Covalently Modified Microcapsules for Laundry Fragrance Substantivity
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Solution Overview
Problem
Microcapsules often lack substantivity and dispersibility in aqueous liquids, and existing methods for anchoring modifiers to the capsule surface are not universally effective, particularly affecting fragrance release in laundry applications.
Innovation Solution
A method of covalently bonding a modifier to a polymeric microcapsule wall using a linking compound with a specific formula, allowing for enhanced attachment to substrates through acrylic moieties, such as polysaccharides like hydroxypropylcellulose, by adding the linking compound to a capsule slurry followed by the modifier and an initiator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a modifier is added to provide dispersibility and substantivity to microcapsules, then dispersibility and substrate attachment improve, but the connection becomes an equilibrium with modifier molecules coming on and off the capsules
Solution Approach 1:
The patent creates a composite structure by covalently bonding the modifier to the capsule wall through a linking compound. This forms a stable composite material where the modifier is permanently attached via covalent bonds, eliminating the equilibrium detachment issue while maintaining dispersibility and substantivity functions.
Solution Approach 2:
The linking compound acts as an intermediary between the capsule wall and the modifier. It provides reactive groups that form covalent bonds with both the capsule wall and the modifier, creating a stable bridge that ensures permanent attachment while allowing the modifier to perform its dispersibility and substantivity functions.
2Adaptability or versatility
If modifiers are added to provide both dispersibility and substrate attachment, then capsule performance improves, but finding a material with affinity for both capsule and substrate becomes difficult
Solution Approach 1:
The patent segments the modifier attachment system into three distinct components: the capsule wall, the linking compound, and the modifier. This segmentation allows each component to be optimized independently - the capsule wall provides structural integrity, the linking compound provides covalent bonding capability, and the modifier provides dispersibility and substrate affinity, making the overall system easier to manufacture and adapt.
Solution Approach 2:
The linking compound serves multiple functions: it provides covalent bonding to the capsule wall, maintains structural integrity, and enables the modifier to attach permanently. This multi-functionality simplifies the selection process by providing a universal platform that works with various capsule and modifier combinations.
3Reliability
If modifiers are added during capsule wall formation to anchor them through entanglement, then some capsules show improved substantivity, but not all cases are successful and perfume components may interact with modifiers altering hedonic effect
Solution Approach 1:
The patent performs preliminary action by first forming the capsule wall with appropriate reactive groups, then subsequently attaching the linking compound and modifier in a controlled sequence. This stepwise approach ensures consistent results by allowing each component to be optimized and attached under controlled conditions, avoiding the variability of simultaneous entanglement during wall formation.
Solution Approach 2:
The linking compound acts as an intermediary that prevents direct interaction between the modifier and perfume components. By positioning the linking compound between the modifier and the encapsulated fragrance, it eliminates unwanted interactions that could alter the hedonic effect, while still providing strong covalent attachment to ensure substantivity.
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 modified microcapsules exhibit improved substantivity and dispersibility, ensuring greater adherence to substrates and enhanced fragrance release, as demonstrated by higher olfactory performance in laundry tests.
Implementation Method 1
A method of covalently bonding a modifier to a polymeric microcapsule wall, which wall comprises entities capable of reaction with acrylic moieties
Implementation Method 2
comprising the provision on the wall of a linking compound to which the modifier is subsequently attached
Data Source
AI summary
A method of covalently bonding a modifier to a polymeric microcapsule wall, which wall comprises entities capable of reaction with acrylic moieties, comprising the provision on the wall of a linking compound to which the modifier is subsequently attached, the linking compound having the Formula Iin whichn=1 to 30; R1, R2 and R3 are independently selected from the following moieties:R1 and R3 are H and Me; andX is selected from O and NH; andR2 is selected from CH2, CH2CH(OH)CH2, and CH2·CH2.Microcapsules thus modified exhibit enhanced substantivity to substrates such as textiles when used in laundry preparations.