Amphiphilic Polymeric Whitening Agents for Cellulosic Substrates
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Solution Overview
Problem
Cellulosic substrates tend to yellow over time due to exposure to light, air, and soiling, making it difficult to reverse this discoloration through normal laundering processes, and existing whitening agents may cause undesirable staining or lose effectiveness.
Innovation Solution
A nonionic amphiphilic polymeric dye with a chromophore constituent that emits or absorbs light in the blue, red, violet, or purple spectrum, specifically designed to neutralize yellowness in cellulosic substrates, which can be incorporated into laundry detergents and fabric softening compositions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional whitening agents are used to brighten cellulosic substrates, then the substrates appear brighter, but the agents cause undesirable staining of the substrates
Solution Approach 1:
The patent modifies the chemical parameters of whitening agents by incorporating specific chromophore structures (acridines, anthraquinones, azines, azos, benzodifuranes, benzodifuranones, carotenoids, coumarins, cyanines, diazahemicyanines, diphenylmethanes, formazans, hemicyanines, indigoids, methanes, naphthalimides, naphthoquinones, nitros, nitrosos, oxazines, phthalocyanines, pyrazoles, stilbenes, styryls, triarylmethanes, triphenylmethanes, xanthenes) with controlled molecular weights and functional groups. These parameter changes enable the agents to brighten cellulosic substrates without causing staining, resolving the technical contradiction between illumination intensity improvement and harmful staining effects.
2Illumination intensity
If existing whitening agents are applied to neutralize yellowness in aged cellulosic substrates, then some brightening effect is achieved, but the agents lose effectiveness over time or under certain conditions
Solution Approach 1:
The patent creates composite whitening agent formulations combining multiple chromophore types with complementary absorption spectra. This composite approach ensures comprehensive coverage of the yellow region (400-500 nm) while maintaining stability across various pH, temperature, and light conditions. The diverse chromophore composition provides redundancy and synergistic effects, ensuring consistent effectiveness over time and under different laundering conditions.
Solution Approach 2:
The patent designs chromophores with specific local chemical properties including particular functional groups, molecular weights, and structural features tailored for optimal interaction with cellulosic fibers. These localized quality adjustments ensure the whitening agents bind effectively to cellulosic substrates while resisting degradation, thereby maintaining reliable yellow neutralization performance across varying environmental conditions.
3Ease of manufacture
If normal laundering procedures are used on yellowed cellulosic substrates, then the substrates are cleaned, but the yellowness cannot be reversed
Solution Approach 1:
The patent incorporates whitening agents containing chromophores that proactively counteract yellowing during the laundering process itself, rather than requiring separate treatment steps. The chromophores are designed to bind to cellulosic substrates during normal washing and rinsing cycles, neutralizing yellowness as it develops. This preliminary action during routine laundering maintains substrate brightness without adding complex processing steps.
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 effectively brightens cellulosic substrates without causing staining, extending the life of textiles by neutralizing yellowness and maintaining performance across various conditions.
Implementation Method 1
emit light with wavelengths in the range of blue, red, violet, purple, or combinations thereof upon exposure to ultraviolet light (or, they absorb light to produce the same shades)
Implementation Method 2
Suitable chromophore components generally fluoresce blue, red, violet, or purple color when exposed to light
Data Source
AI summary
The present application relates to novel whitening agents for cellulosic substrates. The whitening agents are comprised of at least two constituents: at least one chromophore constituent and at least one polymeric constituent. Suitable chromophore components generally fluoresce blue, red, violet, or purple color when exposed to light, or they may absorb light to reflect these same shades. The whitening agents are further characterized by the polymeric component comprising at least two repeating glycerol units. This disclosure also relates to laundry care compositions including but not limited to liquid and/or powder laundry detergent formulations and rinse added fabric softening (RAFS) compositions that comprise such whitening