Plant protecting and regulating compositions – Plant growth regulating compositions – Organic active compound containing
Reexamination Certificate
2002-02-20
2003-12-16
Clardy, S. Mark (Department: 1616)
Plant protecting and regulating compositions
Plant growth regulating compositions
Organic active compound containing
C504S235000, C504S362000, C514S772000, C514S975000
Reexamination Certificate
active
06664213
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a liquid pesticide composition having a high content of specific polyoxyethylene alkyl ether and an improved biological effect.
BACKGROUND ART
It is known that when various nonionic surfactants are added to a spray solution of an emulsifiable concentrate of Quizalofop-ethyl (general term), a polyoxyethylene alkyl ether improves a herbicidal effect better than other surfactants (Weed Technology, 11, 298-302 (1997)) It is also known that the herbicidal effect of a solid herbicide formulation is improved by adding 0.01 to 0.5 wt % of a polyoxyethylene alkyl ether to a spray solution (EP0968649A1). It is further known that a compound prepared by adding ethylene oxide to a higher alcohol having 13 carbon atoms in an amount of 5 to 8 moles on the average is used as a pesticide spreader (Japanese Laid-open Patent Application No. 9-278605).
DISCLOSURE OF INVENTION
The present inventors have conducted intensive studies and have found that the biological effect of a pesticidally active ingredient is greatly improved by containing a polyoxyethylene alkyl ether in a liquid pesticide composition in high concentration. They have also found that when a polyoxyethylene alkyl ether having a specific HLB value is used, a homogeneous liquid pesticide composition having excellent storage stability can be prepared although a homogeneous liquid pesticide composition having excellent storage stability may not be prepared when the polyoxyethylene alkyl ether is contained in a liquid pesticide composition in high concentration.
That is, the present invention relates to the following liquid pesticide compositions [1] to [11] (to be referred to as “compositions of the present invention” hereinafter).
[1] a liquid pesticide composition comprising a pesticidally active ingredient and a polyoxyethylene alkyl ether which has the following features (a) and (b):
(a) an HLB value of 6 to 13.5 and (b) a content of 10 to 50 wt % based on the liquid pesticide composition.
[2] a liquid pesticide composition comprising a pesticidally active ingredient and a polyoxyethylene alkyl ether which has the following features (a) and (b):
(a) an HLB value of 8 to 13.5 and (b) a content of 10 to 50 wt % based on the liquid pesticide composition.
[3] a liquid pesticide composition comprising a pesticidally active ingredient and a polyoxyethylene alkyl ether which has the following features (a) and (b):
(a) an HLB value of 11 to 13.5 and (b) an content of 10 to 50 wt % based on the liquid pesticide composition.
[4] the liquid pesticide compositions [1] to [3], wherein the pesticidally active ingredient is a herbicide.
[5] the liquid pesticide composition [4], wherein the herbicide is a herbicide having foliar treating activity.
[6] the liquid pesticide composition [5], wherein the herbicide having foliar treating activity is a phenoxypropionic acid herbicide.
[7] the liquid pesticide composition [6], wherein the phenoxypropionic acid herbicide is Quizalofop-ethyl.
[8] the liquid pesticide composition [5], wherein the herbicide having foliar treating activity is a sulfonylurea herbicide.
[9] the liquid pesticide composition [8], wherein the sulfonylurea herbicide is Halosulfuron-methyl.
[10] the liquid pesticide compositions [1] to [3] which are aqueous suspension formulations.
[11] the liquid pesticide compositions [1] to [3] which are emulsifiable concentrates.
The content of the polyoxyethylene alkyl ether in the composition of the present invention must be 10 to 50 wt % to fully improve the biological effect of the pesticidally active ingredient. With a view to reducing the viscosity of the liquid pesticide composition to improve handling properties, it is preferably 30 wt % or less. With a view to further stabilizing the biological effect, it is preferably 15 wt % or more. Therefore, the content of the polyoxyethylene alkyl ether is preferably 10 to 30 wt %, more preferably 15 to 30 wt %.
