Leuco Polymer Bluing Agents for Laundry Care
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Solution Overview
Problem
Traditional whitening agents for textiles often adversely impact aesthetics or cause build-up over time, failing to effectively maintain whiteness and prevent yellowing in aged textiles.
Innovation Solution
A laundry care composition containing leuco polymers, specifically a carbohydrate polymer with a leuco moiety covalently bound, which changes color upon exposure to triggers like oxygen or light, enhancing whiteness without aesthetic issues or build-up.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If traditional whitening agents are used to enhance whiteness, then the perceived whiteness of textiles is improved, but aesthetic quality deteriorates due to adverse impacts or build-up over time
Solution Approach 1:
The patent applies parameter changes by using leuco polymers that exist in a colorless state during storage and application, then transform to a colored state (typically blue) upon exposure to oxygen or other triggers during laundering. This reversible transformation allows the same substance to provide whiteness enhancement without the persistent aesthetic degradation caused by traditional whitening agents. The key parameter change is the oxidation state of the leuco polymer, which switches between colorless and colored forms.
2Illumination intensity
If highly depositing whitening agents are used to provide whiteness benefit, then the whiteness enhancement is improved, but build-up occurs over multiple washes
Solution Approach 1:
The patent implements dynamics by creating a whitening agent that is dynamic in its color expression rather than static. The leuco polymer dynamically transforms from colorless to colored and back again based on environmental conditions (oxygen exposure, pH, temperature). This dynamic behavior allows the substance to provide whiteness enhancement only when needed (during laundering) without accumulating permanently on the fabric, thus avoiding build-up issues associated with traditional static whitening agents.
3Reliability
If leuco polymers are used to enhance whiteness, then aesthetic quality is maintained, but the mechanism requires transformation upon exposure to triggers
Solution Approach 1:
The patent applies self-service by designing the leuco polymer to automatically transform in response to environmental triggers present during normal laundering conditions. The polymer self-activates upon exposure to oxygen, pH changes, or temperature variations without requiring external control systems, complex activation mechanisms, or additional chemical additives. This self-service transformation simplifies the overall system while maintaining aesthetic quality.
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 leuco polymer composition effectively enhances the perceived whiteness of textiles, counteracting fading and yellowing without adverse effects on aesthetics or causing build-up, providing a stable and visually appealing solution.
Implementation Method 1
The change in coloration that occurs is typically visually perceptible to the human eye... upon exposure to oxygen, ion addition, and exposure to light
Implementation Method 2
The change in coloration that occurs is typically visually perceptible to the human eye... upon exposure to oxygen, ion addition, and exposure to light
Data Source
AI summary
A laundry care composition including at least one laundry care ingredient and at least one leuco polymer including a polymeric carbohydrate and a leuco moiety. The polymeric carbohydrate and the leuco moiety are covalently bound. Methods of making the leuco polymer, laundry care compositions comprising the leuco polymer and methods of treating textiles with such laundry care compositions.