Oil-Continuous Herbicidal Compositions for Stable High Loading
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Solution Overview
Problem
Formulating stable herbicidal compositions with high loadings of chemically unstable and/or ionic active ingredients is challenging due to chemical instability, mutual reactivity, and the need for high surfactant demand, especially in water-based and oil-based dispersions, which affect physical stability and bio-availability.
Innovation Solution
Developing non-water-continuous herbicidal dispersion compositions with an oil continuous phase and dispersed phases, utilizing strongly non-polar oils and specific ratios of nonaqueous liquids to stabilize acetamide and auxin herbicides, along with ionic herbicides, and incorporating high-HLB surfactants without polar solvents to maintain chemical and physical stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If high loadings of ionic compounds are dissolved in the water phase of water-continuous dispersions, then the concentration of active ingredients is improved, but the physical stability of the dispersion deteriorates due to ineffective dispersing agents
Solution Approach 1:
The patent inverts the conventional water-continuous dispersion system to create an oil-continuous dispersion system. This inversion allows ionic compounds to remain in their molecular form within the oil phase rather than dissociating into ions in water, thereby maintaining both high concentration and physical stability. The dispersing agents remain effective in the oil-continuous system because they are not overwhelmed by ionic dissociation.
2Stability of the object's composition
If polar ionic herbicidal actives are formulated as oil dispersions, then the physical stability is improved, but the bio-availability deteriorates due to low solubility and ionic dissociation in non-polar liquids
Solution Approach 1:
The patent changes the polarity parameter of the continuous phase from polar (water) to non-polar (oil), which fundamentally alters the behavior of ionic compounds. In this non-polar environment, ionic compounds do not dissociate, maintaining their molecular form and physical stability while achieving sufficient bio-availability for herbicidal activity.
3Stability of the object's composition
If herbicidal compositions are formulated with high stability against sedimentation, then the storage stability is improved, but the apparent viscosity increases making dispensing difficult
Solution Approach 1:
The patent utilizes the non-polar oil continuous phase to create a dispersion system where particles remain suspended without requiring high viscosity. The oil-based matrix provides adequate stability against sedimentation while maintaining low enough viscosity for easy dispensing, overcoming the trade-off present in water-based systems.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The compositions provide biologically-efficacious, stable mixtures with high herbicide loadings that maintain efficacy over varying temperatures and conditions, allowing easy dilution to water-continuous dispersions without high-shear mixing, and avoid thermodynamic incompatibilities.
Implementation Method 1
an oil continuous phase comprising an acetamide herbicide and a nonaqueous liquid
Implementation Method 2
a dispersed phase in the oil continuous phase and comprising a solid phase herbicide
Data Source
AI summary
The present invention relates to various pesticidal compositions including non-water-continuous herbicidal dispersion compositions and processes for preparing these compositions. The present invention further relates to herbicidal application mixtures including water continuous dispersion compositions, processes for preparing these application mixtures, and various methods of use. Further, the present invention relates to various herbicidal compositions having improved application properties.