-2-methylcarbamoyloxyimino-2-(methylthio)acetamide], fenothiocarb[S-4-phenoxybutyl N,N-dimethylthiocarbamate], and so on; pyrethroid compounds such as etofenprox[2-(4-ethoxyphenyl)-2-methyl-1-(3-phenoxybenzyl)oxypropane], fenvalerate[(RS)-&agr;-cyano-3-phenoxybenzyl (RS)-2-(4-chlorophenyl)-3-methylbutyrate], esfenvalerate[(S)-&agr;-cyano-3-phenoxybenzyl (S)-2-(4-chlorophenyl)-3-methylbutyrate], fenpropathrin[(RS)-&agr;-cyano-3-phenoxybenzyl 2,2,3,3-tetramethylcyclopropanecarboxylate], cypermethrin[(RS)-&agr;-cyano-3-phenoxybenzyl (1RS)-cis,trans-3-(2,2-dichlorovinyl)-2,2-dimethylcyclopropanecarboxylate], permethrin[3-phenoxybenzyl (1RS)-cis,trans-3-(2,2-dichlorovinyl)-2,2-dimethylcyclopropanecarboxylate], cyhalothrin[(RS)-&agr;-cyano-3-phenoxybenzyl (1RS,3Z)-cis-3-(2-chloro-3,3,3-trifluoroprop-1-enyl)-2,2-dimethylcyclopropanecarboxylate], deltamethrin[(S)-&agr;-cyano-3-phenoxybenzyl (1R)-cis-3-(2,2-dibromovinyl)-2,2-dimethylcyclopropanecarboxylate], cycloprothrin[(RS)-&agr;-cyano-3-phenoxybenzyl (RS)-2,2-dichloro-1-(4-ethoxyphenyl) cyclopropanecarboxylate], fluvalinate[&agr;-cyano-3-phenoxybenzyl N-(2-chloro-&agr;, &agr;, &agr;-trifluoro-p-tolyl)-D-valinate], bifenthrin[2-methyl-3-phenylbenzyl (1RS,3Z)-cis-3-(2-chloro-3,3,3-trifluoro-1-propenyl)-2,2-dimethylcyclopropanecarboxylate], halfenprox[2-(4-bromodifluoromethoxyphenyl)-2-methyl-1-(3-phenoxybenzyl) methylpropane], tralomethrin[(S)-&agr;-cyano-3-phenoxybenzyl (1R)-cis-3-(1,2,2,2-tetrabromoethyl)-2,2-dimethylcyclopropanecarboxylate], silafluofen[(4-ethoxyphenyl)-{3-(4-fluoro-3-phenoxyphenyl)propyl}dimethylsilane], d-phenothrin[3-phenoxybenzyl (1R)-cis,trans-2,2-dimethyl-3-(2-methyl-1-propenyl)cyclopropanecarboxylate], cyphenothrin[(RS)-&agr;-cyano-3-phenoxybenzyl (1R)-cis,trans-2,2-dimethyl-3-(2-methyl-1-propenyl)cyclopropanecarboxylate], d-resmethrin[5-benzyl-3-furylmethyl (1R)-cis,trans-2,2-dimethyl-3-(2-methyl-1-propenyl)cyclopropanecarboxylate], acrinathrin[(S)-&agr;-cyano-3-phenoxybenzyl (1R,3Z)-cis-(2,2-dimethyl-3

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