Alkoxylated Substituted Resorcinol Dispersant for Laundry Soil Redeposition
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Solution Overview
Problem
The redeposition of soil from one garment to another during laundry leads to a loss of whiteness and cleaning effectiveness, exacerbated by human sebum, and existing laundry compositions are inadequate in addressing this issue while being biodegradable.
Innovation Solution
Incorporating alkoxylated substituted Resorcinol (ASR) dispersants into laundry detergents, which enhance whiteness and brightness by reducing soil redeposition, along with a combination of surfactants, perfumes, fluorescent agents, and shading dyes in specific concentrations and forms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional laundry compositions are used, then cleaning is performed, but soil redeposition occurs leading to loss of whiteness
Solution Approach 1:
The patent introduces resorcinol-based compounds as intermediary substances that mediate between soil particles and fabric surfaces. These compounds act as dispersants that prevent soil particles from adhering to fabrics by creating a protective barrier, thereby reducing redeposition while maintaining cleaning effectiveness
Solution Approach 2:
The patent modifies the chemical parameters of the laundry composition by incorporating specific resorcinol derivatives with controlled alkyl substitution patterns and concentrations (0.1-10 wt%). This parameter change transforms the composition's ability to interact with soil and fabric surfaces, enhancing whiteness maintenance through controlled chemical interactions
2Productivity
If more surfactants are added to improve cleaning, then soil removal increases, but redeposition of soil is exacerbated
Solution Approach 1:
The patent merges two functional components: surfactants for soil removal and resorcinol-based dispersants for redeposition prevention. This combination creates a synergistic effect where surfactants continue to provide cleaning power while the dispersant component prevents removed soil from redepositing, addressing both functions simultaneously
Solution Approach 2:
The laundry composition is formulated as a composite system containing multiple functional ingredients including surfactants, resorcinol derivatives, and auxiliary agents. This composite approach allows each component to perform its specialized function while contributing to the overall performance, balancing cleaning efficiency with redeposition control
3Manufacturing precision
If existing dispersants are used to reduce redeposition, then whiteness is maintained, but biodegradability is compromised
Solution Approach 1:
The patent carefully controls the molecular structure parameters of the resorcinol-based dispersants, specifically limiting alkyl chain lengths and using natural substituent groups. These parameter constraints ensure the molecules remain small enough and structurally simple enough to be readily biodegraded by microorganisms while maintaining sufficient dispersant functionality
Solution Approach 2:
The dispersant molecules are designed with a functional philosophy akin to disposable components - they perform their redeposition-prevention function during the wash cycle and then are easily broken down and eliminated through biodegradation, preventing environmental accumulation. This approach prioritizes temporary effectiveness with complete environmental breakdown
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 use of ASR dispersants in laundry detergents significantly reduces soil redeposition, improving the whiteness and brightness of garments, as demonstrated by the ΔL value in reflectometry measurements, while being biodegradable and environmentally friendly.
Implementation Method 1
selected alkoxylated substituted Resorcinol (ASR) dispersants when incorporated into laundry detergents enhance whiteness and brightness of garments during domestic laundering
Implementation Method 2
The laundry detergent composition comprises: (i) from 0.5 to 20 wt%, preferably 1 to 10 wt%, most preferably 2 to 6 wt%, of an alkoxylated substituted resorcinol dispersant
Implementation Method 3
1 ppb to 5 ppm of fluorescent agent
Implementation Method 4
1 ppb to 1 ppm of shading dye
Data Source
AI summary
A laundry detergent comprising: (i) 0.5-20wt% of alkoxylated substituted resorcinol dispersant: (I), X is independently: ethoxy; mixtures of ethoxy and propoxy groups, where the number of EO > PO, wherein a+b=n and n=5-40; R2, R3 are independently: H, C1-C3 linear or branched alkyl aryl and aryl groups wherein R2 and/or R3 are from C1-C3 linear or branched alkyl aryl and aryl groups; T is: H; CH3; SO3 -; CH2COO-; PO3 2-; C2 H5; n-propyl, i-propyl; n- butyl; t-butyl; sulfosuccinate; (ii) 0-50wt% surfactant; (iii) 0.001-3wt% perfume; 0.0001-0.5wt% fluorescent agent and/or 0.0001-0. lwt% shading dye. Method of treating textiles with aqueous solution comprising 10-5000 ppm (i); 0-6g/L surfactant (ii); 0.1-100 ppm perfume, 1 ppb to 5 ppm fluorescent agent, and/or 1 ppb to 1 ppm shading dye.