It is known that polyoxyethylene alkyl ethers have different HLB (Hydrophile-Lipophilic Balance) values according to the type of the alkyl group of an alcohol moiety and the molar ethylene oxide (EO) content. The HLB value is an index of the hydrophilic nature of a surfactant proposed by Griffin. The HLB value of a polyoxyethylene alkyl ether can be obtained from the following Griffin equation.
HLB value=[(molecular weight of hydrophilic moiety)/(molecular weight of surfactant)]×20
The HLB value of a paraffin having no hydrophilic group is 0, the HLB value of polyethylene glycol having no hydrophobic group is 20, and the HLB value of a polyoxyethylene alkyl ether ranges from 0 to 20.
It was found from the research conducted by the present inventors that when a polyoxyethylene alkyl ether having an HLB value of more than 13.5 was contained in a liquid pesticide composition in an amount of 10 to 50 wt %, the sedimentation of a visible insoluble product was observed and a homogeneous liquid pesticide composition having excellent storage stability could not be prepared whereas when a polyoxyethylene alkyl ether having an HLB value of 6 to 13.5 was contained in a liquid pesticide composition in an amount of 10 to 50 wt %, a homogeneous liquid pesticide composition having excellent storage stability could be prepared.
Therefore, the HLB value of the polyoxyethylene alkyl ether used in the present invention must be 6 to 13.5. With a view to further improving the biological effect, the HLB value is preferably 8 to 13.5, more preferably 11 to 13.5.
The mean molar ethylene oxide (EO) content of the polyoxyethylene alkyl ether having an HLB value of 6 to 13.5 used in the present invention is preferably 4 to 20, more preferably 4 to 12, much more preferably 6 to 12. The alkyl group of an alcohol moiety of the polyoxyethylene alkyl ether having an HLB value of 6 to 13.5 used in the present invention may be either linear or branched and the number of carbon atoms of the alkyl moiety is preferably 10 to 18., more preferably 10 to 16, much more preferably 12 to 14.
The composition of the present invention may comprise a surfactant other than the polyoxyethylene alkyl ether, as exemplifiedby the following surfactants (A), (B), (C), (D) and (E).
(A) nonionic surfactants:
(A-1) polyethylene glycol type surfactants: adducts of alkyl naphthols with ethylene oxide, polyoxyethylene (mono- or di-) (C8~C12 alkyl)phenyl ethers, formalin condensates of polyoxyethylene ((mono- or di-) C8~C12 alkyl)phenyl ethers, polyoxyethylene (mono-, di- or tri-)phenyl phenyl ethers, polyoxyethylene (mono-, di- or tri-)benzyl phenyl ethers, polyoxypropylene (mono-, di- or tri-)benzyl phenyl ethers, polyoxyethylene (mono-, di- or tri-)styryl phenyl ethers, polyoxypropylene (mono-, di- or tri-)styryl phenyl ethers, polyoxyethylene (mono-, di- or tri-)styryl phenyl ether polymers, polyoxyethylene polyoxypropylene block polymers, (C12~C18alkyl) polyoxyethylene polyoxypropylene block polymer ethers, (C8~C12alkyl)phenyl polyoxyethylene polyoxypropylene block polymer ethers, polyoxyethylene bisphenyl ethers, polyoxyethylene resin acid esters, polyoxyethylene (C12~C18 fatty acid) monoesters, polyoxyethylene (C12~C18 fatty acid) diesters, polyoxyethylene sorbitan (C12~C18 fatty acid) esters, adducts of glycerol fatty acid esters with ethylene oxide, adduct of castor oil with ethylene oxide, adduct of hardened castor oil with ethylene oxide, adducts of (C12~C18alkyl) amines with ethylene oxide, adducts of (C12~C18 fatty acid) amides with ethylene oxide and the like.
(A-2) polyhydric alcohol type surfactants: glycerol fatty acid esters, polyglycerin fatty acid esters, pentaerythritol fatty acid esters, sorbitol (C12~C18 fatty acid) esters, sorbitan (C12~C18 fatty acid) esters, sucrose fatty acid esters, polyhydric alcohol alkyl ethers, fatty acid alkanol amides and the like.
(A-3) ace
Furusawa Hiroyuki
Hattori Shigeo
Kobayashi Hiromu
Kobayashi Mamoru
Nissan Chemical Industries Ltd.
Oliff & Berridg,e PLC
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