Substituted Cellulose Antiredeposition in Laundry Detergents
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Solution Overview
Problem
Conventional laundry detergent compositions experience redeposition of soil onto fabrics during washing, leading to greying, and have not significantly evolved in decades despite the introduction of various substituted celluloses.
Innovation Solution
A laundry treatment composition comprising substituted cellulose with a specific degree of substitution (DS) and degree of blockiness (DB), combined with a laundry adjunct ingredient, which provides enhanced antiredeposition performance while potentially using lower levels of substituted cellulose.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional substituted celluloses are used in laundry detergents, then the detergent can provide basic cleaning function, but soil redeposition occurs leading to greying of fabrics
Solution Approach 1:
The patent applies parameter changes by precisely controlling the degree of substitution (DS) and degree of blockiness (DB) of the substituted cellulose. Specifically, it uses substituted cellulose with DS of 0.01 to 0.99 and DB such that DS+DB≥1.00 or DB+2DS-DS²≥0.01, which fundamentally changes the molecular structure parameters to achieve superior antiredeposition performance while reducing soil greying effects
Solution Approach 2:
The patent employs composite materials by combining substituted cellulose with specific laundry adjunct ingredients in a formulated composition. This composite approach integrates the antiredeposition properties of substituted cellulose with complementary detergent ingredients to enhance overall cleaning performance and reduce soil redeposition effectively
2Reliability
If higher levels of substituted cellulose are used to improve antiredeposition effect, then soil redeposition is reduced, but the detergent formulation becomes more complex and potentially less effective in other areas
Solution Approach 1:
The patent optimizes the concentration parameter by specifying that the substituted cellulose is present at a level of 0.001% to 20% by weight, preferably 0.03% to 10%. This precise parameter control ensures effective antiredeposition performance while avoiding excessive formulation complexity and maintaining balance with other detergent components
Solution Approach 2:
The patent applies local quality by focusing the specialized substituted cellulose with specific DS and DB parameters at the critical point where soil redeposition occurs, rather than uniformly enhancing all detergent properties. This targeted approach improves antiredeposition effect without unnecessarily complicating the overall formulation
3Ease of manufacture
If conventional substituted celluloses are used, then the detergent formulation is simple and well-established, but the antiredeposition performance is insufficient leading to fabric greying
Solution Approach 1:
The patent maintains formulation simplicity while improving performance by focusing on precise parameter changes in the substituted cellulose (DS: 0.01 to 0.99, DB: DS+DB≥1.00 or DB+2DS-DS²≥0.01). This approach requires no fundamental reformulation but achieves superior antiredeposition effect through optimized molecular characteristics
Solution Approach 2:
The patent employs readily available substituted cellulose materials with controlled DS and DB parameters that can be produced through standard industrial processes. This allows the formulation to remain economically viable and manufacturable while achieving enhanced performance without requiring rare or complex materials
Data Source
AI summary
Laundry treatment composition comprising a substituted cellulose having a degree of substitution, DS, of from 0.01 to 0.99 and a specific degree of blockiness, DB, such that either DS+DB is of at least lor DB+2DS-DS2 is of at least 1.20, and a laundry adjunct ingredient.