Granular Laundry Detergent With Dual Optical Brighteners for Fabric Whiteness
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Solution Overview
Problem
Existing laundry detergents often require consumers to split their fabric laundry loads and use different detergents for optimal whiteness benefits on various fabric types, as optical brighteners provide benefits on certain fabrics but not others.
Innovation Solution
A granular laundry detergent composition comprising a first optical brightener with a stilbene functional group and an SO3 group, and a second optical brightener without these groups, in a weight ratio of 3:1 to 8:1, providing whiteness benefits across a range of fabric types without negatives.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single optical brightener is used in laundry detergent, then whiteness benefit is provided on certain fabric types, but whiteness negatives occur on other fabric types
Solution Approach 1:
The optical brightening function is segmented into two distinct brighteners with different chemical structures and fabric affinities. The first brightener (stilbene-based) targets synthetic fabrics while the second brightener (non-stilbene) targets natural fabrics, allowing each to specialize in specific fabric types without causing negatives on others.
Solution Approach 2:
The detergent formulation uses a composite optical brightening system combining two different brightener chemistries. This composite approach creates a synergistic effect where the combination of brighteners provides broad-spectrum whiteness enhancement across multiple fabric types, overcoming the limitations of single-brightener formulations.
2Adaptability or versatility
If consumers use different detergents for different fabric types, then optimal whiteness benefit is achieved on each fabric type, but laundry process complexity increases
Solution Approach 1:
The detergent formulation achieves multi-functionality by incorporating two optical brighteners that collectively address the needs of diverse fabric types. This universal formulation allows a single detergent to perform optimally on cotton, polycotton, polyester, and other fabrics, eliminating the need for consumers to sort laundry by fabric type or use multiple specialized detergents.
3Adaptability or versatility
If the weight ratio of first optical brightener to second optical brightener is outside the 3:1 to 8:1 range, then formulation flexibility increases, but whiteness benefit consistency decreases
Solution Approach 1:
The patent identifies and optimizes the critical parameter of brightener ratio to achieve consistent performance. By establishing the specific weight ratio range of 3:1 to 8:1 between the first and second optical brighteners, the formulation ensures reliable whiteness enhancement across different fabric types while maintaining formulation flexibility within this optimized range.
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 composition achieves consistent whiteness benefits across cotton, polycotton, and polyester fabrics, with optimal ratios showing positive delta WCIE values compared to single brightener use, indicating improved fabric appearance.
Implementation Method 1
Optical brighteners are known and have been added to laundry detergent compositions to provide whiteness benefits to fabrics
Data Source
AI summary
The present invention is to a granular laundry detergent composition including a first optical brightener and a second optical brightener. Also contemplated is a water-soluble unit dose article including the granular laundry detergent composition.