Liquid Laundry Detergent Composition for Low Dioxane Sebum Cleaning
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Solution Overview
Problem
Existing fabric detergent compositions using alkyl glycol sulfate anionic surfactants are less effective at removing sebum stains, and reducing 1,4-dioxane levels remains a challenge despite advancements in processing techniques.
Innovation Solution
A liquid laundry detergent composition comprising a surfactant system with a specific ratio of alkyl glycol sulfate anionic surfactant and sulfonate anionic surfactant, optimized to improve cleaning efficacy, especially for sebum stains, while minimizing 1,4-dioxane levels through controlled synthesis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If alkyl glycol sulfate anionic surfactant is used to reduce 1,4-dioxane levels, then 1,4-dioxane levels are reduced, but cleaning performance on sebum stains deteriorates
Solution Approach 1:
The patent combines alkyl glycol sulfate anionic surfactant and sulfonate anionic surfactant in a specific ratio (1:4 to 4:1) to create a synergistic surfactant system. This merging of two different surfactant types resolves the contradiction by maintaining the low 1,4-dioxane benefit of alkyl glycol sulfate while compensating for its poor sebum stain removal through the addition of sulfonate surfactant, which excels at removing oily stains.
Solution Approach 2:
The patent changes the compositional parameters of the surfactant system by specifying optimal concentration ranges for each component (alkyl glycol sulfate: 0.1-20 wt%, sulfonate: 0.1-40 wt%). By adjusting these parameters within defined ranges, the formulation achieves both low 1,4-doxane levels and improved sebum stain removal performance.
2Reliability
If alkyl ether sulfate anionic surfactant is used to improve cleaning performance, then cleaning performance is improved, but 1,4-dioxane by-product formation increases
Solution Approach 1:
The patent extracts or removes the ethoxylated intermediate step from the traditional alkyl ether sulfate synthesis pathway. Instead of reacting alkyl alcohol with ethylene oxide to form alkyl ether sulfate, the invention uses alkyl glycol sulfate which is synthesized without this intermediate step, thereby eliminating the source of 1,4-dioxane by-product formation while maintaining effective surfactant functionality.
Solution Approach 2:
The patent replaces the conventional alkyl ether sulfate surfactant (which produces persistent 1,4-doxane by-products) with alkyl glycol sulfate surfactant. This substitution uses a different chemical pathway that does not generate the harmful by-product, effectively replacing a problematic material with a cleaner alternative that achieves the same cleaning function without the harmful side effects.
Data Source
AI summary
The need for liquid laundry detergent compositions which comprise very low levels or even no dioxane, while also providing improved removal of sebum and other stains, is met by formulating the detergent composition using alkyl glycol sulfate anionic surfactant having a high fraction of the alkyl glycol sulfate anionic surfactant with a longer alkyl chain length.