Plant protecting and regulating compositions – Plant growth regulating compositions – Organic active compound containing
Reexamination Certificate
2002-05-20
2004-08-10
Pryor, Alton N. (Department: 1616)
Plant protecting and regulating compositions
Plant growth regulating compositions
Organic active compound containing
Reexamination Certificate
active
06774087
ABSTRACT:
This application is a 371 of PCT/US00/17047 field Jun. 21, 2000.
FIELD OF THE INVENTION
The present invention relates to a liquid composition, which contains carfentrazone-ethyl (common name) and has improved storage stability.
BACKGROUND OF THE INVENTION
Carfentrazone-ethyl is a compound that acts as a herbicide for foliage treatment in upland farming, and exhibits excellent herbicidal activity against all harmful broad-leaved weeds. Carfentrazone-ethyl degrades little and has good storage stability in solid compositions including granules, wettable granules, etc. However, in liquid compositions containing water as a medium it is hydrolyzed by water. Therefore, improving the storage stability of carfentrazone-ethyl in such liquid compositions is much desired.
SUMMARY OF THE INVENTION
Accordingly, the object of the present invention includes a liquid herbicide composition with good storage stability in which carfentrazone-ethyl is prevented from being degraded in storage. More specifically, the present invention is a liquid herbicide composition containing carfentrazone-ethyl, an anionic surfactant, a water-soluble organic compound and water and having a pH of from 2 to 7.
DETAILED DESCRIPTION OF THE INVENTION
A liquid herbicide composition of the following [1] to [10] (hereinafter referred to as “the composition of the inventions”) has now been found in which carfentrazone-ethyl is prevented from being degraded in storage.
[1] A liquid herbicide composition containing carfentrazone-ethyl, an anionic surfactant, a water-soluble organic compound and water and having pH of from 2 to 7.
[2] The liquid herbicide composition of [1] above, which has a viscosity of from 1 to 150 mPaS.
[3] The liquid herbicide composition of [2] above, which has a viscosity of from 1 to 100 mPaS.
[4] The liquid herbicide composition of any of [1] to [3] above, which has a pH of from 2 to 6.
[5] The liquid herbicide composition of any of [1] to [4] above, wherein an aqueous 5 wt. % solution of the anionic surfactant has pH of from 1 to 7.
[6] The liquid herbicide composition of any of [1] to [5] above, wherein the anionic surfactant is at least one selected from sulfate-type surfactants and phosphate-type surfactants.
[7] The liquid herbicide composition of [6] above, wherein the sulfate-type surfactant is at least one selected from polyoxyethylene monostyrylphenyl ether sulfates, polyoxyethylene distyrylphenyl ether sulfates and polyoxyethylene tristyrylphenyl ether sulfates, and their salts.
[8] The liquid herbicide composition of [6] above, wherein the phosphate-type surfactant is at least one selected from polyoxyethylene monostyrylphenyl ether phosphates, polyoxyethylene distyrylphenyl ether phosphates and polyoxyethylene tristyrylphenyl ether phosphates, and their salts.
[9] The liquid herbicide composition of any of [1] to [8] above, which is in the form of a suspension.
[10] The liquid herbicide composition of [9] above, which is in the form of a microemulsion.
To produce the composition of the invention, the components are gently mixed and stirred, and the composition thus produced could readily be in the form of a uniform liquid composition. To produce it, therefore, any conventional stirring machines can be used. To that effect, the composition has the advantage of productivity.
The anionic surfactant usable in the invention includes the following (a) to (d).
(a) Carboxylic acid-type surfactants:
For example, they include carboxylic acids such as polyacrylic acids, polymethacrylic acids, polymaleic acids, copolymers of maleic acid and olefins (e.g., isobutylene, diisobutylene, etc.), copolymers of acrylic acid and itaconic acid, copolymers of methacrylic acid and itaconic acid, copolymers of maleic acid and styrene, copolymers of acrylic acid and methacrylic acid, copolymers of acrylic acid and methyl acrylate, copolymers of acrylic acid and vinyl acetate, copolymers of acrylic acid and maleic acid, N-methyl-(C
12
-C
18
) fatty acid sarcosinates, resin acids, (C
12
-C
18
) fatty acids, etc.; and salts of such carboxylic acids.
