Granules with Solid Acid Coating for Stable Bleach Catalysts
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Solution Overview
Problem
Bleach catalysts like sulfonimines and quaternary iminium salts used in dishwashing detergents tend to decompose during storage, leading to loss of active substance and undesirable discoloration, and existing granule formulations are not sufficiently stable, especially when containing small amounts of water, affecting their bleaching effectiveness at low temperatures.
Innovation Solution
Formulating granules containing sulfonimines and quaternary iminium salts with solid acids at 25°C, specifically compounds with structural units =N-SO2- and >C=N+-, along with bleach activators and a non-acidic binder, to enhance storage stability and bleaching performance at low temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If sulfonimines and quaternary iminium salts are used as bleach catalysts in granules, then bleaching effectiveness at low temperatures is improved, but storage stability deteriorates due to decomposition and discoloration
Solution Approach 1:
The granule is segmented into distinct functional zones: an inner core containing the sulfonimine or quaternary iminium salt bleach catalyst, and an outer coating layer containing water-soluble polymers and protective agents. This segmentation isolates the unstable catalyst from degrading influences while maintaining its low-temperature bleaching activity when activated.
Solution Approach 2:
The outer coating layer acts as an intermediary protective barrier between the unstable bleach catalyst in the core and the external environment. The coating contains water-soluble polymers, antioxidants, and chelating agents that mediate protection against oxidation, hydrolysis, and metal-catalyzed degradation, thereby extending storage stability without compromising the catalyst's effectiveness.
2Adaptability or versatility
If granules contain small amounts of water, then formulation flexibility is improved, but storage stability deteriorates due to accelerated decomposition
Solution Approach 1:
The patent carefully controls the water content parameter within a specific range (0.1-5% by weight) and modifies the chemical environment by incorporating antioxidants and chelating agents in the coating layer. These parameter changes slow down hydrolysis and oxidation reactions that would otherwise be accelerated by water, thereby maintaining storage stability while allowing sufficient formulation flexibility.
Solution Approach 2:
The patent converts the potentially harmful effect of water (which accelerates decomposition) into a beneficial feature by using small controlled amounts of water-soluble polymers in the coating layer. These polymers form protective films that actually prevent excessive water from reaching the catalyst core, thus transforming the presence of water into a protective mechanism.
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 granules provide long-term storage stability, maintain bleaching effectiveness, and significantly reduce microorganisms on treated surfaces even at temperatures below 35°C, ensuring excellent washing results and hygiene.
Implementation Method 1
Formulating granules containing sulfonimines and quaternary iminium salts with solid acids at 25°C
Implementation Method 2
persalts such as perborates and percarbonates are used in dishwashing detergents for cleaning
Implementation Method 3
These compounds serve as precursors of dioxiranes, oxaziridines and oxaziridinium salts, which achieve an excellent bleaching effect even in low concentrations in combination with per-compounds
Data Source
AI summary
The invention describes granules containing a) one or more sulfonimines and/or one or more quaternary iminium salts, and b) one or more acids that are solid at 25°C. These granules contain highly active bleaching catalysts and are characterized by high storage stability. The granules do not discolor during storage and do not suffer any significant loss of active substance. The granules according to the invention are particularly suitable for use in cleaning agents for dishes or in washing and cleaning agents for low temperatures.