Patent Application
20200178526
This invention relates to emulsifiable concentrates. In one aspect, the invention relates to concentrates of aromatic hydrocarbon soluble active ingredients, such as the pyrethroids, while in another aspect the invention relates to emulsifiable concentrates comprising alkylene oxide based glycol alkyl ether ester solvents having a linear, branched or cyclic alkyl group.
Various insecticides, e. g., bifenthrin, and fertilizer additives, e.g., nitrapyrin, are commercially available as emulsifiable concentrates (EC). Aromatic hydrocarbons, such as xylene and naphthalene, are often used as a solvent for EC. Many of these aromatic solvents exhibit adverse health effects and can negatively impact the environment. Also, many EC comprise one or more active ingredients (AI) that are not particularly soluble in aromatic hydrocarbon solvents, e.g., exhibit a solubility of less than 25%. Alternative solvents without, or at least with diminished, health and environmental concerns and that can solubilize more than 25% of an AI are of continuing interest.
In one embodiment the invention is a composition comprising:
For purposes of United States patent practice, the contents of any referenced patent, patent application or publication are incorporated by reference in their entirety (or its equivalent US version is so incorporated by reference) especially with respect to the disclosure of definitions (to the extent not inconsistent with any definitions specifically provided in this disclosure) and general knowledge in the art.
The numerical ranges disclosed herein include all values from, and including, the lower and upper value. For ranges containing explicit values (e.g., 1 or 2; or 3 to 5; or 6; or 7), any subrange between any two explicit values is included (e.g., the range 1 to 7 includes subranges 1 to 2, 1 to 3, 2 to 6; 5 to 7; 3 to 7; 5 to 6; etc.).
The terms “comprising,” “including,” “having,” and their derivatives, are not intended to exclude the presence of any additional component, step or procedure, whether or not the same is specifically disclosed. In order to avoid any doubt, all compositions claimed through use of the term “comprising” may include one or more additional compounds unless stated to the contrary. In contrast, the term, “consisting essentially of” excludes from the scope of any succeeding recitation any other component, step, or procedure, excepting those that are not essential to operability. The term “consisting of” excludes any component, step, or procedure not specifically delineated or listed. The term “or,” unless stated otherwise, refers to the listed members individually as well as in any combination. Use of the singular includes use of the plural and vice versa.
Unless stated to the contrary, implicit from the context, or customary in the art, all parts and percents are based on weight and all test methods are current as of the filing date of this disclosure.
“Aromatic hydrocarbon soluble” and like terms mean that a compound is soluble in an aromatic hydrocarbon under ambient conditions, i.e., 23° C. and atmospheric pressure. In this context, solubility is defined by the approximate volume of solvent in milliliters (mL) needed to dissolve 1 gram (g) of solute. Table 1 provides a summary of common solubility descriptions.
Methods for measurement of active ingredient solubility involve dissolving the solid solute in a solvent using agitation or shaking under specified temperature and time conditions. The saturated solution is then separated from the solid using filtration. The concentration of the solute in the saturated solution is determined by analysis using ultraviolet (UV) spectroscopy or high pressure liquid chromatography with evaporative light scattering, UV, or mass spectrometry detection.
“Aromatic hydrocarbon”, “arene”, “aryl hydrocarbon” and like terms mean a hydrocarbon with sigma bonds and delocalized pi electrons between carbon atoms forming monocyclic or polycyclic rings. Examples include, but are not limited to, benzene, toluene, naphthalene and the like.
“Hydrocarbon” and like terms mean a compound consisting only of carbon and hydrogen atoms.
“Soluble” and like terms mean that a compound can be dissolved with a solvent to form a solution.
“Solution” and like terms mean a homogeneous composition that is (1) variable, i.e., can exist in different concentrations of solute in solvent, (2) all but one component is present in simplest units, e.g., molecules, and (3) can be separated by physical methods into two or more pure substances. In the context of this invention, solution refers to liquid compositions.
“Composition” and like terms mean a mixture or blend of two or more components.
“Emulsion” and like terms mean a mixture of two or more liquids that are normally immiscible (unmixable or unblendable) with one another, i.e., the liquids do not form a solution.
“Emulsifiable concentrate” and like terms mean a formulation in which the concentrate is typically diluted in water to form a stable emulsion. “Stable” and like terms mean that the emulsion will exhibit little, if any, deterioration over 24 hours under ambient conditions, e.g., 23° C. and atmospheric pressure.
