Phosphate-Free Detergent Tablet Hardness and Disintegration
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Solution Overview
Problem
Detergent and cleaning agent tablets face issues with insufficient disintegration and dissolution under application conditions, and inadequate stability during packaging, transport, and handling, leading to edge breakage and abrasion.
Innovation Solution
A phosphate-free, single- or multi-phase detergent or cleaning agent tablet with a specific mixture of builders and cleaning-active polymers, containing sodium carbonate, sodium bicarbonate, citrate, and amphoteric polymers, with limited citric acid content, to enhance hardness, disintegration, and resistance to abrasion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If high pressing pressures are used to produce stable molded bodies, then tablet hardness and dimensional stability are improved, but disintegration rate and dissolution rate deteriorate
Solution Approach 1:
The patent changes the chemical composition parameters of the tablet phase, specifically using a builder system with citrate (10-84.8 wt.%) and sodium carbonate/bicarbonate (15-89.8 wt.%) with limited citric acid (<1 wt%), which modifies the physical-chemical properties of the compressed material to enable post-compression hardening without compromising disintegration
Solution Approach 2:
The patent applies a liquid polymer preparation (40-98 wt.% water, 2-60 wt.% polymer) to the particulate premixture before compression, which creates preliminary bonds between particles that develop into post-compression hardening, allowing the tablet to gain strength after formation without requiring excessive compression pressure
2Reliability
If high pressing pressures are used to ensure tablet stability, then resistance to packaging and transport stresses is improved, but edge breakage and abrasion worsen
Solution Approach 1:
The patent modifies the chemical composition by using a specific builder system with citrate and sodium carbonate/bicarbonate with limited citric acid, which creates a matrix that hardens after compression, reducing brittleness and susceptibility to edge breakage and abrasion during handling
Solution Approach 2:
The patent creates a composite structure by combining particulate premixture (builders, cleaning agents) with liquid polymer preparation, forming a multi-phase system where the polymer matrix binds the particulate materials, providing both stability during transport and reduced edge breakage through flexible bonding
3Ease of manufacture
If compression pressure is reduced to process pressure-sensitive active ingredients, then sensitivity to compression is improved, but tablet hardness deteriorates
Solution Approach 1:
The patent applies liquid polymer preparation to the particulate premixture before compression, creating preliminary bonds that allow compression of pressure-sensitive ingredients at lower pressures while still achieving sufficient hardness through post-compression hardening of the polymer matrix
Solution Approach 2:
The patent changes the chemical composition to include a specific builder system with citrate and sodium carbonate/bicarbonate with limited citric acid, which creates a matrix that undergoes post-compression hardening, enabling lower compression pressures to produce tablets with adequate hardness
Data Source
AI summary
Single or multiphase phosphate-free detergent or cleaning agent tablets, characterized in that the phase, or one of the phases, comprises, based on the overall weight of the phase, a) 15 to 89.8 wt % sodium carbonate and/or sodium hydrogen carbonate, b) 10 to 84.8 wt % citrate, c) 0.05 to 20 wt % of a wash-activated/cleaning-activated polymer, and is free of bleaching agents and comprises less than 1 wt % of citric acid based on the overall weight of the phase, are characterized by ease of manufacturability and good re-hardening characteristics.