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It is a dispersant for aqueous suspension concentrates. It is useful in pesticide formulations for keeping particles in a deflocculated state by the for. Aug 30, One example of a polymeric dispersant with a higher HLB value ~ is Croda’s Atlox , Figure 2. Atlox is a hydrophilic methyl. View details of Atlox import data and shipment reports in US with product description, price, date, quantity, major us ports, countries and buyer, supplier.
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This creates a larger steric barrier effectively preventing droplet coalescence and so the stability of the emulsion is increased. When emulsifying the melt the pesticide droplets are usually comminuted to achieve the desired droplet size. If pyraclostrobin is the first pesticide compound, suitable pesticide compounds which may be co-formulated with pyraclostrobin include e.
This is the volume of syneresis liquid clear liquid on top divided by the total sample volume expressed as a percentage. In the aqueous suspension, which is added to the aqueous emulsion of the pesticide compound, the pesticide compound is present in essentially crystalline form.
Comminution can be performed similar to the procedure described for comminution of the attlox droplets.
According to the process of the present invention, an aqueous emulsion of the organic pesticide compound is provided, wherein the organic pesticide compound is present in the form droplets of an amorphous form of said organic pesticide compound. Thus further comminution after addition of the aqueous suspension to the emulsion is generally not required.
The 413 size of the pesticide compound particles will generally in the range given for the aqueous emulsion. The aqueous suspension obtained in step b will generally contain the one or more surfactants contained in the aqueous emulsion and in the aqueous suspension of the pesticide compound that atlod been ahlox to the aqueous emulsion. Suitable thickeners are compounds which affect the flow behavior of the suspension concentrate and may assist in stabilizing the suspension concentrate against caking.
These products offer benefits from advanced rheology control, fragrance management, powerful wetting, dispersing and foaming performance, aflox gentle cleaning and skin mildness.
This is, because the pesticide compound particles might undergo uncontrolled particle growth due to “Ostwald’s ripening” as the residual solubility of the pesticide in the aqueous suspension medium will be sufficient to allow crystallization processes such as crystallization of amorphous material or phase change of allotropic forms if the pesticide is capable of forming poly- morphs.
The thus obtained formulation have the form of an aqueous suspension i.
Suitable antifreeze agents include mono- and polyols, in particular C1-C4 alkanols and polyhydric C2-C4 alcohols. Generally, the aqueous suspension will be prepared by suspending the solid pesticide compound, which is essentially crystalline, in water which may contain one or more surfactants to stabilize the pesticide compound particles followed by comminution of the suspended pesticide compound to the desired particle size.
The weight ratio from acid monomer to hydrophobic monomer is preferably in the range of from The PEO moiety typically comprises from 5 to 50 ethylene oxide groups. Recently, AgroPages leant from Zhejiang Zhongshan Chemical Group, a Chinese leading agrochemical manufacture that the company has completed a number of pesticid A particularly suit- able example for surfactants c.
In the melt-emulsification process the molten organic compound is emulsified in the aqueous phase by applying high shear to the mixture which is then quenched.
The surfactants include non-polymeric surfactants which are also termed emulsifiers and polymeric surfactants, which may also termed as protective colloids. Then g of the aqueous pyraclostrobin suspen- sion obtained in step b and In a preferred embodiment of the present invention, the emulsion comprises at least one polymeric surfactant having at least one polyether group, in particular a non-ionic polymeric surfactant having at least one polyether group, in particular at least one poly- C2-C4-alkylenether group, or an anionic polymeric surfactant having at least one polyether group, in particular at least one poly-C2-C4-alkyleneether group or mixtures thereof.
PAO usually ranges from 1: The mobile phase is a gradient consisting of acetonitrile, methyl-t-butyl ether, water, isopropyl alcohol, methanol, and phosphoric acid. Preferred C3-C5 monoethylenically unsaturated carboxylic acid monomers include acrylic acid, methacrylic acid and maleic acid. The process according to any of claims 12 or 13, where the aqueous emulsion additionally contains at least one nonionic surfactant having at least one polyether group.
In a preferred embodiment, the backbone of the surfactants c. In the group of surfactants c.
After that time the formulations were analysed atlix regard to heat of fusion, onset of melting, active ingredient content and particle size and compared with the initial value. The process according to claim 3, where in step b an aqueous suspension of pyraclostrobin is added, where pyraclostrobin is essentially present in the form of its crystalline modification IV.
However, the emulsion may also comprise only one or more non-ionic surfactants. The suspension of reference example 5 was used instead of the suspension of reference example 4 and surfactant 3 was replaced by the same amount of surfactant 2.
In particular, the term “aqueous suspension concentrate”, as used herein, includes aqueous suspension concentrates for field application, which are also termed as SC formulations, as well as aqueous suspension concentrate formulations for seed treatment, which are also referred to as FS formulations. The surfactants, which are contained in the aqueous suspension, may be identical with or different from atlod surfactants contained in the aqueous emulsion.
Principally, SCs can be easily diluted with water and thus provide an easy-to-hand Ie way of application of the pesticide in the field. Moreover, the pesticide may melt during comminution because of the mechanical energy introduced by the comminution thereby causing clogging of the milling apparatus.
Further formulation additives may also be added during or after the addition of the further pesticide compound. The further pesticide compound may be water soluble or may have limited water solubility as defined herein, the latter being preferred. Preferably, the surfactants that are contained in the suspensions are similar to those which are contained in the emulsions.
The mixture was heated to 70 0 C. It atlkx be seen that the crystals grew for a period of more than 4 h the growing crystals having the shape of the initial seed crystals. The suspension concentrates are dilution stable, even after prolonged storage, i. Forward Favorites Print Share.
In a very preferred embodiment of the present invention, the surfactant additionally comprises at least one non-ionic surfactant. It is, of course, also possible to suspend the solid pesticide compound in water, which may contain may contain at least one or more sur- factants and optionally further formulation additives, and heating the suspension to a temperature above the melting temperature of said pesticide compound.
This new molecule is a high molecular weight polymeric emulsifier and dispersant with low HLB developed to provide excellent stability when used in a variety of crop formulations. Examples include high shear mixers, such as Ultra-Turrax apparatus, and dissolvers, static mixers, e. Preferably, the emulsion of the pesticide compound is prepared by emulsifying the molten pesticide compound in water which may contain one or more surfactants.
Irreversible adsorption of the polymer backbone from multiple anchoring points occurs as the greater steric repulsion generated by the addition of polymeric dispersants moves the minimum in the Potential Energy Curve, reducing overall viscosity, Figure 1.
The process according to any of the preceding claims, where the aqueous emul- sion additionally contains at least one anionic polymeric surfactant having polyether side chains. 49113 a particular preferred embodiment of wtlox invention, the emulsion comprises at least one non-ionic polymeric surfactant, in particular a non-ionic polymeric surfactant of the groups c.