“Free of an aromatic hydrocarbon solvent” and like terms mean, in the context of the compositions of this invention, that the composition contains less than (<) 5, or <4, or <3, or <2, or <1, or <0.5, or <0.1, or <0.05, or <0.01, wt % of an aromatic hydrocarbon that can solubilize under ambient conditions (23° C. and atmospheric pressure) an aromatic hydrocarbon soluble compound such as pyrethroid, organophosphate, organosulfite, carbamate, cyclohexanedione, isoxazole, phenoxy, and chloroacetanilide. Any such amount of aromatic hydrocarbon in the composition is typically present as a contaminant and is without any significant effect on the formation, maintenance and intended use of the composition. In one embodiment “free of an aromatic hydrocarbon solvent” means that the composition does not contain any amount of such solvent as measured by conventional gas chromatography (GC) or high pressure liquid chromatography (HPLC).
The first component of the compositions of this invention are aromatic hydrocarbon soluble compounds. Typically these compounds are at least one of the active ingredients in various agricultural compositions, e.g., pesticides, insecticides, herbicides, fungicides, fertilizer additives, etc. These compounds are typically water insoluble and include, but are not limited to, pyrethroid, organophosphate, organosulfite, carbamate, cyclohexanedione, isoxazole, phenoxy, and chloroacetanilide. Specific active ingredients include, but are not limited to, bifenthrin, cypermethrin, lambda-cyhalothrin, kitazin, diazinon, triazophos, fenitrothion, propargite, chlorpyrifos, malathion, phoxim, fenobucarb, carbosulfan, clethodim, clomazone, haloxyfop-r-methyl, butachlor, acetochlor. Specific fertilizer additives include, but are not limited to, nitrapyrin and humic acid. In one embodiment the aromatic hydrocarbon soluble compound is a pyrethroid. In one embodiment the aromatic hydrocarbon soluble compound is the active ingredient bifenthrin.
The aromatic hydrocarbon soluble compound comprises greater than (>) 25, or greater than or equal to (≥) 30, or ≥35, weight percent (wt %) of the emulsion. Typically the aromatic hydrocarbon soluble compound comprises less than or equal to (≤) 75, or ≤70, or ≤55, wt % of the emulsion. In one embodiment the aromatic hydrocarbon soluble compound comprises from >25 to ≤75, or from ≥30 to ≤70, or from ≥35 to ≤55, wt % of the emulsion.
The second component, i.e., the nonaromatic solvent, of the compositions of this invention is at least one of:
(1) a propylene glycol methyl ether propionate,
(2) an ethylene glycol n-butyl ether benzoate,
(3) dipropylene glycol diacetate, and
(4) a glycol alkyl ether ester having a
Hildebrand first developed the concept of describing the solubility properties of a solvent in terms of a numerical solubility parameter. Charles Hansen divided the total solubility parameter into three solubility parameters called Hansen solubility parameters (HSP). These individual parameters represent the dispersion forces (atomic), permanent dipole-permanent dipole forces (molecular), and hydrogen bonding (molecular) contributions to the total energy of vaporization of a liquid. The dispersion parameter (δd) describes “non-polar” interactions arising from atomic forces. The polar parameter (δp) describes interactions between permanent dipoles. The hydrogen bonding parameter (δh) describes the attraction between molecules due to hydrogen bonds. Hansen solubility parameters have units of (J/cc)1/2.
The HSP for many solvents can be obtained from Hansen Solubility Parameters—A User's Handbook, 2nd Edition, CRC Press, 2007. HSP for a given solvent can be derived using group contribution methods as described in Hansen's book or using the Yamamoto Molecular Break method available within the commercial HSPiP computer program. The HSP reported here for butyl CELLOSOLVE™ acetate and butyl CARBITOL™ acetate were obtained from Hansen's book, pages 399 and 418.
Examples of glycol alkyl ether esters having the required Hansen polar and hydrogen bonding parameters include, but are not limited to, 2-(2-butoxyethoxy)ethyl acetate, ethylene glycol n-butyl ether acetate, propylene glycol ethyl ether acetate, propylene glycol isopropyl ether acetate, propylene glycol isobutyl ether acetate, dipropylene glycol methyl ether acetate, and diethyleneglycol ethyl ether acetate.
