Acrylate Shell Encapsulates for High-Acid Perfume Stability
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Solution Overview
Problem
Existing perfume encapsulates in consumer products face instability due to perfume compounds like aldehydes and esters, which can form carboxylic acids, leading to capsule leakage and reduced performance.
Innovation Solution
The use of acrylate materials in the shell of the encapsulates, which allows for the encapsulation of perfumes with higher acid values (greater than 5.0 mg KOH/g) while maintaining low leakage rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If perfume compounds containing aldehydes, acetals, and esters are used to provide desirable scent experience, then the scent quality and consumer appeal are improved, but the capsule stability deteriorates due to acid formation leading to leakage
Solution Approach 1:
The patent introduces an intermediary substance - a polymer shell - that mediates between the perfume core and the external environment. This shell acts as a protective barrier that prevents direct contact between the perfume compounds (aldehydes, acetals, esters) and factors that would cause acid formation, thereby maintaining capsule stability while allowing the desirable scent experience to be delivered when the shell ruptures.
Solution Approach 2:
The patent changes the chemical parameters of the shell material by selecting specific polymers with controlled acid values (less than 5 mg KOH/g) and using cross-linking agents to modify the shell's chemical structure. This parameter change enables the shell to resist degradation from acid-forming perfume compounds while maintaining its protective function, thus resolving the contradiction between scent quality and capsule stability.
2Reliability
If the acid value of perfume is limited to no more than 5 mg KOH/g to prevent capsule degradation, then the capsule performance and leakage resistance are improved, but the fragrance formulation flexibility is reduced
Solution Approach 1:
The polymer shell serves as an intermediary that decouples the relationship between perfume acid value and capsule stability. By placing the perfume inside the shell, the system allows perfumes with higher acid values (greater than 5 mg KOH/g) to be encapsulated without causing capsule degradation, thus maintaining formulation flexibility while ensuring capsule performance through the protective barrier function of the shell.
Solution Approach 2:
The patent uses composite material structure - a core-shell encapsulate where the shell is formed from specific polymers (with controlled acid values) and cross-linked to create a stable matrix. This composite structure allows the inner perfume core to have higher acid values without compromising the outer shell's integrity, thereby maintaining both capsule performance and fragrance formulation flexibility.
3Reliability
If cross-linking agents are added to the shell formulation to improve capsule stability, then the leakage resistance is improved, but the shell material complexity and manufacturing difficulty increase
Solution Approach 1:
The patent changes the chemical parameters of the shell material by incorporating cross-linking agents that form a three-dimensional network structure. This parameter change increases the shell's leakage resistance by creating a more stable and less permeable matrix, while the cross-linking process is integrated into the existing encapsulation manufacturing process, minimizing additional complexity.
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 acrylate-based encapsulates provide improved stability and reduced leakage of perfumes, even when containing compounds prone to acid formation, thereby enhancing the freshness and performance of consumer products.
Implementation Method 1
Core-shell encapsulation, where the perfume is encapsulated by a polymeric shell, is a technology that is commonly used in consumer products
Implementation Method 2
certain perfume compounds, such as those containing aldehyde, acetal, and/or ester functionality, may form carboxylic acids when in the presence of atmospheric oxygen
Implementation Method 3
certain perfume compounds, such as those containing aldehyde, acetal, and/or ester functionality, may form carboxylic acids when in the presence of atmospheric oxygen and/or by hydrolysis
Data Source
AI summary
Consumer product composition that includes encapsulates, the encapsulates having a core that includes perfume characterized by an acid value of greater than 5.0 mg KOH/g of perfume, the encapsulates also including a shell that includes a (meth) acrylate material. Methods of making and using such compositions.