Non-ionic Polysaccharide Delivery Particles for Laundry Fragrance Retention
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Solution Overview
Problem
Existing surface treatment compositions face challenges in maintaining the longevity of perfume adherence on surfaces, particularly in surfactant-containing environments, as perfume can be washed off or leached from carriers, and existing deposition aids are not effective on both cotton and polyester substrates, nor stable against hydrolysis and enzyme attack.
Innovation Solution
The use of non-ionic, substituted cellulosic derivatives as deposition aids, forming particles with a benefit agent core and a water-insoluble shell, which are cross-linked to create stable, pseudo-hydrogen bond interactions with polyester, and attached to the shell to prevent removal in water, enhancing affinity to cotton and resistance to hydrolysis and enzyme attack.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If cellulose-substantive polysaccharides are used as deposition aids, then affinity to cotton substrate is improved, but stability against enzyme attack deteriorates
Solution Approach 1:
The patent uses composite particles comprising a benefit agent core, a water-insoluble shell, and cross-linked non-ionic polysaccharide deposition aids. This composite structure combines the cotton affinity of polysaccharides with the stability and polyester affinity provided by the water-insoluble shell and cross-linking, resolving the contradiction between substrate affinity and enzyme stability.
Solution Approach 2:
The patent modifies the polysaccharide deposition aids through cross-linking, which changes their chemical structure and properties. This cross-linking reduces enzyme accessibility and hydrolysis susceptibility while maintaining or enhancing substrate affinity, thus improving stability without sacrificing adaptability.
2Adaptability or versatility
If phthalate containing polymers are used as deposition aids, then affinity to polyester substrate is improved, but stability against hydrolysis deteriorates
Solution Approach 1:
The patent creates composite particles with a water-insoluble shell that provides polyester affinity through phthalate groups, while the cross-linked non-ionic polysaccharide deposition aids provide structural stability and resistance to hydrolysis. This composite approach allows both functions to coexist without compromising either affinity or stability.
Solution Approach 2:
The patent modifies the deposition aid structure by introducing cross-linking and using water-insoluble shells, which changes the chemical environment and protects against hydrolysis while maintaining polyester affinity through specific functional groups.
3Ease of operation
If perfume is deposited onto fabric surface, then fragrance application is improved, but longevity of adherence deteriorates
Solution Approach 1:
The patent uses a core-shell structure where the benefit agent (perfume) is encapsulated within a water-insoluble shell that is further decorated with cross-linked non-ionic polysaccharide deposition aids. This nested structure protects the perfume from premature release and environmental degradation, significantly extending its longevity while maintaining ease of application.
Solution Approach 2:
The water-insoluble shell acts as a protective barrier that controls the release of the perfume benefit agent. This shell structure prevents premature leaching into water while allowing controlled release during use, thereby extending the duration of adherence without compromising application ease.
4Reliability
If non-ionic polysaccharides are cross-linked to form water-insoluble shell, then stability against hydrolysis and enzyme attack is improved, but device complexity increases
Solution Approach 1:
The patent divides the particle into distinct functional segments: a benefit agent core, a water-insoluble shell, and cross-linked non-ionic polysaccharide deposition aids on the surface. This segmentation allows each component to perform its specific function independently, simplifying the overall design while achieving high stability against hydrolysis and enzyme attack.
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 provides effective deposition and retention of benefit agents on both cotton and polyester surfaces, offering improved soil release benefits and stability against hydrolysis and enzyme attack, ensuring prolonged fragrance and performance in laundry and skin/hair treatments.
Implementation Method 1
cross-linked to create stable, pseudo-hydrogen bond interactions with polyester
Implementation Method 2
attached to the shell to prevent removal in water
Data Source
AI summary
The invention provides a composition comprising a benefit agent delivery particle comprising at least one of hydroxylpropyl methyl cellulose, hydroxylethyl methyl cellulose, hydroxylpropyl guar, hydroxylethyl ethyl cellulose or methyl cellulose. The benefit agent delivery particle may further comprise a non-polysaccharide polymer, preferably an aminoplast polymer. The benefit agent delivery particle may comprise a perfume. The invention also provides a process for the manufacture of the particles in which perfume oil is encapsulated using emulsion polymerization to form core-shell particles, (in the alternative the perfume may be adsorbed later) and, a further polymer layer is formed on the outer surface of the core shell-particles in the presence of the delivery aid.