Microcapsule Composition Stabilization Using Viscosity Control Agents
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Solution Overview
Problem
Conventional microcapsule compositions face stability issues such as short storage lifetime, gel formation during transportation, and instability in consumer products, leading to premature release of active materials.
Innovation Solution
Incorporating viscosity control agents like acrylate copolymers, cationic acrylamide copolymers, or polysaccharides into microcapsule compositions to stabilize the microcapsules, maintaining their integrity and preventing gel formation and water separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional microcapsule compositions are used, then the microcapsules can deliver active materials, but they form gel and separate into layers during storage and transportation
Solution Approach 1:
The patent introduces a viscosity control agent as an intermediary substance between the microcapsules and aqueous phase. This agent mediates the interaction by controlling the rheological properties of the composition, preventing direct harmful interactions that lead to gel formation and layer separation. The viscosity control agent acts as a buffer that stabilizes the system without requiring modification of the microcapsule structure itself.
Solution Approach 2:
The patent applies parameter changes by adjusting the viscosity of the microcapsule composition through the addition of viscosity control agents. By changing the viscosity parameter of the continuous phase, the patent prevents the composition from entering a gel state and maintains stable dispersion of microcapsules during storage and transportation, thereby eliminating gel formation and layer separation.
2Duration of action of stationary object
If the microcapsule storage lifetime is extended, then the shelf life improves, but the composition becomes unstable in consumer products
Solution Approach 1:
The viscosity control agent serves multiple functions simultaneously: it extends the storage lifetime of microcapsules by preventing aggregation and maintains composition stability in consumer products by controlling rheological properties. This multi-functional approach allows the same additive to address both extended shelf life and product stability requirements without requiring separate stabilization systems.
3Strength
If a robust microcapsule wall is engineered to improve stability, then the microcapsule strength increases, but gel formation occurs during transportation in harsh temperature
Solution Approach 1:
The patent extracts the stability function from the microcapsule wall structure and transfers it to the continuous phase through the addition of viscosity control agents. By taking out the stabilization responsibility from the microcapsule wall, the patent allows the wall to focus on providing mechanical strength and protection, while the viscosity control agent independently prevents gel formation during transportation, even under harsh temperature conditions.
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 microcapsule compositions remain stable for extended periods, maintaining a viscosity below 3000 cP and minimal water separation, ensuring prolonged shelf life and suitability for consumer products.
Implementation Method 1
a viscosity control agent, in which the viscosity control agent is an acrylate copolymer, a cationic acrylamide copolymer, or a polysaccharide
Data Source
AI summary
Disclosed are microcapsule compositions each comprising a microcapsule suspended in an aqueous phase and a viscosity control agent, wherein the viscosity control agent is an acrylate copolymer, a cationic acrylamide copolymer, or a polysaccharide. Also disclosed are consumer products containing such a microcapsule composition.