The amount of the second component in the inventive composition is greater than (>) 25, or greater than or equal to (≥) 30, or ≥45, weight percent (wt %) of the composition. Typically the second component comprises less than or equal to (≤) 75, or ≤70, or ≤55, wt % of the inventive composition. In one embodiment the second component comprises from >25 to ≤75, or from ≥30 to ≤70, or from ≥45 to ≤65, wt % of the inventive composition. Typically the second component consists of just one of propylene glycol methyl ether propionate, ethylene glycol n-butyl ether benzoate, dipropylene glycol diacetate, or glycol alkyl ether ester having the required Hansen polar and hydrogen bonding parameters.
In one embodiment the composition of this invention contains less than (<) 50, or less than or equal to (≤) 40, or ≤30, or ≤20, ≤10, or ≤5, wt % of an aromatic hydrocarbon solvent. In one embodiment the composition of this invention is free of an aromatic hydrocarbon solvent.
In one embodiment the compositions of this invention can comprise more than two components. In one embodiment the compositions of this invention comprise one or more of a surfactant, emulsifier, dispersant, humectant, antioxidant, colorant, adjuvant or other additive.
Surfactants useful in the invention can be anionic, nonionic or cationic in character and can function as wetting agents, suspending agents, anti-foaming and defoaming agents, along with other functions. Blends of anionic and nonionic surfactants are commonly utilized. Surfactants conventionally used in agricultural formulations are described in Encyclopedia of Surfactants, Vol. I-III, Chemical Publishing Co., New York, 1980-81 and in McCutcheon's Detergents and Emulsifiers Annual, MC Publishing Corp., Ridgewood, N.J., 1998. Typical surfactants include, but are not limited to, alkylphenol-alkylene oxide addition products, such as nonylphenol-C18 ethoxylate, alcohol-alkylene oxide addition products, such as tridecyl alcohol-C16 ethoxylate, quaternary amines, such as lauryl trimethyl ammonium chloride, salts of mono and dialkyl phosphate esters, and solid or liquid organosilicones. Examples of useful organosilicone surfactants include commercially available polysiloxane/polyether copolymers such as TEGOSTAB™ (trademark of Evonik AG) B-8462, B-8404 and B-8871, and DC-198 and DC-5043 surfactants, available from Dow Corning, and NIAX™ L-618 and NIAX™ L-627 surfactant from Momentive Performance Materials.
Representative emulsifiers include, but are not limited to, anionic emulsifiers such as alkaline earth, alkali metal, and amine salts of dodecyl benzene sulfonic acid, alkylarylsulfonic acids, and alkylnapthalenesulfonic acids, sodium dialkyl sulfosuccinate, sodium diisoctylsulfosuccinate, and amine salts of ether sulfates. Nonionic emulsifiers include fatty acid alkanolamides, condensation products of fatty alcohols, fatty amines, fatty acid esters, and fatty acid amides with ethylene oxide and/or propylene oxide, condensation products of linear or branched primary alcohols with ethylene oxide and/or propylene oxide, condensation products of linear or branched secondary alcohols with ethylene oxide and/or propylene oxide, fatty esters of polyhydric alcohol esters such as sorbitan fatty acid esters, condensation products of fatty esters of polyhydric alcohol esters with ethylene oxide such as polyoxyethylene sorbitan fatty acid esters, ethoxylated lanolin alcohols, ethoxylated lanolin acids. Cationic emulsifiers include aliphatic mono-, di-, or polyamine acetates and oleates. Combination anionic and nonionic emulsifier products available as preblended products include TENSIOFIX™ B.7416, B.7438, and B.7453 and ATLOX 4851B and 4855B.
Representative dispersants include, but are not limited to, nonionic surfactants and wetting agents such as those prepared by the sequential addition of propylene oxide and then ethylene oxide to propylene glycol, block copolymers of ethylene oxide and propylene oxide, and condensation products of linear alcohols with ethylene oxide and propylene oxide, such as butanol ethylene oxide or propylene oxide copolymer.
Representative humectants include, but are not limited to, propylene glycol, glycerol, and polyethylene glycol.
Representative adjuvants include, but are not limited to, spreaders, petroleum and plant derived oils and solvents, wetting agents. Adjuvants useful in emulsifiable compositions are described in Compendium of Herbicide Adjuvants, 9th Edition,” edited by Bryan Young, Dept. of Plant, Soil, and Agricultural Systems, Southern Illinois University, MC-4415, 1205 Lincoln Dr., Carbondale, Ill. 62901. Examples of adjuvants include, but are not limited to, alkyl polysaccharides and blends, amine ethoxylates, polyethylene glycol esters, ethoxylated alkyl aryl phosphate esters, paraffin oil, horticultural spray oils, methylated rape seed oil, methylated soybean oil, refined vegetable oil, 2-ethyl hexyl stearate, n-butyl oleate, propylene glycol dioleate, isopropyl myristate, and ethylene vinyl acetate terpolymers.
