Antiredeposition agent and detergent composition
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Solution Overview
Problem
Conventional detergent compositions, particularly those using polyaspartate salts, lack effective antiredeposition ability, and existing technologies do not adequately focus on the molecular weight ratio (polydispersity) of these salts, which is crucial for preventing dirt redeposition during washing.
Innovation Solution
A detergent composition incorporating a polyaspartic acid alkali metal salt with a weight-average molecular weight to number-average molecular weight ratio (Mw/Mn) of 1.4 or more, specifically lithium polyaspartate, potassium polyaspartate, or sodium polyaspartate, to enhance antiredeposition performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional polyaspartate salt is used, then environmental compatibility is improved, but antiredeposition performance deteriorates
Solution Approach 1:
The patent applies parameter changes by controlling the polydispersity index (Mw/Mn) of polyaspartate salt to be 1.05 or more. This specific parameter adjustment enables the substance to simultaneously achieve environmental compatibility (as polyaspartate salt is biodegradable) and effective antiredeposition performance, resolving the contradiction between environmental friendliness and functional effectiveness.
2Ease of manufacture
If polyaspartate salt with low polydispersity is used, then manufacturing simplicity is improved, but antiredeposition ability deteriorates
Solution Approach 1:
The patent identifies and controls a specific manufacturing parameter - the polydispersity index (Mw/Mn) - to be 1.05 or more. This parameter control provides a clear manufacturing target that guides the production process, transforming polyaspartate salt into an effective antiredeposition agent. The parameter specification enables manufacturers to achieve both functional performance and manufacturing feasibility.
Data Source
AI summary
An antiredeposition agent includes a polyaspartic acid alkali metal having a polydispersity, represented by the ratio (Mw/Mn) of the weight-average molecular weight (Mw) to the number-average molecular weight (Mn), of 1.4 or more and being selected from the group consisting of lithium polyaspartate, potassium polyaspartate, and sodium polyaspartate.