Fluroxypyr Ester Formulation Low-Temperature Stability
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Solution Overview
Problem
High-strength formulations of fluroxypyr ester herbicides face stability issues at low temperatures and high concentrations when using aromatic hydrocarbon solvents, and alternative solvents like chlorinated solvents or 1-methyl-2-pyrrolidinone have less desirable environmental profiles.
Innovation Solution
A high-strength, low-temperature stable emulsifiable concentrate of fluroxypyr esters is achieved by using N,N-dimethyl (C6-C12) alkylamide as the solvent, maintaining the formulation as a clear, homogeneous liquid without crystallization down to 0°C, and allowing for standard packaging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If aromatic hydrocarbon solvents are used in fluroxypyr ester formulations, then the formulation achieves high concentration and stability, but the formulation becomes unstable at low temperatures and high concentrations
Solution Approach 1:
The patent changes the chemical parameters of the solvent system by replacing aromatic hydrocarbon solvents with N,N-dimethyl alkylamides. This parameter change in solvent chemistry enables the formulation to maintain stability at low temperatures while achieving high concentrations of fluroxypyr ester, resolving the contradiction between formulation stability and low-temperature performance.
2Quantity of substance
If chlorinated solvents or 1-methyl-2-pyrrolidinone are used to achieve higher concentration formulations, then the formulation concentration increases, but the environmental profile deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters by selecting N,N-dimethyl alkylamides with specific carbon chain lengths (C6-C12). This parameter change enables achieving high formulation concentrations (300-600 g/L fluroxypyr ester) while using solvents with superior environmental profiles compared to chlorinated solvents or 1-methyl-2-pyrrolidinone.
3Quantity of substance
If the formulation is made as high-strength as possible, then the amount of active ingredient increases, but the formulation crystallizes at low temperatures
Solution Approach 1:
The patent changes the solvent parameters by using N,N-dimethyl alkylamides with optimized carbon chain lengths. This parameter change in solvent structure enables the formulation to maintain high active ingredient concentrations (300-600 g/L) without crystallization at low temperatures, as the modified solvent provides better solvation at cold temperatures.
Solution Approach 2:
The patent uses composite solvent systems comprising N,N-dimethyl alkylamides in combination with surfactants. This composite material approach creates a synergistic system where the solvent-surfactant combination maintains liquid stability at low temperatures while supporting high concentrations of fluroxypyr ester active ingredient.
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 formulation is biologically equivalent to existing Starane formulations, reducing environmental impact and packaging needs, while maintaining potency and stability during storage and shipping.
Implementation Method 1
a low-temperature stable, high-strength emulsifiable concentrate of fluroxypyr esters can be prepared by using an N,N-dimethyl alkylamide as the solvent
Implementation Method 2
The herbicidal formulation includes the fluroxypyr ester in an amount sufficient to provide the high-strength formulation with no crystallization at temperatures as low as 0°C
Data Source
AI summary
This invention relates to a high-strength herbicidal formulation containing high concentrations of fluroxypyr ester in an N,N-dimethyl (C6-C12)alkylamide solvent which exhibits significantly greater low temperature stability at high concentrations.