Laundry Detergent Microcapsule Phase Stability via Distyrylbiphenyl Brightener
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Solution Overview
Problem
Liquid laundry detergent compositions with cationically charged microcapsules face phase instability and compatibility issues, particularly at pilot scale, due to interactions with other ingredients, leading to reduced efficacy and delivery efficiency of fabric care agents.
Innovation Solution
Incorporating a distyrylbiphenyl-based fluorescent brightener, such as Fluorescent Brightener 49, in combination with cationically charged microcapsules, which enhances deposition onto fabrics and stabilizes the composition at near neutral pH, minimizing the use of hydrotropes and preventing negative interactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If cationically charged coating is applied to microcapsules to enhance deposition onto fabrics, then delivery efficiency of fabric care agents is improved, but phase stability of the composition deteriorates due to interactions with other ingredients
Solution Approach 1:
The patent changes the chemical parameters of the fluorescent brightener by selecting a distyrylbiphenyl-based compound with specific molecular structure and charge characteristics. This parameter change allows the brightener to be compatible with cationically charged microcapsules, resolving the phase instability issue while maintaining delivery efficiency
Solution Approach 2:
The patent creates a composite formulation by carefully selecting and combining specific ingredients: distyrylbiphenyl-based fluorescent brightener, cationically charged microcapsules, and anionic surfactants. This composite approach ensures compatibility between components with opposite charges, achieving both phase stability and enhanced deposition
2Reliability
If cationically charged microcapsules are used to improve deposition onto negatively charged fabrics, then fabric care benefits are enhanced, but compatibility with other detergent ingredients deteriorates
Solution Approach 1:
The patent modifies the charge interaction parameters by selecting a distyrylbiphenyl-based fluorescent brightener with appropriate charge characteristics that is compatible with cationically charged microcapsules. This prevents unwanted interactions and maintains ingredient compatibility throughout the formulation
Solution Approach 2:
The patent uses the distyrylbiphenyl-based fluorescent brightener as an intermediary component that bridges the compatibility gap between cationically charged microcapsules and other anionic ingredients in the detergent formulation, preventing harmful interactions
3Ease of operation
If composition is formulated at near neutral pH for hand mildness benefits, then user comfort is improved, but phase stability becomes more difficult to maintain
Solution Approach 1:
The patent optimizes the pH parameter to a near neutral range (pH 7-8) and maintains phase stability through the careful selection of distyrylbiphenyl-based fluorescent brightener and cationically charged microcapsules that are compatible at this pH level, unlike conventional formulations that require higher pH for stability
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 achieves phase stability and improved delivery efficiency of microcapsules, ensuring effective brightening and fabric care benefits while maintaining composition stability under rigorous processing conditions.
Implementation Method 1
a coating coating said outer surface, wherein said coating is cationically charged... enhances the deposition of the microcapsules onto fabrics, particularly onto negatively charged fabrics
Implementation Method 2
The use of optical brighteners, also known as fluorescent whitening agents, have long be used in fabric care products to compensate for the yellow tint of fibers be adding blue fluorescence to the light reflected by the fabric
Data Source
AI summary
Liquid laundry detergent compositions containing a microcapsule with a cationically charged coating and a fluorescent brightener with a distyrylbiphenyl unit, preferably Fluorescent Brightener-49, are provided. The compositions provide improved delivery efficiency of microcapsules and brightening of fabric whilst minimizing phase stability issues.