(b) Sulfate-type surfactants:
For example, they include sulfates such as (C
12
-C
18
) alkyl sulfates, polyoxyethylene (C
12
-C
18
) alkyl ether sulfates, polyoxyethylene (mono or di)(C
8
-C
12
) alkylphenyl ether sulfates, sulfates of polymers of polyoxyethylene (mono or di)(C
8
-C
12
) alkyliphenyl ethers, polyoxyethylene (mono, di or tri)phenylphenyl ether sulfates, polyoxyethylene (mono, di or tri)benzylphenyl ether sulfates, polyoxyethylene (mono, di or tri)styrylphenyl ether sulfates, sulfates of polymers of polyoxyethylene (mono, di or tri)styxylphenyl ethers, sulfates of polyoxyethylene-polyoxypropylene block polymers, sulfated oils, sulfated fatty acid esters, sulfated fatty acids, sulfated olefins, etc.; and salts of such sulfates.
(c) Sulfonic acid-type surfactants:
For example, they include sulfonic acids such as (C
12
-C
22
) paraffinsulfonic acids, (C
8
-C
12
) alkylbentenesulfonic acids, formalin condensates with (C
8
-C
12
) alkylbenzenesulfonic acids, formalin condensates with cresolsulfonic acids, (C
14
-C
16
) a-olefmsulfonic acids, (C
8
-C
12
) dialkyl sulfosuccinic acids, lignin sulfonic acids, polyoxyethylene (mono or di)(C
8
-C
12
) alkylphenyl ether sulfonic acids, half esters of polyoxyethylene (C
12
-C
18
) alkyl ether sulfosuccinic acids, naphthalenesulfonic acids, (mono or di)(C
1
-C
6
) alkylnaphthalenesulfonic acids, formalin condensates with naphthalenesulfonic acids, formalin condensates with (mono or di) (C
1
-C
6
) alkylnaphthalenesulfonic acids, formalin condensates with creosote oil sulfonic acids, (C
8
-C
12
) alkyldiphenyl ether disulfonic acids, Igepon T (trade name), polystyrenesulfonic acids, copolymers of styrenesulfonic acid and methacrylic acid, etc.; and salts of such sulfonic acids.
(d) Phosphate-type surfactants:
For example, they include phosphates such as (C
8
-C
12
) alkyl phosphates, polyoxyethylene (C
12
-C
18
) alkyl ether phosphates, polyoxyethylene (mono or di)(C
8
-C
12
) alkylphenyl ether phosphates, phosphates of polymers of polyoxyethylene (mono, di or tri)(C
8
-C
12
) alkylphenyl ethers, polyoxyethylene (mono, di or tri)phenylphenyl ether phosphates, polyoxyethylene (mono, di or tri)benzylphenyl ether phosphates, polyoxyethylene (mono, di or tri)styrylphenyl ether phosphates, phosphates of polymers of polyoxyethylene (mono, di or tri)styrylphenyl ethers, phosphates of polyoxyethylene-polyoxypropylene block polymers, phosphatidyl cholines, phosphatidyl ethanolimines, polyphosphates (e.g., tripolyphosphate, etc.), etc.; and salts of such phosphates.
Salts of above (a) to (d) include those with alkali metals (lithium, sodium, potassium, etc.), alkaline earth metals (calcium, magnesium, etc.), ammonium and various amines (e.g., alkylamines, cycloalkylamines, aLkanolamines, etc.), etc.
One or more of these surfactants can be used herein either singly or as combined. If desired, the anionic surfactant may be combined with any of nonionic surfactants and cationic surfactants.
Preferably, the anionic surfactant for use in the invention is such that its aqueous 5 wt. % solution has pH of from 1 to 7, more preferably from 1 to 5, in order to further improve the storage stability of carfentrazone-ethyl in the composition.
Also in order to further improve the storage stability of carfentrazone-ethyl in the composition, the anionic surfactant is preferably selected from sulfate-type surfactants and phosphate-type surfactants, including, for example, acids such as polyoxyethylene monostyrylphenyl ether sulfates, polyoxyethylene distyrylphenyl ether sulfates, polyoxyethylene tristyrylphenyl ether sulfates, polyoxyethylene monostyrylphenyl ether phosphates, polyoxyethylene distyrylphenyl ether phosphates, polyoxyethylene tristyrylphenyl ether phosphates, etc., and their salts. Of
Kamihara Chiako
Nakayama Kazunari
FMC Corporation
FMC Corporation
Pryor Alton N.
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