The total amount of optional components in the inventive composition, if present, comprises greater than (>) 0, or greater than or equal to (≥) 0.5, or ≥1, or ≥1.5 weight percent (wt %) of the composition. Typically the total amount of optional components in the composition comprises less than or equal to (≤) 15, or ≤10, or ≤5, or ≤3 wt % of the composition. In one embodiment the total amount of optional components in the composition comprises from >0 to ≤15, or from ≥0.5 to ≤10, or from ≥1 to ≤5, wt % of the composition.
In one embodiment the composition of this invention comprises:
In one embodiment the composition is an emulsifiable composition.
In one embodiment the composition comprises more than two components. In one embodiment the composition comprises from greater than zero to 15 wt % of at least one of a surfactant, emulsifier, dispersant, humectant, antioxidant, colorant or adjuvant.
In one embodiment the composition comprises less than 50 wt % of an aromatic hydrocarbon solvent. In one embodiment the composition is free of an aromatic hydrocarbon solvent.
Emulsifiable concentrates can be prepared in vessels or tanks having agitators for mixing or high shear mixing. All equipment and piping utilized is typically dry and free from moisture or residues of water. Nitrogen may be used to flush air from the process system prior to generation of the emulsifiable concentrate product. Composition components, including active ingredients, fertilizer additives, solvents, surfactants, emulsifiers, dispersants, humectants, adjuvants, antioxidants or colorants are added to the process vessel sequentially, as single components or in groups, with agitation. The components of the emulsifiable concentrate may be added in liquid, solid, or molten forms. The composition is mixed at controlled temperature, typically of 25 to 30° C., for 1 to 2 hours or until a homogeneous solution is obtained. In some cases, the emulsifiable concentrate solution may be filtered using a GAF or similar filter.
The compositions of this invention are further described by the following examples.
DOWANOL™ TPM is tripropylene glycol methyl ether available from The Dow Chemical Company.
DOWANOL™ TPNB is tripropylene glycol n-butyl ether available from The Dow Chemical Company.
Butyl CARBITOL™ Acetate is diethylene glycol n-butyl ether acetate available from The Dow Chemical Company.
Butyl CELLOSOLVE™ Acetate is ethylene glycol n-butyl ether acetate available from The Dow Chemical Company.
DOWANOL™ EPh is ethylene glycol phenyl ether available from The Dow Chemical Company.
DOWANOL™ EPh6 is polyethylene glycol monophenyl ether available from The Dow Chemical Company.
DOWANOL™ PPH is propylene glycol phenyl ether available from The Dow Chemical Company.
DOWANOL™ DiPPH is dipropylene glycol phenyl ether available from The Dow Chemical Company.
CARBITOL™ is diethylene glycol monoethyl ether available from The Dow Chemical Company.
DOWANOL™ PGDA is propylene glycol diacetate available from The Dow Chemical Company.
DIAMOSOLV™ 323 is ethyl laurate available from The Dow Chemical Company.
XU40782.00 is ethylene glycol n-butyl ether benzoate available from The Dow Chemical Company.
Four-milliliter (mL) vials are charged with bifenthrin (10 to 50 wt %), a stir bar, and solvent (90 to 50 wt %). The vials are capped and taped to seal. The vials are secured in a vial rack and shaken on a laboratory shaker for 12 hours at ambient lab temperature (21° C.) and humidity (51%). After 12 hours each sample set is evaluated for solubility of solid:
Yes—Homogeneous clear solution
No—Solids present in the sample
Table 2 reports the results of solubility screening of bifenthrin at 10 to 50 wt %, in various solvents. Most glycol ethers having low water solubility show poor solubility of bifenthrin (20 wt % or less). Green aromatic replacement solvent ethyl laurate (DIAMOSOLV™ 323) shows poor solubility of bifenthrin (20 wt %). Several acetate and diacetate solvents, Butyl CARBITOL™ Acetate, Butyl CELLOSOLVE™ Acetate, and DOWANOL™ PGDA, solubilize bifenthrin at 30 wt % or greater. In particular Butyl CELLOSOLVE™ Acetate solubilizes bifenthrin at 40 wt %.
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/US2017/041302 | 7/10/2017 | WO | 00 |
| Number | Date | Country | |
|---|---|---|---|
| 62362784 | Jul 2016 | US |
