Distyryl-Biphenyl Optical Brighteners for Polyester Deposition
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Solution Overview
Problem
Commercially available optical brighteners fail to effectively deposit on polyester-based fabrics, resulting in no improvement in whiteness index when used in laundry care compositions.
Innovation Solution
Development of novel optical brighteners derived from distyryl-biphenyl compounds, specifically sulfonated and carboxylated derivatives, which are designed to improve deposition efficiency on various substrates, including polyester fabrics, through specific structural modifications and synthetic procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If commercially available optical brighteners are used, then the whiteness index of substrates can be improved, but they fail to effectively deposit on polyester-based fabrics
Solution Approach 1:
The patent modifies the chemical structure of optical brighteners by introducing specific substituent groups (Formula II-VII) with varying parameters such as alkyl chains, hydroxyl groups, and ether linkages. These parameter changes in molecular structure enable effective deposition on polyester fabrics while maintaining whiteness enhancement capabilities
Solution Approach 2:
The invention creates composite optical brightener molecules combining distyryl-biphenyl core structures with various functional substituents (Formula II-VII). This composite approach integrates the optical properties of the core with the deposition capabilities of the substituents, achieving both whiteness improvement and effective polyester coverage
2Reliability
If optical brighteners are designed with specific structural modifications for better deposition, then deposition efficiency improves, but the complexity of synthesis increases
Solution Approach 1:
The optical brightener molecules are segmented into distinct functional modules: a distyryl-biphenyl core (providing optical properties) and separate substituent groups (Formula II-VII, providing deposition properties). This segmentation allows independent optimization of each function and simplifies the synthetic approach by using modular assembly
Solution Approach 2:
The distyryl-biphenyl core structure serves as a universal platform that can accommodate multiple different substituent types (Formula II-VII). This universal core enables a single synthetic strategy to produce multiple brightener variants, each optimized for different substrates without requiring entirely new synthesis pathways
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 novel optical brighteners effectively enhance the whiteness index of fabrics by ensuring deposition on polyester-based materials, outperforming commercially available alternatives in terms of deposition efficiency and perceived whiteness.
Implementation Method 1
Optical brighteners are a class of fluorescent materials that absorb light in the ultraviolet regions of the electromagnetic spectrum (e.g., less than 400 nm) and re-emit light in the violet and blue regions of the electromagnetic spectrum (e.g., greater than 400 nm)
Data Source
AI summary
Novel compounds based on distyryl-biphenyl are provided. The compounds conform to the general structureThe compounds are useful as optical brighteners. Compositions, such as laundry care compositions, containing such compounds are also provided.