Liquid Manganese Catalyst for Dishwasher Bleaching
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Solution Overview
Problem
Existing bleaching formulations face challenges with accurate dosing and homogeneous distribution of manganese catalysts, leading to potential underdosing or overdosing, and stability issues with water-soluble manganese complex salts.
Innovation Solution
Development of a liquid composition comprising a selected non-aqueous solvent and a manganese complex salt with a non-coordinating counter ion, which is stable and soluble, allowing for improved bleaching performance and storage stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If solid catalyst is used in granules, then dosing accuracy is improved, but distribution homogeneity deteriorates
Solution Approach 1:
The patent changes the physical state of the catalyst from solid granules to liquid solution form. This parameter change allows the catalyst to be dissolved uniformly in the liquid composition, achieving both accurate dosing through controlled concentration and homogeneous distribution throughout the formulation, thereby resolving the contradiction between dosing accuracy and distribution homogeneity.
2Stability of the object's composition
If water-soluble manganese complex salt is used, then distribution homogeneity is improved, but storage stability deteriorates
Solution Approach 1:
The patent introduces a non-aqueous solvent as an intermediary medium to dissolve the water-soluble manganese complex salt. This allows the catalyst to maintain its high solubility and distribution homogeneity characteristics while the non-aqueous environment prevents hydrolysis and degradation reactions, thereby achieving both homogeneous distribution and storage stability simultaneously.
3Stability of the object's composition
If liquid composition is used, then distribution homogeneity is improved, but compatibility with PVOH containers deteriorates
Solution Approach 1:
The patent changes the solvent parameter from aqueous to non-aqueous. This parameter change resolves the compatibility issue with PVOH containers, as non-aqueous solvents do not cause the same degradation or interaction problems that water would with polyvinyl alcohol container materials, while still maintaining the liquid composition's homogeneous distribution benefits.
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 liquid composition achieves stable solubility and high bleaching activity, overcoming the challenges of dosing and stability in traditional solid granule forms, while maintaining compatibility with polyvinyl alcohol (PVOH) containers.
Implementation Method 1
Manganese catalysts based on triazacyclononane ligands are known to be active catalysts in the bleaching of stains
Implementation Method 2
liquid composition which comprises a non-aqueous solvent and a water-soluble manganese complex salt
Data Source
AI summary
Disclosed is a liquid composition containing a solvent selected from the group consisting of mono aliphatic alcohols having two to six carbon atoms, mono-, di-, tri- or tetraalkylene glycols having two, three or four carbon atoms in the alkylene moiety, cyclohexanol, benzyl alcohol or glycerol, whereby each OH group may be optionally, and independently, substituted by a OR group, whereby R is alkyl with 1 to 4 carbon atoms, and whereby the solvent optionally contains 0.01-10 wt-% of an inorganic or organic acid, and dissolved therein a mononuclear or dinuclear Mn(III) and/or Mn(IV) complex salt having a selected non-coordinating counter ion, having a water-solubility of at least 30 g/L at 20° C, and wherein the mononuclear or dinuclear Mn(III) and/or Mn(IV) complex comprises at least one cyclic triamine ligand The liquid compositions and formulations comprising it are suitable for use in catalysing oxidation, for example as a component of a dishwasher bleaching composition. The invention further relates to cleaning agents comprising the liquid compositions described herein.