Low-pH Particulate Laundry Detergent for Curry Stain Removal
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Solution Overview
Problem
Laundry detergent powders with lower pH profiles face challenges in maintaining good cleaning performance, particularly against pH-sensitive stains like curry stains, due to the impact of pH on stain removal efficacy.
Innovation Solution
A solid free-flowing particulate laundry detergent composition comprising a detersive surfactant, an iron-based bleach catalyst (FeONIX), and a peroxygen-based bleach, with a pH of 10.0 or less, which enhances curry stain removal performance at low pH.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the pH profile of laundry detergent powder is lowered, then fabric care and freshness are improved, but cleaning performance deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters by introducing a specific iron-based bleach catalyst (FeONIX) that functions effectively at lower pH levels (pH 9.0 or less), enabling the detergent to maintain cleaning performance while operating at reduced pH compared to conventional alkaline detergents
Solution Approach 2:
The patent creates a composite detergent system combining FeONIX iron-based bleach catalyst with peroxygen-based bleach and detersive surfactant, where the synergistic interaction between components enables effective cleaning at low pH that neither component could achieve alone
2Productivity
If the pH profile of laundry detergent powder is lowered, then non-curry stain removal is improved, but curry stain removal deteriorates
Solution Approach 1:
The patent modifies the chemical environment by using FeONIX catalyst with peroxygen-based bleach at low pH, creating conditions where curry stain (curcumin) oxidation is enhanced rather than inhibited, reversing the typical pH-dependent staining behavior
Solution Approach 2:
The patent employs peroxygen-based bleach activated by FeONIX catalyst to generate strong oxidizing conditions that effectively break down curcumin pigments in curry stains, achieving superior stain removal through accelerated oxidation chemistry
3Reliability
If conventional iron-based bleach catalysts (e.g., FeONIX-A) are used, then curry stain removal is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent replaces complex, expensive amine-variant iron catalysts (FeONIX-A) with the simpler, more commercially viable FeONIX catalyst that, while having different chemical characteristics, achieves superior curry stain removal when combined with peroxygen-based bleach
Solution Approach 2:
The patent changes the chemical formulation parameters by optimizing the combination of FeONIX catalyst with specific peroxygen-based bleach and detersive surfactant, creating a system that achieves high cleaning performance without requiring complex catalyst synthesis
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 composition provides effective stain removal, especially for curry stains, while maintaining a low pH profile, thus addressing consumer perception of cleaning performance.
Implementation Method 1
iron-based bleach catalyst having the following structure:
Implementation Method 2
peroxygen-based bleach
Implementation Method 3
provides exceptional curry stain removal performance when combined with a peroxygen based bleach at low pH
Data Source
AI summary
A solid free-flowing particulate laundry detergent composition, wherein the composition including a detersive surfactant, an iron-based bleach catalyst and a peroxygen-based bleach, and the composition having an equilibrium pH at 20° C. at a concentration of 10 g/l in deionized water of 10.0 or less.