Leuco Compound Stabilization via Antioxidant Ratios
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Solution Overview
Problem
Traditional leuco colorants used in textile laundering face challenges in controlling the conversion to their colored form during storage, as they tend to react prematurely, leading to undesirable color changes before use, and existing antioxidants are not effective in stabilizing compositions containing high levels of leuco compounds.
Innovation Solution
A composition comprising a leuco compound and a stabilizing amount of antioxidants, including sterically hindered phenols and substituted diarylamines, where the mole ratio of hindered phenol to substituted diarylamine is greater than 1:1, and the combined mass of leuco compounds and antioxidants is 10% or more of the total mass, effectively suppressing the conversion to the colored form during storage while allowing the desired color change upon use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional antioxidants are used at typical use levels (less than or about 1 wt. %), then the formulation is simple and cost-effective, but they are not effective in stabilizing compositions containing more than 2 wt. % leuco compounds
Solution Approach 1:
The patent changes the concentration parameter of antioxidants from typical use levels (less than 1 wt. %) to higher loading amounts (greater than 1 wt. %, and in some embodiments greater than 2 wt. %). This parameter change enables effective stabilization of compositions containing more than 2 wt. % leuco compounds, directly resolving the contradiction between reliability and quantity of substance.
2Stability of the object's composition
If higher loading of antioxidant is used, then the conversion of leuco compounds to colored form during storage is minimized, but the cost and complexity of formulation increases
Solution Approach 1:
The patent employs a composite antioxidant system combining multiple types of antioxidants (hindered phenols, substituted diarylamines, and other complementary antioxidants) in specific ratios. This composite approach provides synergistic stabilization effects, preventing premature color conversion while managing formulation complexity through structured combination of proven antioxidant classes.
Solution Approach 2:
The patent specifies particular concentration ranges and ratio parameters for different antioxidant types (e.g., hindered phenol at 0.01-5 wt. %, substituted diarylamine at 0.01-5 wt. %, with specific mole ratios). These parameter specifications optimize stabilization performance while controlling formulation complexity through defined compositional boundaries.
3Reliability
If leuco compounds are used to maintain colorless form on storage and undergo triggered change during use, then whiteness enhancement is achieved, but it is difficult to control the reaction timing
Solution Approach 1:
The patent applies preliminary anti-action by incorporating antioxidants into the formulation before use to prevent premature oxidation and color development of leuco compounds during storage. The antioxidants create a protective environment that suppresses unwanted reactions, allowing controlled timing of the color change to occur only when triggered during actual use.
Solution Approach 2:
The antioxidants serve as intermediary substances that mediate between the leuco compounds and oxygen, preventing direct oxidation during storage. These intermediaries scavenge free radicals and inhibit the oxidation pathway, thereby controlling when the leuco compounds convert to their colored form and eliminating premature color development.
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 solution significantly reduces the conversion of leuco compounds to their colored form during storage, maintaining the whiteness or hue of textile articles and ensuring the desired color change occurs only upon use, thereby enhancing the visual appearance and longevity of textiles.
Implementation Method 1
the conversion of leuco compounds to their colored or much more highly colored states during storage
Data Source
AI summary
A composition comprising: (a) a leuco composition; and (b) a stabilizing amount of an antioxidant composition. The antioxidant composition comprises at least one sterically hindered phenol and at least one substituted diarylamine, and the mole ratio of the hindered phenol to the substituted diarylamine is greater than 1:1. In another embodiment, a composition comprises (a) a leuco composition and (b) an antioxidant composition; and optionally (c) a solvent composition. The combined mass of the leuco compounds and antioxidants present in the composition is 10% or more of the total mass of the composition, and (b) the molar ratio of antioxidants present in the composition to leuco compounds present in the composition is greater than 1:1.