Iron Manganese Complex Siccative for Low Coloration Drying
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Solution Overview
Problem
Existing drying agents for paints and inks, particularly those based on iron compounds, require high dosages to achieve satisfactory drying activity, leading to unwanted coloration issues due to the imparted yellowish/brownish hue.
Innovation Solution
The use of iron or manganese complexes with tetradentate, pentadentate, or hexadentate nitrogen donor ligands as siccative agents in settable liquid compositions, such as alkyd-based resins, which facilitate curing at relatively low concentrations without the coloration issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high dosages of iron compounds are used as drying agents, then satisfactory drying activity is achieved, but unwanted yellowish/brownish coloration is imparted to the mix
Solution Approach 1:
The patent changes the chemical structure parameters of the iron compound by introducing specific ligands (β-diketonate, phenolate, carboxylate) with particular molecular configurations. This structural modification enables the iron compound to achieve high drying activity at lower concentrations while minimizing coloration, as the specific ligand structure controls both the catalytic activity and the optical properties of the complex
Solution Approach 2:
The patent creates composite iron compounds by combining iron ions with multiple types of organic ligands (β-diketonate, phenolate, carboxylate) in specific ratios. This composite structure synergistically enhances the drying catalyst activity while the organic ligands mask the inherent color of iron compounds, achieving effective drying with reduced yellowish/brownish coloration
2Speed
If high dosages of siccative are used to achieve satisfactory drying, then drying rate is improved, but color integrity of the paint or ink is compromised
Solution Approach 1:
The patent modifies the molecular parameters of the siccative by selecting specific iron compounds with β-diketonate, phenolate, or carboxylate ligands that have optimized electron distribution and molecular geometry. These parameter changes enable the siccative to function at lower concentrations (0.01-5 wt%) while maintaining high drying rates and preserving color integrity through reduced light absorption in the visible spectrum
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
These complexes enable efficient curing and hardening of paints and inks at lower concentrations, significantly improving drying rates and maintaining the original color integrity.
Implementation Method 1
The siccative is the component of the liquid composition that facilitates drying, curing, setting, or hardening of the composition
Implementation Method 2
WO 03/093384 describes the use of transition-metal salts or complexes based on pyrazoles, aliphatic and aromatic amines, 2,2′-bipyridine, 1,10′-phenanthroline, 1,4,7-trimethyl-1,4,7-triazacyclononane in combination with a reducing agent as drying agent
Data Source
AI summary
Curing agents for air-drying alkyd-based resins, coatings, such as paint, varnish or wood stain, inks and linoleum floor coverings, based on an iron/manganese complex containing tetradentate, pentadentate or hexadentate nitrogen donor ligands are disclosed.