Aqueous IPBC Dispersion Composition for Storage Stability
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Solution Overview
Problem
Aqueous IPBC dispersions available in the market suffer from instability during storage, leading to increased viscosity and sedimentation due to low water solubility, which affects their applicability.
Innovation Solution
Aqueous dispersions containing 3-iodo-2-propynyl butyl carbamate (IPBC) stabilized with specific ratios of cellulose ethers, ethylene oxide and propylene oxide block copolymers, and thickeners, maintaining a stable viscosity during prolonged storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If aqueous IPBC dispersions are formulated with low water solubility, then IPBC concentration can be reduced, but stability during storage deteriorates due to crystal growth and sedimentation
Solution Approach 1:
The patent introduces specific dispersants and stabilizers as intermediary substances to mediate between IPBC and water. These additives form stable complexes with IPBC crystals, preventing their growth and sedimentation while allowing the formulation to maintain lower IPBC concentrations in aqueous medium.
Solution Approach 2:
The patent modifies physical-chemical parameters of the dispersion system by controlling particle size distribution, pH, and ionic strength. By optimizing these parameters, the formulation achieves enhanced stability at reduced IPBC concentrations through improved colloidal behavior and reduced crystal growth kinetics.
2Reliability
If IPBC is used in solid form or organic solvent concentrates, then antimicrobial efficacy is maintained, but VOC content increases and environmental compatibility deteriorates
Solution Approach 1:
The patent changes the physical state parameter of IPBC from solid or organic concentrate form to aqueous dispersion. This phase transition eliminates VOC emissions while maintaining antimicrobial efficacy through proper dispersion stabilization and particle size control that ensures bioavailability.
Solution Approach 2:
The patent uses aqueous (hydraulic) medium instead of organic solvents to carry and deliver IPBC. This substitution eliminates volatile organic compounds while maintaining effective delivery of the antimicrobial agent through proper dispersion and suspension characteristics.
3Stability of the object's composition
If dispersants are added to improve stability, then storage stability improves, but formulation complexity and number of components increases
Solution Approach 1:
The patent employs dispersant and stabilizer additives that perform multiple functions simultaneously: they disperse IPBC crystals, prevent aggregation, control rheology, and stabilize the aqueous dispersion. This multi-functionality reduces the need for multiple separate additives, simplifying the overall formulation despite enhanced stability requirements.
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 dispersions exhibit improved stability and constant viscosity during storage, preventing sedimentation and maintaining flowability, even at elevated temperatures.
Implementation Method 1
aqueous dispersions containing 3-iodo-2-propynyl butyl carbamate (IPBC) stabilized with specific ratios of cellulose ethers, ethylene oxide and propylene oxide block copolymers, and thickeners, maintaining a stable viscosity during prolonged storage
Implementation Method 2
0.1 to 10 wt. % of at least one thickener and/or anti-settling agent
Implementation Method 3
The dispersions exhibit improved stability and constant viscosity during storage, preventing sedimentation and maintaining flowability, even at elevated temperatures
Data Source
AI summary
The invention relates to an aqueous dispersion comprising the following components: (a) 25 to 60 wt. % of 3-iodo-2-propynyl butyl carbamate (IPBC), (b) 0.05 to 5 wt. % of at least one compound selected from the group consisting of methyl cellulose, hydroxyethyl cellulose, hydrophobically modified hydroxyethyl cellulose, hydroxypropyl methyl cellulose, hydroxypropyl cellulose, hydroxyethyl methyl cellulose and carboxymethyl cellulose, or mixtures of two or more of these, (c) 1 to 10 wt. % of at least one block copolymer based on ethylene oxide and propylene oxide, having a numerically defined average molecular weight of between 1,000 g/mol and 15,000 g/mol, (d) 0.1 to 10 wt. % of at least one thickener and/or anti-settling agent, and (e) up to 100 wt. % of water, in each case based on the total aqueous dispersion. The invention further relates to the use of this dispersion for the protection of technical materials from attack and/or destruction by microorganisms.