Polysaccharide-containing sunscreen composition with a reduced likelihood of discolouring textiles
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Solution Overview
Problem
Cosmetic preparations containing non-water-soluble UV filters, such as bis-ethylhexyloxyphenol methoxyphenyl triazine, 4-(tert-butyl)-4'-methoxydibenzoylmethane, and Diethylamino Hydroxybenzoyl Hexyl Benzoate, cause difficult-to-remove stains and discoloration on textiles, especially on light-colored fabrics, and worsen during washing due to interactions with ions in the water.
Innovation Solution
Incorporating polysaccharides like carrageenan, welan gum, sclerotium gum, cellulose gum, sodium alginate, and carboxymethyl cellulose into cosmetic preparations to reduce textile contamination and discoloration by bis-ethylhexyloxyphenol methoxyphenyl triazine, facilitating easier washout of UV filters from textiles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If non-water-soluble UV filters are used in cosmetic preparations, then sun protection effectiveness is improved, but textile staining and discoloration worsens
Solution Approach 1:
The patent introduces polysaccharides (carboxymethyl cellulose, hydroxyethyl cellulose, or hydroxypropyl cellulose) as intermediary substances that form a complex with the UV filter bis-ethylhexyloxyphenol methoxyphenyl triazine. This complex has improved water solubility and reduced affinity for textile fibers, thereby preventing staining while maintaining UV protection. The polysaccharide acts as a mediator between the UV filter and the environment, modifying its interaction properties without compromising its protective function.
Solution Approach 2:
The patent modifies the solubility parameter of the UV filter by forming a complex with polysaccharides. The complexation changes the physical-chemical properties of the UV filter, specifically improving water solubility and reducing lipophilicity, which are the key parameters causing textile staining. This parameter change allows the UV filter to maintain effectiveness while reducing harmful staining effects.
2Ease of manufacture
If conventional detergents are used to wash textiles, then general cleaning is achieved, but UV filter stains become more entrenched due to ion interactions
Solution Approach 1:
The patent applies preliminary action by pre-complexing the UV filter with polysaccharides before it can interact with textile fibers. This preliminary complexation prevents the UV filter from binding strongly to textile fibers in the first place, making subsequent washing much easier. The polysaccharide-UV filter complex is already prepared in a state that minimizes fiber interaction, preventing the need for difficult stain removal later.
Solution Approach 2:
The patent converts the harmful lipophilic nature of the UV filter into a benefit by utilizing the polysaccharide's ability to form soluble complexes. The polysaccharide essentially 'disguises' the hydrophobic UV filter as a hydrophilic complex, allowing it to be washed away with water-soluble detergents rather than becoming entrenched through ion interactions.
3Ease of operation
If polysaccharides are added to cosmetic preparations, then textile washability is improved, but formulation complexity increases
Solution Approach 1:
The patent achieves universality by selecting polysaccharides that serve multiple functions: they act as solubility enhancers, staining preventatives, and formulation stabilizers. Carboxymethyl cellulose, hydroxyethyl cellulose, and hydroxypropyl cellulose can be used across different cosmetic preparation types (lotions, creams, gels) with various UV filter combinations, reducing the need for separate formulations for different applications.
Solution Approach 2:
The patent creates a composite material system where the polysaccharide and UV filter form a unified complex with synergistic properties. This composite approach allows the combination to achieve properties (water solubility, staining resistance) that neither component possesses alone, while maintaining a relatively simple overall formulation structure.
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 use of polysaccharides significantly reduces the staining and discoloration caused by UV filters on textiles, making it easier to wash out these contaminants, as demonstrated by in vitro studies showing a substantial reduction in yellow staining and improved washability.
Implementation Method 1
cosmetic preparations containing 2,4-bis-{[4-(2-ethyl-hexyloxy)-2-hydroxy]-phenyl}-6-(4-methoxyphenyl)-1,3,5-triazine in combination with one or more polysaccharides from the group consisting of carboxymethyl cellulose, hydroxyethyl cellulose and hydroxypropyl cellulose
Implementation Method 2
the contamination and/or discoloration of textiles caused by the UV filters in the preparation
Data Source
AI summary
Use of carrageenan in 2,4-bis-{[4-(2-ethyl-hexyloxy)-2-hydroxy]-phenyl}-6-(4-methoxyphenyl)-1,3,5-triazine (INCI: bis- Ethylhexyloxyphenol methoxyphenyl triazine)-containing cosmetic preparations for reducing the contamination and/or discoloration of textiles caused by the UV filters in the preparation.